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

   1 /* GTK - The GIMP Toolkit
   2  * gtklinkbutton.c - an hyperlink-enabled button
   3  *
   4  * Copyright (C) 2006 Emmanuele Bassi <ebassi@gmail.com>
   5  * All rights reserved.
   6  *
   7  * Based on gnome-href code by:
   8  *      James Henstridge <james@daa.com.au>
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Library General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Library General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Library General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Cambridge, MA 02139, USA.
  23  */
  24
  25 #include "config.h"
  26
  27 #include <string.h>
  28
  29 #include "gtkclipboard.h"
  30 #include "gtkdnd.h"
  31 #include "gtkimagemenuitem.h"
  32 #include "gtklabel.h"
  33 #include "gtkmain.h"
  34 #include "gtkmenu.h"
  35 #include "gtkmenuitem.h"
  36 #include "gtkstock.h"
  37 #include "gtktooltip.h"
  38
  39 #include "gtklinkbutton.h"
  40
  41 #include "gtkintl.h"
  42 #include "gtkalias.h"
  43
  44
  45 struct _GtkLinkButtonPrivate
  46 {
  47   gchar *uri;
  48
  49   gboolean visited;
  50
  51   GtkWidget *popup_menu;
  52 };
  53
  54 enum
  55 {
  56   PROP_0,
  57   PROP_URI,
  58   PROP_VISITED
  59 };
  60
  61 #define GTK_LINK_BUTTON_GET_PRIVATE(obj)        (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GTK_TYPE_LINK_BUTTON, GtkLinkButtonPrivate))
  62
  63 static void     gtk_link_button_finalize     (GObject          *object);
  64 static void     gtk_link_button_get_property (GObject          *object,
  65                                               guint             prop_id,
  66                                               GValue           *value,
  67                                               GParamSpec       *pspec);
  68 static void     gtk_link_button_set_property (GObject          *object,
  69                                               guint             prop_id,
  70                                               const GValue     *value,
  71                                               GParamSpec       *pspec);
  72 static void     gtk_link_button_add          (GtkContainer     *container,
  73                                               GtkWidget        *widget);
  74 static gboolean gtk_link_button_button_press (GtkWidget        *widget,
  75                                               GdkEventButton   *event);
  76 static void     gtk_link_button_clicked      (GtkButton        *button);
  77 static gboolean gtk_link_button_popup_menu   (GtkWidget        *widget);
  78 static void     gtk_link_button_style_set    (GtkWidget        *widget,
  79                                               GtkStyle         *old_style);
  80 static gboolean gtk_link_button_enter_cb     (GtkWidget        *widget,
  81                                               GdkEventCrossing *event,
  82                                               gpointer          user_data);
  83 static gboolean gtk_link_button_leave_cb     (GtkWidget        *widget,
  84                                               GdkEventCrossing *event,
  85                                               gpointer          user_data);
  86 static void gtk_link_button_drag_data_get_cb (GtkWidget        *widget,
  87                                               GdkDragContext   *context,
  88                                               GtkSelectionData *selection,
  89                                               guint             _info,
  90                                               guint             _time,
  91                                               gpointer          user_data);
  92 static gboolean gtk_link_button_query_tooltip_cb (GtkWidget    *widget,
  93                                                   gint          x,
  94                                                   gint          y,
  95                                                   gboolean      keyboard_tip,
  96                                                   GtkTooltip   *tooltip,
  97                                                   gpointer      data);
  98
  99
 100 static const GtkTargetEntry link_drop_types[] = {
 101   { "text/uri-list", 0, 0 },
 102   { "_NETSCAPE_URL", 0, 0 }
 103 };
 104
 105 static const GdkColor default_link_color = { 0, 0, 0, 0xeeee };
 106 static const GdkColor default_visited_link_color = { 0, 0x5555, 0x1a1a, 0x8b8b };
 107
 108 static GtkLinkButtonUriFunc uri_func = NULL;
 109 static gpointer uri_func_data = NULL;
 110 static GDestroyNotify uri_func_destroy = NULL;
 111
 112 G_DEFINE_TYPE (GtkLinkButton, gtk_link_button, GTK_TYPE_BUTTON)
 113
 114 static void
 115 gtk_link_button_class_init (GtkLinkButtonClass *klass)
 116 {
 117   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 118   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
 119   GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
 120   GtkButtonClass *button_class = GTK_BUTTON_CLASS (klass);
 121
 122   gobject_class->set_property = gtk_link_button_set_property;
 123   gobject_class->get_property = gtk_link_button_get_property;
 124   gobject_class->finalize = gtk_link_button_finalize;
 125
 126   widget_class->button_press_event = gtk_link_button_button_press;
 127   widget_class->popup_menu = gtk_link_button_popup_menu;
 128   widget_class->style_set = gtk_link_button_style_set;
 129
 130   container_class->add = gtk_link_button_add;
 131
 132   button_class->clicked = gtk_link_button_clicked;
 133
 134   /**
 135    * GtkLinkButton:uri
 136    *
 137    * The URI bound to this button.
 138    *
 139    * Since: 2.10
 140    */
 141   g_object_class_install_property (gobject_class,
 142                                    PROP_URI,
 143                                    g_param_spec_string ("uri",
 144                                                         P_("URI"),
 145                                                         P_("The URI bound to this button"),
 146                                                         NULL,
 147                                                         G_PARAM_READWRITE));
 148   /**
 149    * GtkLinkButton:visited
 150    *
 151    * The 'visited' state of this button. A visited link is drawn in a
 152    * different color.
 153    *
 154    * Since: 2.14
 155    */
 156   g_object_class_install_property (gobject_class,
 157                                    PROP_VISITED,
 158                                    g_param_spec_boolean ("visited",
 159                                                          P_("Visited"),
 160                                                          P_("Whether this link has been visited."),
 161                                                          FALSE,
 162                                                          G_PARAM_READWRITE));
 163
 164   g_type_class_add_private (gobject_class, sizeof (GtkLinkButtonPrivate));
 165 }
 166
 167 static void
 168 gtk_link_button_init (GtkLinkButton *link_button)
 169 {
 170   link_button->priv = GTK_LINK_BUTTON_GET_PRIVATE (link_button),
 171
 172   gtk_button_set_relief (GTK_BUTTON (link_button), GTK_RELIEF_NONE);
 173
 174   g_signal_connect (link_button, "enter-notify-event",
 175                     G_CALLBACK (gtk_link_button_enter_cb), NULL);
 176   g_signal_connect (link_button, "leave-notify-event",
 177                     G_CALLBACK (gtk_link_button_leave_cb), NULL);
 178   g_signal_connect (link_button, "drag-data-get",
 179                     G_CALLBACK (gtk_link_button_drag_data_get_cb), NULL);
 180
 181   g_object_set (link_button, "has-tooltip", TRUE, NULL);
 182   g_signal_connect (link_button, "query-tooltip",
 183                     G_CALLBACK (gtk_link_button_query_tooltip_cb), NULL);
 184
 185   /* enable drag source */
 186   gtk_drag_source_set (GTK_WIDGET (link_button),
 187                        GDK_BUTTON1_MASK,
 188                        link_drop_types, G_N_ELEMENTS (link_drop_types),
 189                        GDK_ACTION_COPY);
 190 }
 191
 192 static void
 193 gtk_link_button_finalize (GObject *object)
 194 {
 195   GtkLinkButton *link_button = GTK_LINK_BUTTON (object);
 196
 197   g_free (link_button->priv->uri);
 198
 199   G_OBJECT_CLASS (gtk_link_button_parent_class)->finalize (object);
 200 }
 201
 202 static void
 203 gtk_link_button_get_property (GObject    *object,
 204                               guint       prop_id,
 205                               GValue     *value,
 206                               GParamSpec *pspec)
 207 {
 208   GtkLinkButton *link_button = GTK_LINK_BUTTON (object);
 209
 210   switch (prop_id)
 211     {
 212     case PROP_URI:
 213       g_value_set_string (value, link_button->priv->uri);
 214       break;
 215     case PROP_VISITED:
 216       g_value_set_boolean (value, link_button->priv->visited);
 217       break;
 218     default:
 219       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 220       break;
 221     }
 222 }
 223
 224 static void
 225 gtk_link_button_set_property (GObject      *object,
 226                               guint         prop_id,
 227                               const GValue *value,
 228                               GParamSpec   *pspec)
 229 {
 230   GtkLinkButton *link_button = GTK_LINK_BUTTON (object);
 231
 232   switch (prop_id)
 233     {
 234     case PROP_URI:
 235       gtk_link_button_set_uri (link_button, g_value_get_string (value));
 236       break;
 237     case PROP_VISITED:
 238       gtk_link_button_set_visited (link_button, g_value_get_boolean (value));
 239       break;
 240     default:
 241       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 242       break;
 243     }
 244 }
 245
 246 static void
 247 set_link_color (GtkLinkButton *link_button)
 248 {
 249   GdkColor *link_color = NULL;
 250   GtkWidget *label;
 251
 252   label = gtk_bin_get_child (GTK_BIN (link_button));
 253
 254   if (link_button->priv->visited)
 255     {
 256       gtk_widget_style_get (GTK_WIDGET (link_button),
 257                             "visited-link-color", &link_color, NULL);
 258       if (!link_color)
 259         link_color = (GdkColor *) &default_visited_link_color;
 260     }
 261   else
 262     {
 263       gtk_widget_style_get (GTK_WIDGET (link_button),
 264                             "link-color", &link_color, NULL);
 265       if (!link_color)
 266         link_color = (GdkColor *) &default_link_color;
 267     }
 268
 269   gtk_widget_modify_fg (label, GTK_STATE_NORMAL, link_color);
 270   gtk_widget_modify_fg (label, GTK_STATE_ACTIVE, link_color);
 271   gtk_widget_modify_fg (label, GTK_STATE_PRELIGHT, link_color);
 272   gtk_widget_modify_fg (label, GTK_STATE_SELECTED, link_color);
 273
 274   if (link_color != &default_link_color &&
 275       link_color != &default_visited_link_color)
 276     gdk_color_free (link_color);
 277 }
 278
 279 static void
 280 set_link_underline (GtkLinkButton *link_button)
 281 {
 282   GtkWidget *label;
 283
 284   label = gtk_bin_get_child (GTK_BIN (link_button));
 285   if (GTK_IS_LABEL (label))
 286     {
 287       PangoAttrList *attributes;
 288       PangoAttribute *uline;
 289
 290       uline = pango_attr_underline_new (PANGO_UNDERLINE_SINGLE);
 291       uline->start_index = 0;
 292       uline->end_index = G_MAXUINT;
 293       attributes = pango_attr_list_new ();
 294       pango_attr_list_insert (attributes, uline);
 295       gtk_label_set_attributes (GTK_LABEL (label), attributes);
 296       pango_attr_list_unref (attributes);
 297     }
 298 }
 299
 300 static void
 301 gtk_link_button_add (GtkContainer *container,
 302                      GtkWidget    *widget)
 303 {
 304   GTK_CONTAINER_CLASS (gtk_link_button_parent_class)->add (container, widget);
 305
 306   set_link_underline (GTK_LINK_BUTTON (container));
 307 }
 308
 309 static void
 310 gtk_link_button_style_set (GtkWidget *widget,
 311                            GtkStyle  *old_style)
 312 {
 313   GtkLinkButton *link_button = GTK_LINK_BUTTON (widget);
 314
 315   set_link_color (link_button);
 316 }
 317
 318 static void
 319 set_hand_cursor (GtkWidget *widget,
 320                  gboolean   show_hand)
 321 {
 322   GdkDisplay *display;
 323   GdkCursor *cursor;
 324
 325   display = gtk_widget_get_display (widget);
 326
 327   cursor = NULL;
 328   if (show_hand)
 329     cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
 330
 331   gdk_window_set_cursor (widget->window, cursor);
 332   gdk_display_flush (display);
 333
 334   if (cursor)
 335     gdk_cursor_unref (cursor);
 336 }
 337
 338 static void
 339 popup_menu_detach (GtkWidget *attach_widget,
 340                    GtkMenu   *menu)
 341 {
 342   GtkLinkButton *link_button = GTK_LINK_BUTTON (attach_widget);
 343
 344   link_button->priv->popup_menu = NULL;
 345 }
 346
 347 static void
 348 popup_position_func (GtkMenu  *menu,
 349                      gint     *x,
 350                      gint     *y,
 351                      gboolean *push_in,
 352                      gpointer  user_data)
 353 {
 354   GtkLinkButton *link_button = GTK_LINK_BUTTON (user_data);
 355   GtkLinkButtonPrivate *priv = link_button->priv;
 356   GtkWidget *widget = GTK_WIDGET (link_button);
 357   GdkScreen *screen = gtk_widget_get_screen (widget);
 358   GtkRequisition req;
 359   gint monitor_num;
 360   GdkRectangle monitor;
 361
 362   g_return_if_fail (GTK_WIDGET_REALIZED (link_button));
 363
 364   gdk_window_get_origin (widget->window, x, y);
 365
 366   gtk_widget_size_request (priv->popup_menu, &req);
 367
 368   *x += widget->allocation.width / 2;
 369   *y += widget->allocation.height;
 370
 371   monitor_num = gdk_screen_get_monitor_at_point (screen, *x, *y);
 372   gtk_menu_set_monitor (menu, monitor_num);
 373   gdk_screen_get_monitor_geometry (screen, monitor_num, &monitor);
 374
 375   *x = CLAMP (*x, monitor.x, monitor.x + MAX (0, monitor.width - req.width));
 376   *y = CLAMP (*y, monitor.y, monitor.y + MAX (0, monitor.height - req.height));
 377
 378   *push_in = FALSE;
 379 }
 380
 381 static void
 382 copy_activate_cb (GtkWidget     *widget,
 383                   GtkLinkButton *link_button)
 384 {
 385   GtkLinkButtonPrivate *priv = link_button->priv;
 386
 387   gtk_clipboard_set_text (gtk_widget_get_clipboard (GTK_WIDGET (link_button),
 388                                                     GDK_SELECTION_CLIPBOARD),
 389                           priv->uri, -1);
 390 }
 391
 392 static void
 393 gtk_link_button_do_popup (GtkLinkButton  *link_button,
 394                           GdkEventButton *event)
 395 {
 396   GtkLinkButtonPrivate *priv = link_button->priv;
 397   gint button;
 398   guint time;
 399
 400   if (event)
 401     {
 402       button = event->button;
 403       time = event->time;
 404     }
 405   else
 406     {
 407       button = 0;
 408       time = gtk_get_current_event_time ();
 409     }
 410
 411   if (GTK_WIDGET_REALIZED (link_button))
 412     {
 413       GtkWidget *menu_item;
 414
 415       if (priv->popup_menu)
 416         gtk_widget_destroy (priv->popup_menu);
 417
 418       priv->popup_menu = gtk_menu_new ();
 419
 420       gtk_menu_attach_to_widget (GTK_MENU (priv->popup_menu),
 421                                  GTK_WIDGET (link_button),
 422                                  popup_menu_detach);
 423
 424       menu_item = gtk_image_menu_item_new_with_mnemonic (_("Copy URL"));
 425       gtk_image_menu_item_set_image (GTK_IMAGE_MENU_ITEM (menu_item),
 426                                      gtk_image_new_from_stock (GTK_STOCK_COPY,
 427                                                                GTK_ICON_SIZE_MENU));
 428       g_signal_connect (menu_item, "activate",
 429                         G_CALLBACK (copy_activate_cb), link_button);
 430       gtk_widget_show (menu_item);
 431       gtk_menu_shell_append (GTK_MENU_SHELL (priv->popup_menu), menu_item);
 432
 433       if (button)
 434         gtk_menu_popup (GTK_MENU (priv->popup_menu), NULL, NULL,
 435                         NULL, NULL,
 436                         button, time);
 437       else
 438         {
 439           gtk_menu_popup (GTK_MENU (priv->popup_menu), NULL, NULL,
 440                           popup_position_func, link_button,
 441                           button, time);
 442           gtk_menu_shell_select_first (GTK_MENU_SHELL (priv->popup_menu), FALSE);
 443         }
 444     }
 445 }
 446
 447 static gboolean
 448 gtk_link_button_button_press (GtkWidget      *widget,
 449                               GdkEventButton *event)
 450 {
 451   if (!GTK_WIDGET_HAS_FOCUS (widget))
 452     gtk_widget_grab_focus (widget);
 453
 454   if ((event->button == 3) && (event->type == GDK_BUTTON_PRESS))
 455     {
 456       gtk_link_button_do_popup (GTK_LINK_BUTTON (widget), event);
 457
 458       return TRUE;
 459     }
 460
 461   if (GTK_WIDGET_CLASS (gtk_link_button_parent_class)->button_press_event)
 462     return (* GTK_WIDGET_CLASS (gtk_link_button_parent_class)->button_press_event) (widget, event);
 463
 464   return FALSE;
 465 }
 466
 467 static void
 468 gtk_link_button_clicked (GtkButton *button)
 469 {
 470   GtkLinkButton *link_button = GTK_LINK_BUTTON (button);
 471
 472   if (uri_func)
 473     (* uri_func) (link_button, link_button->priv->uri, uri_func_data);
 474
 475   gtk_link_button_set_visited (link_button, TRUE);
 476 }
 477
 478 static gboolean
 479 gtk_link_button_popup_menu (GtkWidget *widget)
 480 {
 481   gtk_link_button_do_popup (GTK_LINK_BUTTON (widget), NULL);
 482
 483   return TRUE;
 484 }
 485
 486 static gboolean
 487 gtk_link_button_enter_cb (GtkWidget        *widget,
 488                           GdkEventCrossing *crossing,
 489                           gpointer          user_data)
 490 {
 491   set_hand_cursor (widget, TRUE);
 492
 493   return FALSE;
 494 }
 495
 496 static gboolean
 497 gtk_link_button_leave_cb (GtkWidget        *widget,
 498                           GdkEventCrossing *crossing,
 499                           gpointer          user_data)
 500 {
 501   set_hand_cursor (widget, FALSE);
 502
 503   return FALSE;
 504 }
 505
 506 static void
 507 gtk_link_button_drag_data_get_cb (GtkWidget        *widget,
 508                                   GdkDragContext   *context,
 509                                   GtkSelectionData *selection,
 510                                   guint             _info,
 511                                   guint             _time,
 512                                   gpointer          user_data)
 513 {
 514   GtkLinkButton *link_button = GTK_LINK_BUTTON (widget);
 515   gchar *uri;
 516
 517   uri = g_strdup_printf ("%s\r\n", link_button->priv->uri);
 518   gtk_selection_data_set (selection,
 519                           selection->target,
 520                           8,
 521                           (guchar *) uri,
 522                           strlen (uri));
 523
 524   g_free (uri);
 525 }
 526
 527 /**
 528  * gtk_link_button_new:
 529  * @uri: a valid URI
 530  *
 531  * Creates a new #GtkLinkButton with the URI as its text.
 532  *
 533  * Return value: a new link button widget.
 534  *
 535  * Since: 2.10
 536  */
 537 GtkWidget *
 538 gtk_link_button_new (const gchar *uri)
 539 {
 540   gchar *utf8_uri = NULL;
 541   GtkWidget *retval;
 542
 543   g_return_val_if_fail (uri != NULL, NULL);
 544
 545   if (g_utf8_validate (uri, -1, NULL))
 546     {
 547       utf8_uri = g_strdup (uri);
 548     }
 549   else
 550     {
 551       GError *conv_err = NULL;
 552
 553       utf8_uri = g_locale_to_utf8 (uri, -1, NULL, NULL, &conv_err);
 554       if (conv_err)
 555         {
 556           g_warning ("Attempting to convert URI `%s' to UTF-8, but failed "
 557                      "with error: %s\n",
 558                      uri,
 559                      conv_err->message);
 560           g_error_free (conv_err);
 561
 562           utf8_uri = g_strdup (_("Invalid URI"));
 563         }
 564     }
 565
 566   retval = g_object_new (GTK_TYPE_LINK_BUTTON,
 567                          "label", utf8_uri,
 568                          "uri", uri,
 569                          NULL);
 570
 571   g_free (utf8_uri);
 572
 573   return retval;
 574 }
 575
 576 /**
 577  * gtk_link_button_new_with_label:
 578  * @uri: a valid URI
 579  * @label: the text of the button
 580  *
 581  * Creates a new #GtkLinkButton containing a label.
 582  *
 583  * Return value: a new link button widget.
 584  *
 585  * Since: 2.10
 586  */
 587 GtkWidget *
 588 gtk_link_button_new_with_label (const gchar *uri,
 589                                 const gchar *label)
 590 {
 591   GtkWidget *retval;
 592
 593   g_return_val_if_fail (uri != NULL, NULL);
 594
 595   if (!label)
 596     return gtk_link_button_new (uri);
 597
 598   retval = g_object_new (GTK_TYPE_LINK_BUTTON,
 599                          "label", label,
 600                          "uri", uri,
 601                          NULL);
 602
 603   return retval;
 604 }
 605
 606 static gboolean
 607 gtk_link_button_query_tooltip_cb (GtkWidget    *widget,
 608                                   gint          x,
 609                                   gint          y,
 610                                   gboolean      keyboard_tip,
 611                                   GtkTooltip   *tooltip,
 612                                   gpointer      data)
 613 {
 614   GtkLinkButton *link_button = GTK_LINK_BUTTON (widget);
 615   const gchar *label, *uri;
 616
 617   label = gtk_button_get_label (GTK_BUTTON (link_button));
 618   uri = link_button->priv->uri;
 619
 620   if (label && *label != '\0' && uri && strcmp (label, uri) != 0)
 621     {
 622       gtk_tooltip_set_text (tooltip, uri);
 623       return TRUE;
 624     }
 625
 626   return FALSE;
 627 }
 628
 629
 630 /**
 631  * gtk_link_button_set_uri:
 632  * @link_button: a #GtkLinkButton
 633  * @uri: a valid URI
 634  *
 635  * Sets @uri as the URI where the #GtkLinkButton points. As a side-effect
 636  * this unsets the 'visited' state of the button.
 637  *
 638  * Since: 2.10
 639  */
 640 void
 641 gtk_link_button_set_uri (GtkLinkButton *link_button,
 642                          const gchar   *uri)
 643 {
 644   GtkLinkButtonPrivate *priv;
 645
 646   g_return_if_fail (GTK_IS_LINK_BUTTON (link_button));
 647   g_return_if_fail (uri != NULL);
 648
 649   priv = link_button->priv;
 650
 651   g_free (priv->uri);
 652   priv->uri = g_strdup (uri);
 653
 654   g_object_notify (G_OBJECT (link_button), "uri");
 655
 656   gtk_link_button_set_visited (link_button, FALSE);
 657 }
 658
 659 /**
 660  * gtk_link_button_get_uri:
 661  * @link_button: a #GtkLinkButton
 662  *
 663  * Retrieves the URI set using gtk_link_button_set_uri().
 664  *
 665  * Return value: a valid URI.  The returned string is owned by the link button
 666  *   and should not be modified or freed.
 667  *
 668  * Since: 2.10
 669  */
 670 G_CONST_RETURN gchar *
 671 gtk_link_button_get_uri (GtkLinkButton *link_button)
 672 {
 673   g_return_val_if_fail (GTK_IS_LINK_BUTTON (link_button), NULL);
 674
 675   return link_button->priv->uri;
 676 }
 677
 678 /**
 679  * gtk_link_button_set_uri_hook:
 680  * @func: a function called each time a #GtkLinkButton is clicked, or %NULL
 681  * @data: user data to be passed to @func, or %NULL
 682  * @destroy: a #GDestroyNotify that gets called when @data is no longer needed, or %NULL
 683  *
 684  * Sets @func as the function that should be invoked every time a user clicks
 685  * a #GtkLinkButton. This function is called before every callback registered
 686  * for the "clicked" signal.
 687  *
 688  * Return value: the previously set hook function.
 689  *
 690  * Since: 2.10
 691  */
 692 GtkLinkButtonUriFunc
 693 gtk_link_button_set_uri_hook (GtkLinkButtonUriFunc func,
 694                               gpointer             data,
 695                               GDestroyNotify       destroy)
 696 {
 697   GtkLinkButtonUriFunc old_uri_func;
 698
 699   if (uri_func_destroy)
 700     (* uri_func_destroy) (uri_func_data);
 701
 702   old_uri_func = uri_func;
 703
 704   uri_func = func;
 705   uri_func_data = data;
 706   uri_func_destroy = destroy;
 707
 708   return old_uri_func;
 709 }
 710
 711 /**
 712  * gtk_link_button_set_visited:
 713  * @link_button: a #GtkLinkButton
 714  * @visited: the new 'visited' state
 715  *
 716  * Sets the 'visited' state of the URI where the #GtkLinkButton
 717  * points.  See gtk_link_button_get_visited() for more details.
 718  *
 719  * Since: 2.14
 720  */
 721 void
 722 gtk_link_button_set_visited (GtkLinkButton *link_button,
 723                              gboolean       visited)
 724 {
 725   g_return_if_fail (GTK_IS_LINK_BUTTON (link_button));
 726
 727   visited = visited != FALSE;
 728
 729   if (link_button->priv->visited != visited)
 730     {
 731       link_button->priv->visited = visited;
 732
 733       set_link_color (link_button);
 734
 735       g_object_notify (G_OBJECT (link_button), "visited");
 736     }
 737 }
 738
 739 /**
 740  * gtk_link_button_get_visited:
 741  * @link_button: a #GtkLinkButton
 742  *
 743  * Retrieves the 'visited' state of the URI where the #GtkLinkButton
 744  * points. The button becomes visited when it is clicked. If the URI
 745  * is changed on the button, the 'visited' state is unset again.
 746  *
 747  * The state may also be changed using gtk_link_button_set_visited().
 748  *
 749  * Return value: %TRUE if the link has been visited, %FALSE otherwise
 750  *
 751  * Since: 2.14
 752  */
 753 gboolean
 754 gtk_link_button_get_visited (GtkLinkButton *link_button)
 755 {
 756   g_return_val_if_fail (GTK_IS_LINK_BUTTON (link_button), FALSE);
 757
 758   return link_button->priv->visited;
 759 }
 760
 761
 762 #define __GTK_LINK_BUTTON_C__
 763 #include "gtkaliasdef.c"