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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 <gtk/gtkcombobox.h>
  30 #include <gtk/gtktooltips.h>
  31 #include <glib/gi18n.h>
  32
  33 #define EPHY_ZOOM_CONTROL_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_ZOOM_CONTROL, EphyZoomControlPrivate))
  34
  35 struct _EphyZoomControlPrivate
  36 {
  37         GtkComboBox *combo;
  38         float zoom;
  39         guint handler_id;
  40 };
  41
  42 enum
  43 {
  44         COL_TEXT,
  45         COL_IS_SEP
  46 };
  47
  48 enum
  49 {
  50         PROP_0,
  51         PROP_ZOOM
  52 };
  53
  54 enum
  55 {
  56         ZOOM_TO_LEVEL_SIGNAL,
  57         LAST_SIGNAL
  58 };
  59
  60 static guint signals[LAST_SIGNAL];
  61
  62 static GObjectClass *parent_class = NULL;
  63
  64 static void     ephy_zoom_control_class_init    (EphyZoomControlClass *klass);
  65 static void     ephy_zoom_control_init          (EphyZoomControl *control);
  66 static void     ephy_zoom_control_finalize      (GObject *o);
  67
  68 GType
  69 ephy_zoom_control_get_type (void)
  70 {
  71         static GType type = 0;
  72
  73         if (G_UNLIKELY (type == 0))
  74         {
  75                 const GTypeInfo our_info =
  76                         {
  77                                 sizeof (EphyZoomControlClass),
  78                                 NULL, /* base_init */
  79                                 NULL, /* base_finalize */
  80                                 (GClassInitFunc) ephy_zoom_control_class_init,
  81                                 NULL,
  82                                 NULL, /* class_data */
  83                                 sizeof (EphyZoomControl),
  84                                 0, /* n_preallocs */
  85                                 (GInstanceInitFunc) ephy_zoom_control_init,
  86                         };
  87
  88                 type = g_type_register_static (GTK_TYPE_TOOL_ITEM,
  89                                                "EphyZoomControl",
  90                                                &our_info, 0);
  91         }
  92
  93         return type;
  94 }
  95
  96 static void
  97 combo_changed_cb (GtkComboBox *combo, EphyZoomControl *control)
  98 {
  99         gint index;
 100         float zoom;
 101
 102         index = gtk_combo_box_get_active (combo);
 103         zoom = zoom_levels[index].level;
 104
 105         if (zoom != control->priv->zoom)
 106         {
 107                 g_signal_emit (control, signals[ZOOM_TO_LEVEL_SIGNAL], 0, zoom);
 108         }
 109 }
 110
 111 static void
 112 sync_zoom_cb (EphyZoomControl *control, GParamSpec *pspec, gpointer data)
 113 {
 114         EphyZoomControlPrivate *p = control->priv;
 115         guint index;
 116
 117         index = ephy_zoom_get_zoom_level_index (p->zoom);
 118
 119         g_signal_handler_block (p->combo, p->handler_id);
 120         gtk_combo_box_set_active (p->combo, index);
 121         g_signal_handler_unblock (p->combo, p->handler_id);
 122 }
 123
 124 static gboolean
 125 row_is_separator (GtkTreeModel *model,
 126                   GtkTreeIter  *iter,
 127                   gpointer      data)
 128 {
 129         gboolean is_sep;
 130         gtk_tree_model_get (model, iter, COL_IS_SEP, &is_sep, -1);
 131         return is_sep;
 132 }
 133
 134 static void
 135 ephy_zoom_control_init (EphyZoomControl *control)
 136 {
 137         EphyZoomControlPrivate *p;
 138         GtkWidget *vbox;
 139         GtkCellRenderer *renderer;
 140         GtkListStore    *store;
 141         GtkTreeIter      iter;
 142         guint i;
 143
 144         p = EPHY_ZOOM_CONTROL_GET_PRIVATE (control);
 145         control->priv = p;
 146
 147         p->zoom = 1.0;
 148
 149         store = gtk_list_store_new (2, G_TYPE_STRING, G_TYPE_BOOLEAN);
 150
 151         for (i = 0; i < n_zoom_levels; i++)
 152         {
 153                 gtk_list_store_append (store, &iter);
 154
 155                 if (zoom_levels[i].name != NULL) {
 156                         gtk_list_store_set (store, &iter,
 157                                             COL_TEXT, _(zoom_levels[i].name),
 158                                             -1);
 159                 } else {
 160                         gtk_list_store_set (store, &iter,
 161                                             COL_IS_SEP, zoom_levels[i].name == NULL,
 162                                             -1);
 163                 }
 164         }
 165
 166         p->combo = GTK_COMBO_BOX (gtk_combo_box_new_with_model (GTK_TREE_MODEL (store)));
 167         g_object_unref (store);
 168
 169         renderer = gtk_cell_renderer_text_new ();
 170         gtk_cell_layout_pack_start     (GTK_CELL_LAYOUT (p->combo), renderer, TRUE);
 171         gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (p->combo), renderer,
 172                                         "text", COL_TEXT, NULL);
 173         gtk_combo_box_set_row_separator_func (p->combo,
 174                                               (GtkTreeViewRowSeparatorFunc) row_is_separator,
 175                                               NULL, NULL);
 176
 177         gtk_combo_box_set_focus_on_click (p->combo, FALSE);
 178         g_object_ref (p->combo);
 179         gtk_object_sink (GTK_OBJECT (p->combo));
 180         gtk_widget_show (GTK_WIDGET (p->combo));
 181
 182         i = ephy_zoom_get_zoom_level_index (p->zoom);
 183         gtk_combo_box_set_active (p->combo, i);
 184
 185         vbox = gtk_vbox_new (TRUE, 0);
 186         gtk_box_pack_start (GTK_BOX (vbox), GTK_WIDGET (p->combo), TRUE, FALSE, 0);
 187         gtk_widget_show (vbox);
 188
 189         gtk_container_add (GTK_CONTAINER (control), vbox);
 190
 191         p->handler_id = g_signal_connect (p->combo, "changed",
 192                                           G_CALLBACK (combo_changed_cb), control);
 193
 194         g_signal_connect_object (control, "notify::zoom",
 195                                  G_CALLBACK (sync_zoom_cb), NULL, 0);
 196 }
 197
 198 static void
 199 ephy_zoom_control_set_property (GObject *object,
 200                                 guint prop_id,
 201                                 const GValue *value,
 202                                 GParamSpec *pspec)
 203 {
 204         EphyZoomControl *control;
 205         EphyZoomControlPrivate *p;
 206
 207         control = EPHY_ZOOM_CONTROL (object);
 208         p = control->priv;
 209
 210         switch (prop_id)
 211         {
 212                 case PROP_ZOOM:
 213                         p->zoom = g_value_get_float (value);
 214                         break;
 215         }
 216 }
 217
 218 static void
 219 ephy_zoom_control_get_property (GObject *object,
 220                                 guint prop_id,
 221                                 GValue *value,
 222                                 GParamSpec *pspec)
 223 {
 224         EphyZoomControl *control;
 225         EphyZoomControlPrivate *p;
 226
 227         control = EPHY_ZOOM_CONTROL (object);
 228         p = control->priv;
 229
 230         switch (prop_id)
 231         {
 232                 case PROP_ZOOM:
 233                         g_value_set_float (value, p->zoom);
 234                         break;
 235         }
 236 }
 237
 238 static void
 239 set_combo_tooltip (GtkWidget *widget,
 240                    GtkTooltipsData *data)
 241 {
 242         if (GTK_IS_BUTTON (widget))
 243         {
 244                 gtk_tooltips_set_tip (data->tooltips, widget,
 245                                       data->tip_text, data->tip_private);
 246         }
 247 }
 248
 249 static void
 250 combo_realized (GtkWidget *combo,
 251                 GtkWidget *control)
 252 {
 253         GtkTooltipsData *data;
 254
 255         data = gtk_tooltips_data_get (control);
 256         g_return_if_fail (data != NULL);
 257
 258         gtk_container_forall (GTK_CONTAINER (combo),
 259                               (GtkCallback) set_combo_tooltip, data);
 260 }
 261
 262 static gboolean
 263 ephy_zoom_control_set_tooltip (GtkToolItem *tool_item,
 264                                GtkTooltips *tooltips,
 265                                const char *tip_text,
 266                                const char *tip_private)
 267 {
 268         EphyZoomControl *control = EPHY_ZOOM_CONTROL (tool_item);
 269         GtkWidget *widget = GTK_WIDGET (tool_item);
 270
 271         /* hack to make tooltips work also on Ctrl-F1 */
 272         gtk_tooltips_set_tip (tooltips, widget, tip_text, tip_private);
 273
 274         g_signal_handlers_disconnect_by_func
 275                 (control->priv->combo, G_CALLBACK (combo_realized), widget);
 276
 277         if (GTK_WIDGET_REALIZED (tool_item))
 278         {
 279                 combo_realized (GTK_WIDGET (control->priv->combo), widget);
 280         }
 281         else
 282         {
 283                 g_signal_connect_after (control->priv->combo, "realize",
 284                                         G_CALLBACK (combo_realized), widget);
 285         }
 286
 287         return TRUE;
 288 }
 289
 290 static void
 291 ephy_zoom_control_class_init (EphyZoomControlClass *klass)
 292 {
 293         GObjectClass *object_class;
 294         GtkToolItemClass *tool_item_class;
 295
 296         parent_class = g_type_class_peek_parent (klass);
 297
 298         object_class = (GObjectClass *)klass;
 299         tool_item_class = (GtkToolItemClass *)klass;
 300
 301         object_class->set_property = ephy_zoom_control_set_property;
 302         object_class->get_property = ephy_zoom_control_get_property;
 303         object_class->finalize = ephy_zoom_control_finalize;
 304
 305         tool_item_class->set_tooltip = ephy_zoom_control_set_tooltip;
 306
 307         g_object_class_install_property (object_class,
 308                                          PROP_ZOOM,
 309                                          g_param_spec_float ("zoom",
 310                                                              "Zoom",
 311                                                              "Zoom level to display in the item.",
 312                                                              ZOOM_MINIMAL,
 313                                                              ZOOM_MAXIMAL,
 314                                                              1.0,
 315                                                              G_PARAM_READWRITE));
 316
 317         signals[ZOOM_TO_LEVEL_SIGNAL] =
 318                 g_signal_new ("zoom_to_level",
 319                               G_TYPE_FROM_CLASS (klass),
 320                               G_SIGNAL_RUN_LAST,
 321                               G_STRUCT_OFFSET (EphyZoomControlClass,
 322                                                zoom_to_level),
 323                               NULL, NULL,
 324                               g_cclosure_marshal_VOID__FLOAT,
 325                               G_TYPE_NONE,
 326                               1,
 327                               G_TYPE_FLOAT);
 328
 329         g_type_class_add_private (object_class, sizeof (EphyZoomControlPrivate));
 330 }
 331
 332 static void
 333 ephy_zoom_control_finalize (GObject *o)
 334 {
 335         EphyZoomControl *control = EPHY_ZOOM_CONTROL (o);
 336
 337         g_object_unref (control->priv->combo);
 338
 339         G_OBJECT_CLASS (parent_class)->finalize (o);
 340 }
 341
 342 void
 343 ephy_zoom_control_set_zoom_level (EphyZoomControl *control, float zoom)
 344 {
 345         g_return_if_fail (EPHY_IS_ZOOM_CONTROL (control));
 346
 347         if (zoom < ZOOM_MINIMAL || zoom > ZOOM_MAXIMAL) return;
 348
 349         control->priv->zoom = zoom;
 350         g_object_notify (G_OBJECT (control), "zoom");
 351 }
 352
 353 float
 354 ephy_zoom_control_get_zoom_level (EphyZoomControl *control)
 355 {
 356         g_return_val_if_fail (EPHY_IS_ZOOM_CONTROL (control), 1.0);
 357
 358         return control->priv->zoom;
 359 }