cut-n-paste/zoom-control/ephy-zoom-action.c

   1 /*
   2  *  Copyright (C) 2003 Marco Pesenti Gritti
   3  *  Copyright (C) 2003, 2004 Christian Persch
   4  *
   5  *  Modified 2005 by James Bowes for use in evince.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2, or (at your option)
  10  *  any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  *
  21  *  $Id$
  22  */
  23
  24 #include "config.h"
  25
  26 #include "ephy-zoom-action.h"
  27 #include "ephy-zoom-control.h"
  28 #include "ephy-zoom.h"
  29
  30 #include <glib-object.h>
  31 #include <glib/gi18n.h>
  32 #include <gtk/gtkmenu.h>
  33 #include <gtk/gtkmenuitem.h>
  34 #include <gtk/gtkcheckmenuitem.h>
  35 #include <gtk/gtkradiomenuitem.h>
  36 #include <gtk/gtkseparatormenuitem.h>
  37
  38 #define EPHY_ZOOM_ACTION_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_ZOOM_ACTION, EphyZoomActionPrivate))
  39
  40 struct _EphyZoomActionPrivate
  41 {
  42         float zoom;
  43 };
  44
  45 enum
  46 {
  47         PROP_0,
  48         PROP_ZOOM
  49 };
  50
  51
  52 static void ephy_zoom_action_init       (EphyZoomAction *action);
  53 static void ephy_zoom_action_class_init (EphyZoomActionClass *class);
  54
  55 enum
  56 {
  57         ZOOM_TO_LEVEL_SIGNAL,
  58         LAST_SIGNAL
  59 };
  60
  61 static guint signals[LAST_SIGNAL] = { 0 };
  62
  63 static GObjectClass *parent_class = NULL;
  64
  65 GType
  66 ephy_zoom_action_get_type (void)
  67 {
  68         static GType type = 0;
  69
  70         if (G_UNLIKELY (type == 0))
  71         {
  72                 const GTypeInfo our_info =
  73                         {
  74                                 sizeof (EphyZoomActionClass),
  75                                 NULL, /* base_init */
  76                                 NULL, /* base_finalize */
  77                                 (GClassInitFunc) ephy_zoom_action_class_init,
  78                                 NULL,
  79                                 NULL, /* class_data */
  80                                 sizeof (EphyZoomAction),
  81                                 0, /* n_preallocs */
  82                                 (GInstanceInitFunc) ephy_zoom_action_init,
  83                         };
  84
  85                 type = g_type_register_static (GTK_TYPE_ACTION,
  86                                                "EphyZoomAction",
  87                                                &our_info, 0);
  88         }
  89
  90         return type;
  91 }
  92
  93 static void
  94 zoom_to_level_cb (EphyZoomControl *control,
  95                   float zoom,
  96                   EphyZoomAction *action)
  97 {
  98         g_signal_emit (action, signals[ZOOM_TO_LEVEL_SIGNAL], 0, zoom);
  99 }
 100
 101 static void
 102 sync_zoom_cb (GtkAction *action, GParamSpec *pspec, GtkWidget *proxy)
 103 {
 104         EphyZoomAction *zoom_action = EPHY_ZOOM_ACTION (action);
 105
 106         g_object_set (G_OBJECT (proxy), "zoom", zoom_action->priv->zoom, NULL);
 107 }
 108
 109 static void
 110 connect_proxy (GtkAction *action, GtkWidget *proxy)
 111 {
 112         if (EPHY_IS_ZOOM_CONTROL (proxy))
 113         {
 114                 g_signal_connect_object (action, "notify::zoom",
 115                                          G_CALLBACK (sync_zoom_cb), proxy, 0);
 116
 117                 g_signal_connect (proxy, "zoom_to_level",
 118                                   G_CALLBACK (zoom_to_level_cb), action);
 119         }
 120
 121         GTK_ACTION_CLASS (parent_class)->connect_proxy (action, proxy);
 122 }
 123
 124 static void
 125 proxy_menu_activate_cb (GtkMenuItem *menu_item, EphyZoomAction *action)
 126 {
 127         gint index;
 128         float zoom;
 129
 130         /* menu item was toggled OFF */
 131         if (!gtk_check_menu_item_get_active (GTK_CHECK_MENU_ITEM (menu_item))) return;
 132
 133         index = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (menu_item), "zoom-level"));
 134         zoom = zoom_levels[index].level;
 135
 136         if (zoom != action->priv->zoom)
 137         {
 138                 g_signal_emit (action, signals[ZOOM_TO_LEVEL_SIGNAL], 0, zoom);
 139         }
 140 }
 141
 142 static GtkWidget *
 143 create_menu_item (GtkAction *action)
 144 {
 145         EphyZoomActionPrivate *p = EPHY_ZOOM_ACTION (action)->priv;
 146         GtkWidget *menu, *menu_item;
 147         GSList *group = NULL;
 148         int i;
 149
 150         menu = gtk_menu_new ();
 151
 152         for (i = 0; i < n_zoom_levels; i++)
 153         {
 154                 if (zoom_levels[i].level == EPHY_ZOOM_SEPARATOR)
 155                 {
 156                         menu_item = gtk_separator_menu_item_new ();
 157                 }
 158                 else
 159                 {
 160                         menu_item = gtk_radio_menu_item_new_with_label (group,
 161                                                                         zoom_levels[i].name);
 162                         group = gtk_radio_menu_item_get_group (GTK_RADIO_MENU_ITEM (menu_item));
 163
 164                         gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (menu_item),
 165                                                         p->zoom == zoom_levels[i].level);
 166
 167                         g_object_set_data (G_OBJECT (menu_item), "zoom-level", GINT_TO_POINTER (i));
 168                         g_signal_connect_object (G_OBJECT (menu_item), "activate",
 169                                                 G_CALLBACK (proxy_menu_activate_cb), action, 0);
 170                 }
 171
 172                 gtk_widget_show (menu_item);
 173                 gtk_menu_shell_append (GTK_MENU_SHELL (menu), menu_item);
 174         }
 175
 176         gtk_widget_show (menu);
 177
 178         menu_item = GTK_ACTION_CLASS (parent_class)->create_menu_item (action);
 179
 180         gtk_menu_item_set_submenu (GTK_MENU_ITEM (menu_item), menu);
 181
 182         gtk_widget_show (menu_item);
 183
 184         return menu_item;
 185 }
 186
 187 static void
 188 ephy_zoom_action_set_property (GObject *object,
 189                                guint prop_id,
 190                                const GValue *value,
 191                                GParamSpec *pspec)
 192 {
 193         EphyZoomAction *action;
 194
 195         action = EPHY_ZOOM_ACTION (object);
 196
 197         switch (prop_id)
 198         {
 199                 case PROP_ZOOM:
 200                         action->priv->zoom = g_value_get_float (value);
 201                         break;
 202         }
 203 }
 204
 205 static void
 206 ephy_zoom_action_get_property (GObject *object,
 207                                guint prop_id,
 208                                GValue *value,
 209                                GParamSpec *pspec)
 210 {
 211         EphyZoomAction *action;
 212
 213         action = EPHY_ZOOM_ACTION (object);
 214
 215         switch (prop_id)
 216         {
 217                 case PROP_ZOOM:
 218                         g_value_set_float (value, action->priv->zoom);
 219                         break;
 220         }
 221 }
 222
 223 static void
 224 ephy_zoom_action_class_init (EphyZoomActionClass *class)
 225 {
 226         GObjectClass *object_class = G_OBJECT_CLASS (class);
 227         GtkActionClass *action_class = GTK_ACTION_CLASS (class);
 228
 229         object_class->set_property = ephy_zoom_action_set_property;
 230         object_class->get_property = ephy_zoom_action_get_property;
 231
 232         parent_class = g_type_class_peek_parent (class);
 233
 234         action_class->toolbar_item_type = EPHY_TYPE_ZOOM_CONTROL;
 235         action_class->connect_proxy = connect_proxy;
 236         action_class->create_menu_item = create_menu_item;
 237
 238         g_object_class_install_property (object_class,
 239                                          PROP_ZOOM,
 240                                          g_param_spec_float ("zoom",
 241                                                              "Zoom",
 242                                                              "Zoom",
 243                                                              ZOOM_MINIMAL,
 244                                                              ZOOM_MAXIMAL,
 245                                                              1.0,
 246                                                              G_PARAM_READWRITE));
 247
 248         signals[ZOOM_TO_LEVEL_SIGNAL] =
 249                 g_signal_new ("zoom_to_level",
 250                               G_OBJECT_CLASS_TYPE (object_class),
 251                               G_SIGNAL_RUN_FIRST,
 252                               G_STRUCT_OFFSET (EphyZoomActionClass, zoom_to_level),
 253                               NULL, NULL,
 254                               g_cclosure_marshal_VOID__FLOAT,
 255                               G_TYPE_NONE,
 256                               1,
 257                               G_TYPE_FLOAT);
 258
 259         g_type_class_add_private (object_class, sizeof (EphyZoomActionPrivate));
 260 }
 261
 262 static void
 263 ephy_zoom_action_init (EphyZoomAction *action)
 264 {
 265         action->priv = EPHY_ZOOM_ACTION_GET_PRIVATE (action);
 266
 267         action->priv->zoom = 1.0;
 268 }
 269
 270 void
 271 ephy_zoom_action_set_zoom_level (EphyZoomAction *action, float zoom)
 272 {
 273         g_return_if_fail (EPHY_IS_ZOOM_ACTION (action));
 274
 275         if (zoom < ZOOM_MINIMAL || zoom > ZOOM_MAXIMAL) return;
 276
 277         action->priv->zoom = zoom;
 278         g_object_notify (G_OBJECT (action), "zoom");
 279 }
 280
 281 float
 282 ephy_zoom_action_get_zoom_level (EphyZoomAction *action)
 283 {
 284         g_return_val_if_fail (EPHY_IS_ZOOM_ACTION (action), 1.0);
 285
 286         return action->priv->zoom;
 287 }