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_USE_MARKUP,
  48   PROP_PADDING,
  49   PROP_LABEL_WIDGET
  50 };
  51
  52 struct _GtkExpanderPrivate
  53 {
  54   GtkWidget        *label_widget;
  55   GdkWindow        *event_window;
  56   gint              spacing;
  57
  58   GtkExpanderStyle  expander_style;
  59   guint             animation_timeout;
  60
  61   guint             expanded : 1;
  62   guint             use_underline : 1;
  63   guint             use_markup : 1;
  64   guint             button_down : 1;
  65   guint             prelight : 1;
  66 };
  67
  68 static void gtk_expander_class_init (GtkExpanderClass *klass);
  69 static void gtk_expander_init       (GtkExpander      *expander);
  70
  71 static void gtk_expander_set_property (GObject          *object,
  72                                        guint             prop_id,
  73                                        const GValue     *value,
  74                                        GParamSpec       *pspec);
  75 static void gtk_expander_get_property (GObject          *object,
  76                                        guint             prop_id,
  77                                        GValue           *value,
  78                                        GParamSpec       *pspec);
  79
  80 static void gtk_expander_destroy (GtkObject *object);
  81
  82 static void     gtk_expander_realize        (GtkWidget        *widget);
  83 static void     gtk_expander_unrealize      (GtkWidget        *widget);
  84 static void     gtk_expander_size_request   (GtkWidget        *widget,
  85                                              GtkRequisition   *requisition);
  86 static void     gtk_expander_size_allocate  (GtkWidget        *widget,
  87                                              GtkAllocation    *allocation);
  88 static void     gtk_expander_map            (GtkWidget        *widget);
  89 static void     gtk_expander_unmap          (GtkWidget        *widget);
  90 static gboolean gtk_expander_expose         (GtkWidget        *widget,
  91                                              GdkEventExpose   *event);
  92 static gboolean gtk_expander_button_press   (GtkWidget        *widget,
  93                                              GdkEventButton   *event);
  94 static gboolean gtk_expander_button_release (GtkWidget        *widget,
  95                                              GdkEventButton   *event);
  96 static gboolean gtk_expander_enter_notify   (GtkWidget        *widget,
  97                                              GdkEventCrossing *event);
  98 static gboolean gtk_expander_leave_notify   (GtkWidget        *widget,
  99                                              GdkEventCrossing *event);
 100 static gboolean gtk_expander_focus          (GtkWidget        *widget,
 101                                              GtkDirectionType  direction);
 102 static void     gtk_expander_grab_notify    (GtkWidget        *widget,
 103                                              gboolean          was_grabbed);
 104 static void     gtk_expander_state_changed  (GtkWidget        *widget,
 105                                              GtkStateType      previous_state);
 106
 107 static void gtk_expander_add    (GtkContainer *container,
 108                                  GtkWidget    *widget);
 109 static void gtk_expander_remove (GtkContainer *container,
 110                                  GtkWidget    *widget);
 111 static void gtk_expander_forall (GtkContainer *container,
 112                                  gboolean        include_internals,
 113                                  GtkCallback     callback,
 114                                  gpointer        callback_data);
 115
 116 static void gtk_expander_activate (GtkExpander *expander);
 117
 118 static GtkBinClass *parent_class = NULL;
 119
 120 GType
 121 gtk_expander_get_type (void)
 122 {
 123   static GType expander_type = 0;
 124
 125   if (!expander_type)
 126     {
 127       static const GTypeInfo expander_info =
 128       {
 129         sizeof (GtkExpanderClass),
 130         NULL,           /* base_init */
 131         NULL,           /* base_finalize */
 132         (GClassInitFunc) gtk_expander_class_init,
 133         NULL,           /* class_finalize */
 134         NULL,           /* class_data */
 135         sizeof (GtkExpander),
 136         0,              /* n_preallocs */
 137         (GInstanceInitFunc) gtk_expander_init,
 138       };
 139
 140       expander_type = g_type_register_static (GTK_TYPE_BIN,
 141                                               "GtkExpander",
 142                                               &expander_info, 0);
 143     }
 144
 145   return expander_type;
 146 }
 147
 148 static void
 149 gtk_expander_class_init (GtkExpanderClass *klass)
 150 {
 151   GObjectClass *gobject_class;
 152   GtkObjectClass *object_class;
 153   GtkWidgetClass *widget_class;
 154   GtkContainerClass *container_class;
 155
 156   parent_class = g_type_class_peek_parent (klass);
 157
 158   gobject_class   = (GObjectClass *) klass;
 159   object_class    = (GtkObjectClass *) klass;
 160   widget_class    = (GtkWidgetClass *) klass;
 161   container_class = (GtkContainerClass *) klass;
 162
 163   gobject_class->set_property = gtk_expander_set_property;
 164   gobject_class->get_property = gtk_expander_get_property;
 165
 166   object_class->destroy = gtk_expander_destroy;
 167
 168   widget_class->realize              = gtk_expander_realize;
 169   widget_class->unrealize            = gtk_expander_unrealize;
 170   widget_class->size_request         = gtk_expander_size_request;
 171   widget_class->size_allocate        = gtk_expander_size_allocate;
 172   widget_class->map                  = gtk_expander_map;
 173   widget_class->unmap                = gtk_expander_unmap;
 174   widget_class->expose_event         = gtk_expander_expose;
 175   widget_class->button_press_event   = gtk_expander_button_press;
 176   widget_class->button_release_event = gtk_expander_button_release;
 177   widget_class->enter_notify_event   = gtk_expander_enter_notify;
 178   widget_class->leave_notify_event   = gtk_expander_leave_notify;
 179   widget_class->focus                = gtk_expander_focus;
 180   widget_class->grab_notify          = gtk_expander_grab_notify;
 181   widget_class->state_changed        = gtk_expander_state_changed;
 182
 183   container_class->add    = gtk_expander_add;
 184   container_class->remove = gtk_expander_remove;
 185   container_class->forall = gtk_expander_forall;
 186
 187   klass->activate = gtk_expander_activate;
 188
 189   g_type_class_add_private (klass, sizeof (GtkExpanderPrivate));
 190
 191   g_object_class_install_property (gobject_class,
 192                                    PROP_EXPANDED,
 193                                    g_param_spec_boolean ("expanded",
 194                                                          _("Expanded"),
 195                                                          _("Whether the expander has been opened to reveal the child widget"),
 196                                                          FALSE,
 197                                                          G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 198
 199   g_object_class_install_property (gobject_class,
 200                                    PROP_LABEL,
 201                                    g_param_spec_string ("label",
 202                                                         _("Label"),
 203                                                         _("Text of the expander's label"),
 204                                                         NULL,
 205                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 206
 207   g_object_class_install_property (gobject_class,
 208                                    PROP_USE_UNDERLINE,
 209                                    g_param_spec_boolean ("use_underline",
 210                                                          _("Use underline"),
 211                                                          _("If set, an underline in the text indicates the next character should be used for the mnemonic accelerator key"),
 212                                                          FALSE,
 213                                                          G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 214
 215   g_object_class_install_property (gobject_class,
 216                                    PROP_USE_MARKUP,
 217                                    g_param_spec_boolean ("use_markup",
 218                                                          _("Use markup"),
 219                                                          _("The text of the label includes XML markup. See pango_parse_markup()"),
 220                                                          FALSE,
 221                                                          G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 222
 223   g_object_class_install_property (gobject_class,
 224                                    PROP_PADDING,
 225                                    g_param_spec_int ("spacing",
 226                                                      _("Spacing"),
 227                                                      _("Space to put between the label and the child"),
 228                                                      0,
 229                                                      G_MAXINT,
 230                                                      0,
 231                                                      G_PARAM_READWRITE));
 232
 233   g_object_class_install_property (gobject_class,
 234                                    PROP_LABEL_WIDGET,
 235                                    g_param_spec_object ("label_widget",
 236                                                         _("Label widget"),
 237                                                         _("A widget to display in place of the usual expander label"),
 238                                                         GTK_TYPE_WIDGET,
 239                                                         G_PARAM_READWRITE));
 240
 241   gtk_widget_class_install_style_property (widget_class,
 242                                            g_param_spec_int ("expander-size",
 243                                                              _("Expander Size"),
 244                                                              _("Size of the expander arrow"),
 245                                                              0,
 246                                                              G_MAXINT,
 247                                                              DEFAULT_EXPANDER_SIZE,
 248                                                              G_PARAM_READABLE));
 249
 250   gtk_widget_class_install_style_property (widget_class,
 251                                            g_param_spec_int ("expander-spacing",
 252                                                              _("Indicator Spacing"),
 253                                                              _("Spacing around expander arrow"),
 254                                                              0,
 255                                                              G_MAXINT,
 256                                                              DEFAULT_EXPANDER_SPACING,
 257                                                              G_PARAM_READABLE));
 258
 259   widget_class->activate_signal =
 260     g_signal_new ("activate",
 261                   G_TYPE_FROM_CLASS (gobject_class),
 262                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 263                   G_STRUCT_OFFSET (GtkExpanderClass, activate),
 264                   NULL, NULL,
 265                   _gtk_marshal_VOID__VOID,
 266                   G_TYPE_NONE, 0);
 267 }
 268
 269 static void
 270 gtk_expander_init (GtkExpander *expander)
 271 {
 272   GtkExpanderPrivate *priv;
 273
 274   expander->priv = priv = GTK_EXPANDER_GET_PRIVATE (expander);
 275
 276   GTK_WIDGET_SET_FLAGS (expander, GTK_CAN_FOCUS);
 277   GTK_WIDGET_SET_FLAGS (expander, GTK_NO_WINDOW);
 278
 279   priv->label_widget = NULL;
 280   priv->event_window = NULL;
 281   priv->spacing = 0;
 282
 283   priv->expander_style = GTK_EXPANDER_COLLAPSED;
 284   priv->animation_timeout = 0;
 285
 286   priv->expanded = FALSE;
 287   priv->use_underline = FALSE;
 288   priv->use_markup = FALSE;
 289   priv->button_down = FALSE;
 290   priv->prelight = FALSE;
 291 }
 292
 293 static void
 294 gtk_expander_set_property (GObject      *object,
 295                            guint         prop_id,
 296                            const GValue *value,
 297                            GParamSpec   *pspec)
 298 {
 299   GtkExpander *expander = GTK_EXPANDER (object);
 300
 301   switch (prop_id)
 302     {
 303     case PROP_EXPANDED:
 304       gtk_expander_set_expanded (expander, g_value_get_boolean (value));
 305       break;
 306     case PROP_LABEL:
 307       gtk_expander_set_label (expander, g_value_get_string (value));
 308       break;
 309     case PROP_USE_UNDERLINE:
 310       gtk_expander_set_use_underline (expander, g_value_get_boolean (value));
 311       break;
 312     case PROP_USE_MARKUP:
 313       gtk_expander_set_use_markup (expander, g_value_get_boolean (value));
 314       break;
 315     case PROP_PADDING:
 316       gtk_expander_set_spacing (expander, g_value_get_int (value));
 317       break;
 318     case PROP_LABEL_WIDGET:
 319       gtk_expander_set_label_widget (expander, g_value_get_object (value));
 320       break;
 321     default:
 322       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 323       break;
 324     }
 325 }
 326
 327 static void
 328 gtk_expander_get_property (GObject    *object,
 329                            guint       prop_id,
 330                            GValue     *value,
 331                            GParamSpec *pspec)
 332 {
 333   GtkExpander *expander = GTK_EXPANDER (object);
 334   GtkExpanderPrivate *priv = expander->priv;
 335
 336   switch (prop_id)
 337     {
 338     case PROP_EXPANDED:
 339       g_value_set_boolean (value, priv->expanded);
 340       break;
 341     case PROP_LABEL:
 342       g_value_set_string (value, gtk_expander_get_label (expander));
 343       break;
 344     case PROP_USE_UNDERLINE:
 345       g_value_set_boolean (value, priv->use_underline);
 346       break;
 347     case PROP_USE_MARKUP:
 348       g_value_set_boolean (value, priv->use_markup);
 349       break;
 350     case PROP_PADDING:
 351       g_value_set_int (value, priv->spacing);
 352       break;
 353     case PROP_LABEL_WIDGET:
 354       g_value_set_object (value,
 355                           priv->label_widget ?
 356                           G_OBJECT (priv->label_widget) : NULL);
 357       break;
 358     default:
 359       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 360       break;
 361     }
 362 }
 363
 364 static void
 365 gtk_expander_destroy (GtkObject *object)
 366 {
 367   GtkExpanderPrivate *priv = GTK_EXPANDER (object)->priv;
 368
 369   if (priv->animation_timeout)
 370     {
 371       g_source_remove (priv->animation_timeout);
 372       priv->animation_timeout = 0;
 373     }
 374
 375   GTK_OBJECT_CLASS (parent_class)->destroy (object);
 376 }
 377
 378 static void
 379 gtk_expander_realize (GtkWidget *widget)
 380 {
 381   GtkExpanderPrivate *priv;
 382   GdkWindowAttr attributes;
 383   gint attributes_mask;
 384   gint border_width;
 385
 386   priv = GTK_EXPANDER (widget)->priv;
 387   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 388
 389   border_width = GTK_CONTAINER (widget)->border_width;
 390
 391   attributes.window_type = GDK_WINDOW_CHILD;
 392   attributes.x = widget->allocation.x + border_width;
 393   attributes.y = widget->allocation.y + border_width;
 394   attributes.width = widget->allocation.width - 2 * border_width;
 395   attributes.height = widget->allocation.height - 2 * border_width;
 396   attributes.wclass = GDK_INPUT_ONLY;
 397   attributes.event_mask = gtk_widget_get_events (widget)     |
 398                                 GDK_BUTTON_PRESS_MASK        |
 399                                 GDK_BUTTON_RELEASE_MASK      |
 400                                 GDK_ENTER_NOTIFY_MASK        |
 401                                 GDK_LEAVE_NOTIFY_MASK;
 402
 403   attributes_mask = GDK_WA_X | GDK_WA_Y;
 404
 405   widget->window = gtk_widget_get_parent_window (widget);
 406   g_object_ref (widget->window);
 407
 408   priv->event_window = gdk_window_new (gtk_widget_get_parent_window (widget),
 409                                        &attributes, attributes_mask);
 410   gdk_window_set_user_data (priv->event_window, widget);
 411
 412   widget->style = gtk_style_attach (widget->style, widget->window);
 413   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 414 }
 415
 416 static void
 417 gtk_expander_unrealize (GtkWidget *widget)
 418 {
 419   GtkExpanderPrivate *priv = GTK_EXPANDER (widget)->priv;
 420
 421   if (priv->event_window)
 422     {
 423       gdk_window_set_user_data (priv->event_window, NULL);
 424       gdk_window_destroy (priv->event_window);
 425       priv->event_window = NULL;
 426     }
 427
 428   GTK_WIDGET_CLASS (parent_class)->unrealize (widget);
 429 }
 430
 431 static void
 432 gtk_expander_size_request (GtkWidget      *widget,
 433                            GtkRequisition *requisition)
 434 {
 435   GtkExpander *expander;
 436   GtkBin *bin;
 437   GtkExpanderPrivate *priv;
 438   gint border_width;
 439   gint expander_size;
 440   gint expander_spacing;
 441   gboolean interior_focus;
 442   gint focus_width;
 443   gint focus_pad;
 444
 445   bin = GTK_BIN (widget);
 446   expander = GTK_EXPANDER (widget);
 447   priv = expander->priv;
 448
 449   border_width = GTK_CONTAINER (widget)->border_width;
 450
 451   gtk_widget_style_get (widget,
 452                         "interior-focus", &interior_focus,
 453                         "focus-line-width", &focus_width,
 454                         "focus-padding", &focus_pad,
 455                         "expander-size", &expander_size,
 456                         "expander-spacing", &expander_spacing,
 457                         NULL);
 458
 459   requisition->width = expander_size + 2 * expander_spacing +
 460                        2 * focus_width + 2 * focus_pad;
 461   requisition->height = interior_focus ? (2 * focus_width + 2 * focus_pad) : 0;
 462
 463   if (priv->label_widget && GTK_WIDGET_VISIBLE (priv->label_widget))
 464     {
 465       GtkRequisition label_requisition;
 466
 467       gtk_widget_size_request (priv->label_widget, &label_requisition);
 468
 469       requisition->width  += label_requisition.width;
 470       requisition->height += label_requisition.height;
 471     }
 472
 473   requisition->height = MAX (expander_size + 2 * expander_spacing, requisition->height);
 474
 475   if (!interior_focus)
 476     requisition->height += 2 * focus_width + 2 * focus_pad;
 477
 478   if (bin->child && GTK_WIDGET_CHILD_VISIBLE (bin->child))
 479     {
 480       GtkRequisition child_requisition;
 481
 482       gtk_widget_size_request (bin->child, &child_requisition);
 483
 484       requisition->width = MAX (requisition->width, child_requisition.width);
 485       requisition->height += child_requisition.height + priv->spacing;
 486     }
 487
 488   requisition->width  += 2 * border_width;
 489   requisition->height += 2 * border_width;
 490 }
 491
 492 static void
 493 get_expander_bounds (GtkExpander  *expander,
 494                      GdkRectangle *rect)
 495 {
 496   GtkWidget *widget;
 497   GtkBin *bin;
 498   GtkExpanderPrivate *priv;
 499   gint border_width;
 500   gint expander_size;
 501   gint expander_spacing;
 502   gboolean interior_focus;
 503   gint focus_width;
 504   gint focus_pad;
 505   gboolean ltr;
 506
 507   widget = GTK_WIDGET (expander);
 508   bin = GTK_BIN (expander);
 509   priv = expander->priv;
 510
 511   border_width = GTK_CONTAINER (expander)->border_width;
 512
 513   gtk_widget_style_get (widget,
 514                         "interior-focus", &interior_focus,
 515                         "focus-line-width", &focus_width,
 516                         "focus-padding", &focus_pad,
 517                         "expander-size", &expander_size,
 518                         "expander-spacing", &expander_spacing,
 519                         NULL);
 520
 521   ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 522
 523   rect->x = widget->allocation.x + border_width;
 524   rect->y = widget->allocation.y + border_width;
 525
 526   if (ltr)
 527     rect->x += expander_spacing;
 528   else
 529     rect->x += widget->allocation.width - 2 * border_width -
 530                expander_spacing - expander_size;
 531
 532   if (priv->label_widget && GTK_WIDGET_VISIBLE (priv->label_widget))
 533     {
 534       GtkAllocation label_allocation;
 535
 536       label_allocation = priv->label_widget->allocation;
 537
 538       if (expander_size < label_allocation.height)
 539         rect->y += focus_width + focus_pad + (label_allocation.height - expander_size) / 2;
 540       else
 541         rect->y += expander_spacing;
 542     }
 543   else
 544     {
 545       rect->y += expander_spacing;
 546     }
 547
 548   if (!interior_focus)
 549     {
 550       if (ltr)
 551         rect->x += focus_width + focus_pad;
 552       else
 553         rect->x -= focus_width + focus_pad;
 554       rect->y += focus_width + focus_pad;
 555     }
 556
 557   rect->width = rect->height = expander_size;
 558 }
 559
 560 static void
 561 gtk_expander_size_allocate (GtkWidget     *widget,
 562                             GtkAllocation *allocation)
 563 {
 564   GtkExpander *expander;
 565   GtkBin *bin;
 566   GtkExpanderPrivate *priv;
 567   GtkRequisition child_requisition;
 568   gboolean child_visible = FALSE;
 569   gint border_width;
 570   gint expander_size;
 571   gint expander_spacing;
 572   gboolean interior_focus;
 573   gint focus_width;
 574   gint focus_pad;
 575   gint label_height;
 576
 577   expander = GTK_EXPANDER (widget);
 578   bin = GTK_BIN (widget);
 579   priv = expander->priv;
 580
 581   border_width = GTK_CONTAINER (widget)->border_width;
 582
 583   gtk_widget_style_get (widget,
 584                         "interior-focus", &interior_focus,
 585                         "focus-line-width", &focus_width,
 586                         "focus-padding", &focus_pad,
 587                         "expander-size", &expander_size,
 588                         "expander-spacing", &expander_spacing,
 589                         NULL);
 590
 591   child_requisition.width = 0;
 592   child_requisition.height = 0;
 593   if (bin->child && GTK_WIDGET_CHILD_VISIBLE (bin->child))
 594     {
 595       child_visible = TRUE;
 596       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 597     }
 598
 599   widget->allocation = *allocation;
 600
 601   if (priv->label_widget && GTK_WIDGET_VISIBLE (priv->label_widget))
 602     {
 603       GtkAllocation label_allocation;
 604       GtkRequisition label_requisition;
 605       gboolean ltr;
 606
 607       gtk_widget_get_child_requisition (priv->label_widget, &label_requisition);
 608
 609       ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 610
 611       label_allocation.x = widget->allocation.x + border_width + focus_width + focus_pad;
 612       if (ltr)
 613         label_allocation.x += expander_size + 2 * expander_spacing;
 614       label_allocation.y = widget->allocation.y + border_width + focus_width + focus_pad;
 615
 616       label_allocation.width = MIN (label_requisition.width,
 617                                     allocation->width - 2 * border_width -
 618                                     expander_size - 2 * expander_spacing -
 619                                     2 * focus_width - 2 * focus_pad);
 620       label_allocation.width = MAX (label_allocation.width, 1);
 621
 622       label_allocation.height = MIN (label_requisition.height,
 623                                      allocation->height - 2 * border_width -
 624                                      2 * focus_width - 2 * focus_pad -
 625                                      (child_visible ? priv->spacing : 0));
 626       label_allocation.height = MAX (label_allocation.height, 1);
 627
 628       gtk_widget_size_allocate (priv->label_widget, &label_allocation);
 629
 630       label_height = label_allocation.height;
 631     }
 632   else
 633     {
 634       label_height = 0;
 635     }
 636
 637   if (GTK_WIDGET_REALIZED (widget))
 638     {
 639       GdkRectangle rect;
 640
 641       get_expander_bounds (expander, &rect);
 642
 643       gdk_window_move_resize (priv->event_window,
 644                               allocation->x + border_width, rect.y,
 645                               MAX (allocation->width - 2 * border_width, 1), rect.width);
 646     }
 647
 648   if (child_visible)
 649     {
 650       GtkAllocation child_allocation;
 651       gint top_height;
 652
 653       top_height = MAX (2 * expander_spacing + expander_size,
 654                         label_height +
 655                         (interior_focus ? 2 * focus_width + 2 * focus_pad : 0));
 656
 657       child_allocation.x = widget->allocation.x + border_width;
 658       child_allocation.y = widget->allocation.y + border_width + top_height + priv->spacing;
 659
 660       if (!interior_focus)
 661         child_allocation.y += 2 * focus_width + 2 * focus_pad;
 662
 663       child_allocation.width = MAX (allocation->width - 2 * border_width, 1);
 664
 665       child_allocation.height = allocation->height - top_height -
 666                                 2 * border_width - priv->spacing -
 667                                 (!interior_focus ? 2 * focus_width + 2 * focus_pad : 0);
 668       child_allocation.height = MAX (child_allocation.height, 1);
 669
 670       gtk_widget_size_allocate (bin->child, &child_allocation);
 671     }
 672 }
 673
 674 static void
 675 gtk_expander_map (GtkWidget *widget)
 676 {
 677   GtkExpanderPrivate *priv = GTK_EXPANDER (widget)->priv;
 678
 679   if (priv->label_widget)
 680     gtk_widget_map (priv->label_widget);
 681
 682   GTK_WIDGET_CLASS (parent_class)->map (widget);
 683
 684   if (priv->event_window)
 685     gdk_window_show (priv->event_window);
 686 }
 687
 688 static void
 689 gtk_expander_unmap (GtkWidget *widget)
 690 {
 691   GtkExpanderPrivate *priv = GTK_EXPANDER (widget)->priv;
 692
 693   if (priv->event_window)
 694     gdk_window_hide (priv->event_window);
 695
 696   GTK_WIDGET_CLASS (parent_class)->unmap (widget);
 697
 698   if (priv->label_widget)
 699     gtk_widget_unmap (priv->label_widget);
 700 }
 701
 702 static void
 703 gtk_expander_paint (GtkExpander *expander)
 704 {
 705   GtkWidget *widget;
 706   GdkRectangle clip;
 707   GtkStateType state;
 708
 709   widget = GTK_WIDGET (expander);
 710
 711   get_expander_bounds (expander, &clip);
 712
 713   state = widget->state;
 714   if (expander->priv->prelight)
 715     state = GTK_STATE_PRELIGHT;
 716
 717   gtk_paint_expander (widget->style,
 718                       widget->window,
 719                       state,
 720                       &clip,
 721                       widget,
 722                       "expander",
 723                       clip.x + clip.width / 2,
 724                       clip.y + clip.height / 2,
 725                       expander->priv->expander_style);
 726 }
 727
 728 static void
 729 gtk_expander_paint_focus (GtkExpander  *expander,
 730                           GdkRectangle *area)
 731 {
 732   GtkWidget *widget;
 733   GtkExpanderPrivate *priv;
 734   gint x, y, width, height;
 735   gboolean interior_focus;
 736   gint border_width;
 737   gint focus_width;
 738   gint focus_pad;
 739   gint expander_size;
 740   gint expander_spacing;
 741   gboolean ltr;
 742
 743   widget = GTK_WIDGET (expander);
 744   priv = expander->priv;
 745
 746   border_width = GTK_CONTAINER (widget)->border_width;
 747
 748   gtk_widget_style_get (widget,
 749                         "interior-focus", &interior_focus,
 750                         "focus-line-width", &focus_width,
 751                         "focus-padding", &focus_pad,
 752                         "expander-size", &expander_size,
 753                         "expander-spacing", &expander_spacing,
 754                         NULL);
 755
 756   ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 757
 758   x = widget->allocation.x + border_width;
 759   y = widget->allocation.y + border_width;
 760
 761   if (ltr && interior_focus)
 762     x += expander_spacing * 2 + expander_size;
 763
 764   width = height = 0;
 765
 766   if (priv->label_widget && GTK_WIDGET_VISIBLE (priv->label_widget))
 767     {
 768       GtkAllocation label_allocation = priv->label_widget->allocation;
 769
 770       width  = label_allocation.width;
 771       height = label_allocation.height;
 772     }
 773
 774   if (!interior_focus)
 775     {
 776       width += expander_size + 2 * expander_spacing;
 777       height = MAX (height, expander_size + 2 * expander_spacing);
 778     }
 779
 780   width  += 2 * focus_pad + 2 * focus_width;
 781   height += 2 * focus_pad + 2 * focus_width;
 782
 783   gtk_paint_focus (widget->style, widget->window, GTK_WIDGET_STATE (widget),
 784                    area, widget, "expander",
 785                    x, y, width, height);
 786 }
 787
 788 static gboolean
 789 gtk_expander_expose (GtkWidget      *widget,
 790                      GdkEventExpose *event)
 791 {
 792   if (GTK_WIDGET_DRAWABLE (widget))
 793     {
 794       GtkExpander *expander = GTK_EXPANDER (widget);
 795
 796       gtk_expander_paint (expander);
 797
 798       if (GTK_WIDGET_HAS_FOCUS (expander))
 799         gtk_expander_paint_focus (expander, &event->area);
 800
 801       if (expander->priv->label_widget)
 802         gtk_container_propagate_expose (GTK_CONTAINER (widget),
 803                                         expander->priv->label_widget,
 804                                         event);
 805
 806       GTK_WIDGET_CLASS (parent_class)->expose_event (widget, event);
 807     }
 808
 809   return FALSE;
 810 }
 811
 812 static gboolean
 813 gtk_expander_button_press (GtkWidget      *widget,
 814                            GdkEventButton *event)
 815 {
 816   GtkExpander *expander = GTK_EXPANDER (widget);
 817
 818   if (event->button == 1 && event->window == expander->priv->event_window)
 819     {
 820       expander->priv->button_down = TRUE;
 821       return TRUE;
 822     }
 823
 824   return FALSE;
 825 }
 826
 827 static gboolean
 828 gtk_expander_button_release (GtkWidget      *widget,
 829                              GdkEventButton *event)
 830 {
 831   GtkExpander *expander = GTK_EXPANDER (widget);
 832
 833   if (event->button == 1 && expander->priv->button_down)
 834     {
 835       gtk_widget_activate (widget);
 836       expander->priv->button_down = FALSE;
 837       return TRUE;
 838     }
 839
 840   return FALSE;
 841 }
 842
 843 static void
 844 gtk_expander_grab_notify (GtkWidget *widget,
 845                           gboolean   was_grabbed)
 846 {
 847   if (!was_grabbed)
 848     GTK_EXPANDER (widget)->priv->button_down = FALSE;
 849 }
 850
 851 static void
 852 gtk_expander_state_changed (GtkWidget    *widget,
 853                             GtkStateType  previous_state)
 854 {
 855   if (!GTK_WIDGET_IS_SENSITIVE (widget))
 856     GTK_EXPANDER (widget)->priv->button_down = FALSE;
 857 }
 858
 859 static void
 860 gtk_expander_redraw_expander (GtkExpander *expander)
 861 {
 862   GdkRectangle bounds;
 863
 864   get_expander_bounds (expander, &bounds);
 865
 866   gtk_widget_queue_draw_area (GTK_WIDGET (expander),
 867                               bounds.x,
 868                               bounds.y,
 869                               bounds.width,
 870                               bounds.height);
 871 }
 872
 873 static gboolean
 874 gtk_expander_enter_notify (GtkWidget        *widget,
 875                            GdkEventCrossing *event)
 876 {
 877   GtkExpander *expander = GTK_EXPANDER (widget);
 878   GtkWidget *event_widget;
 879
 880   event_widget = gtk_get_event_widget ((GdkEvent *) event);
 881
 882   if (event_widget == widget &&
 883       event->detail != GDK_NOTIFY_INFERIOR)
 884     {
 885       expander->priv->prelight = TRUE;
 886       gtk_expander_redraw_expander (expander);
 887     }
 888
 889   return FALSE;
 890 }
 891
 892 static gboolean
 893 gtk_expander_leave_notify (GtkWidget        *widget,
 894                            GdkEventCrossing *event)
 895 {
 896   GtkExpander *expander = GTK_EXPANDER (widget);
 897   GtkWidget *event_widget;
 898
 899   event_widget = gtk_get_event_widget ((GdkEvent *) event);
 900
 901   if (event_widget == widget &&
 902       event->detail != GDK_NOTIFY_INFERIOR)
 903     {
 904       expander->priv->prelight = FALSE;
 905       gtk_expander_redraw_expander (expander);
 906     }
 907
 908   return FALSE;
 909 }
 910
 911 typedef enum
 912 {
 913   FOCUS_NONE,
 914   FOCUS_WIDGET,
 915   FOCUS_LABEL,
 916   FOCUS_CHILD
 917 } FocusSite;
 918
 919 static gboolean
 920 focus_current_site (GtkExpander      *expander,
 921                     GtkDirectionType  direction)
 922 {
 923   GtkWidget *current_focus;
 924
 925   current_focus = GTK_CONTAINER (expander)->focus_child;
 926
 927   if (!current_focus)
 928     return FALSE;
 929
 930   return gtk_widget_child_focus (current_focus, direction);
 931 }
 932
 933 static gboolean
 934 focus_in_site (GtkExpander      *expander,
 935                FocusSite         site,
 936                GtkDirectionType  direction)
 937 {
 938   switch (site)
 939     {
 940     case FOCUS_WIDGET:
 941       gtk_widget_grab_focus (GTK_WIDGET (expander));
 942       return TRUE;
 943     case FOCUS_LABEL:
 944       if (expander->priv->label_widget)
 945         return gtk_widget_child_focus (expander->priv->label_widget, direction);
 946       else
 947         return FALSE;
 948     case FOCUS_CHILD:
 949       {
 950         GtkWidget *child = gtk_bin_get_child (GTK_BIN (expander));
 951
 952         if (child && GTK_WIDGET_CHILD_VISIBLE (child))
 953           return gtk_widget_child_focus (child, direction);
 954         else
 955           return FALSE;
 956       }
 957     case FOCUS_NONE:
 958       break;
 959     }
 960
 961   g_assert_not_reached ();
 962   return FALSE;
 963 }
 964
 965 static FocusSite
 966 get_next_site (GtkExpander      *expander,
 967                FocusSite         site,
 968                GtkDirectionType  direction)
 969 {
 970   gboolean ltr;
 971
 972   ltr = gtk_widget_get_direction (GTK_WIDGET (expander)) != GTK_TEXT_DIR_RTL;
 973
 974   switch (site)
 975     {
 976     case FOCUS_NONE:
 977       switch (direction)
 978         {
 979         case GTK_DIR_TAB_BACKWARD:
 980         case GTK_DIR_LEFT:
 981         case GTK_DIR_UP:
 982           return FOCUS_CHILD;
 983         case GTK_DIR_TAB_FORWARD:
 984         case GTK_DIR_DOWN:
 985         case GTK_DIR_RIGHT:
 986           return FOCUS_WIDGET;
 987         }
 988     case FOCUS_WIDGET:
 989       switch (direction)
 990         {
 991         case GTK_DIR_TAB_BACKWARD:
 992         case GTK_DIR_UP:
 993           return FOCUS_NONE;
 994         case GTK_DIR_LEFT:
 995           return ltr ? FOCUS_NONE : FOCUS_LABEL;
 996         case GTK_DIR_TAB_FORWARD:
 997         case GTK_DIR_DOWN:
 998           return FOCUS_LABEL;
 999         case GTK_DIR_RIGHT:
1000           return ltr ? FOCUS_LABEL : FOCUS_NONE;
1001           break;
1002         }
1003     case FOCUS_LABEL:
1004       switch (direction)
1005         {
1006         case GTK_DIR_TAB_BACKWARD:
1007         case GTK_DIR_UP:
1008           return FOCUS_WIDGET;
1009         case GTK_DIR_LEFT:
1010           return ltr ? FOCUS_WIDGET : FOCUS_CHILD;
1011         case GTK_DIR_TAB_FORWARD:
1012         case GTK_DIR_DOWN:
1013           return FOCUS_CHILD;
1014         case GTK_DIR_RIGHT:
1015           return ltr ? FOCUS_CHILD : FOCUS_WIDGET;
1016           break;
1017         }
1018     case FOCUS_CHILD:
1019       switch (direction)
1020         {
1021         case GTK_DIR_TAB_BACKWARD:
1022         case GTK_DIR_LEFT:
1023         case GTK_DIR_UP:
1024           return FOCUS_LABEL;
1025         case GTK_DIR_TAB_FORWARD:
1026         case GTK_DIR_DOWN:
1027         case GTK_DIR_RIGHT:
1028           return FOCUS_NONE;
1029         }
1030     }
1031
1032   g_assert_not_reached ();
1033   return FOCUS_NONE;
1034 }
1035
1036 static gboolean
1037 gtk_expander_focus (GtkWidget        *widget,
1038                     GtkDirectionType  direction)
1039 {
1040   GtkExpander *expander = GTK_EXPANDER (widget);
1041
1042   if (!focus_current_site (expander, direction))
1043     {
1044       GtkWidget *old_focus_child;
1045       gboolean widget_is_focus;
1046       FocusSite site = FOCUS_NONE;
1047
1048       widget_is_focus = gtk_widget_is_focus (widget);
1049       old_focus_child = GTK_CONTAINER (widget)->focus_child;
1050
1051       if (old_focus_child && old_focus_child == expander->priv->label_widget)
1052         site = FOCUS_LABEL;
1053       else if (old_focus_child)
1054         site = FOCUS_CHILD;
1055       else if (widget_is_focus)
1056         site = FOCUS_WIDGET;
1057
1058       while ((site = get_next_site (expander, site, direction)) != FOCUS_NONE)
1059         {
1060           if (focus_in_site (expander, site, direction))
1061             return TRUE;
1062         }
1063
1064       return FALSE;
1065     }
1066
1067   return TRUE;
1068 }
1069
1070 static void
1071 gtk_expander_add (GtkContainer *container,
1072                   GtkWidget    *widget)
1073 {
1074   GTK_CONTAINER_CLASS (parent_class)->add (container, widget);
1075
1076   gtk_widget_set_child_visible (widget, GTK_EXPANDER (container)->priv->expanded);
1077   gtk_widget_queue_resize (GTK_WIDGET (container));
1078 }
1079
1080 static void
1081 gtk_expander_remove (GtkContainer *container,
1082                      GtkWidget    *widget)
1083 {
1084   GtkExpander *expander = GTK_EXPANDER (container);
1085
1086   if (GTK_EXPANDER (expander)->priv->label_widget == widget)
1087     gtk_expander_set_label_widget (expander, NULL);
1088   else
1089     GTK_CONTAINER_CLASS (parent_class)->remove (container, widget);
1090 }
1091
1092 static void
1093 gtk_expander_forall (GtkContainer *container,
1094                      gboolean      include_internals,
1095                      GtkCallback   callback,
1096                      gpointer      callback_data)
1097 {
1098   GtkBin *bin = GTK_BIN (container);
1099   GtkExpanderPrivate *priv = GTK_EXPANDER (container)->priv;
1100
1101   if (bin->child)
1102     (* callback) (bin->child, callback_data);
1103
1104   if (priv->label_widget)
1105     (* callback) (priv->label_widget, callback_data);
1106 }
1107
1108 static void
1109 gtk_expander_activate (GtkExpander *expander)
1110 {
1111   gtk_expander_set_expanded (expander, !expander->priv->expanded);
1112 }
1113
1114
1115 /**
1116  * gtk_expander_new:
1117  * @label: the text of the label
1118  *
1119  * Creates a new expander using @label as the text of the label.
1120  *
1121  * Return value: a new #GtkExpander widget.
1122  *
1123  * Since: 2.4
1124  **/
1125 GtkWidget *
1126 gtk_expander_new (const gchar *label)
1127 {
1128   return g_object_new (GTK_TYPE_EXPANDER, "label", label, NULL);
1129 }
1130
1131 /**
1132  * gtk_expander_new_with_mnemonic:
1133  * @label: the text of the label with an underscore in front of the
1134  *         mnemonic character
1135  *
1136  * Creates a new expander using @label as the text of the label.
1137  * If characters in @label are preceded by an underscore, they are underlined.
1138  * If you need a literal underscore character in a label, use '__' (two
1139  * underscores). The first underlined character represents a keyboard
1140  * accelerator called a mnemonic.
1141  * Pressing Alt and that key activates the button.
1142  *
1143  * Return value: a new #GtkExpander widget.
1144  *
1145  * Since: 2.4
1146  **/
1147 GtkWidget *
1148 gtk_expander_new_with_mnemonic (const gchar *label)
1149 {
1150   return g_object_new (GTK_TYPE_EXPANDER,
1151                        "label", label,
1152                        "use_underline", TRUE,
1153                        NULL);
1154 }
1155
1156 static gboolean
1157 gtk_expander_animation_timeout (GtkExpander *expander)
1158 {
1159   GtkExpanderPrivate *priv = expander->priv;
1160   GdkRectangle area;
1161   gboolean finish = FALSE;
1162
1163   if (GTK_WIDGET_REALIZED (expander))
1164     {
1165       get_expander_bounds (expander, &area);
1166       gdk_window_invalidate_rect (GTK_WIDGET (expander)->window, &area, TRUE);
1167     }
1168
1169   if (priv->expanded)
1170     {
1171       if (priv->expander_style == GTK_EXPANDER_COLLAPSED)
1172         {
1173           priv->expander_style = GTK_EXPANDER_SEMI_EXPANDED;
1174         }
1175       else
1176         {
1177           priv->expander_style = GTK_EXPANDER_EXPANDED;
1178           finish = TRUE;
1179         }
1180     }
1181   else
1182     {
1183       if (priv->expander_style == GTK_EXPANDER_EXPANDED)
1184         {
1185           priv->expander_style = GTK_EXPANDER_SEMI_COLLAPSED;
1186         }
1187       else
1188         {
1189           priv->expander_style = GTK_EXPANDER_COLLAPSED;
1190           finish = TRUE;
1191         }
1192     }
1193
1194   if (finish)
1195     {
1196       priv->animation_timeout = 0;
1197       if (GTK_BIN (expander)->child)
1198         gtk_widget_set_child_visible (GTK_BIN (expander)->child, priv->expanded);
1199       gtk_widget_queue_resize (GTK_WIDGET (expander));
1200     }
1201
1202   return !finish;
1203 }
1204
1205 static void
1206 gtk_expander_start_animation (GtkExpander *expander)
1207 {
1208   GtkExpanderPrivate *priv = expander->priv;
1209
1210   if (priv->animation_timeout)
1211     g_source_remove (priv->animation_timeout);
1212
1213   priv->animation_timeout =
1214                 g_timeout_add (50,
1215                                (GSourceFunc) gtk_expander_animation_timeout,
1216                                expander);
1217 }
1218
1219 /**
1220  * gtk_expander_set_expanded:
1221  * @expander: a #GtkExpander
1222  * @expanded: whether the child widget is revealed
1223  *
1224  * Sets the state of the expander. Set to %TRUE, if you want
1225  * the child widget to be revealed, and %FALSE if you want the
1226  * child widget to be hidden.
1227  *
1228  * Since: 2.4
1229  **/
1230 void
1231 gtk_expander_set_expanded (GtkExpander *expander,
1232                            gboolean     expanded)
1233 {
1234   GtkExpanderPrivate *priv;
1235
1236   g_return_if_fail (GTK_IS_EXPANDER (expander));
1237
1238   priv = expander->priv;
1239
1240   expanded = expanded != FALSE;
1241
1242   if (priv->expanded != expanded)
1243     {
1244       priv->expanded = expanded;
1245
1246       if (GTK_WIDGET_REALIZED (expander))
1247         {
1248           gtk_expander_start_animation (expander);
1249         }
1250       else
1251         {
1252           priv->expander_style = expanded ? GTK_EXPANDER_EXPANDED :
1253                                             GTK_EXPANDER_COLLAPSED;
1254
1255           if (GTK_BIN (expander)->child)
1256             {
1257               gtk_widget_set_child_visible (GTK_BIN (expander)->child, priv->expanded);
1258               gtk_widget_queue_resize (GTK_WIDGET (expander));
1259             }
1260         }
1261
1262       g_object_notify (G_OBJECT (expander), "expanded");
1263     }
1264 }
1265
1266 /**
1267  * gtk_expander_get_expanded:
1268  * @expander:a #GtkExpander
1269  *
1270  * Queries a #GtkExpander and returns its current state. Returns %TRUE
1271  * if the child widget is revealed.
1272  *
1273  * See gtk_expander_set_expanded().
1274  *
1275  * Return value: the current state of the expander.
1276  *
1277  * Since: 2.4
1278  **/
1279 gboolean
1280 gtk_expander_get_expanded (GtkExpander *expander)
1281 {
1282   g_return_val_if_fail (GTK_IS_EXPANDER (expander), FALSE);
1283
1284   return expander->priv->expanded;
1285 }
1286
1287 /**
1288  * gtk_expander_set_spacing:
1289  * @expander: a #GtkExpander
1290  * @spacing: distance between the expander and child in pixels.
1291  *
1292  * Sets the spacing field of @expander, which is the number of pixels to
1293  * place between expander and the child.
1294  *
1295  * Since: 2.4
1296  **/
1297 void
1298 gtk_expander_set_spacing (GtkExpander *expander,
1299                           gint         spacing)
1300 {
1301   g_return_if_fail (GTK_IS_EXPANDER (expander));
1302   g_return_if_fail (spacing >= 0);
1303
1304   if (expander->priv->spacing != spacing)
1305     {
1306       expander->priv->spacing = spacing;
1307
1308       gtk_widget_queue_resize (GTK_WIDGET (expander));
1309
1310       g_object_notify (G_OBJECT (expander), "spacing");
1311     }
1312 }
1313
1314 /**
1315  * gtk_expander_get_spacing:
1316  * @expander: a #GtkExpander
1317  *
1318  * Gets the value set by gtk_expander_set_spacing().
1319  *
1320  * Return value: spacing between the expander and child.
1321  *
1322  * Since: 2.4
1323  **/
1324 gint
1325 gtk_expander_get_spacing (GtkExpander *expander)
1326 {
1327   g_return_val_if_fail (GTK_IS_EXPANDER (expander), 0);
1328
1329   return expander->priv->spacing;
1330 }
1331
1332 /**
1333  * gtk_expander_set_label:
1334  * @expander: a #GtkExpander
1335  * @label: a string
1336  *
1337  * Sets the text of the label of the expander to @label.
1338  *
1339  * This will also clear any previously set labels.
1340  *
1341  * Since: 2.4
1342  **/
1343 void
1344 gtk_expander_set_label (GtkExpander *expander,
1345                         const gchar *label)
1346 {
1347   g_return_if_fail (GTK_IS_EXPANDER (expander));
1348
1349   if (!label)
1350     {
1351       gtk_expander_set_label_widget (expander, NULL);
1352     }
1353   else
1354     {
1355       GtkWidget *child;
1356
1357       child = gtk_label_new (label);
1358       gtk_label_set_use_underline (GTK_LABEL (child), expander->priv->use_underline);
1359       gtk_label_set_use_markup (GTK_LABEL (child), expander->priv->use_markup);
1360       gtk_widget_show (child);
1361
1362       gtk_expander_set_label_widget (expander, child);
1363     }
1364
1365   g_object_notify (G_OBJECT (expander), "label");
1366 }
1367
1368 /**
1369  * gtk_expander_get_label:
1370  * @expander: a #GtkExpander
1371  *
1372  * Fetches the text from the label of the expander, as set by
1373  * gtk_expander_set_label(). If the label text has not
1374  * been set the return value will be %NULL. This will be the
1375  * case if you create an empty button with gtk_button_new() to
1376  * use as a container.
1377  *
1378  * Return value: The text of the label widget. This string is owned
1379  * by the widget and must not be modified or freed.
1380  *
1381  * Since: 2.4
1382  **/
1383 G_CONST_RETURN char *
1384 gtk_expander_get_label (GtkExpander *expander)
1385 {
1386   GtkExpanderPrivate *priv;
1387
1388   g_return_val_if_fail (GTK_IS_EXPANDER (expander), NULL);
1389
1390   priv = expander->priv;
1391
1392   if (priv->label_widget && GTK_IS_LABEL (priv->label_widget))
1393     return gtk_label_get_text (GTK_LABEL (priv->label_widget));
1394   else
1395     return NULL;
1396 }
1397
1398 /**
1399  * gtk_expander_set_use_underline:
1400  * @expander: a #GtkExpander
1401  * @use_underline: %TRUE if underlines in the text indicate mnemonics
1402  *
1403  * If true, an underline in the text of the expander label indicates
1404  * the next character should be used for the mnemonic accelerator key.
1405  *
1406  * Since: 2.4
1407  **/
1408 void
1409 gtk_expander_set_use_underline (GtkExpander *expander,
1410                                 gboolean     use_underline)
1411 {
1412   GtkExpanderPrivate *priv;
1413
1414   g_return_if_fail (GTK_IS_EXPANDER (expander));
1415
1416   priv = expander->priv;
1417
1418   use_underline = use_underline != FALSE;
1419
1420   if (priv->use_underline != use_underline)
1421     {
1422       priv->use_underline = use_underline;
1423
1424       if (priv->label_widget && GTK_IS_LABEL (priv->label_widget))
1425         gtk_label_set_use_underline (GTK_LABEL (priv->label_widget), use_underline);
1426
1427       g_object_notify (G_OBJECT (expander), "use_underline");
1428     }
1429 }
1430
1431 /**
1432  * gtk_expander_get_use_underline:
1433  * @expander: a #GtkExpander
1434  *
1435  * Returns whether an embedded underline in the expander label indicates a
1436  * mnemonic. See gtk_expander_set_use_underline().
1437  *
1438  * Return value: %TRUE if an embedded underline in the expander label
1439  *               indicates the mnemonic accelerator keys.
1440  *
1441  * Since: 2.4
1442  **/
1443 gboolean
1444 gtk_expander_get_use_underline (GtkExpander *expander)
1445 {
1446   g_return_val_if_fail (GTK_IS_EXPANDER (expander), FALSE);
1447
1448   return expander->priv->use_underline;
1449 }
1450
1451 /**
1452  * gtk_expander_set_use_markup:
1453  * @expander: a #GtkExpander
1454  * @use_markup: %TRUE if the label's text should be parsed for markup
1455  *
1456  * Sets whether the text of the label contains markup in <link
1457  * linkend="PangoMarkupFormat">Pango's text markup
1458  * language</link>. See gtk_label_set_markup().
1459  *
1460  * Since: 2.4
1461  **/
1462 void
1463 gtk_expander_set_use_markup (GtkExpander *expander,
1464                              gboolean     use_markup)
1465 {
1466   GtkExpanderPrivate *priv;
1467
1468   g_return_if_fail (GTK_IS_EXPANDER (expander));
1469
1470   priv = expander->priv;
1471
1472   use_markup = use_markup != FALSE;
1473
1474   if (priv->use_markup != use_markup)
1475     {
1476       priv->use_markup = use_markup;
1477
1478       if (priv->label_widget && GTK_IS_LABEL (priv->label_widget))
1479         gtk_label_set_use_markup (GTK_LABEL (priv->label_widget), use_markup);
1480
1481       g_object_notify (G_OBJECT (expander), "use_markup");
1482     }
1483 }
1484
1485 /**
1486  * gtk_expander_get_use_markup:
1487  * @expander: a #GtkExpander
1488  *
1489  * Returns whether the label's text is interpreted as marked up with
1490  * the <link linkend="PangoMarkupFormat">Pango text markup
1491  * language</link>. See gtk_expander_set_use_markup ().
1492  *
1493  * Return value: %TRUE if the label's text will be parsed for markup
1494  *
1495  * Since: 2.4
1496  **/
1497 gboolean
1498 gtk_expander_get_use_markup (GtkExpander *expander)
1499 {
1500   g_return_val_if_fail (GTK_IS_EXPANDER (expander), FALSE);
1501
1502   return expander->priv->use_markup;
1503 }
1504
1505 /**
1506  * gtk_expander_set_label_widget:
1507  * @expander: a #GtkExpander
1508  * @label_widget: the new label widget
1509  *
1510  * Set the label widget for the expander. This is the widget
1511  * that will appear embedded alongside the expander arrow.
1512  *
1513  * Since: 2.4
1514  **/
1515 void
1516 gtk_expander_set_label_widget (GtkExpander *expander,
1517                                GtkWidget   *label_widget)
1518 {
1519   GtkExpanderPrivate *priv;
1520
1521   g_return_if_fail (GTK_IS_EXPANDER (expander));
1522   g_return_if_fail (label_widget == NULL || GTK_IS_WIDGET (label_widget));
1523   g_return_if_fail (label_widget == NULL || label_widget->parent == NULL);
1524
1525   priv = expander->priv;
1526
1527   if (priv->label_widget == label_widget)
1528     return;
1529
1530   if (priv->label_widget)
1531     gtk_widget_unparent (priv->label_widget);
1532
1533   priv->label_widget = label_widget;
1534
1535   if (label_widget)
1536     {
1537       priv->label_widget = label_widget;
1538       gtk_widget_set_parent (label_widget, GTK_WIDGET (expander));
1539     }
1540
1541   if (GTK_WIDGET_VISIBLE (expander))
1542     gtk_widget_queue_resize (GTK_WIDGET (expander));
1543
1544   g_object_freeze_notify (G_OBJECT (expander));
1545   g_object_notify (G_OBJECT (expander), "label_widget");
1546   g_object_notify (G_OBJECT (expander), "label");
1547   g_object_thaw_notify (G_OBJECT (expander));
1548 }
1549
1550 /**
1551  * gtk_expander_get_label_widget:
1552  * @expander: a #GtkExpander
1553  *
1554  * Retrieves the label widget for the frame. See
1555  * gtk_expander_set_label_widget().
1556  *
1557  * Return value: the label widget, or %NULL if there is none.
1558  *
1559  * Since: 2.4
1560  **/
1561 GtkWidget *
1562 gtk_expander_get_label_widget (GtkExpander *expander)
1563 {
1564   g_return_val_if_fail (GTK_IS_EXPANDER (expander), NULL);
1565
1566   return expander->priv->label_widget;
1567 }