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 #if !GTK_CHECK_VERSION (2, 11, 5)
  31 #include <gtk/gtktooltips.h>
  32 #endif
  33 #include <glib/gi18n.h>
  34
  35 #define EPHY_ZOOM_CONTROL_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_ZOOM_CONTROL, EphyZoomControlPrivate))
  36
  37 struct _EphyZoomControlPrivate
  38 {
  39         GtkComboBox *combo;
  40         float zoom;
  41         guint handler_id;
  42 };
  43
  44 enum
  45 {
  46         COL_TEXT,
  47         COL_IS_SEP
  48 };
  49
  50 enum
  51 {
  52         PROP_0,
  53         PROP_ZOOM
  54 };
  55
  56 enum
  57 {
  58         ZOOM_TO_LEVEL_SIGNAL,
  59         LAST_SIGNAL
  60 };
  61
  62 static guint signals[LAST_SIGNAL];
  63
  64 static GObjectClass *parent_class = NULL;
  65
  66 static void     ephy_zoom_control_class_init    (EphyZoomControlClass *klass);
  67 static void     ephy_zoom_control_init          (EphyZoomControl *control);
  68 static void     ephy_zoom_control_finalize      (GObject *o);
  69
  70 GType
  71 ephy_zoom_control_get_type (void)
  72 {
  73         static GType type = 0;
  74
  75         if (G_UNLIKELY (type == 0))
  76         {
  77                 const GTypeInfo our_info =
  78                         {
  79                                 sizeof (EphyZoomControlClass),
  80                                 NULL, /* base_init */
  81                                 NULL, /* base_finalize */
  82                                 (GClassInitFunc) ephy_zoom_control_class_init,
  83                                 NULL,
  84                                 NULL, /* class_data */
  85                                 sizeof (EphyZoomControl),
  86                                 0, /* n_preallocs */
  87                                 (GInstanceInitFunc) ephy_zoom_control_init,
  88                         };
  89
  90                 type = g_type_register_static (GTK_TYPE_TOOL_ITEM,
  91                                                "EphyZoomControl",
  92                                                &our_info, 0);
  93         }
  94
  95         return type;
  96 }
  97
  98 static void
  99 combo_changed_cb (GtkComboBox *combo, EphyZoomControl *control)
 100 {
 101         gint index;
 102         float zoom;
 103
 104         index = gtk_combo_box_get_active (combo);
 105         zoom = zoom_levels[index].level;
 106
 107         if (zoom != control->priv->zoom)
 108         {
 109                 g_signal_emit (control, signals[ZOOM_TO_LEVEL_SIGNAL], 0, zoom);
 110         }
 111 }
 112
 113 static void
 114 sync_zoom_cb (EphyZoomControl *control, GParamSpec *pspec, gpointer data)
 115 {
 116         EphyZoomControlPrivate *p = control->priv;
 117         guint index;
 118
 119         index = ephy_zoom_get_zoom_level_index (p->zoom);
 120
 121         g_signal_handler_block (p->combo, p->handler_id);
 122         gtk_combo_box_set_active (p->combo, index);
 123         g_signal_handler_unblock (p->combo, p->handler_id);
 124 }
 125
 126 static gboolean
 127 row_is_separator (GtkTreeModel *model,
 128                   GtkTreeIter  *iter,
 129                   gpointer      data)
 130 {
 131         gboolean is_sep;
 132         gtk_tree_model_get (model, iter, COL_IS_SEP, &is_sep, -1);
 133         return is_sep;
 134 }
 135
 136 static void
 137 ephy_zoom_control_init (EphyZoomControl *control)
 138 {
 139         EphyZoomControlPrivate *p;
 140         GtkWidget *vbox;
 141         GtkCellRenderer *renderer;
 142         GtkListStore    *store;
 143         GtkTreeIter      iter;
 144         guint i;
 145
 146         p = EPHY_ZOOM_CONTROL_GET_PRIVATE (control);
 147         control->priv = p;
 148
 149         p->zoom = 1.0;
 150
 151         store = gtk_list_store_new (2, G_TYPE_STRING, G_TYPE_BOOLEAN);
 152
 153         for (i = 0; i < n_zoom_levels; i++)
 154         {
 155                 gtk_list_store_append (store, &iter);
 156
 157                 if (zoom_levels[i].name != NULL) {
 158                         gtk_list_store_set (store, &iter,
 159                                             COL_TEXT, _(zoom_levels[i].name),
 160                                             -1);
 161                 } else {
 162                         gtk_list_store_set (store, &iter,
 163                                             COL_IS_SEP, zoom_levels[i].name == NULL,
 164                                             -1);
 165                 }
 166         }
 167
 168         p->combo = GTK_COMBO_BOX (gtk_combo_box_new_with_model (GTK_TREE_MODEL (store)));
 169         g_object_unref (store);
 170
 171         renderer = gtk_cell_renderer_text_new ();
 172         gtk_cell_layout_pack_start     (GTK_CELL_LAYOUT (p->combo), renderer, TRUE);
 173         gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (p->combo), renderer,
 174                                         "text", COL_TEXT, NULL);
 175         gtk_combo_box_set_row_separator_func (p->combo,
 176                                               (GtkTreeViewRowSeparatorFunc) row_is_separator,
 177                                               NULL, NULL);
 178
 179         gtk_combo_box_set_focus_on_click (p->combo, FALSE);
 180         g_object_ref (p->combo);
 181         gtk_object_sink (GTK_OBJECT (p->combo));
 182         gtk_widget_show (GTK_WIDGET (p->combo));
 183
 184         i = ephy_zoom_get_zoom_level_index (p->zoom);
 185         gtk_combo_box_set_active (p->combo, i);
 186
 187         vbox = gtk_vbox_new (TRUE, 0);
 188         gtk_box_pack_start (GTK_BOX (vbox), GTK_WIDGET (p->combo), TRUE, FALSE, 0);
 189         gtk_widget_show (vbox);
 190
 191         gtk_container_add (GTK_CONTAINER (control), vbox);
 192
 193         p->handler_id = g_signal_connect (p->combo, "changed",
 194                                           G_CALLBACK (combo_changed_cb), control);
 195
 196         g_signal_connect_object (control, "notify::zoom",
 197                                  G_CALLBACK (sync_zoom_cb), NULL, 0);
 198 }
 199
 200 static void
 201 ephy_zoom_control_set_property (GObject *object,
 202                                 guint prop_id,
 203                                 const GValue *value,
 204                                 GParamSpec *pspec)
 205 {
 206         EphyZoomControl *control;
 207         EphyZoomControlPrivate *p;
 208
 209         control = EPHY_ZOOM_CONTROL (object);
 210         p = control->priv;
 211
 212         switch (prop_id)
 213         {
 214                 case PROP_ZOOM:
 215                         p->zoom = g_value_get_float (value);
 216                         break;
 217         }
 218 }
 219
 220 static void
 221 ephy_zoom_control_get_property (GObject *object,
 222                                 guint prop_id,
 223                                 GValue *value,
 224                                 GParamSpec *pspec)
 225 {
 226         EphyZoomControl *control;
 227         EphyZoomControlPrivate *p;
 228
 229         control = EPHY_ZOOM_CONTROL (object);
 230         p = control->priv;
 231
 232         switch (prop_id)
 233         {
 234                 case PROP_ZOOM:
 235                         g_value_set_float (value, p->zoom);
 236                         break;
 237         }
 238 }
 239
 240 #if !GTK_CHECK_VERSION (2, 11, 5)
 241 static void
 242 set_combo_tooltip (GtkWidget *widget,
 243                    GtkTooltipsData *data)
 244 {
 245         if (GTK_IS_BUTTON (widget))
 246         {
 247                 gtk_tooltips_set_tip (data->tooltips, widget,
 248                                       data->tip_text, data->tip_private);
 249         }
 250 }
 251
 252 static void
 253 combo_realized (GtkWidget *combo,
 254                 GtkWidget *control)
 255 {
 256         GtkTooltipsData *data;
 257
 258         data = gtk_tooltips_data_get (control);
 259         g_return_if_fail (data != NULL);
 260
 261         gtk_container_forall (GTK_CONTAINER (combo),
 262                               (GtkCallback) set_combo_tooltip, data);
 263 }
 264
 265 static gboolean
 266 ephy_zoom_control_set_tooltip (GtkToolItem *tool_item,
 267                                GtkTooltips *tooltips,
 268                                const char *tip_text,
 269                                const char *tip_private)
 270 {
 271         EphyZoomControl *control = EPHY_ZOOM_CONTROL (tool_item);
 272         GtkWidget *widget = GTK_WIDGET (tool_item);
 273
 274         /* hack to make tooltips work also on Ctrl-F1 */
 275         gtk_tooltips_set_tip (tooltips, widget, tip_text, tip_private);
 276
 277         g_signal_handlers_disconnect_by_func
 278                 (control->priv->combo, G_CALLBACK (combo_realized), widget);
 279
 280         if (GTK_WIDGET_REALIZED (tool_item))
 281         {
 282                 combo_realized (GTK_WIDGET (control->priv->combo), widget);
 283         }
 284         else
 285         {
 286                 g_signal_connect_after (control->priv->combo, "realize",
 287                                         G_CALLBACK (combo_realized), widget);
 288         }
 289
 290         return TRUE;
 291 }
 292 #endif /* !GTK_CHECK_VERSION (2, 11, 5) */
 293
 294 static void
 295 ephy_zoom_control_class_init (EphyZoomControlClass *klass)
 296 {
 297         GObjectClass *object_class;
 298         GtkToolItemClass *tool_item_class;
 299
 300         parent_class = g_type_class_peek_parent (klass);
 301
 302         object_class = (GObjectClass *)klass;
 303         tool_item_class = (GtkToolItemClass *)klass;
 304
 305         object_class->set_property = ephy_zoom_control_set_property;
 306         object_class->get_property = ephy_zoom_control_get_property;
 307         object_class->finalize = ephy_zoom_control_finalize;
 308
 309 #if !GTK_CHECK_VERSION (2, 11, 5)
 310         tool_item_class->set_tooltip = ephy_zoom_control_set_tooltip;
 311 #endif
 312
 313         g_object_class_install_property (object_class,
 314                                          PROP_ZOOM,
 315                                          g_param_spec_float ("zoom",
 316                                                              "Zoom",
 317                                                              "Zoom level to display in the item.",
 318                                                              ZOOM_MINIMAL,
 319                                                              ZOOM_MAXIMAL,
 320                                                              1.0,
 321                                                              G_PARAM_READWRITE));
 322
 323         signals[ZOOM_TO_LEVEL_SIGNAL] =
 324                 g_signal_new ("zoom_to_level",
 325                               G_TYPE_FROM_CLASS (klass),
 326                               G_SIGNAL_RUN_LAST,
 327                               G_STRUCT_OFFSET (EphyZoomControlClass,
 328                                                zoom_to_level),
 329                               NULL, NULL,
 330                               g_cclosure_marshal_VOID__FLOAT,
 331                               G_TYPE_NONE,
 332                               1,
 333                               G_TYPE_FLOAT);
 334
 335         g_type_class_add_private (object_class, sizeof (EphyZoomControlPrivate));
 336 }
 337
 338 static void
 339 ephy_zoom_control_finalize (GObject *o)
 340 {
 341         EphyZoomControl *control = EPHY_ZOOM_CONTROL (o);
 342
 343         g_object_unref (control->priv->combo);
 344
 345         G_OBJECT_CLASS (parent_class)->finalize (o);
 346 }
 347
 348 void
 349 ephy_zoom_control_set_zoom_level (EphyZoomControl *control, float zoom)
 350 {
 351         g_return_if_fail (EPHY_IS_ZOOM_CONTROL (control));
 352
 353         if (zoom < ZOOM_MINIMAL || zoom > ZOOM_MAXIMAL) return;
 354
 355         control->priv->zoom = zoom;
 356         g_object_notify (G_OBJECT (control), "zoom");
 357 }
 358
 359 float
 360 ephy_zoom_control_get_zoom_level (EphyZoomControl *control)
 361 {
 362         g_return_val_if_fail (EPHY_IS_ZOOM_CONTROL (control), 1.0);
 363
 364         return control->priv->zoom;
 365 }