shell/ev-navigation-action.c

   1 /*
   2  *  Copyright (C) 2003, 2004 Marco Pesenti Gritti
   3  *  Copyright (C) 2003, 2004 Christian Persch
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2, or (at your option)
   8  *  any later version.
   9  *
  10  *  This program 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
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  *
  19  */
  20
  21 #include "config.h"
  22
  23 #include "ev-navigation-action.h"
  24 #include "ev-navigation-action-widget.h"
  25
  26 #include <gtk/gtklabel.h>
  27 #include <gtk/gtkimage.h>
  28 #include <gtk/gtkmenuitem.h>
  29 #include <gtk/gtkimagemenuitem.h>
  30 #include <gtk/gtkmenushell.h>
  31 #include <gtk/gtkmenu.h>
  32 #include <gtk/gtkmenutoolbutton.h>
  33 #include <glib/gi18n.h>
  34
  35 enum
  36 {
  37         WIDGET_ACTIVATE_LINK,
  38         WIDGET_N_SIGNALS
  39 };
  40
  41 static guint widget_signals[WIDGET_N_SIGNALS] = {0, };
  42
  43 struct _EvNavigationActionPrivate
  44 {
  45         EvHistory *history;
  46 };
  47
  48 static void ev_navigation_action_init       (EvNavigationAction *action);
  49 static void ev_navigation_action_class_init (EvNavigationActionClass *class);
  50
  51 G_DEFINE_TYPE (EvNavigationAction, ev_navigation_action, GTK_TYPE_ACTION)
  52
  53 #define MAX_LABEL_LENGTH 48
  54
  55 #define EV_NAVIGATION_ACTION_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EV_TYPE_NAVIGATION_ACTION, EvNavigationActionPrivate))
  56
  57 void
  58 ev_navigation_action_set_history (EvNavigationAction *action,
  59                                   EvHistory          *history)
  60 {
  61         action->priv->history = history;
  62
  63         g_object_add_weak_pointer (G_OBJECT (action->priv->history),
  64                                    (gpointer *) &action->priv->history);
  65 }
  66
  67 static void
  68 activate_menu_item_cb (GtkWidget *widget, EvNavigationAction *action)
  69 {
  70         int index;
  71
  72         g_return_if_fail (EV_IS_HISTORY (action->priv->history));
  73
  74         index = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (widget), "index"));
  75         ev_history_set_current_index (action->priv->history, index);
  76
  77         if (action->priv->history) {
  78                 EvLink *link;
  79
  80                 link = ev_history_get_link_nth (action->priv->history, index);
  81
  82                 g_signal_emit (action, widget_signals[WIDGET_ACTIVATE_LINK], 0, link);
  83         }
  84 }
  85
  86 static GtkWidget *
  87 new_history_menu_item (EvNavigationAction *action,
  88                        EvLink             *link,
  89                        int                 index)
  90 {
  91         GtkLabel *label;
  92         GtkWidget *item;
  93         const char *title;
  94
  95         title = ev_link_get_title (link);
  96         item = gtk_image_menu_item_new_with_label (title);
  97         g_object_set_data (G_OBJECT (item), "index",
  98                            GINT_TO_POINTER (index));
  99
 100         label = GTK_LABEL (GTK_BIN (item)->child);
 101         gtk_label_set_ellipsize (label, PANGO_ELLIPSIZE_END);
 102         gtk_label_set_max_width_chars (label, MAX_LABEL_LENGTH);
 103
 104         g_signal_connect (item, "activate",
 105                           G_CALLBACK (activate_menu_item_cb),
 106                           action);
 107
 108         gtk_widget_show (item);
 109
 110         return item;
 111 }
 112
 113 static GtkWidget *
 114 new_empty_history_menu_item (EvNavigationAction *action)
 115 {
 116         GtkWidget *item;
 117
 118         item = gtk_image_menu_item_new_with_label (_("Empty"));
 119         gtk_widget_set_sensitive (item, FALSE);
 120         gtk_widget_show (item);
 121
 122         return item;
 123 }
 124
 125 static GtkWidget *
 126 build_menu (EvNavigationAction *action)
 127 {
 128         GtkMenuShell *menu;
 129         GtkWidget *item;
 130         EvLink *link;
 131         EvHistory *history = action->priv->history;
 132         int start, end, i;
 133
 134         menu = GTK_MENU_SHELL (gtk_menu_new ());
 135
 136         if (history == NULL || ev_history_get_n_links (history) <= 0) {
 137                 item = new_empty_history_menu_item (action);
 138                 gtk_menu_shell_append (menu, item);
 139                 return GTK_WIDGET (menu);
 140         }
 141
 142         start = MAX (ev_history_get_current_index (action->priv->history) - 5, 0);
 143         end = MIN (ev_history_get_n_links (history), start + 7);
 144
 145         for (i = start; i < end; i++) {
 146                 link = ev_history_get_link_nth (history, i);
 147                 item = new_history_menu_item (action, link, i);
 148                 gtk_menu_shell_prepend (menu, item);
 149         }
 150
 151         return GTK_WIDGET (menu);
 152 }
 153
 154 static void
 155 menu_activated_cb (EvNavigationActionWidget *button,
 156                    EvNavigationAction *action)
 157 {
 158         GtkWidget *menu;
 159
 160         menu = build_menu (action);
 161         ev_navigation_action_widget_set_menu (button, menu);
 162 }
 163
 164 static void
 165 connect_proxy (GtkAction *action, GtkWidget *proxy)
 166 {
 167         GtkWidget *menu;
 168
 169         /* set dummy menu so the arrow gets sensitive */
 170         menu = gtk_menu_new ();
 171         ev_navigation_action_widget_set_menu (EV_NAVIGATION_ACTION_WIDGET (proxy), menu);
 172
 173         g_signal_connect (proxy, "show-menu",
 174                           G_CALLBACK (menu_activated_cb), action);
 175
 176         GTK_ACTION_CLASS (ev_navigation_action_parent_class)->connect_proxy (action, proxy);
 177 }
 178
 179 static GtkWidget *
 180 create_tool_item (GtkAction *action)
 181 {
 182         EvNavigationActionWidget *proxy;
 183
 184         proxy = g_object_new (EV_TYPE_NAVIGATION_ACTION_WIDGET, NULL);
 185         gtk_widget_show (GTK_WIDGET (proxy));
 186
 187         return GTK_WIDGET (proxy);
 188 }
 189
 190 static void
 191 ev_navigation_action_init (EvNavigationAction *action)
 192 {
 193         action->priv = EV_NAVIGATION_ACTION_GET_PRIVATE (action);
 194 }
 195
 196 static void
 197 ev_navigation_action_finalize (GObject *object)
 198 {
 199         EvNavigationAction *action = EV_NAVIGATION_ACTION (object);
 200
 201         if (action->priv->history) {
 202                 g_object_add_weak_pointer (G_OBJECT (action->priv->history),
 203                                            (gpointer *) &action->priv->history);
 204         }
 205
 206         G_OBJECT_CLASS (ev_navigation_action_parent_class)->finalize (object);
 207 }
 208
 209 static void
 210 ev_navigation_action_class_init (EvNavigationActionClass *class)
 211 {
 212         GObjectClass *object_class = G_OBJECT_CLASS (class);
 213         GtkActionClass *action_class = GTK_ACTION_CLASS (class);
 214
 215         object_class->finalize = ev_navigation_action_finalize;
 216
 217         action_class->toolbar_item_type = GTK_TYPE_TOOL_ITEM;
 218         action_class->create_tool_item = create_tool_item;
 219         action_class->connect_proxy = connect_proxy;
 220
 221         widget_signals[WIDGET_ACTIVATE_LINK] = g_signal_new ("activate_link",
 222                                                G_OBJECT_CLASS_TYPE (object_class),
 223                                                G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 224                                                G_STRUCT_OFFSET (EvNavigationActionClass, activate_link),
 225                                                NULL, NULL,
 226                                                g_cclosure_marshal_VOID__OBJECT,
 227                                                G_TYPE_NONE, 1,
 228                                                G_TYPE_OBJECT);
 229
 230         g_type_class_add_private (object_class, sizeof (EvNavigationActionPrivate));
 231 }