Pileus Git - ~andy/gtk/blob - gtk/gtkdnd-quartz.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 #include "gtkdnd.h"
  37 #include "gtkiconfactory.h"
  38 #include "gtkicontheme.h"
  39 #include "gtkimage.h"
  40 #include "gtkinvisible.h"
  41 #include "gtkmain.h"
  42 #include "gtkplug.h"
  43 #include "gtkstock.h"
  44 #include "gtkwindow.h"
  45 #include "gtkintl.h"
  46 #include "gtkquartz.h"
  47 #include "gdk/quartz/gdkquartz.h"
  48
  49 typedef struct _GtkDragSourceSite GtkDragSourceSite;
  50 typedef struct _GtkDragSourceInfo GtkDragSourceInfo;
  51 typedef struct _GtkDragDestSite GtkDragDestSite;
  52 typedef struct _GtkDragDestInfo GtkDragDestInfo;
  53 typedef struct _GtkDragFindData GtkDragFindData;
  54
  55 static void     gtk_drag_find_widget            (GtkWidget        *widget,
  56                                                  GtkDragFindData  *data);
  57 static void     gtk_drag_dest_site_destroy      (gpointer          data);
  58 static void     gtk_drag_dest_leave             (GtkWidget        *widget,
  59                                                  GdkDragContext   *context,
  60                                                  guint             time);
  61 static GtkDragDestInfo *gtk_drag_get_dest_info  (GdkDragContext   *context,
  62                                                  gboolean          create);
  63 static void gtk_drag_source_site_destroy        (gpointer           data);
  64
  65 static GtkDragSourceInfo *gtk_drag_get_source_info (GdkDragContext *context,
  66                                                     gboolean        create);
  67
  68 extern GdkDragContext *gdk_quartz_drag_source_context (); /* gdk/quartz/gdkdnd-quartz.c */
  69
  70 struct _GtkDragSourceSite
  71 {
  72   GdkModifierType    start_button_mask;
  73   GtkTargetList     *target_list;        /* Targets for drag data */
  74   GdkDragAction      actions;            /* Possible actions */
  75
  76   /* Drag icon */
  77   GtkImageType icon_type;
  78   union
  79   {
  80     GtkImagePixbufData pixbuf;
  81     GtkImageStockData stock;
  82     GtkImageIconNameData name;
  83   } icon_data;
  84
  85   /* Stored button press information to detect drag beginning */
  86   gint               state;
  87   gint               x, y;
  88 };
  89
  90 struct _GtkDragSourceInfo
  91 {
  92   GtkWidget         *source_widget;
  93   GtkWidget         *widget;
  94   GtkTargetList     *target_list; /* Targets for drag data */
  95   GdkDragAction      possible_actions; /* Actions allowed by source */
  96   GdkDragContext    *context;     /* drag context */
  97   NSEvent           *nsevent;     /* what started it */
  98   gint hot_x, hot_y;              /* Hot spot for drag */
  99   GdkPixbuf         *icon_pixbuf;
 100   gboolean           success;
 101   gboolean           delete;
 102 };
 103
 104 struct _GtkDragDestSite
 105 {
 106   GtkDestDefaults    flags;
 107   GtkTargetList     *target_list;
 108   GdkDragAction      actions;
 109   guint              have_drag : 1;
 110   guint              track_motion : 1;
 111 };
 112
 113 struct _GtkDragDestInfo
 114 {
 115   GtkWidget         *widget;       /* Widget in which drag is in */
 116   GdkDragContext    *context;      /* Drag context */
 117   guint              dropped : 1;     /* Set after we receive a drop */
 118   gint               drop_x, drop_y; /* Position of drop */
 119 };
 120
 121 struct _GtkDragFindData
 122 {
 123   gint x;
 124   gint y;
 125   GdkDragContext *context;
 126   GtkDragDestInfo *info;
 127   gboolean found;
 128   gboolean toplevel;
 129   gboolean (*callback) (GtkWidget *widget, GdkDragContext *context,
 130                         gint x, gint y, guint32 time);
 131   guint32 time;
 132 };
 133
 134
 135 @interface GtkDragSourceOwner : NSObject {
 136   GtkDragSourceInfo *info;
 137 }
 138
 139 @end
 140
 141 @implementation GtkDragSourceOwner
 142 -(void)pasteboard:(NSPasteboard *)sender provideDataForType:(NSString *)type
 143 {
 144   guint target_info;
 145   GtkSelectionData selection_data;
 146
 147   selection_data.selection = GDK_NONE;
 148   selection_data.data = NULL;
 149   selection_data.length = -1;
 150   selection_data.target = _gtk_quartz_pasteboard_type_to_atom (type);
 151
 152   if (gtk_target_list_find (info->target_list,
 153                             selection_data.target,
 154                             &target_info))
 155     {
 156       g_signal_emit_by_name (info->widget, "drag-data-get",
 157                              info->context,
 158                              &selection_data,
 159                              target_info,
 160                              time);
 161
 162       if (selection_data.length >= 0)
 163         _gtk_quartz_set_selection_data_for_pasteboard (sender, &selection_data);
 164
 165       g_free (selection_data.data);
 166     }
 167 }
 168
 169 - (id)initWithInfo:(GtkDragSourceInfo *)anInfo
 170 {
 171   self = [super init];
 172
 173   if (self)
 174     {
 175       info = anInfo;
 176     }
 177
 178   return self;
 179 }
 180
 181 @end
 182
 183 void
 184 gtk_drag_get_data (GtkWidget      *widget,
 185                    GdkDragContext *context,
 186                    GdkAtom         target,
 187                    guint32         time)
 188 {
 189   id <NSDraggingInfo> dragging_info;
 190   NSPasteboard *pasteboard;
 191   GtkSelectionData *selection_data;
 192   GtkDragDestInfo *info;
 193   GtkDragDestSite *site;
 194
 195   dragging_info = gdk_quartz_drag_context_get_dragging_info_libgtk_only (context);
 196   pasteboard = [dragging_info draggingPasteboard];
 197
 198   info = gtk_drag_get_dest_info (context, FALSE);
 199   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
 200
 201   selection_data = _gtk_quartz_get_selection_data_from_pasteboard (pasteboard,
 202                                                                    target, 0);
 203
 204   if (site && site->target_list)
 205     {
 206       guint target_info;
 207
 208       if (gtk_target_list_find (site->target_list,
 209                                 selection_data->target,
 210                                 &target_info))
 211         {
 212           if (!(site->flags & GTK_DEST_DEFAULT_DROP) ||
 213               selection_data->length >= 0)
 214             g_signal_emit_by_name (widget,
 215                                    "drag-data-received",
 216                                    context, info->drop_x, info->drop_y,
 217                                    selection_data,
 218                                    target_info, time);
 219         }
 220     }
 221   else
 222     {
 223       g_signal_emit_by_name (widget,
 224                              "drag-data-received",
 225                              context, info->drop_x, info->drop_y,
 226                              selection_data,
 227                              0, time);
 228     }
 229
 230   if (site && site->flags & GTK_DEST_DEFAULT_DROP)
 231     {
 232       gtk_drag_finish (context,
 233                        (selection_data->length >= 0),
 234                        (context->action == GDK_ACTION_MOVE),
 235                        time);
 236     }
 237 }
 238
 239 void
 240 gtk_drag_finish (GdkDragContext *context,
 241                  gboolean        success,
 242                  gboolean        del,
 243                  guint32         time)
 244 {
 245   GtkDragSourceInfo *info;
 246   GdkDragContext* source_context = gdk_quartz_drag_source_context ();
 247
 248   if (source_context)
 249     {
 250       info = gtk_drag_get_source_info (source_context, FALSE);
 251       if (info)
 252         {
 253           info->success = success;
 254           info->delete = del;
 255         }
 256     }
 257 }
 258
 259 static void
 260 gtk_drag_dest_info_destroy (gpointer data)
 261 {
 262   GtkDragDestInfo *info = data;
 263
 264   g_free (info);
 265 }
 266
 267 static GtkDragDestInfo *
 268 gtk_drag_get_dest_info (GdkDragContext *context,
 269                         gboolean        create)
 270 {
 271   GtkDragDestInfo *info;
 272   static GQuark info_quark = 0;
 273   if (!info_quark)
 274     info_quark = g_quark_from_static_string ("gtk-dest-info");
 275
 276   info = g_object_get_qdata (G_OBJECT (context), info_quark);
 277   if (!info && create)
 278     {
 279       info = g_new (GtkDragDestInfo, 1);
 280       info->widget = NULL;
 281       info->context = context;
 282       info->dropped = FALSE;
 283       g_object_set_qdata_full (G_OBJECT (context), info_quark,
 284                                info, gtk_drag_dest_info_destroy);
 285     }
 286
 287   return info;
 288 }
 289
 290 static GQuark dest_info_quark = 0;
 291
 292 static GtkDragSourceInfo *
 293 gtk_drag_get_source_info (GdkDragContext *context,
 294                           gboolean        create)
 295 {
 296   GtkDragSourceInfo *info;
 297
 298   if (!dest_info_quark)
 299     dest_info_quark = g_quark_from_static_string ("gtk-source-info");
 300
 301   info = g_object_get_qdata (G_OBJECT (context), dest_info_quark);
 302   if (!info && create)
 303     {
 304       info = g_new0 (GtkDragSourceInfo, 1);
 305       info->context = context;
 306       g_object_set_qdata (G_OBJECT (context), dest_info_quark, info);
 307     }
 308
 309   return info;
 310 }
 311
 312 static void
 313 gtk_drag_clear_source_info (GdkDragContext *context)
 314 {
 315   g_object_set_qdata (G_OBJECT (context), dest_info_quark, NULL);
 316 }
 317
 318 GtkWidget *
 319 gtk_drag_get_source_widget (GdkDragContext *context)
 320 {
 321   GtkDragSourceInfo *info;
 322   GdkDragContext* real_source_context = gdk_quartz_drag_source_context();
 323
 324   if (!real_source_context)
 325     return NULL;
 326
 327   info = gtk_drag_get_source_info (real_source_context, FALSE);
 328   if (!info)
 329      return NULL;
 330
 331   return info->source_widget;
 332 }
 333
 334 /*************************************************************
 335  * gtk_drag_highlight_expose:
 336  *     Callback for expose_event for highlighted widgets.
 337  *   arguments:
 338  *     widget:
 339  *     event:
 340  *     data:
 341  *   results:
 342  *************************************************************/
 343
 344 static gboolean
 345 gtk_drag_highlight_expose (GtkWidget      *widget,
 346                            GdkEventExpose *event,
 347                            gpointer        data)
 348 {
 349   gint x, y, width, height;
 350
 351   if (gtk_widget_is_drawable (widget))
 352     {
 353       cairo_t *cr;
 354       GdkWindow *window = gtk_widget_get_window (widget);
 355
 356       if (!gtk_widget_get_has_window (widget))
 357         {
 358           GtkAllocation allocation;
 359
 360           gtk_widget_get_allocation (widget, &allocation);
 361
 362           x = allocation.x;
 363           y = allocation.y;
 364           width = allocation.width;
 365           height = allocation.height;
 366         }
 367       else
 368         {
 369           x = 0;
 370           y = 0;
 371           gdk_drawable_get_size (window, &width, &height);
 372         }
 373
 374       gtk_paint_shadow (gtk_widget_get_style (widget), window,
 375                         GTK_STATE_NORMAL, GTK_SHADOW_OUT,
 376                         NULL, widget, "dnd",
 377                         x, y, width, height);
 378
 379       cr = gdk_cairo_create (window);
 380       cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); /* black */
 381       cairo_set_line_width (cr, 1.0);
 382       cairo_rectangle (cr,
 383                        x + 0.5, y + 0.5,
 384                        width - 1, height - 1);
 385       cairo_stroke (cr);
 386       cairo_destroy (cr);
 387     }
 388
 389   return FALSE;
 390 }
 391
 392 /*************************************************************
 393  * gtk_drag_highlight:
 394  *     Highlight the given widget in the default manner.
 395  *   arguments:
 396  *     widget:
 397  *   results:
 398  *************************************************************/
 399
 400 void
 401 gtk_drag_highlight (GtkWidget  *widget)
 402 {
 403   g_return_if_fail (GTK_IS_WIDGET (widget));
 404
 405   g_signal_connect_after (widget, "expose-event",
 406                           G_CALLBACK (gtk_drag_highlight_expose),
 407                           NULL);
 408
 409   gtk_widget_queue_draw (widget);
 410 }
 411
 412 /*************************************************************
 413  * gtk_drag_unhighlight:
 414  *     Refresh the given widget to remove the highlight.
 415  *   arguments:
 416  *     widget:
 417  *   results:
 418  *************************************************************/
 419
 420 void
 421 gtk_drag_unhighlight (GtkWidget *widget)
 422 {
 423   g_return_if_fail (GTK_IS_WIDGET (widget));
 424
 425   g_signal_handlers_disconnect_by_func (widget,
 426                                         gtk_drag_highlight_expose,
 427                                         NULL);
 428
 429   gtk_widget_queue_draw (widget);
 430 }
 431
 432 static NSWindow *
 433 get_toplevel_nswindow (GtkWidget *widget)
 434 {
 435   GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
 436   GdkWindow *window = gtk_widget_get_window (toplevel);
 437
 438   if (gtk_widget_is_toplevel (toplevel) && window)
 439     return [gdk_quartz_window_get_nsview (window) window];
 440   else
 441     return NULL;
 442 }
 443
 444 static void
 445 register_types (GtkWidget *widget, GtkDragDestSite *site)
 446 {
 447   if (site->target_list)
 448     {
 449       NSWindow *nswindow = get_toplevel_nswindow (widget);
 450       NSSet *types;
 451       NSAutoreleasePool *pool;
 452
 453       if (!nswindow)
 454         return;
 455
 456       pool = [[NSAutoreleasePool alloc] init];
 457       types = _gtk_quartz_target_list_to_pasteboard_types (site->target_list);
 458
 459       [nswindow registerForDraggedTypes:[types allObjects]];
 460
 461       [types release];
 462       [pool release];
 463     }
 464 }
 465
 466 static void
 467 gtk_drag_dest_realized (GtkWidget *widget,
 468                         gpointer   user_data)
 469 {
 470   GtkDragDestSite *site = user_data;
 471
 472   register_types (widget, site);
 473 }
 474
 475 static void
 476 gtk_drag_dest_hierarchy_changed (GtkWidget *widget,
 477                                  GtkWidget *previous_toplevel,
 478                                  gpointer   user_data)
 479 {
 480   GtkDragDestSite *site = user_data;
 481
 482   register_types (widget, site);
 483 }
 484
 485 static void
 486 gtk_drag_dest_site_destroy (gpointer data)
 487 {
 488   GtkDragDestSite *site = data;
 489
 490   if (site->target_list)
 491     gtk_target_list_unref (site->target_list);
 492
 493   g_free (site);
 494 }
 495
 496 void
 497 gtk_drag_dest_set (GtkWidget            *widget,
 498                    GtkDestDefaults       flags,
 499                    const GtkTargetEntry *targets,
 500                    gint                  n_targets,
 501                    GdkDragAction         actions)
 502 {
 503   GtkDragDestSite *old_site, *site;
 504
 505   g_return_if_fail (GTK_IS_WIDGET (widget));
 506
 507   old_site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
 508
 509   site = g_new (GtkDragDestSite, 1);
 510   site->flags = flags;
 511   site->have_drag = FALSE;
 512   if (targets)
 513     site->target_list = gtk_target_list_new (targets, n_targets);
 514   else
 515     site->target_list = NULL;
 516   site->actions = actions;
 517
 518   if (old_site)
 519     site->track_motion = old_site->track_motion;
 520   else
 521     site->track_motion = FALSE;
 522
 523   gtk_drag_dest_unset (widget);
 524
 525   if (gtk_widget_get_realized (widget))
 526     gtk_drag_dest_realized (widget, site);
 527
 528   g_signal_connect (widget, "realize",
 529                     G_CALLBACK (gtk_drag_dest_realized), site);
 530   g_signal_connect (widget, "hierarchy-changed",
 531                     G_CALLBACK (gtk_drag_dest_hierarchy_changed), site);
 532
 533   g_object_set_data_full (G_OBJECT (widget), I_("gtk-drag-dest"),
 534                           site, gtk_drag_dest_site_destroy);
 535 }
 536
 537 void
 538 gtk_drag_dest_set_proxy (GtkWidget      *widget,
 539                          GdkWindow      *proxy_window,
 540                          GdkDragProtocol protocol,
 541                          gboolean        use_coordinates)
 542 {
 543   g_warning ("gtk_drag_dest_set_proxy is not supported on Mac OS X.");
 544 }
 545
 546 void
 547 gtk_drag_dest_unset (GtkWidget *widget)
 548 {
 549   GtkDragDestSite *old_site;
 550
 551   g_return_if_fail (GTK_IS_WIDGET (widget));
 552
 553   old_site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
 554   if (old_site)
 555     {
 556       g_signal_handlers_disconnect_by_func (widget,
 557                                             gtk_drag_dest_realized,
 558                                             old_site);
 559       g_signal_handlers_disconnect_by_func (widget,
 560                                             gtk_drag_dest_hierarchy_changed,
 561                                             old_site);
 562     }
 563
 564   g_object_set_data (G_OBJECT (widget), I_("gtk-drag-dest"), NULL);
 565 }
 566
 567 GtkTargetList*
 568 gtk_drag_dest_get_target_list (GtkWidget *widget)
 569 {
 570   GtkDragDestSite *site;
 571
 572   g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
 573
 574   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
 575
 576   return site ? site->target_list : NULL;
 577 }
 578
 579 void
 580 gtk_drag_dest_set_target_list (GtkWidget      *widget,
 581                                GtkTargetList  *target_list)
 582 {
 583   GtkDragDestSite *site;
 584
 585   g_return_if_fail (GTK_IS_WIDGET (widget));
 586
 587   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
 588
 589   if (!site)
 590     {
 591       g_warning ("Can't set a target list on a widget until you've called gtk_drag_dest_set() "
 592                  "to make the widget into a drag destination");
 593       return;
 594     }
 595
 596   if (target_list)
 597     gtk_target_list_ref (target_list);
 598
 599   if (site->target_list)
 600     gtk_target_list_unref (site->target_list);
 601
 602   site->target_list = target_list;
 603
 604   register_types (widget, site);
 605 }
 606
 607 void
 608 gtk_drag_dest_add_text_targets (GtkWidget *widget)
 609 {
 610   GtkTargetList *target_list;
 611
 612   target_list = gtk_drag_dest_get_target_list (widget);
 613   if (target_list)
 614     gtk_target_list_ref (target_list);
 615   else
 616     target_list = gtk_target_list_new (NULL, 0);
 617   gtk_target_list_add_text_targets (target_list, 0);
 618   gtk_drag_dest_set_target_list (widget, target_list);
 619   gtk_target_list_unref (target_list);
 620 }
 621
 622 void
 623 gtk_drag_dest_add_image_targets (GtkWidget *widget)
 624 {
 625   GtkTargetList *target_list;
 626
 627   target_list = gtk_drag_dest_get_target_list (widget);
 628   if (target_list)
 629     gtk_target_list_ref (target_list);
 630   else
 631     target_list = gtk_target_list_new (NULL, 0);
 632   gtk_target_list_add_image_targets (target_list, 0, FALSE);
 633   gtk_drag_dest_set_target_list (widget, target_list);
 634   gtk_target_list_unref (target_list);
 635 }
 636
 637 void
 638 gtk_drag_dest_add_uri_targets (GtkWidget *widget)
 639 {
 640   GtkTargetList *target_list;
 641
 642   target_list = gtk_drag_dest_get_target_list (widget);
 643   if (target_list)
 644     gtk_target_list_ref (target_list);
 645   else
 646     target_list = gtk_target_list_new (NULL, 0);
 647   gtk_target_list_add_uri_targets (target_list, 0);
 648   gtk_drag_dest_set_target_list (widget, target_list);
 649   gtk_target_list_unref (target_list);
 650 }
 651
 652 static void
 653 prepend_and_ref_widget (GtkWidget *widget,
 654                         gpointer   data)
 655 {
 656   GSList **slist_p = data;
 657
 658   *slist_p = g_slist_prepend (*slist_p, g_object_ref (widget));
 659 }
 660
 661 static void
 662 gtk_drag_find_widget (GtkWidget       *widget,
 663                       GtkDragFindData *data)
 664 {
 665   GtkAllocation new_allocation;
 666   gint allocation_to_window_x = 0;
 667   gint allocation_to_window_y = 0;
 668   gint x_offset = 0;
 669   gint y_offset = 0;
 670
 671   if (data->found || !gtk_widget_get_mapped (widget) || !gtk_widget_get_sensitive (widget))
 672     return;
 673
 674   /* Note that in the following code, we only count the
 675    * position as being inside a WINDOW widget if it is inside
 676    * widget->window; points that are outside of widget->window
 677    * but within the allocation are not counted. This is consistent
 678    * with the way we highlight drag targets.
 679    *
 680    * data->x,y are relative to widget->parent->window (if
 681    * widget is not a toplevel, widget->window otherwise).
 682    * We compute the allocation of widget in the same coordinates,
 683    * clipping to widget->window, and all intermediate
 684    * windows. If data->x,y is inside that, then we translate
 685    * our coordinates to be relative to widget->window and
 686    * recurse.
 687    */
 688   gtk_widget_get_allocation (widget, &new_allocation);
 689
 690   if (gtk_widget_get_parent (widget))
 691     {
 692       gint tx, ty;
 693       GdkWindow *window = gtk_widget_get_window (widget);
 694       GdkWindow *parent_window;
 695       GtkAllocation allocation;
 696
 697       parent_window = gtk_widget_get_window (gtk_widget_get_parent (widget));
 698
 699       /* Compute the offset from allocation-relative to
 700        * window-relative coordinates.
 701        */
 702       gtk_widget_get_allocation (widget, &allocation);
 703       allocation_to_window_x = allocation.x;
 704       allocation_to_window_y = allocation.y;
 705
 706       if (gtk_widget_get_has_window (widget))
 707         {
 708           /* The allocation is relative to the parent window for
 709            * window widgets, not to widget->window.
 710            */
 711           gdk_window_get_position (window, &tx, &ty);
 712
 713           allocation_to_window_x -= tx;
 714           allocation_to_window_y -= ty;
 715         }
 716
 717       new_allocation.x = 0 + allocation_to_window_x;
 718       new_allocation.y = 0 + allocation_to_window_y;
 719
 720       while (window && window != parent_window)
 721         {
 722           GdkRectangle window_rect = { 0, 0, 0, 0 };
 723
 724           gdk_drawable_get_size (window, &window_rect.width, &window_rect.height);
 725
 726           gdk_rectangle_intersect (&new_allocation, &window_rect, &new_allocation);
 727
 728           gdk_window_get_position (window, &tx, &ty);
 729           new_allocation.x += tx;
 730           x_offset += tx;
 731           new_allocation.y += ty;
 732           y_offset += ty;
 733
 734           window = gdk_window_get_parent (window);
 735         }
 736
 737       if (!window)              /* Window and widget heirarchies didn't match. */
 738         return;
 739     }
 740
 741   if (data->toplevel ||
 742       ((data->x >= new_allocation.x) && (data->y >= new_allocation.y) &&
 743        (data->x < new_allocation.x + new_allocation.width) &&
 744        (data->y < new_allocation.y + new_allocation.height)))
 745     {
 746       /* First, check if the drag is in a valid drop site in
 747        * one of our children
 748        */
 749       if (GTK_IS_CONTAINER (widget))
 750         {
 751           GtkDragFindData new_data = *data;
 752           GSList *children = NULL;
 753           GSList *tmp_list;
 754
 755           new_data.x -= x_offset;
 756           new_data.y -= y_offset;
 757           new_data.found = FALSE;
 758           new_data.toplevel = FALSE;
 759
 760           /* need to reference children temporarily in case the
 761            * ::drag-motion/::drag-drop callbacks change the widget hierarchy.
 762            */
 763           gtk_container_forall (GTK_CONTAINER (widget), prepend_and_ref_widget, &children);
 764           for (tmp_list = children; tmp_list; tmp_list = tmp_list->next)
 765             {
 766               if (!new_data.found && gtk_widget_is_drawable (tmp_list->data))
 767                 gtk_drag_find_widget (tmp_list->data, &new_data);
 768               g_object_unref (tmp_list->data);
 769             }
 770           g_slist_free (children);
 771
 772           data->found = new_data.found;
 773         }
 774
 775       /* If not, and this widget is registered as a drop site, check to
 776        * emit "drag-motion" to check if we are actually in
 777        * a drop site.
 778        */
 779       if (!data->found &&
 780           g_object_get_data (G_OBJECT (widget), "gtk-drag-dest"))
 781         {
 782           data->found = data->callback (widget,
 783                                         data->context,
 784                                         data->x - x_offset - allocation_to_window_x,
 785                                         data->y - y_offset - allocation_to_window_y,
 786                                         data->time);
 787           /* If so, send a "drag-leave" to the last widget */
 788           if (data->found)
 789             {
 790               if (data->info->widget && data->info->widget != widget)
 791                 {
 792                   gtk_drag_dest_leave (data->info->widget, data->context, data->time);
 793                 }
 794               data->info->widget = widget;
 795             }
 796         }
 797     }
 798 }
 799
 800 static void
 801 gtk_drag_dest_leave (GtkWidget      *widget,
 802                      GdkDragContext *context,
 803                      guint           time)
 804 {
 805   GtkDragDestSite *site;
 806
 807   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
 808   g_return_if_fail (site != NULL);
 809
 810   if ((site->flags & GTK_DEST_DEFAULT_HIGHLIGHT) && site->have_drag)
 811     gtk_drag_unhighlight (widget);
 812
 813   if (!(site->flags & GTK_DEST_DEFAULT_MOTION) || site->have_drag ||
 814       site->track_motion)
 815     g_signal_emit_by_name (widget, "drag-leave", context, time);
 816
 817   site->have_drag = FALSE;
 818 }
 819
 820 static gboolean
 821 gtk_drag_dest_motion (GtkWidget      *widget,
 822                       GdkDragContext *context,
 823                       gint            x,
 824                       gint            y,
 825                       guint           time)
 826 {
 827   GtkDragDestSite *site;
 828   GdkDragAction action = 0;
 829   gboolean retval;
 830
 831   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
 832   g_return_val_if_fail (site != NULL, FALSE);
 833
 834   if (site->track_motion || site->flags & GTK_DEST_DEFAULT_MOTION)
 835     {
 836       if (context->suggested_action & site->actions)
 837         action = context->suggested_action;
 838
 839       if (action && gtk_drag_dest_find_target (widget, context, NULL))
 840         {
 841           if (!site->have_drag)
 842             {
 843               site->have_drag = TRUE;
 844               if (site->flags & GTK_DEST_DEFAULT_HIGHLIGHT)
 845                 gtk_drag_highlight (widget);
 846             }
 847
 848           gdk_drag_status (context, action, time);
 849         }
 850       else
 851         {
 852           gdk_drag_status (context, 0, time);
 853           if (!site->track_motion)
 854             return TRUE;
 855         }
 856     }
 857
 858   g_signal_emit_by_name (widget, "drag-motion",
 859                          context, x, y, time, &retval);
 860
 861   return (site->flags & GTK_DEST_DEFAULT_MOTION) ? TRUE : retval;
 862 }
 863
 864 static gboolean
 865 gtk_drag_dest_drop (GtkWidget        *widget,
 866                     GdkDragContext   *context,
 867                     gint              x,
 868                     gint              y,
 869                     guint             time)
 870 {
 871   GtkDragDestSite *site;
 872   GtkDragDestInfo *info;
 873   gboolean retval;
 874
 875   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
 876   g_return_val_if_fail (site != NULL, FALSE);
 877
 878   info = gtk_drag_get_dest_info (context, FALSE);
 879   g_return_val_if_fail (info != NULL, FALSE);
 880
 881   info->drop_x = x;
 882   info->drop_y = y;
 883
 884   if (site->flags & GTK_DEST_DEFAULT_DROP)
 885     {
 886       GdkAtom target = gtk_drag_dest_find_target (widget, context, NULL);
 887
 888       if (target == GDK_NONE)
 889         {
 890           gtk_drag_finish (context, FALSE, FALSE, time);
 891           return TRUE;
 892         }
 893       else
 894         gtk_drag_get_data (widget, context, target, time);
 895     }
 896
 897   g_signal_emit_by_name (widget, "drag-drop",
 898                          context, x, y, time, &retval);
 899
 900   return (site->flags & GTK_DEST_DEFAULT_DROP) ? TRUE : retval;
 901 }
 902
 903 void
 904 gtk_drag_dest_set_track_motion (GtkWidget *widget,
 905                                 gboolean   track_motion)
 906 {
 907   GtkDragDestSite *site;
 908
 909   g_return_if_fail (GTK_IS_WIDGET (widget));
 910
 911   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
 912
 913   g_return_if_fail (site != NULL);
 914
 915   site->track_motion = track_motion != FALSE;
 916 }
 917
 918 gboolean
 919 gtk_drag_dest_get_track_motion (GtkWidget *widget)
 920 {
 921   GtkDragDestSite *site;
 922
 923   g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
 924
 925   site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
 926
 927   if (site)
 928     return site->track_motion;
 929
 930   return FALSE;
 931 }
 932
 933 void
 934 _gtk_drag_dest_handle_event (GtkWidget *toplevel,
 935                              GdkEvent  *event)
 936 {
 937   GtkDragDestInfo *info;
 938   GdkDragContext *context;
 939
 940   g_return_if_fail (toplevel != NULL);
 941   g_return_if_fail (event != NULL);
 942
 943   context = event->dnd.context;
 944
 945   info = gtk_drag_get_dest_info (context, TRUE);
 946
 947   /* Find the widget for the event */
 948   switch (event->type)
 949     {
 950     case GDK_DRAG_ENTER:
 951       break;
 952
 953     case GDK_DRAG_LEAVE:
 954       if (info->widget)
 955         {
 956           gtk_drag_dest_leave (info->widget, context, event->dnd.time);
 957           info->widget = NULL;
 958         }
 959       break;
 960
 961     case GDK_DRAG_MOTION:
 962     case GDK_DROP_START:
 963       {
 964         GtkDragFindData data;
 965         gint tx, ty;
 966
 967         if (event->type == GDK_DROP_START)
 968           {
 969             info->dropped = TRUE;
 970             /* We send a leave here so that the widget unhighlights
 971              * properly.
 972              */
 973             if (info->widget)
 974               {
 975                 gtk_drag_dest_leave (info->widget, context, event->dnd.time);
 976                 info->widget = NULL;
 977               }
 978           }
 979
 980         gdk_window_get_position (gtk_widget_get_window (toplevel), &tx, &ty);
 981
 982         data.x = event->dnd.x_root - tx;
 983         data.y = event->dnd.y_root - ty;
 984         data.context = context;
 985         data.info = info;
 986         data.found = FALSE;
 987         data.toplevel = TRUE;
 988         data.callback = (event->type == GDK_DRAG_MOTION) ?
 989           gtk_drag_dest_motion : gtk_drag_dest_drop;
 990         data.time = event->dnd.time;
 991
 992         gtk_drag_find_widget (toplevel, &data);
 993
 994         if (info->widget && !data.found)
 995           {
 996             gtk_drag_dest_leave (info->widget, context, event->dnd.time);
 997             info->widget = NULL;
 998           }
 999
1000         /* Send a reply.
1001          */
1002         if (event->type == GDK_DRAG_MOTION)
1003           {
1004             if (!data.found)
1005               gdk_drag_status (context, 0, event->dnd.time);
1006           }
1007
1008         break;
1009       default:
1010         g_assert_not_reached ();
1011       }
1012     }
1013 }
1014
1015
1016 GdkAtom
1017 gtk_drag_dest_find_target (GtkWidget      *widget,
1018                            GdkDragContext *context,
1019                            GtkTargetList  *target_list)
1020 {
1021   id <NSDraggingInfo> dragging_info;
1022   NSPasteboard *pasteboard;
1023   GtkWidget *source_widget;
1024   GList *tmp_target;
1025   GList *tmp_source = NULL;
1026   GList *source_targets;
1027
1028   g_return_val_if_fail (GTK_IS_WIDGET (widget), GDK_NONE);
1029   g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), GDK_NONE);
1030   g_return_val_if_fail (!context->is_source, GDK_NONE);
1031
1032   dragging_info = gdk_quartz_drag_context_get_dragging_info_libgtk_only (context);
1033   pasteboard = [dragging_info draggingPasteboard];
1034
1035   source_widget = gtk_drag_get_source_widget (context);
1036
1037   if (target_list == NULL)
1038     target_list = gtk_drag_dest_get_target_list (widget);
1039
1040   if (target_list == NULL)
1041     return GDK_NONE;
1042
1043   source_targets = _gtk_quartz_pasteboard_types_to_atom_list ([pasteboard types]);
1044   tmp_target = target_list->list;
1045   while (tmp_target)
1046     {
1047       GtkTargetPair *pair = tmp_target->data;
1048       tmp_source = source_targets;
1049       while (tmp_source)
1050         {
1051           if (tmp_source->data == GUINT_TO_POINTER (pair->target))
1052             {
1053               if ((!(pair->flags & GTK_TARGET_SAME_APP) || source_widget) &&
1054                   (!(pair->flags & GTK_TARGET_SAME_WIDGET) || (source_widget == widget)))
1055                 {
1056                   g_list_free (source_targets);
1057                   return pair->target;
1058                 }
1059               else
1060                 break;
1061             }
1062           tmp_source = tmp_source->next;
1063         }
1064       tmp_target = tmp_target->next;
1065     }
1066
1067   g_list_free (source_targets);
1068   return GDK_NONE;
1069 }
1070
1071 static gboolean
1072 gtk_drag_begin_idle (gpointer arg)
1073 {
1074   NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
1075   GdkDragContext* context = (GdkDragContext*) arg;
1076   GtkDragSourceInfo* info = gtk_drag_get_source_info (context, FALSE);
1077   NSWindow *nswindow;
1078   NSPasteboard *pasteboard;
1079   GtkDragSourceOwner *owner;
1080   NSPoint point;
1081   NSSet *types;
1082   NSImage *drag_image;
1083
1084   g_assert (info != NULL);
1085
1086   pasteboard = [NSPasteboard pasteboardWithName:NSDragPboard];
1087   owner = [[GtkDragSourceOwner alloc] initWithInfo:info];
1088
1089   types = _gtk_quartz_target_list_to_pasteboard_types (info->target_list);
1090
1091   [pasteboard declareTypes:[types allObjects] owner:owner];
1092
1093   [owner release];
1094   [types release];
1095
1096   if ((nswindow = get_toplevel_nswindow (info->source_widget)) == NULL)
1097      return FALSE;
1098
1099   /* Ref the context. It's unreffed when the drag has been aborted */
1100   g_object_ref (info->context);
1101
1102   /* FIXME: If the event isn't a mouse event, use the global cursor position instead */
1103   point = [info->nsevent locationInWindow];
1104
1105   drag_image = _gtk_quartz_create_image_from_pixbuf (info->icon_pixbuf);
1106
1107   [nswindow dragImage:drag_image
1108                    at:point
1109                offset:NSMakeSize(0, 0)
1110                 event:info->nsevent
1111            pasteboard:pasteboard
1112                source:nswindow
1113             slideBack:YES];
1114
1115   [info->nsevent release];
1116   [drag_image release];
1117
1118   [pool release];
1119
1120   return FALSE;
1121 }
1122
1123 static GdkDragContext *
1124 gtk_drag_begin_internal (GtkWidget         *widget,
1125                          GtkDragSourceSite *site,
1126                          GtkTargetList     *target_list,
1127                          GdkDragAction      actions,
1128                          gint               button,
1129                          GdkEvent          *event)
1130 {
1131   GtkDragSourceInfo *info;
1132   GdkDragContext *context;
1133   NSWindow *nswindow;
1134
1135   context = gdk_drag_begin (NULL, NULL);
1136   context->is_source = TRUE;
1137
1138   info = gtk_drag_get_source_info (context, TRUE);
1139
1140   info->source_widget = g_object_ref (widget);
1141   info->widget = g_object_ref (widget);
1142   info->target_list = target_list;
1143   gtk_target_list_ref (target_list);
1144
1145   info->possible_actions = actions;
1146
1147   g_signal_emit_by_name (widget, "drag-begin", info->context);
1148
1149   /* Ensure that we have an icon before we start the drag; the
1150    * application may have set one in ::drag_begin, or it may
1151    * not have set one.
1152    */
1153   if (!info->icon_pixbuf)
1154     {
1155       if (!site || site->icon_type == GTK_IMAGE_EMPTY)
1156         gtk_drag_set_icon_default (context);
1157       else
1158         switch (site->icon_type)
1159           {
1160           case GTK_IMAGE_PIXBUF:
1161             gtk_drag_set_icon_pixbuf (context,
1162                                       site->icon_data.pixbuf.pixbuf,
1163                                       -2, -2);
1164             break;
1165           case GTK_IMAGE_STOCK:
1166             gtk_drag_set_icon_stock (context,
1167                                      site->icon_data.stock.stock_id,
1168                                      -2, -2);
1169             break;
1170           case GTK_IMAGE_ICON_NAME:
1171             gtk_drag_set_icon_name (context,
1172                                     site->icon_data.name.icon_name,
1173                                     -2, -2);
1174             break;
1175           case GTK_IMAGE_EMPTY:
1176           default:
1177             g_assert_not_reached();
1178             break;
1179           }
1180     }
1181
1182   nswindow = get_toplevel_nswindow (widget);
1183   info->nsevent = [nswindow currentEvent];
1184   [info->nsevent retain];
1185
1186   /* drag will begin in an idle handler to avoid nested run loops */
1187
1188   g_idle_add_full (G_PRIORITY_HIGH_IDLE, gtk_drag_begin_idle, context, NULL);
1189
1190   gdk_pointer_ungrab (0);
1191
1192   return context;
1193 }
1194
1195 GdkDragContext *
1196 gtk_drag_begin (GtkWidget         *widget,
1197                 GtkTargetList     *targets,
1198                 GdkDragAction      actions,
1199                 gint               button,
1200                 GdkEvent          *event)
1201 {
1202   g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
1203   g_return_val_if_fail (gtk_widget_get_realized (widget), NULL);
1204   g_return_val_if_fail (targets != NULL, NULL);
1205
1206   return gtk_drag_begin_internal (widget, NULL, targets,
1207                                   actions, button, event);
1208 }
1209
1210
1211 static gboolean
1212 gtk_drag_source_event_cb (GtkWidget      *widget,
1213                           GdkEvent       *event,
1214                           gpointer        data)
1215 {
1216   GtkDragSourceSite *site;
1217   gboolean retval = FALSE;
1218   site = (GtkDragSourceSite *)data;
1219
1220   switch (event->type)
1221     {
1222     case GDK_BUTTON_PRESS:
1223       if ((GDK_BUTTON1_MASK << (event->button.button - 1)) & site->start_button_mask)
1224         {
1225           site->state |= (GDK_BUTTON1_MASK << (event->button.button - 1));
1226           site->x = event->button.x;
1227           site->y = event->button.y;
1228         }
1229       break;
1230
1231     case GDK_BUTTON_RELEASE:
1232       if ((GDK_BUTTON1_MASK << (event->button.button - 1)) & site->start_button_mask)
1233         site->state &= ~(GDK_BUTTON1_MASK << (event->button.button - 1));
1234       break;
1235
1236     case GDK_MOTION_NOTIFY:
1237       if (site->state & event->motion.state & site->start_button_mask)
1238         {
1239           /* FIXME: This is really broken and can leave us
1240            * with a stuck grab
1241            */
1242           int i;
1243           for (i=1; i<6; i++)
1244             {
1245               if (site->state & event->motion.state &
1246                   GDK_BUTTON1_MASK << (i - 1))
1247                 break;
1248             }
1249
1250           if (gtk_drag_check_threshold (widget, site->x, site->y,
1251                                         event->motion.x, event->motion.y))
1252             {
1253               site->state = 0;
1254               gtk_drag_begin_internal (widget, site, site->target_list,
1255                                        site->actions,
1256                                        i, event);
1257
1258               retval = TRUE;
1259             }
1260         }
1261       break;
1262
1263     default:                    /* hit for 2/3BUTTON_PRESS */
1264       break;
1265     }
1266
1267   return retval;
1268 }
1269
1270 void
1271 gtk_drag_source_set (GtkWidget            *widget,
1272                      GdkModifierType       start_button_mask,
1273                      const GtkTargetEntry *targets,
1274                      gint                  n_targets,
1275                      GdkDragAction         actions)
1276 {
1277   GtkDragSourceSite *site;
1278
1279   g_return_if_fail (GTK_IS_WIDGET (widget));
1280
1281   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
1282
1283   gtk_widget_add_events (widget,
1284                          gtk_widget_get_events (widget) |
1285                          GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
1286                          GDK_BUTTON_MOTION_MASK);
1287
1288   if (site)
1289     {
1290       if (site->target_list)
1291         gtk_target_list_unref (site->target_list);
1292     }
1293   else
1294     {
1295       site = g_new0 (GtkDragSourceSite, 1);
1296
1297       site->icon_type = GTK_IMAGE_EMPTY;
1298
1299       g_signal_connect (widget, "button-press-event",
1300                         G_CALLBACK (gtk_drag_source_event_cb),
1301                         site);
1302       g_signal_connect (widget, "button-release-event",
1303                         G_CALLBACK (gtk_drag_source_event_cb),
1304                         site);
1305       g_signal_connect (widget, "motion-notify-event",
1306                         G_CALLBACK (gtk_drag_source_event_cb),
1307                         site);
1308
1309       g_object_set_data_full (G_OBJECT (widget),
1310                               I_("gtk-site-data"),
1311                               site, gtk_drag_source_site_destroy);
1312     }
1313
1314   site->start_button_mask = start_button_mask;
1315
1316   site->target_list = gtk_target_list_new (targets, n_targets);
1317
1318   site->actions = actions;
1319 }
1320
1321 /*************************************************************
1322  * gtk_drag_source_unset
1323  *     Unregister this widget as a drag source.
1324  *   arguments:
1325  *     widget:
1326  *   results:
1327  *************************************************************/
1328
1329 void
1330 gtk_drag_source_unset (GtkWidget *widget)
1331 {
1332   GtkDragSourceSite *site;
1333
1334   g_return_if_fail (GTK_IS_WIDGET (widget));
1335
1336   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
1337
1338   if (site)
1339     {
1340       g_signal_handlers_disconnect_by_func (widget,
1341                                             gtk_drag_source_event_cb,
1342                                             site);
1343       g_object_set_data (G_OBJECT (widget), I_("gtk-site-data"), NULL);
1344     }
1345 }
1346
1347 GtkTargetList *
1348 gtk_drag_source_get_target_list (GtkWidget *widget)
1349 {
1350   GtkDragSourceSite *site;
1351
1352   g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
1353
1354   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
1355
1356   return site ? site->target_list : NULL;
1357
1358 }
1359
1360 void
1361 gtk_drag_source_set_target_list (GtkWidget     *widget,
1362                                  GtkTargetList *target_list)
1363 {
1364   GtkDragSourceSite *site;
1365
1366   g_return_if_fail (GTK_IS_WIDGET (widget));
1367
1368   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
1369   if (site == NULL)
1370     {
1371       g_warning ("gtk_drag_source_set_target_list() requires the widget "
1372                  "to already be a drag source.");
1373       return;
1374     }
1375
1376   if (target_list)
1377     gtk_target_list_ref (target_list);
1378
1379   if (site->target_list)
1380     gtk_target_list_unref (site->target_list);
1381
1382   site->target_list = target_list;
1383 }
1384
1385 /**
1386  * gtk_drag_source_add_text_targets:
1387  * @widget: a #GtkWidget that's is a drag source
1388  *
1389  * Add the text targets supported by #GtkSelection to
1390  * the target list of the drag source.  The targets
1391  * are added with @info = 0. If you need another value,
1392  * use gtk_target_list_add_text_targets() and
1393  * gtk_drag_source_set_target_list().
1394  *
1395  * Since: 2.6
1396  **/
1397 void
1398 gtk_drag_source_add_text_targets (GtkWidget *widget)
1399 {
1400   GtkTargetList *target_list;
1401
1402   target_list = gtk_drag_source_get_target_list (widget);
1403   if (target_list)
1404     gtk_target_list_ref (target_list);
1405   else
1406     target_list = gtk_target_list_new (NULL, 0);
1407   gtk_target_list_add_text_targets (target_list, 0);
1408   gtk_drag_source_set_target_list (widget, target_list);
1409   gtk_target_list_unref (target_list);
1410 }
1411
1412 void
1413 gtk_drag_source_add_image_targets (GtkWidget *widget)
1414 {
1415   GtkTargetList *target_list;
1416
1417   target_list = gtk_drag_source_get_target_list (widget);
1418   if (target_list)
1419     gtk_target_list_ref (target_list);
1420   else
1421     target_list = gtk_target_list_new (NULL, 0);
1422   gtk_target_list_add_image_targets (target_list, 0, TRUE);
1423   gtk_drag_source_set_target_list (widget, target_list);
1424   gtk_target_list_unref (target_list);
1425 }
1426
1427 void
1428 gtk_drag_source_add_uri_targets (GtkWidget *widget)
1429 {
1430   GtkTargetList *target_list;
1431
1432   target_list = gtk_drag_source_get_target_list (widget);
1433   if (target_list)
1434     gtk_target_list_ref (target_list);
1435   else
1436     target_list = gtk_target_list_new (NULL, 0);
1437   gtk_target_list_add_uri_targets (target_list, 0);
1438   gtk_drag_source_set_target_list (widget, target_list);
1439   gtk_target_list_unref (target_list);
1440 }
1441
1442 static void
1443 gtk_drag_source_unset_icon (GtkDragSourceSite *site)
1444 {
1445   switch (site->icon_type)
1446     {
1447     case GTK_IMAGE_EMPTY:
1448       break;
1449     case GTK_IMAGE_PIXBUF:
1450       g_object_unref (site->icon_data.pixbuf.pixbuf);
1451       break;
1452     case GTK_IMAGE_STOCK:
1453       g_free (site->icon_data.stock.stock_id);
1454       break;
1455     case GTK_IMAGE_ICON_NAME:
1456       g_free (site->icon_data.name.icon_name);
1457       break;
1458     default:
1459       g_assert_not_reached();
1460       break;
1461     }
1462   site->icon_type = GTK_IMAGE_EMPTY;
1463 }
1464
1465 static void
1466 gtk_drag_source_site_destroy (gpointer data)
1467 {
1468   GtkDragSourceSite *site = data;
1469
1470   if (site->target_list)
1471     gtk_target_list_unref (site->target_list);
1472
1473   gtk_drag_source_unset_icon (site);
1474   g_free (site);
1475 }
1476
1477 void
1478 gtk_drag_source_set_icon_pixbuf (GtkWidget   *widget,
1479                                  GdkPixbuf   *pixbuf)
1480 {
1481   GtkDragSourceSite *site;
1482
1483   g_return_if_fail (GTK_IS_WIDGET (widget));
1484   g_return_if_fail (GDK_IS_PIXBUF (pixbuf));
1485
1486   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
1487   g_return_if_fail (site != NULL);
1488   g_object_ref (pixbuf);
1489
1490   gtk_drag_source_unset_icon (site);
1491
1492   site->icon_type = GTK_IMAGE_PIXBUF;
1493   site->icon_data.pixbuf.pixbuf = pixbuf;
1494 }
1495
1496 /**
1497  * gtk_drag_source_set_icon_stock:
1498  * @widget: a #GtkWidget
1499  * @stock_id: the ID of the stock icon to use
1500  *
1501  * Sets the icon that will be used for drags from a particular source
1502  * to a stock icon.
1503  **/
1504 void
1505 gtk_drag_source_set_icon_stock (GtkWidget   *widget,
1506                                 const gchar *stock_id)
1507 {
1508   GtkDragSourceSite *site;
1509
1510   g_return_if_fail (GTK_IS_WIDGET (widget));
1511   g_return_if_fail (stock_id != NULL);
1512
1513   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
1514   g_return_if_fail (site != NULL);
1515
1516   gtk_drag_source_unset_icon (site);
1517
1518   site->icon_type = GTK_IMAGE_STOCK;
1519   site->icon_data.stock.stock_id = g_strdup (stock_id);
1520 }
1521
1522 /**
1523  * gtk_drag_source_set_icon_name:
1524  * @widget: a #GtkWidget
1525  * @icon_name: name of icon to use
1526  *
1527  * Sets the icon that will be used for drags from a particular source
1528  * to a themed icon. See the docs for #GtkIconTheme for more details.
1529  *
1530  * Since: 2.8
1531  **/
1532 void
1533 gtk_drag_source_set_icon_name (GtkWidget   *widget,
1534                                const gchar *icon_name)
1535 {
1536   GtkDragSourceSite *site;
1537
1538   g_return_if_fail (GTK_IS_WIDGET (widget));
1539   g_return_if_fail (icon_name != NULL);
1540
1541   site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
1542   g_return_if_fail (site != NULL);
1543
1544   gtk_drag_source_unset_icon (site);
1545
1546   site->icon_type = GTK_IMAGE_ICON_NAME;
1547   site->icon_data.name.icon_name = g_strdup (icon_name);
1548 }
1549
1550
1551 /**
1552  * gtk_drag_set_icon_widget:
1553  * @context: the context for a drag. (This must be called
1554           with a  context for the source side of a drag)
1555  * @widget: a toplevel window to use as an icon.
1556  * @hot_x: the X offset within @widget of the hotspot.
1557  * @hot_y: the Y offset within @widget of the hotspot.
1558  *
1559  * Changes the icon for a widget to a given widget. GTK+
1560  * will not destroy the icon, so if you don't want
1561  * it to persist, you should connect to the "drag-end"
1562  * signal and destroy it yourself.
1563  **/
1564 void
1565 gtk_drag_set_icon_widget (GdkDragContext    *context,
1566                           GtkWidget         *widget,
1567                           gint               hot_x,
1568                           gint               hot_y)
1569 {
1570   g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
1571   g_return_if_fail (context->is_source);
1572   g_return_if_fail (GTK_IS_WIDGET (widget));
1573
1574   g_warning ("gtk_drag_set_icon_widget is not supported on Mac OS X");
1575 }
1576
1577 static void
1578 set_icon_stock_pixbuf (GdkDragContext    *context,
1579                        const gchar       *stock_id,
1580                        GdkPixbuf         *pixbuf,
1581                        gint               hot_x,
1582                        gint               hot_y)
1583 {
1584   GtkDragSourceInfo *info;
1585
1586   info = gtk_drag_get_source_info (context, FALSE);
1587
1588   if (stock_id)
1589     {
1590       pixbuf = gtk_widget_render_icon (info->widget, stock_id,
1591                                        GTK_ICON_SIZE_DND, NULL);
1592
1593       if (!pixbuf)
1594         {
1595           g_warning ("Cannot load drag icon from stock_id %s", stock_id);
1596           return;
1597         }
1598     }
1599   else
1600     g_object_ref (pixbuf);
1601
1602   if (info->icon_pixbuf)
1603     g_object_unref (info->icon_pixbuf);
1604   info->icon_pixbuf = pixbuf;
1605   info->hot_x = hot_x;
1606   info->hot_y = hot_y;
1607 }
1608
1609 /**
1610  * gtk_drag_set_icon_pixbuf:
1611  * @context: the context for a drag. (This must be called
1612  *            with a  context for the source side of a drag)
1613  * @pixbuf: the #GdkPixbuf to use as the drag icon.
1614  * @hot_x: the X offset within @widget of the hotspot.
1615  * @hot_y: the Y offset within @widget of the hotspot.
1616  *
1617  * Sets @pixbuf as the icon for a given drag.
1618  **/
1619 void
1620 gtk_drag_set_icon_pixbuf  (GdkDragContext *context,
1621                            GdkPixbuf      *pixbuf,
1622                            gint            hot_x,
1623                            gint            hot_y)
1624 {
1625   g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
1626   g_return_if_fail (context->is_source);
1627   g_return_if_fail (GDK_IS_PIXBUF (pixbuf));
1628
1629   set_icon_stock_pixbuf (context, NULL, pixbuf, hot_x, hot_y);
1630 }
1631
1632 /**
1633  * gtk_drag_set_icon_stock:
1634  * @context: the context for a drag. (This must be called
1635  *            with a  context for the source side of a drag)
1636  * @stock_id: the ID of the stock icon to use for the drag.
1637  * @hot_x: the X offset within the icon of the hotspot.
1638  * @hot_y: the Y offset within the icon of the hotspot.
1639  *
1640  * Sets the icon for a given drag from a stock ID.
1641  **/
1642 void
1643 gtk_drag_set_icon_stock  (GdkDragContext *context,
1644                           const gchar    *stock_id,
1645                           gint            hot_x,
1646                           gint            hot_y)
1647 {
1648
1649   g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
1650   g_return_if_fail (context->is_source);
1651   g_return_if_fail (stock_id != NULL);
1652
1653   set_icon_stock_pixbuf (context, stock_id, NULL, hot_x, hot_y);
1654 }
1655
1656 /**
1657  * gtk_drag_set_icon_name:
1658  * @context: the context for a drag. (This must be called
1659  *            with a context for the source side of a drag)
1660  * @icon_name: name of icon to use
1661  * @hot_x: the X offset of the hotspot within the icon
1662  * @hot_y: the Y offset of the hotspot within the icon
1663  *
1664  * Sets the icon for a given drag from a named themed icon. See
1665  * the docs for #GtkIconTheme for more details. Note that the
1666  * size of the icon depends on the icon theme (the icon is
1667  * loaded at the symbolic size #GTK_ICON_SIZE_DND), thus
1668  * @hot_x and @hot_y have to be used with care.
1669  *
1670  * Since: 2.8
1671  **/
1672 void
1673 gtk_drag_set_icon_name (GdkDragContext *context,
1674                         const gchar    *icon_name,
1675                         gint            hot_x,
1676                         gint            hot_y)
1677 {
1678   GdkScreen *screen;
1679   GtkSettings *settings;
1680   GtkIconTheme *icon_theme;
1681   GdkPixbuf *pixbuf;
1682   gint width, height, icon_size;
1683
1684   g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
1685   g_return_if_fail (context->is_source);
1686   g_return_if_fail (icon_name != NULL);
1687
1688   screen = gdk_window_get_screen (context->source_window);
1689   g_return_if_fail (screen != NULL);
1690
1691   settings = gtk_settings_get_for_screen (screen);
1692   if (gtk_icon_size_lookup_for_settings (settings,
1693                                          GTK_ICON_SIZE_DND,
1694                                          &width, &height))
1695     icon_size = MAX (width, height);
1696   else
1697     icon_size = 32; /* default value for GTK_ICON_SIZE_DND */
1698
1699   icon_theme = gtk_icon_theme_get_for_screen (screen);
1700
1701   pixbuf = gtk_icon_theme_load_icon (icon_theme, icon_name,
1702                                      icon_size, 0, NULL);
1703   if (pixbuf)
1704     set_icon_stock_pixbuf (context, NULL, pixbuf, hot_x, hot_y);
1705   else
1706     g_warning ("Cannot load drag icon from icon name %s", icon_name);
1707 }
1708
1709 /**
1710  * gtk_drag_set_icon_default:
1711  * @context: the context for a drag. (This must be called
1712              with a  context for the source side of a drag)
1713  *
1714  * Sets the icon for a particular drag to the default
1715  * icon.
1716  **/
1717 void
1718 gtk_drag_set_icon_default (GdkDragContext    *context)
1719 {
1720   g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
1721   g_return_if_fail (context->is_source);
1722
1723   gtk_drag_set_icon_stock (context, GTK_STOCK_DND, -2, -2);
1724 }
1725
1726 static void
1727 gtk_drag_source_info_destroy (GtkDragSourceInfo *info)
1728 {
1729   if (info->icon_pixbuf)
1730     g_object_unref (info->icon_pixbuf);
1731
1732   g_signal_emit_by_name (info->widget, "drag-end",
1733                          info->context);
1734
1735   if (info->source_widget)
1736     g_object_unref (info->source_widget);
1737
1738   if (info->widget)
1739     g_object_unref (info->widget);
1740
1741   gtk_target_list_unref (info->target_list);
1742
1743   gtk_drag_clear_source_info (info->context);
1744   g_object_unref (info->context);
1745
1746   g_free (info);
1747 }
1748
1749 static gboolean
1750 drag_drop_finished_idle_cb (gpointer data)
1751 {
1752   gtk_drag_source_info_destroy (data);
1753   return FALSE;
1754 }
1755
1756 static void
1757 gtk_drag_drop_finished (GtkDragSourceInfo *info)
1758 {
1759   if (info->success && info->delete)
1760     g_signal_emit_by_name (info->source_widget, "drag-data-delete",
1761                            info->context);
1762
1763   /* Workaround for the fact that the NS API blocks until the drag is
1764    * over. This way the context is still valid when returning from
1765    * drag_begin, even if it will still be quite useless. See bug #501588.
1766   */
1767   g_idle_add (drag_drop_finished_idle_cb, info);
1768 }
1769
1770 /*************************************************************
1771  * _gtk_drag_source_handle_event:
1772  *     Called from widget event handling code on Drag events
1773  *     for drag sources.
1774  *
1775  *   arguments:
1776  *     toplevel: Toplevel widget that received the event
1777  *     event:
1778  *   results:
1779  *************************************************************/
1780
1781 void
1782 _gtk_drag_source_handle_event (GtkWidget *widget,
1783                                GdkEvent  *event)
1784 {
1785   GtkDragSourceInfo *info;
1786   GdkDragContext *context;
1787
1788   g_return_if_fail (widget != NULL);
1789   g_return_if_fail (event != NULL);
1790
1791   context = event->dnd.context;
1792   info = gtk_drag_get_source_info (context, FALSE);
1793   if (!info)
1794     return;
1795
1796   switch (event->type)
1797     {
1798     case GDK_DROP_FINISHED:
1799       gtk_drag_drop_finished (info);
1800       break;
1801     default:
1802       g_assert_not_reached ();
1803     }
1804 }
1805
1806
1807 gboolean
1808 gtk_drag_check_threshold (GtkWidget *widget,
1809                           gint       start_x,
1810                           gint       start_y,
1811                           gint       current_x,
1812                           gint       current_y)
1813 {
1814   gint drag_threshold;
1815
1816   g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
1817
1818   g_object_get (gtk_widget_get_settings (widget),
1819                 "gtk-dnd-drag-threshold", &drag_threshold,
1820                 NULL);
1821
1822   return (ABS (current_x - start_x) > drag_threshold ||
1823           ABS (current_y - start_y) > drag_threshold);
1824 }