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 "config.h"
  28
  29 #include "gtkpaned.h"
  30
  31 #include "gtkbindings.h"
  32 #include "gtkmain.h"
  33 #include "gtkmarshalers.h"
  34 #include "gtkorientable.h"
  35 #include "gtkwindow.h"
  36 #include "gtktypebuiltins.h"
  37 #include "gtkprivate.h"
  38 #include "gtkintl.h"
  39
  40
  41 /**
  42  * SECTION:gtkpaned
  43  * @Short_description: Base class for widgets with two adjustable panes
  44  * @Title: GtkPaned
  45  *
  46  * #GtkPaned is the base class for widgets with two panes, arranged either
  47  * horizontally (#GtkHPaned) or vertically (#GtkVPaned). Child widgets are
  48  * added to the panes of the widget with gtk_paned_pack1() and
  49  * gtk_paned_pack2(). The division between the two children is set by default
  50  * from the size requests of the children, but it can be adjusted by the
  51  * user.
  52  *
  53  * A paned widget draws a separator between the two child widgets and a
  54  * small handle that the user can drag to adjust the division. It does not
  55  * draw any relief around the children or around the separator. (The space
  56  * in which the separator is called the gutter.) Often, it is useful to put
  57  * each child inside a #GtkFrame with the shadow type set to %GTK_SHADOW_IN
  58  * so that the gutter appears as a ridge. No separator is drawn if one of
  59  * the children is missing.
  60  *
  61  * Each child has two options that can be set, @resize and @shrink. If
  62  * @resize is true, then when the #GtkPaned is resized, that child will
  63  * expand or shrink along with the paned widget. If @shrink is true, then
  64  * that child can be made smaller than its requisition by the user.
  65  * Setting @shrink to %FALSE allows the application to set a minimum size.
  66  * If @resize is false for both children, then this is treated as if
  67  * @resize is true for both children.
  68  *
  69  * The application can set the position of the slider as if it were set
  70  * by the user, by calling gtk_paned_set_position().
  71  *
  72  * <example>
  73  * <title>Creating a paned widget with minimum sizes.</title>
  74  * <programlisting>
  75  * GtkWidget *hpaned = gtk_paned_new (GTK_ORIENTATION_HORIZONTAL);
  76  * GtkWidget *frame1 = gtk_frame_new (NULL);
  77  * GtkWidget *frame2 = gtk_frame_new (NULL);
  78  * gtk_frame_set_shadow_type (GTK_FRAME (frame1), GTK_SHADOW_IN);
  79  * gtk_frame_set_shadow_type (GTK_FRAME (frame2), GTK_SHADOW_IN);
  80  *
  81  * gtk_widget_set_size_request (hpaned, 200, -1);
  82  *
  83  * gtk_paned_pack1 (GTK_PANED (hpaned), frame1, TRUE, FALSE);
  84  * gtk_widget_set_size_request (frame1, 50, -1);
  85  *
  86  * gtk_paned_pack2 (GTK_PANED (hpaned), frame2, FALSE, FALSE);
  87  * gtk_widget_set_size_request (frame2, 50, -1);
  88  * </programlisting>
  89  * </example>
  90  */
  91
  92 enum {
  93   CHILD1,
  94   CHILD2
  95 };
  96
  97 struct _GtkPanedPrivate
  98 {
  99   GtkPaned       *first_paned;
 100   GtkWidget      *child1;
 101   GtkWidget      *child2;
 102   GdkWindow      *child1_window;
 103   GdkWindow      *child2_window;
 104   GtkWidget      *last_child1_focus;
 105   GtkWidget      *last_child2_focus;
 106   GtkWidget      *saved_focus;
 107   GtkOrientation  orientation;
 108
 109   GdkCursorType  cursor_type;
 110   GdkDevice     *grab_device;
 111   GdkRectangle   handle_pos;
 112   GdkWindow     *handle;
 113
 114   gint          child1_size;
 115   gint          drag_pos;
 116   gint          last_allocation;
 117   gint          max_position;
 118   gint          min_position;
 119   gint          original_position;
 120
 121   guint32       grab_time;
 122
 123   guint         handle_prelit : 1;
 124   guint         in_drag       : 1;
 125   guint         in_recursion  : 1;
 126   guint         child1_resize : 1;
 127   guint         child1_shrink : 1;
 128   guint         child2_resize : 1;
 129   guint         child2_shrink : 1;
 130   guint         position_set  : 1;
 131 };
 132
 133 enum {
 134   PROP_0,
 135   PROP_ORIENTATION,
 136   PROP_POSITION,
 137   PROP_POSITION_SET,
 138   PROP_MIN_POSITION,
 139   PROP_MAX_POSITION
 140 };
 141
 142 enum {
 143   CHILD_PROP_0,
 144   CHILD_PROP_RESIZE,
 145   CHILD_PROP_SHRINK
 146 };
 147
 148 enum {
 149   CYCLE_CHILD_FOCUS,
 150   TOGGLE_HANDLE_FOCUS,
 151   MOVE_HANDLE,
 152   CYCLE_HANDLE_FOCUS,
 153   ACCEPT_POSITION,
 154   CANCEL_POSITION,
 155   LAST_SIGNAL
 156 };
 157
 158 static void     gtk_paned_set_property          (GObject          *object,
 159                                                  guint             prop_id,
 160                                                  const GValue     *value,
 161                                                  GParamSpec       *pspec);
 162 static void     gtk_paned_get_property          (GObject          *object,
 163                                                  guint             prop_id,
 164                                                  GValue           *value,
 165                                                  GParamSpec       *pspec);
 166 static void     gtk_paned_set_child_property    (GtkContainer     *container,
 167                                                  GtkWidget        *child,
 168                                                  guint             property_id,
 169                                                  const GValue     *value,
 170                                                  GParamSpec       *pspec);
 171 static void     gtk_paned_get_child_property    (GtkContainer     *container,
 172                                                  GtkWidget        *child,
 173                                                  guint             property_id,
 174                                                  GValue           *value,
 175                                                  GParamSpec       *pspec);
 176 static void     gtk_paned_finalize              (GObject          *object);
 177
 178 static void     gtk_paned_get_preferred_width   (GtkWidget        *widget,
 179                                                  gint             *minimum,
 180                                                  gint             *natural);
 181 static void     gtk_paned_get_preferred_height  (GtkWidget        *widget,
 182                                                  gint             *minimum,
 183                                                  gint             *natural);
 184 static void     gtk_paned_get_preferred_width_for_height
 185                                                 (GtkWidget        *widget,
 186                                                  gint              height,
 187                                                  gint             *minimum,
 188                                                  gint             *natural);
 189 static void     gtk_paned_get_preferred_height_for_width
 190                                                 (GtkWidget        *widget,
 191                                                  gint              width,
 192                                                  gint             *minimum,
 193                                                  gint              *natural);
 194
 195 static void     gtk_paned_size_allocate         (GtkWidget        *widget,
 196                                                  GtkAllocation    *allocation);
 197 static void     gtk_paned_realize               (GtkWidget        *widget);
 198 static void     gtk_paned_unrealize             (GtkWidget        *widget);
 199 static void     gtk_paned_map                   (GtkWidget        *widget);
 200 static void     gtk_paned_unmap                 (GtkWidget        *widget);
 201 static void     gtk_paned_state_flags_changed   (GtkWidget        *widget,
 202                                                  GtkStateFlags     previous_state);
 203 static gboolean gtk_paned_draw                  (GtkWidget        *widget,
 204                                                  cairo_t          *cr);
 205 static gboolean gtk_paned_enter                 (GtkWidget        *widget,
 206                                                  GdkEventCrossing *event);
 207 static gboolean gtk_paned_leave                 (GtkWidget        *widget,
 208                                                  GdkEventCrossing *event);
 209 static gboolean gtk_paned_button_press          (GtkWidget        *widget,
 210                                                  GdkEventButton   *event);
 211 static gboolean gtk_paned_button_release        (GtkWidget        *widget,
 212                                                  GdkEventButton   *event);
 213 static gboolean gtk_paned_motion                (GtkWidget        *widget,
 214                                                  GdkEventMotion   *event);
 215 static gboolean gtk_paned_focus                 (GtkWidget        *widget,
 216                                                  GtkDirectionType  direction);
 217 static gboolean gtk_paned_grab_broken           (GtkWidget          *widget,
 218                                                  GdkEventGrabBroken *event);
 219 static void     gtk_paned_add                   (GtkContainer     *container,
 220                                                  GtkWidget        *widget);
 221 static void     gtk_paned_remove                (GtkContainer     *container,
 222                                                  GtkWidget        *widget);
 223 static void     gtk_paned_forall                (GtkContainer     *container,
 224                                                  gboolean          include_internals,
 225                                                  GtkCallback       callback,
 226                                                  gpointer          callback_data);
 227 static void     gtk_paned_calc_position         (GtkPaned         *paned,
 228                                                  gint              allocation,
 229                                                  gint              child1_req,
 230                                                  gint              child2_req);
 231 static void     gtk_paned_set_focus_child       (GtkContainer     *container,
 232                                                  GtkWidget        *child);
 233 static void     gtk_paned_set_saved_focus       (GtkPaned         *paned,
 234                                                  GtkWidget        *widget);
 235 static void     gtk_paned_set_first_paned       (GtkPaned         *paned,
 236                                                  GtkPaned         *first_paned);
 237 static void     gtk_paned_set_last_child1_focus (GtkPaned         *paned,
 238                                                  GtkWidget        *widget);
 239 static void     gtk_paned_set_last_child2_focus (GtkPaned         *paned,
 240                                                  GtkWidget        *widget);
 241 static gboolean gtk_paned_cycle_child_focus     (GtkPaned         *paned,
 242                                                  gboolean          reverse);
 243 static gboolean gtk_paned_cycle_handle_focus    (GtkPaned         *paned,
 244                                                  gboolean          reverse);
 245 static gboolean gtk_paned_move_handle           (GtkPaned         *paned,
 246                                                  GtkScrollType     scroll);
 247 static gboolean gtk_paned_accept_position       (GtkPaned         *paned);
 248 static gboolean gtk_paned_cancel_position       (GtkPaned         *paned);
 249 static gboolean gtk_paned_toggle_handle_focus   (GtkPaned         *paned);
 250
 251 static GType    gtk_paned_child_type            (GtkContainer     *container);
 252 static void     gtk_paned_grab_notify           (GtkWidget        *widget,
 253                                                  gboolean          was_grabbed);
 254
 255
 256 G_DEFINE_TYPE_WITH_CODE (GtkPaned, gtk_paned, GTK_TYPE_CONTAINER,
 257                          G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE,
 258                                                 NULL))
 259
 260 static guint signals[LAST_SIGNAL] = { 0 };
 261
 262
 263 static void
 264 add_tab_bindings (GtkBindingSet    *binding_set,
 265                   GdkModifierType   modifiers)
 266 {
 267   gtk_binding_entry_add_signal (binding_set, GDK_KEY_Tab, modifiers,
 268                                 "toggle-handle-focus", 0);
 269   gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Tab, modifiers,
 270                                 "toggle-handle-focus", 0);
 271 }
 272
 273 static void
 274 add_move_binding (GtkBindingSet   *binding_set,
 275                   guint            keyval,
 276                   GdkModifierType  mask,
 277                   GtkScrollType    scroll)
 278 {
 279   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 280                                 "move-handle", 1,
 281                                 GTK_TYPE_SCROLL_TYPE, scroll);
 282 }
 283
 284 static void
 285 gtk_paned_class_init (GtkPanedClass *class)
 286 {
 287   GObjectClass *object_class;
 288   GtkWidgetClass *widget_class;
 289   GtkContainerClass *container_class;
 290   GtkPanedClass *paned_class;
 291   GtkBindingSet *binding_set;
 292
 293   object_class = (GObjectClass *) class;
 294   widget_class = (GtkWidgetClass *) class;
 295   container_class = (GtkContainerClass *) class;
 296   paned_class = (GtkPanedClass *) class;
 297
 298   object_class->set_property = gtk_paned_set_property;
 299   object_class->get_property = gtk_paned_get_property;
 300   object_class->finalize = gtk_paned_finalize;
 301
 302   widget_class->get_preferred_width = gtk_paned_get_preferred_width;
 303   widget_class->get_preferred_height = gtk_paned_get_preferred_height;
 304   widget_class->get_preferred_width_for_height = gtk_paned_get_preferred_width_for_height;
 305   widget_class->get_preferred_height_for_width = gtk_paned_get_preferred_height_for_width;
 306   widget_class->size_allocate = gtk_paned_size_allocate;
 307   widget_class->realize = gtk_paned_realize;
 308   widget_class->unrealize = gtk_paned_unrealize;
 309   widget_class->map = gtk_paned_map;
 310   widget_class->unmap = gtk_paned_unmap;
 311   widget_class->draw = gtk_paned_draw;
 312   widget_class->focus = gtk_paned_focus;
 313   widget_class->enter_notify_event = gtk_paned_enter;
 314   widget_class->leave_notify_event = gtk_paned_leave;
 315   widget_class->button_press_event = gtk_paned_button_press;
 316   widget_class->button_release_event = gtk_paned_button_release;
 317   widget_class->motion_notify_event = gtk_paned_motion;
 318   widget_class->grab_broken_event = gtk_paned_grab_broken;
 319   widget_class->grab_notify = gtk_paned_grab_notify;
 320   widget_class->state_flags_changed = gtk_paned_state_flags_changed;
 321
 322   container_class->add = gtk_paned_add;
 323   container_class->remove = gtk_paned_remove;
 324   container_class->forall = gtk_paned_forall;
 325   container_class->child_type = gtk_paned_child_type;
 326   container_class->set_focus_child = gtk_paned_set_focus_child;
 327   container_class->set_child_property = gtk_paned_set_child_property;
 328   container_class->get_child_property = gtk_paned_get_child_property;
 329   gtk_container_class_handle_border_width (container_class);
 330
 331   paned_class->cycle_child_focus = gtk_paned_cycle_child_focus;
 332   paned_class->toggle_handle_focus = gtk_paned_toggle_handle_focus;
 333   paned_class->move_handle = gtk_paned_move_handle;
 334   paned_class->cycle_handle_focus = gtk_paned_cycle_handle_focus;
 335   paned_class->accept_position = gtk_paned_accept_position;
 336   paned_class->cancel_position = gtk_paned_cancel_position;
 337
 338   g_object_class_override_property (object_class,
 339                                     PROP_ORIENTATION,
 340                                     "orientation");
 341
 342   g_object_class_install_property (object_class,
 343                                    PROP_POSITION,
 344                                    g_param_spec_int ("position",
 345                                                      P_("Position"),
 346                                                      P_("Position of paned separator in pixels (0 means all the way to the left/top)"),
 347                                                      0,
 348                                                      G_MAXINT,
 349                                                      0,
 350                                                      GTK_PARAM_READWRITE));
 351
 352   g_object_class_install_property (object_class,
 353                                    PROP_POSITION_SET,
 354                                    g_param_spec_boolean ("position-set",
 355                                                          P_("Position Set"),
 356                                                          P_("TRUE if the Position property should be used"),
 357                                                          FALSE,
 358                                                          GTK_PARAM_READWRITE));
 359
 360   gtk_widget_class_install_style_property (widget_class,
 361                                            g_param_spec_int ("handle-size",
 362                                                              P_("Handle Size"),
 363                                                              P_("Width of handle"),
 364                                                              0,
 365                                                              G_MAXINT,
 366                                                              5,
 367                                                              GTK_PARAM_READABLE));
 368   /**
 369    * GtkPaned:min-position:
 370    *
 371    * The smallest possible value for the position property. This property is derived from the
 372    * size and shrinkability of the widget's children.
 373    *
 374    * Since: 2.4
 375    */
 376   g_object_class_install_property (object_class,
 377                                    PROP_MIN_POSITION,
 378                                    g_param_spec_int ("min-position",
 379                                                      P_("Minimal Position"),
 380                                                      P_("Smallest possible value for the \"position\" property"),
 381                                                      0,
 382                                                      G_MAXINT,
 383                                                      0,
 384                                                      GTK_PARAM_READABLE));
 385
 386   /**
 387    * GtkPaned:max-position:
 388    *
 389    * The largest possible value for the position property. This property is derived from the
 390    * size and shrinkability of the widget's children.
 391    *
 392    * Since: 2.4
 393    */
 394   g_object_class_install_property (object_class,
 395                                    PROP_MAX_POSITION,
 396                                    g_param_spec_int ("max-position",
 397                                                      P_("Maximal Position"),
 398                                                      P_("Largest possible value for the \"position\" property"),
 399                                                      0,
 400                                                      G_MAXINT,
 401                                                      G_MAXINT,
 402                                                      GTK_PARAM_READABLE));
 403
 404   /**
 405    * GtkPaned:resize:
 406    *
 407    * The "resize" child property determines whether the child expands and
 408    * shrinks along with the paned widget.
 409    *
 410    * Since: 2.4
 411    */
 412   gtk_container_class_install_child_property (container_class,
 413                                               CHILD_PROP_RESIZE,
 414                                               g_param_spec_boolean ("resize",
 415                                                                     P_("Resize"),
 416                                                                     P_("If TRUE, the child expands and shrinks along with the paned widget"),
 417                                                                     TRUE,
 418                                                                     GTK_PARAM_READWRITE));
 419
 420   /**
 421    * GtkPaned:shrink:
 422    *
 423    * The "shrink" child property determines whether the child can be made
 424    * smaller than its requisition.
 425    *
 426    * Since: 2.4
 427    */
 428   gtk_container_class_install_child_property (container_class,
 429                                               CHILD_PROP_SHRINK,
 430                                               g_param_spec_boolean ("shrink",
 431                                                                     P_("Shrink"),
 432                                                                     P_("If TRUE, the child can be made smaller than its requisition"),
 433                                                                     TRUE,
 434                                                                     GTK_PARAM_READWRITE));
 435
 436   /**
 437    * GtkPaned::cycle-child-focus:
 438    * @widget: the object that received the signal
 439    * @reversed: whether cycling backward or forward
 440    *
 441    * The ::cycle-child-focus signal is a
 442    * <link linkend="keybinding-signals">keybinding signal</link>
 443    * which gets emitted to cycle the focus between the children of the paned.
 444    *
 445    * The default binding is f6.
 446    *
 447    * Since: 2.0
 448    */
 449   signals [CYCLE_CHILD_FOCUS] =
 450     g_signal_new (I_("cycle-child-focus"),
 451                   G_TYPE_FROM_CLASS (object_class),
 452                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 453                   G_STRUCT_OFFSET (GtkPanedClass, cycle_child_focus),
 454                   NULL, NULL,
 455                   _gtk_marshal_BOOLEAN__BOOLEAN,
 456                   G_TYPE_BOOLEAN, 1,
 457                   G_TYPE_BOOLEAN);
 458
 459   /**
 460    * GtkPaned::toggle-handle-focus:
 461    * @widget: the object that received the signal
 462    *
 463    * The ::toggle-handle-focus is a
 464    * <link linkend="keybinding-signals">keybinding signal</link>
 465    * which gets emitted to accept the current position of the handle and then
 466    * move focus to the next widget in the focus chain.
 467    *
 468    * The default binding is Tab.
 469    *
 470    * Since: 2.0
 471    */
 472   signals [TOGGLE_HANDLE_FOCUS] =
 473     g_signal_new (I_("toggle-handle-focus"),
 474                   G_TYPE_FROM_CLASS (object_class),
 475                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 476                   G_STRUCT_OFFSET (GtkPanedClass, toggle_handle_focus),
 477                   NULL, NULL,
 478                   _gtk_marshal_BOOLEAN__VOID,
 479                   G_TYPE_BOOLEAN, 0);
 480
 481   /**
 482    * GtkPaned::move-handle:
 483    * @widget: the object that received the signal
 484    * @scroll_type: a #GtkScrollType
 485    *
 486    * The ::move-handle signal is a
 487    * <link linkend="keybinding-signals">keybinding signal</link>
 488    * which gets emitted to move the handle when the user is using key bindings
 489    * to move it.
 490    *
 491    * Since: 2.0
 492    */
 493   signals[MOVE_HANDLE] =
 494     g_signal_new (I_("move-handle"),
 495                   G_TYPE_FROM_CLASS (object_class),
 496                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 497                   G_STRUCT_OFFSET (GtkPanedClass, move_handle),
 498                   NULL, NULL,
 499                   _gtk_marshal_BOOLEAN__ENUM,
 500                   G_TYPE_BOOLEAN, 1,
 501                   GTK_TYPE_SCROLL_TYPE);
 502
 503   /**
 504    * GtkPaned::cycle-handle-focus:
 505    * @widget: the object that received the signal
 506    * @reversed: whether cycling backward or forward
 507    *
 508    * The ::cycle-handle-focus signal is a
 509    * <link linkend="keybinding-signals">keybinding signal</link>
 510    * which gets emitted to cycle whether the paned should grab focus to allow
 511    * the user to change position of the handle by using key bindings.
 512    *
 513    * The default binding for this signal is f8.
 514    *
 515    * Since: 2.0
 516    */
 517   signals [CYCLE_HANDLE_FOCUS] =
 518     g_signal_new (I_("cycle-handle-focus"),
 519                   G_TYPE_FROM_CLASS (object_class),
 520                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 521                   G_STRUCT_OFFSET (GtkPanedClass, cycle_handle_focus),
 522                   NULL, NULL,
 523                   _gtk_marshal_BOOLEAN__BOOLEAN,
 524                   G_TYPE_BOOLEAN, 1,
 525                   G_TYPE_BOOLEAN);
 526
 527   /**
 528    * GtkPaned::accept-position:
 529    * @widget: the object that received the signal
 530    *
 531    * The ::accept-position signal is a
 532    * <link linkend="keybinding-signals">keybinding signal</link>
 533    * which gets emitted to accept the current position of the handle when
 534    * moving it using key bindings.
 535    *
 536    * The default binding for this signal is Return or Space.
 537    *
 538    * Since: 2.0
 539    */
 540   signals [ACCEPT_POSITION] =
 541     g_signal_new (I_("accept-position"),
 542                   G_TYPE_FROM_CLASS (object_class),
 543                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 544                   G_STRUCT_OFFSET (GtkPanedClass, accept_position),
 545                   NULL, NULL,
 546                   _gtk_marshal_BOOLEAN__VOID,
 547                   G_TYPE_BOOLEAN, 0);
 548
 549   /**
 550    * GtkPaned::cancel-position:
 551    * @widget: the object that received the signal
 552    *
 553    * The ::cancel-position signal is a
 554    * <link linkend="keybinding-signals">keybinding signal</link>
 555    * which gets emitted to cancel moving the position of the handle using key
 556    * bindings. The position of the handle will be reset to the value prior to
 557    * moving it.
 558    *
 559    * The default binding for this signal is Escape.
 560    *
 561    * Since: 2.0
 562    */
 563   signals [CANCEL_POSITION] =
 564     g_signal_new (I_("cancel-position"),
 565                   G_TYPE_FROM_CLASS (object_class),
 566                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 567                   G_STRUCT_OFFSET (GtkPanedClass, cancel_position),
 568                   NULL, NULL,
 569                   _gtk_marshal_BOOLEAN__VOID,
 570                   G_TYPE_BOOLEAN, 0);
 571
 572   binding_set = gtk_binding_set_by_class (class);
 573
 574   /* F6 and friends */
 575   gtk_binding_entry_add_signal (binding_set,
 576                                 GDK_KEY_F6, 0,
 577                                 "cycle-child-focus", 1,
 578                                 G_TYPE_BOOLEAN, FALSE);
 579   gtk_binding_entry_add_signal (binding_set,
 580                                 GDK_KEY_F6, GDK_SHIFT_MASK,
 581                                 "cycle-child-focus", 1,
 582                                 G_TYPE_BOOLEAN, TRUE);
 583
 584   /* F8 and friends */
 585   gtk_binding_entry_add_signal (binding_set,
 586                                 GDK_KEY_F8, 0,
 587                                 "cycle-handle-focus", 1,
 588                                 G_TYPE_BOOLEAN, FALSE);
 589
 590   gtk_binding_entry_add_signal (binding_set,
 591                                 GDK_KEY_F8, GDK_SHIFT_MASK,
 592                                 "cycle-handle-focus", 1,
 593                                 G_TYPE_BOOLEAN, TRUE);
 594
 595   add_tab_bindings (binding_set, 0);
 596   add_tab_bindings (binding_set, GDK_CONTROL_MASK);
 597   add_tab_bindings (binding_set, GDK_SHIFT_MASK);
 598   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK);
 599
 600   /* accept and cancel positions */
 601   gtk_binding_entry_add_signal (binding_set,
 602                                 GDK_KEY_Escape, 0,
 603                                 "cancel-position", 0);
 604
 605   gtk_binding_entry_add_signal (binding_set,
 606                                 GDK_KEY_Return, 0,
 607                                 "accept-position", 0);
 608   gtk_binding_entry_add_signal (binding_set,
 609                                 GDK_KEY_ISO_Enter, 0,
 610                                 "accept-position", 0);
 611   gtk_binding_entry_add_signal (binding_set,
 612                                 GDK_KEY_KP_Enter, 0,
 613                                 "accept-position", 0);
 614   gtk_binding_entry_add_signal (binding_set,
 615                                 GDK_KEY_space, 0,
 616                                 "accept-position", 0);
 617   gtk_binding_entry_add_signal (binding_set,
 618                                 GDK_KEY_KP_Space, 0,
 619                                 "accept-position", 0);
 620
 621   /* move handle */
 622   add_move_binding (binding_set, GDK_KEY_Left, 0, GTK_SCROLL_STEP_LEFT);
 623   add_move_binding (binding_set, GDK_KEY_KP_Left, 0, GTK_SCROLL_STEP_LEFT);
 624   add_move_binding (binding_set, GDK_KEY_Left, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_LEFT);
 625   add_move_binding (binding_set, GDK_KEY_KP_Left, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_LEFT);
 626
 627   add_move_binding (binding_set, GDK_KEY_Right, 0, GTK_SCROLL_STEP_RIGHT);
 628   add_move_binding (binding_set, GDK_KEY_Right, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_RIGHT);
 629   add_move_binding (binding_set, GDK_KEY_KP_Right, 0, GTK_SCROLL_STEP_RIGHT);
 630   add_move_binding (binding_set, GDK_KEY_KP_Right, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_RIGHT);
 631
 632   add_move_binding (binding_set, GDK_KEY_Up, 0, GTK_SCROLL_STEP_UP);
 633   add_move_binding (binding_set, GDK_KEY_Up, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_UP);
 634   add_move_binding (binding_set, GDK_KEY_KP_Up, 0, GTK_SCROLL_STEP_UP);
 635   add_move_binding (binding_set, GDK_KEY_KP_Up, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_UP);
 636   add_move_binding (binding_set, GDK_KEY_Page_Up, 0, GTK_SCROLL_PAGE_UP);
 637   add_move_binding (binding_set, GDK_KEY_KP_Page_Up, 0, GTK_SCROLL_PAGE_UP);
 638
 639   add_move_binding (binding_set, GDK_KEY_Down, 0, GTK_SCROLL_STEP_DOWN);
 640   add_move_binding (binding_set, GDK_KEY_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_DOWN);
 641   add_move_binding (binding_set, GDK_KEY_KP_Down, 0, GTK_SCROLL_STEP_DOWN);
 642   add_move_binding (binding_set, GDK_KEY_KP_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_DOWN);
 643   add_move_binding (binding_set, GDK_KEY_Page_Down, 0, GTK_SCROLL_PAGE_RIGHT);
 644   add_move_binding (binding_set, GDK_KEY_KP_Page_Down, 0, GTK_SCROLL_PAGE_RIGHT);
 645
 646   add_move_binding (binding_set, GDK_KEY_Home, 0, GTK_SCROLL_START);
 647   add_move_binding (binding_set, GDK_KEY_KP_Home, 0, GTK_SCROLL_START);
 648   add_move_binding (binding_set, GDK_KEY_End, 0, GTK_SCROLL_END);
 649   add_move_binding (binding_set, GDK_KEY_KP_End, 0, GTK_SCROLL_END);
 650
 651   g_type_class_add_private (object_class, sizeof (GtkPanedPrivate));
 652 }
 653
 654 static GType
 655 gtk_paned_child_type (GtkContainer *container)
 656 {
 657   GtkPaned *paned = GTK_PANED (container);
 658   GtkPanedPrivate *priv = paned->priv;
 659
 660   if (!priv->child1 || !priv->child2)
 661     return GTK_TYPE_WIDGET;
 662   else
 663     return G_TYPE_NONE;
 664 }
 665
 666 static void
 667 gtk_paned_init (GtkPaned *paned)
 668 {
 669   GtkPanedPrivate *priv;
 670
 671   gtk_widget_set_has_window (GTK_WIDGET (paned), FALSE);
 672   gtk_widget_set_can_focus (GTK_WIDGET (paned), TRUE);
 673
 674   /* We only need to redraw when the handle position moves, which is
 675    * independent of the overall allocation of the GtkPaned
 676    */
 677   gtk_widget_set_redraw_on_allocate (GTK_WIDGET (paned), FALSE);
 678
 679   paned->priv = G_TYPE_INSTANCE_GET_PRIVATE (paned, GTK_TYPE_PANED, GtkPanedPrivate);
 680   priv = paned->priv;
 681
 682   priv->orientation = GTK_ORIENTATION_HORIZONTAL;
 683   priv->cursor_type = GDK_SB_H_DOUBLE_ARROW;
 684
 685   priv->child1 = NULL;
 686   priv->child2 = NULL;
 687   priv->handle = NULL;
 688   priv->cursor_type = GDK_CROSS;
 689
 690   priv->handle_pos.width = 5;
 691   priv->handle_pos.height = 5;
 692   priv->position_set = FALSE;
 693   priv->last_allocation = -1;
 694   priv->in_drag = FALSE;
 695
 696   priv->last_child1_focus = NULL;
 697   priv->last_child2_focus = NULL;
 698   priv->in_recursion = FALSE;
 699   priv->handle_prelit = FALSE;
 700   priv->original_position = -1;
 701
 702   priv->handle_pos.x = -1;
 703   priv->handle_pos.y = -1;
 704
 705   priv->drag_pos = -1;
 706 }
 707
 708 static void
 709 gtk_paned_set_property (GObject        *object,
 710                         guint           prop_id,
 711                         const GValue   *value,
 712                         GParamSpec     *pspec)
 713 {
 714   GtkPaned *paned = GTK_PANED (object);
 715   GtkPanedPrivate *priv = paned->priv;
 716
 717   switch (prop_id)
 718     {
 719     case PROP_ORIENTATION:
 720       priv->orientation = g_value_get_enum (value);
 721
 722       if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
 723         priv->cursor_type = GDK_SB_H_DOUBLE_ARROW;
 724       else
 725         priv->cursor_type = GDK_SB_V_DOUBLE_ARROW;
 726
 727       /* state_flags_changed updates the cursor */
 728       gtk_paned_state_flags_changed (GTK_WIDGET (paned), 0);
 729       gtk_widget_queue_resize (GTK_WIDGET (paned));
 730       break;
 731     case PROP_POSITION:
 732       gtk_paned_set_position (paned, g_value_get_int (value));
 733       break;
 734     case PROP_POSITION_SET:
 735       priv->position_set = g_value_get_boolean (value);
 736       gtk_widget_queue_resize_no_redraw (GTK_WIDGET (paned));
 737       break;
 738     default:
 739       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 740       break;
 741     }
 742 }
 743
 744 static void
 745 gtk_paned_get_property (GObject        *object,
 746                         guint           prop_id,
 747                         GValue         *value,
 748                         GParamSpec     *pspec)
 749 {
 750   GtkPaned *paned = GTK_PANED (object);
 751   GtkPanedPrivate *priv = paned->priv;
 752
 753   switch (prop_id)
 754     {
 755     case PROP_ORIENTATION:
 756       g_value_set_enum (value, priv->orientation);
 757       break;
 758     case PROP_POSITION:
 759       g_value_set_int (value, priv->child1_size);
 760       break;
 761     case PROP_POSITION_SET:
 762       g_value_set_boolean (value, priv->position_set);
 763       break;
 764     case PROP_MIN_POSITION:
 765       g_value_set_int (value, priv->min_position);
 766       break;
 767     case PROP_MAX_POSITION:
 768       g_value_set_int (value, priv->max_position);
 769       break;
 770     default:
 771       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 772       break;
 773     }
 774 }
 775
 776 static void
 777 gtk_paned_set_child_property (GtkContainer    *container,
 778                               GtkWidget       *child,
 779                               guint            property_id,
 780                               const GValue    *value,
 781                               GParamSpec      *pspec)
 782 {
 783   GtkPaned *paned = GTK_PANED (container);
 784   GtkPanedPrivate *priv = paned->priv;
 785   gboolean old_value, new_value;
 786
 787   g_assert (child == priv->child1 || child == priv->child2);
 788
 789   new_value = g_value_get_boolean (value);
 790   switch (property_id)
 791     {
 792     case CHILD_PROP_RESIZE:
 793       if (child == priv->child1)
 794         {
 795           old_value = priv->child1_resize;
 796           priv->child1_resize = new_value;
 797         }
 798       else
 799         {
 800           old_value = priv->child2_resize;
 801           priv->child2_resize = new_value;
 802         }
 803       break;
 804     case CHILD_PROP_SHRINK:
 805       if (child == priv->child1)
 806         {
 807           old_value = priv->child1_shrink;
 808           priv->child1_shrink = new_value;
 809         }
 810       else
 811         {
 812           old_value = priv->child2_shrink;
 813           priv->child2_shrink = new_value;
 814         }
 815       break;
 816     default:
 817       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 818       old_value = -1; /* quiet gcc */
 819       break;
 820     }
 821   if (old_value != new_value)
 822     gtk_widget_queue_resize_no_redraw (GTK_WIDGET (container));
 823 }
 824
 825 static void
 826 gtk_paned_get_child_property (GtkContainer *container,
 827                               GtkWidget    *child,
 828                               guint         property_id,
 829                               GValue       *value,
 830                               GParamSpec   *pspec)
 831 {
 832   GtkPaned *paned = GTK_PANED (container);
 833   GtkPanedPrivate *priv = paned->priv;
 834
 835   g_assert (child == priv->child1 || child == priv->child2);
 836
 837   switch (property_id)
 838     {
 839     case CHILD_PROP_RESIZE:
 840       if (child == priv->child1)
 841         g_value_set_boolean (value, priv->child1_resize);
 842       else
 843         g_value_set_boolean (value, priv->child2_resize);
 844       break;
 845     case CHILD_PROP_SHRINK:
 846       if (child == priv->child1)
 847         g_value_set_boolean (value, priv->child1_shrink);
 848       else
 849         g_value_set_boolean (value, priv->child2_shrink);
 850       break;
 851     default:
 852       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 853       break;
 854     }
 855 }
 856
 857 static void
 858 gtk_paned_finalize (GObject *object)
 859 {
 860   GtkPaned *paned = GTK_PANED (object);
 861
 862   gtk_paned_set_saved_focus (paned, NULL);
 863   gtk_paned_set_first_paned (paned, NULL);
 864
 865   G_OBJECT_CLASS (gtk_paned_parent_class)->finalize (object);
 866 }
 867
 868 static void
 869 get_preferred_size_for_size (GtkWidget      *widget,
 870                              GtkOrientation  orientation,
 871                              gint            size,
 872                              gint           *minimum,
 873                              gint           *natural)
 874 {
 875   if (orientation == GTK_ORIENTATION_HORIZONTAL)
 876     if (size < 0)
 877       gtk_widget_get_preferred_width (widget, minimum, natural);
 878     else
 879       gtk_widget_get_preferred_width_for_height (widget, size, minimum, natural);
 880   else
 881     if (size < 0)
 882       gtk_widget_get_preferred_height (widget, minimum, natural);
 883     else
 884       gtk_widget_get_preferred_height_for_width (widget, size, minimum, natural);
 885 }
 886
 887 static void
 888 gtk_paned_get_preferred_size (GtkWidget      *widget,
 889                               GtkOrientation  orientation,
 890                               gint            size,
 891                               gint           *minimum,
 892                               gint           *natural)
 893 {
 894   GtkPaned *paned = GTK_PANED (widget);
 895   GtkPanedPrivate *priv = paned->priv;
 896   gint child_min, child_nat;
 897
 898   *minimum = *natural = 0;
 899
 900   if (priv->child1 && gtk_widget_get_visible (priv->child1))
 901     {
 902       get_preferred_size_for_size (priv->child1, orientation, size, &child_min, &child_nat);
 903       *minimum = child_min;
 904       *natural = child_nat;
 905     }
 906
 907   if (priv->child2 && gtk_widget_get_visible (priv->child2))
 908     {
 909       get_preferred_size_for_size (priv->child2, orientation, size, &child_min, &child_nat);
 910
 911       if (priv->orientation == orientation)
 912         {
 913           *minimum += child_min;
 914           *natural += child_nat;
 915         }
 916       else
 917         {
 918           *minimum = MAX (*minimum, child_min);
 919           *natural = MAX (*natural, child_nat);
 920         }
 921     }
 922
 923   if (priv->child1 && gtk_widget_get_visible (priv->child1) &&
 924       priv->child2 && gtk_widget_get_visible (priv->child2))
 925     {
 926       gint handle_size;
 927
 928       gtk_widget_style_get (widget, "handle-size", &handle_size, NULL);
 929
 930       if (priv->orientation == orientation)
 931         {
 932           *minimum += handle_size;
 933           *natural += handle_size;
 934         }
 935     }
 936 }
 937
 938 static void
 939 gtk_paned_get_preferred_width (GtkWidget *widget,
 940                                gint      *minimum,
 941                                gint      *natural)
 942 {
 943   gtk_paned_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, -1, minimum, natural);
 944 }
 945
 946 static void
 947 gtk_paned_get_preferred_height (GtkWidget *widget,
 948                                 gint      *minimum,
 949                                 gint      *natural)
 950 {
 951   gtk_paned_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, -1, minimum, natural);
 952 }
 953
 954 static void
 955 gtk_paned_get_preferred_width_for_height (GtkWidget *widget,
 956                                           gint       height,
 957                                           gint      *minimum,
 958                                           gint      *natural)
 959 {
 960   gtk_paned_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, height, minimum, natural);
 961 }
 962
 963 static void
 964 gtk_paned_get_preferred_height_for_width (GtkWidget *widget,
 965                                           gint       width,
 966                                           gint      *minimum,
 967                                           gint      *natural)
 968 {
 969   gtk_paned_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, width, minimum, natural);
 970 }
 971
 972 static void
 973 flip_child (GtkWidget     *widget,
 974             GtkAllocation *child_pos)
 975 {
 976   GtkAllocation allocation;
 977   gint x, width;
 978
 979   gtk_widget_get_allocation (widget, &allocation);
 980   x = allocation.x;
 981   width = allocation.width;
 982
 983   child_pos->x = 2 * x + width - child_pos->x - child_pos->width;
 984 }
 985
 986 static void
 987 gtk_paned_set_child_visible (GtkPaned  *paned,
 988                              guint      id,
 989                              gboolean   visible)
 990 {
 991   GtkPanedPrivate *priv = paned->priv;
 992   GtkWidget *child;
 993
 994   child = id == CHILD1 ? priv->child1 : priv->child2;
 995
 996   if (child == NULL)
 997     return;
 998
 999   gtk_widget_set_child_visible (child, visible);
1000
1001   if (gtk_widget_get_mapped (GTK_WIDGET (paned)))
1002     {
1003       GdkWindow *window = id == CHILD1 ? priv->child1_window : priv->child2_window;
1004
1005       if (visible != gdk_window_is_visible (window))
1006         {
1007           if (visible)
1008             gdk_window_show (window);
1009           else
1010             gdk_window_hide (window);
1011         }
1012     }
1013 }
1014
1015 static void
1016 gtk_paned_child_allocate (GtkWidget           *child,
1017                           GdkWindow           *child_window, /* can be NULL */
1018                           const GtkAllocation *window_allocation,
1019                           GtkAllocation       *child_allocation)
1020 {
1021   if (child_window)
1022     gdk_window_move_resize (child_window,
1023                             window_allocation->x, window_allocation->y,
1024                             window_allocation->width, window_allocation->height);
1025
1026   gtk_widget_size_allocate (child, child_allocation);
1027 }
1028
1029 static void
1030 gtk_paned_size_allocate (GtkWidget     *widget,
1031                          GtkAllocation *allocation)
1032 {
1033   GtkPaned *paned = GTK_PANED (widget);
1034   GtkPanedPrivate *priv = paned->priv;
1035
1036   gtk_widget_set_allocation (widget, allocation);
1037
1038   if (priv->child1 && gtk_widget_get_visible (priv->child1) &&
1039       priv->child2 && gtk_widget_get_visible (priv->child2))
1040     {
1041       GtkAllocation child1_allocation, window1_allocation;
1042       GtkAllocation child2_allocation, window2_allocation;
1043       GtkAllocation priv_child1_allocation;
1044       GdkRectangle old_handle_pos;
1045       gint handle_size;
1046
1047       gtk_widget_style_get (widget, "handle-size", &handle_size, NULL);
1048
1049       old_handle_pos = priv->handle_pos;
1050
1051       if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
1052         {
1053           gint child1_width, child2_width;
1054
1055           gtk_widget_get_preferred_width_for_height (priv->child1,
1056                                                      allocation->height,
1057                                                      &child1_width, NULL);
1058           gtk_widget_get_preferred_width_for_height (priv->child2,
1059                                                      allocation->height,
1060                                                      &child2_width, NULL);
1061
1062           gtk_paned_calc_position (paned,
1063                                    MAX (1, allocation->width - handle_size),
1064                                    child1_width,
1065                                    child2_width);
1066
1067           priv->handle_pos.x = allocation->x + priv->child1_size;
1068           priv->handle_pos.y = allocation->y;
1069           priv->handle_pos.width = handle_size;
1070           priv->handle_pos.height = allocation->height;
1071
1072           window1_allocation.height = window2_allocation.height = allocation->height;
1073           window1_allocation.width = MAX (1, priv->child1_size);
1074           window1_allocation.x = allocation->x;
1075           window1_allocation.y = window2_allocation.y = allocation->y;
1076
1077           window2_allocation.x = window1_allocation.x + priv->child1_size + priv->handle_pos.width;
1078           window2_allocation.width = MAX (1, allocation->x + allocation->width - window2_allocation.x);
1079
1080           if (gtk_widget_get_direction (GTK_WIDGET (widget)) == GTK_TEXT_DIR_RTL)
1081             {
1082               flip_child (widget, &(window2_allocation));
1083               flip_child (widget, &(window1_allocation));
1084               flip_child (widget, &(priv->handle_pos));
1085             }
1086
1087           child1_allocation.x = child1_allocation.y = 0;
1088           child1_allocation.width = window1_allocation.width;
1089           child1_allocation.height = window1_allocation.height;
1090           if (child1_width > child1_allocation.width)
1091             {
1092               if (gtk_widget_get_direction (GTK_WIDGET (widget)) == GTK_TEXT_DIR_LTR)
1093                 child1_allocation.x -= child1_width - child1_allocation.width;
1094               child1_allocation.width = child1_width;
1095             }
1096
1097           child2_allocation.x = child2_allocation.y = 0;
1098           child2_allocation.width = window2_allocation.width;
1099           child2_allocation.height = window2_allocation.height;
1100           if (child2_width > child2_allocation.width)
1101             {
1102               if (gtk_widget_get_direction (GTK_WIDGET (widget)) == GTK_TEXT_DIR_RTL)
1103                 child2_allocation.x -= child2_width - child2_allocation.width;
1104               child2_allocation.width = child2_width;
1105             }
1106         }
1107       else
1108         {
1109           gint child1_height, child2_height;
1110
1111           gtk_widget_get_preferred_height_for_width (priv->child1,
1112                                                      allocation->width,
1113                                                      &child1_height, NULL);
1114           gtk_widget_get_preferred_height_for_width (priv->child2,
1115                                                      allocation->width,
1116                                                      &child2_height, NULL);
1117
1118           gtk_paned_calc_position (paned,
1119                                    MAX (1, allocation->height - handle_size),
1120                                    child1_height,
1121                                    child2_height);
1122
1123           priv->handle_pos.x = allocation->x;
1124           priv->handle_pos.y = allocation->y + priv->child1_size;
1125           priv->handle_pos.width = allocation->width;
1126           priv->handle_pos.height = handle_size;
1127
1128           window1_allocation.width = window2_allocation.width = allocation->width;
1129           window1_allocation.height = MAX (1, priv->child1_size);
1130           window1_allocation.x = window2_allocation.x = allocation->x;
1131           window1_allocation.y = allocation->y;
1132
1133           window2_allocation.y = window1_allocation.y + priv->child1_size + priv->handle_pos.height;
1134           window2_allocation.height = MAX (1, allocation->y + allocation->height - window2_allocation.y);
1135
1136           child1_allocation.x = child1_allocation.y = 0;
1137           child1_allocation.width = window1_allocation.width;
1138           child1_allocation.height = window1_allocation.height;
1139           if (child1_height > child1_allocation.height)
1140             {
1141               child1_allocation.y -= child1_height - child1_allocation.height;
1142               child1_allocation.height = child1_height;
1143             }
1144
1145           child2_allocation.x = child2_allocation.y = 0;
1146           child2_allocation.width = window2_allocation.width;
1147           child2_allocation.height = window2_allocation.height;
1148           if (child2_height > child2_allocation.height)
1149             child2_allocation.height = child2_height;
1150         }
1151
1152       if (gtk_widget_get_mapped (widget) &&
1153           (old_handle_pos.x != priv->handle_pos.x ||
1154            old_handle_pos.y != priv->handle_pos.y ||
1155            old_handle_pos.width != priv->handle_pos.width ||
1156            old_handle_pos.height != priv->handle_pos.height))
1157         {
1158           GdkWindow *window;
1159
1160           window = gtk_widget_get_window (widget);
1161           gdk_window_invalidate_rect (window, &old_handle_pos, FALSE);
1162           gdk_window_invalidate_rect (window, &priv->handle_pos, FALSE);
1163         }
1164
1165       if (gtk_widget_get_realized (widget))
1166         {
1167           if (gtk_widget_get_mapped (widget))
1168             gdk_window_show (priv->handle);
1169
1170           if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
1171             {
1172               gdk_window_move_resize (priv->handle,
1173                                       priv->handle_pos.x,
1174                                       priv->handle_pos.y,
1175                                       handle_size,
1176                                       priv->handle_pos.height);
1177             }
1178           else
1179             {
1180               gdk_window_move_resize (priv->handle,
1181                                       priv->handle_pos.x,
1182                                       priv->handle_pos.y,
1183                                       priv->handle_pos.width,
1184                                       handle_size);
1185             }
1186         }
1187
1188       /* Now allocate the childen, making sure, when resizing not to
1189        * overlap the windows
1190        */
1191       gtk_widget_get_allocation (priv->child1, &priv_child1_allocation);
1192       if (gtk_widget_get_mapped (widget) &&
1193           ((priv->orientation == GTK_ORIENTATION_HORIZONTAL &&
1194             priv_child1_allocation.width < child1_allocation.width) ||
1195
1196            (priv->orientation == GTK_ORIENTATION_VERTICAL &&
1197             priv_child1_allocation.height < child1_allocation.height)))
1198         {
1199           gtk_paned_child_allocate (priv->child2,
1200                                     priv->child2_window,
1201                                     &window2_allocation,
1202                                     &child2_allocation);
1203           gtk_paned_child_allocate (priv->child1,
1204                                     priv->child1_window,
1205                                     &window1_allocation,
1206                                     &child1_allocation);
1207         }
1208       else
1209         {
1210           gtk_paned_child_allocate (priv->child1,
1211                                     priv->child1_window,
1212                                     &window1_allocation,
1213                                     &child1_allocation);
1214           gtk_paned_child_allocate (priv->child2,
1215                                     priv->child2_window,
1216                                     &window2_allocation,
1217                                     &child2_allocation);
1218         }
1219     }
1220   else
1221     {
1222       GtkAllocation window_allocation, child_allocation;
1223
1224       if (gtk_widget_get_realized (widget))
1225         gdk_window_hide (priv->handle);
1226
1227       if (priv->child1)
1228         gtk_paned_set_child_visible (paned, 0, TRUE);
1229       if (priv->child2)
1230         gtk_paned_set_child_visible (paned, 1, TRUE);
1231
1232       window_allocation.x = allocation->x;
1233       window_allocation.y = allocation->y;
1234       window_allocation.width = allocation->width;
1235       window_allocation.height = allocation->height;
1236       child_allocation.x = child_allocation.y = 0;
1237       child_allocation.width = allocation->width;
1238       child_allocation.height = allocation->height;
1239
1240       if (priv->child1 && gtk_widget_get_visible (priv->child1))
1241         {
1242           gtk_paned_child_allocate (priv->child1,
1243                                     priv->child1_window,
1244                                     &window_allocation,
1245                                     &child_allocation);
1246         }
1247       else if (priv->child2 && gtk_widget_get_visible (priv->child2))
1248         {
1249           gtk_paned_child_allocate (priv->child2,
1250                                     priv->child2_window,
1251                                     &window_allocation,
1252                                     &child_allocation);
1253         }
1254     }
1255 }
1256
1257 static GdkWindow *
1258 gtk_paned_create_child_window (GtkPaned  *paned,
1259                                GtkWidget *child) /* may be NULL */
1260 {
1261   GtkWidget *widget = GTK_WIDGET (paned);
1262   GtkPanedPrivate *priv = paned->priv;
1263   GdkWindow *window;
1264   GdkWindowAttr attributes;
1265   gint attributes_mask;
1266
1267   attributes.window_type = GDK_WINDOW_CHILD;
1268   attributes.wclass = GDK_INPUT_OUTPUT;
1269   attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
1270   if (child)
1271     {
1272       GtkAllocation allocation;
1273       int handle_size;
1274
1275       gtk_widget_style_get (widget, "handle-size", &handle_size, NULL);
1276
1277       gtk_widget_get_allocation (widget, &allocation);
1278       if (priv->orientation == GTK_ORIENTATION_HORIZONTAL &&
1279           child == priv->child2)
1280         attributes.x = priv->handle_pos.x + handle_size;
1281       else
1282         attributes.x = allocation.x;
1283       if (priv->orientation == GTK_ORIENTATION_VERTICAL &&
1284           child == priv->child2)
1285         attributes.y = priv->handle_pos.y + handle_size;
1286       else
1287         attributes.y = allocation.y;
1288
1289       gtk_widget_get_allocation (child, &allocation);
1290       attributes.width = allocation.width;
1291       attributes.height = allocation.height;
1292       attributes_mask = GDK_WA_X | GDK_WA_Y;
1293     }
1294   else
1295     {
1296       attributes.width = 1;
1297       attributes.height = 1;
1298       attributes_mask = 0;
1299     }
1300
1301   window = gdk_window_new (gtk_widget_get_window (widget),
1302                            &attributes, attributes_mask);
1303   gdk_window_set_user_data (window, paned);
1304   gtk_style_context_set_background (gtk_widget_get_style_context (widget), window);
1305
1306   if (child)
1307     gtk_widget_set_parent_window (child, window);
1308
1309   return window;
1310 }
1311
1312 static void
1313 gtk_paned_realize (GtkWidget *widget)
1314 {
1315   GtkPaned *paned = GTK_PANED (widget);
1316   GtkPanedPrivate *priv = paned->priv;
1317   GdkWindow *window;
1318   GdkWindowAttr attributes;
1319   gint attributes_mask;
1320
1321   gtk_widget_set_realized (widget, TRUE);
1322
1323   window = gtk_widget_get_parent_window (widget);
1324   gtk_widget_set_window (widget, window);
1325   g_object_ref (window);
1326
1327   attributes.window_type = GDK_WINDOW_CHILD;
1328   attributes.wclass = GDK_INPUT_ONLY;
1329   attributes.x = priv->handle_pos.x;
1330   attributes.y = priv->handle_pos.y;
1331   attributes.width = priv->handle_pos.width;
1332   attributes.height = priv->handle_pos.height;
1333   attributes.event_mask = gtk_widget_get_events (widget);
1334   attributes.event_mask |= (GDK_BUTTON_PRESS_MASK |
1335                             GDK_BUTTON_RELEASE_MASK |
1336                             GDK_ENTER_NOTIFY_MASK |
1337                             GDK_LEAVE_NOTIFY_MASK |
1338                             GDK_POINTER_MOTION_MASK |
1339                             GDK_POINTER_MOTION_HINT_MASK);
1340   attributes_mask = GDK_WA_X | GDK_WA_Y;
1341   if (gtk_widget_is_sensitive (widget))
1342     {
1343       attributes.cursor = gdk_cursor_new_for_display (gtk_widget_get_display (widget),
1344                                                       priv->cursor_type);
1345       attributes_mask |= GDK_WA_CURSOR;
1346     }
1347
1348   priv->handle = gdk_window_new (window,
1349                                  &attributes, attributes_mask);
1350   gdk_window_set_user_data (priv->handle, paned);
1351   if (attributes_mask & GDK_WA_CURSOR)
1352     g_object_unref (attributes.cursor);
1353
1354   priv->child1_window = gtk_paned_create_child_window (paned, priv->child1);
1355   priv->child2_window = gtk_paned_create_child_window (paned, priv->child2);
1356 }
1357
1358 static void
1359 gtk_paned_unrealize (GtkWidget *widget)
1360 {
1361   GtkPaned *paned = GTK_PANED (widget);
1362   GtkPanedPrivate *priv = paned->priv;
1363
1364   if (priv->child2)
1365     gtk_widget_set_parent_window (priv->child2, NULL);
1366   gdk_window_set_user_data (priv->child2_window, NULL);
1367   gdk_window_destroy (priv->child2_window);
1368   priv->child2_window = NULL;
1369
1370   if (priv->child1)
1371     gtk_widget_set_parent_window (priv->child1, NULL);
1372   gdk_window_set_user_data (priv->child1_window, NULL);
1373   gdk_window_destroy (priv->child1_window);
1374   priv->child1_window = NULL;
1375
1376   if (priv->handle)
1377     {
1378       gdk_window_set_user_data (priv->handle, NULL);
1379       gdk_window_destroy (priv->handle);
1380       priv->handle = NULL;
1381     }
1382
1383   gtk_paned_set_last_child1_focus (paned, NULL);
1384   gtk_paned_set_last_child2_focus (paned, NULL);
1385   gtk_paned_set_saved_focus (paned, NULL);
1386   gtk_paned_set_first_paned (paned, NULL);
1387
1388   GTK_WIDGET_CLASS (gtk_paned_parent_class)->unrealize (widget);
1389 }
1390
1391 static void
1392 gtk_paned_map (GtkWidget *widget)
1393 {
1394   GtkPaned *paned = GTK_PANED (widget);
1395   GtkPanedPrivate *priv = paned->priv;
1396
1397   if (priv->child1 && gtk_widget_get_visible (priv->child1) &&
1398       priv->child2 && gtk_widget_get_visible (priv->child2))
1399     gdk_window_show (priv->handle);
1400
1401   if (priv->child1 && gtk_widget_get_visible (priv->child1) && gtk_widget_get_child_visible (priv->child1))
1402     gdk_window_show (priv->child1_window);
1403   if (priv->child2 && gtk_widget_get_visible (priv->child2) && gtk_widget_get_child_visible (priv->child2))
1404     gdk_window_show (priv->child2_window);
1405
1406   GTK_WIDGET_CLASS (gtk_paned_parent_class)->map (widget);
1407 }
1408
1409 static void
1410 gtk_paned_unmap (GtkWidget *widget)
1411 {
1412   GtkPaned *paned = GTK_PANED (widget);
1413   GtkPanedPrivate *priv = paned->priv;
1414
1415   gdk_window_hide (priv->handle);
1416
1417   if (gdk_window_is_visible (priv->child1_window))
1418     gdk_window_hide (priv->child1_window);
1419   if (gdk_window_is_visible (priv->child2_window))
1420     gdk_window_hide (priv->child2_window);
1421
1422   GTK_WIDGET_CLASS (gtk_paned_parent_class)->unmap (widget);
1423 }
1424
1425 static gboolean
1426 gtk_paned_draw (GtkWidget *widget,
1427                 cairo_t   *cr)
1428 {
1429   GtkPaned *paned = GTK_PANED (widget);
1430   GtkPanedPrivate *priv = paned->priv;
1431
1432   if (gtk_cairo_should_draw_window (cr, priv->child1_window))
1433     {
1434       cairo_save (cr);
1435       gtk_cairo_transform_to_window (cr, widget, priv->child1_window);
1436       gtk_render_background (gtk_widget_get_style_context (widget),
1437                              cr,
1438                              0, 0,
1439                              gdk_window_get_width (priv->child1_window),
1440                              gdk_window_get_height (priv->child1_window));
1441       cairo_restore (cr);
1442     }
1443
1444   if (gtk_cairo_should_draw_window (cr, priv->child2_window))
1445     {
1446       cairo_save (cr);
1447       gtk_cairo_transform_to_window (cr, widget, priv->child2_window);
1448       gtk_render_background (gtk_widget_get_style_context (widget),
1449                              cr,
1450                              0, 0,
1451                              gdk_window_get_width (priv->child2_window),
1452                              gdk_window_get_height (priv->child2_window));
1453       cairo_restore (cr);
1454     }
1455
1456   if (gtk_cairo_should_draw_window (cr, gtk_widget_get_window (widget)) &&
1457       priv->child1 && gtk_widget_get_visible (priv->child1) &&
1458       priv->child2 && gtk_widget_get_visible (priv->child2))
1459     {
1460       GtkStyleContext *context;
1461       GtkStateFlags state;
1462       GtkAllocation allocation;
1463
1464       gtk_widget_get_allocation (widget, &allocation);
1465       context = gtk_widget_get_style_context (widget);
1466       state = gtk_widget_get_state_flags (widget);
1467
1468       if (gtk_widget_is_focus (widget))
1469         state |= GTK_STATE_FLAG_SELECTED;
1470       if (priv->handle_prelit)
1471         state |= GTK_STATE_FLAG_PRELIGHT;
1472
1473       gtk_style_context_save (context);
1474       gtk_style_context_set_state (context, state);
1475       gtk_style_context_add_class (context, GTK_STYLE_CLASS_PANE_SEPARATOR);
1476       gtk_render_handle (context, cr,
1477                          priv->handle_pos.x - allocation.x,
1478                          priv->handle_pos.y - allocation.y,
1479                          priv->handle_pos.width,
1480                          priv->handle_pos.height);
1481
1482       gtk_style_context_restore (context);
1483     }
1484
1485   /* Chain up to draw children */
1486   GTK_WIDGET_CLASS (gtk_paned_parent_class)->draw (widget, cr);
1487
1488   return FALSE;
1489 }
1490
1491 static gboolean
1492 is_rtl (GtkPaned *paned)
1493 {
1494   GtkPanedPrivate *priv = paned->priv;
1495
1496   if (priv->orientation == GTK_ORIENTATION_HORIZONTAL &&
1497       gtk_widget_get_direction (GTK_WIDGET (paned)) == GTK_TEXT_DIR_RTL)
1498     {
1499       return TRUE;
1500     }
1501
1502   return FALSE;
1503 }
1504
1505 static void
1506 update_drag (GtkPaned *paned)
1507 {
1508   GtkPanedPrivate *priv = paned->priv;
1509   GtkAllocation allocation;
1510   GtkWidget *widget = GTK_WIDGET (paned);
1511   gint pos;
1512   gint handle_size;
1513   gint size;
1514
1515   if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
1516     gtk_widget_get_pointer (widget, &pos, NULL);
1517   else
1518     gtk_widget_get_pointer (widget, NULL, &pos);
1519
1520   pos -= priv->drag_pos;
1521
1522   if (is_rtl (paned))
1523     {
1524       gtk_widget_style_get (widget,
1525                             "handle-size", &handle_size,
1526                             NULL);
1527
1528       gtk_widget_get_allocation (widget, &allocation);
1529       size = allocation.width - pos - handle_size;
1530     }
1531   else
1532     {
1533       size = pos;
1534     }
1535
1536   size = CLAMP (size, priv->min_position, priv->max_position);
1537
1538   if (size != priv->child1_size)
1539     gtk_paned_set_position (paned, size);
1540 }
1541
1542 static gboolean
1543 gtk_paned_enter (GtkWidget        *widget,
1544                  GdkEventCrossing *event)
1545 {
1546   GtkPaned *paned = GTK_PANED (widget);
1547   GtkPanedPrivate *priv = paned->priv;
1548
1549   if (priv->in_drag)
1550     update_drag (paned);
1551   else
1552     {
1553       priv->handle_prelit = TRUE;
1554       gtk_widget_queue_draw_area (widget,
1555                                   priv->handle_pos.x,
1556                                   priv->handle_pos.y,
1557                                   priv->handle_pos.width,
1558                                   priv->handle_pos.height);
1559     }
1560
1561   return TRUE;
1562 }
1563
1564 static gboolean
1565 gtk_paned_leave (GtkWidget        *widget,
1566                  GdkEventCrossing *event)
1567 {
1568   GtkPaned *paned = GTK_PANED (widget);
1569   GtkPanedPrivate *priv = paned->priv;
1570
1571   if (priv->in_drag)
1572     update_drag (paned);
1573   else
1574     {
1575       priv->handle_prelit = FALSE;
1576       gtk_widget_queue_draw_area (widget,
1577                                   priv->handle_pos.x,
1578                                   priv->handle_pos.y,
1579                                   priv->handle_pos.width,
1580                                   priv->handle_pos.height);
1581     }
1582
1583   return TRUE;
1584 }
1585
1586 static gboolean
1587 gtk_paned_focus (GtkWidget        *widget,
1588                  GtkDirectionType  direction)
1589
1590 {
1591   gboolean retval;
1592
1593   /* This is a hack, but how can this be done without
1594    * excessive cut-and-paste from gtkcontainer.c?
1595    */
1596
1597   gtk_widget_set_can_focus (widget, FALSE);
1598   retval = GTK_WIDGET_CLASS (gtk_paned_parent_class)->focus (widget, direction);
1599   gtk_widget_set_can_focus (widget, TRUE);
1600
1601   return retval;
1602 }
1603
1604 static gboolean
1605 gtk_paned_button_press (GtkWidget      *widget,
1606                         GdkEventButton *event)
1607 {
1608   GtkPaned *paned = GTK_PANED (widget);
1609   GtkPanedPrivate *priv = paned->priv;
1610
1611   if (!priv->in_drag &&
1612       (event->window == priv->handle) && (event->button == 1))
1613     {
1614       /* We need a server grab here, not gtk_grab_add(), since
1615        * we don't want to pass events on to the widget's children */
1616       if (gdk_device_grab (event->device,
1617                            priv->handle,
1618                            GDK_OWNERSHIP_WINDOW, FALSE,
1619                            GDK_POINTER_MOTION_HINT_MASK
1620                            | GDK_BUTTON1_MOTION_MASK
1621                            | GDK_BUTTON_RELEASE_MASK
1622                            | GDK_ENTER_NOTIFY_MASK
1623                            | GDK_LEAVE_NOTIFY_MASK,
1624                            NULL, event->time) != GDK_GRAB_SUCCESS)
1625         return FALSE;
1626
1627       priv->in_drag = TRUE;
1628       priv->grab_time = event->time;
1629       priv->grab_device = event->device;
1630
1631       if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
1632         priv->drag_pos = event->x;
1633       else
1634         priv->drag_pos = event->y;
1635
1636       return TRUE;
1637     }
1638
1639   return FALSE;
1640 }
1641
1642 static gboolean
1643 gtk_paned_grab_broken (GtkWidget          *widget,
1644                        GdkEventGrabBroken *event)
1645 {
1646   GtkPaned *paned = GTK_PANED (widget);
1647   GtkPanedPrivate *priv = paned->priv;
1648
1649   priv->in_drag = FALSE;
1650   priv->drag_pos = -1;
1651   priv->position_set = TRUE;
1652
1653   return TRUE;
1654 }
1655
1656 static void
1657 stop_drag (GtkPaned *paned)
1658 {
1659   GtkPanedPrivate *priv = paned->priv;
1660
1661   priv->in_drag = FALSE;
1662   priv->drag_pos = -1;
1663   priv->position_set = TRUE;
1664
1665   gdk_device_ungrab (priv->grab_device,
1666                      priv->grab_time);
1667   priv->grab_device = NULL;
1668 }
1669
1670 static void
1671 gtk_paned_grab_notify (GtkWidget *widget,
1672                        gboolean   was_grabbed)
1673 {
1674   GtkPaned *paned = GTK_PANED (widget);
1675   GtkPanedPrivate *priv = paned->priv;
1676   GdkDevice *grab_device;
1677
1678   grab_device = priv->grab_device;
1679
1680   if (priv->in_drag && grab_device &&
1681       gtk_widget_device_is_shadowed (widget, grab_device))
1682     stop_drag (paned);
1683 }
1684
1685 static void
1686 gtk_paned_state_flags_changed (GtkWidget     *widget,
1687                                GtkStateFlags  previous_state)
1688 {
1689   GtkPaned *paned = GTK_PANED (widget);
1690   GtkPanedPrivate *priv = paned->priv;
1691   GdkCursor *cursor;
1692
1693   if (gtk_widget_get_realized (widget))
1694     {
1695       if (gtk_widget_is_sensitive (widget))
1696         cursor = gdk_cursor_new_for_display (gtk_widget_get_display (widget),
1697                                              priv->cursor_type);
1698       else
1699         cursor = NULL;
1700
1701       gdk_window_set_cursor (priv->handle, cursor);
1702
1703       if (cursor)
1704         g_object_unref (cursor);
1705     }
1706 }
1707
1708 static gboolean
1709 gtk_paned_button_release (GtkWidget      *widget,
1710                           GdkEventButton *event)
1711 {
1712   GtkPaned *paned = GTK_PANED (widget);
1713   GtkPanedPrivate *priv = paned->priv;
1714
1715   if (priv->in_drag && (event->button == 1))
1716     {
1717       stop_drag (paned);
1718
1719       return TRUE;
1720     }
1721
1722   return FALSE;
1723 }
1724
1725 static gboolean
1726 gtk_paned_motion (GtkWidget      *widget,
1727                   GdkEventMotion *event)
1728 {
1729   GtkPaned *paned = GTK_PANED (widget);
1730   GtkPanedPrivate *priv = paned->priv;
1731
1732   if (priv->in_drag)
1733     {
1734       update_drag (paned);
1735       return TRUE;
1736     }
1737
1738   return FALSE;
1739 }
1740
1741 /**
1742  * gtk_paned_new:
1743  * @orientation: the paned's orientation.
1744  *
1745  * Creates a new #GtkPaned widget.
1746  *
1747  * Return value: a new #GtkPaned.
1748  *
1749  * Since: 3.0
1750  **/
1751 GtkWidget *
1752 gtk_paned_new (GtkOrientation orientation)
1753 {
1754   return g_object_new (GTK_TYPE_PANED,
1755                        "orientation", orientation,
1756                        NULL);
1757 }
1758
1759 /**
1760  * gtk_paned_add1:
1761  * @paned: a paned widget
1762  * @child: the child to add
1763  *
1764  * Adds a child to the top or left pane with default parameters. This is
1765  * equivalent to
1766  * <literal>gtk_paned_pack1 (paned, child, FALSE, TRUE)</literal>.
1767  */
1768 void
1769 gtk_paned_add1 (GtkPaned  *paned,
1770                 GtkWidget *widget)
1771 {
1772   gtk_paned_pack1 (paned, widget, FALSE, TRUE);
1773 }
1774
1775 /**
1776  * gtk_paned_add2:
1777  * @paned: a paned widget
1778  * @child: the child to add
1779  *
1780  * Adds a child to the bottom or right pane with default parameters. This
1781  * is equivalent to
1782  * <literal>gtk_paned_pack2 (paned, child, TRUE, TRUE)</literal>.
1783  */
1784 void
1785 gtk_paned_add2 (GtkPaned  *paned,
1786                 GtkWidget *widget)
1787 {
1788   gtk_paned_pack2 (paned, widget, TRUE, TRUE);
1789 }
1790
1791 /**
1792  * gtk_paned_pack1:
1793  * @paned: a paned widget
1794  * @child: the child to add
1795  * @resize: should this child expand when the paned widget is resized.
1796  * @shrink: can this child be made smaller than its requisition.
1797  *
1798  * Adds a child to the top or left pane.
1799  */
1800 void
1801 gtk_paned_pack1 (GtkPaned  *paned,
1802                  GtkWidget *child,
1803                  gboolean   resize,
1804                  gboolean   shrink)
1805 {
1806   GtkPanedPrivate *priv;
1807
1808   g_return_if_fail (GTK_IS_PANED (paned));
1809   g_return_if_fail (GTK_IS_WIDGET (child));
1810
1811   priv = paned->priv;
1812
1813   if (!priv->child1)
1814     {
1815       priv->child1 = child;
1816       priv->child1_resize = resize;
1817       priv->child1_shrink = shrink;
1818
1819       gtk_widget_set_parent_window (child, priv->child1_window);
1820       gtk_widget_set_parent (child, GTK_WIDGET (paned));
1821     }
1822 }
1823
1824 /**
1825  * gtk_paned_pack2:
1826  * @paned: a paned widget
1827  * @child: the child to add
1828  * @resize: should this child expand when the paned widget is resized.
1829  * @shrink: can this child be made smaller than its requisition.
1830  *
1831  * Adds a child to the bottom or right pane.
1832  */
1833 void
1834 gtk_paned_pack2 (GtkPaned  *paned,
1835                  GtkWidget *child,
1836                  gboolean   resize,
1837                  gboolean   shrink)
1838 {
1839   GtkPanedPrivate *priv;
1840
1841   g_return_if_fail (GTK_IS_PANED (paned));
1842   g_return_if_fail (GTK_IS_WIDGET (child));
1843
1844   priv = paned->priv;
1845
1846   if (!priv->child2)
1847     {
1848       priv->child2 = child;
1849       priv->child2_resize = resize;
1850       priv->child2_shrink = shrink;
1851
1852       gtk_widget_set_parent_window (child, priv->child2_window);
1853       gtk_widget_set_parent (child, GTK_WIDGET (paned));
1854     }
1855 }
1856
1857
1858 static void
1859 gtk_paned_add (GtkContainer *container,
1860                GtkWidget    *widget)
1861 {
1862   GtkPanedPrivate *priv;
1863   GtkPaned *paned;
1864
1865   g_return_if_fail (GTK_IS_PANED (container));
1866
1867   paned = GTK_PANED (container);
1868   priv = paned->priv;
1869
1870   if (!priv->child1)
1871     gtk_paned_add1 (paned, widget);
1872   else if (!priv->child2)
1873     gtk_paned_add2 (paned, widget);
1874   else
1875     g_warning ("GtkPaned cannot have more than 2 children\n");
1876 }
1877
1878 static void
1879 gtk_paned_remove (GtkContainer *container,
1880                   GtkWidget    *widget)
1881 {
1882   GtkPaned *paned = GTK_PANED (container);
1883   GtkPanedPrivate *priv = paned->priv;
1884   gboolean was_visible;
1885
1886   was_visible = gtk_widget_get_visible (widget);
1887
1888   if (priv->child1 == widget)
1889     {
1890       if (priv->child1_window && gdk_window_is_visible (priv->child1_window))
1891         gdk_window_hide (priv->child1_window);
1892
1893       gtk_widget_unparent (widget);
1894
1895       priv->child1 = NULL;
1896
1897       if (was_visible && gtk_widget_get_visible (GTK_WIDGET (container)))
1898         gtk_widget_queue_resize_no_redraw (GTK_WIDGET (container));
1899     }
1900   else if (priv->child2 == widget)
1901     {
1902       if (priv->child2_window && gdk_window_is_visible (priv->child2_window))
1903         gdk_window_hide (priv->child2_window);
1904
1905       gtk_widget_unparent (widget);
1906
1907       priv->child2 = NULL;
1908
1909       if (was_visible && gtk_widget_get_visible (GTK_WIDGET (container)))
1910         gtk_widget_queue_resize_no_redraw (GTK_WIDGET (container));
1911     }
1912 }
1913
1914 static void
1915 gtk_paned_forall (GtkContainer *container,
1916                   gboolean      include_internals,
1917                   GtkCallback   callback,
1918                   gpointer      callback_data)
1919 {
1920   GtkPanedPrivate *priv;
1921   GtkPaned *paned;
1922
1923   g_return_if_fail (callback != NULL);
1924
1925   paned = GTK_PANED (container);
1926   priv = paned->priv;
1927
1928   if (priv->child1)
1929     (*callback) (priv->child1, callback_data);
1930   if (priv->child2)
1931     (*callback) (priv->child2, callback_data);
1932 }
1933
1934 /**
1935  * gtk_paned_get_position:
1936  * @paned: a #GtkPaned widget
1937  *
1938  * Obtains the position of the divider between the two panes.
1939  *
1940  * Return value: position of the divider
1941  **/
1942 gint
1943 gtk_paned_get_position (GtkPaned  *paned)
1944 {
1945   g_return_val_if_fail (GTK_IS_PANED (paned), 0);
1946
1947   return paned->priv->child1_size;
1948 }
1949
1950 /**
1951  * gtk_paned_set_position:
1952  * @paned: a #GtkPaned widget
1953  * @position: pixel position of divider, a negative value means that the position
1954  *            is unset.
1955  *
1956  * Sets the position of the divider between the two panes.
1957  **/
1958 void
1959 gtk_paned_set_position (GtkPaned *paned,
1960                         gint      position)
1961 {
1962   GtkPanedPrivate *priv;
1963   GObject *object;
1964
1965   g_return_if_fail (GTK_IS_PANED (paned));
1966
1967   priv = paned->priv;
1968
1969   if (priv->child1_size == position)
1970     return;
1971
1972   object = G_OBJECT (paned);
1973
1974   if (position >= 0)
1975     {
1976       /* We don't clamp here - the assumption is that
1977        * if the total allocation changes at the same time
1978        * as the position, the position set is with reference
1979        * to the new total size. If only the position changes,
1980        * then clamping will occur in gtk_paned_calc_position()
1981        */
1982
1983       priv->child1_size = position;
1984       priv->position_set = TRUE;
1985     }
1986   else
1987     {
1988       priv->position_set = FALSE;
1989     }
1990
1991   g_object_freeze_notify (object);
1992   g_object_notify (object, "position");
1993   g_object_notify (object, "position-set");
1994   g_object_thaw_notify (object);
1995
1996   gtk_widget_queue_resize_no_redraw (GTK_WIDGET (paned));
1997
1998 #ifdef G_OS_WIN32
1999   /* Hacky work-around for bug #144269 */
2000   if (priv->child2 != NULL)
2001     {
2002       gtk_widget_queue_draw (priv->child2);
2003     }
2004 #endif
2005 }
2006
2007 /**
2008  * gtk_paned_get_child1:
2009  * @paned: a #GtkPaned widget
2010  *
2011  * Obtains the first child of the paned widget.
2012  *
2013  * Return value: (transfer none): first child, or %NULL if it is not set.
2014  *
2015  * Since: 2.4
2016  **/
2017 GtkWidget *
2018 gtk_paned_get_child1 (GtkPaned *paned)
2019 {
2020   g_return_val_if_fail (GTK_IS_PANED (paned), NULL);
2021
2022   return paned->priv->child1;
2023 }
2024
2025 /**
2026  * gtk_paned_get_child2:
2027  * @paned: a #GtkPaned widget
2028  *
2029  * Obtains the second child of the paned widget.
2030  *
2031  * Return value: (transfer none): second child, or %NULL if it is not set.
2032  *
2033  * Since: 2.4
2034  **/
2035 GtkWidget *
2036 gtk_paned_get_child2 (GtkPaned *paned)
2037 {
2038   g_return_val_if_fail (GTK_IS_PANED (paned), NULL);
2039
2040   return paned->priv->child2;
2041 }
2042
2043 static void
2044 gtk_paned_calc_position (GtkPaned *paned,
2045                          gint      allocation,
2046                          gint      child1_req,
2047                          gint      child2_req)
2048 {
2049   GtkPanedPrivate *priv = paned->priv;
2050   gint old_position;
2051   gint old_min_position;
2052   gint old_max_position;
2053
2054   old_position = priv->child1_size;
2055   old_min_position = priv->min_position;
2056   old_max_position = priv->max_position;
2057
2058   priv->min_position = priv->child1_shrink ? 0 : child1_req;
2059
2060   priv->max_position = allocation;
2061   if (!priv->child2_shrink)
2062     priv->max_position = MAX (1, priv->max_position - child2_req);
2063   priv->max_position = MAX (priv->min_position, priv->max_position);
2064
2065   if (!priv->position_set)
2066     {
2067       if (priv->child1_resize && !priv->child2_resize)
2068         priv->child1_size = MAX (0, allocation - child2_req);
2069       else if (!priv->child1_resize && priv->child2_resize)
2070         priv->child1_size = child1_req;
2071       else if (child1_req + child2_req != 0)
2072         priv->child1_size = allocation * ((gdouble)child1_req / (child1_req + child2_req)) + 0.5;
2073       else
2074         priv->child1_size = allocation * 0.5 + 0.5;
2075     }
2076   else
2077     {
2078       /* If the position was set before the initial allocation.
2079        * (priv->last_allocation <= 0) just clamp it and leave it.
2080        */
2081       if (priv->last_allocation > 0)
2082         {
2083           if (priv->child1_resize && !priv->child2_resize)
2084             priv->child1_size += allocation - priv->last_allocation;
2085           else if (!(!priv->child1_resize && priv->child2_resize))
2086             priv->child1_size = allocation * ((gdouble) priv->child1_size / (priv->last_allocation)) + 0.5;
2087         }
2088     }
2089
2090   priv->child1_size = CLAMP (priv->child1_size,
2091                               priv->min_position,
2092                               priv->max_position);
2093
2094   if (priv->child1)
2095     gtk_paned_set_child_visible (paned, 0, priv->child1_size != 0);
2096
2097   if (priv->child2)
2098     gtk_paned_set_child_visible (paned, 1, priv->child1_size != allocation);
2099
2100   g_object_freeze_notify (G_OBJECT (paned));
2101   if (priv->child1_size != old_position)
2102     g_object_notify (G_OBJECT (paned), "position");
2103   if (priv->min_position != old_min_position)
2104     g_object_notify (G_OBJECT (paned), "min-position");
2105   if (priv->max_position != old_max_position)
2106     g_object_notify (G_OBJECT (paned), "max-position");
2107   g_object_thaw_notify (G_OBJECT (paned));
2108
2109   priv->last_allocation = allocation;
2110 }
2111
2112 static void
2113 gtk_paned_set_saved_focus (GtkPaned *paned, GtkWidget *widget)
2114 {
2115   GtkPanedPrivate *priv = paned->priv;
2116
2117   if (priv->saved_focus)
2118     g_object_remove_weak_pointer (G_OBJECT (priv->saved_focus),
2119                                   (gpointer *)&(priv->saved_focus));
2120
2121   priv->saved_focus = widget;
2122
2123   if (priv->saved_focus)
2124     g_object_add_weak_pointer (G_OBJECT (priv->saved_focus),
2125                                (gpointer *)&(priv->saved_focus));
2126 }
2127
2128 static void
2129 gtk_paned_set_first_paned (GtkPaned *paned, GtkPaned *first_paned)
2130 {
2131   GtkPanedPrivate *priv = paned->priv;
2132
2133   if (priv->first_paned)
2134     g_object_remove_weak_pointer (G_OBJECT (priv->first_paned),
2135                                   (gpointer *)&(priv->first_paned));
2136
2137   priv->first_paned = first_paned;
2138
2139   if (priv->first_paned)
2140     g_object_add_weak_pointer (G_OBJECT (priv->first_paned),
2141                                (gpointer *)&(priv->first_paned));
2142 }
2143
2144 static void
2145 gtk_paned_set_last_child1_focus (GtkPaned *paned, GtkWidget *widget)
2146 {
2147   GtkPanedPrivate *priv = paned->priv;
2148
2149   if (priv->last_child1_focus)
2150     g_object_remove_weak_pointer (G_OBJECT (priv->last_child1_focus),
2151                                   (gpointer *)&(priv->last_child1_focus));
2152
2153   priv->last_child1_focus = widget;
2154
2155   if (priv->last_child1_focus)
2156     g_object_add_weak_pointer (G_OBJECT (priv->last_child1_focus),
2157                                (gpointer *)&(priv->last_child1_focus));
2158 }
2159
2160 static void
2161 gtk_paned_set_last_child2_focus (GtkPaned *paned, GtkWidget *widget)
2162 {
2163   GtkPanedPrivate *priv = paned->priv;
2164
2165   if (priv->last_child2_focus)
2166     g_object_remove_weak_pointer (G_OBJECT (priv->last_child2_focus),
2167                                   (gpointer *)&(priv->last_child2_focus));
2168
2169   priv->last_child2_focus = widget;
2170
2171   if (priv->last_child2_focus)
2172     g_object_add_weak_pointer (G_OBJECT (priv->last_child2_focus),
2173                                (gpointer *)&(priv->last_child2_focus));
2174 }
2175
2176 static GtkWidget *
2177 paned_get_focus_widget (GtkPaned *paned)
2178 {
2179   GtkWidget *toplevel;
2180
2181   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (paned));
2182   if (gtk_widget_is_toplevel (toplevel))
2183     return gtk_window_get_focus (GTK_WINDOW (toplevel));
2184
2185   return NULL;
2186 }
2187
2188 static void
2189 gtk_paned_set_focus_child (GtkContainer *container,
2190                            GtkWidget    *focus_child)
2191 {
2192   GtkPaned *paned;
2193   GtkPanedPrivate *priv;
2194   GtkWidget *container_focus_child;
2195
2196   g_return_if_fail (GTK_IS_PANED (container));
2197
2198   paned = GTK_PANED (container);
2199   priv = paned->priv;
2200
2201   if (focus_child == NULL)
2202     {
2203       GtkWidget *last_focus;
2204       GtkWidget *w;
2205
2206       last_focus = paned_get_focus_widget (paned);
2207
2208       if (last_focus)
2209         {
2210           /* If there is one or more paned widgets between us and the
2211            * focus widget, we want the topmost of those as last_focus
2212            */
2213           for (w = last_focus; w != GTK_WIDGET (paned); w = gtk_widget_get_parent (w))
2214             if (GTK_IS_PANED (w))
2215               last_focus = w;
2216
2217           container_focus_child = gtk_container_get_focus_child (container);
2218           if (container_focus_child == priv->child1)
2219             gtk_paned_set_last_child1_focus (paned, last_focus);
2220           else if (container_focus_child == priv->child2)
2221             gtk_paned_set_last_child2_focus (paned, last_focus);
2222         }
2223     }
2224
2225   if (GTK_CONTAINER_CLASS (gtk_paned_parent_class)->set_focus_child)
2226     GTK_CONTAINER_CLASS (gtk_paned_parent_class)->set_focus_child (container, focus_child);
2227 }
2228
2229 static void
2230 gtk_paned_get_cycle_chain (GtkPaned          *paned,
2231                            GtkDirectionType   direction,
2232                            GList            **widgets)
2233 {
2234   GtkPanedPrivate *priv = paned->priv;
2235   GtkContainer *container = GTK_CONTAINER (paned);
2236   GtkWidget *ancestor = NULL;
2237   GtkWidget *focus_child;
2238   GtkWidget *parent;
2239   GtkWidget *widget = GTK_WIDGET (paned);
2240   GList *temp_list = NULL;
2241   GList *list;
2242
2243   if (priv->in_recursion)
2244     return;
2245
2246   g_assert (widgets != NULL);
2247
2248   if (priv->last_child1_focus &&
2249       !gtk_widget_is_ancestor (priv->last_child1_focus, widget))
2250     {
2251       gtk_paned_set_last_child1_focus (paned, NULL);
2252     }
2253
2254   if (priv->last_child2_focus &&
2255       !gtk_widget_is_ancestor (priv->last_child2_focus, widget))
2256     {
2257       gtk_paned_set_last_child2_focus (paned, NULL);
2258     }
2259
2260   parent = gtk_widget_get_parent (widget);
2261   if (parent)
2262     ancestor = gtk_widget_get_ancestor (parent, GTK_TYPE_PANED);
2263
2264   /* The idea here is that temp_list is a list of widgets we want to cycle
2265    * to. The list is prioritized so that the first element is our first
2266    * choice, the next our second, and so on.
2267    *
2268    * We can't just use g_list_reverse(), because we want to try
2269    * priv->last_child?_focus before priv->child?, both when we
2270    * are going forward and backward.
2271    */
2272   focus_child = gtk_container_get_focus_child (container);
2273   if (direction == GTK_DIR_TAB_FORWARD)
2274     {
2275       if (focus_child == priv->child1)
2276         {
2277           temp_list = g_list_append (temp_list, priv->last_child2_focus);
2278           temp_list = g_list_append (temp_list, priv->child2);
2279           temp_list = g_list_append (temp_list, ancestor);
2280         }
2281       else if (focus_child == priv->child2)
2282         {
2283           temp_list = g_list_append (temp_list, ancestor);
2284           temp_list = g_list_append (temp_list, priv->last_child1_focus);
2285           temp_list = g_list_append (temp_list, priv->child1);
2286         }
2287       else
2288         {
2289           temp_list = g_list_append (temp_list, priv->last_child1_focus);
2290           temp_list = g_list_append (temp_list, priv->child1);
2291           temp_list = g_list_append (temp_list, priv->last_child2_focus);
2292           temp_list = g_list_append (temp_list, priv->child2);
2293           temp_list = g_list_append (temp_list, ancestor);
2294         }
2295     }
2296   else
2297     {
2298       if (focus_child == priv->child1)
2299         {
2300           temp_list = g_list_append (temp_list, ancestor);
2301           temp_list = g_list_append (temp_list, priv->last_child2_focus);
2302           temp_list = g_list_append (temp_list, priv->child2);
2303         }
2304       else if (focus_child == priv->child2)
2305         {
2306           temp_list = g_list_append (temp_list, priv->last_child1_focus);
2307           temp_list = g_list_append (temp_list, priv->child1);
2308           temp_list = g_list_append (temp_list, ancestor);
2309         }
2310       else
2311         {
2312           temp_list = g_list_append (temp_list, priv->last_child2_focus);
2313           temp_list = g_list_append (temp_list, priv->child2);
2314           temp_list = g_list_append (temp_list, priv->last_child1_focus);
2315           temp_list = g_list_append (temp_list, priv->child1);
2316           temp_list = g_list_append (temp_list, ancestor);
2317         }
2318     }
2319
2320   /* Walk the list and expand all the paned widgets. */
2321   for (list = temp_list; list != NULL; list = list->next)
2322     {
2323       GtkWidget *widget = list->data;
2324
2325       if (widget)
2326         {
2327           if (GTK_IS_PANED (widget))
2328             {
2329               priv->in_recursion = TRUE;
2330               gtk_paned_get_cycle_chain (GTK_PANED (widget), direction, widgets);
2331               priv->in_recursion = FALSE;
2332             }
2333           else
2334             {
2335               *widgets = g_list_append (*widgets, widget);
2336             }
2337         }
2338     }
2339
2340   g_list_free (temp_list);
2341 }
2342
2343 static gboolean
2344 gtk_paned_cycle_child_focus (GtkPaned *paned,
2345                              gboolean  reversed)
2346 {
2347   GList *cycle_chain = NULL;
2348   GList *list;
2349
2350   GtkDirectionType direction = reversed? GTK_DIR_TAB_BACKWARD : GTK_DIR_TAB_FORWARD;
2351
2352   /* ignore f6 if the handle is focused */
2353   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
2354     return TRUE;
2355
2356   /* we can't just let the event propagate up the hierarchy,
2357    * because the paned will want to cycle focus _unless_ an
2358    * ancestor paned handles the event
2359    */
2360   gtk_paned_get_cycle_chain (paned, direction, &cycle_chain);
2361
2362   for (list = cycle_chain; list != NULL; list = list->next)
2363     if (gtk_widget_child_focus (GTK_WIDGET (list->data), direction))
2364       break;
2365
2366   g_list_free (cycle_chain);
2367
2368   return TRUE;
2369 }
2370
2371 static void
2372 get_child_panes (GtkWidget  *widget,
2373                  GList     **panes)
2374 {
2375   if (!widget || !gtk_widget_get_realized (widget))
2376     return;
2377
2378   if (GTK_IS_PANED (widget))
2379     {
2380       GtkPaned *paned = GTK_PANED (widget);
2381       GtkPanedPrivate *priv = paned->priv;
2382
2383       get_child_panes (priv->child1, panes);
2384       *panes = g_list_prepend (*panes, widget);
2385       get_child_panes (priv->child2, panes);
2386     }
2387   else if (GTK_IS_CONTAINER (widget))
2388     {
2389       gtk_container_forall (GTK_CONTAINER (widget),
2390                             (GtkCallback)get_child_panes, panes);
2391     }
2392 }
2393
2394 static GList *
2395 get_all_panes (GtkPaned *paned)
2396 {
2397   GtkPaned *topmost = NULL;
2398   GList *result = NULL;
2399   GtkWidget *w;
2400
2401   for (w = GTK_WIDGET (paned); w != NULL; w = gtk_widget_get_parent (w))
2402     {
2403       if (GTK_IS_PANED (w))
2404         topmost = GTK_PANED (w);
2405     }
2406
2407   g_assert (topmost);
2408
2409   get_child_panes (GTK_WIDGET (topmost), &result);
2410
2411   return g_list_reverse (result);
2412 }
2413
2414 static void
2415 gtk_paned_find_neighbours (GtkPaned  *paned,
2416                            GtkPaned **next,
2417                            GtkPaned **prev)
2418 {
2419   GList *all_panes;
2420   GList *this_link;
2421
2422   all_panes = get_all_panes (paned);
2423   g_assert (all_panes);
2424
2425   this_link = g_list_find (all_panes, paned);
2426
2427   g_assert (this_link);
2428
2429   if (this_link->next)
2430     *next = this_link->next->data;
2431   else
2432     *next = all_panes->data;
2433
2434   if (this_link->prev)
2435     *prev = this_link->prev->data;
2436   else
2437     *prev = g_list_last (all_panes)->data;
2438
2439   g_list_free (all_panes);
2440 }
2441
2442 static gboolean
2443 gtk_paned_move_handle (GtkPaned      *paned,
2444                        GtkScrollType  scroll)
2445 {
2446   GtkPanedPrivate *priv = paned->priv;
2447
2448   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
2449     {
2450       gint old_position;
2451       gint new_position;
2452       gint increment;
2453
2454       enum {
2455         SINGLE_STEP_SIZE = 1,
2456         PAGE_STEP_SIZE   = 75
2457       };
2458
2459       new_position = old_position = gtk_paned_get_position (paned);
2460       increment = 0;
2461
2462       switch (scroll)
2463         {
2464         case GTK_SCROLL_STEP_LEFT:
2465         case GTK_SCROLL_STEP_UP:
2466         case GTK_SCROLL_STEP_BACKWARD:
2467           increment = - SINGLE_STEP_SIZE;
2468           break;
2469
2470         case GTK_SCROLL_STEP_RIGHT:
2471         case GTK_SCROLL_STEP_DOWN:
2472         case GTK_SCROLL_STEP_FORWARD:
2473           increment = SINGLE_STEP_SIZE;
2474           break;
2475
2476         case GTK_SCROLL_PAGE_LEFT:
2477         case GTK_SCROLL_PAGE_UP:
2478         case GTK_SCROLL_PAGE_BACKWARD:
2479           increment = - PAGE_STEP_SIZE;
2480           break;
2481
2482         case GTK_SCROLL_PAGE_RIGHT:
2483         case GTK_SCROLL_PAGE_DOWN:
2484         case GTK_SCROLL_PAGE_FORWARD:
2485           increment = PAGE_STEP_SIZE;
2486           break;
2487
2488         case GTK_SCROLL_START:
2489           new_position = priv->min_position;
2490           break;
2491
2492         case GTK_SCROLL_END:
2493           new_position = priv->max_position;
2494           break;
2495
2496         default:
2497           break;
2498         }
2499
2500       if (increment)
2501         {
2502           if (is_rtl (paned))
2503             increment = -increment;
2504
2505           new_position = old_position + increment;
2506         }
2507
2508       new_position = CLAMP (new_position, priv->min_position, priv->max_position);
2509
2510       if (old_position != new_position)
2511         gtk_paned_set_position (paned, new_position);
2512
2513       return TRUE;
2514     }
2515
2516   return FALSE;
2517 }
2518
2519 static void
2520 gtk_paned_restore_focus (GtkPaned *paned)
2521 {
2522   GtkPanedPrivate *priv = paned->priv;
2523
2524   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
2525     {
2526       if (priv->saved_focus &&
2527           gtk_widget_get_sensitive (priv->saved_focus))
2528         {
2529           gtk_widget_grab_focus (priv->saved_focus);
2530         }
2531       else
2532         {
2533           /* the saved focus is somehow not available for focusing,
2534            * try
2535            *   1) tabbing into the paned widget
2536            * if that didn't work,
2537            *   2) unset focus for the window if there is one
2538            */
2539
2540           if (!gtk_widget_child_focus (GTK_WIDGET (paned), GTK_DIR_TAB_FORWARD))
2541             {
2542               GtkWidget *toplevel = gtk_widget_get_toplevel (GTK_WIDGET (paned));
2543
2544               if (GTK_IS_WINDOW (toplevel))
2545                 gtk_window_set_focus (GTK_WINDOW (toplevel), NULL);
2546             }
2547         }
2548
2549       gtk_paned_set_saved_focus (paned, NULL);
2550       gtk_paned_set_first_paned (paned, NULL);
2551     }
2552 }
2553
2554 static gboolean
2555 gtk_paned_accept_position (GtkPaned *paned)
2556 {
2557   GtkPanedPrivate *priv = paned->priv;
2558
2559   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
2560     {
2561       priv->original_position = -1;
2562       gtk_paned_restore_focus (paned);
2563
2564       return TRUE;
2565     }
2566
2567   return FALSE;
2568 }
2569
2570
2571 static gboolean
2572 gtk_paned_cancel_position (GtkPaned *paned)
2573 {
2574   GtkPanedPrivate *priv = paned->priv;
2575
2576   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
2577     {
2578       if (priv->original_position != -1)
2579         {
2580           gtk_paned_set_position (paned, priv->original_position);
2581           priv->original_position = -1;
2582         }
2583
2584       gtk_paned_restore_focus (paned);
2585       return TRUE;
2586     }
2587
2588   return FALSE;
2589 }
2590
2591 static gboolean
2592 gtk_paned_cycle_handle_focus (GtkPaned *paned,
2593                               gboolean  reversed)
2594 {
2595   GtkPanedPrivate *priv = paned->priv;
2596   GtkPaned *next, *prev;
2597
2598   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
2599     {
2600       GtkPaned *focus = NULL;
2601
2602       if (!priv->first_paned)
2603         {
2604           /* The first_pane has disappeared. As an ad-hoc solution,
2605            * we make the currently focused paned the first_paned. To the
2606            * user this will seem like the paned cycling has been reset.
2607            */
2608
2609           gtk_paned_set_first_paned (paned, paned);
2610         }
2611
2612       gtk_paned_find_neighbours (paned, &next, &prev);
2613
2614       if (reversed && prev &&
2615           prev != paned && paned != priv->first_paned)
2616         {
2617           focus = prev;
2618         }
2619       else if (!reversed && next &&
2620                next != paned && next != priv->first_paned)
2621         {
2622           focus = next;
2623         }
2624       else
2625         {
2626           gtk_paned_accept_position (paned);
2627           return TRUE;
2628         }
2629
2630       g_assert (focus);
2631
2632       gtk_paned_set_saved_focus (focus, priv->saved_focus);
2633       gtk_paned_set_first_paned (focus, priv->first_paned);
2634
2635       gtk_paned_set_saved_focus (paned, NULL);
2636       gtk_paned_set_first_paned (paned, NULL);
2637
2638       gtk_widget_grab_focus (GTK_WIDGET (focus));
2639
2640       if (!gtk_widget_is_focus (GTK_WIDGET (paned)))
2641         {
2642           priv->original_position = -1;
2643           focus->priv->original_position = gtk_paned_get_position (focus);
2644         }
2645     }
2646   else
2647     {
2648       GtkContainer *container = GTK_CONTAINER (paned);
2649       GtkPaned *focus;
2650       GtkPaned *first;
2651       GtkPaned *prev, *next;
2652       GtkWidget *toplevel;
2653       GtkWidget *focus_child;
2654
2655       gtk_paned_find_neighbours (paned, &next, &prev);
2656       focus_child = gtk_container_get_focus_child (container);
2657
2658       if (focus_child == priv->child1)
2659         {
2660           if (reversed)
2661             {
2662               focus = prev;
2663               first = paned;
2664             }
2665           else
2666             {
2667               focus = paned;
2668               first = paned;
2669             }
2670         }
2671       else if (focus_child == priv->child2)
2672         {
2673           if (reversed)
2674             {
2675               focus = paned;
2676               first = next;
2677             }
2678           else
2679             {
2680               focus = next;
2681               first = next;
2682             }
2683         }
2684       else
2685         {
2686           /* Focus is not inside this paned, and we don't have focus.
2687            * Presumably this happened because the application wants us
2688            * to start keyboard navigating.
2689            */
2690           focus = paned;
2691
2692           if (reversed)
2693             first = paned;
2694           else
2695             first = next;
2696         }
2697
2698       toplevel = gtk_widget_get_toplevel (GTK_WIDGET (paned));
2699
2700       if (GTK_IS_WINDOW (toplevel))
2701         gtk_paned_set_saved_focus (focus, gtk_window_get_focus (GTK_WINDOW (toplevel)));
2702       gtk_paned_set_first_paned (focus, first);
2703       focus->priv->original_position = gtk_paned_get_position (focus);
2704
2705       gtk_widget_grab_focus (GTK_WIDGET (focus));
2706    }
2707
2708   return TRUE;
2709 }
2710
2711 static gboolean
2712 gtk_paned_toggle_handle_focus (GtkPaned *paned)
2713 {
2714   /* This function/signal has the wrong name. It is called when you
2715    * press Tab or Shift-Tab and what we do is act as if
2716    * the user pressed Return and then Tab or Shift-Tab
2717    */
2718   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
2719     gtk_paned_accept_position (paned);
2720
2721   return FALSE;
2722 }
2723
2724 /**
2725  * gtk_paned_get_handle_window:
2726  * @paned: a #GtkPaned
2727  *
2728  * Returns the #GdkWindow of the handle. This function is
2729  * useful when handling button or motion events because it
2730  * enables the callback to distinguish between the window
2731  * of the paned, a child and the handle.
2732  *
2733  * Return value: (transfer none): the paned's handle window.
2734  *
2735  * Since: 2.20
2736  **/
2737 GdkWindow *
2738 gtk_paned_get_handle_window (GtkPaned *paned)
2739 {
2740   g_return_val_if_fail (GTK_IS_PANED (paned), NULL);
2741
2742   return paned->priv->handle;
2743 }