Pileus Git - ~andy/gtk/blob - gtk/gtkdnd.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 1995-1999 Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GTK+ Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #include "config.h"
  28
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 #include "gdkconfig.h"
  33
  34 #include "gdk/gdkkeysyms.h"
  35
  36 #ifdef GDK_WINDOWING_X11
  37 #include <X11/Xlib.h>
  38 #include <X11/keysym.h>
  39 #include "gdk/x11/gdkx.h"
  40 #endif
  41
  42 #include "gtkdnd.h"
  43 #include "gtkiconfactory.h"
  44 #include "gtkicontheme.h"
  45 #include "gtkimage.h"
  46 #include "gtkinvisible.h"
  47 #include "gtkmain.h"
  48 #include "gtkplug.h"
  49 #include "gtkstock.h"
  50 #include "gtkwindow.h"
  51 #include "gtkintl.h"
  52 #include "gtkdndcursors.h"
  53 #include "gtkalias.h"
  54
  55 static GSList *source_widgets = NULL;
  56
  57 typedef struct _GtkDragSourceSite GtkDragSourceSite;
  58 typedef struct _GtkDragSourceInfo GtkDragSourceInfo;
  59 typedef struct _GtkDragDestSite GtkDragDestSite;
  60 typedef struct _GtkDragDestInfo GtkDragDestInfo;
  61 typedef struct _GtkDragAnim GtkDragAnim;
  62 typedef struct _GtkDragFindData GtkDragFindData;
  63
  64
  65 typedef enum
  66 {
  67   GTK_DRAG_STATUS_DRAG,
  68   GTK_DRAG_STATUS_WAIT,
  69   GTK_DRAG_STATUS_DROP
  70 } GtkDragStatus;
  71
  72 struct _GtkDragSourceSite
  73 {
  74   GdkModifierType    start_button_mask;
  75   GtkTargetList     *target_list;        /* Targets for drag data */
  76   GdkDragAction      actions;            /* Possible actions */
  77
  78   /* Drag icon */
  79   GtkImageType icon_type;
  80   union
  81   {
  82     GtkImagePixmapData pixmap;
  83     GtkImagePixbufData pixbuf;
  84     GtkImageStockData stock;
  85     GtkImageIconNameData name;
  86   } icon_data;
  87   GdkBitmap *icon_mask;
  88
  89   GdkColormap       *colormap;           /* Colormap for drag icon */
  90
  91   /* Stored button press information to detect drag beginning */
  92   gint               state;
  93   gint               x, y;
  94 };
  95
  96 struct _GtkDragSourceInfo
  97 {
  98   GtkWidget         *widget;
  99   GtkTargetList     *target_list; /* Targets for drag data */
 100   GdkDragAction      possible_actions; /* Actions allowed by source */
 101   GdkDragContext    *context;     /* drag context */
 102   GtkWidget         *icon_window; /* Window for drag */
 103   GtkWidget         *fallback_icon; /* Window for drag used on other screens */
 104   GtkWidget         *ipc_widget;  /* GtkInvisible for grab, message passing */
 105   GdkCursor         *cursor;      /* Cursor for drag */
 106   gint hot_x, hot_y;              /* Hot spot for drag */
 107   gint button;                    /* mouse button starting drag */
 108
 109   GtkDragStatus      status;      /* drag status */
 110   GdkEvent          *last_event;  /* pending event */
 111
 112   gint               start_x, start_y; /* Initial position */
 113   gint               cur_x, cur_y;     /* Current Position */
 114   GdkScreen         *cur_screen;       /* Current screen for pointer */
 115
 116   guint32            grab_time;   /* timestamp for initial grab */
 117   GList             *selections;  /* selections we've claimed */
 118
 119   GtkDragDestInfo   *proxy_dest;  /* Set if this is a proxy drag */
 120
 121   guint              update_idle;      /* Idle function to update the drag */
 122   guint              drop_timeout;     /* Timeout for aborting drop */
 123   guint              destroy_icon : 1; /* If true, destroy icon_window
 124                                         */
 125   guint              have_grab : 1;    /* Do we still have the pointer grab
 126                                         */
 127   GdkPixbuf         *icon_pixbuf;
 128   GdkCursor         *drag_cursors[6];
 129 };
 130
 131 struct _GtkDragDestSite
 132 {
 133   GtkDestDefaults    flags;
 134   GtkTargetList     *target_list;
 135   GdkDragAction      actions;
 136   GdkWindow         *proxy_window;
 137   GdkDragProtocol    proxy_protocol;
 138   guint              do_proxy : 1;
 139   guint              proxy_coords : 1;
 140   guint              have_drag : 1;
 141   guint              track_motion : 1;
 142 };
 143
 144 struct _GtkDragDestInfo
 145 {
 146   GtkWidget         *widget;       /* Widget in which drag is in */
 147   GdkDragContext    *context;      /* Drag context */
 148   GtkDragSourceInfo *proxy_source; /* Set if this is a proxy drag */
 149   GtkSelectionData  *proxy_data;   /* Set while retrieving proxied data */
 150   guint              dropped : 1;     /* Set after we receive a drop */
 151   guint32            proxy_drop_time; /* Timestamp for proxied drop */
 152   guint              proxy_drop_wait : 1; /* Set if we are waiting for a
 153                                            * status reply before sending
 154                                            * a proxied drop on.
 155                                            */
 156   gint               drop_x, drop_y; /* Position of drop */
 157 };
 158
 159 #define DROP_ABORT_TIME 300000
 160
 161 #define ANIM_STEP_TIME 50
 162 #define ANIM_STEP_LENGTH 50
 163 #define ANIM_MIN_STEPS 5
 164 #define ANIM_MAX_STEPS 10
 165
 166 struct _GtkDragAnim
 167 {
 168   GtkDragSourceInfo *info;
 169   gint step;
 170   gint n_steps;
 171 };
 172
 173 struct _GtkDragFindData
 174 {
 175   gint x;
 176   gint y;
 177   GdkDragContext *context;
 178   GtkDragDestInfo *info;
 179   gboolean found;
 180   gboolean toplevel;
 181   gboolean (*callback) (GtkWidget *widget, GdkDragContext *context,
 182                         gint x, gint y, guint32 time);
 183   guint32 time;
 184 };
 185
 186 /* Enumeration for some targets we handle internally */
 187
 188 enum {
 189   TARGET_MOTIF_SUCCESS = 0x40000000,
 190   TARGET_MOTIF_FAILURE,
 191   TARGET_DELETE
 192 };
 193
 194 /* Drag icons */
 195
 196 static GdkPixmap   *default_icon_pixmap = NULL;
 197 static GdkPixmap   *default_icon_mask = NULL;
 198 static GdkColormap *default_icon_colormap = NULL;
 199 static gint         default_icon_hot_x;
 200 static gint         default_icon_hot_y;
 201
 202 /* Forward declarations */
 203 static void          gtk_drag_get_event_actions (GdkEvent        *event,
 204                                                  gint             button,
 205                                                  GdkDragAction    actions,
 206                                                  GdkDragAction   *suggested_action,
 207                                                  GdkDragAction   *possible_actions);
 208 static GdkCursor *   gtk_drag_get_cursor         (GdkDisplay     *display,
 209                                                   GdkDragAction   action,
 210                                                   GtkDragSourceInfo *info);
 211 static void          gtk_drag_update_cursor      (GtkDragSourceInfo *info);
 212 static GtkWidget    *gtk_drag_get_ipc_widget            (GtkWidget *widget);
 213 static GtkWidget    *gtk_drag_get_ipc_widget_for_screen (GdkScreen *screen);
 214 static void          gtk_drag_release_ipc_widget (GtkWidget      *widget);
 215
 216 static gboolean      gtk_drag_highlight_expose   (GtkWidget      *widget,
 217                                                   GdkEventExpose *event,
 218                                                   gpointer        data);
 219
 220 static void     gtk_drag_selection_received     (GtkWidget        *widget,
 221                                                  GtkSelectionData *selection_data,
 222                                                  guint             time,
 223                                                  gpointer          data);
 224 static void     gtk_drag_find_widget            (GtkWidget        *widget,
 225                                                  GtkDragFindData  *data);
 226 static void     gtk_drag_proxy_begin            (GtkWidget        *widget,
 227                                                  GtkDragDestInfo  *dest_info,
 228                                                  guint32           time);
 229 static void     gtk_drag_dest_realized          (GtkWidget        *widget);
 230 static void     gtk_drag_dest_hierarchy_changed (GtkWidget        *widget,
 231                                                  GtkWidget        *previous_toplevel);
 232 static void     gtk_drag_dest_site_destroy      (gpointer          data);
 233 static void     gtk_drag_dest_leave             (GtkWidget        *widget,
 234                                                  GdkDragContext   *context,
 235                                                  guint             time);
 236 static gboolean gtk_drag_dest_motion            (GtkWidget        *widget,
 237                                                  GdkDragContext   *context,
 238                                                  gint              x,
 239                                                  gint              y,
 240                                                  guint             time);
 241 static gboolean gtk_drag_dest_drop              (GtkWidget        *widget,
 242                                                  GdkDragContext   *context,
 243                                                  gint              x,
 244                                                  gint              y,
 245                                                  guint             time);
 246
 247 static GtkDragDestInfo *  gtk_drag_get_dest_info     (GdkDragContext *context,
 248                                                       gboolean        create);
 249 static GtkDragSourceInfo *gtk_drag_get_source_info   (GdkDragContext *context,
 250                                                       gboolean        create);
 251 static void               gtk_drag_clear_source_info (GdkDragContext *context);
 252
 253 static void gtk_drag_source_check_selection    (GtkDragSourceInfo *info,
 254                                                 GdkAtom            selection,
 255                                                 guint32            time);
 256 static void gtk_drag_source_release_selections (GtkDragSourceInfo *info,
 257                                                 guint32            time);
 258 static void gtk_drag_drop                      (GtkDragSourceInfo *info,
 259                                                 guint32            time);
 260 static void gtk_drag_drop_finished             (GtkDragSourceInfo *info,
 261                                                 GtkDragResult      result,
 262                                                 guint              time);
 263 static void gtk_drag_cancel                    (GtkDragSourceInfo *info,
 264                                                 GtkDragResult      result,
 265                                                 guint32            time);
 266
 267 static gboolean gtk_drag_source_event_cb       (GtkWidget         *widget,
 268                                                 GdkEvent          *event,
 269                                                 gpointer           data);
 270 static void gtk_drag_source_site_destroy       (gpointer           data);
 271 static void gtk_drag_selection_get             (GtkWidget         *widget,
 272                                                 GtkSelectionData  *selection_data,
 273                                                 guint              sel_info,
 274                                                 guint32            time,
 275                                                 gpointer           data);
 276 static gboolean gtk_drag_anim_timeout          (gpointer           data);
 277 static void gtk_drag_remove_icon               (GtkDragSourceInfo *info);
 278 static void gtk_drag_source_info_destroy       (GtkDragSourceInfo *info);
 279 static void gtk_drag_add_update_idle           (GtkDragSourceInfo *info);
 280
 281 static void gtk_drag_update                    (GtkDragSourceInfo *info,
 282                                                 GdkScreen         *screen,
 283                                                 gint               x_root,
 284                                                 gint               y_root,
 285                                                 GdkEvent          *event);
 286 static gboolean gtk_drag_motion_cb             (GtkWidget         *widget,
 287                                                 GdkEventMotion    *event,
 288                                                 gpointer           data);
 289 static gboolean gtk_drag_key_cb                (GtkWidget         *widget,
 290                                                 GdkEventKey       *event,
 291                                                 gpointer           data);
 292 static gboolean gtk_drag_grab_broken_event_cb  (GtkWidget          *widget,
 293                                                 GdkEventGrabBroken *event,
 294                                                 gpointer            data);
 295 static void     gtk_drag_grab_notify_cb        (GtkWidget         *widget,
 296                                                 gboolean           was_grabbed,
 297                                                 gpointer           data);
 298 static gboolean gtk_drag_button_release_cb     (GtkWidget         *widget,
 299                                                 GdkEventButton    *event,
 300                                                 gpointer           data);
 301 static gboolean gtk_drag_abort_timeout         (gpointer           data);
 302
 303 static void     set_icon_stock_pixbuf          (GdkDragContext    *context,
 304                                                 const gchar       *stock_id,
 305                                                 GdkPixbuf         *pixbuf,
 306                                                 gint               hot_x,
 307                                                 gint               hot_y,
 308                                                 gboolean           force_window);
 309
 310 /************************
 311  * Cursor and Icon data *
 312  ************************/
 313
 314 static struct {
 315   GdkDragAction action;
 316   const gchar  *name;
 317   const guint8 *data;
 318   GdkPixbuf    *pixbuf;
 319   GdkCursor    *cursor;
 320 } drag_cursors[] = {
 321   { GDK_ACTION_DEFAULT, NULL },
 322   { GDK_ACTION_ASK,   "dnd-ask",  dnd_cursor_ask,  NULL, NULL },
 323   { GDK_ACTION_COPY,  "dnd-copy", dnd_cursor_copy, NULL, NULL },
 324   { GDK_ACTION_MOVE,  "dnd-move", dnd_cursor_move, NULL, NULL },
 325   { GDK_ACTION_LINK,  "dnd-link", dnd_cursor_link, NULL, NULL },
 326   { 0              ,  "dnd-none", dnd_cursor_none, NULL, NULL },
 327 };
 328
 329 static const gint n_drag_cursors = sizeof (drag_cursors) / sizeof (drag_cursors[0]);
 330
 331 /*********************
 332  * Utility functions *
 333  *********************/
 334
 335 static void
 336 set_can_change_screen (GtkWidget *widget,
 337                        gboolean   can_change_screen)
 338 {
 339   can_change_screen = can_change_screen != FALSE;
 340
 341   g_object_set_data (G_OBJECT (widget), I_("gtk-dnd-can-change-screen"),
 342                      GUINT_TO_POINTER (can_change_screen));
 343 }
 344
 345 static gboolean
 346 get_can_change_screen (GtkWidget *widget)
 347 {
 348   return g_object_get_data (G_OBJECT (widget), "gtk-dnd-can-change-screen") != NULL;
 349
 350 }
 351
 352 static GtkWidget *
 353 gtk_drag_get_ipc_widget_for_screen (GdkScreen *screen)
 354 {
 355   GtkWidget *result;
 356   GSList *drag_widgets = g_object_get_data (G_OBJECT (screen),
 357                                             "gtk-dnd-ipc-widgets");
 358
 359   if (drag_widgets)
 360     {
 361       GSList *tmp = drag_widgets;
 362       result = drag_widgets->data;
 363       drag_widgets = drag_widgets->next;
 364       g_object_set_data (G_OBJECT (screen),
 365                          I_("gtk-dnd-ipc-widgets"),
 366                          drag_widgets);
 367       g_slist_free_1 (tmp);
 368     }
 369   else
 370     {
 371       result = gtk_window_new (GTK_WINDOW_POPUP);
 372       gtk_window_set_screen (GTK_WINDOW (result), screen);
 373       gtk_window_resize (GTK_WINDOW (result), 1, 1);
 374       gtk_window_move (GTK_WINDOW (result), -100, -100);
 375       gtk_widget_show (result);
 376     }
 377
 378   return result;
 379 }
 380
 381 static GtkWidget *
 382 gtk_drag_get_ipc_widget (GtkWidget *widget)
 383 {
 384   GtkWidget *result;
 385   GtkWidget *toplevel;
 386
 387   result = gtk_drag_get_ipc_widget_for_screen (gtk_widget_get_screen (widget));
 388
 389   toplevel = gtk_widget_get_toplevel (widget);
 390
 391   if (GTK_IS_WINDOW (toplevel))
 392     {
 393       if (GTK_WINDOW (toplevel)->group)
 394         gtk_window_group_add_window (GTK_WINDOW (toplevel)->group,
 395                                      GTK_WINDOW (result));
 396     }
 397
 398   return result;
 399 }
 400
 401
 402 #ifdef GDK_WINDOWING_X11
 403
 404 /*
 405  * We want to handle a handful of keys during DND, e.g. Escape to abort.
 406  * Grabbing the keyboard has the unfortunate side-effect of preventing
 407  * useful things such as using Alt-Tab to cycle between windows or
 408  * switching workspaces. Therefore, we just grab the few keys we are
 409  * interested in. Note that we need to put the grabs on the root window
 410  * in order for them to still work when the focus is moved to another
 411  * app/workspace.
 412  *
 413  * GDK needs a little help to successfully deliver root key events...
 414  */
 415
 416 static GdkFilterReturn
 417 root_key_filter (GdkXEvent *xevent,
 418                  GdkEvent  *event,
 419                  gpointer   data)
 420 {
 421   XEvent *ev = (XEvent *)xevent;
 422
 423   if ((ev->type == KeyPress || ev->type == KeyRelease) &&
 424       ev->xkey.root == ev->xkey.window)
 425     ev->xkey.window = (Window)data;
 426
 427   return GDK_FILTER_CONTINUE;
 428 }
 429
 430 typedef struct {
 431   gint keysym;
 432   gint modifiers;
 433 } GrabKey;
 434
 435 static GrabKey grab_keys[] = {
 436   { XK_Escape, 0 },
 437   { XK_space, 0 },
 438   { XK_KP_Space, 0 },
 439   { XK_Return, 0 },
 440   { XK_KP_Enter, 0 },
 441   { XK_Up, 0 },
 442   { XK_Up, Mod1Mask },
 443   { XK_Down, 0 },
 444   { XK_Down, Mod1Mask },
 445   { XK_Left, 0 },
 446   { XK_Left, Mod1Mask },
 447   { XK_Right, 0 },
 448   { XK_Right, Mod1Mask },
 449   { XK_KP_Up, 0 },
 450   { XK_KP_Up, Mod1Mask },
 451   { XK_KP_Down, 0 },
 452   { XK_KP_Down, Mod1Mask },
 453   { XK_KP_Left, 0 },
 454   { XK_KP_Left, Mod1Mask },
 455   { XK_KP_Right, 0 },
 456   { XK_KP_Right, Mod1Mask }
 457 };
 458
 459 static void
 460 grab_dnd_keys (GtkWidget *widget,
 461                guint32    time)
 462 {
 463   guint i;
 464   GdkWindow *window, *root;
 465   gint keycode;
 466
 467   window = widget->window;
 468   root = gdk_screen_get_root_window (gtk_widget_get_screen (widget));
 469
 470   gdk_error_trap_push ();
 471
 472   for (i = 0; i < G_N_ELEMENTS (grab_keys); ++i)
 473     {
 474       keycode = XKeysymToKeycode (GDK_WINDOW_XDISPLAY (window), grab_keys[i].keysym);
 475       XGrabKey (GDK_WINDOW_XDISPLAY (window),
 476                 keycode, grab_keys[i].modifiers,
 477                 GDK_WINDOW_XID (root),
 478                 FALSE,
 479                 GrabModeAsync,
 480                 GrabModeAsync);
 481     }
 482
 483   gdk_flush ();
 484   gdk_error_trap_pop ();
 485
 486   gdk_window_add_filter (NULL, root_key_filter, (gpointer) GDK_WINDOW_XID (window));
 487 }
 488
 489 static void
 490 ungrab_dnd_keys (GtkWidget *widget,
 491                  guint32    time)
 492 {
 493   guint i;
 494   GdkWindow *window, *root;
 495   gint keycode;
 496
 497   window = widget->window;
 498   root = gdk_screen_get_root_window (gtk_widget_get_screen (widget));
 499
 500   gdk_window_remove_filter (NULL, root_key_filter, (gpointer) GDK_WINDOW_XID (window));
 501
 502   gdk_error_trap_push ();
 503
 504   for (i = 0; i < G_N_ELEMENTS (grab_keys); ++i)
 505     {
 506       keycode = XKeysymToKeycode (GDK_WINDOW_XDISPLAY (window), grab_keys[i].keysym);
 507       XUngrabKey (GDK_WINDOW_XDISPLAY (window),
 508                   keycode, grab_keys[i].modifiers,
 509                   GDK_WINDOW_XID (root));
 510     }
 511
 512   gdk_flush ();
 513   gdk_error_trap_pop ();
 514 }
 515
 516 #else
 517
 518 static void
 519 grab_dnd_keys (GtkWidget *widget,
 520                guint32    time)
 521 {
 522   gdk_keyboard_grab (widget->window, FALSE, time);
 523 }
 524
 525 static void
 526 ungrab_dnd_keys (GtkWidget *widget,
 527                  guint32    time)
 528 {
 529   gdk_display_keyboard_ungrab (gtk_widget_get_display (widget), time);
 530 }
 531
 532 #endif
 533
 534
 535 /***************************************************************
 536  * gtk_drag_release_ipc_widget:
 537  *     Releases widget retrieved with gtk_drag_get_ipc_widget ()
 538  *   arguments:
 539  *     widget: the widget to release.
 540  *   results:
 541  ***************************************************************/
 542
 543 static void
 544 gtk_drag_release_ipc_widget (GtkWidget *widget)
 545 {
 546   GtkWindow *window = GTK_WINDOW (widget);
 547   GdkScreen *screen = gtk_widget_get_screen (widget);
 548   GSList *drag_widgets = g_object_get_data (G_OBJECT (screen),
 549                                             "gtk-dnd-ipc-widgets");
 550   ungrab_dnd_keys (widget, GDK_CURRENT_TIME);
 551   if (window->group)
 552     gtk_window_group_remove_window (window->group, window);
 553   drag_widgets = g_slist_prepend (drag_widgets, widget);
 554   g_object_set_data (G_OBJECT (screen),
 555                      I_("gtk-dnd-ipc-widgets"),
 556                      drag_widgets);
 557 }
 558
 559 static guint32
 560 gtk_drag_get_event_time (GdkEvent *event)
 561 {
 562   guint32 tm = GDK_CURRENT_TIME;
 563
 564   if (event)
 565     switch (event->type)
 566       {
 567       case GDK_MOTION_NOTIFY:
 568         tm = event->motion.time; break;
 569       case GDK_BUTTON_PRESS:
 570       case GDK_2BUTTON_PRESS:
 571       case GDK_3BUTTON_PRESS:
 572       case GDK_BUTTON_RELEASE:
 573         tm = event->button.time; break;
 574       case GDK_KEY_PRESS:
 575       case GDK_KEY_RELEASE:
 576         tm = event->key.time; break;
 577       case GDK_ENTER_NOTIFY:
 578       case GDK_LEAVE_NOTIFY:
 579         tm = event->crossing.time; break;
 580       case GDK_PROPERTY_NOTIFY:
 581         tm = event->property.time; break;
 582       case GDK_SELECTION_CLEAR:
 583       case GDK_SELECTION_REQUEST:
 584       case GDK_SELECTION_NOTIFY:
 585         tm = event->selection.time; break;
 586       case GDK_PROXIMITY_IN:
 587       case GDK_PROXIMITY_OUT:
 588         tm = event->proximity.time; break;
 589       default:                  /* use current time */
 590         break;
 591       }
 592
 593   return tm;
 594 }
 595
 596 static void
 597 gtk_drag_get_event_actions (GdkEvent *event,
 598                             gint button,
 599                             GdkDragAction  actions,
 600                             GdkDragAction *suggested_action,
 601                             GdkDragAction *possible_actions)
 602 {
 603   *suggested_action = 0;
 604   *possible_actions = 0;
 605
 606   if (event)
 607     {
 608       GdkModifierType state = 0;
 609
 610       switch (event->type)
 611         {
 612         case GDK_MOTION_NOTIFY:
 613           state = event->motion.state;
 614           break;
 615         case GDK_BUTTON_PRESS:
 616         case GDK_2BUTTON_PRESS:
 617         case GDK_3BUTTON_PRESS:
 618         case GDK_BUTTON_RELEASE:
 619           state = event->button.state;
 620           break;
 621         case GDK_KEY_PRESS:
 622         case GDK_KEY_RELEASE:
 623           state = event->key.state;
 624           break;
 625         case GDK_ENTER_NOTIFY:
 626         case GDK_LEAVE_NOTIFY:
 627           state = event->crossing.state;
 628           break;
 629         default:
 630           break;
 631         }
 632
 633       if ((button == 2 || button == 3) && (actions & GDK_ACTION_ASK))
 634         {
 635           *suggested_action = GDK_ACTION_ASK;
 636           *possible_actions = actions;
 637         }
 638       else if (state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK))
 639         {
 640           if ((state & GDK_SHIFT_MASK) && (state & GDK_CONTROL_MASK))
 641             {
 642               if (actions & GDK_ACTION_LINK)
 643                 {
 644                   *suggested_action = GDK_ACTION_LINK;
 645                   *possible_actions = GDK_ACTION_LINK;
 646                 }
 647             }
 648           else if (state & GDK_CONTROL_MASK)
 649             {
 650               if (actions & GDK_ACTION_COPY)
 651                 {
 652                   *suggested_action = GDK_ACTION_COPY;
 653                   *possible_actions = GDK_ACTION_COPY;
 654                 }
 655               return;
 656             }
 657           else
 658             {
 659               if (actions & GDK_ACTION_MOVE)
 660                 {
 661                   *suggested_action = GDK_ACTION_MOVE;
 662                   *possible_actions = GDK_ACTION_MOVE;
 663                 }
 664               return;
 665             }
 666         }
 667       else
 668         {
 669           *possible_actions = actions;
 670
 671           if ((state & (GDK_MOD1_MASK)) && (actions & GDK_ACTION_ASK))
 672             *suggested_action = GDK_ACTION_ASK;
 673           else if (actions & GDK_ACTION_COPY)
 674             *suggested_action =  GDK_ACTION_COPY;
 675           else if (actions & GDK_ACTION_MOVE)
 676             *suggested_action = GDK_ACTION_MOVE;
 677           else if (actions & GDK_ACTION_LINK)
 678             *suggested_action = GDK_ACTION_LINK;
 679         }
 680     }
 681   else
 682     {
 683       *possible_actions = actions;
 684
 685       if (actions & GDK_ACTION_COPY)
 686         *suggested_action =  GDK_ACTION_COPY;
 687       else if (actions & GDK_ACTION_MOVE)
 688         *suggested_action = GDK_ACTION_MOVE;
 689       else if (actions & GDK_ACTION_LINK)
 690         *suggested_action = GDK_ACTION_LINK;
 691     }
 692 }
 693
 694 static gboolean
 695 gtk_drag_can_use_rgba_cursor (GdkDisplay *display,
 696                               gint        width,
 697                               gint        height)
 698 {
 699   guint max_width, max_height;
 700
 701   if (!gdk_display_supports_cursor_color (display))
 702     return FALSE;
 703
 704   if (!gdk_display_supports_cursor_alpha (display))
 705     return FALSE;
 706
 707   gdk_display_get_maximal_cursor_size (display,
 708                                        &max_width,
 709                                        &max_height);
 710   if (width > max_width || height > max_height)
 711     {
 712        /* can't use rgba cursor (too large) */
 713       return FALSE;
 714     }
 715
 716   return TRUE;
 717 }
 718
 719 static GdkCursor *
 720 gtk_drag_get_cursor (GdkDisplay        *display,
 721                      GdkDragAction      action,
 722                      GtkDragSourceInfo *info)
 723 {
 724   gint i;
 725
 726   /* reconstruct the cursors for each new drag (thus !info),
 727    * to catch cursor theme changes
 728    */
 729   if (!info)
 730     {
 731       for (i = 0 ; i < n_drag_cursors - 1; i++)
 732         if (drag_cursors[i].cursor != NULL)
 733           {
 734             gdk_cursor_unref (drag_cursors[i].cursor);
 735             drag_cursors[i].cursor = NULL;
 736           }
 737     }
 738
 739   for (i = 0 ; i < n_drag_cursors - 1; i++)
 740     if (drag_cursors[i].action == action)
 741       break;
 742
 743   if (drag_cursors[i].pixbuf == NULL)
 744     drag_cursors[i].pixbuf =
 745       gdk_pixbuf_new_from_inline (-1, drag_cursors[i].data, FALSE, NULL);
 746
 747   if (drag_cursors[i].cursor != NULL)
 748     {
 749       if (display != gdk_cursor_get_display (drag_cursors[i].cursor))
 750         {
 751           gdk_cursor_unref (drag_cursors[i].cursor);
 752           drag_cursors[i].cursor = NULL;
 753         }
 754     }
 755
 756   if (drag_cursors[i].cursor == NULL)
 757     drag_cursors[i].cursor = gdk_cursor_new_from_name (display, drag_cursors[i].name);
 758
 759   if (drag_cursors[i].cursor == NULL)
 760     drag_cursors[i].cursor = gdk_cursor_new_from_pixbuf (display, drag_cursors[i].pixbuf, 0, 0);
 761
 762   if (info && info->icon_pixbuf)
 763     {
 764       gint cursor_width, cursor_height;
 765       gint icon_width, icon_height;
 766       gint width, height;
 767       GdkPixbuf *cursor_pixbuf, *pixbuf;
 768       gint hot_x, hot_y;
 769       gint icon_x, icon_y, ref_x, ref_y;
 770
 771       if (info->drag_cursors[i] != NULL)
 772         {
 773           if (display == gdk_cursor_get_display (info->drag_cursors[i]))
 774             return info->drag_cursors[i];
 775
 776           gdk_cursor_unref (info->drag_cursors[i]);
 777           info->drag_cursors[i] = NULL;
 778         }
 779
 780       icon_x = info->hot_x;
 781       icon_y = info->hot_y;
 782       icon_width = gdk_pixbuf_get_width (info->icon_pixbuf);
 783       icon_height = gdk_pixbuf_get_height (info->icon_pixbuf);
 784
 785       hot_x = hot_y = 0;
 786       cursor_pixbuf = gdk_cursor_get_image (drag_cursors[i].cursor);
 787       if (!cursor_pixbuf)
 788         cursor_pixbuf = g_object_ref (drag_cursors[i].pixbuf);
 789       else
 790         {
 791           if (gdk_pixbuf_get_option (cursor_pixbuf, "x_hot"))
 792             hot_x = atoi (gdk_pixbuf_get_option (cursor_pixbuf, "x_hot"));
 793
 794           if (gdk_pixbuf_get_option (cursor_pixbuf, "y_hot"))
 795             hot_y = atoi (gdk_pixbuf_get_option (cursor_pixbuf, "y_hot"));
 796
 797 #if 0
 798           /* The code below is an attempt to let cursor themes
 799            * determine the attachment of the icon to enable things
 800            * like the following:
 801            *
 802            *    +-----+
 803            *    |     |
 804            *    |     ||
 805            *    +-----+|
 806            *        ---+
 807            *
 808            * It does not work since Xcursor doesn't allow to attach
 809            * any additional information to cursors in a retrievable
 810            * way  (there are comments, but no way to get at them
 811            * short of searching for the actual cursor file).
 812            * If this code ever gets used, the icon_window placement
 813            * must be changed to recognize these placement options
 814            * as well. Note that this code ignores info->hot_x/y.
 815            */
 816           for (j = 0; j < 10; j++)
 817             {
 818               const gchar *opt;
 819               gchar key[32];
 820               gchar **toks;
 821               GtkAnchorType icon_anchor;
 822
 823               g_snprintf (key, 32, "comment%d", j);
 824               opt = gdk_pixbuf_get_option (cursor_pixbuf, key);
 825               if (opt && g_str_has_prefix ("icon-attach:", opt))
 826                 {
 827                   toks = g_strsplit (opt + strlen ("icon-attach:"), "'", -1);
 828                   if (g_strv_length (toks) != 3)
 829                     {
 830                       g_strfreev (toks);
 831                       break;
 832                     }
 833                   icon_anchor = atoi (toks[0]);
 834                   icon_x = atoi (toks[1]);
 835                   icon_y = atoi (toks[2]);
 836
 837                   switch (icon_anchor)
 838                     {
 839                     case GTK_ANCHOR_NORTH:
 840                     case GTK_ANCHOR_CENTER:
 841                     case GTK_ANCHOR_SOUTH:
 842                       icon_x += icon_width / 2;
 843                       break;
 844                     case GTK_ANCHOR_NORTH_EAST:
 845                     case GTK_ANCHOR_EAST:
 846                     case GTK_ANCHOR_SOUTH_EAST:
 847                       icon_x += icon_width;
 848                       break;
 849                     default: ;
 850                     }
 851
 852                   switch (icon_anchor)
 853                     {
 854                     case GTK_ANCHOR_WEST:
 855                     case GTK_ANCHOR_CENTER:
 856                     case GTK_ANCHOR_EAST:
 857                       icon_y += icon_height / 2;
 858                       break;
 859                     case GTK_ANCHOR_SOUTH_WEST:
 860                     case GTK_ANCHOR_SOUTH:
 861                     case GTK_ANCHOR_SOUTH_EAST:
 862                       icon_x += icon_height;
 863                       break;
 864                     default: ;
 865                     }
 866
 867                   g_strfreev (toks);
 868                   break;
 869                 }
 870             }
 871 #endif
 872         }
 873
 874       cursor_width = gdk_pixbuf_get_width (cursor_pixbuf);
 875       cursor_height = gdk_pixbuf_get_height (cursor_pixbuf);
 876
 877       ref_x = MAX (hot_x, icon_x);
 878       ref_y = MAX (hot_y, icon_y);
 879       width = ref_x + MAX (cursor_width - hot_x, icon_width - icon_x);
 880       height = ref_y + MAX (cursor_height - hot_y, icon_height - icon_y);
 881
 882       if (gtk_drag_can_use_rgba_cursor (display, width, height))
 883         {
 884           /* Composite cursor and icon so that both hotspots
 885            * end up at (ref_x, ref_y)
 886            */
 887           pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 888                                    width, height);
 889
 890           gdk_pixbuf_fill (pixbuf, 0xff000000);
 891
 892           gdk_pixbuf_composite (info->icon_pixbuf, pixbuf,
 893                                 ref_x - icon_x, ref_y - icon_y,
 894                                 icon_width, icon_height,
 895                                 ref_x - icon_x, ref_y - icon_y,
 896                                 1.0, 1.0,
 897                                 GDK_INTERP_BILINEAR, 255);
 898
 899           gdk_pixbuf_composite (cursor_pixbuf, pixbuf,
 900                                 ref_x - hot_x, ref_y - hot_y,
 901                                 cursor_width, cursor_height,
 902                                 ref_x - hot_x, ref_y - hot_y,
 903                                 1.0, 1.0,
 904                                 GDK_INTERP_BILINEAR, 255);
 905
 906           info->drag_cursors[i] =
 907             gdk_cursor_new_from_pixbuf (display, pixbuf, ref_x, ref_y);
 908
 909           g_object_unref (pixbuf);
 910         }
 911
 912       g_object_unref (cursor_pixbuf);
 913
 914       if (info->drag_cursors[i] != NULL)
 915         return info->drag_cursors[i];
 916     }
 917
 918   return drag_cursors[i].cursor;
 919 }
 920
 921 static void
 922 gtk_drag_update_cursor (GtkDragSourceInfo *info)
 923 {
 924   GdkCursor *cursor;
 925   gint i;
 926
 927   if (!info->have_grab)
 928     return;
 929
 930   for (i = 0 ; i < n_drag_cursors - 1; i++)
 931     if (info->cursor == drag_cursors[i].cursor ||
 932         info->cursor == info->drag_cursors[i])
 933       break;
 934
 935   if (i == n_drag_cursors)
 936     return;
 937
 938   cursor = gtk_drag_get_cursor (gdk_cursor_get_display (info->cursor),
 939                                 drag_cursors[i].action, info);
 940
 941   if (cursor != info->cursor)
 942     {
 943       gdk_pointer_grab (info->ipc_widget->window, FALSE,
 944                         GDK_POINTER_MOTION_MASK |
 945                         GDK_BUTTON_RELEASE_MASK,
 946                         NULL,
 947                         cursor, info->grab_time);
 948       info->cursor = cursor;
 949     }
 950 }
 951
 952 /********************
 953  * Destination side *
 954  ********************/
 955
 956 /*************************************************************
 957  * gtk_drag_get_data:
 958  *     Get the data for a drag or drop
 959  *   arguments:
 960  *     context - drag context
 961  *     target  - format to retrieve the data in.
 962  *     time    - timestamp of triggering event.
 963  *
 964  *   results:
 965  *************************************************************/
 966
 967 void
 968 gtk_drag_get_data (GtkWidget      *widget,
 969                    GdkDragContext *context,
 970                    GdkAtom         target,
 971                    guint32         time)
 972 {
 973   GtkWidget *selection_widget;
 974
 975   g_return_if_fail (GTK_IS_WIDGET (widget));
 976   g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
 977   g_return_if_fail (!context->is_source);
 978
 979   selection_widget = gtk_drag_get_ipc_widget (widget);
 980
 981   g_object_ref (context);
 982   g_object_ref (widget);
 983
 984   g_signal_connect (selection_widget, "selection-received",
 985                     G_CALLBACK (gtk_drag_selection_received), widget);
 986
 987   g_object_set_data (G_OBJECT (selection_widget), I_("drag-context"), context);
 988
 989   gtk_selection_convert (selection_widget,
 990                          gdk_drag_get_selection (context),
 991                          target,
 992                          time);
 993 }
 994
 995
 996 /*************************************************************
 997  * gtk_drag_get_source_widget:
 998  *     Get the widget the was the source of this drag, if
 999  *     the drag originated from this application.
1000  *   arguments:
1001  *     context: The drag context for this drag
1002  *   results:
1003  *     The source widget, or NULL if the drag originated from
1004  *     a different application.
1005  *************************************************************/
1006
1007 GtkWidget *
1008 gtk_drag_get_source_widget (GdkDragContext *context)
1009 {
1010   GSList *tmp_list;
1011
1012   g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
1013   g_return_val_if_fail (!context->is_source, NULL);
1014
1015   tmp_list = source_widgets;
1016   while (tmp_list)
1017     {
1018       GtkWidget *ipc_widget = tmp_list->data;
1019
1020       if (ipc_widget->window == context->source_window)
1021         {
1022           GtkDragSourceInfo *info;
1023           info = g_object_get_data (G_OBJECT (ipc_widget), "gtk-info");
1024
1025           return info ? info->widget : NULL;
1026         }
1027
1028       tmp_list = tmp_list->next;
1029     }
1030
1031   return NULL;
1032 }
1033
1034 /*************************************************************
1035  * gtk_drag_finish:
1036  *     Notify the drag source that the transfer of data
1037  *     is complete.
1038  *   arguments:
1039  *     context: The drag context for this drag
1040  *     success: Was the data successfully transferred?
1041  *     time:    The timestamp to use when notifying the destination.
1042  *   results:
1043  *************************************************************/
1044
1045 void
1046 gtk_drag_finish (GdkDragContext *context,
1047                  gboolean        success,
1048                  gboolean        del,
1049                  guint32         time)
1050 {
1051   GdkAtom target = GDK_NONE;
1052
1053   g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
1054   g_return_if_fail (!context->is_source);
1055
1056   if (success && del)
1057     {
1058       target = gdk_atom_intern_static_string ("DELETE");
1059     }
1060   else if (context->protocol == GDK_DRAG_PROTO_MOTIF)
1061     {
1062       target = gdk_atom_intern_static_string (success ?
1063                                               "XmTRANSFER_SUCCESS" :
1064                                               "XmTRANSFER_FAILURE");
1065     }
1066
1067   if (target != GDK_NONE)
1068     {
1069       GtkWidget *selection_widget = gtk_drag_get_ipc_widget_for_screen (gdk_drawable_get_screen (context->source_window));
1070
1071       g_object_ref (context);
1072
1073       g_object_set_data (G_OBJECT (selection_widget), I_("drag-context"), context);
1074       g_signal_connect (selection_widget, "selection-received",
1075                         G_CALLBACK (gtk_drag_selection_received),
1076                         NULL);
1077
1078       gtk_selection_convert (selection_widget,
1079                              gdk_drag_get_selection (context),
1080                              target,
1081                              time);
1082     }
1083
1084   if (!(success && del))
1085     gdk_drop_finish (context, success, time);
1086 }
1087
1088 /*************************************************************
1089  * gtk_drag_highlight_expose:
1090  *     Callback for expose_event for highlighted widgets.
1091  *   arguments:
1092  *     widget:
1093  *     event:
1094  *     data:
1095  *   results:
1096  *************************************************************/
1097
1098 static gboolean
1099 gtk_drag_highlight_expose (GtkWidget      *widget,
1100                            GdkEventExpose *event,
1101                            gpointer        data)
1102 {
1103   gint x, y, width, height;
1104
1105   if (gtk_widget_is_drawable (widget))
1106     {
1107       cairo_t *cr;
1108
1109       if (!gtk_widget_get_has_window (widget))
1110         {
1111           x = widget->allocation.x;
1112           y = widget->allocation.y;
1113           width = widget->allocation.width;
1114           height = widget->allocation.height;
1115         }
1116       else
1117         {
1118           x = 0;
1119           y = 0;
1120           gdk_drawable_get_size (widget->window, &width, &height);
1121         }
1122
1123       gtk_paint_shadow (widget->style, widget->window,
1124                         GTK_STATE_NORMAL, GTK_SHADOW_OUT,
1125                         &event->area, widget, "dnd",
1126                         x, y, width, height);
1127
1128       cr = gdk_cairo_create (widget->window);
1129       cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); /* black */
1130       cairo_set_line_width (cr, 1.0);
1131       cairo_rectangle (cr,
1132                        x + 0.5, y + 0.5,
1133                        width - 1, height - 1);
1134       cairo_stroke (cr);
1135       cairo_destroy (cr);
1136     }
1137
1138   return FALSE;
1139 }
1140
1141 /*************************************************************
1142  * gtk_drag_highlight:
1143  *     Highlight the given widget in the default manner.
1144  *   arguments:
1145  *     widget:
1146  *   results:
1147  *************************************************************/
1148
1149 void
1150 gtk_drag_highlight (GtkWidget  *widget)
1151 {
1152   g_return_if_fail (GTK_IS_WIDGET (widget));
1153
1154   g_signal_connect_after (widget, "expose-event",
1155                           G_CALLBACK (gtk_drag_highlight_expose),
1156                           NULL);
1157
1158   gtk_widget_queue_draw (widget);
1159 }
1160
1161 /*************************************************************
1162  * gtk_drag_unhighlight:
1163  *     Refresh the given widget to remove the highlight.
1164  *   arguments:
1165  *     widget:
1166  *   results:
1167  *************************************************************/
1168
1169 void
1170 gtk_drag_unhighlight (GtkWidget *widget)
1171 {
1172   g_return_if_fail (GTK_IS_WIDGET (widget));
1173
1174   g_signal_handlers_disconnect_by_func (widget,
1175                                         gtk_drag_highlight_expose,
1176                                         NULL);
1177
1178   gtk_widget_queue_draw (widget);
1179 }
1180
1181 static void
1182 gtk_drag_dest_set_internal (GtkWidget       *widget,
1183                             GtkDragDestSite *site)
1184 {
1185   GtkDragDestSite *old_site;
1186
1187   g_return_if_fail (widget != NULL);
1188
1189   /* HACK, do this in the destroy */
1190   old_site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
1191   if (old_site)
1192     {
1193       g_signal_handlers_disconnect_by_func (widget,
1194                                             gtk_drag_dest_realized,
1195                                             old_site);
1196       g_signal_handlers_disconnect_by_func (widget,
1197                                             gtk_drag_dest_hierarchy_changed,
1198                                             old_site);
1199
1200       site->track_motion = old_site->track_motion;
1201     }
1202
1203   if (GTK_WIDGET_REALIZED (widget))
1204     gtk_drag_dest_realized (widget);
1205
1206   g_signal_connect (widget, "realize",
1207                     G_CALLBACK (gtk_drag_dest_realized), site);
1208   g_signal_connect (widget, "hierarchy-changed",
1209                     G_CALLBACK (gtk_drag_dest_hierarchy_changed), site);
1210
1211   g_object_set_data_full (G_OBJECT (widget), I_("gtk-drag-dest"),
1212                           site, gtk_drag_dest_site_destroy);
1213 }
1214
1215 /**
1216  * gtk_drag_dest_set:
1217  * @widget: a #GtkWidget
1218  * @flags: which types of default drag behavior to use
1219  * @targets: a pointer to an array of #GtkTargetEntry<!-- -->s indicating
1220  * the drop types that this @widget will accept. Later you can access the list
1221  * with gtk_drag_dest_get_target_list() and gtk_drag_dest_find_target().
1222  * @n_targets: the number of entries in @targets.
1223  * @actions: a bitmask of possible actions for a drop onto this @widget.
1224  *
1225  * Sets a widget as a potential drop destination, and adds default behaviors.
1226  *
1227  * The default behaviors listed in @flags have an effect similar
1228  * to installing default handlers for the widget's drag-and-drop signals
1229  * (#GtkWidget:drag-motion, #GtkWidget:drag-drop, ...). They all exist
1230  * for convenience. When passing #GTK_DEST_DEFAULT_ALL for instance it is
1231  * sufficient to connect to the widget's #GtkWidget::drag-data-received
1232  * signal to get primitive, but consistent drag-and-drop support.
1233  *
1234  * Things become more complicated when you try to preview the dragged data,
1235  * as described in the documentation for #GtkWidget:drag-motion. The default
1236  * behaviors described by @flags make some assumptions, that can conflict
1237  * with your own signal handlers. For instance #GTK_DEST_DEFAULT_DROP causes
1238  * invokations of gdk_drag_status() in the context of #GtkWidget:drag-motion,
1239  * and invokations of gtk_drag_finish() in #GtkWidget:drag-data-received.
1240  * Especially the later is dramatic, when your own #GtkWidget:drag-motion
1241  * handler calls gtk_drag_get_data() to inspect the dragged data.
1242  *
1243  * There's no way to set a default action here, you can use the
1244  * #GtkWidget:drag-motion callback for that. Here's an example which selects
1245  * the action to use depending on whether the control key is pressed or not:
1246  * |[
1247  * static void
1248  * drag_motion (GtkWidget *widget,
1249  *              GdkDragContext *context,
1250  *              gint x,
1251  *              gint y,
1252  *              guint time)
1253  * {
1254  *   GdkModifierType mask;
1255  *
1256  *   gdk_window_get_pointer (gtk_widget_get_window (widget),
1257  *                           NULL, NULL, &mask);
1258  *   if (mask & GDK_CONTROL_MASK)
1259  *     gdk_drag_status (context, GDK_ACTION_COPY, time);
1260  *   else
1261  *     gdk_drag_status (context, GDK_ACTION_MOVE, time);
1262  * }
1263  * ]|
1264  */
1265 void
1266 gtk_drag_dest_set (GtkWidget            *widget,
1267                    GtkDestDefaults       flags,
1268                    const GtkTargetEntry *targets,
1269                    gint                  n_targets,
1270                    GdkDragAction         actions)
1271 {
1272   GtkDragDestSite *site;
1273
1274   g_return_if_fail (GTK_IS_WIDGET (widget));
1275
1276   site = g_new (GtkDragDestSite, 1);
1277
1278   site->flags = flags;
1279   site->have_drag = FALSE;
1280   if (targets)
1281     site->target_list = gtk_target_list_new (targets, n_targets);
1282   else
1283     site->target_list = NULL;
1284   site->actions = actions;
1285   site->do_proxy = FALSE;
1286   site->proxy_window = NULL;
1287   site->track_motion = FALSE;
1288
1289   gtk_drag_dest_set_internal (widget, site);
1290 }
1291
1292 /*************************************************************
1293  * gtk_drag_dest_set_proxy:
1294  *     Set up this widget to proxy drags elsewhere.
1295  *   arguments:
1296  *     widget:
1297  *     proxy_window:    window to which forward drag events
1298  *     protocol:        Drag protocol which the dest widget accepts
1299  *     use_coordinates: If true, send the same coordinates to the
1300  *                      destination, because it is a embedded
1301  *                      subwindow.
1302  *   results:
1303  *************************************************************/
1304
1305 void
1306 gtk_drag_dest_set_proxy (GtkWidget      *widget,
1307                          GdkWindow      *proxy_window,
1308                          GdkDragProtocol protocol,
1309                          gboolean        use_coordinates)
1310 {
1311   GtkDragDestSite *site;
1312
1313   g_return_if_fail (GTK_IS_WIDGET (widget));
1314   g_return_if_fail (!proxy_window || GDK_IS_WINDOW (proxy_window));
1315
1316   site = g_new (GtkDragDestSite, 1);
1317
1318   site->flags = 0;
1319   site->have_drag = FALSE;
1320   site->target_list = NULL;
1321   site->actions = 0;
1322   site->proxy_window = proxy_window;
1323   if (proxy_window)
1324     g_object_ref (proxy_window);
1325   site->do_proxy = TRUE;
1326   site->proxy_protocol = protocol;
1327   site->proxy_coords = use_coordinates;
1328   site->track_motion = FALSE;
1329
1330   gtk_drag_dest_set_internal (widget, site);
1331 }
1332
1333 /*************************************************************
1334  * gtk_drag_dest_unset
1335  *     Unregister this widget as a drag target.
1336  *   arguments:
1337  *     widget:
1338  *   results:
1339  *************************************************************/
1340
1341 void
1342 gtk_drag_dest_unset (GtkWidget *widget)
1343 {
1344   GtkDragDestSite *old_site;
1345
1346   g_return_if_fail (GTK_IS_WIDGET (widget));
1347
1348   old_site = g_object_get_data (G_OBJECT (widget),
1349                                 "gtk-drag-dest");
1350   if (old_site)
1351     {
1352       g_signal_handlers_disconnect_by_func (widget,
1353                                             gtk_drag_dest_realized,
1354                                             old_site);
1355       g_signal_handlers_disconnect_by_func (widget,
1356                                             gtk_drag_dest_hierarchy_changed,
1357                                             old_site);
1358     }
1359
1360   g_object_set_data (G_OBJECT (widget), I_("gtk-drag-dest"), NULL);
1361 }
1362
1363 /**
1364  * gtk_drag_dest_get_target_list:
1365  * @widget: a #GtkWidget
1366  *
1367  * Returns the list of targets this widget can accept from
1368  * drag-and-drop.
1369  *
1370  * Return value: the #GtkTargetList, or %NULL if none
1371  **/
1372 GtkTargetList*
1373 gtk_drag_dest_get_target_list (GtkWidget *widget)
1374 {
1375   GtkDragDestSite *site;
1376
1377   g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
1378
1379   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
1380
1381   return site ? site->target_list : NULL;
1382 }
1383
1384 /**
1385  * gtk_drag_dest_set_target_list:
1386  * @widget: a #GtkWidget that's a drag destination
1387  * @target_list: (allow-none): list of droppable targets, or %NULL for none
1388  *
1389  * Sets the target types that this widget can accept from drag-and-drop.
1390  * The widget must first be made into a drag destination with
1391  * gtk_drag_dest_set().
1392  **/
1393 void
1394 gtk_drag_dest_set_target_list (GtkWidget      *widget,
1395                                GtkTargetList  *target_list)
1396 {
1397   GtkDragDestSite *site;
1398
1399   g_return_if_fail (GTK_IS_WIDGET (widget));
1400
1401   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
1402
1403   if (!site)
1404     {
1405       g_warning ("Can't set a target list on a widget until you've called gtk_drag_dest_set() "
1406                  "to make the widget into a drag destination");
1407       return;
1408     }
1409
1410   if (target_list)
1411     gtk_target_list_ref (target_list);
1412
1413   if (site->target_list)
1414     gtk_target_list_unref (site->target_list);
1415
1416   site->target_list = target_list;
1417 }
1418
1419 /**
1420  * gtk_drag_dest_add_text_targets:
1421  * @widget: a #GtkWidget that's a drag destination
1422  *
1423  * Add the text targets supported by #GtkSelection to
1424  * the target list of the drag destination. The targets
1425  * are added with @info = 0. If you need another value,
1426  * use gtk_target_list_add_text_targets() and
1427  * gtk_drag_dest_set_target_list().
1428  *
1429  * Since: 2.6
1430  **/
1431 void
1432 gtk_drag_dest_add_text_targets (GtkWidget *widget)
1433 {
1434   GtkTargetList *target_list;
1435
1436   target_list = gtk_drag_dest_get_target_list (widget);
1437   if (target_list)
1438     gtk_target_list_ref (target_list);
1439   else
1440     target_list = gtk_target_list_new (NULL, 0);
1441   gtk_target_list_add_text_targets (target_list, 0);
1442   gtk_drag_dest_set_target_list (widget, target_list);
1443   gtk_target_list_unref (target_list);
1444 }
1445
1446 /**
1447  * gtk_drag_dest_add_image_targets:
1448  * @widget: a #GtkWidget that's a drag destination
1449  *
1450  * Add the image targets supported by #GtkSelection to
1451  * the target list of the drag destination. The targets
1452  * are added with @info = 0. If you need another value,
1453  * use gtk_target_list_add_image_targets() and
1454  * gtk_drag_dest_set_target_list().
1455  *
1456  * Since: 2.6
1457  **/
1458 void
1459 gtk_drag_dest_add_image_targets (GtkWidget *widget)
1460 {
1461   GtkTargetList *target_list;
1462
1463   target_list = gtk_drag_dest_get_target_list (widget);
1464   if (target_list)
1465     gtk_target_list_ref (target_list);
1466   else
1467     target_list = gtk_target_list_new (NULL, 0);
1468   gtk_target_list_add_image_targets (target_list, 0, FALSE);
1469   gtk_drag_dest_set_target_list (widget, target_list);
1470   gtk_target_list_unref (target_list);
1471 }
1472
1473 /**
1474  * gtk_drag_dest_add_uri_targets:
1475  * @widget: a #GtkWidget that's a drag destination
1476  *
1477  * Add the URI targets supported by #GtkSelection to
1478  * the target list of the drag destination. The targets
1479  * are added with @info = 0. If you need another value,
1480  * use gtk_target_list_add_uri_targets() and
1481  * gtk_drag_dest_set_target_list().
1482  *
1483  * Since: 2.6
1484  **/
1485 void
1486 gtk_drag_dest_add_uri_targets (GtkWidget *widget)
1487 {
1488   GtkTargetList *target_list;
1489
1490   target_list = gtk_drag_dest_get_target_list (widget);
1491   if (target_list)
1492     gtk_target_list_ref (target_list);
1493   else
1494     target_list = gtk_target_list_new (NULL, 0);
1495   gtk_target_list_add_uri_targets (target_list, 0);
1496   gtk_drag_dest_set_target_list (widget, target_list);
1497   gtk_target_list_unref (target_list);
1498 }
1499
1500 /**
1501  * gtk_drag_dest_set_track_motion:
1502  * @widget: a #GtkWidget that's a drag destination
1503  * @track_motion: whether to accept all targets
1504  *
1505  * Tells the widget to emit ::drag-motion and ::drag-leave
1506  * events regardless of the targets and the %GTK_DEST_DEFAULT_MOTION
1507  * flag.
1508  *
1509  * This may be used when a widget wants to do generic
1510  * actions regardless of the targets that the source offers.
1511  *
1512  * Since: 2.10
1513  **/
1514 void
1515 gtk_drag_dest_set_track_motion (GtkWidget *widget,
1516                                 gboolean   track_motion)
1517 {
1518   GtkDragDestSite *site;
1519
1520   g_return_if_fail (GTK_IS_WIDGET (widget));
1521
1522   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
1523
1524   g_return_if_fail (site != NULL);
1525
1526   site->track_motion = track_motion != FALSE;
1527 }
1528
1529 /**
1530  * gtk_drag_dest_get_track_motion:
1531  * @widget: a #GtkWidget that's a drag destination
1532  *
1533  * Returns whether the widget has been configured to always
1534  * emit ::drag-motion signals.
1535  *
1536  * Return Value: %TRUE if the widget always emits ::drag-motion events
1537  *
1538  * Since: 2.10
1539  **/
1540 gboolean
1541 gtk_drag_dest_get_track_motion (GtkWidget *widget)
1542 {
1543   GtkDragDestSite *site;
1544
1545   g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
1546
1547   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
1548
1549   if (site)
1550     return site->track_motion;
1551
1552   return FALSE;
1553 }
1554
1555 /*************************************************************
1556  * _gtk_drag_dest_handle_event:
1557  *     Called from widget event handling code on Drag events
1558  *     for destinations.
1559  *
1560  *   arguments:
1561  *     toplevel: Toplevel widget that received the event
1562  *     event:
1563  *   results:
1564  *************************************************************/
1565
1566 void
1567 _gtk_drag_dest_handle_event (GtkWidget *toplevel,
1568                             GdkEvent  *event)
1569 {
1570   GtkDragDestInfo *info;
1571   GdkDragContext *context;
1572
1573   g_return_if_fail (toplevel != NULL);
1574   g_return_if_fail (event != NULL);
1575
1576   context = event->dnd.context;
1577
1578   info = gtk_drag_get_dest_info (context, TRUE);
1579
1580   /* Find the widget for the event */
1581   switch (event->type)
1582     {
1583     case GDK_DRAG_ENTER:
1584       break;
1585
1586     case GDK_DRAG_LEAVE:
1587       if (info->widget)
1588         {
1589           gtk_drag_dest_leave (info->widget, context, event->dnd.time);
1590           info->widget = NULL;
1591         }
1592       break;
1593
1594     case GDK_DRAG_MOTION:
1595     case GDK_DROP_START:
1596       {
1597         GtkDragFindData data;
1598         gint tx, ty;
1599
1600         if (event->type == GDK_DROP_START)
1601           {
1602             info->dropped = TRUE;
1603             /* We send a leave here so that the widget unhighlights
1604              * properly.
1605              */
1606             if (info->widget)
1607               {
1608                 gtk_drag_dest_leave (info->widget, context, event->dnd.time);
1609                 info->widget = NULL;
1610               }
1611           }
1612
1613 #ifdef GDK_WINDOWING_X11
1614         /* Hackaround for: http://bugzilla.gnome.org/show_bug.cgi?id=136112
1615          *
1616          * Currently gdk_window_get_position doesn't provide reliable
1617          * information for embedded windows, so we call the much more
1618          * expensive gdk_window_get_origin().
1619          */
1620         if (GTK_IS_PLUG (toplevel))
1621           gdk_window_get_origin (toplevel->window, &tx, &ty);
1622         else
1623 #endif /* GDK_WINDOWING_X11 */
1624           gdk_window_get_position (toplevel->window, &tx, &ty);
1625
1626         data.x = event->dnd.x_root - tx;
1627         data.y = event->dnd.y_root - ty;
1628         data.context = context;
1629         data.info = info;
1630         data.found = FALSE;
1631         data.toplevel = TRUE;
1632         data.callback = (event->type == GDK_DRAG_MOTION) ?
1633           gtk_drag_dest_motion : gtk_drag_dest_drop;
1634         data.time = event->dnd.time;
1635
1636         gtk_drag_find_widget (toplevel, &data);
1637
1638         if (info->widget && !data.found)
1639           {
1640             gtk_drag_dest_leave (info->widget, context, event->dnd.time);
1641             info->widget = NULL;
1642           }
1643
1644         /* Send a reply.
1645          */
1646         if (event->type == GDK_DRAG_MOTION)
1647           {
1648             if (!data.found)
1649               gdk_drag_status (context, 0, event->dnd.time);
1650           }
1651         else if (event->type == GDK_DROP_START && !info->proxy_source)
1652           {
1653             gdk_drop_reply (context, data.found, event->dnd.time);
1654             if ((context->protocol == GDK_DRAG_PROTO_MOTIF) && !data.found)
1655               gtk_drag_finish (context, FALSE, FALSE, event->dnd.time);
1656           }
1657       }
1658       break;
1659
1660     default:
1661       g_assert_not_reached ();
1662     }
1663 }
1664
1665 /**
1666  * gtk_drag_dest_find_target:
1667  * @widget: drag destination widget
1668  * @context: drag context
1669  * @target_list: (allow-none): list of droppable targets, or %NULL to use
1670  *    gtk_drag_dest_get_target_list (@widget).
1671  *
1672  * Looks for a match between @context->targets and the
1673  * @dest_target_list, returning the first matching target, otherwise
1674  * returning %GDK_NONE. @dest_target_list should usually be the return
1675  * value from gtk_drag_dest_get_target_list(), but some widgets may
1676  * have different valid targets for different parts of the widget; in
1677  * that case, they will have to implement a drag_motion handler that
1678  * passes the correct target list to this function.
1679  *
1680  * Return value: first target that the source offers and the dest can accept, or %GDK_NONE
1681  **/
1682 GdkAtom
1683 gtk_drag_dest_find_target (GtkWidget      *widget,
1684                            GdkDragContext *context,
1685                            GtkTargetList  *target_list)
1686 {
1687   GList *tmp_target;
1688   GList *tmp_source = NULL;
1689   GtkWidget *source_widget;
1690
1691   g_return_val_if_fail (GTK_IS_WIDGET (widget), GDK_NONE);
1692   g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), GDK_NONE);
1693   g_return_val_if_fail (!context->is_source, GDK_NONE);
1694
1695
1696   source_widget = gtk_drag_get_source_widget (context);
1697
1698   if (target_list == NULL)
1699     target_list = gtk_drag_dest_get_target_list (widget);
1700
1701   if (target_list == NULL)
1702     return GDK_NONE;
1703
1704   tmp_target = target_list->list;
1705   while (tmp_target)
1706     {
1707       GtkTargetPair *pair = tmp_target->data;
1708       tmp_source = context->targets;
1709       while (tmp_source)
1710         {
1711           if (tmp_source->data == GUINT_TO_POINTER (pair->target))
1712             {
1713               if ((!(pair->flags & GTK_TARGET_SAME_APP) || source_widget) &&
1714                   (!(pair->flags & GTK_TARGET_SAME_WIDGET) || (source_widget == widget)) &&
1715                   (!(pair->flags & GTK_TARGET_OTHER_APP) || !source_widget) &&
1716                   (!(pair->flags & GTK_TARGET_OTHER_WIDGET) || (source_widget != widget)))
1717                 return pair->target;
1718               else
1719                 break;
1720             }
1721           tmp_source = tmp_source->next;
1722         }
1723       tmp_target = tmp_target->next;
1724     }
1725
1726   return GDK_NONE;
1727 }
1728
1729 static void
1730 gtk_drag_selection_received (GtkWidget        *widget,
1731                              GtkSelectionData *selection_data,
1732                              guint             time,
1733                              gpointer          data)
1734 {
1735   GdkDragContext *context;
1736   GtkDragDestInfo *info;
1737   GtkWidget *drop_widget;
1738
1739   drop_widget = data;
1740
1741   context = g_object_get_data (G_OBJECT (widget), "drag-context");
1742   info = gtk_drag_get_dest_info (context, FALSE);
1743
1744   if (info->proxy_data &&
1745       info->proxy_data->target == selection_data->target)
1746     {
1747       gtk_selection_data_set (info->proxy_data,
1748                               selection_data->type,
1749                               selection_data->format,
1750                               selection_data->data,
1751                               selection_data->length);
1752       gtk_main_quit ();
1753       return;
1754     }
1755
1756   if (selection_data->target == gdk_atom_intern_static_string ("DELETE"))
1757     {
1758       gtk_drag_finish (context, TRUE, FALSE, time);
1759     }
1760   else if ((selection_data->target == gdk_atom_intern_static_string ("XmTRANSFER_SUCCESS")) ||
1761            (selection_data->target == gdk_atom_intern_static_string ("XmTRANSFER_FAILURE")))
1762     {
1763       /* Do nothing */
1764     }
1765   else
1766     {
1767       GtkDragDestSite *site;
1768
1769       site = g_object_get_data (G_OBJECT (drop_widget), "gtk-drag-dest");
1770
1771       if (site && site->target_list)
1772         {
1773           guint target_info;
1774
1775           if (gtk_target_list_find (site->target_list,
1776                                     selection_data->target,
1777                                     &target_info))
1778             {
1779               if (!(site->flags & GTK_DEST_DEFAULT_DROP) ||
1780                   selection_data->length >= 0)
1781                 g_signal_emit_by_name (drop_widget,
1782                                        "drag-data-received",
1783                                        context, info->drop_x, info->drop_y,
1784                                        selection_data,
1785                                        target_info, time);
1786             }
1787         }
1788       else
1789         {
1790           g_signal_emit_by_name (drop_widget,
1791                                  "drag-data-received",
1792                                  context, info->drop_x, info->drop_y,
1793                                  selection_data,
1794                                  0, time);
1795         }
1796
1797       if (site && site->flags & GTK_DEST_DEFAULT_DROP)
1798         {
1799
1800           gtk_drag_finish (context,
1801                            (selection_data->length >= 0),
1802                            (context->action == GDK_ACTION_MOVE),
1803                            time);
1804         }
1805
1806       g_object_unref (drop_widget);
1807     }
1808
1809   g_signal_handlers_disconnect_by_func (widget,
1810                                         gtk_drag_selection_received,
1811                                         data);
1812
1813   g_object_set_data (G_OBJECT (widget), I_("drag-context"), NULL);
1814   g_object_unref (context);
1815
1816   gtk_drag_release_ipc_widget (widget);
1817 }
1818
1819 static void
1820 prepend_and_ref_widget (GtkWidget *widget,
1821                         gpointer   data)
1822 {
1823   GSList **slist_p = data;
1824
1825   *slist_p = g_slist_prepend (*slist_p, g_object_ref (widget));
1826 }
1827
1828 /*************************************************************
1829  * gtk_drag_find_widget:
1830  *     Recursive callback used to locate widgets for
1831  *     DRAG_MOTION and DROP_START events.
1832  *   arguments:
1833  *
1834  *   results:
1835  *************************************************************/
1836
1837 static void
1838 gtk_drag_find_widget (GtkWidget       *widget,
1839                       GtkDragFindData *data)
1840 {
1841   GtkAllocation new_allocation;
1842   gint allocation_to_window_x = 0;
1843   gint allocation_to_window_y = 0;
1844   gint x_offset = 0;
1845   gint y_offset = 0;
1846
1847   if (data->found || !GTK_WIDGET_MAPPED (widget) || !gtk_widget_get_sensitive (widget))
1848     return;
1849
1850   /* Note that in the following code, we only count the
1851    * position as being inside a WINDOW widget if it is inside
1852    * widget->window; points that are outside of widget->window
1853    * but within the allocation are not counted. This is consistent
1854    * with the way we highlight drag targets.
1855    *
1856    * data->x,y are relative to widget->parent->window (if
1857    * widget is not a toplevel, widget->window otherwise).
1858    * We compute the allocation of widget in the same coordinates,
1859    * clipping to widget->window, and all intermediate
1860    * windows. If data->x,y is inside that, then we translate
1861    * our coordinates to be relative to widget->window and
1862    * recurse.
1863    */
1864   new_allocation = widget->allocation;
1865
1866   if (widget->parent)
1867     {
1868       gint tx, ty;
1869       GdkWindow *window = widget->window;
1870
1871       /* Compute the offset from allocation-relative to
1872        * window-relative coordinates.
1873        */
1874       allocation_to_window_x = widget->allocation.x;
1875       allocation_to_window_y = widget->allocation.y;
1876
1877       if (gtk_widget_get_has_window (widget))
1878         {
1879           /* The allocation is relative to the parent window for
1880            * window widgets, not to widget->window.
1881            */
1882           gdk_window_get_position (window, &tx, &ty);
1883
1884           allocation_to_window_x -= tx;
1885           allocation_to_window_y -= ty;
1886         }
1887
1888       new_allocation.x = 0 + allocation_to_window_x;
1889       new_allocation.y = 0 + allocation_to_window_y;
1890
1891       while (window && window != widget->parent->window)
1892         {
1893           GdkRectangle window_rect = { 0, 0, 0, 0 };
1894
1895           gdk_drawable_get_size (window, &window_rect.width, &window_rect.height);
1896
1897           gdk_rectangle_intersect (&new_allocation, &window_rect, &new_allocation);
1898
1899           gdk_window_get_position (window, &tx, &ty);
1900           new_allocation.x += tx;
1901           x_offset += tx;
1902           new_allocation.y += ty;
1903           y_offset += ty;
1904
1905           window = gdk_window_get_parent (window);
1906         }
1907
1908       if (!window)              /* Window and widget heirarchies didn't match. */
1909         return;
1910     }
1911
1912   if (data->toplevel ||
1913       ((data->x >= new_allocation.x) && (data->y >= new_allocation.y) &&
1914        (data->x < new_allocation.x + new_allocation.width) &&
1915        (data->y < new_allocation.y + new_allocation.height)))
1916     {
1917       /* First, check if the drag is in a valid drop site in
1918        * one of our children
1919        */
1920       if (GTK_IS_CONTAINER (widget))
1921         {
1922           GtkDragFindData new_data = *data;
1923           GSList *children = NULL;
1924           GSList *tmp_list;
1925
1926           new_data.x -= x_offset;
1927           new_data.y -= y_offset;
1928           new_data.found = FALSE;
1929           new_data.toplevel = FALSE;
1930
1931           /* need to reference children temporarily in case the
1932            * ::drag-motion/::drag-drop callbacks change the widget hierarchy.
1933            */
1934           gtk_container_forall (GTK_CONTAINER (widget), prepend_and_ref_widget, &children);
1935           for (tmp_list = children; tmp_list; tmp_list = tmp_list->next)
1936             {
1937               if (!new_data.found && gtk_widget_is_drawable (tmp_list->data))
1938                 gtk_drag_find_widget (tmp_list->data, &new_data);
1939               g_object_unref (tmp_list->data);
1940             }
1941           g_slist_free (children);
1942
1943           data->found = new_data.found;
1944         }
1945
1946       /* If not, and this widget is registered as a drop site, check to
1947        * emit "drag-motion" to check if we are actually in
1948        * a drop site.
1949        */
1950       if (!data->found &&
1951           g_object_get_data (G_OBJECT (widget), "gtk-drag-dest"))
1952         {
1953           data->found = data->callback (widget,
1954                                         data->context,
1955                                         data->x - x_offset - allocation_to_window_x,
1956                                         data->y - y_offset - allocation_to_window_y,
1957                                         data->time);
1958           /* If so, send a "drag-leave" to the last widget */
1959           if (data->found)
1960             {
1961               if (data->info->widget && data->info->widget != widget)
1962                 {
1963                   gtk_drag_dest_leave (data->info->widget, data->context, data->time);
1964                 }
1965               data->info->widget = widget;
1966             }
1967         }
1968     }
1969 }
1970
1971 static void
1972 gtk_drag_proxy_begin (GtkWidget       *widget,
1973                       GtkDragDestInfo *dest_info,
1974                       guint32          time)
1975 {
1976   GtkDragSourceInfo *source_info;
1977   GList *tmp_list;
1978   GdkDragContext *context;
1979   GtkWidget *ipc_widget;
1980
1981   if (dest_info->proxy_source)
1982     {
1983       gdk_drag_abort (dest_info->proxy_source->context, time);
1984       gtk_drag_source_info_destroy (dest_info->proxy_source);
1985       dest_info->proxy_source = NULL;
1986     }
1987
1988   ipc_widget = gtk_drag_get_ipc_widget (widget);
1989   context = gdk_drag_begin (ipc_widget->window,
1990                             dest_info->context->targets);
1991
1992   source_info = gtk_drag_get_source_info (context, TRUE);
1993
1994   source_info->ipc_widget = ipc_widget;
1995   source_info->widget = g_object_ref (widget);
1996
1997   source_info->target_list = gtk_target_list_new (NULL, 0);
1998   tmp_list = dest_info->context->targets;
1999   while (tmp_list)
2000     {
2001       gtk_target_list_add (source_info->target_list,
2002                            GDK_POINTER_TO_ATOM (tmp_list->data), 0, 0);
2003       tmp_list = tmp_list->next;
2004     }
2005
2006   source_info->proxy_dest = dest_info;
2007
2008   g_signal_connect (ipc_widget,
2009                     "selection-get",
2010                     G_CALLBACK (gtk_drag_selection_get),
2011                     source_info);
2012
2013   dest_info->proxy_source = source_info;
2014 }
2015
2016 static void
2017 gtk_drag_dest_info_destroy (gpointer data)
2018 {
2019   GtkDragDestInfo *info = data;
2020
2021   g_free (info);
2022 }
2023
2024 static GtkDragDestInfo *
2025 gtk_drag_get_dest_info (GdkDragContext *context,
2026                         gboolean        create)
2027 {
2028   GtkDragDestInfo *info;
2029   static GQuark info_quark = 0;
2030   if (!info_quark)
2031     info_quark = g_quark_from_static_string ("gtk-dest-info");
2032
2033   info = g_object_get_qdata (G_OBJECT (context), info_quark);
2034   if (!info && create)
2035     {
2036       info = g_new (GtkDragDestInfo, 1);
2037       info->widget = NULL;
2038       info->context = context;
2039       info->proxy_source = NULL;
2040       info->proxy_data = NULL;
2041       info->dropped = FALSE;
2042       info->proxy_drop_wait = FALSE;
2043       g_object_set_qdata_full (G_OBJECT (context), info_quark,
2044                                info, gtk_drag_dest_info_destroy);
2045     }
2046
2047   return info;
2048 }
2049
2050 static GQuark dest_info_quark = 0;
2051
2052 static GtkDragSourceInfo *
2053 gtk_drag_get_source_info (GdkDragContext *context,
2054                           gboolean        create)
2055 {
2056   GtkDragSourceInfo *info;
2057   if (!dest_info_quark)
2058     dest_info_quark = g_quark_from_static_string ("gtk-source-info");
2059
2060   info = g_object_get_qdata (G_OBJECT (context), dest_info_quark);
2061   if (!info && create)
2062     {
2063       info = g_new0 (GtkDragSourceInfo, 1);
2064       info->context = context;
2065       g_object_set_qdata (G_OBJECT (context), dest_info_quark, info);
2066     }
2067
2068   return info;
2069 }
2070
2071 static void
2072 gtk_drag_clear_source_info (GdkDragContext *context)
2073 {
2074   g_object_set_qdata (G_OBJECT (context), dest_info_quark, NULL);
2075 }
2076
2077 static void
2078 gtk_drag_dest_realized (GtkWidget *widget)
2079 {
2080   GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
2081
2082   if (gtk_widget_is_toplevel (toplevel))
2083     gdk_window_register_dnd (toplevel->window);
2084 }
2085
2086 static void
2087 gtk_drag_dest_hierarchy_changed (GtkWidget *widget,
2088                                  GtkWidget *previous_toplevel)
2089 {
2090   GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
2091
2092   if (gtk_widget_is_toplevel (toplevel) && GTK_WIDGET_REALIZED (toplevel))
2093     gdk_window_register_dnd (toplevel->window);
2094 }
2095
2096 static void
2097 gtk_drag_dest_site_destroy (gpointer data)
2098 {
2099   GtkDragDestSite *site = data;
2100
2101   if (site->proxy_window)
2102     g_object_unref (site->proxy_window);
2103
2104   if (site->target_list)
2105     gtk_target_list_unref (site->target_list);
2106
2107   g_free (site);
2108 }
2109
2110 /*
2111  * Default drag handlers
2112  */
2113 static void
2114 gtk_drag_dest_leave (GtkWidget      *widget,
2115                      GdkDragContext *context,
2116                      guint           time)
2117 {
2118   GtkDragDestSite *site;
2119
2120   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
2121   g_return_if_fail (site != NULL);
2122
2123   if (site->do_proxy)
2124     {
2125       GtkDragDestInfo *info = gtk_drag_get_dest_info (context, FALSE);
2126
2127       if (info->proxy_source && info->proxy_source->widget == widget && !info->dropped)
2128         {
2129           gdk_drag_abort (info->proxy_source->context, time);
2130           gtk_drag_source_info_destroy (info->proxy_source);
2131           info->proxy_source = NULL;
2132         }
2133
2134       return;
2135     }
2136   else
2137     {
2138       if ((site->flags & GTK_DEST_DEFAULT_HIGHLIGHT) && site->have_drag)
2139         gtk_drag_unhighlight (widget);
2140
2141       if (!(site->flags & GTK_DEST_DEFAULT_MOTION) || site->have_drag ||
2142           site->track_motion)
2143         g_signal_emit_by_name (widget, "drag-leave", context, time);
2144
2145       site->have_drag = FALSE;
2146     }
2147 }
2148
2149 static gboolean
2150 gtk_drag_dest_motion (GtkWidget      *widget,
2151                       GdkDragContext *context,
2152                       gint            x,
2153                       gint            y,
2154                       guint           time)
2155 {
2156   GtkDragDestSite *site;
2157   GdkDragAction action = 0;
2158   gboolean retval;
2159
2160   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
2161   g_return_val_if_fail (site != NULL, FALSE);
2162
2163   if (site->do_proxy)
2164     {
2165       GdkAtom selection;
2166       GdkEvent *current_event;
2167       GdkWindow *dest_window;
2168       GdkDragProtocol proto;
2169
2170       GtkDragDestInfo *info = gtk_drag_get_dest_info (context, FALSE);
2171
2172       if (!info->proxy_source || info->proxy_source->widget != widget)
2173         gtk_drag_proxy_begin (widget, info, time);
2174
2175       current_event = gtk_get_current_event ();
2176
2177       if (site->proxy_window)
2178         {
2179           dest_window = site->proxy_window;
2180           proto = site->proxy_protocol;
2181         }
2182       else
2183         {
2184           gdk_drag_find_window_for_screen (info->proxy_source->context,
2185                                            NULL,
2186                                            gdk_drawable_get_screen (current_event->dnd.window),
2187                                            current_event->dnd.x_root,
2188                                            current_event->dnd.y_root,
2189                                            &dest_window, &proto);
2190         }
2191
2192       gdk_drag_motion (info->proxy_source->context,
2193                        dest_window, proto,
2194                        current_event->dnd.x_root,
2195                        current_event->dnd.y_root,
2196                        context->suggested_action,
2197                        context->actions, time);
2198
2199       if (!site->proxy_window && dest_window)
2200         g_object_unref (dest_window);
2201
2202       selection = gdk_drag_get_selection (info->proxy_source->context);
2203       if (selection &&
2204           selection != gdk_drag_get_selection (info->context))
2205         gtk_drag_source_check_selection (info->proxy_source, selection, time);
2206
2207       gdk_event_free (current_event);
2208
2209       return TRUE;
2210     }
2211
2212   if (site->track_motion || site->flags & GTK_DEST_DEFAULT_MOTION)
2213     {
2214       if (context->suggested_action & site->actions)
2215         action = context->suggested_action;
2216       else
2217         {
2218           gint i;
2219
2220           for (i = 0; i < 8; i++)
2221             {
2222               if ((site->actions & (1 << i)) &&
2223                   (context->actions & (1 << i)))
2224                 {
2225                   action = (1 << i);
2226                   break;
2227                 }
2228             }
2229         }
2230
2231       if (action && gtk_drag_dest_find_target (widget, context, NULL))
2232         {
2233           if (!site->have_drag)
2234             {
2235               site->have_drag = TRUE;
2236               if (site->flags & GTK_DEST_DEFAULT_HIGHLIGHT)
2237                 gtk_drag_highlight (widget);
2238             }
2239
2240           gdk_drag_status (context, action, time);
2241         }
2242       else
2243         {
2244           gdk_drag_status (context, 0, time);
2245           if (!site->track_motion)
2246             return TRUE;
2247         }
2248     }
2249
2250   g_signal_emit_by_name (widget, "drag-motion",
2251                          context, x, y, time, &retval);
2252
2253   return (site->flags & GTK_DEST_DEFAULT_MOTION) ? TRUE : retval;
2254 }
2255
2256 static gboolean
2257 gtk_drag_dest_drop (GtkWidget        *widget,
2258                     GdkDragContext   *context,
2259                     gint              x,
2260                     gint              y,
2261                     guint             time)
2262 {
2263   GtkDragDestSite *site;
2264   GtkDragDestInfo *info;
2265
2266   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
2267   g_return_val_if_fail (site != NULL, FALSE);
2268
2269   info = gtk_drag_get_dest_info (context, FALSE);
2270   g_return_val_if_fail (info != NULL, FALSE);
2271
2272   info->drop_x = x;
2273   info->drop_y = y;
2274
2275   if (site->do_proxy)
2276     {
2277       if (info->proxy_source ||
2278           (info->context->protocol == GDK_DRAG_PROTO_ROOTWIN))
2279         {
2280           gtk_drag_drop (info->proxy_source, time);
2281         }
2282       else
2283         {
2284           /* We need to synthesize a motion event, wait for a status,
2285            * and, if we get a good one, do a drop.
2286            */
2287
2288           GdkEvent *current_event;
2289           GdkAtom selection;
2290           GdkWindow *dest_window;
2291           GdkDragProtocol proto;
2292
2293           gtk_drag_proxy_begin (widget, info, time);
2294           info->proxy_drop_wait = TRUE;
2295           info->proxy_drop_time = time;
2296
2297           current_event = gtk_get_current_event ();
2298
2299           if (site->proxy_window)
2300             {
2301               dest_window = site->proxy_window;
2302               proto = site->proxy_protocol;
2303             }
2304           else
2305             {
2306               gdk_drag_find_window_for_screen (info->proxy_source->context,
2307                                                NULL,
2308                                                gdk_drawable_get_screen (current_event->dnd.window),
2309                                                current_event->dnd.x_root,
2310                                                current_event->dnd.y_root,
2311                                                &dest_window, &proto);
2312             }
2313
2314           gdk_drag_motion (info->proxy_source->context,
2315                            dest_window, proto,
2316                            current_event->dnd.x_root,
2317                            current_event->dnd.y_root,
2318                            context->suggested_action,
2319                            context->actions, time);
2320
2321           if (!site->proxy_window && dest_window)
2322             g_object_unref (dest_window);
2323
2324           selection = gdk_drag_get_selection (info->proxy_source->context);
2325           if (selection &&
2326               selection != gdk_drag_get_selection (info->context))
2327             gtk_drag_source_check_selection (info->proxy_source, selection, time);
2328
2329           gdk_event_free (current_event);
2330         }
2331
2332       return TRUE;
2333     }
2334   else
2335     {
2336       gboolean retval;
2337
2338       if (site->flags & GTK_DEST_DEFAULT_DROP)
2339         {
2340           GdkAtom target = gtk_drag_dest_find_target (widget, context, NULL);
2341
2342           if (target == GDK_NONE)
2343             {
2344               gtk_drag_finish (context, FALSE, FALSE, time);
2345               return TRUE;
2346             }
2347           else
2348             gtk_drag_get_data (widget, context, target, time);
2349         }
2350
2351       g_signal_emit_by_name (widget, "drag-drop",
2352                              context, x, y, time, &retval);
2353
2354       return (site->flags & GTK_DEST_DEFAULT_DROP) ? TRUE : retval;
2355     }
2356 }
2357
2358 /***************
2359  * Source side *
2360  ***************/
2361
2362 /* Like GtkDragBegin, but also takes a GtkDragSourceSite,
2363  * so that we can set the icon from the source site information
2364  */
2365 static GdkDragContext *
2366 gtk_drag_begin_internal (GtkWidget         *widget,
2367                          GtkDragSourceSite *site,
2368                          GtkTargetList     *target_list,
2369                          GdkDragAction      actions,
2370                          gint               button,
2371                          GdkEvent          *event)
2372 {
2373   GtkDragSourceInfo *info;
2374   GList *targets = NULL;
2375   GList *tmp_list;
2376   guint32 time = GDK_CURRENT_TIME;
2377   GdkDragAction possible_actions, suggested_action;
2378   GdkDragContext *context;
2379   GtkWidget *ipc_widget;
2380   GdkCursor *cursor;
2381
2382   ipc_widget = gtk_drag_get_ipc_widget (widget);
2383
2384   gtk_drag_get_event_actions (event, button, actions,
2385                               &suggested_action, &possible_actions);
2386
2387   cursor = gtk_drag_get_cursor (gtk_widget_get_display (widget),
2388                                 suggested_action,
2389                                 NULL);
2390
2391   if (event)
2392     time = gdk_event_get_time (event);
2393
2394   if (gdk_pointer_grab (ipc_widget->window, FALSE,
2395                         GDK_POINTER_MOTION_MASK |
2396                         GDK_BUTTON_RELEASE_MASK, NULL,
2397                         cursor, time) != GDK_GRAB_SUCCESS)
2398     {
2399       gtk_drag_release_ipc_widget (ipc_widget);
2400       return NULL;
2401     }
2402
2403   grab_dnd_keys (ipc_widget, time);
2404
2405   /* We use a GTK grab here to override any grabs that the widget
2406    * we are dragging from might have held
2407    */
2408   gtk_grab_add (ipc_widget);
2409
2410   tmp_list = g_list_last (target_list->list);
2411   while (tmp_list)
2412     {
2413       GtkTargetPair *pair = tmp_list->data;
2414       targets = g_list_prepend (targets,
2415                                 GINT_TO_POINTER (pair->target));
2416       tmp_list = tmp_list->prev;
2417     }
2418
2419   source_widgets = g_slist_prepend (source_widgets, ipc_widget);
2420
2421   context = gdk_drag_begin (ipc_widget->window, targets);
2422   g_list_free (targets);
2423
2424   info = gtk_drag_get_source_info (context, TRUE);
2425
2426   info->ipc_widget = ipc_widget;
2427   g_object_set_data (G_OBJECT (info->ipc_widget), I_("gtk-info"), info);
2428
2429   info->widget = g_object_ref (widget);
2430
2431   info->button = button;
2432   info->cursor = cursor;
2433   info->target_list = target_list;
2434   gtk_target_list_ref (target_list);
2435
2436   info->possible_actions = actions;
2437
2438   info->status = GTK_DRAG_STATUS_DRAG;
2439   info->last_event = NULL;
2440   info->selections = NULL;
2441   info->icon_window = NULL;
2442   info->destroy_icon = FALSE;
2443
2444   /* Set cur_x, cur_y here so if the "drag-begin" signal shows
2445    * the drag icon, it will be in the right place
2446    */
2447   if (event && event->type == GDK_MOTION_NOTIFY)
2448     {
2449       info->cur_screen = gtk_widget_get_screen (widget);
2450       info->cur_x = event->motion.x_root;
2451       info->cur_y = event->motion.y_root;
2452     }
2453   else
2454     {
2455       gdk_display_get_pointer (gtk_widget_get_display (widget),
2456                                &info->cur_screen, &info->cur_x, &info->cur_y, NULL);
2457     }
2458
2459   g_signal_emit_by_name (widget, "drag-begin", info->context);
2460
2461   /* Ensure that we have an icon before we start the drag; the
2462    * application may have set one in ::drag_begin, or it may
2463    * not have set one.
2464    */
2465   if (!info->icon_window && !info->icon_pixbuf)
2466     {
2467       if (!site || site->icon_type == GTK_IMAGE_EMPTY)
2468         gtk_drag_set_icon_default (context);
2469       else
2470         switch (site->icon_type)
2471           {
2472           case GTK_IMAGE_PIXMAP:
2473             gtk_drag_set_icon_pixmap (context,
2474                                       site->colormap,
2475                                       site->icon_data.pixmap.pixmap,
2476                                       site->icon_mask,
2477                                       -2, -2);
2478             break;
2479           case GTK_IMAGE_PIXBUF:
2480             gtk_drag_set_icon_pixbuf (context,
2481                                       site->icon_data.pixbuf.pixbuf,
2482                                       -2, -2);
2483             break;
2484           case GTK_IMAGE_STOCK:
2485             gtk_drag_set_icon_stock (context,
2486                                      site->icon_data.stock.stock_id,
2487                                      -2, -2);
2488             break;
2489           case GTK_IMAGE_ICON_NAME:
2490             gtk_drag_set_icon_name (context,
2491                                     site->icon_data.name.icon_name,
2492                                     -2, -2);
2493             break;
2494           case GTK_IMAGE_EMPTY:
2495           default:
2496             g_assert_not_reached();
2497             break;
2498           }
2499     }
2500
2501   /* We need to composite the icon into the cursor, if we are
2502    * not using an icon window.
2503    */
2504   if (info->icon_pixbuf)
2505     {
2506       cursor = gtk_drag_get_cursor (gtk_widget_get_display (widget),
2507                                     suggested_action,
2508                                     info);
2509
2510       if (cursor != info->cursor)
2511         {
2512           gdk_pointer_grab (widget->window, FALSE,
2513                             GDK_POINTER_MOTION_MASK |
2514                             GDK_BUTTON_RELEASE_MASK,
2515                             NULL,
2516                             cursor, time);
2517           info->cursor = cursor;
2518         }
2519     }
2520
2521   if (event && event->type == GDK_MOTION_NOTIFY)
2522     gtk_drag_motion_cb (info->ipc_widget, (GdkEventMotion *)event, info);
2523   else
2524     gtk_drag_update (info, info->cur_screen, info->cur_x, info->cur_y, event);
2525
2526   info->start_x = info->cur_x;
2527   info->start_y = info->cur_y;
2528
2529   g_signal_connect (info->ipc_widget, "grab-broken-event",
2530                     G_CALLBACK (gtk_drag_grab_broken_event_cb), info);
2531   g_signal_connect (info->ipc_widget, "grab-notify",
2532                     G_CALLBACK (gtk_drag_grab_notify_cb), info);
2533   g_signal_connect (info->ipc_widget, "button-release-event",
2534                     G_CALLBACK (gtk_drag_button_release_cb), info);
2535   g_signal_connect (info->ipc_widget, "motion-notify-event",
2536                     G_CALLBACK (gtk_drag_motion_cb), info);
2537   g_signal_connect (info->ipc_widget, "key-press-event",
2538                     G_CALLBACK (gtk_drag_key_cb), info);
2539   g_signal_connect (info->ipc_widget, "key-release-event",
2540                     G_CALLBACK (gtk_drag_key_cb), info);
2541   g_signal_connect (info->ipc_widget, "selection-get",
2542                     G_CALLBACK (gtk_drag_selection_get), info);
2543
2544   info->have_grab = TRUE;
2545   info->grab_time = time;
2546
2547   return info->context;
2548 }
2549
2550 /**
2551  * gtk_drag_begin:
2552  * @widget: the source widget.
2553  * @targets: The targets (data formats) in which the
2554  *    source can provide the data.
2555  * @actions: A bitmask of the allowed drag actions for this drag.
2556  * @button: The button the user clicked to start the drag.
2557  * @event: The event that triggered the start of the drag.
2558  *
2559  * Initiates a drag on the source side. The function
2560  * only needs to be used when the application is
2561  * starting drags itself, and is not needed when
2562  * gtk_drag_source_set() is used.
2563  *
2564  * Return value: the context for this drag.
2565  **/
2566 GdkDragContext *
2567 gtk_drag_begin (GtkWidget         *widget,
2568                 GtkTargetList     *targets,
2569                 GdkDragAction      actions,
2570                 gint               button,
2571                 GdkEvent          *event)
2572 {
2573   g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
2574   g_return_val_if_fail (GTK_WIDGET_REALIZED (widget), NULL);
2575   g_return_val_if_fail (targets != NULL, NULL);
2576
2577   return gtk_drag_begin_internal (widget, NULL, targets,
2578                                   actions, button, event);
2579 }
2580
2581 /*************************************************************
2582  * gtk_drag_source_set:
2583  *     Register a drop site, and possibly add default behaviors.
2584  *   arguments:
2585  *     widget:
2586  *     start_button_mask: Mask of allowed buttons to start drag
2587  *     targets:           Table of targets for this source
2588  *     n_targets:
2589  *     actions:           Actions allowed for this source
2590  *   results:
2591  *************************************************************/
2592
2593 void
2594 gtk_drag_source_set (GtkWidget            *widget,
2595                      GdkModifierType       start_button_mask,
2596                      const GtkTargetEntry *targets,
2597                      gint                  n_targets,
2598                      GdkDragAction         actions)
2599 {
2600   GtkDragSourceSite *site;
2601
2602   g_return_if_fail (GTK_IS_WIDGET (widget));
2603
2604   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
2605
2606   gtk_widget_add_events (widget,
2607                          gtk_widget_get_events (widget) |
2608                          GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
2609                          GDK_BUTTON_MOTION_MASK);
2610
2611   if (site)
2612     {
2613       if (site->target_list)
2614         gtk_target_list_unref (site->target_list);
2615     }
2616   else
2617     {
2618       site = g_new0 (GtkDragSourceSite, 1);
2619
2620       site->icon_type = GTK_IMAGE_EMPTY;
2621
2622       g_signal_connect (widget, "button-press-event",
2623                         G_CALLBACK (gtk_drag_source_event_cb),
2624                         site);
2625       g_signal_connect (widget, "button-release-event",
2626                         G_CALLBACK (gtk_drag_source_event_cb),
2627                         site);
2628       g_signal_connect (widget, "motion-notify-event",
2629                         G_CALLBACK (gtk_drag_source_event_cb),
2630                         site);
2631
2632       g_object_set_data_full (G_OBJECT (widget),
2633                               I_("gtk-site-data"),
2634                               site, gtk_drag_source_site_destroy);
2635     }
2636
2637   site->start_button_mask = start_button_mask;
2638
2639   site->target_list = gtk_target_list_new (targets, n_targets);
2640
2641   site->actions = actions;
2642 }
2643
2644 /*************************************************************
2645  * gtk_drag_source_unset
2646  *     Unregister this widget as a drag source.
2647  *   arguments:
2648  *     widget:
2649  *   results:
2650  *************************************************************/
2651
2652 void
2653 gtk_drag_source_unset (GtkWidget        *widget)
2654 {
2655   GtkDragSourceSite *site;
2656
2657   g_return_if_fail (GTK_IS_WIDGET (widget));
2658
2659   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
2660
2661   if (site)
2662     {
2663       g_signal_handlers_disconnect_by_func (widget,
2664                                             gtk_drag_source_event_cb,
2665                                             site);
2666       g_object_set_data (G_OBJECT (widget), I_("gtk-site-data"), NULL);
2667     }
2668 }
2669
2670 /**
2671  * gtk_drag_source_get_target_list:
2672  * @widget: a #GtkWidget
2673  *
2674  * Gets the list of targets this widget can provide for
2675  * drag-and-drop.
2676  *
2677  * Return value: the #GtkTargetList, or %NULL if none
2678  *
2679  * Since: 2.4
2680  **/
2681 GtkTargetList *
2682 gtk_drag_source_get_target_list (GtkWidget *widget)
2683 {
2684   GtkDragSourceSite *site;
2685
2686   g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
2687
2688   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
2689
2690   return site ? site->target_list : NULL;
2691 }
2692
2693 /**
2694  * gtk_drag_source_set_target_list:
2695  * @widget: a #GtkWidget that's a drag source
2696  * @target_list: (allow-none): list of draggable targets, or %NULL for none
2697  *
2698  * Changes the target types that this widget offers for drag-and-drop.
2699  * The widget must first be made into a drag source with
2700  * gtk_drag_source_set().
2701  *
2702  * Since: 2.4
2703  **/
2704 void
2705 gtk_drag_source_set_target_list (GtkWidget     *widget,
2706                                  GtkTargetList *target_list)
2707 {
2708   GtkDragSourceSite *site;
2709
2710   g_return_if_fail (GTK_IS_WIDGET (widget));
2711
2712   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
2713   if (site == NULL)
2714     {
2715       g_warning ("gtk_drag_source_set_target_list() requires the widget "
2716                  "to already be a drag source.");
2717       return;
2718     }
2719
2720   if (target_list)
2721     gtk_target_list_ref (target_list);
2722
2723   if (site->target_list)
2724     gtk_target_list_unref (site->target_list);
2725
2726   site->target_list = target_list;
2727 }
2728
2729 /**
2730  * gtk_drag_source_add_text_targets:
2731  * @widget: a #GtkWidget that's is a drag source
2732  *
2733  * Add the text targets supported by #GtkSelection to
2734  * the target list of the drag source.  The targets
2735  * are added with @info = 0. If you need another value,
2736  * use gtk_target_list_add_text_targets() and
2737  * gtk_drag_source_set_target_list().
2738  *
2739  * Since: 2.6
2740  **/
2741 void
2742 gtk_drag_source_add_text_targets (GtkWidget *widget)
2743 {
2744   GtkTargetList *target_list;
2745
2746   target_list = gtk_drag_source_get_target_list (widget);
2747   if (target_list)
2748     gtk_target_list_ref (target_list);
2749   else
2750     target_list = gtk_target_list_new (NULL, 0);
2751   gtk_target_list_add_text_targets (target_list, 0);
2752   gtk_drag_source_set_target_list (widget, target_list);
2753   gtk_target_list_unref (target_list);
2754 }
2755
2756 /**
2757  * gtk_drag_source_add_image_targets:
2758  * @widget: a #GtkWidget that's is a drag source
2759  *
2760  * Add the writable image targets supported by #GtkSelection to
2761  * the target list of the drag source. The targets
2762  * are added with @info = 0. If you need another value,
2763  * use gtk_target_list_add_image_targets() and
2764  * gtk_drag_source_set_target_list().
2765  *
2766  * Since: 2.6
2767  **/
2768 void
2769 gtk_drag_source_add_image_targets (GtkWidget *widget)
2770 {
2771   GtkTargetList *target_list;
2772
2773   target_list = gtk_drag_source_get_target_list (widget);
2774   if (target_list)
2775     gtk_target_list_ref (target_list);
2776   else
2777     target_list = gtk_target_list_new (NULL, 0);
2778   gtk_target_list_add_image_targets (target_list, 0, TRUE);
2779   gtk_drag_source_set_target_list (widget, target_list);
2780   gtk_target_list_unref (target_list);
2781 }
2782
2783 /**
2784  * gtk_drag_source_add_uri_targets:
2785  * @widget: a #GtkWidget that's is a drag source
2786  *
2787  * Add the URI targets supported by #GtkSelection to
2788  * the target list of the drag source.  The targets
2789  * are added with @info = 0. If you need another value,
2790  * use gtk_target_list_add_uri_targets() and
2791  * gtk_drag_source_set_target_list().
2792  *
2793  * Since: 2.6
2794  **/
2795 void
2796 gtk_drag_source_add_uri_targets (GtkWidget *widget)
2797 {
2798   GtkTargetList *target_list;
2799
2800   target_list = gtk_drag_source_get_target_list (widget);
2801   if (target_list)
2802     gtk_target_list_ref (target_list);
2803   else
2804     target_list = gtk_target_list_new (NULL, 0);
2805   gtk_target_list_add_uri_targets (target_list, 0);
2806   gtk_drag_source_set_target_list (widget, target_list);
2807   gtk_target_list_unref (target_list);
2808 }
2809
2810 static void
2811 gtk_drag_source_unset_icon (GtkDragSourceSite *site)
2812 {
2813   switch (site->icon_type)
2814     {
2815     case GTK_IMAGE_EMPTY:
2816       break;
2817     case GTK_IMAGE_PIXMAP:
2818       if (site->icon_data.pixmap.pixmap)
2819         g_object_unref (site->icon_data.pixmap.pixmap);
2820       if (site->icon_mask)
2821         g_object_unref (site->icon_mask);
2822       break;
2823     case GTK_IMAGE_PIXBUF:
2824       g_object_unref (site->icon_data.pixbuf.pixbuf);
2825       break;
2826     case GTK_IMAGE_STOCK:
2827       g_free (site->icon_data.stock.stock_id);
2828       break;
2829     case GTK_IMAGE_ICON_NAME:
2830       g_free (site->icon_data.name.icon_name);
2831       break;
2832     default:
2833       g_assert_not_reached();
2834       break;
2835     }
2836   site->icon_type = GTK_IMAGE_EMPTY;
2837
2838   if (site->colormap)
2839     g_object_unref (site->colormap);
2840   site->colormap = NULL;
2841 }
2842
2843 /**
2844  * gtk_drag_source_set_icon:
2845  * @widget: a #GtkWidget
2846  * @colormap: the colormap of the icon
2847  * @pixmap: the image data for the icon
2848  * @mask: (allow-none): the transparency mask for an image.
2849  *
2850  * Sets the icon that will be used for drags from a particular widget
2851  * from a pixmap/mask. GTK+ retains references for the arguments, and
2852  * will release them when they are no longer needed.
2853  * Use gtk_drag_source_set_icon_pixbuf() instead.
2854  **/
2855 void
2856 gtk_drag_source_set_icon (GtkWidget     *widget,
2857                           GdkColormap   *colormap,
2858                           GdkPixmap     *pixmap,
2859                           GdkBitmap     *mask)
2860 {
2861   GtkDragSourceSite *site;
2862
2863   g_return_if_fail (GTK_IS_WIDGET (widget));
2864   g_return_if_fail (GDK_IS_COLORMAP (colormap));
2865   g_return_if_fail (GDK_IS_PIXMAP (pixmap));
2866   g_return_if_fail (!mask || GDK_IS_PIXMAP (mask));
2867
2868   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
2869   g_return_if_fail (site != NULL);
2870
2871   g_object_ref (colormap);
2872   g_object_ref (pixmap);
2873   if (mask)
2874     g_object_ref (mask);
2875
2876   gtk_drag_source_unset_icon (site);
2877
2878   site->icon_type = GTK_IMAGE_PIXMAP;
2879
2880   site->icon_data.pixmap.pixmap = pixmap;
2881   site->icon_mask = mask;
2882   site->colormap = colormap;
2883 }
2884
2885 /**
2886  * gtk_drag_source_set_icon_pixbuf:
2887  * @widget: a #GtkWidget
2888  * @pixbuf: the #GdkPixbuf for the drag icon
2889  *
2890  * Sets the icon that will be used for drags from a particular widget
2891  * from a #GdkPixbuf. GTK+ retains a reference for @pixbuf and will
2892  * release it when it is no longer needed.
2893  **/
2894 void
2895 gtk_drag_source_set_icon_pixbuf (GtkWidget   *widget,
2896                                  GdkPixbuf   *pixbuf)
2897 {
2898   GtkDragSourceSite *site;
2899
2900   g_return_if_fail (GTK_IS_WIDGET (widget));
2901   g_return_if_fail (GDK_IS_PIXBUF (pixbuf));
2902
2903   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
2904   g_return_if_fail (site != NULL);
2905   g_object_ref (pixbuf);
2906
2907   gtk_drag_source_unset_icon (site);
2908
2909   site->icon_type = GTK_IMAGE_PIXBUF;
2910   site->icon_data.pixbuf.pixbuf = pixbuf;
2911 }
2912
2913 /**
2914  * gtk_drag_source_set_icon_stock:
2915  * @widget: a #GtkWidget
2916  * @stock_id: the ID of the stock icon to use
2917  *
2918  * Sets the icon that will be used for drags from a particular source
2919  * to a stock icon.
2920  **/
2921 void
2922 gtk_drag_source_set_icon_stock (GtkWidget   *widget,
2923                                 const gchar *stock_id)
2924 {
2925   GtkDragSourceSite *site;
2926
2927   g_return_if_fail (GTK_IS_WIDGET (widget));
2928   g_return_if_fail (stock_id != NULL);
2929
2930   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
2931   g_return_if_fail (site != NULL);
2932
2933   gtk_drag_source_unset_icon (site);
2934
2935   site->icon_type = GTK_IMAGE_STOCK;
2936   site->icon_data.stock.stock_id = g_strdup (stock_id);
2937 }
2938
2939 /**
2940  * gtk_drag_source_set_icon_name:
2941  * @widget: a #GtkWidget
2942  * @icon_name: name of icon to use
2943  *
2944  * Sets the icon that will be used for drags from a particular source
2945  * to a themed icon. See the docs for #GtkIconTheme for more details.
2946  *
2947  * Since: 2.8
2948  **/
2949 void
2950 gtk_drag_source_set_icon_name (GtkWidget   *widget,
2951                                const gchar *icon_name)
2952 {
2953   GtkDragSourceSite *site;
2954
2955   g_return_if_fail (GTK_IS_WIDGET (widget));
2956   g_return_if_fail (icon_name != NULL);
2957
2958   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
2959   g_return_if_fail (site != NULL);
2960
2961   gtk_drag_source_unset_icon (site);
2962
2963   site->icon_type = GTK_IMAGE_ICON_NAME;
2964   site->icon_data.name.icon_name = g_strdup (icon_name);
2965 }
2966
2967 static void
2968 gtk_drag_get_icon (GtkDragSourceInfo *info,
2969                    GtkWidget        **icon_window,
2970                    gint              *hot_x,
2971                    gint              *hot_y)
2972 {
2973   if (get_can_change_screen (info->icon_window))
2974     gtk_window_set_screen (GTK_WINDOW (info->icon_window),
2975                            info->cur_screen);
2976
2977   if (gtk_widget_get_screen (info->icon_window) != info->cur_screen)
2978     {
2979       if (!info->fallback_icon)
2980         {
2981           gint save_hot_x, save_hot_y;
2982           gboolean save_destroy_icon;
2983           GtkWidget *save_icon_window;
2984
2985           /* HACK to get the appropriate icon
2986            */
2987           save_icon_window = info->icon_window;
2988           save_hot_x = info->hot_x;
2989           save_hot_y = info->hot_x;
2990           save_destroy_icon = info->destroy_icon;
2991
2992           info->icon_window = NULL;
2993           if (!default_icon_pixmap)
2994             set_icon_stock_pixbuf (info->context,
2995                                    GTK_STOCK_DND, NULL, -2, -2, TRUE);
2996           else
2997             gtk_drag_set_icon_pixmap (info->context,
2998                                       default_icon_colormap,
2999                                       default_icon_pixmap,
3000                                       default_icon_mask,
3001                                       default_icon_hot_x,
3002                                       default_icon_hot_y);
3003           info->fallback_icon = info->icon_window;
3004
3005           info->icon_window = save_icon_window;
3006           info->hot_x = save_hot_x;
3007           info->hot_y = save_hot_y;
3008           info->destroy_icon = save_destroy_icon;
3009         }
3010
3011       gtk_widget_hide (info->icon_window);
3012
3013       *icon_window = info->fallback_icon;
3014       gtk_window_set_screen (GTK_WINDOW (*icon_window), info->cur_screen);
3015
3016       if (!default_icon_pixmap)
3017         {
3018           *hot_x = -2;
3019           *hot_y = -2;
3020         }
3021       else
3022         {
3023           *hot_x = default_icon_hot_x;
3024           *hot_y = default_icon_hot_y;
3025         }
3026     }
3027   else
3028     {
3029       if (info->fallback_icon)
3030         gtk_widget_hide (info->fallback_icon);
3031
3032       *icon_window = info->icon_window;
3033       *hot_x = info->hot_x;
3034       *hot_y = info->hot_y;
3035     }
3036 }
3037
3038 static void
3039 gtk_drag_update_icon (GtkDragSourceInfo *info)
3040 {
3041   if (info->icon_window)
3042     {
3043       GtkWidget *icon_window;
3044       gint hot_x, hot_y;
3045
3046       gtk_drag_get_icon (info, &icon_window, &hot_x, &hot_y);
3047
3048       gtk_window_move (GTK_WINDOW (icon_window),
3049                        info->cur_x - hot_x,
3050                        info->cur_y - hot_y);
3051
3052       if (gtk_widget_get_visible (icon_window))
3053         gdk_window_raise (icon_window->window);
3054       else
3055         gtk_widget_show (icon_window);
3056     }
3057 }
3058
3059 static void
3060 gtk_drag_set_icon_window (GdkDragContext *context,
3061                           GtkWidget      *widget,
3062                           gint            hot_x,
3063                           gint            hot_y,
3064                           gboolean        destroy_on_release)
3065 {
3066   GtkDragSourceInfo *info;
3067
3068   info = gtk_drag_get_source_info (context, FALSE);
3069   if (info == NULL)
3070     {
3071       if (destroy_on_release)
3072         gtk_widget_destroy (widget);
3073       return;
3074     }
3075
3076   gtk_drag_remove_icon (info);
3077
3078   if (widget)
3079     g_object_ref (widget);
3080
3081   info->icon_window = widget;
3082   info->hot_x = hot_x;
3083   info->hot_y = hot_y;
3084   info->destroy_icon = destroy_on_release;
3085
3086   if (widget && info->icon_pixbuf)
3087     {
3088       g_object_unref (info->icon_pixbuf);
3089       info->icon_pixbuf = NULL;
3090     }
3091
3092   gtk_drag_update_cursor (info);
3093   gtk_drag_update_icon (info);
3094 }
3095
3096 /**
3097  * gtk_drag_set_icon_widget:
3098  * @context: the context for a drag. (This must be called
3099           with a  context for the source side of a drag)
3100  * @widget: a toplevel window to use as an icon.
3101  * @hot_x: the X offset within @widget of the hotspot.
3102  * @hot_y: the Y offset within @widget of the hotspot.
3103  *
3104  * Changes the icon for a widget to a given widget. GTK+
3105  * will not destroy the icon, so if you don't want
3106  * it to persist, you should connect to the "drag-end"
3107  * signal and destroy it yourself.
3108  **/
3109 void
3110 gtk_drag_set_icon_widget (GdkDragContext    *context,
3111                           GtkWidget         *widget,
3112                           gint               hot_x,
3113                           gint               hot_y)
3114 {
3115   g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
3116   g_return_if_fail (context->is_source);
3117   g_return_if_fail (GTK_IS_WIDGET (widget));
3118
3119   gtk_drag_set_icon_window (context, widget, hot_x, hot_y, FALSE);
3120 }
3121
3122 static void
3123 icon_window_realize (GtkWidget *window,
3124                      GdkPixbuf *pixbuf)
3125 {
3126   GdkPixmap *pixmap;
3127   GdkPixmap *mask;
3128
3129   gdk_pixbuf_render_pixmap_and_mask_for_colormap (pixbuf,
3130                                                   gtk_widget_get_colormap (window),
3131                                                   &pixmap, &mask, 128);
3132
3133   gdk_window_set_back_pixmap (window->window, pixmap, FALSE);
3134   g_object_unref (pixmap);
3135
3136   if (mask)
3137     {
3138       gtk_widget_shape_combine_mask (window, mask, 0, 0);
3139       g_object_unref (mask);
3140     }
3141 }
3142
3143 static void
3144 set_icon_stock_pixbuf (GdkDragContext    *context,
3145                        const gchar       *stock_id,
3146                        GdkPixbuf         *pixbuf,
3147                        gint               hot_x,
3148                        gint               hot_y,
3149                        gboolean           force_window)
3150 {
3151   GtkWidget *window;
3152   gint width, height;
3153   GdkScreen *screen;
3154   GdkDisplay *display;
3155
3156   g_return_if_fail (context != NULL);
3157   g_return_if_fail (pixbuf != NULL || stock_id != NULL);
3158   g_return_if_fail (pixbuf == NULL || stock_id == NULL);
3159
3160   screen = gdk_drawable_get_screen (context->source_window);
3161
3162   /* Push a NULL colormap to guard against gtk_widget_push_colormap() */
3163   gtk_widget_push_colormap (NULL);
3164   window = gtk_window_new (GTK_WINDOW_POPUP);
3165   gtk_window_set_type_hint (GTK_WINDOW (window), GDK_WINDOW_TYPE_HINT_DND);
3166   gtk_window_set_screen (GTK_WINDOW (window), screen);
3167   set_can_change_screen (window, TRUE);
3168   gtk_widget_pop_colormap ();
3169
3170   gtk_widget_set_events (window, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
3171   gtk_widget_set_app_paintable (window, TRUE);
3172
3173   if (stock_id)
3174     {
3175       pixbuf = gtk_widget_render_icon (window, stock_id,
3176                                        GTK_ICON_SIZE_DND, NULL);
3177
3178       if (!pixbuf)
3179         {
3180           g_warning ("Cannot load drag icon from stock_id %s", stock_id);
3181           gtk_widget_destroy (window);
3182           return;
3183         }
3184
3185     }
3186   else
3187     g_object_ref (pixbuf);
3188
3189   display = gdk_drawable_get_display (context->source_window);
3190   width = gdk_pixbuf_get_width (pixbuf);
3191   height = gdk_pixbuf_get_height (pixbuf);
3192
3193   if (!force_window &&
3194       gtk_drag_can_use_rgba_cursor (display, width + 2, height + 2))
3195     {
3196       GtkDragSourceInfo *info;
3197
3198       gtk_widget_destroy (window);
3199
3200       info = gtk_drag_get_source_info (context, FALSE);
3201
3202       if (info->icon_pixbuf)
3203         g_object_unref (info->icon_pixbuf);
3204       info->icon_pixbuf = pixbuf;
3205
3206       gtk_drag_set_icon_window (context, NULL, hot_x, hot_y, TRUE);
3207     }
3208   else
3209     {
3210       gtk_widget_set_size_request (window, width, height);
3211
3212       g_signal_connect_closure (window, "realize",
3213                                 g_cclosure_new (G_CALLBACK (icon_window_realize),
3214                                                 pixbuf,
3215                                                 (GClosureNotify)g_object_unref),
3216                                 FALSE);
3217
3218       gtk_drag_set_icon_window (context, window, hot_x, hot_y, TRUE);
3219    }
3220 }
3221
3222 /**
3223  * gtk_drag_set_icon_pixbuf:
3224  * @context: the context for a drag. (This must be called
3225  *            with a  context for the source side of a drag)
3226  * @pixbuf: the #GdkPixbuf to use as the drag icon.
3227  * @hot_x: the X offset within @widget of the hotspot.
3228  * @hot_y: the Y offset within @widget of the hotspot.
3229  *
3230  * Sets @pixbuf as the icon for a given drag.
3231  **/
3232 void
3233 gtk_drag_set_icon_pixbuf  (GdkDragContext *context,
3234                            GdkPixbuf      *pixbuf,
3235                            gint            hot_x,
3236                            gint            hot_y)
3237 {
3238   g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
3239   g_return_if_fail (context->is_source);
3240   g_return_if_fail (GDK_IS_PIXBUF (pixbuf));
3241
3242   set_icon_stock_pixbuf (context, NULL, pixbuf, hot_x, hot_y, FALSE);
3243 }
3244
3245 /**
3246  * gtk_drag_set_icon_stock:
3247  * @context: the context for a drag. (This must be called
3248  *            with a  context for the source side of a drag)
3249  * @stock_id: the ID of the stock icon to use for the drag.
3250  * @hot_x: the X offset within the icon of the hotspot.
3251  * @hot_y: the Y offset within the icon of the hotspot.
3252  *
3253  * Sets the icon for a given drag from a stock ID.
3254  **/
3255 void
3256 gtk_drag_set_icon_stock  (GdkDragContext *context,
3257                           const gchar    *stock_id,
3258                           gint            hot_x,
3259                           gint            hot_y)
3260 {
3261   g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
3262   g_return_if_fail (context->is_source);
3263   g_return_if_fail (stock_id != NULL);
3264
3265   set_icon_stock_pixbuf (context, stock_id, NULL, hot_x, hot_y, FALSE);
3266 }
3267
3268 /**
3269  * gtk_drag_set_icon_pixmap:
3270  * @context: the context for a drag. (This must be called
3271  *            with a  context for the source side of a drag)
3272  * @colormap: the colormap of the icon
3273  * @pixmap: the image data for the icon
3274  * @mask: (allow-none): the transparency mask for the icon or %NULL for none.
3275  * @hot_x: the X offset within @pixmap of the hotspot.
3276  * @hot_y: the Y offset within @pixmap of the hotspot.
3277  *
3278  * Sets @pixmap as the icon for a given drag. GTK+ retains
3279  * references for the arguments, and will release them when
3280  * they are no longer needed. In general, gtk_drag_set_icon_pixbuf()
3281  * will be more convenient to use.
3282  **/
3283 void
3284 gtk_drag_set_icon_pixmap (GdkDragContext    *context,
3285                           GdkColormap       *colormap,
3286                           GdkPixmap         *pixmap,
3287                           GdkBitmap         *mask,
3288                           gint               hot_x,
3289                           gint               hot_y)
3290 {
3291   GtkWidget *window;
3292   GdkScreen *screen;
3293   gint width, height;
3294
3295   g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
3296   g_return_if_fail (context->is_source);
3297   g_return_if_fail (GDK_IS_COLORMAP (colormap));
3298   g_return_if_fail (GDK_IS_PIXMAP (pixmap));
3299   g_return_if_fail (!mask || GDK_IS_PIXMAP (mask));
3300
3301   screen = gdk_colormap_get_screen (colormap);
3302
3303   g_return_if_fail (gdk_drawable_get_screen (pixmap) == screen);
3304   g_return_if_fail (!mask || gdk_drawable_get_screen (mask) == screen);
3305
3306   gdk_drawable_get_size (pixmap, &width, &height);
3307
3308   gtk_widget_push_colormap (colormap);
3309
3310   window = gtk_window_new (GTK_WINDOW_POPUP);
3311   gtk_window_set_type_hint (GTK_WINDOW (window), GDK_WINDOW_TYPE_HINT_DND);
3312   gtk_window_set_screen (GTK_WINDOW (window), screen);
3313   set_can_change_screen (window, FALSE);
3314   gtk_widget_set_events (window, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
3315   gtk_widget_set_app_paintable (GTK_WIDGET (window), TRUE);
3316
3317   gtk_widget_pop_colormap ();
3318
3319   gtk_widget_set_size_request (window, width, height);
3320   gtk_widget_realize (window);
3321
3322   gdk_window_set_back_pixmap (window->window, pixmap, FALSE);
3323
3324   if (mask)
3325     gtk_widget_shape_combine_mask (window, mask, 0, 0);
3326
3327   gtk_drag_set_icon_window (context, window, hot_x, hot_y, TRUE);
3328 }
3329
3330 /**
3331  * gtk_drag_set_icon_name:
3332  * @context: the context for a drag. (This must be called
3333  *            with a context for the source side of a drag)
3334  * @icon_name: name of icon to use
3335  * @hot_x: the X offset of the hotspot within the icon
3336  * @hot_y: the Y offset of the hotspot within the icon
3337  *
3338  * Sets the icon for a given drag from a named themed icon. See
3339  * the docs for #GtkIconTheme for more details. Note that the
3340  * size of the icon depends on the icon theme (the icon is
3341  * loaded at the symbolic size #GTK_ICON_SIZE_DND), thus
3342  * @hot_x and @hot_y have to be used with care.
3343  *
3344  * Since: 2.8
3345  **/
3346 void
3347 gtk_drag_set_icon_name (GdkDragContext *context,
3348                         const gchar    *icon_name,
3349                         gint            hot_x,
3350                         gint            hot_y)
3351 {
3352   GdkScreen *screen;
3353   GtkSettings *settings;
3354   GtkIconTheme *icon_theme;
3355   GdkPixbuf *pixbuf;
3356   gint width, height, icon_size;
3357
3358   g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
3359   g_return_if_fail (context->is_source);
3360   g_return_if_fail (icon_name != NULL);
3361
3362   screen = gdk_drawable_get_screen (context->source_window);
3363   g_return_if_fail (screen != NULL);
3364
3365   settings = gtk_settings_get_for_screen (screen);
3366   if (gtk_icon_size_lookup_for_settings (settings,
3367                                          GTK_ICON_SIZE_DND,
3368                                          &width, &height))
3369     icon_size = MAX (width, height);
3370   else
3371     icon_size = 32; /* default value for GTK_ICON_SIZE_DND */
3372
3373   icon_theme = gtk_icon_theme_get_for_screen (screen);
3374
3375   pixbuf = gtk_icon_theme_load_icon (icon_theme, icon_name,
3376                                      icon_size, 0, NULL);
3377   if (pixbuf)
3378     set_icon_stock_pixbuf (context, NULL, pixbuf, hot_x, hot_y, FALSE);
3379   else
3380     g_warning ("Cannot load drag icon from icon name %s", icon_name);
3381 }
3382
3383 /**
3384  * gtk_drag_set_icon_default:
3385  * @context: the context for a drag. (This must be called
3386              with a  context for the source side of a drag)
3387  *
3388  * Sets the icon for a particular drag to the default
3389  * icon.
3390  **/
3391 void
3392 gtk_drag_set_icon_default (GdkDragContext *context)
3393 {
3394   g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
3395   g_return_if_fail (context->is_source);
3396
3397   if (!default_icon_pixmap)
3398     gtk_drag_set_icon_stock (context, GTK_STOCK_DND, -2, -2);
3399   else
3400     gtk_drag_set_icon_pixmap (context,
3401                               default_icon_colormap,
3402                               default_icon_pixmap,
3403                               default_icon_mask,
3404                               default_icon_hot_x,
3405                               default_icon_hot_y);
3406 }
3407
3408 /**
3409  * gtk_drag_set_default_icon:
3410  * @colormap: the colormap of the icon
3411  * @pixmap: the image data for the icon
3412  * @mask: the transparency mask for an image.
3413  * @hot_x: The X offset within @widget of the hotspot.
3414  * @hot_y: The Y offset within @widget of the hotspot.
3415  *
3416  * Changes the default drag icon. GTK+ retains references for the
3417  * arguments, and will release them when they are no longer needed.
3418  *
3419  * Deprecated: Change the default drag icon via the stock system by
3420  *     changing the stock pixbuf for #GTK_STOCK_DND instead.
3421  **/
3422 void
3423 gtk_drag_set_default_icon (GdkColormap   *colormap,
3424                            GdkPixmap     *pixmap,
3425                            GdkBitmap     *mask,
3426                            gint           hot_x,
3427                            gint           hot_y)
3428 {
3429   g_return_if_fail (GDK_IS_COLORMAP (colormap));
3430   g_return_if_fail (GDK_IS_PIXMAP (pixmap));
3431   g_return_if_fail (!mask || GDK_IS_PIXMAP (mask));
3432
3433   if (default_icon_colormap)
3434     g_object_unref (default_icon_colormap);
3435   if (default_icon_pixmap)
3436     g_object_unref (default_icon_pixmap);
3437   if (default_icon_mask)
3438     g_object_unref (default_icon_mask);
3439
3440   default_icon_colormap = colormap;
3441   g_object_ref (colormap);
3442
3443   default_icon_pixmap = pixmap;
3444   g_object_ref (pixmap);
3445
3446   default_icon_mask = mask;
3447   if (mask)
3448     g_object_ref (mask);
3449
3450   default_icon_hot_x = hot_x;
3451   default_icon_hot_y = hot_y;
3452 }
3453
3454
3455 /*************************************************************
3456  * _gtk_drag_source_handle_event:
3457  *     Called from widget event handling code on Drag events
3458  *     for drag sources.
3459  *
3460  *   arguments:
3461  *     toplevel: Toplevel widget that received the event
3462  *     event:
3463  *   results:
3464  *************************************************************/
3465
3466 void
3467 _gtk_drag_source_handle_event (GtkWidget *widget,
3468                                GdkEvent  *event)
3469 {
3470   GtkDragSourceInfo *info;
3471   GdkDragContext *context;
3472
3473   g_return_if_fail (widget != NULL);
3474   g_return_if_fail (event != NULL);
3475
3476   context = event->dnd.context;
3477   info = gtk_drag_get_source_info (context, FALSE);
3478   if (!info)
3479     return;
3480
3481   switch (event->type)
3482     {
3483     case GDK_DRAG_STATUS:
3484       {
3485         GdkCursor *cursor;
3486
3487         if (info->proxy_dest)
3488           {
3489             if (!event->dnd.send_event)
3490               {
3491                 if (info->proxy_dest->proxy_drop_wait)
3492                   {
3493                     gboolean result = context->action != 0;
3494
3495                     /* Aha - we can finally pass the MOTIF DROP on... */
3496                     gdk_drop_reply (info->proxy_dest->context, result, info->proxy_dest->proxy_drop_time);
3497                     if (result)
3498                       gdk_drag_drop (info->context, info->proxy_dest->proxy_drop_time);
3499                     else
3500                       gtk_drag_finish (info->proxy_dest->context, FALSE, FALSE, info->proxy_dest->proxy_drop_time);
3501                   }
3502                 else
3503                   {
3504                     gdk_drag_status (info->proxy_dest->context,
3505                                      event->dnd.context->action,
3506                                      event->dnd.time);
3507                   }
3508               }
3509           }
3510         else if (info->have_grab)
3511           {
3512             cursor = gtk_drag_get_cursor (gtk_widget_get_display (widget),
3513                                           event->dnd.context->action,
3514                                           info);
3515             if (info->cursor != cursor)
3516               {
3517                 gdk_pointer_grab (widget->window, FALSE,
3518                                   GDK_POINTER_MOTION_MASK |
3519                                   GDK_BUTTON_RELEASE_MASK,
3520                                   NULL,
3521                                   cursor, info->grab_time);
3522                 info->cursor = cursor;
3523               }
3524
3525             gtk_drag_add_update_idle (info);
3526           }
3527       }
3528       break;
3529
3530     case GDK_DROP_FINISHED:
3531       gtk_drag_drop_finished (info, GTK_DRAG_RESULT_SUCCESS, event->dnd.time);
3532       break;
3533     default:
3534       g_assert_not_reached ();
3535     }
3536 }
3537
3538 /*************************************************************
3539  * gtk_drag_source_check_selection:
3540  *     Check if we've set up handlers/claimed the selection
3541  *     for a given drag. If not, add them.
3542  *   arguments:
3543  *
3544  *   results:
3545  *************************************************************/
3546
3547 static void
3548 gtk_drag_source_check_selection (GtkDragSourceInfo *info,
3549                                  GdkAtom            selection,
3550                                  guint32            time)
3551 {
3552   GList *tmp_list;
3553
3554   tmp_list = info->selections;
3555   while (tmp_list)
3556     {
3557       if (GDK_POINTER_TO_ATOM (tmp_list->data) == selection)
3558         return;
3559       tmp_list = tmp_list->next;
3560     }
3561
3562   gtk_selection_owner_set_for_display (gtk_widget_get_display (info->widget),
3563                                        info->ipc_widget,
3564                                        selection,
3565                                        time);
3566   info->selections = g_list_prepend (info->selections,
3567                                      GUINT_TO_POINTER (selection));
3568
3569   tmp_list = info->target_list->list;
3570   while (tmp_list)
3571     {
3572       GtkTargetPair *pair = tmp_list->data;
3573
3574       gtk_selection_add_target (info->ipc_widget,
3575                                 selection,
3576                                 pair->target,
3577                                 pair->info);
3578       tmp_list = tmp_list->next;
3579     }
3580
3581   if (info->context->protocol == GDK_DRAG_PROTO_MOTIF)
3582     {
3583       gtk_selection_add_target (info->ipc_widget,
3584                                 selection,
3585                                 gdk_atom_intern_static_string ("XmTRANSFER_SUCCESS"),
3586                                 TARGET_MOTIF_SUCCESS);
3587       gtk_selection_add_target (info->ipc_widget,
3588                                 selection,
3589                                 gdk_atom_intern_static_string ("XmTRANSFER_FAILURE"),
3590                                 TARGET_MOTIF_FAILURE);
3591     }
3592
3593   gtk_selection_add_target (info->ipc_widget,
3594                             selection,
3595                             gdk_atom_intern_static_string ("DELETE"),
3596                             TARGET_DELETE);
3597 }
3598
3599 /*************************************************************
3600  * gtk_drag_drop_finished:
3601  *     Clean up from the drag, and display snapback, if necessary.
3602  *   arguments:
3603  *     info:
3604  *     success:
3605  *     time:
3606  *   results:
3607  *************************************************************/
3608
3609 static void
3610 gtk_drag_drop_finished (GtkDragSourceInfo *info,
3611                         GtkDragResult      result,
3612                         guint              time)
3613 {
3614   gboolean success;
3615
3616   success = (result == GTK_DRAG_RESULT_SUCCESS);
3617   gtk_drag_source_release_selections (info, time);
3618
3619   if (info->proxy_dest)
3620     {
3621       /* The time from the event isn't reliable for Xdnd drags */
3622       gtk_drag_finish (info->proxy_dest->context, success, FALSE,
3623                        info->proxy_dest->proxy_drop_time);
3624       gtk_drag_source_info_destroy (info);
3625     }
3626   else
3627     {
3628       if (!success)
3629         g_signal_emit_by_name (info->widget, "drag-failed",
3630                                info->context, result, &success);
3631
3632       if (success)
3633         {
3634           gtk_drag_source_info_destroy (info);
3635         }
3636       else
3637         {
3638           GtkDragAnim *anim = g_new (GtkDragAnim, 1);
3639           anim->info = info;
3640           anim->step = 0;
3641
3642           anim->n_steps = MAX (info->cur_x - info->start_x,
3643                                info->cur_y - info->start_y) / ANIM_STEP_LENGTH;
3644           anim->n_steps = CLAMP (anim->n_steps, ANIM_MIN_STEPS, ANIM_MAX_STEPS);
3645
3646           info->cur_screen = gtk_widget_get_screen (info->widget);
3647
3648           if (!info->icon_window)
3649             set_icon_stock_pixbuf (info->context, NULL, info->icon_pixbuf,
3650                                    0, 0, TRUE);
3651
3652           gtk_drag_update_icon (info);
3653
3654           /* Mark the context as dead, so if the destination decides
3655            * to respond really late, we still are OK.
3656            */
3657           gtk_drag_clear_source_info (info->context);
3658           gdk_threads_add_timeout (ANIM_STEP_TIME, gtk_drag_anim_timeout, anim);
3659         }
3660     }
3661 }
3662
3663 static void
3664 gtk_drag_source_release_selections (GtkDragSourceInfo *info,
3665                                     guint32            time)
3666 {
3667   GdkDisplay *display = gtk_widget_get_display (info->widget);
3668   GList *tmp_list = info->selections;
3669
3670   while (tmp_list)
3671     {
3672       GdkAtom selection = GDK_POINTER_TO_ATOM (tmp_list->data);
3673       if (gdk_selection_owner_get_for_display (display, selection) == info->ipc_widget->window)
3674         gtk_selection_owner_set_for_display (display, NULL, selection, time);
3675
3676       tmp_list = tmp_list->next;
3677     }
3678
3679   g_list_free (info->selections);
3680   info->selections = NULL;
3681 }
3682
3683 /*************************************************************
3684  * gtk_drag_drop:
3685  *     Send a drop event.
3686  *   arguments:
3687  *
3688  *   results:
3689  *************************************************************/
3690
3691 static void
3692 gtk_drag_drop (GtkDragSourceInfo *info,
3693                guint32            time)
3694 {
3695   if (info->context->protocol == GDK_DRAG_PROTO_ROOTWIN)
3696     {
3697       GtkSelectionData selection_data;
3698       GList *tmp_list;
3699       /* GTK+ traditionally has used application/x-rootwin-drop, but the
3700        * XDND spec specifies x-rootwindow-drop.
3701        */
3702       GdkAtom target1 = gdk_atom_intern_static_string ("application/x-rootwindow-drop");
3703       GdkAtom target2 = gdk_atom_intern_static_string ("application/x-rootwin-drop");
3704
3705       tmp_list = info->target_list->list;
3706       while (tmp_list)
3707         {
3708           GtkTargetPair *pair = tmp_list->data;
3709
3710           if (pair->target == target1 || pair->target == target2)
3711             {
3712               selection_data.selection = GDK_NONE;
3713               selection_data.target = pair->target;
3714               selection_data.data = NULL;
3715               selection_data.length = -1;
3716
3717               g_signal_emit_by_name (info->widget, "drag-data-get",
3718                                      info->context, &selection_data,
3719                                      pair->info,
3720                                      time);
3721
3722               /* FIXME: Should we check for length >= 0 here? */
3723               gtk_drag_drop_finished (info, GTK_DRAG_RESULT_SUCCESS, time);
3724               return;
3725             }
3726           tmp_list = tmp_list->next;
3727         }
3728       gtk_drag_drop_finished (info, GTK_DRAG_RESULT_NO_TARGET, time);
3729     }
3730   else
3731     {
3732       if (info->icon_window)
3733         gtk_widget_hide (info->icon_window);
3734
3735       gdk_drag_drop (info->context, time);
3736       info->drop_timeout = gdk_threads_add_timeout (DROP_ABORT_TIME,
3737                                           gtk_drag_abort_timeout,
3738                                           info);
3739     }
3740 }
3741
3742 /*
3743  * Source side callbacks.
3744  */
3745
3746 static gboolean
3747 gtk_drag_source_event_cb (GtkWidget      *widget,
3748                           GdkEvent       *event,
3749                           gpointer        data)
3750 {
3751   GtkDragSourceSite *site;
3752   gboolean retval = FALSE;
3753   site = (GtkDragSourceSite *)data;
3754
3755   switch (event->type)
3756     {
3757     case GDK_BUTTON_PRESS:
3758       if ((GDK_BUTTON1_MASK << (event->button.button - 1)) & site->start_button_mask)
3759         {
3760           site->state |= (GDK_BUTTON1_MASK << (event->button.button - 1));
3761           site->x = event->button.x;
3762           site->y = event->button.y;
3763         }
3764       break;
3765
3766     case GDK_BUTTON_RELEASE:
3767       if ((GDK_BUTTON1_MASK << (event->button.button - 1)) & site->start_button_mask)
3768         site->state &= ~(GDK_BUTTON1_MASK << (event->button.button - 1));
3769       break;
3770
3771     case GDK_MOTION_NOTIFY:
3772       if (site->state & event->motion.state & site->start_button_mask)
3773         {
3774           /* FIXME: This is really broken and can leave us
3775            * with a stuck grab
3776            */
3777           int i;
3778           for (i=1; i<6; i++)
3779             {
3780               if (site->state & event->motion.state &
3781                   GDK_BUTTON1_MASK << (i - 1))
3782                 break;
3783             }
3784
3785           if (gtk_drag_check_threshold (widget, site->x, site->y,
3786                                         event->motion.x, event->motion.y))
3787             {
3788               site->state = 0;
3789               gtk_drag_begin_internal (widget, site, site->target_list,
3790                                        site->actions,
3791                                        i, event);
3792
3793               retval = TRUE;
3794             }
3795         }
3796       break;
3797
3798     default:                    /* hit for 2/3BUTTON_PRESS */
3799       break;
3800     }
3801
3802   return retval;
3803 }
3804
3805 static void
3806 gtk_drag_source_site_destroy (gpointer data)
3807 {
3808   GtkDragSourceSite *site = data;
3809
3810   if (site->target_list)
3811     gtk_target_list_unref (site->target_list);
3812
3813   gtk_drag_source_unset_icon (site);
3814   g_free (site);
3815 }
3816
3817 static void
3818 gtk_drag_selection_get (GtkWidget        *widget,
3819                         GtkSelectionData *selection_data,
3820                         guint             sel_info,
3821                         guint32           time,
3822                         gpointer          data)
3823 {
3824   GtkDragSourceInfo *info = data;
3825   static GdkAtom null_atom = GDK_NONE;
3826   guint target_info;
3827
3828   if (!null_atom)
3829     null_atom = gdk_atom_intern_static_string ("NULL");
3830
3831   switch (sel_info)
3832     {
3833     case TARGET_DELETE:
3834       g_signal_emit_by_name (info->widget,
3835                              "drag-data-delete",
3836                              info->context);
3837       gtk_selection_data_set (selection_data, null_atom, 8, NULL, 0);
3838       break;
3839     case TARGET_MOTIF_SUCCESS:
3840       gtk_drag_drop_finished (info, GTK_DRAG_RESULT_SUCCESS, time);
3841       gtk_selection_data_set (selection_data, null_atom, 8, NULL, 0);
3842       break;
3843     case TARGET_MOTIF_FAILURE:
3844       gtk_drag_drop_finished (info, GTK_DRAG_RESULT_NO_TARGET, time);
3845       gtk_selection_data_set (selection_data, null_atom, 8, NULL, 0);
3846       break;
3847     default:
3848       if (info->proxy_dest)
3849         {
3850           /* This is sort of dangerous and needs to be thought
3851            * through better
3852            */
3853           info->proxy_dest->proxy_data = selection_data;
3854           gtk_drag_get_data (info->widget,
3855                              info->proxy_dest->context,
3856                              selection_data->target,
3857                              time);
3858           gtk_main ();
3859           info->proxy_dest->proxy_data = NULL;
3860         }
3861       else
3862         {
3863           if (gtk_target_list_find (info->target_list,
3864                                     selection_data->target,
3865                                     &target_info))
3866             {
3867               g_signal_emit_by_name (info->widget, "drag-data-get",
3868                                      info->context,
3869                                      selection_data,
3870                                      target_info,
3871                                      time);
3872             }
3873         }
3874       break;
3875     }
3876 }
3877
3878 static gboolean
3879 gtk_drag_anim_timeout (gpointer data)
3880 {
3881   GtkDragAnim *anim = data;
3882   gint x, y;
3883   gboolean retval;
3884
3885   if (anim->step == anim->n_steps)
3886     {
3887       gtk_drag_source_info_destroy (anim->info);
3888       g_free (anim);
3889
3890       retval = FALSE;
3891     }
3892   else
3893     {
3894       x = (anim->info->start_x * (anim->step + 1) +
3895            anim->info->cur_x * (anim->n_steps - anim->step - 1)) / anim->n_steps;
3896       y = (anim->info->start_y * (anim->step + 1) +
3897            anim->info->cur_y * (anim->n_steps - anim->step - 1)) / anim->n_steps;
3898       if (anim->info->icon_window)
3899         {
3900           GtkWidget *icon_window;
3901           gint hot_x, hot_y;
3902
3903           gtk_drag_get_icon (anim->info, &icon_window, &hot_x, &hot_y);
3904           gtk_window_move (GTK_WINDOW (icon_window),
3905                            x - hot_x,
3906                            y - hot_y);
3907         }
3908
3909       anim->step++;
3910
3911       retval = TRUE;
3912     }
3913
3914   return retval;
3915 }
3916
3917 static void
3918 gtk_drag_remove_icon (GtkDragSourceInfo *info)
3919 {
3920   if (info->icon_window)
3921     {
3922       gtk_widget_hide (info->icon_window);
3923       if (info->destroy_icon)
3924         gtk_widget_destroy (info->icon_window);
3925
3926       if (info->fallback_icon)
3927         {
3928           gtk_widget_destroy (info->fallback_icon);
3929           info->fallback_icon = NULL;
3930         }
3931
3932       g_object_unref (info->icon_window);
3933       info->icon_window = NULL;
3934     }
3935 }
3936
3937 static void
3938 gtk_drag_source_info_destroy (GtkDragSourceInfo *info)
3939 {
3940   gint i;
3941
3942   for (i = 0; i < n_drag_cursors; i++)
3943     {
3944       if (info->drag_cursors[i] != NULL)
3945         {
3946           gdk_cursor_unref (info->drag_cursors[i]);
3947           info->drag_cursors[i] = NULL;
3948         }
3949     }
3950
3951   gtk_drag_remove_icon (info);
3952
3953   if (info->icon_pixbuf)
3954     {
3955       g_object_unref (info->icon_pixbuf);
3956       info->icon_pixbuf = NULL;
3957     }
3958
3959   g_signal_handlers_disconnect_by_func (info->ipc_widget,
3960                                         gtk_drag_grab_broken_event_cb,
3961                                         info);
3962   g_signal_handlers_disconnect_by_func (info->ipc_widget,
3963                                         gtk_drag_grab_notify_cb,
3964                                         info);
3965   g_signal_handlers_disconnect_by_func (info->ipc_widget,
3966                                         gtk_drag_button_release_cb,
3967                                         info);
3968   g_signal_handlers_disconnect_by_func (info->ipc_widget,
3969                                         gtk_drag_motion_cb,
3970                                         info);
3971   g_signal_handlers_disconnect_by_func (info->ipc_widget,
3972                                         gtk_drag_key_cb,
3973                                         info);
3974   g_signal_handlers_disconnect_by_func (info->ipc_widget,
3975                                         gtk_drag_selection_get,
3976                                         info);
3977
3978   if (!info->proxy_dest)
3979     g_signal_emit_by_name (info->widget, "drag-end", info->context);
3980
3981   if (info->widget)
3982     g_object_unref (info->widget);
3983
3984   gtk_selection_remove_all (info->ipc_widget);
3985   g_object_set_data (G_OBJECT (info->ipc_widget), I_("gtk-info"), NULL);
3986   source_widgets = g_slist_remove (source_widgets, info->ipc_widget);
3987   gtk_drag_release_ipc_widget (info->ipc_widget);
3988
3989   gtk_target_list_unref (info->target_list);
3990
3991   gtk_drag_clear_source_info (info->context);
3992   g_object_unref (info->context);
3993
3994   if (info->drop_timeout)
3995     g_source_remove (info->drop_timeout);
3996
3997   if (info->update_idle)
3998     g_source_remove (info->update_idle);
3999
4000   g_free (info);
4001 }
4002
4003 static gboolean
4004 gtk_drag_update_idle (gpointer data)
4005 {
4006   GtkDragSourceInfo *info = data;
4007   GdkWindow *dest_window;
4008   GdkDragProtocol protocol;
4009   GdkAtom selection;
4010
4011   GdkDragAction action;
4012   GdkDragAction possible_actions;
4013   guint32 time;
4014
4015   info->update_idle = 0;
4016
4017   if (info->last_event)
4018     {
4019       time = gtk_drag_get_event_time (info->last_event);
4020       gtk_drag_get_event_actions (info->last_event,
4021                                   info->button,
4022                                   info->possible_actions,
4023                                   &action, &possible_actions);
4024       gtk_drag_update_icon (info);
4025       gdk_drag_find_window_for_screen (info->context,
4026                                        info->icon_window ? info->icon_window->window : NULL,
4027                                        info->cur_screen, info->cur_x, info->cur_y,
4028                                        &dest_window, &protocol);
4029
4030       if (!gdk_drag_motion (info->context, dest_window, protocol,
4031                             info->cur_x, info->cur_y, action,
4032                             possible_actions,
4033                             time))
4034         {
4035           gdk_event_free ((GdkEvent *)info->last_event);
4036           info->last_event = NULL;
4037         }
4038
4039       if (dest_window)
4040         g_object_unref (dest_window);
4041
4042       selection = gdk_drag_get_selection (info->context);
4043       if (selection)
4044         gtk_drag_source_check_selection (info, selection, time);
4045
4046     }
4047
4048   return FALSE;
4049 }
4050
4051 static void
4052 gtk_drag_add_update_idle (GtkDragSourceInfo *info)
4053 {
4054   /* We use an idle lower than GDK_PRIORITY_REDRAW so that exposes
4055    * from the last move can catch up before we move again.
4056    */
4057   if (!info->update_idle)
4058     info->update_idle = gdk_threads_add_idle_full (GDK_PRIORITY_REDRAW + 5,
4059                                          gtk_drag_update_idle,
4060                                          info,
4061                                          NULL);
4062 }
4063
4064 /**
4065  * gtk_drag_update:
4066  * @info: DragSourceInfo for the drag
4067  * @screen: new screen
4068  * @x_root: new X position
4069  * @y_root: new y position
4070  * @event: event received requiring update
4071  *
4072  * Updates the status of the drag; called when the
4073  * cursor moves or the modifier changes
4074  **/
4075 static void
4076 gtk_drag_update (GtkDragSourceInfo *info,
4077                  GdkScreen         *screen,
4078                  gint               x_root,
4079                  gint               y_root,
4080                  GdkEvent          *event)
4081 {
4082   info->cur_screen = screen;
4083   info->cur_x = x_root;
4084   info->cur_y = y_root;
4085   if (info->last_event)
4086     {
4087       gdk_event_free ((GdkEvent *)info->last_event);
4088       info->last_event = NULL;
4089     }
4090   if (event)
4091     info->last_event = gdk_event_copy ((GdkEvent *)event);
4092
4093   gtk_drag_add_update_idle (info);
4094 }
4095
4096 /*************************************************************
4097  * gtk_drag_end:
4098  *     Called when the user finishes to drag, either by
4099  *     releasing the mouse, or by pressing Esc.
4100  *   arguments:
4101  *     info: Source info for the drag
4102  *     time: Timestamp for ending the drag
4103  *   results:
4104  *************************************************************/
4105
4106 static void
4107 gtk_drag_end (GtkDragSourceInfo *info, guint32 time)
4108 {
4109   GdkEvent *send_event;
4110   GtkWidget *source_widget = info->widget;
4111   GdkDisplay *display = gtk_widget_get_display (source_widget);
4112
4113   if (info->update_idle)
4114     {
4115       g_source_remove (info->update_idle);
4116       info->update_idle = 0;
4117     }
4118
4119   if (info->last_event)
4120     {
4121       gdk_event_free (info->last_event);
4122       info->last_event = NULL;
4123     }
4124
4125   info->have_grab = FALSE;
4126
4127   g_signal_handlers_disconnect_by_func (info->ipc_widget,
4128                                         gtk_drag_grab_broken_event_cb,
4129                                         info);
4130   g_signal_handlers_disconnect_by_func (info->ipc_widget,
4131                                         gtk_drag_grab_notify_cb,
4132                                         info);
4133   g_signal_handlers_disconnect_by_func (info->ipc_widget,
4134                                         gtk_drag_button_release_cb,
4135                                         info);
4136   g_signal_handlers_disconnect_by_func (info->ipc_widget,
4137                                         gtk_drag_motion_cb,
4138                                         info);
4139   g_signal_handlers_disconnect_by_func (info->ipc_widget,
4140                                         gtk_drag_key_cb,
4141                                         info);
4142
4143   gdk_display_pointer_ungrab (display, time);
4144   ungrab_dnd_keys (info->ipc_widget, time);
4145   gtk_grab_remove (info->ipc_widget);
4146
4147   /* Send on a release pair to the original
4148    * widget to convince it to release its grab. We need to
4149    * call gtk_propagate_event() here, instead of
4150    * gtk_widget_event() because widget like GtkList may
4151    * expect propagation.
4152    */
4153
4154   send_event = gdk_event_new (GDK_BUTTON_RELEASE);
4155   send_event->button.window = g_object_ref (gtk_widget_get_root_window (source_widget));
4156   send_event->button.send_event = TRUE;
4157   send_event->button.time = time;
4158   send_event->button.x = 0;
4159   send_event->button.y = 0;
4160   send_event->button.axes = NULL;
4161   send_event->button.state = 0;
4162   send_event->button.button = info->button;
4163   send_event->button.device = gdk_display_get_core_pointer (display);
4164   send_event->button.x_root = 0;
4165   send_event->button.y_root = 0;
4166
4167   gtk_propagate_event (source_widget, send_event);
4168   gdk_event_free (send_event);
4169 }
4170
4171 /*************************************************************
4172  * gtk_drag_cancel:
4173  *    Called on cancellation of a drag, either by the user
4174  *    or programmatically.
4175  *   arguments:
4176  *     info: Source info for the drag
4177  *     time: Timestamp for ending the drag
4178  *   results:
4179  *************************************************************/
4180
4181 static void
4182 gtk_drag_cancel (GtkDragSourceInfo *info, GtkDragResult result, guint32 time)
4183 {
4184   gtk_drag_end (info, time);
4185   gdk_drag_abort (info->context, time);
4186   gtk_drag_drop_finished (info, result, time);
4187 }
4188
4189 /*************************************************************
4190  * gtk_drag_motion_cb:
4191  *     "motion-notify-event" callback during drag.
4192  *   arguments:
4193  *
4194  *   results:
4195  *************************************************************/
4196
4197 static gboolean
4198 gtk_drag_motion_cb (GtkWidget      *widget,
4199                     GdkEventMotion *event,
4200                     gpointer        data)
4201 {
4202   GtkDragSourceInfo *info = (GtkDragSourceInfo *)data;
4203   GdkScreen *screen;
4204   gint x_root, y_root;
4205
4206   if (event->is_hint)
4207     {
4208       GdkDisplay *display = gtk_widget_get_display (widget);
4209
4210       gdk_display_get_pointer (display, &screen, &x_root, &y_root, NULL);
4211       event->x_root = x_root;
4212       event->y_root = y_root;
4213     }
4214   else
4215     screen = gdk_event_get_screen ((GdkEvent *)event);
4216
4217   gtk_drag_update (info, screen, event->x_root, event->y_root, (GdkEvent *)event);
4218
4219   return TRUE;
4220 }
4221
4222 /*************************************************************
4223  * gtk_drag_key_cb:
4224  *     "key-press/release-event" callback during drag.
4225  *   arguments:
4226  *
4227  *   results:
4228  *************************************************************/
4229
4230 #define BIG_STEP 20
4231 #define SMALL_STEP 1
4232
4233 static gboolean
4234 gtk_drag_key_cb (GtkWidget         *widget,
4235                  GdkEventKey       *event,
4236                  gpointer           data)
4237 {
4238   GtkDragSourceInfo *info = (GtkDragSourceInfo *)data;
4239   GdkModifierType state;
4240   GdkWindow *root_window;
4241   gint dx, dy;
4242
4243   dx = dy = 0;
4244   state = event->state & gtk_accelerator_get_default_mod_mask ();
4245
4246   if (event->type == GDK_KEY_PRESS)
4247     {
4248       switch (event->keyval)
4249         {
4250         case GDK_Escape:
4251           gtk_drag_cancel (info, GTK_DRAG_RESULT_USER_CANCELLED, event->time);
4252           return TRUE;
4253
4254         case GDK_space:
4255         case GDK_Return:
4256         case GDK_ISO_Enter:
4257         case GDK_KP_Enter:
4258         case GDK_KP_Space:
4259           gtk_drag_end (info, event->time);
4260           gtk_drag_drop (info, event->time);
4261           return TRUE;
4262
4263         case GDK_Up:
4264         case GDK_KP_Up:
4265           dy = (state & GDK_MOD1_MASK) ? -BIG_STEP : -SMALL_STEP;
4266           break;
4267
4268         case GDK_Down:
4269         case GDK_KP_Down:
4270           dy = (state & GDK_MOD1_MASK) ? BIG_STEP : SMALL_STEP;
4271           break;
4272
4273         case GDK_Left:
4274         case GDK_KP_Left:
4275           dx = (state & GDK_MOD1_MASK) ? -BIG_STEP : -SMALL_STEP;
4276           break;
4277
4278         case GDK_Right:
4279         case GDK_KP_Right:
4280           dx = (state & GDK_MOD1_MASK) ? BIG_STEP : SMALL_STEP;
4281           break;
4282         }
4283
4284     }
4285
4286   /* Now send a "motion" so that the modifier state is updated */
4287
4288   /* The state is not yet updated in the event, so we need
4289    * to query it here. We could use XGetModifierMapping, but
4290    * that would be overkill.
4291    */
4292   root_window = gtk_widget_get_root_window (widget);
4293   gdk_window_get_pointer (root_window, NULL, NULL, &state);
4294   event->state = state;
4295
4296   if (dx != 0 || dy != 0)
4297     {
4298       info->cur_x += dx;
4299       info->cur_y += dy;
4300       gdk_display_warp_pointer (gtk_widget_get_display (widget),
4301                                 gtk_widget_get_screen (widget),
4302                                 info->cur_x, info->cur_y);
4303     }
4304
4305   gtk_drag_update (info, info->cur_screen, info->cur_x, info->cur_y, (GdkEvent *)event);
4306
4307   return TRUE;
4308 }
4309
4310 static gboolean
4311 gtk_drag_grab_broken_event_cb (GtkWidget          *widget,
4312                                GdkEventGrabBroken *event,
4313                                gpointer            data)
4314 {
4315   GtkDragSourceInfo *info = (GtkDragSourceInfo *)data;
4316
4317   /* Don't cancel if we break the implicit grab from the initial button_press.
4318    * Also, don't cancel if we re-grab on the widget or on our IPC window, for
4319    * example, when changing the drag cursor.
4320    */
4321   if (event->implicit
4322       || event->grab_window == info->widget->window
4323       || event->grab_window == info->ipc_widget->window)
4324     return FALSE;
4325
4326   gtk_drag_cancel (info, GTK_DRAG_RESULT_GRAB_BROKEN, gtk_get_current_event_time ());
4327   return TRUE;
4328 }
4329
4330 static void
4331 gtk_drag_grab_notify_cb (GtkWidget        *widget,
4332                          gboolean          was_grabbed,
4333                          gpointer          data)
4334 {
4335   GtkDragSourceInfo *info = (GtkDragSourceInfo *)data;
4336
4337   if (!was_grabbed)
4338     {
4339       /* We have to block callbacks to avoid recursion here, because
4340          gtk_drag_cancel calls gtk_grab_remove (via gtk_drag_end) */
4341       g_signal_handlers_block_by_func (widget, gtk_drag_grab_notify_cb, data);
4342       gtk_drag_cancel (info, GTK_DRAG_RESULT_GRAB_BROKEN, gtk_get_current_event_time ());
4343       g_signal_handlers_unblock_by_func (widget, gtk_drag_grab_notify_cb, data);
4344     }
4345 }
4346
4347
4348 /*************************************************************
4349  * gtk_drag_button_release_cb:
4350  *     "button-release-event" callback during drag.
4351  *   arguments:
4352  *
4353  *   results:
4354  *************************************************************/
4355
4356 static gboolean
4357 gtk_drag_button_release_cb (GtkWidget      *widget,
4358                             GdkEventButton *event,
4359                             gpointer        data)
4360 {
4361   GtkDragSourceInfo *info = (GtkDragSourceInfo *)data;
4362
4363   if (event->button != info->button)
4364     return FALSE;
4365
4366   if ((info->context->action != 0) && (info->context->dest_window != NULL))
4367     {
4368       gtk_drag_end (info, event->time);
4369       gtk_drag_drop (info, event->time);
4370     }
4371   else
4372     {
4373       gtk_drag_cancel (info, GTK_DRAG_RESULT_NO_TARGET, event->time);
4374     }
4375
4376   return TRUE;
4377 }
4378
4379 static gboolean
4380 gtk_drag_abort_timeout (gpointer data)
4381 {
4382   GtkDragSourceInfo *info = data;
4383   guint32 time = GDK_CURRENT_TIME;
4384
4385   if (info->proxy_dest)
4386     time = info->proxy_dest->proxy_drop_time;
4387
4388   info->drop_timeout = 0;
4389   gtk_drag_drop_finished (info, GTK_DRAG_RESULT_TIMEOUT_EXPIRED, time);
4390
4391   return FALSE;
4392 }
4393
4394 /**
4395  * gtk_drag_check_threshold:
4396  * @widget: a #GtkWidget
4397  * @start_x: X coordinate of start of drag
4398  * @start_y: Y coordinate of start of drag
4399  * @current_x: current X coordinate
4400  * @current_y: current Y coordinate
4401  *
4402  * Checks to see if a mouse drag starting at (@start_x, @start_y) and ending
4403  * at (@current_x, @current_y) has passed the GTK+ drag threshold, and thus
4404  * should trigger the beginning of a drag-and-drop operation.
4405  *
4406  * Return Value: %TRUE if the drag threshold has been passed.
4407  **/
4408 gboolean
4409 gtk_drag_check_threshold (GtkWidget *widget,
4410                           gint       start_x,
4411                           gint       start_y,
4412                           gint       current_x,
4413                           gint       current_y)
4414 {
4415   gint drag_threshold;
4416
4417   g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
4418
4419   g_object_get (gtk_widget_get_settings (widget),
4420                 "gtk-dnd-drag-threshold", &drag_threshold,
4421                 NULL);
4422
4423   return (ABS (current_x - start_x) > drag_threshold ||
4424           ABS (current_y - start_y) > drag_threshold);
4425 }
4426
4427 #define __GTK_DND_C__
4428 #include "gtkaliasdef.c"