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

   1 /* GTK - The GIMP Toolkit
   2  *
   3  * Copyright (C) 2003 Sun Microsystems, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Authors:
  21  *      Mark McLoughlin <mark@skynet.ie>
  22  */
  23
  24 #include <config.h>
  25
  26 #include "gtkexpander.h"
  27
  28 #include "gtklabel.h"
  29 #include "gtkcontainer.h"
  30 #include "gtkmarshalers.h"
  31 #include "gtkmain.h"
  32 #include "gtkintl.h"
  33 #include "gtkprivate.h"
  34 #include <gdk/gdkkeysyms.h>
  35
  36 #define GTK_EXPANDER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GTK_TYPE_EXPANDER, GtkExpanderPrivate))
  37
  38 #define DEFAULT_EXPANDER_SIZE 10
  39 #define DEFAULT_EXPANDER_SPACING 2
  40
  41 enum
  42 {
  43   PROP_0,
  44   PROP_EXPANDED,
  45   PROP_LABEL,
  46   PROP_USE_UNDERLINE,
  47   PROP_PADDING,
  48   PROP_LABEL_WIDGET
  49 };
  50
  51 struct _GtkExpanderPrivate
  52 {
  53   GtkWidget        *label_widget;
  54   GdkWindow        *event_window;
  55   gint              spacing;
  56
  57   GtkExpanderStyle  expander_style;
  58   guint             animation_timeout;
  59
  60   guint             expanded : 1;
  61   guint             use_underline : 1;
  62   guint             button_down : 1;
  63   guint             prelight : 1;
  64 };
  65
  66 static void gtk_expander_class_init (GtkExpanderClass *klass);
  67 static void gtk_expander_init       (GtkExpander      *expander);
  68
  69 static void gtk_expander_set_property (GObject          *object,
  70                                        guint             prop_id,
  71                                        const GValue     *value,
  72                                        GParamSpec       *pspec);
  73 static void gtk_expander_get_property (GObject          *object,
  74                                        guint             prop_id,
  75                                        GValue           *value,
  76                                        GParamSpec       *pspec);
  77
  78 static void     gtk_expander_realize        (GtkWidget        *widget);
  79 static void     gtk_expander_unrealize      (GtkWidget        *widget);
  80 static void     gtk_expander_size_request   (GtkWidget        *widget,
  81                                              GtkRequisition   *requisition);
  82 static void     gtk_expander_size_allocate  (GtkWidget        *widget,
  83                                              GtkAllocation    *allocation);
  84 static void     gtk_expander_map            (GtkWidget        *widget);
  85 static void     gtk_expander_unmap          (GtkWidget        *widget);
  86 static gboolean gtk_expander_expose         (GtkWidget        *widget,
  87                                              GdkEventExpose   *event);
  88 static gboolean gtk_expander_button_press   (GtkWidget        *widget,
  89                                              GdkEventButton   *event);
  90 static gboolean gtk_expander_button_release (GtkWidget        *widget,
  91                                              GdkEventButton   *event);
  92 static gboolean gtk_expander_enter_notify   (GtkWidget        *widget,
  93                                              GdkEventCrossing *event);
  94 static gboolean gtk_expander_leave_notify   (GtkWidget        *widget,
  95                                              GdkEventCrossing *event);
  96 static gboolean gtk_expander_focus          (GtkWidget        *widget,
  97                                              GtkDirectionType  direction);
  98 static void     gtk_expander_grab_notify    (GtkWidget        *widget,
  99                                              gboolean          was_grabbed);
 100 static void     gtk_expander_state_changed  (GtkWidget        *widget,
 101                                              GtkStateType      previous_state);
 102
 103 static void gtk_expander_add    (GtkContainer *container,
 104                                  GtkWidget    *widget);
 105 static void gtk_expander_remove (GtkContainer *container,
 106                                  GtkWidget    *widget);
 107 static void gtk_expander_forall (GtkContainer *container,
 108                                  gboolean        include_internals,
 109                                  GtkCallback     callback,
 110                                  gpointer        callback_data);
 111
 112 static void gtk_expander_activate (GtkExpander *expander);
 113
 114 static GtkBinClass *parent_class = NULL;
 115
 116 GType
 117 gtk_expander_get_type (void)
 118 {
 119   static GType expander_type = 0;
 120
 121   if (!expander_type)
 122     {
 123       static const GTypeInfo expander_info =
 124       {
 125         sizeof (GtkExpanderClass),
 126         NULL,           /* base_init */
 127         NULL,           /* base_finalize */
 128         (GClassInitFunc) gtk_expander_class_init,
 129         NULL,           /* class_finalize */
 130         NULL,           /* class_data */
 131         sizeof (GtkExpander),
 132         0,              /* n_preallocs */
 133         (GInstanceInitFunc) gtk_expander_init,
 134       };
 135
 136       expander_type = g_type_register_static (GTK_TYPE_BIN,
 137                                               "GtkExpander",
 138                                               &expander_info, 0);
 139     }
 140
 141   return expander_type;
 142 }
 143
 144 static void
 145 gtk_expander_class_init (GtkExpanderClass *klass)
 146 {
 147   GObjectClass *gobject_class;
 148   GtkWidgetClass *widget_class;
 149   GtkContainerClass *container_class;
 150
 151   parent_class = g_type_class_peek_parent (klass);
 152
 153   gobject_class   = (GObjectClass *) klass;
 154   widget_class    = (GtkWidgetClass *) klass;
 155   container_class = (GtkContainerClass *) klass;
 156
 157   gobject_class->set_property = gtk_expander_set_property;
 158   gobject_class->get_property = gtk_expander_get_property;
 159
 160   widget_class->realize              = gtk_expander_realize;
 161   widget_class->unrealize            = gtk_expander_unrealize;
 162   widget_class->size_request         = gtk_expander_size_request;
 163   widget_class->size_allocate        = gtk_expander_size_allocate;
 164   widget_class->map                  = gtk_expander_map;
 165   widget_class->unmap                = gtk_expander_unmap;
 166   widget_class->expose_event         = gtk_expander_expose;
 167   widget_class->button_press_event   = gtk_expander_button_press;
 168   widget_class->button_release_event = gtk_expander_button_release;
 169   widget_class->enter_notify_event   = gtk_expander_enter_notify;
 170   widget_class->leave_notify_event   = gtk_expander_leave_notify;
 171   widget_class->focus                = gtk_expander_focus;
 172   widget_class->grab_notify          = gtk_expander_grab_notify;
 173   widget_class->state_changed        = gtk_expander_state_changed;
 174
 175   container_class->add    = gtk_expander_add;
 176   container_class->remove = gtk_expander_remove;
 177   container_class->forall = gtk_expander_forall;
 178
 179   klass->activate = gtk_expander_activate;
 180
 181   g_type_class_add_private (klass, sizeof (GtkExpanderPrivate));
 182
 183   g_object_class_install_property (gobject_class,
 184                                    PROP_EXPANDED,
 185                                    g_param_spec_boolean ("expanded",
 186                                                          _("Expanded"),
 187                                                          _("Whether the expander has been opened to reveal the child widget"),
 188                                                          FALSE,
 189                                                          G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 190
 191   g_object_class_install_property (gobject_class,
 192                                    PROP_LABEL,
 193                                    g_param_spec_string ("label",
 194                                                         _("Label"),
 195                                                         _("Text of the expander's label"),
 196                                                         NULL,
 197                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 198
 199   g_object_class_install_property (gobject_class,
 200                                    PROP_USE_UNDERLINE,
 201                                    g_param_spec_boolean ("use_underline",
 202                                                          _("Use underline"),
 203                                                          _("If set, an underline in the text indicates the next character should be used for the mnemonic accelerator key"),
 204                                                          FALSE,
 205                                                          G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 206
 207   g_object_class_install_property (gobject_class,
 208                                    PROP_PADDING,
 209                                    g_param_spec_int ("spacing",
 210                                                      _("Spacing"),
 211                                                      _("Space to put between the label and the child"),
 212                                                      0,
 213                                                      G_MAXINT,
 214                                                      0,
 215                                                      G_PARAM_READWRITE));
 216
 217   g_object_class_install_property (gobject_class,
 218                                    PROP_LABEL_WIDGET,
 219                                    g_param_spec_object ("label_widget",
 220                                                         _("Label widget"),
 221                                                         _("A widget to display in place of the usual expander label"),
 222                                                         GTK_TYPE_WIDGET,
 223                                                         G_PARAM_READWRITE));
 224
 225   gtk_widget_class_install_style_property (widget_class,
 226                                            g_param_spec_int ("expander-size",
 227                                                              _("Expander Size"),
 228                                                              _("Size of the expander arrow"),
 229                                                              0,
 230                                                              G_MAXINT,
 231                                                              DEFAULT_EXPANDER_SIZE,
 232                                                              G_PARAM_READABLE));
 233
 234   gtk_widget_class_install_style_property (widget_class,
 235                                            g_param_spec_int ("expander-spacing",
 236                                                              _("Indicator Spacing"),
 237                                                              _("Spacing around expander arrow"),
 238                                                              0,
 239                                                              G_MAXINT,
 240                                                              DEFAULT_EXPANDER_SPACING,
 241                                                              G_PARAM_READABLE));
 242
 243   widget_class->activate_signal =
 244     g_signal_new ("activate",
 245                   G_TYPE_FROM_CLASS (gobject_class),
 246                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 247                   G_STRUCT_OFFSET (GtkExpanderClass, activate),
 248                   NULL, NULL,
 249                   _gtk_marsha  /**
 250
 251 l_VOID__VOID,
 252                   G_TYPE_NONE, 0);
 253 }
 254
 255 static void
 256 gtk_expander_init (GtkExpander *expander)
 257 {
 258   GtkExpanderPrivate *priv;
 259
 260   expander->priv = priv = GTK_EXPANDER_GET_PRIVATE (expander);
 261
 262   GTK_WIDGET_SET_FLAGS (expander, GTK_CAN_FOCUS);
 263   GTK_WIDGET_SET_FLAGS (expander, GTK_NO_WINDOW);
 264
 265   priv->label_widget = NULL;
 266   priv->event_window = NULL;
 267   priv->spacing = 0;
 268
 269   priv->expander_style = GTK_EXPANDER_COLLAPSED;
 270   priv->animation_timeout = 0;
 271
 272   priv->expanded = FALSE;
 273   priv->use_underline = FALSE;
 274   priv->button_down = FALSE;
 275   priv->prelight = FALSE;
 276 }
 277
 278 static void
 279 gtk_expander_set_property (GObject      *object,
 280                            guint         prop_id,
 281                            const GValue *value,
 282                            GParamSpec   *pspec)
 283 {
 284   GtkExpander *expander = GTK_EXPANDER (object);
 285
 286   switch (prop_id)
 287     {
 288     case PROP_EXPANDED:
 289       gtk_expander_set_expanded (expander, g_value_get_boolean (value));
 290       break;
 291     case PROP_LABEL:
 292       gtk_expander_set_label (expander, g_value_get_string (value));
 293       break;
 294     case PROP_USE_UNDERLINE:
 295       gtk_expander_set_use_underline (expander, g_value_get_boolean (value));
 296       break;
 297     case PROP_PADDING:
 298       gtk_expander_set_spacing (expander, g_value_get_int (value));
 299       break;
 300     case PROP_LABEL_WIDGET:
 301       gtk_expander_set_label_widget (expander, g_value_get_object (value));
 302       break;
 303     default:
 304       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 305       break;
 306     }
 307 }
 308
 309 static void
 310 gtk_expander_get_property (GObject    *object,
 311                            guint       prop_id,
 312                            GValue     *value,
 313                            GParamSpec *pspec)
 314 {
 315   GtkExpander *expander = GTK_EXPANDER (object);
 316   GtkExpanderPrivate *priv = expander->priv;
 317
 318   switch (prop_id)
 319     {
 320     case PROP_EXPANDED:
 321       g_value_set_boolean (value, priv->expanded);
 322       break;
 323     case PROP_LABEL:
 324       g_value_set_string (value, gtk_expander_get_label (expander));
 325       break;
 326     case PROP_USE_UNDERLINE:
 327       g_value_set_boolean (value, priv->use_underline);
 328       break;
 329     case PROP_PADDING:
 330       g_value_set_int (value, priv->spacing);
 331       break;
 332     case PROP_LABEL_WIDGET:
 333       g_value_set_object (value,
 334                           priv->label_widget ?
 335                           G_OBJECT (priv->label_widget) : NULL);
 336       break;
 337     default:
 338       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 339       break;
 340     }
 341 }
 342
 343 static void
 344 gtk_expander_realize (GtkWidget *widget)
 345 {
 346   GtkExpanderPrivate *priv;
 347   GdkWindowAttr attributes;
 348   gint attributes_mask;
 349   gint border_width;
 350
 351   priv = GTK_EXPANDER (widget)->priv;
 352   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 353
 354   border_width = GTK_CONTAINER (widget)->border_width;
 355
 356   attributes.window_type = GDK_WINDOW_CHILD;
 357   attributes.x = widget->allocation.x + border_width;
 358   attributes.y = widget->allocation.y + border_width;
 359   attributes.width = widget->allocation.width - 2 * border_width;
 360   attributes.height = widget->allocation.height - 2 * border_width;
 361   attributes.wclass = GDK_INPUT_ONLY;
 362   attributes.event_mask = gtk_widget_get_events (widget)     |
 363                                 GDK_EXPOSURE_MASK            |
 364                                 GDK_BUTTON_PRESS_MASK        |
 365                                 GDK_BUTTON_RELEASE_MASK      |
 366                                 GDK_ENTER_NOTIFY_MASK        |
 367                                 GDK_LEAVE_NOTIFY_MASK;
 368
 369   attributes_mask = GDK_WA_X | GDK_WA_Y;
 370
 371   widget->window = gtk_widget_get_parent_window (widget);
 372   g_object_ref (widget->window);
 373
 374   priv->event_window = gdk_window_new (gtk_widget_get_parent_window (widget),
 375                                        &attributes, attributes_mask);
 376   gdk_window_set_user_data (priv->event_window, widget);
 377
 378   widget->style = gtk_style_attach (widget->style, widget->window);
 379   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 380 }
 381
 382 static void
 383 gtk_expander_unrealize (GtkWidget *widget)
 384 {
 385   GtkExpanderPrivate *priv = GTK_EXPANDER (widget)->priv;
 386
 387   if (priv->event_window)
 388     {
 389       gdk_window_set_user_data (priv->event_window, NULL);
 390       gdk_window_destroy (priv->event_window);
 391       priv->event_window = NULL;
 392     }
 393
 394   if (priv->animation_timeout)
 395     {
 396       g_source_remove (priv->animation_timeout);
 397       priv->animation_timeout = 0;
 398     }
 399
 400   GTK_WIDGET_CLASS (parent_class)->unrealize (widget);
 401 }
 402
 403 static void
 404 gtk_expander_size_request (GtkWidget      *widget,
 405                            GtkRequisition *requisition)
 406 {
 407   GtkExpander *expander;
 408   GtkBin *bin;
 409   GtkExpanderPrivate *priv;
 410   gint border_width;
 411   gint expander_size;
 412   gint expander_spacing;
 413   gboolean interior_focus;
 414   gint focus_width;
 415   gint focus_pad;
 416
 417   bin = GTK_BIN (widget);
 418   expander = GTK_EXPANDER (widget);
 419   priv = expander->priv;
 420
 421   border_width = GTK_CONTAINER (widget)->border_width;
 422
 423   gtk_widget_style_get (widget,
 424                         "interior-focus", &interior_focus,
 425                         "focus-line-width", &focus_width,
 426                         "focus-padding", &focus_pad,
 427                         "expander-size", &expander_size,
 428                         "expander-spacing", &expander_spacing,
 429                         NULL);
 430
 431   requisition->width = expander_size + 2 * expander_spacing +
 432                        2 * focus_width + 2 * focus_pad;
 433   requisition->height = interior_focus ? (2 * focus_width + 2 * focus_pad) : 0;
 434
 435   if (priv->label_widget && GTK_WIDGET_VISIBLE (priv->label_widget))
 436     {
 437       GtkRequisition label_requisition;
 438
 439       gtk_widget_size_request (priv->label_widget, &label_requisition);
 440
 441       requisition->width  += label_requisition.width;
 442       requisition->height += label_requisition.height;
 443     }
 444
 445   requisition->height = MAX (expander_size + 2 * expander_spacing, requisition->height);
 446
 447   if (!interior_focus)
 448     requisition->height += 2 * focus_width + 2 * focus_pad;
 449
 450   if (bin->child && GTK_WIDGET_CHILD_VISIBLE (bin->child))
 451     {
 452       GtkRequisition child_requisition;
 453
 454       gtk_widget_size_request (bin->child, &child_requisition);
 455
 456       requisition->width = MAX (requisition->width, child_requisition.width);
 457       requisition->height += child_requisition.height + priv->spacing;
 458     }
 459
 460   requisition->width  += 2 * border_width;
 461   requisition->height += 2 * border_width;
 462 }
 463
 464 static void
 465 get_expander_bounds (GtkExpander  *expander,
 466                      GdkRectangle *rect)
 467 {
 468   GtkWidget *widget;
 469   GtkBin *bin;
 470   GtkExpanderPrivate *priv;
 471   gint border_width;
 472   gint expander_size;
 473   gint expander_spacing;
 474   gboolean interior_focus;
 475   gint focus_width;
 476   gint focus_pad;
 477   gboolean ltr;
 478
 479   widget = GTK_WIDGET (expander);
 480   bin = GTK_BIN (expander);
 481   priv = expander->priv;
 482
 483   border_width = GTK_CONTAINER (expander)->border_width;
 484
 485   gtk_widget_style_get (widget,
 486                         "interior-focus", &interior_focus,
 487                         "focus-line-width", &focus_width,
 488                         "focus-padding", &focus_pad,
 489                         "expander-size", &expander_size,
 490                         "expander-spacing", &expander_spacing,
 491                         NULL);
 492
 493   ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 494
 495   rect->x = widget->allocation.x + border_width;
 496   rect->y = widget->allocation.y + border_width;
 497
 498   if (ltr)
 499     rect->x += expander_spacing;
 500   else
 501     rect->x += widget->allocation.width - 2 * border_width -
 502                expander_spacing - expander_size;
 503
 504   if (priv->label_widget && GTK_WIDGET_VISIBLE (priv->label_widget))
 505     {
 506       GtkAllocation label_allocation;
 507
 508       label_allocation = priv->label_widget->allocation;
 509
 510       if (expander_size < label_allocation.height)
 511         rect->y += focus_width + focus_pad + (label_allocation.height - expander_size) / 2;
 512       else
 513         rect->y += expander_spacing;
 514     }
 515   else
 516     {
 517       rect->y += expander_spacing;
 518     }
 519
 520   if (!interior_focus)
 521     {
 522       if (ltr)
 523         rect->x += focus_width + focus_pad;
 524       else
 525         rect->x -= focus_width + focus_pad;
 526       rect->y += focus_width + focus_pad;
 527     }
 528
 529   rect->width = rect->height = expander_size;
 530 }
 531
 532 static void
 533 gtk_expander_size_allocate (GtkWidget     *widget,
 534                             GtkAllocation *allocation)
 535 {
 536   GtkExpander *expander;
 537   GtkBin *bin;
 538   GtkExpanderPrivate *priv;
 539   GtkRequisition child_requisition;
 540   gboolean child_visible = FALSE;
 541   gint border_width;
 542   gint expander_size;
 543   gint expander_spacing;
 544   gboolean interior_focus;
 545   gint focus_width;
 546   gint focus_pad;
 547   gint label_height;
 548
 549   expander = GTK_EXPANDER (widget);
 550   bin = GTK_BIN (widget);
 551   priv = expander->priv;
 552
 553   border_width = GTK_CONTAINER (widget)->border_width;
 554
 555   gtk_widget_style_get (widget,
 556                         "interior-focus", &interior_focus,
 557                         "focus-line-width", &focus_width,
 558                         "focus-padding", &focus_pad,
 559                         "expander-size", &expander_size,
 560                         "expander-spacing", &expander_spacing,
 561                         NULL);
 562
 563   child_requisition.width = 0;
 564   child_requisition.height = 0;
 565   if (bin->child && GTK_WIDGET_CHILD_VISIBLE (bin->child))
 566     {
 567       child_visible = TRUE;
 568       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 569     }
 570
 571   widget->allocation = *allocation;
 572
 573   if (priv->label_widget && GTK_WIDGET_VISIBLE (priv->label_widget))
 574     {
 575       GtkAllocation label_allocation;
 576       GtkRequisition label_requisition;
 577       gboolean ltr;
 578
 579       gtk_widget_get_child_requisition (priv->label_widget, &label_requisition);
 580
 581       ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 582
 583       label_allocation.x = widget->allocation.x + border_width + focus_width + focus_pad;
 584       if (ltr)
 585         label_allocation.x += expander_size + 2 * expander_spacing;
 586       label_allocation.y = widget->allocation.y + border_width + focus_width + focus_pad;
 587
 588       label_allocation.width = MIN (label_requisition.width,
 589                                     allocation->width - 2 * border_width -
 590                                     expander_size - 2 * expander_spacing -
 591                                     2 * focus_width - 2 * focus_pad);
 592       label_allocation.width = MAX (label_allocation.width, 1);
 593
 594       label_allocation.height = MIN (label_requisition.height,
 595                                      allocation->height - 2 * border_width -
 596                                      2 * focus_width - 2 * focus_pad -
 597                                      (child_visible ? priv->spacing : 0));
 598       label_allocation.height = MAX (label_allocation.height, 1);
 599
 600       gtk_widget_size_allocate (priv->label_widget, &label_allocation);
 601
 602       label_height = label_allocation.height;
 603     }
 604   else
 605     {
 606       label_height = 0;
 607     }
 608
 609   if (GTK_WIDGET_REALIZED (widget))
 610     {
 611       GdkRectangle rect;
 612
 613       get_expander_bounds (expander, &rect);
 614
 615       gdk_window_move_resize (priv->event_window,
 616                               allocation->x + border_width, rect.y,
 617                               MAX (allocation->width - 2 * border_width, 1), rect.width);
 618     }
 619
 620   if (child_visible)
 621     {
 622       GtkAllocation child_allocation;
 623       gint top_height;
 624
 625       top_height = MAX (2 * expander_spacing + expander_size,
 626                         label_height +
 627                         (interior_focus ? 2 * focus_width + 2 * focus_pad : 0));
 628
 629       child_allocation.x = widget->allocation.x + border_width;
 630       child_allocation.y = widget->allocation.y + border_width + top_height + priv->spacing;
 631
 632       if (!interior_focus)
 633         child_allocation.y += 2 * focus_width + 2 * focus_pad;
 634
 635       child_allocation.width = MAX (allocation->width - 2 * border_width, 1);
 636
 637       child_allocation.height = allocation->height - top_height -
 638                                 2 * border_width - priv->spacing -
 639                                 (!interior_focus ? 2 * focus_width + 2 * focus_pad : 0);
 640       child_allocation.height = MAX (child_allocation.height, 1);
 641
 642       gtk_widget_size_allocate (bin->child, &child_allocation);
 643     }
 644 }
 645
 646 static void
 647 gtk_expander_map (GtkWidget *widget)
 648 {
 649   GtkExpanderPrivate *priv = GTK_EXPANDER (widget)->priv;
 650
 651   if (priv->label_widget)
 652     gtk_widget_map (priv->label_widget);
 653
 654   GTK_WIDGET_CLASS (parent_class)->map (widget);
 655
 656   if (priv->event_window)
 657     gdk_window_show (priv->event_window);
 658 }
 659
 660 static void
 661 gtk_expander_unmap (GtkWidget *widget)
 662 {
 663   GtkExpanderPrivate *priv = GTK_EXPANDER (widget)->priv;
 664
 665   if (priv->event_window)
 666     gdk_window_hide (priv->event_window);
 667
 668   GTK_WIDGET_CLASS (parent_class)->unmap (widget);
 669
 670   if (priv->label_widget)
 671     gtk_widget_unmap (priv->label_widget);
 672 }
 673
 674 static void
 675 gtk_expander_paint (GtkExpander *expander)
 676 {
 677   GtkWidget *widget;
 678   GdkRectangle clip;
 679   GtkStateType state;
 680
 681   widget = GTK_WIDGET (expander);
 682
 683   get_expander_bounds (expander, &clip);
 684
 685   state = widget->state;
 686   if (expander->priv->prelight)
 687     state = GTK_STATE_PRELIGHT;
 688
 689   gtk_paint_expander (widget->style,
 690                       widget->window,
 691                       state,
 692                       &clip,
 693                       widget,
 694                       "expander",
 695                       clip.x + clip.width / 2,
 696                       clip.y + clip.height / 2,
 697                       expander->priv->expander_style);
 698 }
 699
 700 static void
 701 gtk_expander_paint_focus (GtkExpander  *expander,
 702                           GdkRectangle *area)
 703 {
 704   GtkWidget *widget;
 705   GtkExpanderPrivate *priv;
 706   gint x, y, width, height;
 707   gboolean interior_focus;
 708   gint border_width;
 709   gint focus_width;
 710   gint focus_pad;
 711   gint expander_size;
 712   gint expander_spacing;
 713   gboolean ltr;
 714
 715   widget = GTK_WIDGET (expander);
 716   priv = expander->priv;
 717
 718   border_width = GTK_CONTAINER (widget)->border_width;
 719
 720   gtk_widget_style_get (widget,
 721                         "interior-focus", &interior_focus,
 722                         "focus-line-width", &focus_width,
 723                         "focus-padding", &focus_pad,
 724                         "expander-size", &expander_size,
 725                         "expander-spacing", &expander_spacing,
 726                         NULL);
 727
 728   ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 729
 730   x = widget->allocation.x + border_width;
 731   y = widget->allocation.y + border_width;
 732
 733   if (ltr && interior_focus)
 734     x += expander_spacing * 2 + expander_size;
 735
 736   width = height = 0;
 737
 738   if (priv->label_widget && GTK_WIDGET_VISIBLE (priv->label_widget))
 739     {
 740       GtkAllocation label_allocation = priv->label_widget->allocation;
 741
 742       width  = label_allocation.width;
 743       height = label_allocation.height;
 744     }
 745
 746   if (!interior_focus)
 747     {
 748       width += expander_size + 2 * expander_spacing;
 749       height = MAX (height, expander_size + 2 * expander_spacing);
 750     }
 751
 752   width  += 2 * focus_pad + 2 * focus_width;
 753   height += 2 * focus_pad + 2 * focus_width;
 754
 755   gtk_paint_focus (widget->style, widget->window, GTK_WIDGET_STATE (widget),
 756                    area, widget, "expander",
 757                    x, y, width, height);
 758 }
 759
 760 static gboolean
 761 gtk_expander_expose (GtkWidget      *widget,
 762                      GdkEventExpose *event)
 763 {
 764   if (GTK_WIDGET_DRAWABLE (widget))
 765     {
 766       GtkExpander *expander = GTK_EXPANDER (widget);
 767
 768       gtk_expander_paint (expander);
 769
 770       if (GTK_WIDGET_HAS_FOCUS (expander))
 771         gtk_expander_paint_focus (expander, &event->area);
 772
 773       if (expander->priv->label_widget)
 774         gtk_container_propagate_expose (GTK_CONTAINER (widget),
 775                                         expander->priv->label_widget,
 776                                         event);
 777
 778       GTK_WIDGET_CLASS (parent_class)->expose_event (widget, event);
 779     }
 780
 781   return FALSE;
 782 }
 783
 784 static gboolean
 785 gtk_expander_button_press (GtkWidget      *widget,
 786                            GdkEventButton *event)
 787 {
 788   GtkExpander *expander = GTK_EXPANDER (widget);
 789
 790   if (event->button == 1 && event->window == expander->priv->event_window)
 791     {
 792       expander->priv->button_down = TRUE;
 793       return TRUE;
 794     }
 795
 796   return FALSE;
 797 }
 798
 799 static gboolean
 800 gtk_expander_button_release (GtkWidget      *widget,
 801                              GdkEventButton *event)
 802 {
 803   GtkExpander *expander = GTK_EXPANDER (widget);
 804
 805   if (event->button == 1 && expander->priv->button_down)
 806     {
 807       gtk_expander_activate (expander);
 808       expander->priv->button_down = FALSE;
 809       return TRUE;
 810     }
 811
 812   return FALSE;
 813 }
 814
 815 static void
 816 gtk_expander_grab_notify (GtkWidget *widget,
 817                           gboolean   was_grabbed)
 818 {
 819   if (!was_grabbed)
 820     GTK_EXPANDER (widget)->priv->button_down = FALSE;
 821 }
 822
 823 static void
 824 gtk_expander_state_changed (GtkWidget    *widget,
 825                             GtkStateType  previous_state)
 826 {
 827   if (!GTK_WIDGET_IS_SENSITIVE (widget))
 828     GTK_EXPANDER (widget)->priv->button_down = FALSE;
 829 }
 830
 831 static void
 832 gtk_expander_redraw_expander (GtkExpander *expander)
 833 {
 834   GdkRectangle bounds;
 835
 836   get_expander_bounds (expander, &bounds);
 837
 838   gtk_widget_queue_draw_area (GTK_WIDGET (expander),
 839                               bounds.x,
 840                               bounds.y,
 841                               bounds.width,
 842                               bounds.height);
 843 }
 844
 845 static gboolean
 846 gtk_expander_enter_notify (GtkWidget        *widget,
 847                            GdkEventCrossing *event)
 848 {
 849   GtkExpander *expander = GTK_EXPANDER (widget);
 850   GtkWidget *event_widget;
 851
 852   event_widget = gtk_get_event_widget ((GdkEvent *) event);
 853
 854   if (event_widget == widget &&
 855       event->detail != GDK_NOTIFY_INFERIOR)
 856     {
 857       expander->priv->prelight = TRUE;
 858       gtk_expander_redraw_expander (expander);
 859     }
 860
 861   return FALSE;
 862 }
 863
 864 static gboolean
 865 gtk_expander_leave_notify (GtkWidget        *widget,
 866                            GdkEventCrossing *event)
 867 {
 868   GtkExpander *expander = GTK_EXPANDER (widget);
 869   GtkWidget *event_widget;
 870
 871   event_widget = gtk_get_event_widget ((GdkEvent *) event);
 872
 873   if (event_widget == widget &&
 874       event->detail != GDK_NOTIFY_INFERIOR)
 875     {
 876       expander->priv->prelight = FALSE;
 877       gtk_expander_redraw_expander (expander);
 878     }
 879
 880   return FALSE;
 881 }
 882
 883 typedef enum
 884 {
 885   FOCUS_NONE,
 886   FOCUS_WIDGET,
 887   FOCUS_LABEL,
 888   FOCUS_CHILD
 889 } FocusSite;
 890
 891 static gboolean
 892 focus_current_site (GtkExpander      *expander,
 893                     GtkDirectionType  direction)
 894 {
 895   GtkWidget *current_focus;
 896
 897   current_focus = GTK_CONTAINER (expander)->focus_child;
 898
 899   if (!current_focus)
 900     return FALSE;
 901
 902   return gtk_widget_child_focus (current_focus, direction);
 903 }
 904
 905 static gboolean
 906 focus_in_site (GtkExpander      *expander,
 907                FocusSite         site,
 908                GtkDirectionType  direction)
 909 {
 910   switch (site)
 911     {
 912     case FOCUS_WIDGET:
 913       gtk_widget_grab_focus (GTK_WIDGET (expander));
 914       return TRUE;
 915     case FOCUS_LABEL:
 916       if (expander->priv->label_widget)
 917         return gtk_widget_child_focus (expander->priv->label_widget, direction);
 918       else
 919         return FALSE;
 920     case FOCUS_CHILD:
 921       {
 922         GtkWidget *child = gtk_bin_get_child (GTK_BIN (expander));
 923
 924         if (child && GTK_WIDGET_CHILD_VISIBLE (child))
 925           return gtk_widget_child_focus (child, direction);
 926         else
 927           return FALSE;
 928       }
 929     case FOCUS_NONE:
 930       break;
 931     }
 932
 933   g_assert_not_reached ();
 934   return FALSE;
 935 }
 936
 937 static FocusSite
 938 get_next_site (GtkExpander      *expander,
 939                FocusSite         site,
 940                GtkDirectionType  direction)
 941 {
 942   gboolean ltr;
 943
 944   ltr = gtk_widget_get_direction (GTK_WIDGET (expander)) != GTK_TEXT_DIR_RTL;
 945
 946   switch (site)
 947     {
 948     case FOCUS_NONE:
 949       switch (direction)
 950         {
 951         case GTK_DIR_TAB_BACKWARD:
 952         case GTK_DIR_LEFT:
 953         case GTK_DIR_UP:
 954           return FOCUS_CHILD;
 955         case GTK_DIR_TAB_FORWARD:
 956         case GTK_DIR_DOWN:
 957         case GTK_DIR_RIGHT:
 958           return FOCUS_WIDGET;
 959         }
 960     case FOCUS_WIDGET:
 961       switch (direction)
 962         {
 963         case GTK_DIR_TAB_BACKWARD:
 964         case GTK_DIR_UP:
 965           return FOCUS_NONE;
 966         case GTK_DIR_LEFT:
 967           return ltr ? FOCUS_NONE : FOCUS_LABEL;
 968         case GTK_DIR_TAB_FORWARD:
 969         case GTK_DIR_DOWN:
 970           return FOCUS_LABEL;
 971         case GTK_DIR_RIGHT:
 972           return ltr ? FOCUS_LABEL : FOCUS_NONE;
 973           break;
 974         }
 975     case FOCUS_LABEL:
 976       switch (direction)
 977         {
 978         case GTK_DIR_TAB_BACKWARD:
 979         case GTK_DIR_UP:
 980           return FOCUS_WIDGET;
 981         case GTK_DIR_LEFT:
 982           return ltr ? FOCUS_WIDGET : FOCUS_CHILD;
 983         case GTK_DIR_TAB_FORWARD:
 984         case GTK_DIR_DOWN:
 985           return FOCUS_CHILD;
 986         case GTK_DIR_RIGHT:
 987           return ltr ? FOCUS_CHILD : FOCUS_WIDGET;
 988           break;
 989         }
 990     case FOCUS_CHILD:
 991       switch (direction)
 992         {
 993         case GTK_DIR_TAB_BACKWARD:
 994         case GTK_DIR_LEFT:
 995         case GTK_DIR_UP:
 996           return FOCUS_LABEL;
 997         case GTK_DIR_TAB_FORWARD:
 998         case GTK_DIR_DOWN:
 999         case GTK_DIR_RIGHT:
1000           return FOCUS_NONE;
1001         }
1002     }
1003
1004   g_assert_not_reached ();
1005   return FOCUS_NONE;
1006 }
1007
1008 static gboolean
1009 gtk_expander_focus (GtkWidget        *widget,
1010                     GtkDirectionType  direction)
1011 {
1012   GtkExpander *expander = GTK_EXPANDER (widget);
1013
1014   if (!focus_current_site (expander, direction))
1015     {
1016       GtkWidget *old_focus_child;
1017       gboolean widget_is_focus;
1018       FocusSite site = FOCUS_NONE;
1019
1020       widget_is_focus = gtk_widget_is_focus (widget);
1021       old_focus_child = GTK_CONTAINER (widget)->focus_child;
1022
1023       if (old_focus_child && old_focus_child == expander->priv->label_widget)
1024         site = FOCUS_LABEL;
1025       else if (old_focus_child)
1026         site = FOCUS_CHILD;
1027       else if (widget_is_focus)
1028         site = FOCUS_WIDGET;
1029
1030       while ((site = get_next_site (expander, site, direction)) != FOCUS_NONE)
1031         {
1032           if (focus_in_site (expander, site, direction))
1033             return TRUE;
1034         }
1035
1036       return FALSE;
1037     }
1038
1039   return TRUE;
1040 }
1041
1042 static void
1043 gtk_expander_add (GtkContainer *container,
1044                   GtkWidget    *widget)
1045 {
1046   GTK_CONTAINER_CLASS (parent_class)->add (container, widget);
1047
1048   gtk_widget_set_child_visible (widget, GTK_EXPANDER (container)->priv->expanded);
1049   gtk_widget_queue_resize (GTK_WIDGET (container));
1050 }
1051
1052 static void
1053 gtk_expander_remove (GtkContainer *container,
1054                      GtkWidget    *widget)
1055 {
1056   GtkExpander *expander = GTK_EXPANDER (container);
1057
1058   if (GTK_EXPANDER (expander)->priv->label_widget == widget)
1059     gtk_expander_set_label_widget (expander, NULL);
1060   else
1061     GTK_CONTAINER_CLASS (parent_class)->remove (container, widget);
1062 }
1063
1064 static void
1065 gtk_expander_forall (GtkContainer *container,
1066                      gboolean      include_internals,
1067                      GtkCallback   callback,
1068                      gpointer      callback_data)
1069 {
1070   GtkBin *bin = GTK_BIN (container);
1071   GtkExpanderPrivate *priv = GTK_EXPANDER (container)->priv;
1072
1073   if (bin->child)
1074     (* callback) (bin->child, callback_data);
1075
1076   if (priv->label_widget)
1077     (* callback) (priv->label_widget, callback_data);
1078 }
1079
1080 static void
1081 gtk_expander_activate (GtkExpander *expander)
1082 {
1083   gtk_expander_set_expanded (expander, !expander->priv->expanded);
1084 }
1085
1086
1087 /**
1088  * gtk_expander_new:
1089  * @label: the text of the label
1090  *
1091  * Creates a new expander using @label as the text of the label.
1092  *
1093  * Return value: a new #GtkExpander widget.
1094  *
1095  * Since: 2.4
1096  **/
1097 GtkWidget *
1098 gtk_expander_new (const gchar *label)
1099 {
1100   return g_object_new (GTK_TYPE_EXPANDER, "label", label, NULL);
1101 }
1102
1103 /**
1104  * gtk_expander_new_with_mnemonic:
1105  * @label: the text of the label with an underscore in front of the
1106  *         mnemonic character
1107  *
1108  * Creates a new expander using @label as the text of the label.
1109  * If characters in @label are preceded by an underscore, they are underlined.
1110  * If you need a literal underscore character in a label, use '__' (two
1111  * underscores). The first underlined character represents a keyboard
1112  * accelerator called a mnemonic.
1113  * Pressing Alt and that key activates the button.
1114  *
1115  * Return value: a new #GtkExpander widget.
1116  *
1117  * Since: 2.4
1118  **/
1119 GtkWidget *
1120 gtk_expander_new_with_mnemonic (const gchar *label)
1121 {
1122   return g_object_new (GTK_TYPE_EXPANDER,
1123                        "label", label,
1124                        "use_underline", TRUE,
1125                        NULL);
1126 }
1127
1128 static gboolean
1129 gtk_expander_animation_timeout (GtkExpander *expander)
1130 {
1131   GtkExpanderPrivate *priv = expander->priv;
1132   GdkRectangle area;
1133   gboolean finish = FALSE;
1134
1135   if (GTK_WIDGET_REALIZED (expander))
1136     {
1137       get_expander_bounds (expander, &area);
1138       gdk_window_invalidate_rect (GTK_WIDGET (expander)->window, &area, TRUE);
1139     }
1140
1141   if (priv->expanded)
1142     {
1143       if (priv->expander_style == GTK_EXPANDER_COLLAPSED)
1144         {
1145           priv->expander_style = GTK_EXPANDER_SEMI_EXPANDED;
1146         }
1147       else
1148         {
1149           priv->expander_style = GTK_EXPANDER_EXPANDED;
1150           finish = TRUE;
1151         }
1152     }
1153   else
1154     {
1155       if (priv->expander_style == GTK_EXPANDER_EXPANDED)
1156         {
1157           priv->expander_style = GTK_EXPANDER_SEMI_COLLAPSED;
1158         }
1159       else
1160         {
1161           priv->expander_style = GTK_EXPANDER_COLLAPSED;
1162           finish = TRUE;
1163         }
1164     }
1165
1166   if (finish)
1167     {
1168       priv->animation_timeout = 0;
1169       gtk_widget_set_child_visible (GTK_BIN (expander)->child, priv->expanded);
1170       gtk_widget_queue_resize (GTK_WIDGET (expander));
1171     }
1172
1173   return !finish;
1174 }
1175
1176 static void
1177 gtk_expander_start_animation (GtkExpander *expander)
1178 {
1179   GtkExpanderPrivate *priv = expander->priv;
1180
1181   if (!GTK_WIDGET_REALIZED (expander))
1182     return;
1183
1184   if (priv->animation_timeout)
1185     g_source_remove (priv->animation_timeout);
1186
1187   priv->animation_timeout =
1188                 g_timeout_add (50,
1189                                (GSourceFunc) gtk_expander_animation_timeout,
1190                                expander);
1191 }
1192
1193 /**
1194  * gtk_expander_set_expanded:
1195  * @expander: a #GtkExpander
1196  * @expanded: whether the child widget is revealed
1197  *
1198  * Sets the state of the expander. Set to %TRUE, if you want
1199  * the child widget to be revealed, and %FALSE if you want the
1200  * child widget to be hidden.
1201  *
1202  * Since: 2.4
1203  **/
1204 void
1205 gtk_expander_set_expanded (GtkExpander *expander,
1206                            gboolean     expanded)
1207 {
1208   GtkExpanderPrivate *priv;
1209
1210   g_return_if_fail (GTK_IS_EXPANDER (expander));
1211
1212   priv = expander->priv;
1213
1214   expanded = expanded != FALSE;
1215
1216   if (priv->expanded != expanded)
1217     {
1218       priv->expanded = expanded;
1219
1220       if (GTK_WIDGET_VISIBLE (expander))
1221         gtk_expander_start_animation (expander);
1222
1223       else if (GTK_BIN (expander)->child)
1224         {
1225           priv->expander_style = expanded ? GTK_EXPANDER_EXPANDED :
1226                                             GTK_EXPANDER_COLLAPSED;
1227           gtk_widget_set_child_visible (GTK_BIN (expander)->child, priv->expanded);
1228           gtk_widget_queue_resize (GTK_WIDGET (expander));
1229         }
1230
1231       g_object_notify (G_OBJECT (expander), "expanded");
1232     }
1233 }
1234
1235 /**
1236  * gtk_expander_get_expanded:
1237  * @expander:a #GtkExpander
1238  *
1239  * Queries a #GtkExpander and returns its current state. Returns %TRUE
1240  * if the child widget is revealed.
1241  *
1242  * See gtk_expander_set_expanded().
1243  *
1244  * Return value: the current state of the expander.
1245  *
1246  * Since: 2.4
1247  **/
1248 gboolean
1249 gtk_expander_get_expanded (GtkExpander *expander)
1250 {
1251   g_return_val_if_fail (GTK_IS_EXPANDER (expander), FALSE);
1252
1253   return expander->priv->expanded;
1254 }
1255
1256 /**
1257  * gtk_expander_set_spacing:
1258  * @expander: a #GtkExpander
1259  * @spacing: distance between the expander and child in pixels.
1260  *
1261  * Sets the spacing field of @expander, which is the number of pixels to
1262  * place between expander and the child.
1263  *
1264  * Since: 2.4
1265  **/
1266 void
1267 gtk_expander_set_spacing (GtkExpander *expander,
1268                           gint         spacing)
1269 {
1270   g_return_if_fail (GTK_IS_EXPANDER (expander));
1271   g_return_if_fail (spacing >= 0);
1272
1273   if (expander->priv->spacing != spacing)
1274     {
1275       expander->priv->spacing = spacing;
1276
1277       gtk_widget_queue_resize (GTK_WIDGET (expander));
1278
1279       g_object_notify (G_OBJECT (expander), "spacing");
1280     }
1281 }
1282
1283 /**
1284  * gtk_expander_get_spacing:
1285  * @expander: a #GtkExpander
1286  *
1287  * Gets the value set by gtk_expander_set_spacing().
1288  *
1289  * Return value: spacing between the expander and child.
1290  *
1291  * Since: 2.4
1292  **/
1293 gint
1294 gtk_expander_get_spacing (GtkExpander *expander)
1295 {
1296   g_return_val_if_fail (GTK_IS_EXPANDER (expander), 0);
1297
1298   return expander->priv->spacing;
1299 }
1300
1301 /**
1302  * gtk_expander_set_label:
1303  * @expander: a #GtkExpander
1304  * @label: a string
1305  *
1306  * Sets the text of the label of the expander to @label.
1307  *
1308  * This will also clear any previously set labels.
1309  *
1310  * Since: 2.4
1311  **/
1312 void
1313 gtk_expander_set_label (GtkExpander *expander,
1314                         const gchar *label)
1315 {
1316   g_return_if_fail (GTK_IS_EXPANDER (expander));
1317
1318   if (!label)
1319     {
1320       gtk_expander_set_label_widget (expander, NULL);
1321     }
1322   else
1323     {
1324       GtkWidget *child;
1325
1326       child = gtk_label_new (label);
1327       gtk_label_set_use_underline (GTK_LABEL (child), expander->priv->use_underline);
1328       gtk_widget_show (child);
1329
1330       gtk_expander_set_label_widget (expander, child);
1331     }
1332
1333   g_object_notify (G_OBJECT (expander), "label");
1334 }
1335
1336 /**
1337  * gtk_expander_get_label:
1338  * @expander: a #GtkExpander
1339  *
1340  * Fetches the text from the label of the expander, as set by
1341  * gtk_expander_set_label(). If the label text has not
1342  * been set the return value will be %NULL. This will be the
1343  * case if you create an empty button with gtk_button_new() to
1344  * use as a container.
1345  *
1346  * Return value: The text of the label widget. This string is owned
1347  * by the widget and must not be modified or freed.
1348  *
1349  * Since: 2.4
1350  **/
1351 G_CONST_RETURN char *
1352 gtk_expander_get_label (GtkExpander *expander)
1353 {
1354   GtkExpanderPrivate *priv;
1355
1356   g_return_val_if_fail (GTK_IS_EXPANDER (expander), NULL);
1357
1358   priv = expander->priv;
1359
1360   if (priv->label_widget && GTK_IS_LABEL (priv->label_widget))
1361     return gtk_label_get_text (GTK_LABEL (priv->label_widget));
1362   else
1363     return NULL;
1364 }
1365
1366 /**
1367  * gtk_expander_set_use_underline:
1368  * @expander: a #GtkExpander
1369  * @use_underline: %TRUE if underlines in the text indicate mnemonics
1370  *
1371  * If true, an underline in the text of the expander label indicates
1372  * the next character should be used for the mnemonic accelerator key.
1373  *
1374  * Since: 2.4
1375  **/
1376 void
1377 gtk_expander_set_use_underline (GtkExpander *expander,
1378                                 gboolean     use_underline)
1379 {
1380   GtkExpanderPrivate *priv;
1381
1382   g_return_if_fail (GTK_IS_EXPANDER (expander));
1383
1384   priv = expander->priv;
1385
1386   use_underline = use_underline != FALSE;
1387
1388   if (priv->use_underline != use_underline)
1389     {
1390       priv->use_underline = use_underline;
1391
1392       if (priv->label_widget && GTK_IS_LABEL (priv->label_widget))
1393         gtk_label_set_use_underline (GTK_LABEL (priv->label_widget), use_underline);
1394
1395       g_object_notify (G_OBJECT (expander), "use_underline");
1396     }
1397 }
1398
1399 /**
1400  * gtk_expander_get_use_underline:
1401  * @expander: a #GtkExpander
1402  *
1403  * Returns whether an embedded underline in the expander label indicates a
1404  * mnemonic. See gtk_expander_set_use_underline().
1405  *
1406  * Return value: %TRUE if an embedded underline in the expander label
1407  *               indicates the mnemonic accelerator keys.
1408  *
1409  * Since: 2.4
1410  **/
1411 gboolean
1412 gtk_expander_get_use_underline (GtkExpander *expander)
1413 {
1414   g_return_val_if_fail (GTK_IS_EXPANDER (expander), FALSE);
1415
1416   return expander->priv->use_underline;
1417 }
1418
1419 /**
1420  * gtk_expander_set_label_widget:
1421  * @expander: a #GtkExpander
1422  * @label_widget: the new label widget
1423  *
1424  * Set the label widget for the expander. This is the widget
1425  * that will appear embedded alongside the expander arrow.
1426  *
1427  * Since: 2.4
1428  **/
1429 void
1430 gtk_expander_set_label_widget (GtkExpander *expander,
1431                                GtkWidget   *label_widget)
1432 {
1433   GtkExpanderPrivate *priv;
1434
1435   g_return_if_fail (GTK_IS_EXPANDER (expander));
1436   g_return_if_fail (label_widget == NULL || GTK_IS_WIDGET (label_widget));
1437   g_return_if_fail (label_widget == NULL || label_widget->parent == NULL);
1438
1439   priv = expander->priv;
1440
1441   if (priv->label_widget == label_widget)
1442     return;
1443
1444   if (priv->label_widget)
1445     gtk_widget_unparent (priv->label_widget);
1446
1447   priv->label_widget = label_widget;
1448
1449   if (label_widget)
1450     {
1451       priv->label_widget = label_widget;
1452       gtk_widget_set_parent (label_widget, GTK_WIDGET (expander));
1453     }
1454
1455   if (GTK_WIDGET_VISIBLE (expander))
1456     gtk_widget_queue_resize (GTK_WIDGET (expander));
1457
1458   g_object_freeze_notify (G_OBJECT (expander));
1459   g_object_notify (G_OBJECT (expander), "label_widget");
1460   g_object_notify (G_OBJECT (expander), "label");
1461   g_object_thaw_notify (G_OBJECT (expander));
1462 }
1463
1464 /**
1465  * gtk_expander_get_label_widget:
1466  * @expander: a #GtkExpander
1467  *
1468  * Retrieves the label widget for the frame. See
1469  * gtk_expander_set_label_widget().
1470  *
1471  * Return value: the label widget, or %NULL if there is none.
1472  *
1473  * Since: 2.4
1474  **/
1475 GtkWidget *
1476 gtk_expander_get_label_widget (GtkExpander *expander)
1477 {
1478   g_return_val_if_fail (GTK_IS_EXPANDER (expander), NULL);
1479
1480   return expander->priv->label_widget;
1481 }