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 #include <string.h>
  26 #include "gtkexpander.h"
  27
  28 #include "gtklabel.h"
  29 #include "gtkbuildable.h"
  30 #include "gtkcontainer.h"
  31 #include "gtkmarshalers.h"
  32 #include "gtkmain.h"
  33 #include "gtkintl.h"
  34 #include "gtkprivate.h"
  35 #include <gdk/gdkkeysyms.h>
  36 #include "gtkdnd.h"
  37
  38 #define GTK_EXPANDER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GTK_TYPE_EXPANDER, GtkExpanderPrivate))
  39
  40 #define DEFAULT_EXPANDER_SIZE 10
  41 #define DEFAULT_EXPANDER_SPACING 2
  42
  43 enum
  44 {
  45   PROP_0,
  46   PROP_EXPANDED,
  47   PROP_LABEL,
  48   PROP_USE_UNDERLINE,
  49   PROP_USE_MARKUP,
  50   PROP_SPACING,
  51   PROP_LABEL_WIDGET
  52 };
  53
  54 struct _GtkExpanderPrivate
  55 {
  56   GtkWidget        *label_widget;
  57   GdkWindow        *event_window;
  58   gint              spacing;
  59
  60   GtkExpanderStyle  expander_style;
  61   guint             animation_timeout;
  62   guint             expand_timer;
  63
  64   guint             expanded : 1;
  65   guint             use_underline : 1;
  66   guint             use_markup : 1;
  67   guint             button_down : 1;
  68   guint             prelight : 1;
  69 };
  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 static gboolean gtk_expander_drag_motion    (GtkWidget        *widget,
 107                                              GdkDragContext   *context,
 108                                              gint              x,
 109                                              gint              y,
 110                                              guint             time);
 111 static void     gtk_expander_drag_leave     (GtkWidget        *widget,
 112                                              GdkDragContext   *context,
 113                                              guint             time);
 114
 115 static void gtk_expander_add    (GtkContainer *container,
 116                                  GtkWidget    *widget);
 117 static void gtk_expander_remove (GtkContainer *container,
 118                                  GtkWidget    *widget);
 119 static void gtk_expander_forall (GtkContainer *container,
 120                                  gboolean        include_internals,
 121                                  GtkCallback     callback,
 122                                  gpointer        callback_data);
 123
 124 static void gtk_expander_activate (GtkExpander *expander);
 125
 126 static void get_expander_bounds (GtkExpander  *expander,
 127                                  GdkRectangle *rect);
 128
 129 /* GtkBuildable */
 130 static void gtk_expander_buildable_init           (GtkBuildableIface *iface);
 131 static void gtk_expander_buildable_add_child      (GtkBuildable *buildable,
 132                                                    GtkBuilder   *builder,
 133                                                    GObject      *child,
 134                                                    const gchar  *type);
 135
 136 G_DEFINE_TYPE_WITH_CODE (GtkExpander, gtk_expander, GTK_TYPE_BIN,
 137                          G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
 138                                                 gtk_expander_buildable_init))
 139
 140 static void
 141 gtk_expander_class_init (GtkExpanderClass *klass)
 142 {
 143   GObjectClass *gobject_class;
 144   GtkObjectClass *object_class;
 145   GtkWidgetClass *widget_class;
 146   GtkContainerClass *container_class;
 147
 148   gobject_class   = (GObjectClass *) klass;
 149   object_class    = (GtkObjectClass *) klass;
 150   widget_class    = (GtkWidgetClass *) klass;
 151   container_class = (GtkContainerClass *) klass;
 152
 153   gobject_class->set_property = gtk_expander_set_property;
 154   gobject_class->get_property = gtk_expander_get_property;
 155
 156   object_class->destroy = gtk_expander_destroy;
 157
 158   widget_class->realize              = gtk_expander_realize;
 159   widget_class->unrealize            = gtk_expander_unrealize;
 160   widget_class->size_request         = gtk_expander_size_request;
 161   widget_class->size_allocate        = gtk_expander_size_allocate;
 162   widget_class->map                  = gtk_expander_map;
 163   widget_class->unmap                = gtk_expander_unmap;
 164   widget_class->expose_event         = gtk_expander_expose;
 165   widget_class->button_press_event   = gtk_expander_button_press;
 166   widget_class->button_release_event = gtk_expander_button_release;
 167   widget_class->enter_notify_event   = gtk_expander_enter_notify;
 168   widget_class->leave_notify_event   = gtk_expander_leave_notify;
 169   widget_class->focus                = gtk_expander_focus;
 170   widget_class->grab_notify          = gtk_expander_grab_notify;
 171   widget_class->state_changed        = gtk_expander_state_changed;
 172   widget_class->drag_motion          = gtk_expander_drag_motion;
 173   widget_class->drag_leave           = gtk_expander_drag_leave;
 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                                                          P_("Expanded"),
 187                                                          P_("Whether the expander has been opened to reveal the child widget"),
 188                                                          FALSE,
 189                                                          GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 190
 191   g_object_class_install_property (gobject_class,
 192                                    PROP_LABEL,
 193                                    g_param_spec_string ("label",
 194                                                         P_("Label"),
 195                                                         P_("Text of the expander's label"),
 196                                                         NULL,
 197                                                         GTK_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                                                          P_("Use underline"),
 203                                                          P_("If set, an underline in the text indicates the next character should be used for the mnemonic accelerator key"),
 204                                                          FALSE,
 205                                                          GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 206
 207   g_object_class_install_property (gobject_class,
 208                                    PROP_USE_MARKUP,
 209                                    g_param_spec_boolean ("use-markup",
 210                                                          P_("Use markup"),
 211                                                          P_("The text of the label includes XML markup. See pango_parse_markup()"),
 212                                                          FALSE,
 213                                                          GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 214
 215   g_object_class_install_property (gobject_class,
 216                                    PROP_SPACING,
 217                                    g_param_spec_int ("spacing",
 218                                                      P_("Spacing"),
 219                                                      P_("Space to put between the label and the child"),
 220                                                      0,
 221                                                      G_MAXINT,
 222                                                      0,
 223                                                      GTK_PARAM_READWRITE));
 224
 225   g_object_class_install_property (gobject_class,
 226                                    PROP_LABEL_WIDGET,
 227                                    g_param_spec_object ("label-widget",
 228                                                         P_("Label widget"),
 229                                                         P_("A widget to display in place of the usual expander label"),
 230                                                         GTK_TYPE_WIDGET,
 231                                                         GTK_PARAM_READWRITE));
 232
 233   gtk_widget_class_install_style_property (widget_class,
 234                                            g_param_spec_int ("expander-size",
 235                                                              P_("Expander Size"),
 236                                                              P_("Size of the expander arrow"),
 237                                                              0,
 238                                                              G_MAXINT,
 239                                                              DEFAULT_EXPANDER_SIZE,
 240                                                              GTK_PARAM_READABLE));
 241
 242   gtk_widget_class_install_style_property (widget_class,
 243                                            g_param_spec_int ("expander-spacing",
 244                                                              P_("Indicator Spacing"),
 245                                                              P_("Spacing around expander arrow"),
 246                                                              0,
 247                                                              G_MAXINT,
 248                                                              DEFAULT_EXPANDER_SPACING,
 249                                                              GTK_PARAM_READABLE));
 250
 251   widget_class->activate_signal =
 252     g_signal_new (I_("activate"),
 253                   G_TYPE_FROM_CLASS (gobject_class),
 254                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 255                   G_STRUCT_OFFSET (GtkExpanderClass, activate),
 256                   NULL, NULL,
 257                   _gtk_marshal_VOID__VOID,
 258                   G_TYPE_NONE, 0);
 259 }
 260
 261 static void
 262 gtk_expander_init (GtkExpander *expander)
 263 {
 264   GtkExpanderPrivate *priv;
 265
 266   expander->priv = priv = GTK_EXPANDER_GET_PRIVATE (expander);
 267
 268   gtk_widget_set_can_focus (GTK_WIDGET (expander), TRUE);
 269   gtk_widget_set_has_window (GTK_WIDGET (expander), FALSE);
 270
 271   priv->label_widget = NULL;
 272   priv->event_window = NULL;
 273   priv->spacing = 0;
 274
 275   priv->expander_style = GTK_EXPANDER_COLLAPSED;
 276   priv->animation_timeout = 0;
 277
 278   priv->expanded = FALSE;
 279   priv->use_underline = FALSE;
 280   priv->use_markup = FALSE;
 281   priv->button_down = FALSE;
 282   priv->prelight = FALSE;
 283   priv->expand_timer = 0;
 284
 285   gtk_drag_dest_set (GTK_WIDGET (expander), 0, NULL, 0, 0);
 286   gtk_drag_dest_set_track_motion (GTK_WIDGET (expander), TRUE);
 287 }
 288
 289 static void
 290 gtk_expander_buildable_add_child (GtkBuildable  *buildable,
 291                                   GtkBuilder    *builder,
 292                                   GObject       *child,
 293                                   const gchar   *type)
 294 {
 295   if (!type)
 296     gtk_container_add (GTK_CONTAINER (buildable), GTK_WIDGET (child));
 297   else if (strcmp (type, "label") == 0)
 298     gtk_expander_set_label_widget (GTK_EXPANDER (buildable), GTK_WIDGET (child));
 299   else
 300     GTK_BUILDER_WARN_INVALID_CHILD_TYPE (GTK_EXPANDER (buildable), type);
 301 }
 302
 303 static void
 304 gtk_expander_buildable_init (GtkBuildableIface *iface)
 305 {
 306   iface->add_child = gtk_expander_buildable_add_child;
 307 }
 308
 309 static void
 310 gtk_expander_set_property (GObject      *object,
 311                            guint         prop_id,
 312                            const GValue *value,
 313                            GParamSpec   *pspec)
 314 {
 315   GtkExpander *expander = GTK_EXPANDER (object);
 316
 317   switch (prop_id)
 318     {
 319     case PROP_EXPANDED:
 320       gtk_expander_set_expanded (expander, g_value_get_boolean (value));
 321       break;
 322     case PROP_LABEL:
 323       gtk_expander_set_label (expander, g_value_get_string (value));
 324       break;
 325     case PROP_USE_UNDERLINE:
 326       gtk_expander_set_use_underline (expander, g_value_get_boolean (value));
 327       break;
 328     case PROP_USE_MARKUP:
 329       gtk_expander_set_use_markup (expander, g_value_get_boolean (value));
 330       break;
 331     case PROP_SPACING:
 332       gtk_expander_set_spacing (expander, g_value_get_int (value));
 333       break;
 334     case PROP_LABEL_WIDGET:
 335       gtk_expander_set_label_widget (expander, g_value_get_object (value));
 336       break;
 337     default:
 338       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 339       break;
 340     }
 341 }
 342
 343 static void
 344 gtk_expander_get_property (GObject    *object,
 345                            guint       prop_id,
 346                            GValue     *value,
 347                            GParamSpec *pspec)
 348 {
 349   GtkExpander *expander = GTK_EXPANDER (object);
 350   GtkExpanderPrivate *priv = expander->priv;
 351
 352   switch (prop_id)
 353     {
 354     case PROP_EXPANDED:
 355       g_value_set_boolean (value, priv->expanded);
 356       break;
 357     case PROP_LABEL:
 358       g_value_set_string (value, gtk_expander_get_label (expander));
 359       break;
 360     case PROP_USE_UNDERLINE:
 361       g_value_set_boolean (value, priv->use_underline);
 362       break;
 363     case PROP_USE_MARKUP:
 364       g_value_set_boolean (value, priv->use_markup);
 365       break;
 366     case PROP_SPACING:
 367       g_value_set_int (value, priv->spacing);
 368       break;
 369     case PROP_LABEL_WIDGET:
 370       g_value_set_object (value,
 371                           priv->label_widget ?
 372                           G_OBJECT (priv->label_widget) : NULL);
 373       break;
 374     default:
 375       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 376       break;
 377     }
 378 }
 379
 380 static void
 381 gtk_expander_destroy (GtkObject *object)
 382 {
 383   GtkExpanderPrivate *priv = GTK_EXPANDER (object)->priv;
 384
 385   if (priv->animation_timeout)
 386     {
 387       g_source_remove (priv->animation_timeout);
 388       priv->animation_timeout = 0;
 389     }
 390
 391   GTK_OBJECT_CLASS (gtk_expander_parent_class)->destroy (object);
 392 }
 393
 394 static void
 395 gtk_expander_realize (GtkWidget *widget)
 396 {
 397   GtkExpanderPrivate *priv;
 398   GdkWindowAttr attributes;
 399   gint attributes_mask;
 400   gint border_width;
 401   GdkRectangle expander_rect;
 402   gint label_height;
 403
 404   priv = GTK_EXPANDER (widget)->priv;
 405   gtk_widget_set_realized (widget, TRUE);
 406
 407   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 408
 409   get_expander_bounds (GTK_EXPANDER (widget), &expander_rect);
 410
 411   if (priv->label_widget && gtk_widget_get_visible (priv->label_widget))
 412     {
 413       GtkRequisition label_requisition;
 414
 415       gtk_widget_get_child_requisition (priv->label_widget, &label_requisition);
 416       label_height = label_requisition.height;
 417     }
 418   else
 419     label_height = 0;
 420
 421   attributes.window_type = GDK_WINDOW_CHILD;
 422   attributes.x = widget->allocation.x + border_width;
 423   attributes.y = widget->allocation.y + border_width;
 424   attributes.width = MAX (widget->allocation.width - 2 * border_width, 1);
 425   attributes.height = MAX (expander_rect.height, label_height - 2 * border_width);
 426   attributes.wclass = GDK_INPUT_ONLY;
 427   attributes.event_mask = gtk_widget_get_events (widget)     |
 428                                 GDK_BUTTON_PRESS_MASK        |
 429                                 GDK_BUTTON_RELEASE_MASK      |
 430                                 GDK_ENTER_NOTIFY_MASK        |
 431                                 GDK_LEAVE_NOTIFY_MASK;
 432
 433   attributes_mask = GDK_WA_X | GDK_WA_Y;
 434
 435   widget->window = gtk_widget_get_parent_window (widget);
 436   g_object_ref (widget->window);
 437
 438   priv->event_window = gdk_window_new (gtk_widget_get_parent_window (widget),
 439                                        &attributes, attributes_mask);
 440   gdk_window_set_user_data (priv->event_window, widget);
 441
 442   widget->style = gtk_style_attach (widget->style, widget->window);
 443 }
 444
 445 static void
 446 gtk_expander_unrealize (GtkWidget *widget)
 447 {
 448   GtkExpanderPrivate *priv = GTK_EXPANDER (widget)->priv;
 449
 450   if (priv->event_window)
 451     {
 452       gdk_window_set_user_data (priv->event_window, NULL);
 453       gdk_window_destroy (priv->event_window);
 454       priv->event_window = NULL;
 455     }
 456
 457   GTK_WIDGET_CLASS (gtk_expander_parent_class)->unrealize (widget);
 458 }
 459
 460 static void
 461 gtk_expander_size_request (GtkWidget      *widget,
 462                            GtkRequisition *requisition)
 463 {
 464   GtkExpander *expander;
 465   GtkBin *bin;
 466   GtkExpanderPrivate *priv;
 467   gint border_width;
 468   gint expander_size;
 469   gint expander_spacing;
 470   gboolean interior_focus;
 471   gint focus_width;
 472   gint focus_pad;
 473
 474   bin = GTK_BIN (widget);
 475   expander = GTK_EXPANDER (widget);
 476   priv = expander->priv;
 477
 478   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 479
 480   gtk_widget_style_get (widget,
 481                         "interior-focus", &interior_focus,
 482                         "focus-line-width", &focus_width,
 483                         "focus-padding", &focus_pad,
 484                         "expander-size", &expander_size,
 485                         "expander-spacing", &expander_spacing,
 486                         NULL);
 487
 488   requisition->width = expander_size + 2 * expander_spacing +
 489                        2 * focus_width + 2 * focus_pad;
 490   requisition->height = interior_focus ? (2 * focus_width + 2 * focus_pad) : 0;
 491
 492   if (priv->label_widget && gtk_widget_get_visible (priv->label_widget))
 493     {
 494       GtkRequisition label_requisition;
 495
 496       gtk_widget_size_request (priv->label_widget, &label_requisition);
 497
 498       requisition->width  += label_requisition.width;
 499       requisition->height += label_requisition.height;
 500     }
 501
 502   requisition->height = MAX (expander_size + 2 * expander_spacing, requisition->height);
 503
 504   if (!interior_focus)
 505     requisition->height += 2 * focus_width + 2 * focus_pad;
 506
 507   if (bin->child && GTK_WIDGET_CHILD_VISIBLE (bin->child))
 508     {
 509       GtkRequisition child_requisition;
 510
 511       gtk_widget_size_request (bin->child, &child_requisition);
 512
 513       requisition->width = MAX (requisition->width, child_requisition.width);
 514       requisition->height += child_requisition.height + priv->spacing;
 515     }
 516
 517   requisition->width  += 2 * border_width;
 518   requisition->height += 2 * border_width;
 519 }
 520
 521 static void
 522 get_expander_bounds (GtkExpander  *expander,
 523                      GdkRectangle *rect)
 524 {
 525   GtkWidget *widget;
 526   GtkExpanderPrivate *priv;
 527   gint border_width;
 528   gint expander_size;
 529   gint expander_spacing;
 530   gboolean interior_focus;
 531   gint focus_width;
 532   gint focus_pad;
 533   gboolean ltr;
 534
 535   widget = GTK_WIDGET (expander);
 536   priv = expander->priv;
 537
 538   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 539
 540   gtk_widget_style_get (widget,
 541                         "interior-focus", &interior_focus,
 542                         "focus-line-width", &focus_width,
 543                         "focus-padding", &focus_pad,
 544                         "expander-size", &expander_size,
 545                         "expander-spacing", &expander_spacing,
 546                         NULL);
 547
 548   ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 549
 550   rect->x = widget->allocation.x + border_width;
 551   rect->y = widget->allocation.y + border_width;
 552
 553   if (ltr)
 554     rect->x += expander_spacing;
 555   else
 556     rect->x += widget->allocation.width - 2 * border_width -
 557                expander_spacing - expander_size;
 558
 559   if (priv->label_widget && gtk_widget_get_visible (priv->label_widget))
 560     {
 561       GtkAllocation label_allocation;
 562
 563       label_allocation = priv->label_widget->allocation;
 564
 565       if (expander_size < label_allocation.height)
 566         rect->y += focus_width + focus_pad + (label_allocation.height - expander_size) / 2;
 567       else
 568         rect->y += expander_spacing;
 569     }
 570   else
 571     {
 572       rect->y += expander_spacing;
 573     }
 574
 575   if (!interior_focus)
 576     {
 577       if (ltr)
 578         rect->x += focus_width + focus_pad;
 579       else
 580         rect->x -= focus_width + focus_pad;
 581       rect->y += focus_width + focus_pad;
 582     }
 583
 584   rect->width = rect->height = expander_size;
 585 }
 586
 587 static void
 588 gtk_expander_size_allocate (GtkWidget     *widget,
 589                             GtkAllocation *allocation)
 590 {
 591   GtkExpander *expander;
 592   GtkBin *bin;
 593   GtkExpanderPrivate *priv;
 594   GtkRequisition child_requisition;
 595   gboolean child_visible = FALSE;
 596   guint border_width;
 597   gint expander_size;
 598   gint expander_spacing;
 599   gboolean interior_focus;
 600   gint focus_width;
 601   gint focus_pad;
 602   gint label_height;
 603
 604   expander = GTK_EXPANDER (widget);
 605   bin = GTK_BIN (widget);
 606   priv = expander->priv;
 607
 608   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 609
 610   gtk_widget_style_get (widget,
 611                         "interior-focus", &interior_focus,
 612                         "focus-line-width", &focus_width,
 613                         "focus-padding", &focus_pad,
 614                         "expander-size", &expander_size,
 615                         "expander-spacing", &expander_spacing,
 616                         NULL);
 617
 618   child_requisition.width = 0;
 619   child_requisition.height = 0;
 620   if (bin->child && GTK_WIDGET_CHILD_VISIBLE (bin->child))
 621     {
 622       child_visible = TRUE;
 623       gtk_widget_get_child_requisition (bin->child, &child_requisition);
 624     }
 625
 626   widget->allocation = *allocation;
 627
 628   if (priv->label_widget && gtk_widget_get_visible (priv->label_widget))
 629     {
 630       GtkAllocation label_allocation;
 631       GtkRequisition label_requisition;
 632       gboolean ltr;
 633
 634       gtk_widget_get_child_requisition (priv->label_widget, &label_requisition);
 635
 636       ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 637
 638       if (ltr)
 639         label_allocation.x = (widget->allocation.x +
 640                               border_width + focus_width + focus_pad +
 641                               expander_size + 2 * expander_spacing);
 642       else
 643         label_allocation.x = (widget->allocation.x + widget->allocation.width -
 644                               (label_requisition.width +
 645                                border_width + focus_width + focus_pad +
 646                                expander_size + 2 * expander_spacing));
 647
 648       label_allocation.y = widget->allocation.y + border_width + focus_width + focus_pad;
 649
 650       label_allocation.width = MIN (label_requisition.width,
 651                                     allocation->width - 2 * border_width -
 652                                     expander_size - 2 * expander_spacing -
 653                                     2 * focus_width - 2 * focus_pad);
 654       label_allocation.width = MAX (label_allocation.width, 1);
 655
 656       label_allocation.height = MIN (label_requisition.height,
 657                                      allocation->height - 2 * border_width -
 658                                      2 * focus_width - 2 * focus_pad -
 659                                      (child_visible ? priv->spacing : 0));
 660       label_allocation.height = MAX (label_allocation.height, 1);
 661
 662       gtk_widget_size_allocate (priv->label_widget, &label_allocation);
 663
 664       label_height = label_allocation.height;
 665     }
 666   else
 667     {
 668       label_height = 0;
 669     }
 670
 671   if (gtk_widget_get_realized (widget))
 672     {
 673       GdkRectangle rect;
 674
 675       get_expander_bounds (expander, &rect);
 676
 677       gdk_window_move_resize (priv->event_window,
 678                               allocation->x + border_width,
 679                               allocation->y + border_width,
 680                               MAX (allocation->width - 2 * border_width, 1),
 681                               MAX (rect.height, label_height - 2 * border_width));
 682     }
 683
 684   if (child_visible)
 685     {
 686       GtkAllocation child_allocation;
 687       gint top_height;
 688
 689       top_height = MAX (2 * expander_spacing + expander_size,
 690                         label_height +
 691                         (interior_focus ? 2 * focus_width + 2 * focus_pad : 0));
 692
 693       child_allocation.x = widget->allocation.x + border_width;
 694       child_allocation.y = widget->allocation.y + border_width + top_height + priv->spacing;
 695
 696       if (!interior_focus)
 697         child_allocation.y += 2 * focus_width + 2 * focus_pad;
 698
 699       child_allocation.width = MAX (allocation->width - 2 * border_width, 1);
 700
 701       child_allocation.height = allocation->height - top_height -
 702                                 2 * border_width - priv->spacing -
 703                                 (!interior_focus ? 2 * focus_width + 2 * focus_pad : 0);
 704       child_allocation.height = MAX (child_allocation.height, 1);
 705
 706       gtk_widget_size_allocate (bin->child, &child_allocation);
 707     }
 708 }
 709
 710 static void
 711 gtk_expander_map (GtkWidget *widget)
 712 {
 713   GtkExpanderPrivate *priv = GTK_EXPANDER (widget)->priv;
 714
 715   if (priv->label_widget)
 716     gtk_widget_map (priv->label_widget);
 717
 718   GTK_WIDGET_CLASS (gtk_expander_parent_class)->map (widget);
 719
 720   if (priv->event_window)
 721     gdk_window_show (priv->event_window);
 722 }
 723
 724 static void
 725 gtk_expander_unmap (GtkWidget *widget)
 726 {
 727   GtkExpanderPrivate *priv = GTK_EXPANDER (widget)->priv;
 728
 729   if (priv->event_window)
 730     gdk_window_hide (priv->event_window);
 731
 732   GTK_WIDGET_CLASS (gtk_expander_parent_class)->unmap (widget);
 733
 734   if (priv->label_widget)
 735     gtk_widget_unmap (priv->label_widget);
 736 }
 737
 738 static void
 739 gtk_expander_paint_prelight (GtkExpander *expander)
 740 {
 741   GtkWidget *widget;
 742   GtkContainer *container;
 743   GtkExpanderPrivate *priv;
 744   GdkRectangle area;
 745   gboolean interior_focus;
 746   int focus_width;
 747   int focus_pad;
 748   int expander_size;
 749   int expander_spacing;
 750   guint border_width;
 751
 752   priv = expander->priv;
 753   widget = GTK_WIDGET (expander);
 754   container = GTK_CONTAINER (expander);
 755
 756   gtk_widget_style_get (widget,
 757                         "interior-focus", &interior_focus,
 758                         "focus-line-width", &focus_width,
 759                         "focus-padding", &focus_pad,
 760                         "expander-size", &expander_size,
 761                         "expander-spacing", &expander_spacing,
 762                         NULL);
 763
 764   border_width = gtk_container_get_border_width (container);
 765   area.x = widget->allocation.x + border_width;
 766   area.y = widget->allocation.y + border_width;
 767   area.width = widget->allocation.width - (2 * border_width);
 768
 769   if (priv->label_widget && gtk_widget_get_visible (priv->label_widget))
 770     area.height = priv->label_widget->allocation.height;
 771   else
 772     area.height = 0;
 773
 774   area.height += interior_focus ? (focus_width + focus_pad) * 2 : 0;
 775   area.height = MAX (area.height, expander_size + 2 * expander_spacing);
 776   area.height += !interior_focus ? (focus_width + focus_pad) * 2 : 0;
 777
 778   gtk_paint_flat_box (widget->style, widget->window,
 779                       GTK_STATE_PRELIGHT,
 780                       GTK_SHADOW_ETCHED_OUT,
 781                       &area, widget, "expander",
 782                       area.x, area.y,
 783                       area.width, area.height);
 784 }
 785
 786 static void
 787 gtk_expander_paint (GtkExpander *expander)
 788 {
 789   GtkWidget *widget;
 790   GdkRectangle clip;
 791   GtkStateType state;
 792
 793   widget = GTK_WIDGET (expander);
 794
 795   get_expander_bounds (expander, &clip);
 796
 797   state = widget->state;
 798   if (expander->priv->prelight)
 799     {
 800       state = GTK_STATE_PRELIGHT;
 801
 802       gtk_expander_paint_prelight (expander);
 803     }
 804
 805   gtk_paint_expander (widget->style,
 806                       widget->window,
 807                       state,
 808                       &clip,
 809                       widget,
 810                       "expander",
 811                       clip.x + clip.width / 2,
 812                       clip.y + clip.height / 2,
 813                       expander->priv->expander_style);
 814 }
 815
 816 static void
 817 gtk_expander_paint_focus (GtkExpander  *expander,
 818                           GdkRectangle *area)
 819 {
 820   GtkWidget *widget;
 821   GtkExpanderPrivate *priv;
 822   GdkRectangle rect;
 823   gint x, y, width, height;
 824   gboolean interior_focus;
 825   gint border_width;
 826   gint focus_width;
 827   gint focus_pad;
 828   gint expander_size;
 829   gint expander_spacing;
 830   gboolean ltr;
 831
 832   widget = GTK_WIDGET (expander);
 833   priv = expander->priv;
 834
 835   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 836
 837   gtk_widget_style_get (widget,
 838                         "interior-focus", &interior_focus,
 839                         "focus-line-width", &focus_width,
 840                         "focus-padding", &focus_pad,
 841                         "expander-size", &expander_size,
 842                         "expander-spacing", &expander_spacing,
 843                         NULL);
 844
 845   ltr = gtk_widget_get_direction (widget) != GTK_TEXT_DIR_RTL;
 846
 847   width = height = 0;
 848
 849   if (priv->label_widget)
 850     {
 851       if (gtk_widget_get_visible (priv->label_widget))
 852         {
 853           GtkAllocation label_allocation = priv->label_widget->allocation;
 854
 855           width  = label_allocation.width;
 856           height = label_allocation.height;
 857         }
 858
 859       width  += 2 * focus_pad + 2 * focus_width;
 860       height += 2 * focus_pad + 2 * focus_width;
 861
 862       x = widget->allocation.x + border_width;
 863       y = widget->allocation.y + border_width;
 864
 865       if (ltr)
 866         {
 867           if (interior_focus)
 868             x += expander_spacing * 2 + expander_size;
 869         }
 870       else
 871         {
 872           x += widget->allocation.width - 2 * border_width
 873             - expander_spacing * 2 - expander_size - width;
 874         }
 875
 876       if (!interior_focus)
 877         {
 878           width += expander_size + 2 * expander_spacing;
 879           height = MAX (height, expander_size + 2 * expander_spacing);
 880         }
 881     }
 882   else
 883     {
 884       get_expander_bounds (expander, &rect);
 885
 886       x = rect.x - focus_pad;
 887       y = rect.y - focus_pad;
 888       width = rect.width + 2 * focus_pad;
 889       height = rect.height + 2 * focus_pad;
 890     }
 891
 892   gtk_paint_focus (widget->style, widget->window, gtk_widget_get_state (widget),
 893                    area, widget, "expander",
 894                    x, y, width, height);
 895 }
 896
 897 static gboolean
 898 gtk_expander_expose (GtkWidget      *widget,
 899                      GdkEventExpose *event)
 900 {
 901   if (gtk_widget_is_drawable (widget))
 902     {
 903       GtkExpander *expander = GTK_EXPANDER (widget);
 904
 905       gtk_expander_paint (expander);
 906
 907       if (gtk_widget_has_focus (widget))
 908         gtk_expander_paint_focus (expander, &event->area);
 909
 910       GTK_WIDGET_CLASS (gtk_expander_parent_class)->expose_event (widget, event);
 911     }
 912
 913   return FALSE;
 914 }
 915
 916 static gboolean
 917 gtk_expander_button_press (GtkWidget      *widget,
 918                            GdkEventButton *event)
 919 {
 920   GtkExpander *expander = GTK_EXPANDER (widget);
 921
 922   if (event->button == 1 && event->window == expander->priv->event_window)
 923     {
 924       expander->priv->button_down = TRUE;
 925       return TRUE;
 926     }
 927
 928   return FALSE;
 929 }
 930
 931 static gboolean
 932 gtk_expander_button_release (GtkWidget      *widget,
 933                              GdkEventButton *event)
 934 {
 935   GtkExpander *expander = GTK_EXPANDER (widget);
 936
 937   if (event->button == 1 && expander->priv->button_down)
 938     {
 939       gtk_widget_activate (widget);
 940       expander->priv->button_down = FALSE;
 941       return TRUE;
 942     }
 943
 944   return FALSE;
 945 }
 946
 947 static void
 948 gtk_expander_grab_notify (GtkWidget *widget,
 949                           gboolean   was_grabbed)
 950 {
 951   if (!was_grabbed)
 952     GTK_EXPANDER (widget)->priv->button_down = FALSE;
 953 }
 954
 955 static void
 956 gtk_expander_state_changed (GtkWidget    *widget,
 957                             GtkStateType  previous_state)
 958 {
 959   if (!gtk_widget_is_sensitive (widget))
 960     GTK_EXPANDER (widget)->priv->button_down = FALSE;
 961 }
 962
 963 static void
 964 gtk_expander_redraw_expander (GtkExpander *expander)
 965 {
 966   GtkWidget *widget;
 967
 968   widget = GTK_WIDGET (expander);
 969
 970   if (gtk_widget_get_realized (widget))
 971     gdk_window_invalidate_rect (widget->window, &widget->allocation, FALSE);
 972 }
 973
 974 static gboolean
 975 gtk_expander_enter_notify (GtkWidget        *widget,
 976                            GdkEventCrossing *event)
 977 {
 978   GtkExpander *expander = GTK_EXPANDER (widget);
 979   GtkWidget *event_widget;
 980
 981   event_widget = gtk_get_event_widget ((GdkEvent *) event);
 982
 983   if (event_widget == widget &&
 984       event->detail != GDK_NOTIFY_INFERIOR)
 985     {
 986       expander->priv->prelight = TRUE;
 987
 988       if (expander->priv->label_widget)
 989         gtk_widget_set_state (expander->priv->label_widget, GTK_STATE_PRELIGHT);
 990
 991       gtk_expander_redraw_expander (expander);
 992     }
 993
 994   return FALSE;
 995 }
 996
 997 static gboolean
 998 gtk_expander_leave_notify (GtkWidget        *widget,
 999                            GdkEventCrossing *event)
1000 {
1001   GtkExpander *expander = GTK_EXPANDER (widget);
1002   GtkWidget *event_widget;
1003
1004   event_widget = gtk_get_event_widget ((GdkEvent *) event);
1005
1006   if (event_widget == widget &&
1007       event->detail != GDK_NOTIFY_INFERIOR)
1008     {
1009       expander->priv->prelight = FALSE;
1010
1011       if (expander->priv->label_widget)
1012         gtk_widget_set_state (expander->priv->label_widget, GTK_STATE_NORMAL);
1013
1014       gtk_expander_redraw_expander (expander);
1015     }
1016
1017   return FALSE;
1018 }
1019
1020 static gboolean
1021 expand_timeout (gpointer data)
1022 {
1023   GtkExpander *expander = GTK_EXPANDER (data);
1024   GtkExpanderPrivate *priv = expander->priv;
1025
1026   priv->expand_timer = 0;
1027   gtk_expander_set_expanded (expander, TRUE);
1028
1029   return FALSE;
1030 }
1031
1032 static gboolean
1033 gtk_expander_drag_motion (GtkWidget        *widget,
1034                           GdkDragContext   *context,
1035                           gint              x,
1036                           gint              y,
1037                           guint             time)
1038 {
1039   GtkExpander *expander = GTK_EXPANDER (widget);
1040   GtkExpanderPrivate *priv = expander->priv;
1041
1042   if (!priv->expanded && !priv->expand_timer)
1043     {
1044       GtkSettings *settings;
1045       guint timeout;
1046
1047       settings = gtk_widget_get_settings (widget);
1048       g_object_get (settings, "gtk-timeout-expand", &timeout, NULL);
1049
1050       priv->expand_timer = gdk_threads_add_timeout (timeout, (GSourceFunc) expand_timeout, expander);
1051     }
1052
1053   return TRUE;
1054 }
1055
1056 static void
1057 gtk_expander_drag_leave (GtkWidget      *widget,
1058                          GdkDragContext *context,
1059                          guint           time)
1060 {
1061   GtkExpander *expander = GTK_EXPANDER (widget);
1062   GtkExpanderPrivate *priv = expander->priv;
1063
1064   if (priv->expand_timer)
1065     {
1066       g_source_remove (priv->expand_timer);
1067       priv->expand_timer = 0;
1068     }
1069 }
1070
1071 typedef enum
1072 {
1073   FOCUS_NONE,
1074   FOCUS_WIDGET,
1075   FOCUS_LABEL,
1076   FOCUS_CHILD
1077 } FocusSite;
1078
1079 static gboolean
1080 focus_current_site (GtkExpander      *expander,
1081                     GtkDirectionType  direction)
1082 {
1083   GtkWidget *current_focus;
1084
1085   current_focus = gtk_container_get_focus_child (GTK_CONTAINER (expander));
1086
1087   if (!current_focus)
1088     return FALSE;
1089
1090   return gtk_widget_child_focus (current_focus, direction);
1091 }
1092
1093 static gboolean
1094 focus_in_site (GtkExpander      *expander,
1095                FocusSite         site,
1096                GtkDirectionType  direction)
1097 {
1098   switch (site)
1099     {
1100     case FOCUS_WIDGET:
1101       gtk_widget_grab_focus (GTK_WIDGET (expander));
1102       return TRUE;
1103     case FOCUS_LABEL:
1104       if (expander->priv->label_widget)
1105         return gtk_widget_child_focus (expander->priv->label_widget, direction);
1106       else
1107         return FALSE;
1108     case FOCUS_CHILD:
1109       {
1110         GtkWidget *child = gtk_bin_get_child (GTK_BIN (expander));
1111
1112         if (child && GTK_WIDGET_CHILD_VISIBLE (child))
1113           return gtk_widget_child_focus (child, direction);
1114         else
1115           return FALSE;
1116       }
1117     case FOCUS_NONE:
1118       break;
1119     }
1120
1121   g_assert_not_reached ();
1122   return FALSE;
1123 }
1124
1125 static FocusSite
1126 get_next_site (GtkExpander      *expander,
1127                FocusSite         site,
1128                GtkDirectionType  direction)
1129 {
1130   gboolean ltr;
1131
1132   ltr = gtk_widget_get_direction (GTK_WIDGET (expander)) != GTK_TEXT_DIR_RTL;
1133
1134   switch (site)
1135     {
1136     case FOCUS_NONE:
1137       switch (direction)
1138         {
1139         case GTK_DIR_TAB_BACKWARD:
1140         case GTK_DIR_LEFT:
1141         case GTK_DIR_UP:
1142           return FOCUS_CHILD;
1143         case GTK_DIR_TAB_FORWARD:
1144         case GTK_DIR_DOWN:
1145         case GTK_DIR_RIGHT:
1146           return FOCUS_WIDGET;
1147         }
1148     case FOCUS_WIDGET:
1149       switch (direction)
1150         {
1151         case GTK_DIR_TAB_BACKWARD:
1152         case GTK_DIR_UP:
1153           return FOCUS_NONE;
1154         case GTK_DIR_LEFT:
1155           return ltr ? FOCUS_NONE : FOCUS_LABEL;
1156         case GTK_DIR_TAB_FORWARD:
1157         case GTK_DIR_DOWN:
1158           return FOCUS_LABEL;
1159         case GTK_DIR_RIGHT:
1160           return ltr ? FOCUS_LABEL : FOCUS_NONE;
1161           break;
1162         }
1163     case FOCUS_LABEL:
1164       switch (direction)
1165         {
1166         case GTK_DIR_TAB_BACKWARD:
1167         case GTK_DIR_UP:
1168           return FOCUS_WIDGET;
1169         case GTK_DIR_LEFT:
1170           return ltr ? FOCUS_WIDGET : FOCUS_CHILD;
1171         case GTK_DIR_TAB_FORWARD:
1172         case GTK_DIR_DOWN:
1173           return FOCUS_CHILD;
1174         case GTK_DIR_RIGHT:
1175           return ltr ? FOCUS_CHILD : FOCUS_WIDGET;
1176           break;
1177         }
1178     case FOCUS_CHILD:
1179       switch (direction)
1180         {
1181         case GTK_DIR_TAB_BACKWARD:
1182         case GTK_DIR_LEFT:
1183         case GTK_DIR_UP:
1184           return FOCUS_LABEL;
1185         case GTK_DIR_TAB_FORWARD:
1186         case GTK_DIR_DOWN:
1187         case GTK_DIR_RIGHT:
1188           return FOCUS_NONE;
1189         }
1190     }
1191
1192   g_assert_not_reached ();
1193   return FOCUS_NONE;
1194 }
1195
1196 static gboolean
1197 gtk_expander_focus (GtkWidget        *widget,
1198                     GtkDirectionType  direction)
1199 {
1200   GtkExpander *expander = GTK_EXPANDER (widget);
1201
1202   if (!focus_current_site (expander, direction))
1203     {
1204       GtkWidget *old_focus_child;
1205       gboolean widget_is_focus;
1206       FocusSite site = FOCUS_NONE;
1207
1208       widget_is_focus = gtk_widget_is_focus (widget);
1209       old_focus_child = gtk_container_get_focus_child (GTK_CONTAINER (widget));
1210
1211       if (old_focus_child && old_focus_child == expander->priv->label_widget)
1212         site = FOCUS_LABEL;
1213       else if (old_focus_child)
1214         site = FOCUS_CHILD;
1215       else if (widget_is_focus)
1216         site = FOCUS_WIDGET;
1217
1218       while ((site = get_next_site (expander, site, direction)) != FOCUS_NONE)
1219         {
1220           if (focus_in_site (expander, site, direction))
1221             return TRUE;
1222         }
1223
1224       return FALSE;
1225     }
1226
1227   return TRUE;
1228 }
1229
1230 static void
1231 gtk_expander_add (GtkContainer *container,
1232                   GtkWidget    *widget)
1233 {
1234   GTK_CONTAINER_CLASS (gtk_expander_parent_class)->add (container, widget);
1235
1236   gtk_widget_set_child_visible (widget, GTK_EXPANDER (container)->priv->expanded);
1237   gtk_widget_queue_resize (GTK_WIDGET (container));
1238 }
1239
1240 static void
1241 gtk_expander_remove (GtkContainer *container,
1242                      GtkWidget    *widget)
1243 {
1244   GtkExpander *expander = GTK_EXPANDER (container);
1245
1246   if (GTK_EXPANDER (expander)->priv->label_widget == widget)
1247     gtk_expander_set_label_widget (expander, NULL);
1248   else
1249     GTK_CONTAINER_CLASS (gtk_expander_parent_class)->remove (container, widget);
1250 }
1251
1252 static void
1253 gtk_expander_forall (GtkContainer *container,
1254                      gboolean      include_internals,
1255                      GtkCallback   callback,
1256                      gpointer      callback_data)
1257 {
1258   GtkBin *bin = GTK_BIN (container);
1259   GtkExpanderPrivate *priv = GTK_EXPANDER (container)->priv;
1260
1261   if (bin->child)
1262     (* callback) (bin->child, callback_data);
1263
1264   if (priv->label_widget)
1265     (* callback) (priv->label_widget, callback_data);
1266 }
1267
1268 static void
1269 gtk_expander_activate (GtkExpander *expander)
1270 {
1271   gtk_expander_set_expanded (expander, !expander->priv->expanded);
1272 }
1273
1274 /**
1275  * gtk_expander_new:
1276  * @label: the text of the label
1277  *
1278  * Creates a new expander using @label as the text of the label.
1279  *
1280  * Return value: a new #GtkExpander widget.
1281  *
1282  * Since: 2.4
1283  **/
1284 GtkWidget *
1285 gtk_expander_new (const gchar *label)
1286 {
1287   return g_object_new (GTK_TYPE_EXPANDER, "label", label, NULL);
1288 }
1289
1290 /**
1291  * gtk_expander_new_with_mnemonic:
1292  * @label: (allow-none): the text of the label with an underscore in front of the
1293  *         mnemonic character
1294  *
1295  * Creates a new expander using @label as the text of the label.
1296  * If characters in @label are preceded by an underscore, they are underlined.
1297  * If you need a literal underscore character in a label, use '__' (two
1298  * underscores). The first underlined character represents a keyboard
1299  * accelerator called a mnemonic.
1300  * Pressing Alt and that key activates the button.
1301  *
1302  * Return value: a new #GtkExpander widget.
1303  *
1304  * Since: 2.4
1305  **/
1306 GtkWidget *
1307 gtk_expander_new_with_mnemonic (const gchar *label)
1308 {
1309   return g_object_new (GTK_TYPE_EXPANDER,
1310                        "label", label,
1311                        "use-underline", TRUE,
1312                        NULL);
1313 }
1314
1315 static gboolean
1316 gtk_expander_animation_timeout (GtkExpander *expander)
1317 {
1318   GtkExpanderPrivate *priv = expander->priv;
1319   GdkRectangle area;
1320   gboolean finish = FALSE;
1321
1322   if (gtk_widget_get_realized (GTK_WIDGET (expander)))
1323     {
1324       get_expander_bounds (expander, &area);
1325       gdk_window_invalidate_rect (GTK_WIDGET (expander)->window, &area, TRUE);
1326     }
1327
1328   if (priv->expanded)
1329     {
1330       if (priv->expander_style == GTK_EXPANDER_COLLAPSED)
1331         {
1332           priv->expander_style = GTK_EXPANDER_SEMI_EXPANDED;
1333         }
1334       else
1335         {
1336           priv->expander_style = GTK_EXPANDER_EXPANDED;
1337           finish = TRUE;
1338         }
1339     }
1340   else
1341     {
1342       if (priv->expander_style == GTK_EXPANDER_EXPANDED)
1343         {
1344           priv->expander_style = GTK_EXPANDER_SEMI_COLLAPSED;
1345         }
1346       else
1347         {
1348           priv->expander_style = GTK_EXPANDER_COLLAPSED;
1349           finish = TRUE;
1350         }
1351     }
1352
1353   if (finish)
1354     {
1355       priv->animation_timeout = 0;
1356       if (GTK_BIN (expander)->child)
1357         gtk_widget_set_child_visible (GTK_BIN (expander)->child, priv->expanded);
1358       gtk_widget_queue_resize (GTK_WIDGET (expander));
1359     }
1360
1361   return !finish;
1362 }
1363
1364 static void
1365 gtk_expander_start_animation (GtkExpander *expander)
1366 {
1367   GtkExpanderPrivate *priv = expander->priv;
1368
1369   if (priv->animation_timeout)
1370     g_source_remove (priv->animation_timeout);
1371
1372   priv->animation_timeout =
1373                 gdk_threads_add_timeout (50,
1374                                (GSourceFunc) gtk_expander_animation_timeout,
1375                                expander);
1376 }
1377
1378 /**
1379  * gtk_expander_set_expanded:
1380  * @expander: a #GtkExpander
1381  * @expanded: whether the child widget is revealed
1382  *
1383  * Sets the state of the expander. Set to %TRUE, if you want
1384  * the child widget to be revealed, and %FALSE if you want the
1385  * child widget to be hidden.
1386  *
1387  * Since: 2.4
1388  **/
1389 void
1390 gtk_expander_set_expanded (GtkExpander *expander,
1391                            gboolean     expanded)
1392 {
1393   GtkExpanderPrivate *priv;
1394
1395   g_return_if_fail (GTK_IS_EXPANDER (expander));
1396
1397   priv = expander->priv;
1398
1399   expanded = expanded != FALSE;
1400
1401   if (priv->expanded != expanded)
1402     {
1403       GtkSettings *settings = gtk_widget_get_settings (GTK_WIDGET (expander));
1404       gboolean     enable_animations;
1405
1406       priv->expanded = expanded;
1407
1408       g_object_get (settings, "gtk-enable-animations", &enable_animations, NULL);
1409
1410       if (enable_animations && gtk_widget_get_realized (GTK_WIDGET (expander)))
1411         {
1412           gtk_expander_start_animation (expander);
1413         }
1414       else
1415         {
1416           priv->expander_style = expanded ? GTK_EXPANDER_EXPANDED :
1417                                             GTK_EXPANDER_COLLAPSED;
1418
1419           if (GTK_BIN (expander)->child)
1420             {
1421               gtk_widget_set_child_visible (GTK_BIN (expander)->child, priv->expanded);
1422               gtk_widget_queue_resize (GTK_WIDGET (expander));
1423             }
1424         }
1425
1426       g_object_notify (G_OBJECT (expander), "expanded");
1427     }
1428 }
1429
1430 /**
1431  * gtk_expander_get_expanded:
1432  * @expander:a #GtkExpander
1433  *
1434  * Queries a #GtkExpander and returns its current state. Returns %TRUE
1435  * if the child widget is revealed.
1436  *
1437  * See gtk_expander_set_expanded().
1438  *
1439  * Return value: the current state of the expander.
1440  *
1441  * Since: 2.4
1442  **/
1443 gboolean
1444 gtk_expander_get_expanded (GtkExpander *expander)
1445 {
1446   g_return_val_if_fail (GTK_IS_EXPANDER (expander), FALSE);
1447
1448   return expander->priv->expanded;
1449 }
1450
1451 /**
1452  * gtk_expander_set_spacing:
1453  * @expander: a #GtkExpander
1454  * @spacing: distance between the expander and child in pixels.
1455  *
1456  * Sets the spacing field of @expander, which is the number of pixels to
1457  * place between expander and the child.
1458  *
1459  * Since: 2.4
1460  **/
1461 void
1462 gtk_expander_set_spacing (GtkExpander *expander,
1463                           gint         spacing)
1464 {
1465   g_return_if_fail (GTK_IS_EXPANDER (expander));
1466   g_return_if_fail (spacing >= 0);
1467
1468   if (expander->priv->spacing != spacing)
1469     {
1470       expander->priv->spacing = spacing;
1471
1472       gtk_widget_queue_resize (GTK_WIDGET (expander));
1473
1474       g_object_notify (G_OBJECT (expander), "spacing");
1475     }
1476 }
1477
1478 /**
1479  * gtk_expander_get_spacing:
1480  * @expander: a #GtkExpander
1481  *
1482  * Gets the value set by gtk_expander_set_spacing().
1483  *
1484  * Return value: spacing between the expander and child.
1485  *
1486  * Since: 2.4
1487  **/
1488 gint
1489 gtk_expander_get_spacing (GtkExpander *expander)
1490 {
1491   g_return_val_if_fail (GTK_IS_EXPANDER (expander), 0);
1492
1493   return expander->priv->spacing;
1494 }
1495
1496 /**
1497  * gtk_expander_set_label:
1498  * @expander: a #GtkExpander
1499  * @label: (allow-none): a string
1500  *
1501  * Sets the text of the label of the expander to @label.
1502  *
1503  * This will also clear any previously set labels.
1504  *
1505  * Since: 2.4
1506  **/
1507 void
1508 gtk_expander_set_label (GtkExpander *expander,
1509                         const gchar *label)
1510 {
1511   g_return_if_fail (GTK_IS_EXPANDER (expander));
1512
1513   if (!label)
1514     {
1515       gtk_expander_set_label_widget (expander, NULL);
1516     }
1517   else
1518     {
1519       GtkWidget *child;
1520
1521       child = gtk_label_new (label);
1522       gtk_label_set_use_underline (GTK_LABEL (child), expander->priv->use_underline);
1523       gtk_label_set_use_markup (GTK_LABEL (child), expander->priv->use_markup);
1524       gtk_widget_show (child);
1525
1526       gtk_expander_set_label_widget (expander, child);
1527     }
1528
1529   g_object_notify (G_OBJECT (expander), "label");
1530 }
1531
1532 /**
1533  * gtk_expander_get_label:
1534  * @expander: a #GtkExpander
1535  *
1536  * Fetches the text from a label widget including any embedded
1537  * underlines indicating mnemonics and Pango markup, as set by
1538  * gtk_expander_set_label(). If the label text has not been set the
1539  * return value will be %NULL. This will be the case if you create an
1540  * empty button with gtk_button_new() to use as a container.
1541  *
1542  * Note that this function behaved differently in versions prior to
1543  * 2.14 and used to return the label text stripped of embedded
1544  * underlines indicating mnemonics and Pango markup. This problem can
1545  * be avoided by fetching the label text directly from the label
1546  * widget.
1547  *
1548  * Return value: The text of the label widget. This string is owned
1549  * by the widget and must not be modified or freed.
1550  *
1551  * Since: 2.4
1552  **/
1553 G_CONST_RETURN char *
1554 gtk_expander_get_label (GtkExpander *expander)
1555 {
1556   GtkExpanderPrivate *priv;
1557
1558   g_return_val_if_fail (GTK_IS_EXPANDER (expander), NULL);
1559
1560   priv = expander->priv;
1561
1562   if (GTK_IS_LABEL (priv->label_widget))
1563     return gtk_label_get_label (GTK_LABEL (priv->label_widget));
1564   else
1565     return NULL;
1566 }
1567
1568 /**
1569  * gtk_expander_set_use_underline:
1570  * @expander: a #GtkExpander
1571  * @use_underline: %TRUE if underlines in the text indicate mnemonics
1572  *
1573  * If true, an underline in the text of the expander label indicates
1574  * the next character should be used for the mnemonic accelerator key.
1575  *
1576  * Since: 2.4
1577  **/
1578 void
1579 gtk_expander_set_use_underline (GtkExpander *expander,
1580                                 gboolean     use_underline)
1581 {
1582   GtkExpanderPrivate *priv;
1583
1584   g_return_if_fail (GTK_IS_EXPANDER (expander));
1585
1586   priv = expander->priv;
1587
1588   use_underline = use_underline != FALSE;
1589
1590   if (priv->use_underline != use_underline)
1591     {
1592       priv->use_underline = use_underline;
1593
1594       if (GTK_IS_LABEL (priv->label_widget))
1595         gtk_label_set_use_underline (GTK_LABEL (priv->label_widget), use_underline);
1596
1597       g_object_notify (G_OBJECT (expander), "use-underline");
1598     }
1599 }
1600
1601 /**
1602  * gtk_expander_get_use_underline:
1603  * @expander: a #GtkExpander
1604  *
1605  * Returns whether an embedded underline in the expander label indicates a
1606  * mnemonic. See gtk_expander_set_use_underline().
1607  *
1608  * Return value: %TRUE if an embedded underline in the expander label
1609  *               indicates the mnemonic accelerator keys.
1610  *
1611  * Since: 2.4
1612  **/
1613 gboolean
1614 gtk_expander_get_use_underline (GtkExpander *expander)
1615 {
1616   g_return_val_if_fail (GTK_IS_EXPANDER (expander), FALSE);
1617
1618   return expander->priv->use_underline;
1619 }
1620
1621 /**
1622  * gtk_expander_set_use_markup:
1623  * @expander: a #GtkExpander
1624  * @use_markup: %TRUE if the label's text should be parsed for markup
1625  *
1626  * Sets whether the text of the label contains markup in <link
1627  * linkend="PangoMarkupFormat">Pango's text markup
1628  * language</link>. See gtk_label_set_markup().
1629  *
1630  * Since: 2.4
1631  **/
1632 void
1633 gtk_expander_set_use_markup (GtkExpander *expander,
1634                              gboolean     use_markup)
1635 {
1636   GtkExpanderPrivate *priv;
1637
1638   g_return_if_fail (GTK_IS_EXPANDER (expander));
1639
1640   priv = expander->priv;
1641
1642   use_markup = use_markup != FALSE;
1643
1644   if (priv->use_markup != use_markup)
1645     {
1646       priv->use_markup = use_markup;
1647
1648       if (GTK_IS_LABEL (priv->label_widget))
1649         gtk_label_set_use_markup (GTK_LABEL (priv->label_widget), use_markup);
1650
1651       g_object_notify (G_OBJECT (expander), "use-markup");
1652     }
1653 }
1654
1655 /**
1656  * gtk_expander_get_use_markup:
1657  * @expander: a #GtkExpander
1658  *
1659  * Returns whether the label's text is interpreted as marked up with
1660  * the <link linkend="PangoMarkupFormat">Pango text markup
1661  * language</link>. See gtk_expander_set_use_markup ().
1662  *
1663  * Return value: %TRUE if the label's text will be parsed for markup
1664  *
1665  * Since: 2.4
1666  **/
1667 gboolean
1668 gtk_expander_get_use_markup (GtkExpander *expander)
1669 {
1670   g_return_val_if_fail (GTK_IS_EXPANDER (expander), FALSE);
1671
1672   return expander->priv->use_markup;
1673 }
1674
1675 /**
1676  * gtk_expander_set_label_widget:
1677  * @expander: a #GtkExpander
1678  * @label_widget: (allow-none): the new label widget
1679  *
1680  * Set the label widget for the expander. This is the widget
1681  * that will appear embedded alongside the expander arrow.
1682  *
1683  * Since: 2.4
1684  **/
1685 void
1686 gtk_expander_set_label_widget (GtkExpander *expander,
1687                                GtkWidget   *label_widget)
1688 {
1689   GtkExpanderPrivate *priv;
1690   GtkWidget          *widget;
1691
1692   g_return_if_fail (GTK_IS_EXPANDER (expander));
1693   g_return_if_fail (label_widget == NULL || GTK_IS_WIDGET (label_widget));
1694   g_return_if_fail (label_widget == NULL || label_widget->parent == NULL);
1695
1696   priv = expander->priv;
1697
1698   if (priv->label_widget == label_widget)
1699     return;
1700
1701   if (priv->label_widget)
1702     {
1703       gtk_widget_set_state (priv->label_widget, GTK_STATE_NORMAL);
1704       gtk_widget_unparent (priv->label_widget);
1705     }
1706
1707   priv->label_widget = label_widget;
1708   widget = GTK_WIDGET (expander);
1709
1710   if (label_widget)
1711     {
1712       priv->label_widget = label_widget;
1713
1714       gtk_widget_set_parent (label_widget, widget);
1715
1716       if (priv->prelight)
1717         gtk_widget_set_state (label_widget, GTK_STATE_PRELIGHT);
1718     }
1719
1720   if (gtk_widget_get_visible (widget))
1721     gtk_widget_queue_resize (widget);
1722
1723   g_object_freeze_notify (G_OBJECT (expander));
1724   g_object_notify (G_OBJECT (expander), "label-widget");
1725   g_object_notify (G_OBJECT (expander), "label");
1726   g_object_thaw_notify (G_OBJECT (expander));
1727 }
1728
1729 /**
1730  * gtk_expander_get_label_widget:
1731  * @expander: a #GtkExpander
1732  *
1733  * Retrieves the label widget for the frame. See
1734  * gtk_expander_set_label_widget().
1735  *
1736  * Return value: the label widget, or %NULL if there is none.
1737  *
1738  * Since: 2.4
1739  **/
1740 GtkWidget *
1741 gtk_expander_get_label_widget (GtkExpander *expander)
1742 {
1743   g_return_val_if_fail (GTK_IS_EXPANDER (expander), NULL);
1744
1745   return expander->priv->label_widget;
1746 }