/* GTK - The GIMP Toolkit * gtklinkbutton.c - an hyperlink-enabled button * * Copyright (C) 2006 Emmanuele Bassi * All rights reserved. * * Based on gnome-href code by: * James Henstridge * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library. If not, see . */ /** * SECTION:gtklinkbutton * @Title: GtkLinkButton * @Short_description: Create buttons bound to a URL * @See_also: #GtkButton * * A GtkLinkButton is a #GtkButton with a hyperlink, similar to the one * used by web browsers, which triggers an action when clicked. It is useful * to show quick links to resources. * * A link button is created by calling either gtk_link_button_new() or * gtk_link_button_new_with_label(). If using the former, the URI you pass * to the constructor is used as a label for the widget. * * The URI bound to a GtkLinkButton can be set specifically using * gtk_link_button_set_uri(), and retrieved using gtk_link_button_get_uri(). * * By default, GtkLinkButton calls gtk_show_uri() when the button is * clicked. This behaviour can be overridden by connecting to the * #GtkLinkButton::activate-link signal and returning %TRUE from the * signal handler. * * # CSS nodes * * GtkLinkButton has a single CSS node with name button. To differentiate * it from a plain #GtkButton, it gets the .link style class. */ #include "config.h" #include "gtklinkbutton.h" #include #include "gtkclipboard.h" #include "gtkdnd.h" #include "gtklabel.h" #include "gtkmain.h" #include "gtkmarshalers.h" #include "gtkmenu.h" #include "gtkmenuitem.h" #include "gtksizerequest.h" #include "gtkshow.h" #include "gtktooltip.h" #include "gtkprivate.h" #include "gtkintl.h" #include "a11y/gtklinkbuttonaccessible.h" struct _GtkLinkButtonPrivate { gchar *uri; gboolean visited; GtkWidget *popup_menu; }; enum { PROP_0, PROP_URI, PROP_VISITED }; enum { ACTIVATE_LINK, LAST_SIGNAL }; static void gtk_link_button_finalize (GObject *object); static void gtk_link_button_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); static void gtk_link_button_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static gboolean gtk_link_button_button_press (GtkWidget *widget, GdkEventButton *event); static void gtk_link_button_clicked (GtkButton *button); static gboolean gtk_link_button_popup_menu (GtkWidget *widget); static void gtk_link_button_unrealize (GtkWidget *widget); static gboolean gtk_link_button_enter_cb (GtkWidget *widget, GdkEventCrossing *event, gpointer user_data); static gboolean gtk_link_button_leave_cb (GtkWidget *widget, GdkEventCrossing *event, gpointer user_data); static void gtk_link_button_drag_data_get_cb (GtkWidget *widget, GdkDragContext *context, GtkSelectionData *selection, guint _info, guint _time, gpointer user_data); static gboolean gtk_link_button_query_tooltip_cb (GtkWidget *widget, gint x, gint y, gboolean keyboard_tip, GtkTooltip *tooltip, gpointer data); static gboolean gtk_link_button_activate_link (GtkLinkButton *link_button); static const GtkTargetEntry link_drop_types[] = { { "text/uri-list", 0, 0 }, { "_NETSCAPE_URL", 0, 0 } }; static guint link_signals[LAST_SIGNAL] = { 0, }; G_DEFINE_TYPE_WITH_PRIVATE (GtkLinkButton, gtk_link_button, GTK_TYPE_BUTTON) static void gtk_link_button_class_init (GtkLinkButtonClass *klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass); GtkButtonClass *button_class = GTK_BUTTON_CLASS (klass); gobject_class->set_property = gtk_link_button_set_property; gobject_class->get_property = gtk_link_button_get_property; gobject_class->finalize = gtk_link_button_finalize; widget_class->button_press_event = gtk_link_button_button_press; widget_class->popup_menu = gtk_link_button_popup_menu; widget_class->unrealize = gtk_link_button_unrealize; button_class->clicked = gtk_link_button_clicked; klass->activate_link = gtk_link_button_activate_link; /** * GtkLinkButton:uri: * * The URI bound to this button. * * Since: 2.10 */ g_object_class_install_property (gobject_class, PROP_URI, g_param_spec_string ("uri", P_("URI"), P_("The URI bound to this button"), NULL, GTK_PARAM_READWRITE)); /** * GtkLinkButton:visited: * * The 'visited' state of this button. A visited link is drawn in a * different color. * * Since: 2.14 */ g_object_class_install_property (gobject_class, PROP_VISITED, g_param_spec_boolean ("visited", P_("Visited"), P_("Whether this link has been visited."), FALSE, GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY)); /** * GtkLinkButton::activate-link: * @button: the #GtkLinkButton that emitted the signal * * The ::activate-link signal is emitted each time the #GtkLinkButton * has been clicked. * * The default handler will call gtk_show_uri() with the URI stored inside * the #GtkLinkButton:uri property. * * To override the default behavior, you can connect to the ::activate-link * signal and stop the propagation of the signal by returning %TRUE from * your handler. */ link_signals[ACTIVATE_LINK] = g_signal_new (I_("activate-link"), G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GtkLinkButtonClass, activate_link), _gtk_boolean_handled_accumulator, NULL, _gtk_marshal_BOOLEAN__VOID, G_TYPE_BOOLEAN, 0); gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_LINK_BUTTON_ACCESSIBLE); gtk_widget_class_set_css_name (widget_class, "button"); } static void gtk_link_button_init (GtkLinkButton *link_button) { GtkStyleContext *context; link_button->priv = gtk_link_button_get_instance_private (link_button); gtk_button_set_relief (GTK_BUTTON (link_button), GTK_RELIEF_NONE); gtk_widget_set_state_flags (GTK_WIDGET (link_button), GTK_STATE_FLAG_LINK, FALSE); g_signal_connect (link_button, "enter-notify-event", G_CALLBACK (gtk_link_button_enter_cb), NULL); g_signal_connect (link_button, "leave-notify-event", G_CALLBACK (gtk_link_button_leave_cb), NULL); g_signal_connect (link_button, "drag-data-get", G_CALLBACK (gtk_link_button_drag_data_get_cb), NULL); g_object_set (link_button, "has-tooltip", TRUE, NULL); g_signal_connect (link_button, "query-tooltip", G_CALLBACK (gtk_link_button_query_tooltip_cb), NULL); /* enable drag source */ gtk_drag_source_set (GTK_WIDGET (link_button), GDK_BUTTON1_MASK, link_drop_types, G_N_ELEMENTS (link_drop_types), GDK_ACTION_COPY); context = gtk_widget_get_style_context (GTK_WIDGET (link_button)); gtk_style_context_add_class (context, "link"); } static void gtk_link_button_finalize (GObject *object) { GtkLinkButton *link_button = GTK_LINK_BUTTON (object); g_free (link_button->priv->uri); G_OBJECT_CLASS (gtk_link_button_parent_class)->finalize (object); } static void gtk_link_button_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GtkLinkButton *link_button = GTK_LINK_BUTTON (object); switch (prop_id) { case PROP_URI: g_value_set_string (value, link_button->priv->uri); break; case PROP_VISITED: g_value_set_boolean (value, link_button->priv->visited); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gtk_link_button_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GtkLinkButton *link_button = GTK_LINK_BUTTON (object); switch (prop_id) { case PROP_URI: gtk_link_button_set_uri (link_button, g_value_get_string (value)); break; case PROP_VISITED: gtk_link_button_set_visited (link_button, g_value_get_boolean (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void set_hand_cursor (GtkWidget *widget, gboolean show_hand) { GdkDisplay *display; GdkCursor *cursor; display = gtk_widget_get_display (widget); cursor = NULL; if (show_hand) cursor = gdk_cursor_new_from_name (display, "pointer"); gdk_window_set_cursor (gtk_widget_get_window (widget), cursor); gdk_display_flush (display); if (cursor) g_object_unref (cursor); } static void gtk_link_button_unrealize (GtkWidget *widget) { set_hand_cursor (widget, FALSE); GTK_WIDGET_CLASS (gtk_link_button_parent_class)->unrealize (widget); } static void popup_menu_detach (GtkWidget *attach_widget, GtkMenu *menu) { GtkLinkButton *link_button = GTK_LINK_BUTTON (attach_widget); link_button->priv->popup_menu = NULL; } static void popup_position_func (GtkMenu *menu, gint *x, gint *y, gboolean *push_in, gpointer user_data) { GtkLinkButton *link_button = GTK_LINK_BUTTON (user_data); GtkLinkButtonPrivate *priv = link_button->priv; GtkAllocation allocation; GtkWidget *widget = GTK_WIDGET (link_button); GdkDisplay *display; GdkMonitor *monitor; GtkRequisition req; GdkRectangle area; g_return_if_fail (gtk_widget_get_realized (widget)); gdk_window_get_origin (gtk_widget_get_window (widget), x, y); gtk_widget_get_preferred_size (priv->popup_menu, &req, NULL); gtk_widget_get_allocation (widget, &allocation); *x += allocation.width / 2; *y += allocation.height; display = gtk_widget_get_display (widget); monitor = gdk_display_get_monitor_at_point (display, *x, *y); gtk_menu_place_on_monitor (menu, monitor); gdk_monitor_get_workarea (monitor, &area); *x = CLAMP (*x, area.x, area.x + MAX (0, area.width - req.width)); *y = CLAMP (*y, area.y, area.y + MAX (0, area.height - req.height)); *push_in = FALSE; } static void copy_activate_cb (GtkWidget *widget, GtkLinkButton *link_button) { GtkLinkButtonPrivate *priv = link_button->priv; gtk_clipboard_set_text (gtk_widget_get_clipboard (GTK_WIDGET (link_button), GDK_SELECTION_CLIPBOARD), priv->uri, -1); } static void gtk_link_button_do_popup (GtkLinkButton *link_button, GdkEventButton *event) { GtkLinkButtonPrivate *priv = link_button->priv; gint button; guint time; if (event) { button = event->button; time = event->time; } else { button = 0; time = gtk_get_current_event_time (); } if (gtk_widget_get_realized (GTK_WIDGET (link_button))) { GtkWidget *menu_item; if (priv->popup_menu) gtk_widget_destroy (priv->popup_menu); priv->popup_menu = gtk_menu_new (); gtk_style_context_add_class (gtk_widget_get_style_context (priv->popup_menu), GTK_STYLE_CLASS_CONTEXT_MENU); gtk_menu_attach_to_widget (GTK_MENU (priv->popup_menu), GTK_WIDGET (link_button), popup_menu_detach); menu_item = gtk_menu_item_new_with_mnemonic (_("Copy URL")); g_signal_connect (menu_item, "activate", G_CALLBACK (copy_activate_cb), link_button); gtk_widget_show (menu_item); gtk_menu_shell_append (GTK_MENU_SHELL (priv->popup_menu), menu_item); if (button) gtk_menu_popup (GTK_MENU (priv->popup_menu), NULL, NULL, NULL, NULL, button, time); else { gtk_menu_popup (GTK_MENU (priv->popup_menu), NULL, NULL, popup_position_func, link_button, button, time); gtk_menu_shell_select_first (GTK_MENU_SHELL (priv->popup_menu), FALSE); } } } static gboolean gtk_link_button_button_press (GtkWidget *widget, GdkEventButton *event) { if (!gtk_widget_has_focus (widget)) gtk_widget_grab_focus (widget); /* Don't popup the menu if there's no URI set, * otherwise the menu item will trigger a warning */ if (gdk_event_triggers_context_menu ((GdkEvent *) event) && GTK_LINK_BUTTON (widget)->priv->uri != NULL) { gtk_link_button_do_popup (GTK_LINK_BUTTON (widget), event); return TRUE; } if (GTK_WIDGET_CLASS (gtk_link_button_parent_class)->button_press_event) return GTK_WIDGET_CLASS (gtk_link_button_parent_class)->button_press_event (widget, event); return FALSE; } static gboolean gtk_link_button_activate_link (GtkLinkButton *link_button) { GdkScreen *screen; GError *error; if (gtk_widget_has_screen (GTK_WIDGET (link_button))) screen = gtk_widget_get_screen (GTK_WIDGET (link_button)); else screen = NULL; error = NULL; gtk_show_uri (screen, link_button->priv->uri, GDK_CURRENT_TIME, &error); if (error) { g_warning ("Unable to show '%s': %s", link_button->priv->uri, error->message); g_error_free (error); return FALSE; } gtk_link_button_set_visited (link_button, TRUE); return TRUE; } static void gtk_link_button_clicked (GtkButton *button) { gboolean retval = FALSE; g_signal_emit (button, link_signals[ACTIVATE_LINK], 0, &retval); } static gboolean gtk_link_button_popup_menu (GtkWidget *widget) { gtk_link_button_do_popup (GTK_LINK_BUTTON (widget), NULL); return TRUE; } static gboolean gtk_link_button_enter_cb (GtkWidget *widget, GdkEventCrossing *crossing, gpointer user_data) { set_hand_cursor (widget, TRUE); return FALSE; } static gboolean gtk_link_button_leave_cb (GtkWidget *widget, GdkEventCrossing *crossing, gpointer user_data) { set_hand_cursor (widget, FALSE); return FALSE; } static void gtk_link_button_drag_data_get_cb (GtkWidget *widget, GdkDragContext *context, GtkSelectionData *selection, guint _info, guint _time, gpointer user_data) { GtkLinkButton *link_button = GTK_LINK_BUTTON (widget); gchar *uri; uri = g_strdup_printf ("%s\r\n", link_button->priv->uri); gtk_selection_data_set (selection, gtk_selection_data_get_target (selection), 8, (guchar *) uri, strlen (uri)); g_free (uri); } /** * gtk_link_button_new: * @uri: a valid URI * * Creates a new #GtkLinkButton with the URI as its text. * * Returns: a new link button widget. * * Since: 2.10 */ GtkWidget * gtk_link_button_new (const gchar *uri) { gchar *utf8_uri = NULL; GtkWidget *retval; g_return_val_if_fail (uri != NULL, NULL); if (g_utf8_validate (uri, -1, NULL)) { utf8_uri = g_strdup (uri); } else { GError *conv_err = NULL; utf8_uri = g_locale_to_utf8 (uri, -1, NULL, NULL, &conv_err); if (conv_err) { g_warning ("Attempting to convert URI '%s' to UTF-8, but failed " "with error: %s", uri, conv_err->message); g_error_free (conv_err); utf8_uri = g_strdup (_("Invalid URI")); } } retval = g_object_new (GTK_TYPE_LINK_BUTTON, "label", utf8_uri, "uri", uri, NULL); g_free (utf8_uri); return retval; } /** * gtk_link_button_new_with_label: * @uri: a valid URI * @label: (allow-none): the text of the button * * Creates a new #GtkLinkButton containing a label. * * Returns: (transfer none): a new link button widget. * * Since: 2.10 */ GtkWidget * gtk_link_button_new_with_label (const gchar *uri, const gchar *label) { GtkWidget *retval; g_return_val_if_fail (uri != NULL, NULL); if (!label) return gtk_link_button_new (uri); retval = g_object_new (GTK_TYPE_LINK_BUTTON, "label", label, "uri", uri, NULL); return retval; } static gboolean gtk_link_button_query_tooltip_cb (GtkWidget *widget, gint x, gint y, gboolean keyboard_tip, GtkTooltip *tooltip, gpointer data) { GtkLinkButton *link_button = GTK_LINK_BUTTON (widget); const gchar *label, *uri; label = gtk_button_get_label (GTK_BUTTON (link_button)); uri = link_button->priv->uri; if (!gtk_widget_get_tooltip_text (widget) && !gtk_widget_get_tooltip_markup (widget) && label && *label != '\0' && uri && strcmp (label, uri) != 0) { gtk_tooltip_set_text (tooltip, uri); return TRUE; } return FALSE; } /** * gtk_link_button_set_uri: * @link_button: a #GtkLinkButton * @uri: a valid URI * * Sets @uri as the URI where the #GtkLinkButton points. As a side-effect * this unsets the “visited” state of the button. * * Since: 2.10 */ void gtk_link_button_set_uri (GtkLinkButton *link_button, const gchar *uri) { GtkLinkButtonPrivate *priv; g_return_if_fail (GTK_IS_LINK_BUTTON (link_button)); g_return_if_fail (uri != NULL); priv = link_button->priv; g_free (priv->uri); priv->uri = g_strdup (uri); g_object_notify (G_OBJECT (link_button), "uri"); gtk_link_button_set_visited (link_button, FALSE); } /** * gtk_link_button_get_uri: * @link_button: a #GtkLinkButton * * Retrieves the URI set using gtk_link_button_set_uri(). * * Returns: a valid URI. The returned string is owned by the link button * and should not be modified or freed. * * Since: 2.10 */ const gchar * gtk_link_button_get_uri (GtkLinkButton *link_button) { g_return_val_if_fail (GTK_IS_LINK_BUTTON (link_button), NULL); return link_button->priv->uri; } /** * gtk_link_button_set_visited: * @link_button: a #GtkLinkButton * @visited: the new “visited” state * * Sets the “visited” state of the URI where the #GtkLinkButton * points. See gtk_link_button_get_visited() for more details. * * Since: 2.14 */ void gtk_link_button_set_visited (GtkLinkButton *link_button, gboolean visited) { g_return_if_fail (GTK_IS_LINK_BUTTON (link_button)); visited = visited != FALSE; if (link_button->priv->visited != visited) { link_button->priv->visited = visited; if (visited) { gtk_widget_unset_state_flags (GTK_WIDGET (link_button), GTK_STATE_FLAG_LINK); gtk_widget_set_state_flags (GTK_WIDGET (link_button), GTK_STATE_FLAG_VISITED, FALSE); } else { gtk_widget_unset_state_flags (GTK_WIDGET (link_button), GTK_STATE_FLAG_VISITED); gtk_widget_set_state_flags (GTK_WIDGET (link_button), GTK_STATE_FLAG_LINK, FALSE); } g_object_notify (G_OBJECT (link_button), "visited"); } } /** * gtk_link_button_get_visited: * @link_button: a #GtkLinkButton * * Retrieves the “visited” state of the URI where the #GtkLinkButton * points. The button becomes visited when it is clicked. If the URI * is changed on the button, the “visited” state is unset again. * * The state may also be changed using gtk_link_button_set_visited(). * * Returns: %TRUE if the link has been visited, %FALSE otherwise * * Since: 2.14 */ gboolean gtk_link_button_get_visited (GtkLinkButton *link_button) { g_return_val_if_fail (GTK_IS_LINK_BUTTON (link_button), FALSE); return link_button->priv->visited; }