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/gtk.h>
  33
  34 #define EPHY_ZOOM_ACTION_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_ZOOM_ACTION, EphyZoomActionPrivate))
  35
  36 struct _EphyZoomActionPrivate
  37 {
  38         float zoom;
  39 };
  40
  41 enum
  42 {
  43         PROP_0,
  44         PROP_ZOOM
  45 };
  46
  47
  48 static void ephy_zoom_action_init       (EphyZoomAction *action);
  49 static void ephy_zoom_action_class_init (EphyZoomActionClass *class);
  50
  51 enum
  52 {
  53         ZOOM_TO_LEVEL_SIGNAL,
  54         LAST_SIGNAL
  55 };
  56
  57 static guint signals[LAST_SIGNAL] = { 0 };
  58
  59 static GObjectClass *parent_class = NULL;
  60
  61 GType
  62 ephy_zoom_action_get_type (void)
  63 {
  64         static GType type = 0;
  65
  66         if (G_UNLIKELY (type == 0))
  67         {
  68                 const GTypeInfo our_info =
  69                         {
  70                                 sizeof (EphyZoomActionClass),
  71                                 NULL, /* base_init */
  72                                 NULL, /* base_finalize */
  73                                 (GClassInitFunc) ephy_zoom_action_class_init,
  74                                 NULL,
  75                                 NULL, /* class_data */
  76                                 sizeof (EphyZoomAction),
  77                                 0, /* n_preallocs */
  78                                 (GInstanceInitFunc) ephy_zoom_action_init,
  79                         };
  80
  81                 type = g_type_register_static (GTK_TYPE_ACTION,
  82                                                "EphyZoomAction",
  83                                                &our_info, 0);
  84         }
  85
  86         return type;
  87 }
  88
  89 static void
  90 zoom_to_level_cb (EphyZoomControl *control,
  91                   float zoom,
  92                   EphyZoomAction *action)
  93 {
  94         g_signal_emit (action, signals[ZOOM_TO_LEVEL_SIGNAL], 0, zoom);
  95 }
  96
  97 static void
  98 sync_zoom_cb (GtkAction *action, GParamSpec *pspec, GtkWidget *proxy)
  99 {
 100         EphyZoomAction *zoom_action = EPHY_ZOOM_ACTION (action);
 101
 102         g_object_set (G_OBJECT (proxy), "zoom", zoom_action->priv->zoom, NULL);
 103 }
 104
 105 static void
 106 connect_proxy (GtkAction *action, GtkWidget *proxy)
 107 {
 108         if (EPHY_IS_ZOOM_CONTROL (proxy))
 109         {
 110                 g_signal_connect_object (action, "notify::zoom",
 111                                          G_CALLBACK (sync_zoom_cb), proxy, 0);
 112
 113                 g_signal_connect (proxy, "zoom_to_level",
 114                                   G_CALLBACK (zoom_to_level_cb), action);
 115         }
 116
 117         GTK_ACTION_CLASS (parent_class)->connect_proxy (action, proxy);
 118 }
 119
 120 static void
 121 proxy_menu_activate_cb (GtkMenuItem *menu_item, EphyZoomAction *action)
 122 {
 123         gint index;
 124         float zoom;
 125
 126         /* menu item was toggled OFF */
 127         if (!gtk_check_menu_item_get_active (GTK_CHECK_MENU_ITEM (menu_item))) return;
 128
 129         index = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (menu_item), "zoom-level"));
 130         zoom = zoom_levels[index].level;
 131
 132         if (zoom != action->priv->zoom)
 133         {
 134                 g_signal_emit (action, signals[ZOOM_TO_LEVEL_SIGNAL], 0, zoom);
 135         }
 136 }
 137
 138 static GtkWidget *
 139 create_menu_item (GtkAction *action)
 140 {
 141         EphyZoomActionPrivate *p = EPHY_ZOOM_ACTION (action)->priv;
 142         GtkWidget *menu, *menu_item;
 143         GSList *group = NULL;
 144         int i;
 145
 146         menu = gtk_menu_new ();
 147
 148         for (i = 0; i < n_zoom_levels; i++)
 149         {
 150                 if (zoom_levels[i].level == EPHY_ZOOM_SEPARATOR)
 151                 {
 152                         menu_item = gtk_separator_menu_item_new ();
 153                 }
 154                 else
 155                 {
 156                         menu_item = gtk_radio_menu_item_new_with_label (group,
 157                                                                         zoom_levels[i].name);
 158                         group = gtk_radio_menu_item_get_group (GTK_RADIO_MENU_ITEM (menu_item));
 159
 160                         gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (menu_item),
 161                                                         p->zoom == zoom_levels[i].level);
 162
 163                         g_object_set_data (G_OBJECT (menu_item), "zoom-level", GINT_TO_POINTER (i));
 164                         g_signal_connect_object (G_OBJECT (menu_item), "activate",
 165                                                 G_CALLBACK (proxy_menu_activate_cb), action, 0);
 166                 }
 167
 168                 gtk_widget_show (menu_item);
 169                 gtk_menu_shell_append (GTK_MENU_SHELL (menu), menu_item);
 170         }
 171
 172         gtk_widget_show (menu);
 173
 174         menu_item = GTK_ACTION_CLASS (parent_class)->create_menu_item (action);
 175
 176         gtk_menu_item_set_submenu (GTK_MENU_ITEM (menu_item), menu);
 177
 178         gtk_widget_show (menu_item);
 179
 180         return menu_item;
 181 }
 182
 183 static void
 184 ephy_zoom_action_set_property (GObject *object,
 185                                guint prop_id,
 186                                const GValue *value,
 187                                GParamSpec *pspec)
 188 {
 189         EphyZoomAction *action;
 190
 191         action = EPHY_ZOOM_ACTION (object);
 192
 193         switch (prop_id)
 194         {
 195                 case PROP_ZOOM:
 196                         action->priv->zoom = g_value_get_float (value);
 197                         break;
 198         }
 199 }
 200
 201 static void
 202 ephy_zoom_action_get_property (GObject *object,
 203                                guint prop_id,
 204                                GValue *value,
 205                                GParamSpec *pspec)
 206 {
 207         EphyZoomAction *action;
 208
 209         action = EPHY_ZOOM_ACTION (object);
 210
 211         switch (prop_id)
 212         {
 213                 case PROP_ZOOM:
 214                         g_value_set_float (value, action->priv->zoom);
 215                         break;
 216         }
 217 }
 218
 219 static void
 220 ephy_zoom_action_class_init (EphyZoomActionClass *class)
 221 {
 222         GObjectClass *object_class = G_OBJECT_CLASS (class);
 223         GtkActionClass *action_class = GTK_ACTION_CLASS (class);
 224
 225         object_class->set_property = ephy_zoom_action_set_property;
 226         object_class->get_property = ephy_zoom_action_get_property;
 227
 228         parent_class = g_type_class_peek_parent (class);
 229
 230         action_class->toolbar_item_type = EPHY_TYPE_ZOOM_CONTROL;
 231         action_class->connect_proxy = connect_proxy;
 232         action_class->create_menu_item = create_menu_item;
 233
 234         g_object_class_install_property (object_class,
 235                                          PROP_ZOOM,
 236                                          g_param_spec_float ("zoom",
 237                                                              "Zoom",
 238                                                              "Zoom",
 239                                                              ZOOM_MINIMAL,
 240                                                              ZOOM_MAXIMAL,
 241                                                              1.0,
 242                                                              G_PARAM_READWRITE));
 243
 244         signals[ZOOM_TO_LEVEL_SIGNAL] =
 245                 g_signal_new ("zoom_to_level",
 246                               G_OBJECT_CLASS_TYPE (object_class),
 247                               G_SIGNAL_RUN_FIRST,
 248                               G_STRUCT_OFFSET (EphyZoomActionClass, zoom_to_level),
 249                               NULL, NULL,
 250                               g_cclosure_marshal_VOID__FLOAT,
 251                               G_TYPE_NONE,
 252                               1,
 253                               G_TYPE_FLOAT);
 254
 255         g_type_class_add_private (object_class, sizeof (EphyZoomActionPrivate));
 256 }
 257
 258 static void
 259 ephy_zoom_action_init (EphyZoomAction *action)
 260 {
 261         action->priv = EPHY_ZOOM_ACTION_GET_PRIVATE (action);
 262
 263         action->priv->zoom = 1.0;
 264 }
 265
 266 void
 267 ephy_zoom_action_set_zoom_level (EphyZoomAction *action, float zoom)
 268 {
 269         g_return_if_fail (EPHY_IS_ZOOM_ACTION (action));
 270
 271         if (zoom < ZOOM_MINIMAL || zoom > ZOOM_MAXIMAL) return;
 272
 273         action->priv->zoom = zoom;
 274         g_object_notify (G_OBJECT (action), "zoom");
 275 }
 276
 277 float
 278 ephy_zoom_action_get_zoom_level (EphyZoomAction *action)
 279 {
 280         g_return_val_if_fail (EPHY_IS_ZOOM_ACTION (action), 1.0);
 281
 282         return action->priv->zoom;
 283 }