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

   1 /*
   2  *  Copyright (C) 2003, 2004 Christian Persch
   3  *
   4  *  Modified 2005 by James Bowes for use in evince.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2, or (at your option)
   9  *  any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  *
  20  *  $Id$
  21  */
  22
  23 #include "config.h"
  24
  25 #include "ephy-zoom-control.h"
  26 #include "ephy-zoom.h"
  27
  28 #include <gtk/gtk.h>
  29 #include <glib/gi18n.h>
  30
  31 #define EPHY_ZOOM_CONTROL_GET_PRIVATE(object)\
  32         (G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_ZOOM_CONTROL, EphyZoomControlPrivate))
  33
  34 struct _EphyZoomControlPrivate
  35 {
  36         GtkComboBox *combo;
  37         float zoom;
  38         guint handler_id;
  39 };
  40
  41 enum
  42 {
  43         COL_TEXT,
  44         COL_IS_SEP
  45 };
  46
  47 enum
  48 {
  49         PROP_0,
  50         PROP_ZOOM
  51 };
  52
  53 enum
  54 {
  55         ZOOM_TO_LEVEL_SIGNAL,
  56         LAST_SIGNAL
  57 };
  58
  59 static guint signals[LAST_SIGNAL];
  60
  61 G_DEFINE_TYPE (EphyZoomControl, ephy_zoom_control, GTK_TYPE_TOOL_ITEM)
  62
  63 static void
  64 combo_changed_cb (GtkComboBox *combo, EphyZoomControl *control)
  65 {
  66         gint index;
  67         float zoom;
  68
  69         index = gtk_combo_box_get_active (combo);
  70         zoom = zoom_levels[index].level;
  71
  72         if (zoom != control->priv->zoom)
  73         {
  74                 g_signal_emit (control, signals[ZOOM_TO_LEVEL_SIGNAL], 0, zoom);
  75         }
  76 }
  77
  78 static void
  79 sync_zoom_cb (EphyZoomControl *control, GParamSpec *pspec, gpointer data)
  80 {
  81         EphyZoomControlPrivate *p = control->priv;
  82         guint index;
  83
  84         index = ephy_zoom_get_zoom_level_index (p->zoom);
  85
  86         g_signal_handler_block (p->combo, p->handler_id);
  87         gtk_combo_box_set_active (p->combo, index);
  88         g_signal_handler_unblock (p->combo, p->handler_id);
  89 }
  90
  91 static gboolean
  92 row_is_separator (GtkTreeModel *model,
  93                   GtkTreeIter  *iter,
  94                   gpointer      data)
  95 {
  96         gboolean is_sep;
  97         gtk_tree_model_get (model, iter, COL_IS_SEP, &is_sep, -1);
  98         return is_sep;
  99 }
 100
 101 static void
 102 ephy_zoom_control_finalize (GObject *o)
 103 {
 104         EphyZoomControl *control = EPHY_ZOOM_CONTROL (o);
 105
 106         g_object_unref (control->priv->combo);
 107
 108         G_OBJECT_CLASS (ephy_zoom_control_parent_class)->finalize (o);
 109 }
 110
 111 static void
 112 ephy_zoom_control_init (EphyZoomControl *control)
 113 {
 114         EphyZoomControlPrivate *p;
 115         GtkWidget *vbox;
 116         GtkCellRenderer *renderer;
 117         GtkListStore    *store;
 118         GtkTreeIter      iter;
 119         guint i;
 120
 121         p = EPHY_ZOOM_CONTROL_GET_PRIVATE (control);
 122         control->priv = p;
 123
 124         p->zoom = 1.0;
 125
 126         store = gtk_list_store_new (2, G_TYPE_STRING, G_TYPE_BOOLEAN);
 127
 128         for (i = 0; i < n_zoom_levels; i++)
 129         {
 130                 gtk_list_store_append (store, &iter);
 131
 132                 if (zoom_levels[i].name != NULL) {
 133                         gtk_list_store_set (store, &iter,
 134                                             COL_TEXT, _(zoom_levels[i].name),
 135                                             -1);
 136                 } else {
 137                         gtk_list_store_set (store, &iter,
 138                                             COL_IS_SEP, zoom_levels[i].name == NULL,
 139                                             -1);
 140                 }
 141         }
 142
 143         p->combo = GTK_COMBO_BOX (gtk_combo_box_new_with_model (GTK_TREE_MODEL (store)));
 144         g_object_unref (store);
 145
 146         renderer = gtk_cell_renderer_text_new ();
 147         gtk_cell_layout_pack_start     (GTK_CELL_LAYOUT (p->combo), renderer, TRUE);
 148         gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (p->combo), renderer,
 149                                         "text", COL_TEXT, NULL);
 150         gtk_combo_box_set_row_separator_func (p->combo,
 151                                               (GtkTreeViewRowSeparatorFunc) row_is_separator,
 152                                               NULL, NULL);
 153
 154         gtk_combo_box_set_focus_on_click (p->combo, FALSE);
 155         g_object_ref_sink (G_OBJECT (p->combo));
 156         gtk_widget_show (GTK_WIDGET (p->combo));
 157
 158         i = ephy_zoom_get_zoom_level_index (p->zoom);
 159         gtk_combo_box_set_active (p->combo, i);
 160
 161         vbox = gtk_vbox_new (TRUE, 0);
 162         gtk_box_pack_start (GTK_BOX (vbox), GTK_WIDGET (p->combo), TRUE, FALSE, 0);
 163         gtk_widget_show (vbox);
 164
 165         gtk_container_add (GTK_CONTAINER (control), vbox);
 166
 167         p->handler_id = g_signal_connect (p->combo, "changed",
 168                                           G_CALLBACK (combo_changed_cb), control);
 169
 170         g_signal_connect_object (control, "notify::zoom",
 171                                  G_CALLBACK (sync_zoom_cb), NULL, 0);
 172 }
 173
 174 static void
 175 ephy_zoom_control_set_property (GObject *object,
 176                                 guint prop_id,
 177                                 const GValue *value,
 178                                 GParamSpec *pspec)
 179 {
 180         EphyZoomControl *control;
 181         EphyZoomControlPrivate *p;
 182
 183         control = EPHY_ZOOM_CONTROL (object);
 184         p = control->priv;
 185
 186         switch (prop_id)
 187         {
 188                 case PROP_ZOOM:
 189                         p->zoom = g_value_get_float (value);
 190                         break;
 191         }
 192 }
 193
 194 static void
 195 ephy_zoom_control_get_property (GObject *object,
 196                                 guint prop_id,
 197                                 GValue *value,
 198                                 GParamSpec *pspec)
 199 {
 200         EphyZoomControl *control;
 201         EphyZoomControlPrivate *p;
 202
 203         control = EPHY_ZOOM_CONTROL (object);
 204         p = control->priv;
 205
 206         switch (prop_id)
 207         {
 208                 case PROP_ZOOM:
 209                         g_value_set_float (value, p->zoom);
 210                         break;
 211         }
 212 }
 213
 214 static void
 215 ephy_zoom_control_class_init (EphyZoomControlClass *klass)
 216 {
 217         GObjectClass *object_class;
 218         GtkToolItemClass *tool_item_class;
 219
 220         object_class = (GObjectClass *)klass;
 221         tool_item_class = (GtkToolItemClass *)klass;
 222
 223         object_class->set_property = ephy_zoom_control_set_property;
 224         object_class->get_property = ephy_zoom_control_get_property;
 225         object_class->finalize = ephy_zoom_control_finalize;
 226
 227         g_object_class_install_property (object_class,
 228                                          PROP_ZOOM,
 229                                          g_param_spec_float ("zoom",
 230                                                              "Zoom",
 231                                                              "Zoom level to display in the item.",
 232                                                              ZOOM_MINIMAL,
 233                                                              ZOOM_MAXIMAL,
 234                                                              1.0,
 235                                                              G_PARAM_READWRITE));
 236
 237         signals[ZOOM_TO_LEVEL_SIGNAL] =
 238                 g_signal_new ("zoom_to_level",
 239                               G_TYPE_FROM_CLASS (klass),
 240                               G_SIGNAL_RUN_LAST,
 241                               G_STRUCT_OFFSET (EphyZoomControlClass,
 242                                                zoom_to_level),
 243                               NULL, NULL,
 244                               g_cclosure_marshal_VOID__FLOAT,
 245                               G_TYPE_NONE,
 246                               1,
 247                               G_TYPE_FLOAT);
 248
 249         g_type_class_add_private (object_class, sizeof (EphyZoomControlPrivate));
 250 }
 251
 252 void
 253 ephy_zoom_control_set_zoom_level (EphyZoomControl *control, float zoom)
 254 {
 255         g_return_if_fail (EPHY_IS_ZOOM_CONTROL (control));
 256
 257         if (zoom < ZOOM_MINIMAL || zoom > ZOOM_MAXIMAL) return;
 258
 259         control->priv->zoom = zoom;
 260         g_object_notify (G_OBJECT (control), "zoom");
 261 }
 262
 263 float
 264 ephy_zoom_control_get_zoom_level (EphyZoomControl *control)
 265 {
 266         g_return_val_if_fail (EPHY_IS_ZOOM_CONTROL (control), 1.0);
 267
 268         return control->priv->zoom;
 269 }