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

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 1995-1997 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 "gtkintl.h"
  28 #include "gtkpaned.h"
  29 #include "gtkbindings.h"
  30 #include "gtksignal.h"
  31 #include "gdk/gdkkeysyms.h"
  32 #include "gtkwindow.h"
  33 #include "gtkmain.h"
  34 #include "gtkmarshalers.h"
  35
  36 enum {
  37   PROP_0,
  38   PROP_POSITION,
  39   PROP_POSITION_SET
  40 };
  41
  42 enum {
  43   CYCLE_CHILD_FOCUS,
  44   TOGGLE_HANDLE_FOCUS,
  45   MOVE_HANDLE,
  46   CYCLE_HANDLE_FOCUS,
  47   ACCEPT_POSITION,
  48   CANCEL_POSITION,
  49   LAST_SIGNAL
  50 };
  51
  52 static void     gtk_paned_class_init            (GtkPanedClass    *klass);
  53 static void     gtk_paned_init                  (GtkPaned         *paned);
  54 static void     gtk_paned_set_property          (GObject          *object,
  55                                                  guint             prop_id,
  56                                                  const GValue     *value,
  57                                                  GParamSpec       *pspec);
  58 static void     gtk_paned_get_property          (GObject          *object,
  59                                                  guint             prop_id,
  60                                                  GValue           *value,
  61                                                  GParamSpec       *pspec);
  62 static void     gtk_paned_finalize              (GObject          *object);
  63 static void     gtk_paned_realize               (GtkWidget        *widget);
  64 static void     gtk_paned_unrealize             (GtkWidget        *widget);
  65 static void     gtk_paned_map                   (GtkWidget        *widget);
  66 static void     gtk_paned_unmap                 (GtkWidget        *widget);
  67 static gboolean gtk_paned_expose                (GtkWidget        *widget,
  68                                                  GdkEventExpose   *event);
  69 static gboolean gtk_paned_enter                 (GtkWidget        *widget,
  70                                                  GdkEventCrossing *event);
  71 static gboolean gtk_paned_leave                 (GtkWidget        *widget,
  72                                                  GdkEventCrossing *event);
  73 static gboolean gtk_paned_button_press          (GtkWidget        *widget,
  74                                                  GdkEventButton   *event);
  75 static gboolean gtk_paned_button_release        (GtkWidget        *widget,
  76                                                  GdkEventButton   *event);
  77 static gboolean gtk_paned_motion                (GtkWidget        *widget,
  78                                                  GdkEventMotion   *event);
  79 static gboolean gtk_paned_focus                 (GtkWidget        *widget,
  80                                                  GtkDirectionType  direction);
  81 static void     gtk_paned_add                   (GtkContainer     *container,
  82                                                  GtkWidget        *widget);
  83 static void     gtk_paned_remove                (GtkContainer     *container,
  84                                                  GtkWidget        *widget);
  85 static void     gtk_paned_forall                (GtkContainer     *container,
  86                                                  gboolean          include_internals,
  87                                                  GtkCallback       callback,
  88                                                  gpointer          callback_data);
  89 static void     gtk_paned_set_focus_child       (GtkContainer     *container,
  90                                                  GtkWidget        *child);
  91 static void     gtk_paned_set_saved_focus       (GtkPaned         *paned,
  92                                                  GtkWidget        *widget);
  93 static void     gtk_paned_set_first_paned       (GtkPaned         *paned,
  94                                                  GtkPaned         *first_paned);
  95 static void     gtk_paned_set_last_child1_focus (GtkPaned         *paned,
  96                                                  GtkWidget        *widget);
  97 static void     gtk_paned_set_last_child2_focus (GtkPaned         *paned,
  98                                                  GtkWidget        *widget);
  99 static gboolean gtk_paned_cycle_child_focus     (GtkPaned         *paned,
 100                                                  gboolean          reverse);
 101 static gboolean gtk_paned_cycle_handle_focus    (GtkPaned         *paned,
 102                                                  gboolean          reverse);
 103 static gboolean gtk_paned_move_handle           (GtkPaned         *paned,
 104                                                  GtkScrollType     scroll);
 105 static gboolean gtk_paned_accept_position       (GtkPaned         *paned);
 106 static gboolean gtk_paned_cancel_position       (GtkPaned         *paned);
 107 static gboolean gtk_paned_toggle_handle_focus   (GtkPaned         *paned);
 108
 109 static GType    gtk_paned_child_type             (GtkContainer     *container);
 110
 111 static GtkContainerClass *parent_class = NULL;
 112
 113 struct _GtkPanedPrivate
 114 {
 115   GtkWidget *saved_focus;
 116   GtkPaned *first_paned;
 117 };
 118
 119 GType
 120 gtk_paned_get_type (void)
 121 {
 122   static GType paned_type = 0;
 123
 124   if (!paned_type)
 125     {
 126       static const GTypeInfo paned_info =
 127       {
 128         sizeof (GtkPanedClass),
 129         NULL,           /* base_init */
 130         NULL,           /* base_finalize */
 131         (GClassInitFunc) gtk_paned_class_init,
 132         NULL,           /* class_finalize */
 133         NULL,           /* class_data */
 134         sizeof (GtkPaned),
 135         0,              /* n_preallocs */
 136         (GInstanceInitFunc) gtk_paned_init,
 137         NULL,           /* value_table */
 138       };
 139
 140       paned_type = g_type_register_static (GTK_TYPE_CONTAINER, "GtkPaned",
 141                                            &paned_info, G_TYPE_FLAG_ABSTRACT);
 142     }
 143
 144   return paned_type;
 145 }
 146
 147 static guint signals[LAST_SIGNAL] = { 0 };
 148
 149 static void
 150 add_tab_bindings (GtkBindingSet    *binding_set,
 151                   GdkModifierType   modifiers)
 152 {
 153   gtk_binding_entry_add_signal (binding_set, GDK_Tab, modifiers,
 154                                 "toggle_handle_focus", 0);
 155   gtk_binding_entry_add_signal (binding_set, GDK_KP_Tab, modifiers,
 156                                 "toggle_handle_focus", 0);
 157 }
 158
 159 static void
 160 add_move_binding (GtkBindingSet   *binding_set,
 161                   guint            keyval,
 162                   GdkModifierType  mask,
 163                   GtkScrollType    scroll)
 164 {
 165   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 166                                 "move_handle", 1,
 167                                 GTK_TYPE_SCROLL_TYPE, scroll);
 168 }
 169
 170 static void
 171 gtk_paned_class_init (GtkPanedClass *class)
 172 {
 173   GObjectClass *object_class;
 174   GtkWidgetClass *widget_class;
 175   GtkContainerClass *container_class;
 176   GtkPanedClass *paned_class;
 177   GtkBindingSet *binding_set;
 178
 179   object_class = (GObjectClass *) class;
 180   widget_class = (GtkWidgetClass *) class;
 181   container_class = (GtkContainerClass *) class;
 182   paned_class = (GtkPanedClass *) class;
 183
 184   parent_class = g_type_class_peek_parent (class);
 185
 186   object_class->set_property = gtk_paned_set_property;
 187   object_class->get_property = gtk_paned_get_property;
 188   object_class->finalize = gtk_paned_finalize;
 189
 190   widget_class->realize = gtk_paned_realize;
 191   widget_class->unrealize = gtk_paned_unrealize;
 192   widget_class->map = gtk_paned_map;
 193   widget_class->unmap = gtk_paned_unmap;
 194   widget_class->expose_event = gtk_paned_expose;
 195   widget_class->focus = gtk_paned_focus;
 196   widget_class->enter_notify_event = gtk_paned_enter;
 197   widget_class->leave_notify_event = gtk_paned_leave;
 198   widget_class->button_press_event = gtk_paned_button_press;
 199   widget_class->button_release_event = gtk_paned_button_release;
 200   widget_class->motion_notify_event = gtk_paned_motion;
 201
 202   container_class->add = gtk_paned_add;
 203   container_class->remove = gtk_paned_remove;
 204   container_class->forall = gtk_paned_forall;
 205   container_class->child_type = gtk_paned_child_type;
 206   container_class->set_focus_child = gtk_paned_set_focus_child;
 207
 208   paned_class->cycle_child_focus = gtk_paned_cycle_child_focus;
 209   paned_class->toggle_handle_focus = gtk_paned_toggle_handle_focus;
 210   paned_class->move_handle = gtk_paned_move_handle;
 211   paned_class->cycle_handle_focus = gtk_paned_cycle_handle_focus;
 212   paned_class->accept_position = gtk_paned_accept_position;
 213   paned_class->cancel_position = gtk_paned_cancel_position;
 214
 215   g_object_class_install_property (object_class,
 216                                    PROP_POSITION,
 217                                    g_param_spec_int ("position",
 218                                                      _("Position"),
 219                                                      _("Position of paned separator in pixels (0 means all the way to the left/top)"),
 220                                                      0,
 221                                                      G_MAXINT,
 222                                                      0,
 223                                                      G_PARAM_READABLE | G_PARAM_WRITABLE));
 224   g_object_class_install_property (object_class,
 225                                    PROP_POSITION_SET,
 226                                    g_param_spec_boolean ("position_set",
 227                                                          _("Position Set"),
 228                                                          _("TRUE if the Position property should be used"),
 229                                                          FALSE,
 230                                                          G_PARAM_READABLE | G_PARAM_WRITABLE));
 231
 232   gtk_widget_class_install_style_property (widget_class,
 233                                            g_param_spec_int ("handle_size",
 234                                                              _("Handle Size"),
 235                                                              _("Width of handle"),
 236                                                              0,
 237                                                              G_MAXINT,
 238                                                              5,
 239                                                              G_PARAM_READABLE));
 240
 241   signals [CYCLE_HANDLE_FOCUS] =
 242     g_signal_new ("cycle_child_focus",
 243                   G_TYPE_FROM_CLASS (object_class),
 244                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 245                   G_STRUCT_OFFSET (GtkPanedClass, cycle_child_focus),
 246                   NULL, NULL,
 247                   _gtk_marshal_BOOLEAN__BOOLEAN,
 248                   G_TYPE_BOOLEAN, 1,
 249                   G_TYPE_BOOLEAN);
 250
 251   signals [TOGGLE_HANDLE_FOCUS] =
 252     g_signal_new ("toggle_handle_focus",
 253                   G_TYPE_FROM_CLASS (object_class),
 254                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 255                   G_STRUCT_OFFSET (GtkPanedClass, toggle_handle_focus),
 256                   NULL, NULL,
 257                   _gtk_marshal_BOOLEAN__VOID,
 258                   G_TYPE_BOOLEAN, 0);
 259
 260   signals[MOVE_HANDLE] =
 261     g_signal_new ("move_handle",
 262                   G_TYPE_FROM_CLASS (object_class),
 263                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 264                   G_STRUCT_OFFSET (GtkPanedClass, move_handle),
 265                   NULL, NULL,
 266                   _gtk_marshal_BOOLEAN__ENUM,
 267                   G_TYPE_BOOLEAN, 1,
 268                   GTK_TYPE_SCROLL_TYPE);
 269
 270   signals [CYCLE_HANDLE_FOCUS] =
 271     g_signal_new ("cycle_handle_focus",
 272                   G_TYPE_FROM_CLASS (object_class),
 273                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 274                   G_STRUCT_OFFSET (GtkPanedClass, cycle_handle_focus),
 275                   NULL, NULL,
 276                   _gtk_marshal_BOOLEAN__BOOLEAN,
 277                   G_TYPE_BOOLEAN, 1,
 278                   G_TYPE_BOOLEAN);
 279
 280   signals [ACCEPT_POSITION] =
 281     g_signal_new ("accept_position",
 282                   G_TYPE_FROM_CLASS (object_class),
 283                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 284                   G_STRUCT_OFFSET (GtkPanedClass, accept_position),
 285                   NULL, NULL,
 286                   _gtk_marshal_BOOLEAN__VOID,
 287                   G_TYPE_BOOLEAN, 0);
 288
 289   signals [CANCEL_POSITION] =
 290     g_signal_new ("cancel_position",
 291                   G_TYPE_FROM_CLASS (object_class),
 292                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 293                   G_STRUCT_OFFSET (GtkPanedClass, cancel_position),
 294                   NULL, NULL,
 295                   _gtk_marshal_BOOLEAN__VOID,
 296                   G_TYPE_BOOLEAN, 0);
 297
 298   binding_set = gtk_binding_set_by_class (class);
 299
 300   /* F6 and friends */
 301   gtk_binding_entry_add_signal (binding_set,
 302                                 GDK_F6, 0,
 303                                 "cycle_child_focus", 1,
 304                                 G_TYPE_BOOLEAN, FALSE);
 305   gtk_binding_entry_add_signal (binding_set,
 306                                 GDK_F6, GDK_SHIFT_MASK,
 307                                 "cycle_child_focus", 1,
 308                                 G_TYPE_BOOLEAN, TRUE);
 309
 310   /* F8 and friends */
 311   gtk_binding_entry_add_signal (binding_set,
 312                                 GDK_F8, 0,
 313                                 "cycle_handle_focus", 1,
 314                                 G_TYPE_BOOLEAN, FALSE);
 315
 316   gtk_binding_entry_add_signal (binding_set,
 317                                 GDK_F8, GDK_SHIFT_MASK,
 318                                 "cycle_handle_focus", 1,
 319                                 G_TYPE_BOOLEAN, TRUE);
 320
 321   add_tab_bindings (binding_set, 0);
 322   add_tab_bindings (binding_set, GDK_CONTROL_MASK);
 323   add_tab_bindings (binding_set, GDK_SHIFT_MASK);
 324   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK);
 325
 326   /* accept and cancel positions */
 327   gtk_binding_entry_add_signal (binding_set,
 328                                 GDK_Escape, 0,
 329                                 "cancel_position", 0);
 330
 331   gtk_binding_entry_add_signal (binding_set,
 332                                 GDK_Return, 0,
 333                                 "accept_position", 0);
 334   gtk_binding_entry_add_signal (binding_set,
 335                                 GDK_KP_Enter, 0,
 336                                 "accept_position", 0);
 337   gtk_binding_entry_add_signal (binding_set,
 338                                 GDK_space, 0,
 339                                 "accept_position", 0);
 340   gtk_binding_entry_add_signal (binding_set,
 341                                 GDK_KP_Space, 0,
 342                                 "accept_position", 0);
 343
 344   /* move handle */
 345   add_move_binding (binding_set, GDK_Left, 0, GTK_SCROLL_STEP_LEFT);
 346   add_move_binding (binding_set, GDK_KP_Left, 0, GTK_SCROLL_STEP_LEFT);
 347   add_move_binding (binding_set, GDK_Left, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_LEFT);
 348   add_move_binding (binding_set, GDK_KP_Left, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_LEFT);
 349
 350   add_move_binding (binding_set, GDK_Right, 0, GTK_SCROLL_STEP_RIGHT);
 351   add_move_binding (binding_set, GDK_Right, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_RIGHT);
 352   add_move_binding (binding_set, GDK_KP_Right, 0, GTK_SCROLL_STEP_RIGHT);
 353   add_move_binding (binding_set, GDK_KP_Right, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_RIGHT);
 354
 355   add_move_binding (binding_set, GDK_Up, 0, GTK_SCROLL_STEP_UP);
 356   add_move_binding (binding_set, GDK_Up, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_UP);
 357   add_move_binding (binding_set, GDK_KP_Up, 0, GTK_SCROLL_STEP_UP);
 358   add_move_binding (binding_set, GDK_KP_Up, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_UP);
 359   add_move_binding (binding_set, GDK_Page_Up, 0, GTK_SCROLL_PAGE_UP);
 360   add_move_binding (binding_set, GDK_KP_Page_Up, 0, GTK_SCROLL_PAGE_UP);
 361
 362   add_move_binding (binding_set, GDK_Down, 0, GTK_SCROLL_STEP_DOWN);
 363   add_move_binding (binding_set, GDK_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_DOWN);
 364   add_move_binding (binding_set, GDK_KP_Down, 0, GTK_SCROLL_STEP_DOWN);
 365   add_move_binding (binding_set, GDK_KP_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_DOWN);
 366   add_move_binding (binding_set, GDK_Page_Down, 0, GTK_SCROLL_PAGE_RIGHT);
 367   add_move_binding (binding_set, GDK_KP_Page_Down, 0, GTK_SCROLL_PAGE_RIGHT);
 368
 369   add_move_binding (binding_set, GDK_Home, 0, GTK_SCROLL_START);
 370   add_move_binding (binding_set, GDK_KP_Home, 0, GTK_SCROLL_START);
 371   add_move_binding (binding_set, GDK_End, 0, GTK_SCROLL_END);
 372   add_move_binding (binding_set, GDK_KP_End, 0, GTK_SCROLL_END);
 373 }
 374
 375 static GType
 376 gtk_paned_child_type (GtkContainer *container)
 377 {
 378   if (!GTK_PANED (container)->child1 || !GTK_PANED (container)->child2)
 379     return GTK_TYPE_WIDGET;
 380   else
 381     return G_TYPE_NONE;
 382 }
 383
 384 static void
 385 gtk_paned_init (GtkPaned *paned)
 386 {
 387   GTK_WIDGET_SET_FLAGS (paned, GTK_NO_WINDOW | GTK_CAN_FOCUS);
 388
 389   paned->child1 = NULL;
 390   paned->child2 = NULL;
 391   paned->handle = NULL;
 392   paned->xor_gc = NULL;
 393   paned->cursor_type = GDK_CROSS;
 394
 395   paned->handle_pos.width = 5;
 396   paned->handle_pos.height = 5;
 397   paned->position_set = FALSE;
 398   paned->last_allocation = -1;
 399   paned->in_drag = FALSE;
 400
 401   paned->priv = g_new0 (GtkPanedPrivate, 1);
 402   paned->last_child1_focus = NULL;
 403   paned->last_child2_focus = NULL;
 404   paned->in_recursion = FALSE;
 405   paned->handle_prelit = FALSE;
 406   paned->original_position = -1;
 407
 408   paned->handle_pos.x = -1;
 409   paned->handle_pos.y = -1;
 410
 411   paned->drag_pos = -1;
 412 }
 413
 414 static void
 415 gtk_paned_set_property (GObject        *object,
 416                         guint           prop_id,
 417                         const GValue   *value,
 418                         GParamSpec     *pspec)
 419 {
 420   GtkPaned *paned = GTK_PANED (object);
 421
 422   switch (prop_id)
 423     {
 424     case PROP_POSITION:
 425       gtk_paned_set_position (paned, g_value_get_int (value));
 426       break;
 427     case PROP_POSITION_SET:
 428       paned->position_set = g_value_get_boolean (value);
 429       gtk_widget_queue_resize (GTK_WIDGET (paned));
 430       break;
 431     default:
 432       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 433       break;
 434     }
 435 }
 436
 437 static void
 438 gtk_paned_get_property (GObject        *object,
 439                         guint           prop_id,
 440                         GValue         *value,
 441                         GParamSpec     *pspec)
 442 {
 443   GtkPaned *paned = GTK_PANED (object);
 444
 445   switch (prop_id)
 446     {
 447     case PROP_POSITION:
 448       g_value_set_int (value, paned->child1_size);
 449       break;
 450     case PROP_POSITION_SET:
 451       g_value_set_boolean (value, paned->position_set);
 452       break;
 453     default:
 454       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 455       break;
 456     }
 457 }
 458
 459 static void
 460 gtk_paned_finalize (GObject *object)
 461 {
 462   GtkPaned *paned = GTK_PANED (object);
 463
 464   gtk_paned_set_saved_focus (paned, NULL);
 465   gtk_paned_set_first_paned (paned, NULL);
 466
 467   g_free (paned->priv);
 468
 469   G_OBJECT_CLASS (parent_class)->finalize (object);
 470 }
 471
 472 static void
 473 gtk_paned_realize (GtkWidget *widget)
 474 {
 475   GtkPaned *paned;
 476   GdkWindowAttr attributes;
 477   gint attributes_mask;
 478
 479   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 480   paned = GTK_PANED (widget);
 481
 482   widget->window = gtk_widget_get_parent_window (widget);
 483   g_object_ref (widget->window);
 484
 485   attributes.window_type = GDK_WINDOW_CHILD;
 486   attributes.wclass = GDK_INPUT_ONLY;
 487   attributes.x = paned->handle_pos.x;
 488   attributes.y = paned->handle_pos.y;
 489   attributes.width = paned->handle_pos.width;
 490   attributes.height = paned->handle_pos.height;
 491   attributes.cursor = gdk_cursor_new_for_display (gtk_widget_get_display (widget),
 492                                                   paned->cursor_type);
 493   attributes.event_mask = gtk_widget_get_events (widget);
 494   attributes.event_mask |= (GDK_BUTTON_PRESS_MASK |
 495                             GDK_BUTTON_RELEASE_MASK |
 496                             GDK_ENTER_NOTIFY_MASK |
 497                             GDK_LEAVE_NOTIFY_MASK |
 498                             GDK_POINTER_MOTION_MASK |
 499                             GDK_POINTER_MOTION_HINT_MASK);
 500   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_CURSOR;
 501
 502   paned->handle = gdk_window_new (widget->window,
 503                                   &attributes, attributes_mask);
 504   gdk_window_set_user_data (paned->handle, paned);
 505   gdk_cursor_unref (attributes.cursor);
 506
 507   widget->style = gtk_style_attach (widget->style, widget->window);
 508
 509   if (paned->child1 && GTK_WIDGET_VISIBLE (paned->child1) &&
 510       paned->child2 && GTK_WIDGET_VISIBLE (paned->child2))
 511     gdk_window_show (paned->handle);
 512 }
 513
 514 static void
 515 gtk_paned_unrealize (GtkWidget *widget)
 516 {
 517   GtkPaned *paned = GTK_PANED (widget);
 518
 519   if (paned->xor_gc)
 520     {
 521       g_object_unref (paned->xor_gc);
 522       paned->xor_gc = NULL;
 523     }
 524
 525   if (paned->handle)
 526     {
 527       gdk_window_set_user_data (paned->handle, NULL);
 528       gdk_window_destroy (paned->handle);
 529       paned->handle = NULL;
 530     }
 531
 532   gtk_paned_set_last_child1_focus (paned, NULL);
 533   gtk_paned_set_last_child2_focus (paned, NULL);
 534   gtk_paned_set_saved_focus (paned, NULL);
 535   gtk_paned_set_first_paned (paned, NULL);
 536
 537   if (GTK_WIDGET_CLASS (parent_class)->unrealize)
 538     (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 539 }
 540
 541 static void
 542 gtk_paned_map (GtkWidget *widget)
 543 {
 544   GtkPaned *paned = GTK_PANED (widget);
 545
 546   gdk_window_show (paned->handle);
 547
 548   GTK_WIDGET_CLASS (parent_class)->map (widget);
 549 }
 550
 551 static void
 552 gtk_paned_unmap (GtkWidget *widget)
 553 {
 554   GtkPaned *paned = GTK_PANED (widget);
 555
 556   gdk_window_hide (paned->handle);
 557
 558   GTK_WIDGET_CLASS (parent_class)->unmap (widget);
 559 }
 560
 561 static gboolean
 562 gtk_paned_expose (GtkWidget      *widget,
 563                   GdkEventExpose *event)
 564 {
 565   GtkPaned *paned = GTK_PANED (widget);
 566
 567   if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_MAPPED (widget) &&
 568       paned->child1 && GTK_WIDGET_VISIBLE (paned->child1) &&
 569       paned->child2 && GTK_WIDGET_VISIBLE (paned->child2))
 570     {
 571       GdkRegion *region;
 572
 573       region = gdk_region_rectangle (&paned->handle_pos);
 574       gdk_region_intersect (region, event->region);
 575
 576       if (!gdk_region_empty (region))
 577         {
 578           GtkStateType state;
 579           GdkRectangle clip;
 580
 581           gdk_region_get_clipbox (region, &clip);
 582
 583           if (gtk_widget_is_focus (widget))
 584             state = GTK_STATE_SELECTED;
 585           else if (paned->handle_prelit)
 586             state = GTK_STATE_PRELIGHT;
 587           else
 588             state = GTK_WIDGET_STATE (widget);
 589
 590           gtk_paint_handle (widget->style, widget->window,
 591                             state, GTK_SHADOW_NONE,
 592                             &clip, widget, "paned",
 593                             paned->handle_pos.x, paned->handle_pos.y,
 594                             paned->handle_pos.width, paned->handle_pos.height,
 595                             paned->orientation);
 596         }
 597
 598       gdk_region_destroy (region);
 599     }
 600
 601   /* Chain up to draw children */
 602   GTK_WIDGET_CLASS (parent_class)->expose_event (widget, event);
 603
 604   return FALSE;
 605 }
 606
 607 static void
 608 update_drag (GtkPaned *paned)
 609 {
 610   gint pos;
 611   gint handle_size;
 612   gint size;
 613
 614   if (paned->orientation == GTK_ORIENTATION_HORIZONTAL)
 615     gtk_widget_get_pointer (GTK_WIDGET (paned), NULL, &pos);
 616   else
 617     gtk_widget_get_pointer (GTK_WIDGET (paned), &pos, NULL);
 618
 619   gtk_widget_style_get (GTK_WIDGET (paned), "handle_size", &handle_size, NULL);
 620
 621   size = pos - GTK_CONTAINER (paned)->border_width - paned->drag_pos;
 622   size = CLAMP (size, paned->min_position, paned->max_position);
 623
 624   if (size != paned->child1_size)
 625     gtk_paned_set_position (paned, size);
 626 }
 627
 628 static gboolean
 629 gtk_paned_enter (GtkWidget        *widget,
 630                  GdkEventCrossing *event)
 631 {
 632   GtkPaned *paned = GTK_PANED (widget);
 633
 634   if (paned->in_drag)
 635     update_drag (paned);
 636   else
 637     {
 638       paned->handle_prelit = TRUE;
 639       gtk_widget_queue_draw_area (widget,
 640                                   paned->handle_pos.x,
 641                                   paned->handle_pos.y,
 642                                   paned->handle_pos.width,
 643                                   paned->handle_pos.height);
 644     }
 645
 646   return TRUE;
 647 }
 648
 649 static gboolean
 650 gtk_paned_leave (GtkWidget        *widget,
 651                  GdkEventCrossing *event)
 652 {
 653   GtkPaned *paned = GTK_PANED (widget);
 654
 655   if (paned->in_drag)
 656     update_drag (paned);
 657   else
 658     {
 659       paned->handle_prelit = FALSE;
 660       gtk_widget_queue_draw_area (widget,
 661                                   paned->handle_pos.x,
 662                                   paned->handle_pos.y,
 663                                   paned->handle_pos.width,
 664                                   paned->handle_pos.height);
 665     }
 666
 667   return TRUE;
 668 }
 669
 670 static gboolean
 671 gtk_paned_focus (GtkWidget        *widget,
 672                  GtkDirectionType  direction)
 673
 674 {
 675   gboolean retval;
 676
 677   /* This is a hack, but how can this be done without
 678    * excessive cut-and-paste from gtkcontainer.c?
 679    */
 680
 681   GTK_WIDGET_UNSET_FLAGS (widget, GTK_CAN_FOCUS);
 682   retval = (* GTK_WIDGET_CLASS (parent_class)->focus) (widget, direction);
 683   GTK_WIDGET_SET_FLAGS (widget, GTK_CAN_FOCUS);
 684
 685   return retval;
 686 }
 687
 688 static gboolean
 689 gtk_paned_button_press (GtkWidget      *widget,
 690                         GdkEventButton *event)
 691 {
 692   GtkPaned *paned = GTK_PANED (widget);
 693
 694   if (!paned->in_drag &&
 695       (event->window == paned->handle) && (event->button == 1))
 696     {
 697       paned->in_drag = TRUE;
 698
 699       /* We need a server grab here, not gtk_grab_add(), since
 700        * we don't want to pass events on to the widget's children */
 701       gdk_pointer_grab (paned->handle, FALSE,
 702                         GDK_POINTER_MOTION_HINT_MASK
 703                         | GDK_BUTTON1_MOTION_MASK
 704                         | GDK_BUTTON_RELEASE_MASK
 705                         | GDK_ENTER_NOTIFY_MASK
 706                         | GDK_LEAVE_NOTIFY_MASK,
 707                         NULL, NULL,
 708                         event->time);
 709
 710       if (paned->orientation == GTK_ORIENTATION_HORIZONTAL)
 711         paned->drag_pos = event->y;
 712       else
 713         paned->drag_pos = event->x;
 714
 715       return TRUE;
 716     }
 717
 718   return FALSE;
 719 }
 720
 721 static gboolean
 722 gtk_paned_button_release (GtkWidget      *widget,
 723                           GdkEventButton *event)
 724 {
 725   GtkPaned *paned = GTK_PANED (widget);
 726
 727   if (paned->in_drag && (event->button == 1))
 728     {
 729       paned->in_drag = FALSE;
 730       paned->drag_pos = -1;
 731       paned->position_set = TRUE;
 732       gdk_display_pointer_ungrab (gtk_widget_get_display (widget),
 733                                   event->time);
 734       return TRUE;
 735     }
 736
 737   return FALSE;
 738 }
 739
 740 static gboolean
 741 gtk_paned_motion (GtkWidget      *widget,
 742                   GdkEventMotion *event)
 743 {
 744   GtkPaned *paned = GTK_PANED (widget);
 745
 746   if (paned->in_drag)
 747     {
 748       update_drag (paned);
 749       return TRUE;
 750     }
 751
 752   return FALSE;
 753 }
 754
 755 void
 756 gtk_paned_add1 (GtkPaned  *paned,
 757                 GtkWidget *widget)
 758 {
 759   gtk_paned_pack1 (paned, widget, FALSE, TRUE);
 760 }
 761
 762 void
 763 gtk_paned_add2 (GtkPaned  *paned,
 764                 GtkWidget *widget)
 765 {
 766   gtk_paned_pack2 (paned, widget, TRUE, TRUE);
 767 }
 768
 769 void
 770 gtk_paned_pack1 (GtkPaned  *paned,
 771                  GtkWidget *child,
 772                  gboolean   resize,
 773                  gboolean   shrink)
 774 {
 775   g_return_if_fail (GTK_IS_PANED (paned));
 776   g_return_if_fail (GTK_IS_WIDGET (child));
 777
 778   if (!paned->child1)
 779     {
 780       paned->child1 = child;
 781       paned->child1_resize = resize;
 782       paned->child1_shrink = shrink;
 783
 784       gtk_widget_set_parent (child, GTK_WIDGET (paned));
 785     }
 786 }
 787
 788 void
 789 gtk_paned_pack2 (GtkPaned  *paned,
 790                  GtkWidget *child,
 791                  gboolean   resize,
 792                  gboolean   shrink)
 793 {
 794   g_return_if_fail (GTK_IS_PANED (paned));
 795   g_return_if_fail (GTK_IS_WIDGET (child));
 796
 797   if (!paned->child2)
 798     {
 799       paned->child2 = child;
 800       paned->child2_resize = resize;
 801       paned->child2_shrink = shrink;
 802
 803       gtk_widget_set_parent (child, GTK_WIDGET (paned));
 804     }
 805 }
 806
 807
 808 static void
 809 gtk_paned_add (GtkContainer *container,
 810                GtkWidget    *widget)
 811 {
 812   GtkPaned *paned;
 813
 814   g_return_if_fail (GTK_IS_PANED (container));
 815
 816   paned = GTK_PANED (container);
 817
 818   if (!paned->child1)
 819     gtk_paned_add1 (paned, widget);
 820   else if (!paned->child2)
 821     gtk_paned_add2 (paned, widget);
 822 }
 823
 824 static void
 825 gtk_paned_remove (GtkContainer *container,
 826                   GtkWidget    *widget)
 827 {
 828   GtkPaned *paned;
 829   gboolean was_visible;
 830
 831   paned = GTK_PANED (container);
 832   was_visible = GTK_WIDGET_VISIBLE (widget);
 833
 834   if (paned->child1 == widget)
 835     {
 836       gtk_widget_unparent (widget);
 837
 838       paned->child1 = NULL;
 839
 840       if (was_visible && GTK_WIDGET_VISIBLE (container))
 841         gtk_widget_queue_resize (GTK_WIDGET (container));
 842     }
 843   else if (paned->child2 == widget)
 844     {
 845       gtk_widget_unparent (widget);
 846
 847       paned->child2 = NULL;
 848
 849       if (was_visible && GTK_WIDGET_VISIBLE (container))
 850         gtk_widget_queue_resize (GTK_WIDGET (container));
 851     }
 852 }
 853
 854 static void
 855 gtk_paned_forall (GtkContainer *container,
 856                   gboolean      include_internals,
 857                   GtkCallback   callback,
 858                   gpointer      callback_data)
 859 {
 860   GtkPaned *paned;
 861
 862   g_return_if_fail (callback != NULL);
 863
 864   paned = GTK_PANED (container);
 865
 866   if (paned->child1)
 867     (*callback) (paned->child1, callback_data);
 868   if (paned->child2)
 869     (*callback) (paned->child2, callback_data);
 870 }
 871
 872 /**
 873  * gtk_paned_get_position:
 874  * @paned: a #GtkPaned widget
 875  *
 876  * Obtains the position of the divider between the two panes.
 877  *
 878  * Return value: position of the divider
 879  **/
 880 gint
 881 gtk_paned_get_position (GtkPaned  *paned)
 882 {
 883   g_return_val_if_fail (GTK_IS_PANED (paned), 0);
 884
 885   return paned->child1_size;
 886 }
 887
 888 /**
 889  * gtk_paned_set_position:
 890  * @paned: a #GtkPaned widget
 891  * @position: pixel position of divider, a negative value means that the position
 892  *            is unset.
 893  *
 894  * Sets the position of the divider between the two panes.
 895  **/
 896 void
 897 gtk_paned_set_position (GtkPaned *paned,
 898                         gint      position)
 899 {
 900   GObject *object;
 901
 902   g_return_if_fail (GTK_IS_PANED (paned));
 903
 904   object = G_OBJECT (paned);
 905
 906   if (position >= 0)
 907     {
 908       /* We don't clamp here - the assumption is that
 909        * if the total allocation changes at the same time
 910        * as the position, the position set is with reference
 911        * to the new total size. If only the position changes,
 912        * then clamping will occur in gtk_paned_compute_position()
 913        */
 914
 915       paned->child1_size = position;
 916       paned->position_set = TRUE;
 917     }
 918   else
 919     {
 920       paned->position_set = FALSE;
 921     }
 922
 923   g_object_freeze_notify (object);
 924   g_object_notify (object, "position");
 925   g_object_notify (object, "position_set");
 926   g_object_thaw_notify (object);
 927
 928   gtk_widget_queue_resize (GTK_WIDGET (paned));
 929 }
 930
 931 void
 932 gtk_paned_compute_position (GtkPaned *paned,
 933                             gint      allocation,
 934                             gint      child1_req,
 935                             gint      child2_req)
 936 {
 937   gint old_position;
 938
 939   g_return_if_fail (GTK_IS_PANED (paned));
 940
 941   old_position = paned->child1_size;
 942
 943   paned->min_position = paned->child1_shrink ? 0 : child1_req;
 944
 945   paned->max_position = allocation;
 946   if (!paned->child2_shrink)
 947     paned->max_position = MAX (1, paned->max_position - child2_req);
 948
 949   if (!paned->position_set)
 950     {
 951       if (paned->child1_resize && !paned->child2_resize)
 952         paned->child1_size = MAX (0, allocation - child2_req);
 953       else if (!paned->child1_resize && paned->child2_resize)
 954         paned->child1_size = child1_req;
 955       else if (child1_req + child2_req != 0)
 956         paned->child1_size = allocation * ((gdouble)child1_req / (child1_req + child2_req));
 957       else
 958         paned->child1_size = allocation * 0.5;
 959     }
 960   else
 961     {
 962       /* If the position was set before the initial allocation.
 963        * (paned->last_allocation <= 0) just clamp it and leave it.
 964        */
 965       if (paned->last_allocation > 0)
 966         {
 967           if (paned->child1_resize && !paned->child2_resize)
 968             paned->child1_size += allocation - paned->last_allocation;
 969           else if (!(!paned->child1_resize && paned->child2_resize))
 970             paned->child1_size = allocation * ((gdouble) paned->child1_size / (paned->last_allocation));
 971         }
 972     }
 973
 974   paned->child1_size = CLAMP (paned->child1_size,
 975                               paned->min_position,
 976                               paned->max_position);
 977
 978   gtk_widget_set_child_visible (paned->child1, paned->child1_size != 0);
 979   gtk_widget_set_child_visible (paned->child2, paned->child1_size != allocation);
 980
 981   if (paned->child1_size != old_position)
 982     g_object_notify (G_OBJECT (paned), "position");
 983
 984   paned->last_allocation = allocation;
 985 }
 986
 987 static void
 988 gtk_paned_set_saved_focus (GtkPaned *paned, GtkWidget *widget)
 989 {
 990   if (paned->priv->saved_focus)
 991     g_object_remove_weak_pointer (G_OBJECT (paned->priv->saved_focus),
 992                                   (gpointer *)&(paned->priv->saved_focus));
 993
 994   paned->priv->saved_focus = widget;
 995
 996   if (paned->priv->saved_focus)
 997     g_object_add_weak_pointer (G_OBJECT (paned->priv->saved_focus),
 998                                (gpointer *)&(paned->priv->saved_focus));
 999 }
1000
1001 static void
1002 gtk_paned_set_first_paned (GtkPaned *paned, GtkPaned *first_paned)
1003 {
1004   if (paned->priv->first_paned)
1005     g_object_remove_weak_pointer (G_OBJECT (paned->priv->first_paned),
1006                                   (gpointer *)&(paned->priv->first_paned));
1007
1008   paned->priv->first_paned = first_paned;
1009
1010   if (paned->priv->first_paned)
1011     g_object_add_weak_pointer (G_OBJECT (paned->priv->first_paned),
1012                                (gpointer *)&(paned->priv->first_paned));
1013 }
1014
1015 static void
1016 gtk_paned_set_last_child1_focus (GtkPaned *paned, GtkWidget *widget)
1017 {
1018   if (paned->last_child1_focus)
1019     g_object_remove_weak_pointer (G_OBJECT (paned->last_child1_focus),
1020                                   (gpointer *)&(paned->last_child1_focus));
1021
1022   paned->last_child1_focus = widget;
1023
1024   if (paned->last_child1_focus)
1025     g_object_add_weak_pointer (G_OBJECT (paned->last_child1_focus),
1026                                (gpointer *)&(paned->last_child1_focus));
1027 }
1028
1029 static void
1030 gtk_paned_set_last_child2_focus (GtkPaned *paned, GtkWidget *widget)
1031 {
1032   if (paned->last_child2_focus)
1033     g_object_remove_weak_pointer (G_OBJECT (paned->last_child2_focus),
1034                                   (gpointer *)&(paned->last_child2_focus));
1035
1036   paned->last_child2_focus = widget;
1037
1038   if (paned->last_child2_focus)
1039     g_object_add_weak_pointer (G_OBJECT (paned->last_child2_focus),
1040                                (gpointer *)&(paned->last_child2_focus));
1041 }
1042
1043 static GtkWidget *
1044 paned_get_focus_widget (GtkPaned *paned)
1045 {
1046   GtkWidget *toplevel;
1047
1048   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (paned));
1049   if (GTK_WIDGET_TOPLEVEL (toplevel))
1050     return GTK_WINDOW (toplevel)->focus_widget;
1051
1052   return NULL;
1053 }
1054
1055 static void
1056 gtk_paned_set_focus_child (GtkContainer *container,
1057                            GtkWidget    *focus_child)
1058 {
1059   GtkPaned *paned;
1060
1061   g_return_if_fail (GTK_IS_PANED (container));
1062
1063   paned = GTK_PANED (container);
1064
1065   if (focus_child == NULL)
1066     {
1067       GtkWidget *last_focus;
1068       GtkWidget *w;
1069
1070       last_focus = paned_get_focus_widget (paned);
1071
1072       if (last_focus)
1073         {
1074           /* If there is one or more paned widgets between us and the
1075            * focus widget, we want the topmost of those as last_focus
1076            */
1077           for (w = last_focus; w != GTK_WIDGET (paned); w = w->parent)
1078             if (GTK_IS_PANED (w))
1079               last_focus = w;
1080
1081           if (container->focus_child == paned->child1)
1082             gtk_paned_set_last_child1_focus (paned, last_focus);
1083           else if (container->focus_child == paned->child2)
1084             gtk_paned_set_last_child2_focus (paned, last_focus);
1085         }
1086     }
1087
1088   if (parent_class->set_focus_child)
1089     (* parent_class->set_focus_child) (container, focus_child);
1090 }
1091
1092 static void
1093 gtk_paned_get_cycle_chain (GtkPaned          *paned,
1094                            GtkDirectionType   direction,
1095                            GList            **widgets)
1096 {
1097   GtkContainer *container = GTK_CONTAINER (paned);
1098   GtkWidget *ancestor = NULL;
1099   GList *temp_list = NULL;
1100   GList *list;
1101
1102   if (paned->in_recursion)
1103     return;
1104
1105   g_assert (widgets != NULL);
1106
1107   if (paned->last_child1_focus &&
1108       !gtk_widget_is_ancestor (paned->last_child1_focus, GTK_WIDGET (paned)))
1109     {
1110       gtk_paned_set_last_child1_focus (paned, NULL);
1111     }
1112
1113   if (paned->last_child2_focus &&
1114       !gtk_widget_is_ancestor (paned->last_child2_focus, GTK_WIDGET (paned)))
1115     {
1116       gtk_paned_set_last_child2_focus (paned, NULL);
1117     }
1118
1119   if (GTK_WIDGET (paned)->parent)
1120     ancestor = gtk_widget_get_ancestor (GTK_WIDGET (paned)->parent, GTK_TYPE_PANED);
1121
1122   /* The idea here is that temp_list is a list of widgets we want to cycle
1123    * to. The list is prioritized so that the first element is our first
1124    * choice, the next our second, and so on.
1125    *
1126    * We can't just use g_list_reverse(), because we want to try
1127    * paned->last_child?_focus before paned->child?, both when we
1128    * are going forward and backward.
1129    */
1130   if (direction == GTK_DIR_TAB_FORWARD)
1131     {
1132       if (container->focus_child == paned->child1)
1133         {
1134           temp_list = g_list_append (temp_list, paned->last_child2_focus);
1135           temp_list = g_list_append (temp_list, paned->child2);
1136           temp_list = g_list_append (temp_list, ancestor);
1137         }
1138       else if (container->focus_child == paned->child2)
1139         {
1140           temp_list = g_list_append (temp_list, ancestor);
1141           temp_list = g_list_append (temp_list, paned->last_child1_focus);
1142           temp_list = g_list_append (temp_list, paned->child1);
1143         }
1144       else
1145         {
1146           temp_list = g_list_append (temp_list, paned->last_child1_focus);
1147           temp_list = g_list_append (temp_list, paned->child1);
1148           temp_list = g_list_append (temp_list, paned->last_child2_focus);
1149           temp_list = g_list_append (temp_list, paned->child2);
1150           temp_list = g_list_append (temp_list, ancestor);
1151         }
1152     }
1153   else
1154     {
1155       if (container->focus_child == paned->child1)
1156         {
1157           temp_list = g_list_append (temp_list, ancestor);
1158           temp_list = g_list_append (temp_list, paned->last_child2_focus);
1159           temp_list = g_list_append (temp_list, paned->child2);
1160         }
1161       else if (container->focus_child == paned->child2)
1162         {
1163           temp_list = g_list_append (temp_list, paned->last_child1_focus);
1164           temp_list = g_list_append (temp_list, paned->child1);
1165           temp_list = g_list_append (temp_list, ancestor);
1166         }
1167       else
1168         {
1169           temp_list = g_list_append (temp_list, paned->last_child2_focus);
1170           temp_list = g_list_append (temp_list, paned->child2);
1171           temp_list = g_list_append (temp_list, paned->last_child1_focus);
1172           temp_list = g_list_append (temp_list, paned->child1);
1173           temp_list = g_list_append (temp_list, ancestor);
1174         }
1175     }
1176
1177   /* Walk the list and expand all the paned widgets. */
1178   for (list = temp_list; list != NULL; list = list->next)
1179     {
1180       GtkWidget *widget = list->data;
1181
1182       if (widget)
1183         {
1184           if (GTK_IS_PANED (widget))
1185             {
1186               paned->in_recursion = TRUE;
1187               gtk_paned_get_cycle_chain (GTK_PANED (widget), direction, widgets);
1188               paned->in_recursion = FALSE;
1189             }
1190           else
1191             {
1192               *widgets = g_list_append (*widgets, widget);
1193             }
1194         }
1195     }
1196
1197   g_list_free (temp_list);
1198 }
1199
1200 static gboolean
1201 gtk_paned_cycle_child_focus (GtkPaned *paned,
1202                              gboolean  reversed)
1203 {
1204   GList *cycle_chain = NULL;
1205   GList *list;
1206
1207   GtkDirectionType direction = reversed? GTK_DIR_TAB_BACKWARD : GTK_DIR_TAB_FORWARD;
1208
1209   /* ignore f6 if the handle is focused */
1210   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
1211     return TRUE;
1212
1213   /* we can't just let the event propagate up the hierarchy,
1214    * because the paned will want to cycle focus _unless_ an
1215    * ancestor paned handles the event
1216    */
1217   gtk_paned_get_cycle_chain (paned, direction, &cycle_chain);
1218
1219   for (list = cycle_chain; list != NULL; list = list->next)
1220     if (gtk_widget_child_focus (GTK_WIDGET (list->data), direction))
1221       break;
1222
1223   g_list_free (cycle_chain);
1224
1225   return TRUE;
1226 }
1227
1228 static void
1229 get_child_panes (GtkWidget  *widget,
1230                  GList     **panes)
1231 {
1232   if (GTK_IS_PANED (widget))
1233     {
1234       GtkPaned *paned = GTK_PANED (widget);
1235
1236       get_child_panes (paned->child1, panes);
1237       *panes = g_list_prepend (*panes, widget);
1238       get_child_panes (paned->child2, panes);
1239     }
1240   else if (GTK_IS_CONTAINER (widget))
1241     {
1242       gtk_container_foreach (GTK_CONTAINER (widget),
1243                              (GtkCallback)get_child_panes, panes);
1244     }
1245 }
1246
1247 static GList *
1248 get_all_panes (GtkPaned *paned)
1249 {
1250   GtkPaned *topmost = NULL;
1251   GList *result = NULL;
1252   GtkWidget *w;
1253
1254   for (w = GTK_WIDGET (paned); w != NULL; w = w->parent)
1255     {
1256       if (GTK_IS_PANED (w))
1257         topmost = GTK_PANED (w);
1258     }
1259
1260   g_assert (topmost);
1261
1262   get_child_panes (GTK_WIDGET (topmost), &result);
1263
1264   return g_list_reverse (result);
1265 }
1266
1267 static void
1268 gtk_paned_find_neighbours (GtkPaned  *paned,
1269                            GtkPaned **next,
1270                            GtkPaned **prev)
1271 {
1272   GList *all_panes;
1273   GList *this_link;
1274
1275   all_panes = get_all_panes (paned);
1276   g_assert (all_panes);
1277
1278   this_link = g_list_find (all_panes, paned);
1279
1280   g_assert (this_link);
1281
1282   if (this_link->next)
1283     *next = this_link->next->data;
1284   else
1285     *next = all_panes->data;
1286
1287   if (this_link->prev)
1288     *prev = this_link->prev->data;
1289   else
1290     *prev = g_list_last (all_panes)->data;
1291
1292   g_list_free (all_panes);
1293 }
1294
1295 static gboolean
1296 gtk_paned_move_handle (GtkPaned      *paned,
1297                        GtkScrollType  scroll)
1298 {
1299   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
1300     {
1301       gint old_position;
1302       gint new_position;
1303
1304       enum {
1305         SINGLE_STEP_SIZE = 1,
1306         PAGE_STEP_SIZE   = 75
1307       };
1308
1309       old_position = gtk_paned_get_position (paned);
1310
1311       switch (scroll)
1312         {
1313         case GTK_SCROLL_STEP_LEFT:
1314         case GTK_SCROLL_STEP_UP:
1315         case GTK_SCROLL_STEP_BACKWARD:
1316           new_position = old_position - SINGLE_STEP_SIZE;
1317           break;
1318
1319         case GTK_SCROLL_STEP_RIGHT:
1320         case GTK_SCROLL_STEP_DOWN:
1321         case GTK_SCROLL_STEP_FORWARD:
1322           new_position = old_position + SINGLE_STEP_SIZE;
1323           break;
1324
1325         case GTK_SCROLL_PAGE_LEFT:
1326         case GTK_SCROLL_PAGE_UP:
1327         case GTK_SCROLL_PAGE_BACKWARD:
1328           new_position = old_position - PAGE_STEP_SIZE;
1329           break;
1330
1331         case GTK_SCROLL_PAGE_RIGHT:
1332         case GTK_SCROLL_PAGE_DOWN:
1333         case GTK_SCROLL_PAGE_FORWARD:
1334           new_position = old_position + PAGE_STEP_SIZE;
1335           break;
1336
1337         case GTK_SCROLL_START:
1338           new_position = paned->min_position;
1339           break;
1340
1341         case GTK_SCROLL_END:
1342           new_position = paned->max_position;
1343           break;
1344
1345         default:
1346           new_position = old_position;
1347           break;
1348         }
1349
1350       new_position = CLAMP (new_position, paned->min_position, paned->max_position);
1351
1352       if (old_position != new_position)
1353         gtk_paned_set_position (paned, new_position);
1354
1355       return TRUE;
1356     }
1357
1358   return FALSE;
1359 }
1360
1361 static void
1362 gtk_paned_restore_focus (GtkPaned *paned)
1363 {
1364   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
1365     {
1366       if (paned->priv->saved_focus &&
1367           GTK_WIDGET_SENSITIVE (paned->priv->saved_focus))
1368         {
1369           gtk_widget_grab_focus (paned->priv->saved_focus);
1370         }
1371       else
1372         {
1373           /* the saved focus is somehow not available for focusing,
1374            * try
1375            *   1) tabbing into the paned widget
1376            * if that didn't work,
1377            *   2) unset focus for the window if there is one
1378            */
1379
1380           if (!gtk_widget_child_focus (GTK_WIDGET (paned), GTK_DIR_TAB_FORWARD))
1381             {
1382               GtkWidget *toplevel = gtk_widget_get_toplevel (GTK_WIDGET (paned));
1383
1384               if (GTK_IS_WINDOW (toplevel))
1385                 gtk_window_set_focus (GTK_WINDOW (toplevel), NULL);
1386             }
1387         }
1388
1389       gtk_paned_set_saved_focus (paned, NULL);
1390       gtk_paned_set_first_paned (paned, NULL);
1391     }
1392 }
1393
1394 static gboolean
1395 gtk_paned_accept_position (GtkPaned *paned)
1396 {
1397   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
1398     {
1399       paned->original_position = -1;
1400       gtk_paned_restore_focus (paned);
1401
1402       return TRUE;
1403     }
1404
1405   return FALSE;
1406 }
1407
1408
1409 static gboolean
1410 gtk_paned_cancel_position (GtkPaned *paned)
1411 {
1412   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
1413     {
1414       if (paned->original_position != -1)
1415         {
1416           gtk_paned_set_position (paned, paned->original_position);
1417           paned->original_position = -1;
1418         }
1419
1420       gtk_paned_restore_focus (paned);
1421       return TRUE;
1422     }
1423
1424   return FALSE;
1425 }
1426
1427 static gboolean
1428 gtk_paned_cycle_handle_focus (GtkPaned *paned,
1429                               gboolean  reversed)
1430 {
1431   GtkPaned *next, *prev;
1432
1433   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
1434     {
1435       GtkPaned *focus = NULL;
1436
1437       if (!paned->priv->first_paned)
1438         {
1439           /* The first_pane has disappeared. As an ad-hoc solution,
1440            * we make the currently focused paned the first_paned. To the
1441            * user this will seem like the paned cycling has been reset.
1442            */
1443
1444           gtk_paned_set_first_paned (paned, paned);
1445         }
1446
1447       gtk_paned_find_neighbours (paned, &next, &prev);
1448
1449       if (reversed && prev &&
1450           prev != paned && paned != paned->priv->first_paned)
1451         {
1452           focus = prev;
1453         }
1454       else if (!reversed && next &&
1455                next != paned && next != paned->priv->first_paned)
1456         {
1457           focus = next;
1458         }
1459       else
1460         {
1461           gtk_paned_accept_position (paned);
1462           return TRUE;
1463         }
1464
1465       g_assert (focus);
1466
1467       gtk_paned_set_saved_focus (focus, paned->priv->saved_focus);
1468       gtk_paned_set_first_paned (focus, paned->priv->first_paned);
1469
1470       gtk_paned_set_saved_focus (paned, NULL);
1471       gtk_paned_set_first_paned (paned, NULL);
1472
1473       gtk_widget_grab_focus (GTK_WIDGET (focus));
1474
1475       if (!gtk_widget_is_focus (GTK_WIDGET (paned)))
1476         {
1477           paned->original_position = -1;
1478           focus->original_position = gtk_paned_get_position (focus);
1479         }
1480     }
1481   else
1482     {
1483       GtkContainer *container = GTK_CONTAINER (paned);
1484       GtkPaned *focus;
1485       GtkPaned *first;
1486       GtkPaned *prev, *next;
1487       GtkWidget *toplevel;
1488
1489       gtk_paned_find_neighbours (paned, &next, &prev);
1490
1491       if (container->focus_child == paned->child1)
1492         {
1493           if (reversed)
1494             {
1495               focus = prev;
1496               first = paned;
1497             }
1498           else
1499             {
1500               focus = paned;
1501               first = paned;
1502             }
1503         }
1504       else if (container->focus_child == paned->child2)
1505         {
1506           if (reversed)
1507             {
1508               focus = paned;
1509               first = next;
1510             }
1511           else
1512             {
1513               focus = next;
1514               first = next;
1515             }
1516         }
1517       else
1518         {
1519           /* Focus is not inside this paned, and we don't have focus.
1520            * Presumably this happened because the application wants us
1521            * to start keyboard navigating.
1522            */
1523           focus = paned;
1524
1525           if (reversed)
1526             first = paned;
1527           else
1528             first = next;
1529         }
1530
1531       toplevel = gtk_widget_get_toplevel (GTK_WIDGET (paned));
1532
1533       if (GTK_IS_WINDOW (toplevel))
1534         gtk_paned_set_saved_focus (focus, GTK_WINDOW (toplevel)->focus_widget);
1535       gtk_paned_set_first_paned (focus, first);
1536       focus->original_position = gtk_paned_get_position (focus);
1537
1538       gtk_widget_grab_focus (GTK_WIDGET (focus));
1539    }
1540
1541   return TRUE;
1542 }
1543
1544 static gboolean
1545 gtk_paned_toggle_handle_focus (GtkPaned *paned)
1546 {
1547   /* This function/signal has the wrong name. It is called when you
1548    * press Tab or Shift-Tab and what we do is act as if
1549    * the user pressed Return and then Tab or Shift-Tab
1550    */
1551   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
1552     gtk_paned_accept_position (paned);
1553
1554   return FALSE;
1555 }