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_marshal_VOID__VOID,
 250                   G_TYPE_NONE, 0);
 251 }
 252
 253 static void
 254 gtk_expander_init (GtkExpander *expander)
 255 {
 256   GtkExpanderPrivate *priv;
 257
 258   expander->priv = priv = GTK_EXPANDER_GET_PRIVATE (expander);
 259
 260   GTK_WIDGET_SET_FLAGS (expander, GTK_CAN_FOCUS);
 261   GTK_WIDGET_SET_FLAGS (expander, GTK_NO_WINDOW);
 262
 263   priv->label_widget = NULL;
 264   priv->event_window = NULL;
 265   priv->spacing = 0;
 266
 267   priv->expander_style = GTK_EXPANDER_COLLAPSED;
 268   priv->animation_timeout = 0;
 269
 270   priv->expanded = FALSE;
 271   priv->use_underline = FALSE;
 272   priv->button_down = FALSE;
 273   priv->prelight = FALSE;
 274 }
 275
 276 static void
 277 gtk_expander_set_property (GObject      *object,
 278                            guint         prop_id,
 279                            const GValue *value,
 280                            GParamSpec   *pspec)
 281 {
 282   GtkExpander *expander = GTK_EXPANDER (object);
 283
 284   switch (prop_id)
 285     {
 286     case PROP_EXPANDED:
 287       gtk_expander_set_expanded (expander, g_value_get_boolean (value));
 288       break;
 289     case PROP_LABEL:
 290       gtk_expander_set_label (expander, g_value_get_string (value));
 291       break;
 292     case PROP_USE_UNDERLINE:
 293       gtk_expander_set_use_underline (expander, g_value_get_boolean (value));
 294       break;
 295     case PROP_PADDING:
 296       gtk_expander_set_spacing (expander, g_value_get_int (value));
 297       break;
 298     case PROP_LABEL_WIDGET:
 299       gtk_expander_set_label_widget (expander, g_value_get_object (value));
 300       break;
 301     default:
 302       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 303       break;
 304     }
 305 }
 306
 307 static void
 308 gtk_expander_get_property (GObject    *object,
 309                            guint       prop_id,
 310                            GValue     *value,
 311                            GParamSpec *pspec)
 312 {
 313   GtkExpander *expander = GTK_EXPANDER (object);
 314   GtkExpanderPrivate *priv = expander->priv;
 315
 316   switch (prop_id)
 317     {
 318     case PROP_EXPANDED:
 319       g_value_set_boolean (value, priv->expanded);
 320       break;
 321     case PROP_LABEL:
 322       g_value_set_string (value, gtk_expander_get_label (expander));
 323       break;
 324     case PROP_USE_UNDERLINE:
 325       g_value_set_boolean (value, priv->use_underline);
 326       break;
 327     case PROP_PADDING:
 328       g_value_set_int (value, priv->spacing);
 329       break;
 330     case PROP_LABEL_WIDGET:
 331       g_value_set_object (value,
 332                           priv->label_widget ?
 333                           G_OBJECT (priv->label_widget) : NULL);
 334       break;
 335     default:
 336       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 337       break;
 338     }
 339 }
 340
 341 static void
 342 gtk_expander_realize (GtkWidget *widget)
 343 {
 344   GtkExpanderPrivate *priv;
 345   GdkWindowAttr attributes;
 346   gint attributes_mask;
 347   gint border_width;
 348
 349   priv = GTK_EXPANDER (widget)->priv;
 350   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 351
 352   border_width = GTK_CONTAINER (widget)->border_width;
 353
 354   attributes.window_type = GDK_WINDOW_CHILD;
 355   attributes.x = widget->allocation.x + border_width;
 356   attributes.y = widget->allocation.y + border_width;
 357   attributes.width = widget->allocation.width - 2 * border_width;
 358   attributes.height = widget->allocation.height - 2 * border_width;
 359   attributes.wclass = GDK_INPUT_ONLY;
 360   attributes.event_mask = gtk_widget_get_events (widget)     |
 361                                 GDK_BUTTON_PRESS_MASK        |
 362                                 GDK_BUTTON_RELEASE_MASK      |
 363                                 GDK_ENTER_NOTIFY_MASK        |
 364                                 GDK_LEAVE_NOTIFY_MASK;
 365
 366   attributes_mask = GDK_WA_X | GDK_WA_Y;
 367
 368   widget->window = gtk_widget_get_parent_window (widget);
 369   g_object_ref (widget->window);
 370
 371   priv->event_window = gdk_window_new (gtk_widget_get_parent_window (widget),
 372                                        &attributes, attributes_mask);
 373   gdk_window_set_user_data (priv->event_window, widget);
 374
 375   widget->style = gtk_style_attach (widget->style, widget->window);
 376   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 377 }
 378
 379 static void
 380 gtk_expander_unrealize (GtkWidget *widget)
 381 {
 382   GtkExpanderPrivate *priv = GTK_EXPANDER (widget)->priv;
 383
 384   if (priv->event_window)
 385     {
 386       gdk_window_set_user_data (priv->event_window, NULL);
 387       gdk_window_destroy (priv->event_window);
 388       priv->event_window = NULL;
 389     }
 390
 391   if (priv->animation_timeout)
 392     {
 393       g_source_remove (priv->animation_timeout);
 394       priv->animation_timeout = 0;
 395     }
 396
 397   GTK_WIDGET_CLASS (parent_class)->unrealize (widget);
 398 }
 399
 400 static void
 401 gtk_expander_size_request (GtkWidget      *widget,
 402                            GtkRequisition *requisition)
 403 {
 404   GtkExpander *expander;
 405   GtkBin *bin;
 406   GtkExpanderPrivate *priv;
 407   gint border_width;
 408   gint expander_size;
 409   gint expander_spacing;
 410   gboolean interior_focus;
 411   gint focus_width;
 412   gint focus_pad;
 413
 414   bin = GTK_BIN (widget);
 415   expander = GTK_EXPANDER (widget);
 416   priv = expander->priv;
 417
 418   border_width = GTK_CONTAINER (widget)->border_width;
 419
 420   gtk_widget_style_get (widget,
 421                         "interior-focus", &interior_focus,
 422                         "focus-line-width", &focus_width,
 423                         "focus-padding", &focus_pad,
 424                         "expander-size", &expander_size,
 425                         "expander-spacing", &expander_spacing,
 426                         NULL);
 427
 428   requisition->width = expander_size + 2 * expander_spacing +
 429                        2 * focus_width + 2 * focus_pad;
 430   requisition->height = interior_focus ? (2 * focus_width + 2 * focus_pad) : 0;
 431
 432   if (priv->label_widget && GTK_WIDGET_VISIBLE (priv->label_widget))
 433     {
 434       GtkRequisition label_requisition;
 435
 436       gtk_widget_size_request (priv->label_widget, &label_requisition);
 437
 438       requisition->width  += label_requisition.width;
 439       requisition->height += label_requisition.height;
 440     }
 441
 442   requisition->height = MAX (expander_size + 2 * expander_spacing, requisition->height);
 443
 444   if (!interior_focus)
 445     requisition->height += 2 * focus_width + 2 * focus_pad;
 446
 447   if (bin->child && GTK_WIDGET_CHILD_VISIBLE (bin->child))
 448     {
 449       GtkRequisition child_requisition;
 450
 451       gtk_widget_size_request (bin->child, &child_requisition);
 452
 453       requisition->width = MAX (requisition->width, child_requisition.width);
 454       requisition->height += child_requisition.height + priv->spacing;
 455     }
 456
 457   requisition->width  += 2 * border_width;
 458   requisition->height += 2 * border_width;
 459 }
 460
 461 static void
 462 get_expander_bounds (GtkExpander  *expander,
 463                      GdkRectangle *rect)
 464 {
 465   GtkWidget *widget;
 466   GtkBin *bin;
 467   GtkExpanderPrivate *priv;
 468   gint border_width;
 469   gint expander_size;
 470   gint expander_spacing;
 471   gboolean interior_focus;
 472   gint focus_width;
 473   gint focus_pad;
 474   gboolean ltr;
 475
 476   widget = GTK_WIDGET (expander);
 477   bin = GTK_BIN (expander);
 478   priv = expander->priv;
 479
 480   border_width = GTK_CONTAINER (expander)->border_width;
 481
 482   gtk_widget_style_get (widget,
 483                         "interior-focus", &interior_focus,
 484                         "focus-line-width", &focus_width,
 485                         "focus-padding", &focus_pad,
 486                         "expander-size", &expander_size,
 487                         "expander-spacing", &expander_spacing,
 488                         NULL);
 489
 490   ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 491
 492   rect->x = widget->allocation.x + border_width;
 493   rect->y = widget->allocation.y + border_width;
 494
 495   if (ltr)
 496     rect->x += expander_spacing;
 497   else
 498     rect->x += widget->allocation.width - 2 * border_width -
 499                expander_spacing - expander_size;
 500
 501   if (priv->label_widget && GTK_WIDGET_VISIBLE (priv->label_widget))
 502     {
 503       GtkAllocation label_allocation;
 504
 505       label_allocation = priv->label_widget->allocation;
 506
 507       if (expander_size < label_allocation.height)
 508         rect->y += focus_width + focus_pad + (label_allocation.height - expander_size) / 2;
 509       else
 510         rect->y += expander_spacing;
 511     }
 512   else
 513     {
 514       rect->y += expander_spacing;
 515     }
 516
 517   if (!interior_focus)
 518     {
 519       if (ltr)
 520         rect->x += focus_width + focus_pad;
 521       else
 522         rect->x -= focus_width + focus_pad;
 523       rect->y += focus_width + focus_pad;
 524     }
 525
 526   rect->width = rect->height = expander_size;
 527 }
 528
 529 static void
 530 gtk_expander_size_allocate (GtkWidget     *widget,
 531                             GtkAllocation *allocation)
 532 {
 533   GtkExpander *expander;
 534   GtkBin *bin;
 535   GtkExpanderPrivate *priv;
 536   GtkRequisition child_requisition;
 537   gboolean child_visible = FALSE;
 538   gint border_width;
 539   gint expander_size;
 540   gint expander_spacing;
 541   gboolean interior_focus;
 542   gint focus_width;
 543   gint focus_pad;
 544   gint label_height;
 545
 546   expander = GTK_EXPANDER (widget);
 547   bin = GTK_BIN (widget);
 548   priv = expander->priv;
 549
 550   border_width = GTK_CONTAINER (widget)->border_width;
 551
 552   gtk_widget_style_get (widget,
 553                         "interior-focus", &interior_focus,
 554                         "focus-line-width", &focus_width,
 555                         "focus-padding", &focus_pad,
 556                         "expander-size", &expander_size,
 557                         "expander-spacing", &expander_spacing,
 558                         NULL);
 559
 560   child_requisition.width = 0;
 561   child_requisition.height = 0;
 562   if (bin->child && GTK_WIDGET_CHILD_VISIBLE (bin->child))
 563     {
 564       child_visible = TRUE;
 565       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 566     }
 567
 568   widget->allocation = *allocation;
 569
 570   if (priv->label_widget && GTK_WIDGET_VISIBLE (priv->label_widget))
 571     {
 572       GtkAllocation label_allocation;
 573       GtkRequisition label_requisition;
 574       gboolean ltr;
 575
 576       gtk_widget_get_child_requisition (priv->label_widget, &label_requisition);
 577
 578       ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 579
 580       label_allocation.x = widget->allocation.x + border_width + focus_width + focus_pad;
 581       if (ltr)
 582         label_allocation.x += expander_size + 2 * expander_spacing;
 583       label_allocation.y = widget->allocation.y + border_width + focus_width + focus_pad;
 584
 585       label_allocation.width = MIN (label_requisition.width,
 586                                     allocation->width - 2 * border_width -
 587                                     expander_size - 2 * expander_spacing -
 588                                     2 * focus_width - 2 * focus_pad);
 589       label_allocation.width = MAX (label_allocation.width, 1);
 590
 591       label_allocation.height = MIN (label_requisition.height,
 592                                      allocation->height - 2 * border_width -
 593                                      2 * focus_width - 2 * focus_pad -
 594                                      (child_visible ? priv->spacing : 0));
 595       label_allocation.height = MAX (label_allocation.height, 1);
 596
 597       gtk_widget_size_allocate (priv->label_widget, &label_allocation);
 598
 599       label_height = label_allocation.height;
 600     }
 601   else
 602     {
 603       label_height = 0;
 604     }
 605
 606   if (GTK_WIDGET_REALIZED (widget))
 607     {
 608       GdkRectangle rect;
 609
 610       get_expander_bounds (expander, &rect);
 611
 612       gdk_window_move_resize (priv->event_window,
 613                               allocation->x + border_width, rect.y,
 614                               MAX (allocation->width - 2 * border_width, 1), rect.width);
 615     }
 616
 617   if (child_visible)
 618     {
 619       GtkAllocation child_allocation;
 620       gint top_height;
 621
 622       top_height = MAX (2 * expander_spacing + expander_size,
 623                         label_height +
 624                         (interior_focus ? 2 * focus_width + 2 * focus_pad : 0));
 625
 626       child_allocation.x = widget->allocation.x + border_width;
 627       child_allocation.y = widget->allocation.y + border_width + top_height + priv->spacing;
 628
 629       if (!interior_focus)
 630         child_allocation.y += 2 * focus_width + 2 * focus_pad;
 631
 632       child_allocation.width = MAX (allocation->width - 2 * border_width, 1);
 633
 634       child_allocation.height = allocation->height - top_height -
 635                                 2 * border_width - priv->spacing -
 636                                 (!interior_focus ? 2 * focus_width + 2 * focus_pad : 0);
 637       child_allocation.height = MAX (child_allocation.height, 1);
 638
 639       gtk_widget_size_allocate (bin->child, &child_allocation);
 640     }
 641 }
 642
 643 static void
 644 gtk_expander_map (GtkWidget *widget)
 645 {
 646   GtkExpanderPrivate *priv = GTK_EXPANDER (widget)->priv;
 647
 648   if (priv->label_widget)
 649     gtk_widget_map (priv->label_widget);
 650
 651   GTK_WIDGET_CLASS (parent_class)->map (widget);
 652
 653   if (priv->event_window)
 654     gdk_window_show (priv->event_window);
 655 }
 656
 657 static void
 658 gtk_expander_unmap (GtkWidget *widget)
 659 {
 660   GtkExpanderPrivate *priv = GTK_EXPANDER (widget)->priv;
 661
 662   if (priv->event_window)
 663     gdk_window_hide (priv->event_window);
 664
 665   GTK_WIDGET_CLASS (parent_class)->unmap (widget);
 666
 667   if (priv->label_widget)
 668     gtk_widget_unmap (priv->label_widget);
 669 }
 670
 671 static void
 672 gtk_expander_paint (GtkExpander *expander)
 673 {
 674   GtkWidget *widget;
 675   GdkRectangle clip;
 676   GtkStateType state;
 677
 678   widget = GTK_WIDGET (expander);
 679
 680   get_expander_bounds (expander, &clip);
 681
 682   state = widget->state;
 683   if (expander->priv->prelight)
 684     state = GTK_STATE_PRELIGHT;
 685
 686   gtk_paint_expander (widget->style,
 687                       widget->window,
 688                       state,
 689                       &clip,
 690                       widget,
 691                       "expander",
 692                       clip.x + clip.width / 2,
 693                       clip.y + clip.height / 2,
 694                       expander->priv->expander_style);
 695 }
 696
 697 static void
 698 gtk_expander_paint_focus (GtkExpander  *expander,
 699                           GdkRectangle *area)
 700 {
 701   GtkWidget *widget;
 702   GtkExpanderPrivate *priv;
 703   gint x, y, width, height;
 704   gboolean interior_focus;
 705   gint border_width;
 706   gint focus_width;
 707   gint focus_pad;
 708   gint expander_size;
 709   gint expander_spacing;
 710   gboolean ltr;
 711
 712   widget = GTK_WIDGET (expander);
 713   priv = expander->priv;
 714
 715   border_width = GTK_CONTAINER (widget)->border_width;
 716
 717   gtk_widget_style_get (widget,
 718                         "interior-focus", &interior_focus,
 719                         "focus-line-width", &focus_width,
 720                         "focus-padding", &focus_pad,
 721                         "expander-size", &expander_size,
 722                         "expander-spacing", &expander_spacing,
 723                         NULL);
 724
 725   ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 726
 727   x = widget->allocation.x + border_width;
 728   y = widget->allocation.y + border_width;
 729
 730   if (ltr && interior_focus)
 731     x += expander_spacing * 2 + expander_size;
 732
 733   width = height = 0;
 734
 735   if (priv->label_widget && GTK_WIDGET_VISIBLE (priv->label_widget))
 736     {
 737       GtkAllocation label_allocation = priv->label_widget->allocation;
 738
 739       width  = label_allocation.width;
 740       height = label_allocation.height;
 741     }
 742
 743   if (!interior_focus)
 744     {
 745       width += expander_size + 2 * expander_spacing;
 746       height = MAX (height, expander_size + 2 * expander_spacing);
 747     }
 748
 749   width  += 2 * focus_pad + 2 * focus_width;
 750   height += 2 * focus_pad + 2 * focus_width;
 751
 752   gtk_paint_focus (widget->style, widget->window, GTK_WIDGET_STATE (widget),
 753                    area, widget, "expander",
 754                    x, y, width, height);
 755 }
 756
 757 static gboolean
 758 gtk_expander_expose (GtkWidget      *widget,
 759                      GdkEventExpose *event)
 760 {
 761   if (GTK_WIDGET_DRAWABLE (widget))
 762     {
 763       GtkExpander *expander = GTK_EXPANDER (widget);
 764
 765       gtk_expander_paint (expander);
 766
 767       if (GTK_WIDGET_HAS_FOCUS (expander))
 768         gtk_expander_paint_focus (expander, &event->area);
 769
 770       if (expander->priv->label_widget)
 771         gtk_container_propagate_expose (GTK_CONTAINER (widget),
 772                                         expander->priv->label_widget,
 773                                         event);
 774
 775       GTK_WIDGET_CLASS (parent_class)->expose_event (widget, event);
 776     }
 777
 778   return FALSE;
 779 }
 780
 781 static gboolean
 782 gtk_expander_button_press (GtkWidget      *widget,
 783                            GdkEventButton *event)
 784 {
 785   GtkExpander *expander = GTK_EXPANDER (widget);
 786
 787   if (event->button == 1 && event->window == expander->priv->event_window)
 788     {
 789       expander->priv->button_down = TRUE;
 790       return TRUE;
 791     }
 792
 793   return FALSE;
 794 }
 795
 796 static gboolean
 797 gtk_expander_button_release (GtkWidget      *widget,
 798                              GdkEventButton *event)
 799 {
 800   GtkExpander *expander = GTK_EXPANDER (widget);
 801
 802   if (event->button == 1 && expander->priv->button_down)
 803     {
 804       gtk_widget_activate (widget);
 805       expander->priv->button_down = FALSE;
 806       return TRUE;
 807     }
 808
 809   return FALSE;
 810 }
 811
 812 static void
 813 gtk_expander_grab_notify (GtkWidget *widget,
 814                           gboolean   was_grabbed)
 815 {
 816   if (!was_grabbed)
 817     GTK_EXPANDER (widget)->priv->button_down = FALSE;
 818 }
 819
 820 static void
 821 gtk_expander_state_changed (GtkWidget    *widget,
 822                             GtkStateType  previous_state)
 823 {
 824   if (!GTK_WIDGET_IS_SENSITIVE (widget))
 825     GTK_EXPANDER (widget)->priv->button_down = FALSE;
 826 }
 827
 828 static void
 829 gtk_expander_redraw_expander (GtkExpander *expander)
 830 {
 831   GdkRectangle bounds;
 832
 833   get_expander_bounds (expander, &bounds);
 834
 835   gtk_widget_queue_draw_area (GTK_WIDGET (expander),
 836                               bounds.x,
 837                               bounds.y,
 838                               bounds.width,
 839                               bounds.height);
 840 }
 841
 842 static gboolean
 843 gtk_expander_enter_notify (GtkWidget        *widget,
 844                            GdkEventCrossing *event)
 845 {
 846   GtkExpander *expander = GTK_EXPANDER (widget);
 847   GtkWidget *event_widget;
 848
 849   event_widget = gtk_get_event_widget ((GdkEvent *) event);
 850
 851   if (event_widget == widget &&
 852       event->detail != GDK_NOTIFY_INFERIOR)
 853     {
 854       expander->priv->prelight = TRUE;
 855       gtk_expander_redraw_expander (expander);
 856     }
 857
 858   return FALSE;
 859 }
 860
 861 static gboolean
 862 gtk_expander_leave_notify (GtkWidget        *widget,
 863                            GdkEventCrossing *event)
 864 {
 865   GtkExpander *expander = GTK_EXPANDER (widget);
 866   GtkWidget *event_widget;
 867
 868   event_widget = gtk_get_event_widget ((GdkEvent *) event);
 869
 870   if (event_widget == widget &&
 871       event->detail != GDK_NOTIFY_INFERIOR)
 872     {
 873       expander->priv->prelight = FALSE;
 874       gtk_expander_redraw_expander (expander);
 875     }
 876
 877   return FALSE;
 878 }
 879
 880 typedef enum
 881 {
 882   FOCUS_NONE,
 883   FOCUS_WIDGET,
 884   FOCUS_LABEL,
 885   FOCUS_CHILD
 886 } FocusSite;
 887
 888 static gboolean
 889 focus_current_site (GtkExpander      *expander,
 890                     GtkDirectionType  direction)
 891 {
 892   GtkWidget *current_focus;
 893
 894   current_focus = GTK_CONTAINER (expander)->focus_child;
 895
 896   if (!current_focus)
 897     return FALSE;
 898
 899   return gtk_widget_child_focus (current_focus, direction);
 900 }
 901
 902 static gboolean
 903 focus_in_site (GtkExpander      *expander,
 904                FocusSite         site,
 905                GtkDirectionType  direction)
 906 {
 907   switch (site)
 908     {
 909     case FOCUS_WIDGET:
 910       gtk_widget_grab_focus (GTK_WIDGET (expander));
 911       return TRUE;
 912     case FOCUS_LABEL:
 913       if (expander->priv->label_widget)
 914         return gtk_widget_child_focus (expander->priv->label_widget, direction);
 915       else
 916         return FALSE;
 917     case FOCUS_CHILD:
 918       {
 919         GtkWidget *child = gtk_bin_get_child (GTK_BIN (expander));
 920
 921         if (child && GTK_WIDGET_CHILD_VISIBLE (child))
 922           return gtk_widget_child_focus (child, direction);
 923         else
 924           return FALSE;
 925       }
 926     case FOCUS_NONE:
 927       break;
 928     }
 929
 930   g_assert_not_reached ();
 931   return FALSE;
 932 }
 933
 934 static FocusSite
 935 get_next_site (GtkExpander      *expander,
 936                FocusSite         site,
 937                GtkDirectionType  direction)
 938 {
 939   gboolean ltr;
 940
 941   ltr = gtk_widget_get_direction (GTK_WIDGET (expander)) != GTK_TEXT_DIR_RTL;
 942
 943   switch (site)
 944     {
 945     case FOCUS_NONE:
 946       switch (direction)
 947         {
 948         case GTK_DIR_TAB_BACKWARD:
 949         case GTK_DIR_LEFT:
 950         case GTK_DIR_UP:
 951           return FOCUS_CHILD;
 952         case GTK_DIR_TAB_FORWARD:
 953         case GTK_DIR_DOWN:
 954         case GTK_DIR_RIGHT:
 955           return FOCUS_WIDGET;
 956         }
 957     case FOCUS_WIDGET:
 958       switch (direction)
 959         {
 960         case GTK_DIR_TAB_BACKWARD:
 961         case GTK_DIR_UP:
 962           return FOCUS_NONE;
 963         case GTK_DIR_LEFT:
 964           return ltr ? FOCUS_NONE : FOCUS_LABEL;
 965         case GTK_DIR_TAB_FORWARD:
 966         case GTK_DIR_DOWN:
 967           return FOCUS_LABEL;
 968         case GTK_DIR_RIGHT:
 969           return ltr ? FOCUS_LABEL : FOCUS_NONE;
 970           break;
 971         }
 972     case FOCUS_LABEL:
 973       switch (direction)
 974         {
 975         case GTK_DIR_TAB_BACKWARD:
 976         case GTK_DIR_UP:
 977           return FOCUS_WIDGET;
 978         case GTK_DIR_LEFT:
 979           return ltr ? FOCUS_WIDGET : FOCUS_CHILD;
 980         case GTK_DIR_TAB_FORWARD:
 981         case GTK_DIR_DOWN:
 982           return FOCUS_CHILD;
 983         case GTK_DIR_RIGHT:
 984           return ltr ? FOCUS_CHILD : FOCUS_WIDGET;
 985           break;
 986         }
 987     case FOCUS_CHILD:
 988       switch (direction)
 989         {
 990         case GTK_DIR_TAB_BACKWARD:
 991         case GTK_DIR_LEFT:
 992         case GTK_DIR_UP:
 993           return FOCUS_LABEL;
 994         case GTK_DIR_TAB_FORWARD:
 995         case GTK_DIR_DOWN:
 996         case GTK_DIR_RIGHT:
 997           return FOCUS_NONE;
 998         }
 999     }
1000
1001   g_assert_not_reached ();
1002   return FOCUS_NONE;
1003 }
1004
1005 static gboolean
1006 gtk_expander_focus (GtkWidget        *widget,
1007                     GtkDirectionType  direction)
1008 {
1009   GtkExpander *expander = GTK_EXPANDER (widget);
1010
1011   if (!focus_current_site (expander, direction))
1012     {
1013       GtkWidget *old_focus_child;
1014       gboolean widget_is_focus;
1015       FocusSite site = FOCUS_NONE;
1016
1017       widget_is_focus = gtk_widget_is_focus (widget);
1018       old_focus_child = GTK_CONTAINER (widget)->focus_child;
1019
1020       if (old_focus_child && old_focus_child == expander->priv->label_widget)
1021         site = FOCUS_LABEL;
1022       else if (old_focus_child)
1023         site = FOCUS_CHILD;
1024       else if (widget_is_focus)
1025         site = FOCUS_WIDGET;
1026
1027       while ((site = get_next_site (expander, site, direction)) != FOCUS_NONE)
1028         {
1029           if (focus_in_site (expander, site, direction))
1030             return TRUE;
1031         }
1032
1033       return FALSE;
1034     }
1035
1036   return TRUE;
1037 }
1038
1039 static void
1040 gtk_expander_add (GtkContainer *container,
1041                   GtkWidget    *widget)
1042 {
1043   GTK_CONTAINER_CLASS (parent_class)->add (container, widget);
1044
1045   gtk_widget_set_child_visible (widget, GTK_EXPANDER (container)->priv->expanded);
1046   gtk_widget_queue_resize (GTK_WIDGET (container));
1047 }
1048
1049 static void
1050 gtk_expander_remove (GtkContainer *container,
1051                      GtkWidget    *widget)
1052 {
1053   GtkExpander *expander = GTK_EXPANDER (container);
1054
1055   if (GTK_EXPANDER (expander)->priv->label_widget == widget)
1056     gtk_expander_set_label_widget (expander, NULL);
1057   else
1058     GTK_CONTAINER_CLASS (parent_class)->remove (container, widget);
1059 }
1060
1061 static void
1062 gtk_expander_forall (GtkContainer *container,
1063                      gboolean      include_internals,
1064                      GtkCallback   callback,
1065                      gpointer      callback_data)
1066 {
1067   GtkBin *bin = GTK_BIN (container);
1068   GtkExpanderPrivate *priv = GTK_EXPANDER (container)->priv;
1069
1070   if (bin->child)
1071     (* callback) (bin->child, callback_data);
1072
1073   if (priv->label_widget)
1074     (* callback) (priv->label_widget, callback_data);
1075 }
1076
1077 static void
1078 gtk_expander_activate (GtkExpander *expander)
1079 {
1080   gtk_expander_set_expanded (expander, !expander->priv->expanded);
1081 }
1082
1083
1084 /**
1085  * gtk_expander_new:
1086  * @label: the text of the label
1087  *
1088  * Creates a new expander using @label as the text of the label.
1089  *
1090  * Return value: a new #GtkExpander widget.
1091  *
1092  * Since: 2.4
1093  **/
1094 GtkWidget *
1095 gtk_expander_new (const gchar *label)
1096 {
1097   return g_object_new (GTK_TYPE_EXPANDER, "label", label, NULL);
1098 }
1099
1100 /**
1101  * gtk_expander_new_with_mnemonic:
1102  * @label: the text of the label with an underscore in front of the
1103  *         mnemonic character
1104  *
1105  * Creates a new expander using @label as the text of the label.
1106  * If characters in @label are preceded by an underscore, they are underlined.
1107  * If you need a literal underscore character in a label, use '__' (two
1108  * underscores). The first underlined character represents a keyboard
1109  * accelerator called a mnemonic.
1110  * Pressing Alt and that key activates the button.
1111  *
1112  * Return value: a new #GtkExpander widget.
1113  *
1114  * Since: 2.4
1115  **/
1116 GtkWidget *
1117 gtk_expander_new_with_mnemonic (const gchar *label)
1118 {
1119   return g_object_new (GTK_TYPE_EXPANDER,
1120                        "label", label,
1121                        "use_underline", TRUE,
1122                        NULL);
1123 }
1124
1125 static gboolean
1126 gtk_expander_animation_timeout (GtkExpander *expander)
1127 {
1128   GtkExpanderPrivate *priv = expander->priv;
1129   GdkRectangle area;
1130   gboolean finish = FALSE;
1131
1132   if (GTK_WIDGET_REALIZED (expander))
1133     {
1134       get_expander_bounds (expander, &area);
1135       gdk_window_invalidate_rect (GTK_WIDGET (expander)->window, &area, TRUE);
1136     }
1137
1138   if (priv->expanded)
1139     {
1140       if (priv->expander_style == GTK_EXPANDER_COLLAPSED)
1141         {
1142           priv->expander_style = GTK_EXPANDER_SEMI_EXPANDED;
1143         }
1144       else
1145         {
1146           priv->expander_style = GTK_EXPANDER_EXPANDED;
1147           finish = TRUE;
1148         }
1149     }
1150   else
1151     {
1152       if (priv->expander_style == GTK_EXPANDER_EXPANDED)
1153         {
1154           priv->expander_style = GTK_EXPANDER_SEMI_COLLAPSED;
1155         }
1156       else
1157         {
1158           priv->expander_style = GTK_EXPANDER_COLLAPSED;
1159           finish = TRUE;
1160         }
1161     }
1162
1163   if (finish)
1164     {
1165       priv->animation_timeout = 0;
1166       if (GTK_BIN (expander)->child)
1167         gtk_widget_set_child_visible (GTK_BIN (expander)->child, priv->expanded);
1168       gtk_widget_queue_resize (GTK_WIDGET (expander));
1169     }
1170
1171   return !finish;
1172 }
1173
1174 static void
1175 gtk_expander_start_animation (GtkExpander *expander)
1176 {
1177   GtkExpanderPrivate *priv = expander->priv;
1178
1179   if (!GTK_WIDGET_REALIZED (expander))
1180     return;
1181
1182   if (priv->animation_timeout)
1183     g_source_remove (priv->animation_timeout);
1184
1185   priv->animation_timeout =
1186                 g_timeout_add (50,
1187                                (GSourceFunc) gtk_expander_animation_timeout,
1188                                expander);
1189 }
1190
1191 /**
1192  * gtk_expander_set_expanded:
1193  * @expander: a #GtkExpander
1194  * @expanded: whether the child widget is revealed
1195  *
1196  * Sets the state of the expander. Set to %TRUE, if you want
1197  * the child widget to be revealed, and %FALSE if you want the
1198  * child widget to be hidden.
1199  *
1200  * Since: 2.4
1201  **/
1202 void
1203 gtk_expander_set_expanded (GtkExpander *expander,
1204                            gboolean     expanded)
1205 {
1206   GtkExpanderPrivate *priv;
1207
1208   g_return_if_fail (GTK_IS_EXPANDER (expander));
1209
1210   priv = expander->priv;
1211
1212   expanded = expanded != FALSE;
1213
1214   if (priv->expanded != expanded)
1215     {
1216       priv->expanded = expanded;
1217
1218       if (GTK_WIDGET_VISIBLE (expander))
1219         gtk_expander_start_animation (expander);
1220
1221       else if (GTK_BIN (expander)->child)
1222         {
1223           priv->expander_style = expanded ? GTK_EXPANDER_EXPANDED :
1224                                             GTK_EXPANDER_COLLAPSED;
1225           gtk_widget_set_child_visible (GTK_BIN (expander)->child, priv->expanded);
1226           gtk_widget_queue_resize (GTK_WIDGET (expander));
1227         }
1228
1229       g_object_notify (G_OBJECT (expander), "expanded");
1230     }
1231 }
1232
1233 /**
1234  * gtk_expander_get_expanded:
1235  * @expander:a #GtkExpander
1236  *
1237  * Queries a #GtkExpander and returns its current state. Returns %TRUE
1238  * if the child widget is revealed.
1239  *
1240  * See gtk_expander_set_expanded().
1241  *
1242  * Return value: the current state of the expander.
1243  *
1244  * Since: 2.4
1245  **/
1246 gboolean
1247 gtk_expander_get_expanded (GtkExpander *expander)
1248 {
1249   g_return_val_if_fail (GTK_IS_EXPANDER (expander), FALSE);
1250
1251   return expander->priv->expanded;
1252 }
1253
1254 /**
1255  * gtk_expander_set_spacing:
1256  * @expander: a #GtkExpander
1257  * @spacing: distance between the expander and child in pixels.
1258  *
1259  * Sets the spacing field of @expander, which is the number of pixels to
1260  * place between expander and the child.
1261  *
1262  * Since: 2.4
1263  **/
1264 void
1265 gtk_expander_set_spacing (GtkExpander *expander,
1266                           gint         spacing)
1267 {
1268   g_return_if_fail (GTK_IS_EXPANDER (expander));
1269   g_return_if_fail (spacing >= 0);
1270
1271   if (expander->priv->spacing != spacing)
1272     {
1273       expander->priv->spacing = spacing;
1274
1275       gtk_widget_queue_resize (GTK_WIDGET (expander));
1276
1277       g_object_notify (G_OBJECT (expander), "spacing");
1278     }
1279 }
1280
1281 /**
1282  * gtk_expander_get_spacing:
1283  * @expander: a #GtkExpander
1284  *
1285  * Gets the value set by gtk_expander_set_spacing().
1286  *
1287  * Return value: spacing between the expander and child.
1288  *
1289  * Since: 2.4
1290  **/
1291 gint
1292 gtk_expander_get_spacing (GtkExpander *expander)
1293 {
1294   g_return_val_if_fail (GTK_IS_EXPANDER (expander), 0);
1295
1296   return expander->priv->spacing;
1297 }
1298
1299 /**
1300  * gtk_expander_set_label:
1301  * @expander: a #GtkExpander
1302  * @label: a string
1303  *
1304  * Sets the text of the label of the expander to @label.
1305  *
1306  * This will also clear any previously set labels.
1307  *
1308  * Since: 2.4
1309  **/
1310 void
1311 gtk_expander_set_label (GtkExpander *expander,
1312                         const gchar *label)
1313 {
1314   g_return_if_fail (GTK_IS_EXPANDER (expander));
1315
1316   if (!label)
1317     {
1318       gtk_expander_set_label_widget (expander, NULL);
1319     }
1320   else
1321     {
1322       GtkWidget *child;
1323
1324       child = gtk_label_new (label);
1325       gtk_label_set_use_underline (GTK_LABEL (child), expander->priv->use_underline);
1326       gtk_widget_show (child);
1327
1328       gtk_expander_set_label_widget (expander, child);
1329     }
1330
1331   g_object_notify (G_OBJECT (expander), "label");
1332 }
1333
1334 /**
1335  * gtk_expander_get_label:
1336  * @expander: a #GtkExpander
1337  *
1338  * Fetches the text from the label of the expander, as set by
1339  * gtk_expander_set_label(). If the label text has not
1340  * been set the return value will be %NULL. This will be the
1341  * case if you create an empty button with gtk_button_new() to
1342  * use as a container.
1343  *
1344  * Return value: The text of the label widget. This string is owned
1345  * by the widget and must not be modified or freed.
1346  *
1347  * Since: 2.4
1348  **/
1349 G_CONST_RETURN char *
1350 gtk_expander_get_label (GtkExpander *expander)
1351 {
1352   GtkExpanderPrivate *priv;
1353
1354   g_return_val_if_fail (GTK_IS_EXPANDER (expander), NULL);
1355
1356   priv = expander->priv;
1357
1358   if (priv->label_widget && GTK_IS_LABEL (priv->label_widget))
1359     return gtk_label_get_text (GTK_LABEL (priv->label_widget));
1360   else
1361     return NULL;
1362 }
1363
1364 /**
1365  * gtk_expander_set_use_underline:
1366  * @expander: a #GtkExpander
1367  * @use_underline: %TRUE if underlines in the text indicate mnemonics
1368  *
1369  * If true, an underline in the text of the expander label indicates
1370  * the next character should be used for the mnemonic accelerator key.
1371  *
1372  * Since: 2.4
1373  **/
1374 void
1375 gtk_expander_set_use_underline (GtkExpander *expander,
1376                                 gboolean     use_underline)
1377 {
1378   GtkExpanderPrivate *priv;
1379
1380   g_return_if_fail (GTK_IS_EXPANDER (expander));
1381
1382   priv = expander->priv;
1383
1384   use_underline = use_underline != FALSE;
1385
1386   if (priv->use_underline != use_underline)
1387     {
1388       priv->use_underline = use_underline;
1389
1390       if (priv->label_widget && GTK_IS_LABEL (priv->label_widget))
1391         gtk_label_set_use_underline (GTK_LABEL (priv->label_widget), use_underline);
1392
1393       g_object_notify (G_OBJECT (expander), "use_underline");
1394     }
1395 }
1396
1397 /**
1398  * gtk_expander_get_use_underline:
1399  * @expander: a #GtkExpander
1400  *
1401  * Returns whether an embedded underline in the expander label indicates a
1402  * mnemonic. See gtk_expander_set_use_underline().
1403  *
1404  * Return value: %TRUE if an embedded underline in the expander label
1405  *               indicates the mnemonic accelerator keys.
1406  *
1407  * Since: 2.4
1408  **/
1409 gboolean
1410 gtk_expander_get_use_underline (GtkExpander *expander)
1411 {
1412   g_return_val_if_fail (GTK_IS_EXPANDER (expander), FALSE);
1413
1414   return expander->priv->use_underline;
1415 }
1416
1417 /**
1418  * gtk_expander_set_label_widget:
1419  * @expander: a #GtkExpander
1420  * @label_widget: the new label widget
1421  *
1422  * Set the label widget for the expander. This is the widget
1423  * that will appear embedded alongside the expander arrow.
1424  *
1425  * Since: 2.4
1426  **/
1427 void
1428 gtk_expander_set_label_widget (GtkExpander *expander,
1429                                GtkWidget   *label_widget)
1430 {
1431   GtkExpanderPrivate *priv;
1432
1433   g_return_if_fail (GTK_IS_EXPANDER (expander));
1434   g_return_if_fail (label_widget == NULL || GTK_IS_WIDGET (label_widget));
1435   g_return_if_fail (label_widget == NULL || label_widget->parent == NULL);
1436
1437   priv = expander->priv;
1438
1439   if (priv->label_widget == label_widget)
1440     return;
1441
1442   if (priv->label_widget)
1443     gtk_widget_unparent (priv->label_widget);
1444
1445   priv->label_widget = label_widget;
1446
1447   if (label_widget)
1448     {
1449       priv->label_widget = label_widget;
1450       gtk_widget_set_parent (label_widget, GTK_WIDGET (expander));
1451     }
1452
1453   if (GTK_WIDGET_VISIBLE (expander))
1454     gtk_widget_queue_resize (GTK_WIDGET (expander));
1455
1456   g_object_freeze_notify (G_OBJECT (expander));
1457   g_object_notify (G_OBJECT (expander), "label_widget");
1458   g_object_notify (G_OBJECT (expander), "label");
1459   g_object_thaw_notify (G_OBJECT (expander));
1460 }
1461
1462 /**
1463  * gtk_expander_get_label_widget:
1464  * @expander: a #GtkExpander
1465  *
1466  * Retrieves the label widget for the frame. See
1467  * gtk_expander_set_label_widget().
1468  *
1469  * Return value: the label widget, or %NULL if there is none.
1470  *
1471  * Since: 2.4
1472  **/
1473 GtkWidget *
1474 gtk_expander_get_label_widget (GtkExpander *expander)
1475 {
1476   g_return_val_if_fail (GTK_IS_EXPANDER (expander), NULL);
1477
1478   return expander->priv->label_widget;
1479 }