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 struct _GtkPanedPrivate
  93 {
  94   GtkPaned       *first_paned;
  95   GtkWidget      *child1;
  96   GtkWidget      *child2;
  97   GtkWidget      *last_child1_focus;
  98   GtkWidget      *last_child2_focus;
  99   GtkWidget      *saved_focus;
 100   GtkOrientation  orientation;
 101
 102   GdkCursorType  cursor_type;
 103   GdkDevice     *grab_device;
 104   GdkRectangle   handle_pos;
 105   GdkWindow     *handle;
 106
 107   gint          child1_size;
 108   gint          drag_pos;
 109   gint          last_allocation;
 110   gint          max_position;
 111   gint          min_position;
 112   gint          original_position;
 113
 114   guint32       grab_time;
 115
 116   guint         handle_prelit : 1;
 117   guint         in_drag       : 1;
 118   guint         in_recursion  : 1;
 119   guint         child1_resize : 1;
 120   guint         child1_shrink : 1;
 121   guint         child2_resize : 1;
 122   guint         child2_shrink : 1;
 123   guint         position_set  : 1;
 124 };
 125
 126 enum {
 127   PROP_0,
 128   PROP_ORIENTATION,
 129   PROP_POSITION,
 130   PROP_POSITION_SET,
 131   PROP_MIN_POSITION,
 132   PROP_MAX_POSITION
 133 };
 134
 135 enum {
 136   CHILD_PROP_0,
 137   CHILD_PROP_RESIZE,
 138   CHILD_PROP_SHRINK
 139 };
 140
 141 enum {
 142   CYCLE_CHILD_FOCUS,
 143   TOGGLE_HANDLE_FOCUS,
 144   MOVE_HANDLE,
 145   CYCLE_HANDLE_FOCUS,
 146   ACCEPT_POSITION,
 147   CANCEL_POSITION,
 148   LAST_SIGNAL
 149 };
 150
 151 static void     gtk_paned_set_property          (GObject          *object,
 152                                                  guint             prop_id,
 153                                                  const GValue     *value,
 154                                                  GParamSpec       *pspec);
 155 static void     gtk_paned_get_property          (GObject          *object,
 156                                                  guint             prop_id,
 157                                                  GValue           *value,
 158                                                  GParamSpec       *pspec);
 159 static void     gtk_paned_set_child_property    (GtkContainer     *container,
 160                                                  GtkWidget        *child,
 161                                                  guint             property_id,
 162                                                  const GValue     *value,
 163                                                  GParamSpec       *pspec);
 164 static void     gtk_paned_get_child_property    (GtkContainer     *container,
 165                                                  GtkWidget        *child,
 166                                                  guint             property_id,
 167                                                  GValue           *value,
 168                                                  GParamSpec       *pspec);
 169 static void     gtk_paned_finalize              (GObject          *object);
 170
 171 static void     gtk_paned_get_preferred_width   (GtkWidget        *widget,
 172                                                  gint             *minimum,
 173                                                  gint             *natural);
 174 static void     gtk_paned_get_preferred_height  (GtkWidget        *widget,
 175                                                  gint             *minimum,
 176                                                  gint             *natural);
 177
 178 static void     gtk_paned_size_allocate         (GtkWidget        *widget,
 179                                                  GtkAllocation    *allocation);
 180 static void     gtk_paned_realize               (GtkWidget        *widget);
 181 static void     gtk_paned_unrealize             (GtkWidget        *widget);
 182 static void     gtk_paned_map                   (GtkWidget        *widget);
 183 static void     gtk_paned_unmap                 (GtkWidget        *widget);
 184 static void     gtk_paned_state_flags_changed   (GtkWidget        *widget,
 185                                                  GtkStateFlags     previous_state);
 186 static gboolean gtk_paned_draw                  (GtkWidget        *widget,
 187                                                  cairo_t          *cr);
 188 static gboolean gtk_paned_enter                 (GtkWidget        *widget,
 189                                                  GdkEventCrossing *event);
 190 static gboolean gtk_paned_leave                 (GtkWidget        *widget,
 191                                                  GdkEventCrossing *event);
 192 static gboolean gtk_paned_button_press          (GtkWidget        *widget,
 193                                                  GdkEventButton   *event);
 194 static gboolean gtk_paned_button_release        (GtkWidget        *widget,
 195                                                  GdkEventButton   *event);
 196 static gboolean gtk_paned_motion                (GtkWidget        *widget,
 197                                                  GdkEventMotion   *event);
 198 static gboolean gtk_paned_focus                 (GtkWidget        *widget,
 199                                                  GtkDirectionType  direction);
 200 static gboolean gtk_paned_grab_broken           (GtkWidget          *widget,
 201                                                  GdkEventGrabBroken *event);
 202 static void     gtk_paned_add                   (GtkContainer     *container,
 203                                                  GtkWidget        *widget);
 204 static void     gtk_paned_remove                (GtkContainer     *container,
 205                                                  GtkWidget        *widget);
 206 static void     gtk_paned_forall                (GtkContainer     *container,
 207                                                  gboolean          include_internals,
 208                                                  GtkCallback       callback,
 209                                                  gpointer          callback_data);
 210 static void     gtk_paned_calc_position         (GtkPaned         *paned,
 211                                                  gint              allocation,
 212                                                  gint              child1_req,
 213                                                  gint              child2_req);
 214 static void     gtk_paned_set_focus_child       (GtkContainer     *container,
 215                                                  GtkWidget        *child);
 216 static void     gtk_paned_set_saved_focus       (GtkPaned         *paned,
 217                                                  GtkWidget        *widget);
 218 static void     gtk_paned_set_first_paned       (GtkPaned         *paned,
 219                                                  GtkPaned         *first_paned);
 220 static void     gtk_paned_set_last_child1_focus (GtkPaned         *paned,
 221                                                  GtkWidget        *widget);
 222 static void     gtk_paned_set_last_child2_focus (GtkPaned         *paned,
 223                                                  GtkWidget        *widget);
 224 static gboolean gtk_paned_cycle_child_focus     (GtkPaned         *paned,
 225                                                  gboolean          reverse);
 226 static gboolean gtk_paned_cycle_handle_focus    (GtkPaned         *paned,
 227                                                  gboolean          reverse);
 228 static gboolean gtk_paned_move_handle           (GtkPaned         *paned,
 229                                                  GtkScrollType     scroll);
 230 static gboolean gtk_paned_accept_position       (GtkPaned         *paned);
 231 static gboolean gtk_paned_cancel_position       (GtkPaned         *paned);
 232 static gboolean gtk_paned_toggle_handle_focus   (GtkPaned         *paned);
 233
 234 static GType    gtk_paned_child_type            (GtkContainer     *container);
 235 static void     gtk_paned_grab_notify           (GtkWidget        *widget,
 236                                                  gboolean          was_grabbed);
 237
 238
 239 G_DEFINE_TYPE_WITH_CODE (GtkPaned, gtk_paned, GTK_TYPE_CONTAINER,
 240                          G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE,
 241                                                 NULL))
 242
 243 static guint signals[LAST_SIGNAL] = { 0 };
 244
 245
 246 static void
 247 add_tab_bindings (GtkBindingSet    *binding_set,
 248                   GdkModifierType   modifiers)
 249 {
 250   gtk_binding_entry_add_signal (binding_set, GDK_KEY_Tab, modifiers,
 251                                 "toggle-handle-focus", 0);
 252   gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Tab, modifiers,
 253                                 "toggle-handle-focus", 0);
 254 }
 255
 256 static void
 257 add_move_binding (GtkBindingSet   *binding_set,
 258                   guint            keyval,
 259                   GdkModifierType  mask,
 260                   GtkScrollType    scroll)
 261 {
 262   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 263                                 "move-handle", 1,
 264                                 GTK_TYPE_SCROLL_TYPE, scroll);
 265 }
 266
 267 static void
 268 gtk_paned_class_init (GtkPanedClass *class)
 269 {
 270   GObjectClass *object_class;
 271   GtkWidgetClass *widget_class;
 272   GtkContainerClass *container_class;
 273   GtkPanedClass *paned_class;
 274   GtkBindingSet *binding_set;
 275
 276   object_class = (GObjectClass *) class;
 277   widget_class = (GtkWidgetClass *) class;
 278   container_class = (GtkContainerClass *) class;
 279   paned_class = (GtkPanedClass *) class;
 280
 281   object_class->set_property = gtk_paned_set_property;
 282   object_class->get_property = gtk_paned_get_property;
 283   object_class->finalize = gtk_paned_finalize;
 284
 285   widget_class->get_preferred_width = gtk_paned_get_preferred_width;
 286   widget_class->get_preferred_height = gtk_paned_get_preferred_height;
 287   widget_class->size_allocate = gtk_paned_size_allocate;
 288   widget_class->realize = gtk_paned_realize;
 289   widget_class->unrealize = gtk_paned_unrealize;
 290   widget_class->map = gtk_paned_map;
 291   widget_class->unmap = gtk_paned_unmap;
 292   widget_class->draw = gtk_paned_draw;
 293   widget_class->focus = gtk_paned_focus;
 294   widget_class->enter_notify_event = gtk_paned_enter;
 295   widget_class->leave_notify_event = gtk_paned_leave;
 296   widget_class->button_press_event = gtk_paned_button_press;
 297   widget_class->button_release_event = gtk_paned_button_release;
 298   widget_class->motion_notify_event = gtk_paned_motion;
 299   widget_class->grab_broken_event = gtk_paned_grab_broken;
 300   widget_class->grab_notify = gtk_paned_grab_notify;
 301   widget_class->state_flags_changed = gtk_paned_state_flags_changed;
 302
 303   container_class->add = gtk_paned_add;
 304   container_class->remove = gtk_paned_remove;
 305   container_class->forall = gtk_paned_forall;
 306   container_class->child_type = gtk_paned_child_type;
 307   container_class->set_focus_child = gtk_paned_set_focus_child;
 308   container_class->set_child_property = gtk_paned_set_child_property;
 309   container_class->get_child_property = gtk_paned_get_child_property;
 310   gtk_container_class_handle_border_width (container_class);
 311
 312   paned_class->cycle_child_focus = gtk_paned_cycle_child_focus;
 313   paned_class->toggle_handle_focus = gtk_paned_toggle_handle_focus;
 314   paned_class->move_handle = gtk_paned_move_handle;
 315   paned_class->cycle_handle_focus = gtk_paned_cycle_handle_focus;
 316   paned_class->accept_position = gtk_paned_accept_position;
 317   paned_class->cancel_position = gtk_paned_cancel_position;
 318
 319   g_object_class_override_property (object_class,
 320                                     PROP_ORIENTATION,
 321                                     "orientation");
 322
 323   g_object_class_install_property (object_class,
 324                                    PROP_POSITION,
 325                                    g_param_spec_int ("position",
 326                                                      P_("Position"),
 327                                                      P_("Position of paned separator in pixels (0 means all the way to the left/top)"),
 328                                                      0,
 329                                                      G_MAXINT,
 330                                                      0,
 331                                                      GTK_PARAM_READWRITE));
 332
 333   g_object_class_install_property (object_class,
 334                                    PROP_POSITION_SET,
 335                                    g_param_spec_boolean ("position-set",
 336                                                          P_("Position Set"),
 337                                                          P_("TRUE if the Position property should be used"),
 338                                                          FALSE,
 339                                                          GTK_PARAM_READWRITE));
 340
 341   gtk_widget_class_install_style_property (widget_class,
 342                                            g_param_spec_int ("handle-size",
 343                                                              P_("Handle Size"),
 344                                                              P_("Width of handle"),
 345                                                              0,
 346                                                              G_MAXINT,
 347                                                              5,
 348                                                              GTK_PARAM_READABLE));
 349   /**
 350    * GtkPaned:min-position:
 351    *
 352    * The smallest possible value for the position property. This property is derived from the
 353    * size and shrinkability of the widget's children.
 354    *
 355    * Since: 2.4
 356    */
 357   g_object_class_install_property (object_class,
 358                                    PROP_MIN_POSITION,
 359                                    g_param_spec_int ("min-position",
 360                                                      P_("Minimal Position"),
 361                                                      P_("Smallest possible value for the \"position\" property"),
 362                                                      0,
 363                                                      G_MAXINT,
 364                                                      0,
 365                                                      GTK_PARAM_READABLE));
 366
 367   /**
 368    * GtkPaned:max-position:
 369    *
 370    * The largest possible value for the position property. This property is derived from the
 371    * size and shrinkability of the widget's children.
 372    *
 373    * Since: 2.4
 374    */
 375   g_object_class_install_property (object_class,
 376                                    PROP_MAX_POSITION,
 377                                    g_param_spec_int ("max-position",
 378                                                      P_("Maximal Position"),
 379                                                      P_("Largest possible value for the \"position\" property"),
 380                                                      0,
 381                                                      G_MAXINT,
 382                                                      G_MAXINT,
 383                                                      GTK_PARAM_READABLE));
 384
 385   /**
 386    * GtkPaned:resize:
 387    *
 388    * The "resize" child property determines whether the child expands and
 389    * shrinks along with the paned widget.
 390    *
 391    * Since: 2.4
 392    */
 393   gtk_container_class_install_child_property (container_class,
 394                                               CHILD_PROP_RESIZE,
 395                                               g_param_spec_boolean ("resize",
 396                                                                     P_("Resize"),
 397                                                                     P_("If TRUE, the child expands and shrinks along with the paned widget"),
 398                                                                     TRUE,
 399                                                                     GTK_PARAM_READWRITE));
 400
 401   /**
 402    * GtkPaned:shrink:
 403    *
 404    * The "shrink" child property determines whether the child can be made
 405    * smaller than its requisition.
 406    *
 407    * Since: 2.4
 408    */
 409   gtk_container_class_install_child_property (container_class,
 410                                               CHILD_PROP_SHRINK,
 411                                               g_param_spec_boolean ("shrink",
 412                                                                     P_("Shrink"),
 413                                                                     P_("If TRUE, the child can be made smaller than its requisition"),
 414                                                                     TRUE,
 415                                                                     GTK_PARAM_READWRITE));
 416
 417   /**
 418    * GtkPaned::cycle-child-focus:
 419    * @widget: the object that received the signal
 420    * @reversed: whether cycling backward or forward
 421    *
 422    * The ::cycle-child-focus signal is a
 423    * <link linkend="keybinding-signals">keybinding signal</link>
 424    * which gets emitted to cycle the focus between the children of the paned.
 425    *
 426    * The default binding is f6.
 427    *
 428    * Since: 2.0
 429    */
 430   signals [CYCLE_CHILD_FOCUS] =
 431     g_signal_new (I_("cycle-child-focus"),
 432                   G_TYPE_FROM_CLASS (object_class),
 433                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 434                   G_STRUCT_OFFSET (GtkPanedClass, cycle_child_focus),
 435                   NULL, NULL,
 436                   _gtk_marshal_BOOLEAN__BOOLEAN,
 437                   G_TYPE_BOOLEAN, 1,
 438                   G_TYPE_BOOLEAN);
 439
 440   /**
 441    * GtkPaned::toggle-handle-focus:
 442    * @widget: the object that received the signal
 443    *
 444    * The ::toggle-handle-focus is a
 445    * <link linkend="keybinding-signals">keybinding signal</link>
 446    * which gets emitted to accept the current position of the handle and then
 447    * move focus to the next widget in the focus chain.
 448    *
 449    * The default binding is Tab.
 450    *
 451    * Since: 2.0
 452    */
 453   signals [TOGGLE_HANDLE_FOCUS] =
 454     g_signal_new (I_("toggle-handle-focus"),
 455                   G_TYPE_FROM_CLASS (object_class),
 456                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 457                   G_STRUCT_OFFSET (GtkPanedClass, toggle_handle_focus),
 458                   NULL, NULL,
 459                   _gtk_marshal_BOOLEAN__VOID,
 460                   G_TYPE_BOOLEAN, 0);
 461
 462   /**
 463    * GtkPaned::move-handle:
 464    * @widget: the object that received the signal
 465    * @scroll_type: a #GtkScrollType
 466    *
 467    * The ::move-handle signal is a
 468    * <link linkend="keybinding-signals">keybinding signal</link>
 469    * which gets emitted to move the handle when the user is using key bindings
 470    * to move it.
 471    *
 472    * Since: 2.0
 473    */
 474   signals[MOVE_HANDLE] =
 475     g_signal_new (I_("move-handle"),
 476                   G_TYPE_FROM_CLASS (object_class),
 477                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 478                   G_STRUCT_OFFSET (GtkPanedClass, move_handle),
 479                   NULL, NULL,
 480                   _gtk_marshal_BOOLEAN__ENUM,
 481                   G_TYPE_BOOLEAN, 1,
 482                   GTK_TYPE_SCROLL_TYPE);
 483
 484   /**
 485    * GtkPaned::cycle-handle-focus:
 486    * @widget: the object that received the signal
 487    * @reversed: whether cycling backward or forward
 488    *
 489    * The ::cycle-handle-focus signal is a
 490    * <link linkend="keybinding-signals">keybinding signal</link>
 491    * which gets emitted to cycle whether the paned should grab focus to allow
 492    * the user to change position of the handle by using key bindings.
 493    *
 494    * The default binding for this signal is f8.
 495    *
 496    * Since: 2.0
 497    */
 498   signals [CYCLE_HANDLE_FOCUS] =
 499     g_signal_new (I_("cycle-handle-focus"),
 500                   G_TYPE_FROM_CLASS (object_class),
 501                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 502                   G_STRUCT_OFFSET (GtkPanedClass, cycle_handle_focus),
 503                   NULL, NULL,
 504                   _gtk_marshal_BOOLEAN__BOOLEAN,
 505                   G_TYPE_BOOLEAN, 1,
 506                   G_TYPE_BOOLEAN);
 507
 508   /**
 509    * GtkPaned::accept-position:
 510    * @widget: the object that received the signal
 511    *
 512    * The ::accept-position signal is a
 513    * <link linkend="keybinding-signals">keybinding signal</link>
 514    * which gets emitted to accept the current position of the handle when
 515    * moving it using key bindings.
 516    *
 517    * The default binding for this signal is Return or Space.
 518    *
 519    * Since: 2.0
 520    */
 521   signals [ACCEPT_POSITION] =
 522     g_signal_new (I_("accept-position"),
 523                   G_TYPE_FROM_CLASS (object_class),
 524                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 525                   G_STRUCT_OFFSET (GtkPanedClass, accept_position),
 526                   NULL, NULL,
 527                   _gtk_marshal_BOOLEAN__VOID,
 528                   G_TYPE_BOOLEAN, 0);
 529
 530   /**
 531    * GtkPaned::cancel-position:
 532    * @widget: the object that received the signal
 533    *
 534    * The ::cancel-position signal is a
 535    * <link linkend="keybinding-signals">keybinding signal</link>
 536    * which gets emitted to cancel moving the position of the handle using key
 537    * bindings. The position of the handle will be reset to the value prior to
 538    * moving it.
 539    *
 540    * The default binding for this signal is Escape.
 541    *
 542    * Since: 2.0
 543    */
 544   signals [CANCEL_POSITION] =
 545     g_signal_new (I_("cancel-position"),
 546                   G_TYPE_FROM_CLASS (object_class),
 547                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 548                   G_STRUCT_OFFSET (GtkPanedClass, cancel_position),
 549                   NULL, NULL,
 550                   _gtk_marshal_BOOLEAN__VOID,
 551                   G_TYPE_BOOLEAN, 0);
 552
 553   binding_set = gtk_binding_set_by_class (class);
 554
 555   /* F6 and friends */
 556   gtk_binding_entry_add_signal (binding_set,
 557                                 GDK_KEY_F6, 0,
 558                                 "cycle-child-focus", 1,
 559                                 G_TYPE_BOOLEAN, FALSE);
 560   gtk_binding_entry_add_signal (binding_set,
 561                                 GDK_KEY_F6, GDK_SHIFT_MASK,
 562                                 "cycle-child-focus", 1,
 563                                 G_TYPE_BOOLEAN, TRUE);
 564
 565   /* F8 and friends */
 566   gtk_binding_entry_add_signal (binding_set,
 567                                 GDK_KEY_F8, 0,
 568                                 "cycle-handle-focus", 1,
 569                                 G_TYPE_BOOLEAN, FALSE);
 570
 571   gtk_binding_entry_add_signal (binding_set,
 572                                 GDK_KEY_F8, GDK_SHIFT_MASK,
 573                                 "cycle-handle-focus", 1,
 574                                 G_TYPE_BOOLEAN, TRUE);
 575
 576   add_tab_bindings (binding_set, 0);
 577   add_tab_bindings (binding_set, GDK_CONTROL_MASK);
 578   add_tab_bindings (binding_set, GDK_SHIFT_MASK);
 579   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK);
 580
 581   /* accept and cancel positions */
 582   gtk_binding_entry_add_signal (binding_set,
 583                                 GDK_KEY_Escape, 0,
 584                                 "cancel-position", 0);
 585
 586   gtk_binding_entry_add_signal (binding_set,
 587                                 GDK_KEY_Return, 0,
 588                                 "accept-position", 0);
 589   gtk_binding_entry_add_signal (binding_set,
 590                                 GDK_KEY_ISO_Enter, 0,
 591                                 "accept-position", 0);
 592   gtk_binding_entry_add_signal (binding_set,
 593                                 GDK_KEY_KP_Enter, 0,
 594                                 "accept-position", 0);
 595   gtk_binding_entry_add_signal (binding_set,
 596                                 GDK_KEY_space, 0,
 597                                 "accept-position", 0);
 598   gtk_binding_entry_add_signal (binding_set,
 599                                 GDK_KEY_KP_Space, 0,
 600                                 "accept-position", 0);
 601
 602   /* move handle */
 603   add_move_binding (binding_set, GDK_KEY_Left, 0, GTK_SCROLL_STEP_LEFT);
 604   add_move_binding (binding_set, GDK_KEY_KP_Left, 0, GTK_SCROLL_STEP_LEFT);
 605   add_move_binding (binding_set, GDK_KEY_Left, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_LEFT);
 606   add_move_binding (binding_set, GDK_KEY_KP_Left, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_LEFT);
 607
 608   add_move_binding (binding_set, GDK_KEY_Right, 0, GTK_SCROLL_STEP_RIGHT);
 609   add_move_binding (binding_set, GDK_KEY_Right, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_RIGHT);
 610   add_move_binding (binding_set, GDK_KEY_KP_Right, 0, GTK_SCROLL_STEP_RIGHT);
 611   add_move_binding (binding_set, GDK_KEY_KP_Right, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_RIGHT);
 612
 613   add_move_binding (binding_set, GDK_KEY_Up, 0, GTK_SCROLL_STEP_UP);
 614   add_move_binding (binding_set, GDK_KEY_Up, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_UP);
 615   add_move_binding (binding_set, GDK_KEY_KP_Up, 0, GTK_SCROLL_STEP_UP);
 616   add_move_binding (binding_set, GDK_KEY_KP_Up, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_UP);
 617   add_move_binding (binding_set, GDK_KEY_Page_Up, 0, GTK_SCROLL_PAGE_UP);
 618   add_move_binding (binding_set, GDK_KEY_KP_Page_Up, 0, GTK_SCROLL_PAGE_UP);
 619
 620   add_move_binding (binding_set, GDK_KEY_Down, 0, GTK_SCROLL_STEP_DOWN);
 621   add_move_binding (binding_set, GDK_KEY_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_DOWN);
 622   add_move_binding (binding_set, GDK_KEY_KP_Down, 0, GTK_SCROLL_STEP_DOWN);
 623   add_move_binding (binding_set, GDK_KEY_KP_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_DOWN);
 624   add_move_binding (binding_set, GDK_KEY_Page_Down, 0, GTK_SCROLL_PAGE_RIGHT);
 625   add_move_binding (binding_set, GDK_KEY_KP_Page_Down, 0, GTK_SCROLL_PAGE_RIGHT);
 626
 627   add_move_binding (binding_set, GDK_KEY_Home, 0, GTK_SCROLL_START);
 628   add_move_binding (binding_set, GDK_KEY_KP_Home, 0, GTK_SCROLL_START);
 629   add_move_binding (binding_set, GDK_KEY_End, 0, GTK_SCROLL_END);
 630   add_move_binding (binding_set, GDK_KEY_KP_End, 0, GTK_SCROLL_END);
 631
 632   g_type_class_add_private (object_class, sizeof (GtkPanedPrivate));
 633 }
 634
 635 static GType
 636 gtk_paned_child_type (GtkContainer *container)
 637 {
 638   GtkPaned *paned = GTK_PANED (container);
 639   GtkPanedPrivate *priv = paned->priv;
 640
 641   if (!priv->child1 || !priv->child2)
 642     return GTK_TYPE_WIDGET;
 643   else
 644     return G_TYPE_NONE;
 645 }
 646
 647 static void
 648 gtk_paned_init (GtkPaned *paned)
 649 {
 650   GtkPanedPrivate *priv;
 651
 652   gtk_widget_set_has_window (GTK_WIDGET (paned), FALSE);
 653   gtk_widget_set_can_focus (GTK_WIDGET (paned), TRUE);
 654
 655   /* We only need to redraw when the handle position moves, which is
 656    * independent of the overall allocation of the GtkPaned
 657    */
 658   gtk_widget_set_redraw_on_allocate (GTK_WIDGET (paned), FALSE);
 659
 660   paned->priv = G_TYPE_INSTANCE_GET_PRIVATE (paned, GTK_TYPE_PANED, GtkPanedPrivate);
 661   priv = paned->priv;
 662
 663   priv->orientation = GTK_ORIENTATION_HORIZONTAL;
 664   priv->cursor_type = GDK_SB_H_DOUBLE_ARROW;
 665
 666   priv->child1 = NULL;
 667   priv->child2 = NULL;
 668   priv->handle = NULL;
 669   priv->cursor_type = GDK_CROSS;
 670
 671   priv->handle_pos.width = 5;
 672   priv->handle_pos.height = 5;
 673   priv->position_set = FALSE;
 674   priv->last_allocation = -1;
 675   priv->in_drag = FALSE;
 676
 677   priv->last_child1_focus = NULL;
 678   priv->last_child2_focus = NULL;
 679   priv->in_recursion = FALSE;
 680   priv->handle_prelit = FALSE;
 681   priv->original_position = -1;
 682
 683   priv->handle_pos.x = -1;
 684   priv->handle_pos.y = -1;
 685
 686   priv->drag_pos = -1;
 687 }
 688
 689 static void
 690 gtk_paned_set_property (GObject        *object,
 691                         guint           prop_id,
 692                         const GValue   *value,
 693                         GParamSpec     *pspec)
 694 {
 695   GtkPaned *paned = GTK_PANED (object);
 696   GtkPanedPrivate *priv = paned->priv;
 697
 698   switch (prop_id)
 699     {
 700     case PROP_ORIENTATION:
 701       priv->orientation = g_value_get_enum (value);
 702
 703       if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
 704         priv->cursor_type = GDK_SB_H_DOUBLE_ARROW;
 705       else
 706         priv->cursor_type = GDK_SB_V_DOUBLE_ARROW;
 707
 708       /* state_flags_changed updates the cursor */
 709       gtk_paned_state_flags_changed (GTK_WIDGET (paned), 0);
 710       gtk_widget_queue_resize (GTK_WIDGET (paned));
 711       break;
 712     case PROP_POSITION:
 713       gtk_paned_set_position (paned, g_value_get_int (value));
 714       break;
 715     case PROP_POSITION_SET:
 716       priv->position_set = g_value_get_boolean (value);
 717       gtk_widget_queue_resize_no_redraw (GTK_WIDGET (paned));
 718       break;
 719     default:
 720       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 721       break;
 722     }
 723 }
 724
 725 static void
 726 gtk_paned_get_property (GObject        *object,
 727                         guint           prop_id,
 728                         GValue         *value,
 729                         GParamSpec     *pspec)
 730 {
 731   GtkPaned *paned = GTK_PANED (object);
 732   GtkPanedPrivate *priv = paned->priv;
 733
 734   switch (prop_id)
 735     {
 736     case PROP_ORIENTATION:
 737       g_value_set_enum (value, priv->orientation);
 738       break;
 739     case PROP_POSITION:
 740       g_value_set_int (value, priv->child1_size);
 741       break;
 742     case PROP_POSITION_SET:
 743       g_value_set_boolean (value, priv->position_set);
 744       break;
 745     case PROP_MIN_POSITION:
 746       g_value_set_int (value, priv->min_position);
 747       break;
 748     case PROP_MAX_POSITION:
 749       g_value_set_int (value, priv->max_position);
 750       break;
 751     default:
 752       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 753       break;
 754     }
 755 }
 756
 757 static void
 758 gtk_paned_set_child_property (GtkContainer    *container,
 759                               GtkWidget       *child,
 760                               guint            property_id,
 761                               const GValue    *value,
 762                               GParamSpec      *pspec)
 763 {
 764   GtkPaned *paned = GTK_PANED (container);
 765   GtkPanedPrivate *priv = paned->priv;
 766   gboolean old_value, new_value;
 767
 768   g_assert (child == priv->child1 || child == priv->child2);
 769
 770   new_value = g_value_get_boolean (value);
 771   switch (property_id)
 772     {
 773     case CHILD_PROP_RESIZE:
 774       if (child == priv->child1)
 775         {
 776           old_value = priv->child1_resize;
 777           priv->child1_resize = new_value;
 778         }
 779       else
 780         {
 781           old_value = priv->child2_resize;
 782           priv->child2_resize = new_value;
 783         }
 784       break;
 785     case CHILD_PROP_SHRINK:
 786       if (child == priv->child1)
 787         {
 788           old_value = priv->child1_shrink;
 789           priv->child1_shrink = new_value;
 790         }
 791       else
 792         {
 793           old_value = priv->child2_shrink;
 794           priv->child2_shrink = new_value;
 795         }
 796       break;
 797     default:
 798       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 799       old_value = -1; /* quiet gcc */
 800       break;
 801     }
 802   if (old_value != new_value)
 803     gtk_widget_queue_resize_no_redraw (GTK_WIDGET (container));
 804 }
 805
 806 static void
 807 gtk_paned_get_child_property (GtkContainer *container,
 808                               GtkWidget    *child,
 809                               guint         property_id,
 810                               GValue       *value,
 811                               GParamSpec   *pspec)
 812 {
 813   GtkPaned *paned = GTK_PANED (container);
 814   GtkPanedPrivate *priv = paned->priv;
 815
 816   g_assert (child == priv->child1 || child == priv->child2);
 817
 818   switch (property_id)
 819     {
 820     case CHILD_PROP_RESIZE:
 821       if (child == priv->child1)
 822         g_value_set_boolean (value, priv->child1_resize);
 823       else
 824         g_value_set_boolean (value, priv->child2_resize);
 825       break;
 826     case CHILD_PROP_SHRINK:
 827       if (child == priv->child1)
 828         g_value_set_boolean (value, priv->child1_shrink);
 829       else
 830         g_value_set_boolean (value, priv->child2_shrink);
 831       break;
 832     default:
 833       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
 834       break;
 835     }
 836 }
 837
 838 static void
 839 gtk_paned_finalize (GObject *object)
 840 {
 841   GtkPaned *paned = GTK_PANED (object);
 842
 843   gtk_paned_set_saved_focus (paned, NULL);
 844   gtk_paned_set_first_paned (paned, NULL);
 845
 846   G_OBJECT_CLASS (gtk_paned_parent_class)->finalize (object);
 847 }
 848
 849 static void
 850 get_preferred_size_for_size (GtkWidget      *widget,
 851                              GtkOrientation  orientation,
 852                              gint            size,
 853                              gint           *minimum,
 854                              gint           *natural)
 855 {
 856   if (orientation == GTK_ORIENTATION_HORIZONTAL)
 857     if (size < 0)
 858       gtk_widget_get_preferred_width (widget, minimum, natural);
 859     else
 860       gtk_widget_get_preferred_width_for_height (widget, size, minimum, natural);
 861   else
 862     if (size < 0)
 863       gtk_widget_get_preferred_height (widget, minimum, natural);
 864     else
 865       gtk_widget_get_preferred_height_for_width (widget, size, minimum, natural);
 866 }
 867
 868 static void
 869 gtk_paned_get_preferred_size (GtkWidget      *widget,
 870                               GtkOrientation  orientation,
 871                               gint            size,
 872                               gint           *minimum,
 873                               gint           *natural)
 874 {
 875   GtkPaned *paned = GTK_PANED (widget);
 876   GtkPanedPrivate *priv = paned->priv;
 877   gint child_min, child_nat;
 878
 879   *minimum = *natural = 0;
 880
 881   if (priv->child1 && gtk_widget_get_visible (priv->child1))
 882     {
 883       get_preferred_size_for_size (priv->child1, orientation, size, &child_min, &child_nat);
 884       *minimum = child_min;
 885       *natural = child_nat;
 886     }
 887
 888   if (priv->child2 && gtk_widget_get_visible (priv->child2))
 889     {
 890       get_preferred_size_for_size (priv->child2, orientation, size, &child_min, &child_nat);
 891
 892       if (priv->orientation == orientation)
 893         {
 894           *minimum += child_min;
 895           *natural += child_nat;
 896         }
 897       else
 898         {
 899           *minimum = MAX (*minimum, child_min);
 900           *natural = MAX (*natural, child_nat);
 901         }
 902     }
 903
 904   if (priv->child1 && gtk_widget_get_visible (priv->child1) &&
 905       priv->child2 && gtk_widget_get_visible (priv->child2))
 906     {
 907       gint handle_size;
 908
 909       gtk_widget_style_get (widget, "handle-size", &handle_size, NULL);
 910
 911       if (priv->orientation == orientation)
 912         {
 913           *minimum += handle_size;
 914           *natural += handle_size;
 915         }
 916     }
 917 }
 918
 919 static void
 920 gtk_paned_get_preferred_width (GtkWidget *widget,
 921                                gint      *minimum,
 922                                gint      *natural)
 923 {
 924   gtk_paned_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, -1, minimum, natural);
 925 }
 926
 927 static void
 928 gtk_paned_get_preferred_height (GtkWidget *widget,
 929                                 gint      *minimum,
 930                                 gint      *natural)
 931 {
 932   gtk_paned_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, -1, minimum, natural);
 933 }
 934
 935 static void
 936 flip_child (GtkWidget     *widget,
 937             GtkAllocation *child_pos)
 938 {
 939   GtkAllocation allocation;
 940   gint x, width;
 941
 942   gtk_widget_get_allocation (widget, &allocation);
 943   x = allocation.x;
 944   width = allocation.width;
 945
 946   child_pos->x = 2 * x + width - child_pos->x - child_pos->width;
 947 }
 948
 949 static void
 950 gtk_paned_size_allocate (GtkWidget     *widget,
 951                          GtkAllocation *allocation)
 952 {
 953   GtkPaned *paned = GTK_PANED (widget);
 954   GtkPanedPrivate *priv = paned->priv;
 955   GtkAllocation widget_allocation;
 956
 957   gtk_widget_set_allocation (widget, allocation);
 958
 959   if (priv->child1 && gtk_widget_get_visible (priv->child1) &&
 960       priv->child2 && gtk_widget_get_visible (priv->child2))
 961     {
 962       GtkRequisition child1_requisition;
 963       GtkRequisition child2_requisition;
 964       GtkAllocation child1_allocation;
 965       GtkAllocation child2_allocation;
 966       GtkAllocation priv_child1_allocation;
 967       GdkRectangle old_handle_pos;
 968       gint handle_size;
 969
 970       gtk_widget_style_get (widget, "handle-size", &handle_size, NULL);
 971
 972       gtk_widget_get_preferred_size (priv->child1, &child1_requisition, NULL);
 973       gtk_widget_get_preferred_size (priv->child2, &child2_requisition, NULL);
 974
 975       old_handle_pos = priv->handle_pos;
 976
 977       gtk_widget_get_allocation (widget, &widget_allocation);
 978
 979       if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
 980         {
 981           gtk_paned_calc_position (paned,
 982                                    MAX (1, widget_allocation.width - handle_size),
 983                                    child1_requisition.width,
 984                                    child2_requisition.width);
 985
 986           priv->handle_pos.x = widget_allocation.x + priv->child1_size;
 987           priv->handle_pos.y = widget_allocation.y;
 988           priv->handle_pos.width = handle_size;
 989           priv->handle_pos.height = widget_allocation.height;
 990
 991           child1_allocation.height = child2_allocation.height = allocation->height;
 992           child1_allocation.width = MAX (1, priv->child1_size);
 993           child1_allocation.x = widget_allocation.x;
 994           child1_allocation.y = child2_allocation.y = widget_allocation.y;
 995
 996           child2_allocation.x = child1_allocation.x + priv->child1_size + priv->handle_pos.width;
 997           child2_allocation.width = MAX (1, widget_allocation.x + widget_allocation.width - child2_allocation.x);
 998
 999           if (gtk_widget_get_direction (GTK_WIDGET (widget)) == GTK_TEXT_DIR_RTL)
1000             {
1001               flip_child (widget, &(child2_allocation));
1002               flip_child (widget, &(child1_allocation));
1003               flip_child (widget, &(priv->handle_pos));
1004             }
1005         }
1006       else
1007         {
1008           gtk_paned_calc_position (paned,
1009                                    MAX (1, widget_allocation.height - handle_size),
1010                                    child1_requisition.height,
1011                                    child2_requisition.height);
1012
1013           priv->handle_pos.x = widget_allocation.x;
1014           priv->handle_pos.y = widget_allocation.y + priv->child1_size;
1015           priv->handle_pos.width = widget_allocation.width;
1016           priv->handle_pos.height = handle_size;
1017
1018           child1_allocation.width = child2_allocation.width = allocation->width;
1019           child1_allocation.height = MAX (1, priv->child1_size);
1020           child1_allocation.x = child2_allocation.x = widget_allocation.x;
1021           child1_allocation.y = widget_allocation.y;
1022
1023           child2_allocation.y = child1_allocation.y + priv->child1_size + priv->handle_pos.height;
1024           child2_allocation.height = MAX (1, widget_allocation.y + widget_allocation.height - child2_allocation.y);
1025         }
1026
1027       if (gtk_widget_get_mapped (widget) &&
1028           (old_handle_pos.x != priv->handle_pos.x ||
1029            old_handle_pos.y != priv->handle_pos.y ||
1030            old_handle_pos.width != priv->handle_pos.width ||
1031            old_handle_pos.height != priv->handle_pos.height))
1032         {
1033           GdkWindow *window;
1034
1035           window = gtk_widget_get_window (widget);
1036           gdk_window_invalidate_rect (window, &old_handle_pos, FALSE);
1037           gdk_window_invalidate_rect (window, &priv->handle_pos, FALSE);
1038         }
1039
1040       if (gtk_widget_get_realized (widget))
1041         {
1042           if (gtk_widget_get_mapped (widget))
1043             gdk_window_show (priv->handle);
1044
1045           if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
1046             {
1047               gdk_window_move_resize (priv->handle,
1048                                       priv->handle_pos.x,
1049                                       priv->handle_pos.y,
1050                                       handle_size,
1051                                       priv->handle_pos.height);
1052             }
1053           else
1054             {
1055               gdk_window_move_resize (priv->handle,
1056                                       priv->handle_pos.x,
1057                                       priv->handle_pos.y,
1058                                       priv->handle_pos.width,
1059                                       handle_size);
1060             }
1061         }
1062
1063       /* Now allocate the childen, making sure, when resizing not to
1064        * overlap the windows
1065        */
1066       gtk_widget_get_allocation (priv->child1, &priv_child1_allocation);
1067       if (gtk_widget_get_mapped (widget) &&
1068           ((priv->orientation == GTK_ORIENTATION_HORIZONTAL &&
1069             priv_child1_allocation.width < child1_allocation.width) ||
1070
1071            (priv->orientation == GTK_ORIENTATION_VERTICAL &&
1072             priv_child1_allocation.height < child1_allocation.height)))
1073         {
1074           gtk_widget_size_allocate (priv->child2, &child2_allocation);
1075           gtk_widget_size_allocate (priv->child1, &child1_allocation);
1076         }
1077       else
1078         {
1079           gtk_widget_size_allocate (priv->child1, &child1_allocation);
1080           gtk_widget_size_allocate (priv->child2, &child2_allocation);
1081         }
1082     }
1083   else
1084     {
1085       GtkAllocation child_allocation;
1086
1087       if (gtk_widget_get_realized (widget))
1088         gdk_window_hide (priv->handle);
1089
1090       if (priv->child1)
1091         gtk_widget_set_child_visible (priv->child1, TRUE);
1092       if (priv->child2)
1093         gtk_widget_set_child_visible (priv->child2, TRUE);
1094
1095       gtk_widget_get_allocation (widget, &widget_allocation);
1096
1097       child_allocation.x = widget_allocation.x;
1098       child_allocation.y = widget_allocation.y;
1099       child_allocation.width = allocation->width;
1100       child_allocation.height = allocation->height;
1101
1102       if (priv->child1 && gtk_widget_get_visible (priv->child1))
1103         gtk_widget_size_allocate (priv->child1, &child_allocation);
1104       else if (priv->child2 && gtk_widget_get_visible (priv->child2))
1105         gtk_widget_size_allocate (priv->child2, &child_allocation);
1106     }
1107 }
1108
1109 static void
1110 gtk_paned_realize (GtkWidget *widget)
1111 {
1112   GtkPaned *paned = GTK_PANED (widget);
1113   GtkPanedPrivate *priv = paned->priv;
1114   GdkWindow *window;
1115   GdkWindowAttr attributes;
1116   gint attributes_mask;
1117
1118   gtk_widget_set_realized (widget, TRUE);
1119
1120   window = gtk_widget_get_parent_window (widget);
1121   gtk_widget_set_window (widget, window);
1122   g_object_ref (window);
1123
1124   attributes.window_type = GDK_WINDOW_CHILD;
1125   attributes.wclass = GDK_INPUT_ONLY;
1126   attributes.x = priv->handle_pos.x;
1127   attributes.y = priv->handle_pos.y;
1128   attributes.width = priv->handle_pos.width;
1129   attributes.height = priv->handle_pos.height;
1130   attributes.event_mask = gtk_widget_get_events (widget);
1131   attributes.event_mask |= (GDK_BUTTON_PRESS_MASK |
1132                             GDK_BUTTON_RELEASE_MASK |
1133                             GDK_ENTER_NOTIFY_MASK |
1134                             GDK_LEAVE_NOTIFY_MASK |
1135                             GDK_POINTER_MOTION_MASK |
1136                             GDK_POINTER_MOTION_HINT_MASK);
1137   attributes_mask = GDK_WA_X | GDK_WA_Y;
1138   if (gtk_widget_is_sensitive (widget))
1139     {
1140       attributes.cursor = gdk_cursor_new_for_display (gtk_widget_get_display (widget),
1141                                                       priv->cursor_type);
1142       attributes_mask |= GDK_WA_CURSOR;
1143     }
1144
1145   priv->handle = gdk_window_new (window,
1146                                  &attributes, attributes_mask);
1147   gdk_window_set_user_data (priv->handle, paned);
1148   if (attributes_mask & GDK_WA_CURSOR)
1149     g_object_unref (attributes.cursor);
1150
1151   if (priv->child1 && gtk_widget_get_visible (priv->child1) &&
1152       priv->child2 && gtk_widget_get_visible (priv->child2))
1153     gdk_window_show (priv->handle);
1154 }
1155
1156 static void
1157 gtk_paned_unrealize (GtkWidget *widget)
1158 {
1159   GtkPaned *paned = GTK_PANED (widget);
1160   GtkPanedPrivate *priv = paned->priv;
1161
1162   if (priv->handle)
1163     {
1164       gdk_window_set_user_data (priv->handle, NULL);
1165       gdk_window_destroy (priv->handle);
1166       priv->handle = NULL;
1167     }
1168
1169   gtk_paned_set_last_child1_focus (paned, NULL);
1170   gtk_paned_set_last_child2_focus (paned, NULL);
1171   gtk_paned_set_saved_focus (paned, NULL);
1172   gtk_paned_set_first_paned (paned, NULL);
1173
1174   GTK_WIDGET_CLASS (gtk_paned_parent_class)->unrealize (widget);
1175 }
1176
1177 static void
1178 gtk_paned_map (GtkWidget *widget)
1179 {
1180   GtkPaned *paned = GTK_PANED (widget);
1181   GtkPanedPrivate *priv = paned->priv;
1182
1183   gdk_window_show (priv->handle);
1184
1185   GTK_WIDGET_CLASS (gtk_paned_parent_class)->map (widget);
1186 }
1187
1188 static void
1189 gtk_paned_unmap (GtkWidget *widget)
1190 {
1191   GtkPaned *paned = GTK_PANED (widget);
1192   GtkPanedPrivate *priv = paned->priv;
1193
1194   gdk_window_hide (priv->handle);
1195
1196   GTK_WIDGET_CLASS (gtk_paned_parent_class)->unmap (widget);
1197 }
1198
1199 static gboolean
1200 gtk_paned_draw (GtkWidget *widget,
1201                 cairo_t   *cr)
1202 {
1203   GtkPaned *paned = GTK_PANED (widget);
1204   GtkPanedPrivate *priv = paned->priv;
1205
1206   if (gtk_widget_get_visible (widget) && gtk_widget_get_mapped (widget) &&
1207       priv->child1 && gtk_widget_get_visible (priv->child1) &&
1208       priv->child2 && gtk_widget_get_visible (priv->child2))
1209     {
1210       GtkStyleContext *context;
1211       GtkStateFlags state;
1212       GtkAllocation allocation;
1213
1214       gtk_widget_get_allocation (widget, &allocation);
1215       context = gtk_widget_get_style_context (widget);
1216       state = gtk_widget_get_state_flags (widget);
1217
1218       if (gtk_widget_is_focus (widget))
1219         state |= GTK_STATE_FLAG_SELECTED;
1220       if (priv->handle_prelit)
1221         state |= GTK_STATE_FLAG_PRELIGHT;
1222
1223       gtk_style_context_save (context);
1224       gtk_style_context_set_state (context, state);
1225       gtk_style_context_add_class (context, GTK_STYLE_CLASS_PANE_SEPARATOR);
1226       gtk_render_handle (context, cr,
1227                          priv->handle_pos.x - allocation.x,
1228                          priv->handle_pos.y - allocation.y,
1229                          priv->handle_pos.width,
1230                          priv->handle_pos.height);
1231
1232       gtk_style_context_restore (context);
1233     }
1234
1235   /* Chain up to draw children */
1236   GTK_WIDGET_CLASS (gtk_paned_parent_class)->draw (widget, cr);
1237
1238   return FALSE;
1239 }
1240
1241 static gboolean
1242 is_rtl (GtkPaned *paned)
1243 {
1244   GtkPanedPrivate *priv = paned->priv;
1245
1246   if (priv->orientation == GTK_ORIENTATION_HORIZONTAL &&
1247       gtk_widget_get_direction (GTK_WIDGET (paned)) == GTK_TEXT_DIR_RTL)
1248     {
1249       return TRUE;
1250     }
1251
1252   return FALSE;
1253 }
1254
1255 static void
1256 update_drag (GtkPaned *paned)
1257 {
1258   GtkPanedPrivate *priv = paned->priv;
1259   GtkAllocation allocation;
1260   GtkWidget *widget = GTK_WIDGET (paned);
1261   gint pos;
1262   gint handle_size;
1263   gint size;
1264
1265   if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
1266     gtk_widget_get_pointer (widget, &pos, NULL);
1267   else
1268     gtk_widget_get_pointer (widget, NULL, &pos);
1269
1270   pos -= priv->drag_pos;
1271
1272   if (is_rtl (paned))
1273     {
1274       gtk_widget_style_get (widget,
1275                             "handle-size", &handle_size,
1276                             NULL);
1277
1278       gtk_widget_get_allocation (widget, &allocation);
1279       size = allocation.width - pos - handle_size;
1280     }
1281   else
1282     {
1283       size = pos;
1284     }
1285
1286   size = CLAMP (size, priv->min_position, priv->max_position);
1287
1288   if (size != priv->child1_size)
1289     gtk_paned_set_position (paned, size);
1290 }
1291
1292 static gboolean
1293 gtk_paned_enter (GtkWidget        *widget,
1294                  GdkEventCrossing *event)
1295 {
1296   GtkPaned *paned = GTK_PANED (widget);
1297   GtkPanedPrivate *priv = paned->priv;
1298
1299   if (priv->in_drag)
1300     update_drag (paned);
1301   else
1302     {
1303       priv->handle_prelit = TRUE;
1304       gtk_widget_queue_draw_area (widget,
1305                                   priv->handle_pos.x,
1306                                   priv->handle_pos.y,
1307                                   priv->handle_pos.width,
1308                                   priv->handle_pos.height);
1309     }
1310
1311   return TRUE;
1312 }
1313
1314 static gboolean
1315 gtk_paned_leave (GtkWidget        *widget,
1316                  GdkEventCrossing *event)
1317 {
1318   GtkPaned *paned = GTK_PANED (widget);
1319   GtkPanedPrivate *priv = paned->priv;
1320
1321   if (priv->in_drag)
1322     update_drag (paned);
1323   else
1324     {
1325       priv->handle_prelit = FALSE;
1326       gtk_widget_queue_draw_area (widget,
1327                                   priv->handle_pos.x,
1328                                   priv->handle_pos.y,
1329                                   priv->handle_pos.width,
1330                                   priv->handle_pos.height);
1331     }
1332
1333   return TRUE;
1334 }
1335
1336 static gboolean
1337 gtk_paned_focus (GtkWidget        *widget,
1338                  GtkDirectionType  direction)
1339
1340 {
1341   gboolean retval;
1342
1343   /* This is a hack, but how can this be done without
1344    * excessive cut-and-paste from gtkcontainer.c?
1345    */
1346
1347   gtk_widget_set_can_focus (widget, FALSE);
1348   retval = GTK_WIDGET_CLASS (gtk_paned_parent_class)->focus (widget, direction);
1349   gtk_widget_set_can_focus (widget, TRUE);
1350
1351   return retval;
1352 }
1353
1354 static gboolean
1355 gtk_paned_button_press (GtkWidget      *widget,
1356                         GdkEventButton *event)
1357 {
1358   GtkPaned *paned = GTK_PANED (widget);
1359   GtkPanedPrivate *priv = paned->priv;
1360
1361   if (!priv->in_drag &&
1362       (event->window == priv->handle) && (event->button == 1))
1363     {
1364       /* We need a server grab here, not gtk_grab_add(), since
1365        * we don't want to pass events on to the widget's children */
1366       if (gdk_device_grab (event->device,
1367                            priv->handle,
1368                            GDK_OWNERSHIP_WINDOW, FALSE,
1369                            GDK_POINTER_MOTION_HINT_MASK
1370                            | GDK_BUTTON1_MOTION_MASK
1371                            | GDK_BUTTON_RELEASE_MASK
1372                            | GDK_ENTER_NOTIFY_MASK
1373                            | GDK_LEAVE_NOTIFY_MASK,
1374                            NULL, event->time) != GDK_GRAB_SUCCESS)
1375         return FALSE;
1376
1377       priv->in_drag = TRUE;
1378       priv->grab_time = event->time;
1379       priv->grab_device = event->device;
1380
1381       if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
1382         priv->drag_pos = event->x;
1383       else
1384         priv->drag_pos = event->y;
1385
1386       return TRUE;
1387     }
1388
1389   return FALSE;
1390 }
1391
1392 static gboolean
1393 gtk_paned_grab_broken (GtkWidget          *widget,
1394                        GdkEventGrabBroken *event)
1395 {
1396   GtkPaned *paned = GTK_PANED (widget);
1397   GtkPanedPrivate *priv = paned->priv;
1398
1399   priv->in_drag = FALSE;
1400   priv->drag_pos = -1;
1401   priv->position_set = TRUE;
1402
1403   return TRUE;
1404 }
1405
1406 static void
1407 stop_drag (GtkPaned *paned)
1408 {
1409   GtkPanedPrivate *priv = paned->priv;
1410
1411   priv->in_drag = FALSE;
1412   priv->drag_pos = -1;
1413   priv->position_set = TRUE;
1414
1415   gdk_device_ungrab (priv->grab_device,
1416                      priv->grab_time);
1417   priv->grab_device = NULL;
1418 }
1419
1420 static void
1421 gtk_paned_grab_notify (GtkWidget *widget,
1422                        gboolean   was_grabbed)
1423 {
1424   GtkPaned *paned = GTK_PANED (widget);
1425   GtkPanedPrivate *priv = paned->priv;
1426   GdkDevice *grab_device;
1427
1428   grab_device = priv->grab_device;
1429
1430   if (priv->in_drag && grab_device &&
1431       gtk_widget_device_is_shadowed (widget, grab_device))
1432     stop_drag (paned);
1433 }
1434
1435 static void
1436 gtk_paned_state_flags_changed (GtkWidget     *widget,
1437                                GtkStateFlags  previous_state)
1438 {
1439   GtkPaned *paned = GTK_PANED (widget);
1440   GtkPanedPrivate *priv = paned->priv;
1441   GdkCursor *cursor;
1442
1443   if (gtk_widget_get_realized (widget))
1444     {
1445       if (gtk_widget_is_sensitive (widget))
1446         cursor = gdk_cursor_new_for_display (gtk_widget_get_display (widget),
1447                                              priv->cursor_type);
1448       else
1449         cursor = NULL;
1450
1451       gdk_window_set_cursor (priv->handle, cursor);
1452
1453       if (cursor)
1454         g_object_unref (cursor);
1455     }
1456 }
1457
1458 static gboolean
1459 gtk_paned_button_release (GtkWidget      *widget,
1460                           GdkEventButton *event)
1461 {
1462   GtkPaned *paned = GTK_PANED (widget);
1463   GtkPanedPrivate *priv = paned->priv;
1464
1465   if (priv->in_drag && (event->button == 1))
1466     {
1467       stop_drag (paned);
1468
1469       return TRUE;
1470     }
1471
1472   return FALSE;
1473 }
1474
1475 static gboolean
1476 gtk_paned_motion (GtkWidget      *widget,
1477                   GdkEventMotion *event)
1478 {
1479   GtkPaned *paned = GTK_PANED (widget);
1480   GtkPanedPrivate *priv = paned->priv;
1481
1482   if (priv->in_drag)
1483     {
1484       update_drag (paned);
1485       return TRUE;
1486     }
1487
1488   return FALSE;
1489 }
1490
1491 /**
1492  * gtk_paned_new:
1493  * @orientation: the paned's orientation.
1494  *
1495  * Creates a new #GtkPaned widget.
1496  *
1497  * Return value: a new #GtkPaned.
1498  *
1499  * Since: 3.0
1500  **/
1501 GtkWidget *
1502 gtk_paned_new (GtkOrientation orientation)
1503 {
1504   return g_object_new (GTK_TYPE_PANED,
1505                        "orientation", orientation,
1506                        NULL);
1507 }
1508
1509 /**
1510  * gtk_paned_add1:
1511  * @paned: a paned widget
1512  * @child: the child to add
1513  *
1514  * Adds a child to the top or left pane with default parameters. This is
1515  * equivalent to
1516  * <literal>gtk_paned_pack1 (paned, child, FALSE, TRUE)</literal>.
1517  */
1518 void
1519 gtk_paned_add1 (GtkPaned  *paned,
1520                 GtkWidget *widget)
1521 {
1522   gtk_paned_pack1 (paned, widget, FALSE, TRUE);
1523 }
1524
1525 /**
1526  * gtk_paned_add2:
1527  * @paned: a paned widget
1528  * @child: the child to add
1529  *
1530  * Adds a child to the bottom or right pane with default parameters. This
1531  * is equivalent to
1532  * <literal>gtk_paned_pack2 (paned, child, TRUE, TRUE)</literal>.
1533  */
1534 void
1535 gtk_paned_add2 (GtkPaned  *paned,
1536                 GtkWidget *widget)
1537 {
1538   gtk_paned_pack2 (paned, widget, TRUE, TRUE);
1539 }
1540
1541 /**
1542  * gtk_paned_pack1:
1543  * @paned: a paned widget
1544  * @child: the child to add
1545  * @resize: should this child expand when the paned widget is resized.
1546  * @shrink: can this child be made smaller than its requisition.
1547  *
1548  * Adds a child to the top or left pane.
1549  */
1550 void
1551 gtk_paned_pack1 (GtkPaned  *paned,
1552                  GtkWidget *child,
1553                  gboolean   resize,
1554                  gboolean   shrink)
1555 {
1556   GtkPanedPrivate *priv;
1557
1558   g_return_if_fail (GTK_IS_PANED (paned));
1559   g_return_if_fail (GTK_IS_WIDGET (child));
1560
1561   priv = paned->priv;
1562
1563   if (!priv->child1)
1564     {
1565       priv->child1 = child;
1566       priv->child1_resize = resize;
1567       priv->child1_shrink = shrink;
1568
1569       gtk_widget_set_parent (child, GTK_WIDGET (paned));
1570     }
1571 }
1572
1573 /**
1574  * gtk_paned_pack2:
1575  * @paned: a paned widget
1576  * @child: the child to add
1577  * @resize: should this child expand when the paned widget is resized.
1578  * @shrink: can this child be made smaller than its requisition.
1579  *
1580  * Adds a child to the bottom or right pane.
1581  */
1582 void
1583 gtk_paned_pack2 (GtkPaned  *paned,
1584                  GtkWidget *child,
1585                  gboolean   resize,
1586                  gboolean   shrink)
1587 {
1588   GtkPanedPrivate *priv;
1589
1590   g_return_if_fail (GTK_IS_PANED (paned));
1591   g_return_if_fail (GTK_IS_WIDGET (child));
1592
1593   priv = paned->priv;
1594
1595   if (!priv->child2)
1596     {
1597       priv->child2 = child;
1598       priv->child2_resize = resize;
1599       priv->child2_shrink = shrink;
1600
1601       gtk_widget_set_parent (child, GTK_WIDGET (paned));
1602     }
1603 }
1604
1605
1606 static void
1607 gtk_paned_add (GtkContainer *container,
1608                GtkWidget    *widget)
1609 {
1610   GtkPanedPrivate *priv;
1611   GtkPaned *paned;
1612
1613   g_return_if_fail (GTK_IS_PANED (container));
1614
1615   paned = GTK_PANED (container);
1616   priv = paned->priv;
1617
1618   if (!priv->child1)
1619     gtk_paned_add1 (paned, widget);
1620   else if (!priv->child2)
1621     gtk_paned_add2 (paned, widget);
1622   else
1623     g_warning ("GtkPaned cannot have more than 2 children\n");
1624 }
1625
1626 static void
1627 gtk_paned_remove (GtkContainer *container,
1628                   GtkWidget    *widget)
1629 {
1630   GtkPaned *paned = GTK_PANED (container);
1631   GtkPanedPrivate *priv = paned->priv;
1632   gboolean was_visible;
1633
1634   was_visible = gtk_widget_get_visible (widget);
1635
1636   if (priv->child1 == widget)
1637     {
1638       gtk_widget_unparent (widget);
1639
1640       priv->child1 = NULL;
1641
1642       if (was_visible && gtk_widget_get_visible (GTK_WIDGET (container)))
1643         gtk_widget_queue_resize_no_redraw (GTK_WIDGET (container));
1644     }
1645   else if (priv->child2 == widget)
1646     {
1647       gtk_widget_unparent (widget);
1648
1649       priv->child2 = NULL;
1650
1651       if (was_visible && gtk_widget_get_visible (GTK_WIDGET (container)))
1652         gtk_widget_queue_resize_no_redraw (GTK_WIDGET (container));
1653     }
1654 }
1655
1656 static void
1657 gtk_paned_forall (GtkContainer *container,
1658                   gboolean      include_internals,
1659                   GtkCallback   callback,
1660                   gpointer      callback_data)
1661 {
1662   GtkPanedPrivate *priv;
1663   GtkPaned *paned;
1664
1665   g_return_if_fail (callback != NULL);
1666
1667   paned = GTK_PANED (container);
1668   priv = paned->priv;
1669
1670   if (priv->child1)
1671     (*callback) (priv->child1, callback_data);
1672   if (priv->child2)
1673     (*callback) (priv->child2, callback_data);
1674 }
1675
1676 /**
1677  * gtk_paned_get_position:
1678  * @paned: a #GtkPaned widget
1679  *
1680  * Obtains the position of the divider between the two panes.
1681  *
1682  * Return value: position of the divider
1683  **/
1684 gint
1685 gtk_paned_get_position (GtkPaned  *paned)
1686 {
1687   g_return_val_if_fail (GTK_IS_PANED (paned), 0);
1688
1689   return paned->priv->child1_size;
1690 }
1691
1692 /**
1693  * gtk_paned_set_position:
1694  * @paned: a #GtkPaned widget
1695  * @position: pixel position of divider, a negative value means that the position
1696  *            is unset.
1697  *
1698  * Sets the position of the divider between the two panes.
1699  **/
1700 void
1701 gtk_paned_set_position (GtkPaned *paned,
1702                         gint      position)
1703 {
1704   GtkPanedPrivate *priv;
1705   GObject *object;
1706
1707   g_return_if_fail (GTK_IS_PANED (paned));
1708
1709   priv = paned->priv;
1710
1711   if (priv->child1_size == position)
1712     return;
1713
1714   object = G_OBJECT (paned);
1715
1716   if (position >= 0)
1717     {
1718       /* We don't clamp here - the assumption is that
1719        * if the total allocation changes at the same time
1720        * as the position, the position set is with reference
1721        * to the new total size. If only the position changes,
1722        * then clamping will occur in gtk_paned_calc_position()
1723        */
1724
1725       priv->child1_size = position;
1726       priv->position_set = TRUE;
1727     }
1728   else
1729     {
1730       priv->position_set = FALSE;
1731     }
1732
1733   g_object_freeze_notify (object);
1734   g_object_notify (object, "position");
1735   g_object_notify (object, "position-set");
1736   g_object_thaw_notify (object);
1737
1738   gtk_widget_queue_resize_no_redraw (GTK_WIDGET (paned));
1739
1740 #ifdef G_OS_WIN32
1741   /* Hacky work-around for bug #144269 */
1742   if (priv->child2 != NULL)
1743     {
1744       gtk_widget_queue_draw (priv->child2);
1745     }
1746 #endif
1747 }
1748
1749 /**
1750  * gtk_paned_get_child1:
1751  * @paned: a #GtkPaned widget
1752  *
1753  * Obtains the first child of the paned widget.
1754  *
1755  * Return value: (transfer none): first child, or %NULL if it is not set.
1756  *
1757  * Since: 2.4
1758  **/
1759 GtkWidget *
1760 gtk_paned_get_child1 (GtkPaned *paned)
1761 {
1762   g_return_val_if_fail (GTK_IS_PANED (paned), NULL);
1763
1764   return paned->priv->child1;
1765 }
1766
1767 /**
1768  * gtk_paned_get_child2:
1769  * @paned: a #GtkPaned widget
1770  *
1771  * Obtains the second child of the paned widget.
1772  *
1773  * Return value: (transfer none): second child, or %NULL if it is not set.
1774  *
1775  * Since: 2.4
1776  **/
1777 GtkWidget *
1778 gtk_paned_get_child2 (GtkPaned *paned)
1779 {
1780   g_return_val_if_fail (GTK_IS_PANED (paned), NULL);
1781
1782   return paned->priv->child2;
1783 }
1784
1785 static void
1786 gtk_paned_calc_position (GtkPaned *paned,
1787                          gint      allocation,
1788                          gint      child1_req,
1789                          gint      child2_req)
1790 {
1791   GtkPanedPrivate *priv = paned->priv;
1792   gint old_position;
1793   gint old_min_position;
1794   gint old_max_position;
1795
1796   old_position = priv->child1_size;
1797   old_min_position = priv->min_position;
1798   old_max_position = priv->max_position;
1799
1800   priv->min_position = priv->child1_shrink ? 0 : child1_req;
1801
1802   priv->max_position = allocation;
1803   if (!priv->child2_shrink)
1804     priv->max_position = MAX (1, priv->max_position - child2_req);
1805   priv->max_position = MAX (priv->min_position, priv->max_position);
1806
1807   if (!priv->position_set)
1808     {
1809       if (priv->child1_resize && !priv->child2_resize)
1810         priv->child1_size = MAX (0, allocation - child2_req);
1811       else if (!priv->child1_resize && priv->child2_resize)
1812         priv->child1_size = child1_req;
1813       else if (child1_req + child2_req != 0)
1814         priv->child1_size = allocation * ((gdouble)child1_req / (child1_req + child2_req)) + 0.5;
1815       else
1816         priv->child1_size = allocation * 0.5 + 0.5;
1817     }
1818   else
1819     {
1820       /* If the position was set before the initial allocation.
1821        * (priv->last_allocation <= 0) just clamp it and leave it.
1822        */
1823       if (priv->last_allocation > 0)
1824         {
1825           if (priv->child1_resize && !priv->child2_resize)
1826             priv->child1_size += allocation - priv->last_allocation;
1827           else if (!(!priv->child1_resize && priv->child2_resize))
1828             priv->child1_size = allocation * ((gdouble) priv->child1_size / (priv->last_allocation)) + 0.5;
1829         }
1830     }
1831
1832   priv->child1_size = CLAMP (priv->child1_size,
1833                               priv->min_position,
1834                               priv->max_position);
1835
1836   if (priv->child1)
1837     gtk_widget_set_child_visible (priv->child1, priv->child1_size != 0);
1838
1839   if (priv->child2)
1840     gtk_widget_set_child_visible (priv->child2, priv->child1_size != allocation);
1841
1842   g_object_freeze_notify (G_OBJECT (paned));
1843   if (priv->child1_size != old_position)
1844     g_object_notify (G_OBJECT (paned), "position");
1845   if (priv->min_position != old_min_position)
1846     g_object_notify (G_OBJECT (paned), "min-position");
1847   if (priv->max_position != old_max_position)
1848     g_object_notify (G_OBJECT (paned), "max-position");
1849   g_object_thaw_notify (G_OBJECT (paned));
1850
1851   priv->last_allocation = allocation;
1852 }
1853
1854 static void
1855 gtk_paned_set_saved_focus (GtkPaned *paned, GtkWidget *widget)
1856 {
1857   GtkPanedPrivate *priv = paned->priv;
1858
1859   if (priv->saved_focus)
1860     g_object_remove_weak_pointer (G_OBJECT (priv->saved_focus),
1861                                   (gpointer *)&(priv->saved_focus));
1862
1863   priv->saved_focus = widget;
1864
1865   if (priv->saved_focus)
1866     g_object_add_weak_pointer (G_OBJECT (priv->saved_focus),
1867                                (gpointer *)&(priv->saved_focus));
1868 }
1869
1870 static void
1871 gtk_paned_set_first_paned (GtkPaned *paned, GtkPaned *first_paned)
1872 {
1873   GtkPanedPrivate *priv = paned->priv;
1874
1875   if (priv->first_paned)
1876     g_object_remove_weak_pointer (G_OBJECT (priv->first_paned),
1877                                   (gpointer *)&(priv->first_paned));
1878
1879   priv->first_paned = first_paned;
1880
1881   if (priv->first_paned)
1882     g_object_add_weak_pointer (G_OBJECT (priv->first_paned),
1883                                (gpointer *)&(priv->first_paned));
1884 }
1885
1886 static void
1887 gtk_paned_set_last_child1_focus (GtkPaned *paned, GtkWidget *widget)
1888 {
1889   GtkPanedPrivate *priv = paned->priv;
1890
1891   if (priv->last_child1_focus)
1892     g_object_remove_weak_pointer (G_OBJECT (priv->last_child1_focus),
1893                                   (gpointer *)&(priv->last_child1_focus));
1894
1895   priv->last_child1_focus = widget;
1896
1897   if (priv->last_child1_focus)
1898     g_object_add_weak_pointer (G_OBJECT (priv->last_child1_focus),
1899                                (gpointer *)&(priv->last_child1_focus));
1900 }
1901
1902 static void
1903 gtk_paned_set_last_child2_focus (GtkPaned *paned, GtkWidget *widget)
1904 {
1905   GtkPanedPrivate *priv = paned->priv;
1906
1907   if (priv->last_child2_focus)
1908     g_object_remove_weak_pointer (G_OBJECT (priv->last_child2_focus),
1909                                   (gpointer *)&(priv->last_child2_focus));
1910
1911   priv->last_child2_focus = widget;
1912
1913   if (priv->last_child2_focus)
1914     g_object_add_weak_pointer (G_OBJECT (priv->last_child2_focus),
1915                                (gpointer *)&(priv->last_child2_focus));
1916 }
1917
1918 static GtkWidget *
1919 paned_get_focus_widget (GtkPaned *paned)
1920 {
1921   GtkWidget *toplevel;
1922
1923   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (paned));
1924   if (gtk_widget_is_toplevel (toplevel))
1925     return gtk_window_get_focus (GTK_WINDOW (toplevel));
1926
1927   return NULL;
1928 }
1929
1930 static void
1931 gtk_paned_set_focus_child (GtkContainer *container,
1932                            GtkWidget    *focus_child)
1933 {
1934   GtkPaned *paned;
1935   GtkPanedPrivate *priv;
1936   GtkWidget *container_focus_child;
1937
1938   g_return_if_fail (GTK_IS_PANED (container));
1939
1940   paned = GTK_PANED (container);
1941   priv = paned->priv;
1942
1943   if (focus_child == NULL)
1944     {
1945       GtkWidget *last_focus;
1946       GtkWidget *w;
1947
1948       last_focus = paned_get_focus_widget (paned);
1949
1950       if (last_focus)
1951         {
1952           /* If there is one or more paned widgets between us and the
1953            * focus widget, we want the topmost of those as last_focus
1954            */
1955           for (w = last_focus; w != GTK_WIDGET (paned); w = gtk_widget_get_parent (w))
1956             if (GTK_IS_PANED (w))
1957               last_focus = w;
1958
1959           container_focus_child = gtk_container_get_focus_child (container);
1960           if (container_focus_child == priv->child1)
1961             gtk_paned_set_last_child1_focus (paned, last_focus);
1962           else if (container_focus_child == priv->child2)
1963             gtk_paned_set_last_child2_focus (paned, last_focus);
1964         }
1965     }
1966
1967   if (GTK_CONTAINER_CLASS (gtk_paned_parent_class)->set_focus_child)
1968     GTK_CONTAINER_CLASS (gtk_paned_parent_class)->set_focus_child (container, focus_child);
1969 }
1970
1971 static void
1972 gtk_paned_get_cycle_chain (GtkPaned          *paned,
1973                            GtkDirectionType   direction,
1974                            GList            **widgets)
1975 {
1976   GtkPanedPrivate *priv = paned->priv;
1977   GtkContainer *container = GTK_CONTAINER (paned);
1978   GtkWidget *ancestor = NULL;
1979   GtkWidget *focus_child;
1980   GtkWidget *parent;
1981   GtkWidget *widget = GTK_WIDGET (paned);
1982   GList *temp_list = NULL;
1983   GList *list;
1984
1985   if (priv->in_recursion)
1986     return;
1987
1988   g_assert (widgets != NULL);
1989
1990   if (priv->last_child1_focus &&
1991       !gtk_widget_is_ancestor (priv->last_child1_focus, widget))
1992     {
1993       gtk_paned_set_last_child1_focus (paned, NULL);
1994     }
1995
1996   if (priv->last_child2_focus &&
1997       !gtk_widget_is_ancestor (priv->last_child2_focus, widget))
1998     {
1999       gtk_paned_set_last_child2_focus (paned, NULL);
2000     }
2001
2002   parent = gtk_widget_get_parent (widget);
2003   if (parent)
2004     ancestor = gtk_widget_get_ancestor (parent, GTK_TYPE_PANED);
2005
2006   /* The idea here is that temp_list is a list of widgets we want to cycle
2007    * to. The list is prioritized so that the first element is our first
2008    * choice, the next our second, and so on.
2009    *
2010    * We can't just use g_list_reverse(), because we want to try
2011    * priv->last_child?_focus before priv->child?, both when we
2012    * are going forward and backward.
2013    */
2014   focus_child = gtk_container_get_focus_child (container);
2015   if (direction == GTK_DIR_TAB_FORWARD)
2016     {
2017       if (focus_child == priv->child1)
2018         {
2019           temp_list = g_list_append (temp_list, priv->last_child2_focus);
2020           temp_list = g_list_append (temp_list, priv->child2);
2021           temp_list = g_list_append (temp_list, ancestor);
2022         }
2023       else if (focus_child == priv->child2)
2024         {
2025           temp_list = g_list_append (temp_list, ancestor);
2026           temp_list = g_list_append (temp_list, priv->last_child1_focus);
2027           temp_list = g_list_append (temp_list, priv->child1);
2028         }
2029       else
2030         {
2031           temp_list = g_list_append (temp_list, priv->last_child1_focus);
2032           temp_list = g_list_append (temp_list, priv->child1);
2033           temp_list = g_list_append (temp_list, priv->last_child2_focus);
2034           temp_list = g_list_append (temp_list, priv->child2);
2035           temp_list = g_list_append (temp_list, ancestor);
2036         }
2037     }
2038   else
2039     {
2040       if (focus_child == priv->child1)
2041         {
2042           temp_list = g_list_append (temp_list, ancestor);
2043           temp_list = g_list_append (temp_list, priv->last_child2_focus);
2044           temp_list = g_list_append (temp_list, priv->child2);
2045         }
2046       else if (focus_child == priv->child2)
2047         {
2048           temp_list = g_list_append (temp_list, priv->last_child1_focus);
2049           temp_list = g_list_append (temp_list, priv->child1);
2050           temp_list = g_list_append (temp_list, ancestor);
2051         }
2052       else
2053         {
2054           temp_list = g_list_append (temp_list, priv->last_child2_focus);
2055           temp_list = g_list_append (temp_list, priv->child2);
2056           temp_list = g_list_append (temp_list, priv->last_child1_focus);
2057           temp_list = g_list_append (temp_list, priv->child1);
2058           temp_list = g_list_append (temp_list, ancestor);
2059         }
2060     }
2061
2062   /* Walk the list and expand all the paned widgets. */
2063   for (list = temp_list; list != NULL; list = list->next)
2064     {
2065       GtkWidget *widget = list->data;
2066
2067       if (widget)
2068         {
2069           if (GTK_IS_PANED (widget))
2070             {
2071               priv->in_recursion = TRUE;
2072               gtk_paned_get_cycle_chain (GTK_PANED (widget), direction, widgets);
2073               priv->in_recursion = FALSE;
2074             }
2075           else
2076             {
2077               *widgets = g_list_append (*widgets, widget);
2078             }
2079         }
2080     }
2081
2082   g_list_free (temp_list);
2083 }
2084
2085 static gboolean
2086 gtk_paned_cycle_child_focus (GtkPaned *paned,
2087                              gboolean  reversed)
2088 {
2089   GList *cycle_chain = NULL;
2090   GList *list;
2091
2092   GtkDirectionType direction = reversed? GTK_DIR_TAB_BACKWARD : GTK_DIR_TAB_FORWARD;
2093
2094   /* ignore f6 if the handle is focused */
2095   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
2096     return TRUE;
2097
2098   /* we can't just let the event propagate up the hierarchy,
2099    * because the paned will want to cycle focus _unless_ an
2100    * ancestor paned handles the event
2101    */
2102   gtk_paned_get_cycle_chain (paned, direction, &cycle_chain);
2103
2104   for (list = cycle_chain; list != NULL; list = list->next)
2105     if (gtk_widget_child_focus (GTK_WIDGET (list->data), direction))
2106       break;
2107
2108   g_list_free (cycle_chain);
2109
2110   return TRUE;
2111 }
2112
2113 static void
2114 get_child_panes (GtkWidget  *widget,
2115                  GList     **panes)
2116 {
2117   if (!widget || !gtk_widget_get_realized (widget))
2118     return;
2119
2120   if (GTK_IS_PANED (widget))
2121     {
2122       GtkPaned *paned = GTK_PANED (widget);
2123       GtkPanedPrivate *priv = paned->priv;
2124
2125       get_child_panes (priv->child1, panes);
2126       *panes = g_list_prepend (*panes, widget);
2127       get_child_panes (priv->child2, panes);
2128     }
2129   else if (GTK_IS_CONTAINER (widget))
2130     {
2131       gtk_container_forall (GTK_CONTAINER (widget),
2132                             (GtkCallback)get_child_panes, panes);
2133     }
2134 }
2135
2136 static GList *
2137 get_all_panes (GtkPaned *paned)
2138 {
2139   GtkPaned *topmost = NULL;
2140   GList *result = NULL;
2141   GtkWidget *w;
2142
2143   for (w = GTK_WIDGET (paned); w != NULL; w = gtk_widget_get_parent (w))
2144     {
2145       if (GTK_IS_PANED (w))
2146         topmost = GTK_PANED (w);
2147     }
2148
2149   g_assert (topmost);
2150
2151   get_child_panes (GTK_WIDGET (topmost), &result);
2152
2153   return g_list_reverse (result);
2154 }
2155
2156 static void
2157 gtk_paned_find_neighbours (GtkPaned  *paned,
2158                            GtkPaned **next,
2159                            GtkPaned **prev)
2160 {
2161   GList *all_panes;
2162   GList *this_link;
2163
2164   all_panes = get_all_panes (paned);
2165   g_assert (all_panes);
2166
2167   this_link = g_list_find (all_panes, paned);
2168
2169   g_assert (this_link);
2170
2171   if (this_link->next)
2172     *next = this_link->next->data;
2173   else
2174     *next = all_panes->data;
2175
2176   if (this_link->prev)
2177     *prev = this_link->prev->data;
2178   else
2179     *prev = g_list_last (all_panes)->data;
2180
2181   g_list_free (all_panes);
2182 }
2183
2184 static gboolean
2185 gtk_paned_move_handle (GtkPaned      *paned,
2186                        GtkScrollType  scroll)
2187 {
2188   GtkPanedPrivate *priv = paned->priv;
2189
2190   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
2191     {
2192       gint old_position;
2193       gint new_position;
2194       gint increment;
2195
2196       enum {
2197         SINGLE_STEP_SIZE = 1,
2198         PAGE_STEP_SIZE   = 75
2199       };
2200
2201       new_position = old_position = gtk_paned_get_position (paned);
2202       increment = 0;
2203
2204       switch (scroll)
2205         {
2206         case GTK_SCROLL_STEP_LEFT:
2207         case GTK_SCROLL_STEP_UP:
2208         case GTK_SCROLL_STEP_BACKWARD:
2209           increment = - SINGLE_STEP_SIZE;
2210           break;
2211
2212         case GTK_SCROLL_STEP_RIGHT:
2213         case GTK_SCROLL_STEP_DOWN:
2214         case GTK_SCROLL_STEP_FORWARD:
2215           increment = SINGLE_STEP_SIZE;
2216           break;
2217
2218         case GTK_SCROLL_PAGE_LEFT:
2219         case GTK_SCROLL_PAGE_UP:
2220         case GTK_SCROLL_PAGE_BACKWARD:
2221           increment = - PAGE_STEP_SIZE;
2222           break;
2223
2224         case GTK_SCROLL_PAGE_RIGHT:
2225         case GTK_SCROLL_PAGE_DOWN:
2226         case GTK_SCROLL_PAGE_FORWARD:
2227           increment = PAGE_STEP_SIZE;
2228           break;
2229
2230         case GTK_SCROLL_START:
2231           new_position = priv->min_position;
2232           break;
2233
2234         case GTK_SCROLL_END:
2235           new_position = priv->max_position;
2236           break;
2237
2238         default:
2239           break;
2240         }
2241
2242       if (increment)
2243         {
2244           if (is_rtl (paned))
2245             increment = -increment;
2246
2247           new_position = old_position + increment;
2248         }
2249
2250       new_position = CLAMP (new_position, priv->min_position, priv->max_position);
2251
2252       if (old_position != new_position)
2253         gtk_paned_set_position (paned, new_position);
2254
2255       return TRUE;
2256     }
2257
2258   return FALSE;
2259 }
2260
2261 static void
2262 gtk_paned_restore_focus (GtkPaned *paned)
2263 {
2264   GtkPanedPrivate *priv = paned->priv;
2265
2266   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
2267     {
2268       if (priv->saved_focus &&
2269           gtk_widget_get_sensitive (priv->saved_focus))
2270         {
2271           gtk_widget_grab_focus (priv->saved_focus);
2272         }
2273       else
2274         {
2275           /* the saved focus is somehow not available for focusing,
2276            * try
2277            *   1) tabbing into the paned widget
2278            * if that didn't work,
2279            *   2) unset focus for the window if there is one
2280            */
2281
2282           if (!gtk_widget_child_focus (GTK_WIDGET (paned), GTK_DIR_TAB_FORWARD))
2283             {
2284               GtkWidget *toplevel = gtk_widget_get_toplevel (GTK_WIDGET (paned));
2285
2286               if (GTK_IS_WINDOW (toplevel))
2287                 gtk_window_set_focus (GTK_WINDOW (toplevel), NULL);
2288             }
2289         }
2290
2291       gtk_paned_set_saved_focus (paned, NULL);
2292       gtk_paned_set_first_paned (paned, NULL);
2293     }
2294 }
2295
2296 static gboolean
2297 gtk_paned_accept_position (GtkPaned *paned)
2298 {
2299   GtkPanedPrivate *priv = paned->priv;
2300
2301   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
2302     {
2303       priv->original_position = -1;
2304       gtk_paned_restore_focus (paned);
2305
2306       return TRUE;
2307     }
2308
2309   return FALSE;
2310 }
2311
2312
2313 static gboolean
2314 gtk_paned_cancel_position (GtkPaned *paned)
2315 {
2316   GtkPanedPrivate *priv = paned->priv;
2317
2318   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
2319     {
2320       if (priv->original_position != -1)
2321         {
2322           gtk_paned_set_position (paned, priv->original_position);
2323           priv->original_position = -1;
2324         }
2325
2326       gtk_paned_restore_focus (paned);
2327       return TRUE;
2328     }
2329
2330   return FALSE;
2331 }
2332
2333 static gboolean
2334 gtk_paned_cycle_handle_focus (GtkPaned *paned,
2335                               gboolean  reversed)
2336 {
2337   GtkPanedPrivate *priv = paned->priv;
2338   GtkPaned *next, *prev;
2339
2340   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
2341     {
2342       GtkPaned *focus = NULL;
2343
2344       if (!priv->first_paned)
2345         {
2346           /* The first_pane has disappeared. As an ad-hoc solution,
2347            * we make the currently focused paned the first_paned. To the
2348            * user this will seem like the paned cycling has been reset.
2349            */
2350
2351           gtk_paned_set_first_paned (paned, paned);
2352         }
2353
2354       gtk_paned_find_neighbours (paned, &next, &prev);
2355
2356       if (reversed && prev &&
2357           prev != paned && paned != priv->first_paned)
2358         {
2359           focus = prev;
2360         }
2361       else if (!reversed && next &&
2362                next != paned && next != priv->first_paned)
2363         {
2364           focus = next;
2365         }
2366       else
2367         {
2368           gtk_paned_accept_position (paned);
2369           return TRUE;
2370         }
2371
2372       g_assert (focus);
2373
2374       gtk_paned_set_saved_focus (focus, priv->saved_focus);
2375       gtk_paned_set_first_paned (focus, priv->first_paned);
2376
2377       gtk_paned_set_saved_focus (paned, NULL);
2378       gtk_paned_set_first_paned (paned, NULL);
2379
2380       gtk_widget_grab_focus (GTK_WIDGET (focus));
2381
2382       if (!gtk_widget_is_focus (GTK_WIDGET (paned)))
2383         {
2384           priv->original_position = -1;
2385           focus->priv->original_position = gtk_paned_get_position (focus);
2386         }
2387     }
2388   else
2389     {
2390       GtkContainer *container = GTK_CONTAINER (paned);
2391       GtkPaned *focus;
2392       GtkPaned *first;
2393       GtkPaned *prev, *next;
2394       GtkWidget *toplevel;
2395       GtkWidget *focus_child;
2396
2397       gtk_paned_find_neighbours (paned, &next, &prev);
2398       focus_child = gtk_container_get_focus_child (container);
2399
2400       if (focus_child == priv->child1)
2401         {
2402           if (reversed)
2403             {
2404               focus = prev;
2405               first = paned;
2406             }
2407           else
2408             {
2409               focus = paned;
2410               first = paned;
2411             }
2412         }
2413       else if (focus_child == priv->child2)
2414         {
2415           if (reversed)
2416             {
2417               focus = paned;
2418               first = next;
2419             }
2420           else
2421             {
2422               focus = next;
2423               first = next;
2424             }
2425         }
2426       else
2427         {
2428           /* Focus is not inside this paned, and we don't have focus.
2429            * Presumably this happened because the application wants us
2430            * to start keyboard navigating.
2431            */
2432           focus = paned;
2433
2434           if (reversed)
2435             first = paned;
2436           else
2437             first = next;
2438         }
2439
2440       toplevel = gtk_widget_get_toplevel (GTK_WIDGET (paned));
2441
2442       if (GTK_IS_WINDOW (toplevel))
2443         gtk_paned_set_saved_focus (focus, gtk_window_get_focus (GTK_WINDOW (toplevel)));
2444       gtk_paned_set_first_paned (focus, first);
2445       focus->priv->original_position = gtk_paned_get_position (focus);
2446
2447       gtk_widget_grab_focus (GTK_WIDGET (focus));
2448    }
2449
2450   return TRUE;
2451 }
2452
2453 static gboolean
2454 gtk_paned_toggle_handle_focus (GtkPaned *paned)
2455 {
2456   /* This function/signal has the wrong name. It is called when you
2457    * press Tab or Shift-Tab and what we do is act as if
2458    * the user pressed Return and then Tab or Shift-Tab
2459    */
2460   if (gtk_widget_is_focus (GTK_WIDGET (paned)))
2461     gtk_paned_accept_position (paned);
2462
2463   return FALSE;
2464 }
2465
2466 /**
2467  * gtk_paned_get_handle_window:
2468  * @paned: a #GtkPaned
2469  *
2470  * Returns the #GdkWindow of the handle. This function is
2471  * useful when handling button or motion events because it
2472  * enables the callback to distinguish between the window
2473  * of the paned, a child and the handle.
2474  *
2475  * Return value: (transfer none): the paned's handle window.
2476  *
2477  * Since: 2.20
2478  **/
2479 GdkWindow *
2480 gtk_paned_get_handle_window (GtkPaned *paned)
2481 {
2482   g_return_val_if_fail (GTK_IS_PANED (paned), NULL);
2483
2484   return paned->priv->handle;
2485 }