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 <gdk/gdkcolor.h>
  30 #include <gdk/gdkcursor.h>
  31 #include <gdk/gdkdisplay.h>
  32
  33 #include "gtkclipboard.h"
  34 #include "gtkdnd.h"
  35 #include "gtkimagemenuitem.h"
  36 #include "gtklabel.h"
  37 #include "gtkmain.h"
  38 #include "gtkmenu.h"
  39 #include "gtkmenuitem.h"
  40 #include "gtkstock.h"
  41
  42 #include "gtklinkbutton.h"
  43
  44 #include "gtkintl.h"
  45 #include "gtkalias.h"
  46
  47
  48 struct _GtkLinkButtonPrivate
  49 {
  50   gchar *uri;
  51
  52   gboolean visited;
  53
  54   GtkWidget *popup_menu;
  55 };
  56
  57 enum
  58 {
  59   PROP_0,
  60
  61   PROP_URI,
  62 };
  63
  64 #define GTK_LINK_BUTTON_GET_PRIVATE(obj)        (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GTK_TYPE_LINK_BUTTON, GtkLinkButtonPrivate))
  65
  66 static void     gtk_link_button_finalize     (GObject          *object);
  67 static void     gtk_link_button_get_property (GObject          *object,
  68                                               guint             prop_id,
  69                                               GValue           *value,
  70                                               GParamSpec       *pspec);
  71 static void     gtk_link_button_set_property (GObject          *object,
  72                                               guint             prop_id,
  73                                               const GValue     *value,
  74                                               GParamSpec       *pspec);
  75 static void     gtk_link_button_add          (GtkContainer     *container,
  76                                               GtkWidget        *widget);
  77 static gboolean gtk_link_button_button_press (GtkWidget        *widget,
  78                                               GdkEventButton   *event);
  79 static void     gtk_link_button_clicked      (GtkButton        *button);
  80 static gboolean gtk_link_button_popup_menu   (GtkWidget        *widget);
  81 static void     gtk_link_button_style_set    (GtkWidget        *widget,
  82                                               GtkStyle         *old_style);
  83 static gboolean gtk_link_button_enter_cb     (GtkWidget        *widget,
  84                                               GdkEventCrossing *event,
  85                                               gpointer          user_data);
  86 static gboolean gtk_link_button_leave_cb     (GtkWidget        *widget,
  87                                               GdkEventCrossing *event,
  88                                               gpointer          user_data);
  89 static void gtk_link_button_drag_data_get_cb (GtkWidget        *widget,
  90                                               GdkDragContext   *context,
  91                                               GtkSelectionData *selection,
  92                                               guint             _info,
  93                                               guint             _time,
  94                                               gpointer          user_data);
  95
  96
  97 static const GtkTargetEntry link_drop_types[] = {
  98   { "text/uri-list", 0, 0 },
  99   { "_NETSCAPE_URL", 0, 0 }
 100 };
 101
 102 static const GdkColor default_link_color = { 0, 0, 0, 0xeeee };
 103 static const GdkColor default_visited_link_color = { 0, 0x5555, 0x1a1a, 0x8b8b };
 104
 105 static GtkLinkButtonUriFunc uri_func = NULL;
 106 static gpointer uri_func_data = NULL;
 107 static GDestroyNotify uri_func_destroy = NULL;
 108
 109 G_DEFINE_TYPE (GtkLinkButton, gtk_link_button, GTK_TYPE_BUTTON)
 110
 111 static void
 112 gtk_link_button_class_init (GtkLinkButtonClass *klass)
 113 {
 114   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 115   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
 116   GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
 117   GtkButtonClass *button_class = GTK_BUTTON_CLASS (klass);
 118
 119   gobject_class->set_property = gtk_link_button_set_property;
 120   gobject_class->get_property = gtk_link_button_get_property;
 121   gobject_class->finalize = gtk_link_button_finalize;
 122
 123   widget_class->button_press_event = gtk_link_button_button_press;
 124   widget_class->popup_menu = gtk_link_button_popup_menu;
 125   widget_class->style_set = gtk_link_button_style_set;
 126
 127   container_class->add = gtk_link_button_add;
 128
 129   button_class->clicked = gtk_link_button_clicked;
 130
 131   /**
 132    * GtkLinkButton:uri
 133    *
 134    * The URI bound to this button.
 135    *
 136    * Since: 2.10
 137    */
 138   g_object_class_install_property (gobject_class,
 139                                    PROP_URI,
 140                                    g_param_spec_string ("uri",
 141                                                         _("URI"),
 142                                                         _("The URI bound to this button"),
 143                                                         "http://www.gtk.org",
 144                                                         G_PARAM_READWRITE));
 145
 146   g_type_class_add_private (gobject_class, sizeof (GtkLinkButtonPrivate));
 147 }
 148
 149 static void
 150 gtk_link_button_init (GtkLinkButton *link_button)
 151 {
 152   link_button->priv = GTK_LINK_BUTTON_GET_PRIVATE (link_button),
 153
 154   gtk_button_set_relief (GTK_BUTTON (link_button), GTK_RELIEF_NONE);
 155
 156   g_signal_connect (link_button, "enter-notify-event",
 157                     G_CALLBACK (gtk_link_button_enter_cb), NULL);
 158   g_signal_connect (link_button, "leave-notify-event",
 159                     G_CALLBACK (gtk_link_button_leave_cb), NULL);
 160   g_signal_connect (link_button, "drag-data-get",
 161                     G_CALLBACK (gtk_link_button_drag_data_get_cb), NULL);
 162
 163   /* enable drag source */
 164   gtk_drag_source_set (GTK_WIDGET (link_button),
 165                        GDK_BUTTON1_MASK,
 166                        link_drop_types, G_N_ELEMENTS (link_drop_types),
 167                        GDK_ACTION_COPY);
 168 }
 169
 170 static void
 171 gtk_link_button_finalize (GObject *object)
 172 {
 173   GtkLinkButton *link_button = GTK_LINK_BUTTON (object);
 174
 175   g_free (link_button->priv->uri);
 176
 177   G_OBJECT_CLASS (gtk_link_button_parent_class)->finalize (object);
 178 }
 179
 180 static void
 181 gtk_link_button_get_property (GObject    *object,
 182                               guint       prop_id,
 183                               GValue     *value,
 184                               GParamSpec *pspec)
 185 {
 186   GtkLinkButton *link_button = GTK_LINK_BUTTON (object);
 187
 188   switch (prop_id)
 189     {
 190     case PROP_URI:
 191       g_value_set_string (value, link_button->priv->uri);
 192       break;
 193     default:
 194       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 195       break;
 196     }
 197 }
 198
 199 static void
 200 gtk_link_button_set_property (GObject      *object,
 201                               guint         prop_id,
 202                               const GValue *value,
 203                               GParamSpec   *pspec)
 204 {
 205   GtkLinkButton *link_button = GTK_LINK_BUTTON (object);
 206
 207   switch (prop_id)
 208     {
 209     case PROP_URI:
 210       gtk_link_button_set_uri (link_button, g_value_get_string (value));
 211       break;
 212     default:
 213       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 214       break;
 215     }
 216 }
 217
 218 static void
 219 set_link_color (GtkLinkButton *link_button)
 220 {
 221   GdkColor *link_color = NULL;
 222   GtkWidget *label;
 223
 224   label = gtk_bin_get_child (GTK_BIN (link_button));
 225
 226   if (link_button->priv->visited)
 227     {
 228       gtk_widget_style_get (GTK_WIDGET (link_button),
 229                             "visited-link-color", &link_color, NULL);
 230       if (!link_color)
 231         link_color = &default_visited_link_color;
 232     }
 233   else
 234     {
 235       gtk_widget_style_get (GTK_WIDGET (link_button),
 236                             "link-color", &link_color, NULL);
 237       if (!link_color)
 238         link_color = &default_link_color;
 239     }
 240
 241   gtk_widget_modify_fg (label, GTK_STATE_NORMAL, link_color);
 242   gtk_widget_modify_fg (label, GTK_STATE_ACTIVE, link_color);
 243   gtk_widget_modify_fg (label, GTK_STATE_PRELIGHT, link_color);
 244   gtk_widget_modify_fg (label, GTK_STATE_SELECTED, link_color);
 245
 246   if (link_color != &default_link_color &&
 247       link_color != &default_visited_link_color)
 248     gdk_color_free (link_color);
 249 }
 250
 251 static void
 252 set_link_underline (GtkLinkButton *link_button)
 253 {
 254   GtkWidget *label;
 255
 256   label = gtk_bin_get_child (GTK_BIN (link_button));
 257   if (GTK_IS_LABEL (label))
 258     {
 259       PangoAttrList *attributes;
 260       PangoAttribute *uline;
 261
 262       uline = pango_attr_underline_new (PANGO_UNDERLINE_SINGLE);
 263       uline->start_index = 0;
 264       uline->end_index = G_MAXUINT;
 265       attributes = pango_attr_list_new ();
 266       pango_attr_list_insert (attributes, uline);
 267       gtk_label_set_attributes (GTK_LABEL (label), attributes);
 268     }
 269 }
 270
 271 static void
 272 gtk_link_button_add (GtkContainer *container,
 273                      GtkWidget    *widget)
 274 {
 275   GTK_CONTAINER_CLASS (gtk_link_button_parent_class)->add (container, widget);
 276
 277   set_link_underline (GTK_LINK_BUTTON (container));
 278 }
 279
 280 static void
 281 gtk_link_button_style_set (GtkWidget *widget,
 282                            GtkStyle  *old_style)
 283 {
 284   GtkLinkButton *link_button = GTK_LINK_BUTTON (widget);
 285
 286   set_link_color (link_button);
 287 }
 288
 289 static void
 290 set_hand_cursor (GtkWidget *widget,
 291                  gboolean   show_hand)
 292 {
 293   GdkDisplay *display;
 294   GdkCursor *cursor;
 295
 296   display = gtk_widget_get_display (widget);
 297
 298   cursor = NULL;
 299   if (show_hand)
 300     cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
 301
 302   gdk_window_set_cursor (widget->window, cursor);
 303   gdk_display_flush (display);
 304
 305   if (cursor)
 306     gdk_cursor_unref (cursor);
 307 }
 308
 309 static void
 310 popup_menu_detach (GtkWidget *attach_widget,
 311                    GtkMenu   *menu)
 312 {
 313   GtkLinkButton *link_button = GTK_LINK_BUTTON (attach_widget);
 314
 315   link_button->priv->popup_menu = NULL;
 316 }
 317
 318 static void
 319 popup_position_func (GtkMenu  *menu,
 320                      gint     *x,
 321                      gint     *y,
 322                      gboolean *push_in,
 323                      gpointer  user_data)
 324 {
 325   GtkLinkButton *link_button = GTK_LINK_BUTTON (user_data);
 326   GtkLinkButtonPrivate *priv = link_button->priv;
 327   GtkWidget *widget = GTK_WIDGET (link_button);
 328   GdkScreen *screen = gtk_widget_get_screen (widget);
 329   GtkRequisition req;
 330   gint monitor_num;
 331   GdkRectangle monitor;
 332
 333   g_return_if_fail (GTK_WIDGET_REALIZED (link_button));
 334
 335   gdk_window_get_origin (widget->window, x, y);
 336
 337   gtk_widget_size_request (priv->popup_menu, &req);
 338
 339   *x += widget->allocation.width / 2;
 340   *y += widget->allocation.height;
 341
 342   monitor_num = gdk_screen_get_monitor_at_point (screen, *x, *y);
 343   gtk_menu_set_monitor (menu, monitor_num);
 344   gdk_screen_get_monitor_geometry (screen, monitor_num, &monitor);
 345
 346   *x = CLAMP (*x, monitor.x, monitor.x + MAX (0, monitor.width - req.width));
 347   *y = CLAMP (*y, monitor.y, monitor.y + MAX (0, monitor.height - req.height));
 348
 349   *push_in = FALSE;
 350 }
 351
 352 static void
 353 copy_activate_cb (GtkWidget     *widget,
 354                   GtkLinkButton *link_button)
 355 {
 356   GtkLinkButtonPrivate *priv = link_button->priv;
 357
 358   gtk_clipboard_set_text (gtk_widget_get_clipboard (GTK_WIDGET (link_button),
 359                                                     GDK_SELECTION_CLIPBOARD),
 360                           priv->uri, -1);
 361 }
 362
 363 static void
 364 gtk_link_button_do_popup (GtkLinkButton  *link_button,
 365                           GdkEventButton *event)
 366 {
 367   GtkLinkButtonPrivate *priv = link_button->priv;
 368   gint button;
 369   guint time;
 370
 371   if (event)
 372     {
 373       button = event->button;
 374       time = event->time;
 375     }
 376   else
 377     {
 378       button = 0;
 379       time = gtk_get_current_event_time ();
 380     }
 381
 382   if (GTK_WIDGET_REALIZED (link_button))
 383     {
 384       GtkWidget *menu_item;
 385
 386       if (priv->popup_menu)
 387         gtk_widget_destroy (priv->popup_menu);
 388
 389       priv->popup_menu = gtk_menu_new ();
 390
 391       gtk_menu_attach_to_widget (GTK_MENU (priv->popup_menu),
 392                                  GTK_WIDGET (link_button),
 393                                  popup_menu_detach);
 394
 395       menu_item = gtk_image_menu_item_new_with_mnemonic (_("Copy URL"));
 396       gtk_image_menu_item_set_image (GTK_IMAGE_MENU_ITEM (menu_item),
 397                                      gtk_image_new_from_stock (GTK_STOCK_COPY,
 398                                                                GTK_ICON_SIZE_MENU));
 399       g_signal_connect (menu_item, "activate",
 400                         G_CALLBACK (copy_activate_cb), link_button);
 401       gtk_widget_show (menu_item);
 402       gtk_menu_shell_append (GTK_MENU_SHELL (priv->popup_menu), menu_item);
 403
 404       if (button)
 405         gtk_menu_popup (GTK_MENU (priv->popup_menu), NULL, NULL,
 406                         NULL, NULL,
 407                         button, time);
 408       else
 409         {
 410           gtk_menu_popup (GTK_MENU (priv->popup_menu), NULL, NULL,
 411                           popup_position_func, link_button,
 412                           button, time);
 413           gtk_menu_shell_select_first (GTK_MENU_SHELL (priv->popup_menu), FALSE);
 414         }
 415     }
 416 }
 417
 418 static gboolean
 419 gtk_link_button_button_press (GtkWidget      *widget,
 420                               GdkEventButton *event)
 421 {
 422   if (!GTK_WIDGET_HAS_FOCUS (widget))
 423     gtk_widget_grab_focus (widget);
 424
 425   if ((event->button == 3) && (event->type == GDK_BUTTON_PRESS))
 426     {
 427       gtk_link_button_do_popup (GTK_LINK_BUTTON (widget), event);
 428
 429       return TRUE;
 430     }
 431
 432   if (GTK_WIDGET_CLASS (gtk_link_button_parent_class)->button_press_event)
 433     return (* GTK_WIDGET_CLASS (gtk_link_button_parent_class)->button_press_event) (widget, event);
 434
 435   return FALSE;
 436 }
 437
 438 static void
 439 gtk_link_button_clicked (GtkButton *button)
 440 {
 441   GtkLinkButton *link_button = GTK_LINK_BUTTON (button);
 442
 443   if (uri_func)
 444     (* uri_func) (button, link_button->priv->uri, uri_func_data);
 445
 446   link_button->priv->visited = TRUE;
 447
 448   set_link_color (link_button);
 449 }
 450
 451 static gboolean
 452 gtk_link_button_popup_menu (GtkWidget *widget)
 453 {
 454   gtk_link_button_do_popup (GTK_LINK_BUTTON (widget), NULL);
 455
 456   return TRUE;
 457 }
 458
 459 static gboolean
 460 gtk_link_button_enter_cb (GtkWidget        *widget,
 461                           GdkEventCrossing *crossing,
 462                           gpointer          user_data)
 463 {
 464   set_hand_cursor (widget, TRUE);
 465
 466   return FALSE;
 467 }
 468
 469 static gboolean
 470 gtk_link_button_leave_cb (GtkWidget        *widget,
 471                           GdkEventCrossing *crossing,
 472                           gpointer          user_data)
 473 {
 474   set_hand_cursor (widget, FALSE);
 475
 476   return FALSE;
 477 }
 478
 479 static void
 480 gtk_link_button_drag_data_get_cb (GtkWidget        *widget,
 481                                   GdkDragContext   *context,
 482                                   GtkSelectionData *selection,
 483                                   guint             _info,
 484                                   guint             _time,
 485                                   gpointer          user_data)
 486 {
 487   GtkLinkButton *link_button = GTK_LINK_BUTTON (widget);
 488   gchar *uri;
 489
 490   uri = g_strdup_printf ("%s\r\n", link_button->priv->uri);
 491   gtk_selection_data_set (selection,
 492                           selection->target,
 493                           8,
 494                           (guchar *) uri,
 495                           strlen (uri));
 496
 497   g_free (uri);
 498 }
 499
 500 /**
 501  * gtk_link_button_new:
 502  * @uri: a valid URI
 503  *
 504  * Creates a new #GtkLinkButton with the URI as its text.
 505  *
 506  * Return value: a new link button widget.
 507  *
 508  * Since: 2.10
 509  */
 510 GtkWidget *
 511 gtk_link_button_new (const gchar *uri)
 512 {
 513   gchar *utf8_uri = NULL;
 514   GtkWidget *retval;
 515
 516   g_return_val_if_fail (uri != NULL, NULL);
 517
 518   if (g_utf8_validate (uri, -1, NULL))
 519     {
 520       utf8_uri = g_strdup (uri);
 521     }
 522   else
 523     {
 524       GError *conv_err = NULL;
 525
 526       utf8_uri = g_locale_to_utf8 (uri, -1, NULL, NULL, &conv_err);
 527       if (conv_err)
 528         {
 529           g_warning ("Attempting to convert URI `%s' to UTF-8, but failed "
 530                      "with error: %s\n",
 531                      uri,
 532                      conv_err->message);
 533           g_error_free (conv_err);
 534
 535           utf8_uri = g_strdup (_("Invalid URI"));
 536         }
 537     }
 538
 539   retval = g_object_new (GTK_TYPE_LINK_BUTTON,
 540                          "uri", uri,
 541                          "label", utf8_uri,
 542                          NULL);
 543
 544   g_free (utf8_uri);
 545
 546   return retval;
 547 }
 548
 549 /**
 550  * gtk_link_button_new_with_label:
 551  * @uri: a valid URI
 552  * @label: the text of the button
 553  *
 554  * Creates a new #GtkLinkButton containing a label.
 555  *
 556  * Return value: a new link button widget.
 557  *
 558  * Since: 2.10
 559  */
 560 GtkWidget *
 561 gtk_link_button_new_with_label (const gchar *uri,
 562                                 const gchar *label)
 563 {
 564   GtkWidget *retval;
 565
 566   g_return_val_if_fail (uri != NULL, NULL);
 567
 568   if (!label)
 569     return gtk_link_button_new (uri);
 570
 571   retval = g_object_new (GTK_TYPE_LINK_BUTTON,
 572                          "label", label,
 573                          "uri", uri,
 574                          NULL);
 575
 576   return retval;
 577 }
 578
 579 /**
 580  * gtk_link_button_set_uri:
 581  * @link_button: a #GtkLinkButton
 582  * @uri: a valid URI
 583  *
 584  * Sets @uri as the URI where the #GtkLinkButton points.
 585  *
 586  * Since: 2.10
 587  */
 588 void
 589 gtk_link_button_set_uri (GtkLinkButton *link_button,
 590                          const gchar   *uri)
 591 {
 592   gchar *tmp;
 593
 594   g_return_if_fail (GTK_IS_LINK_BUTTON (link_button));
 595   g_return_if_fail (uri != NULL);
 596
 597   tmp = link_button->priv->uri;
 598   link_button->priv->uri = g_strdup (uri);
 599   g_free (tmp);
 600
 601   link_button->priv->visited = FALSE;
 602
 603   g_object_notify (G_OBJECT (link_button), "uri");
 604 }
 605
 606 /**
 607  * gtk_link_button_get_uri:
 608  * @link_button: a #GtkLinkButton
 609  *
 610  * Retrieves the URI set using gtk_link_button_set_uri().
 611  *
 612  * Return value: a valid URI.  The returned string is owned by the link button
 613  *   and should not be modified or freed.
 614  *
 615  * Since: 2.10
 616  */
 617 G_CONST_RETURN gchar *
 618 gtk_link_button_get_uri (GtkLinkButton *link_button)
 619 {
 620   g_return_val_if_fail (GTK_IS_LINK_BUTTON (link_button), NULL);
 621
 622   return link_button->priv->uri;
 623 }
 624
 625 /**
 626  * gtk_link_button_set_uri_hook:
 627  * @func: a function called each time a #GtkLinkButton is clicked, or %NULL
 628  * @data: user data to be passed to @func, or %NULL
 629  * @destroy: a #GDestroyNotify that gets called when @data is no longer needed, or %NULL
 630  *
 631  * Sets @func as the function that should be invoked every time a user clicks
 632  * a #GtkLinkButton. This function is called before every callback registered
 633  * for the "clicked" signal.
 634  *
 635  * Return value: the previously set hook function.
 636  *
 637  * Since: 2.10
 638  */
 639 GtkLinkButtonUriFunc
 640 gtk_link_button_set_uri_hook (GtkLinkButtonUriFunc func,
 641                               gpointer             data,
 642                               GDestroyNotify       destroy)
 643 {
 644   GtkLinkButtonUriFunc old_uri_func;
 645
 646   if (uri_func_destroy)
 647     (* uri_func_destroy) (uri_func_data);
 648
 649   old_uri_func = uri_func;
 650
 651   uri_func = func;
 652   uri_func_data = data;
 653   uri_func_destroy = destroy;
 654
 655   return old_uri_func;
 656 }
 657
 658 #define __GTK_LINK_BUTTON_C__
 659 #include "gtkaliasdef.c"