path: root/lib/widgets/ephy-zoom-control.c

/*
 *  Copyright (C) 2003  Christian Persch
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 *  $Id$
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "ephy-zoom-control.h"
#include "ephy-marshal.h"
#include "ephy-zoom.h"
#include "ephy-debug.h"

#include <gtk/gtk.h>
#include <gtk/gtkcombobox.h>
#include <gtk/gtktooltips.h>
#include <glib/gi18n.h>

#define EPHY_ZOOM_CONTROL_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_ZOOM_CONTROL, EphyZoomControlPrivate))

struct _EphyZoomControlPrivate {
    GtkComboBox *combo;
    float zoom;
    guint handler_id;
};

enum
{
    PROP_0,
    PROP_ZOOM
};

enum
{
    ZOOM_TO_LEVEL_SIGNAL,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL];

static GObjectClass *parent_class = NULL;

static void ephy_zoom_control_class_init    (EphyZoomControlClass *klass);
static void ephy_zoom_control_init      (EphyZoomControl *control);
static void ephy_zoom_control_finalize  (GObject *o);

#define MENU_ID "ephy-zoom-control-menu-id"

GType
ephy_zoom_control_get_type (void)
{
    static GType type = 0;

    if (type == 0)
    {
        static const GTypeInfo our_info =
            {
                sizeof (EphyZoomControlClass),
                NULL, /* base_init */
                NULL, /* base_finalize */
                (GClassInitFunc) ephy_zoom_control_class_init,
                NULL,
                NULL, /* class_data */
                sizeof (EphyZoomControl),
                0, /* n_preallocs */
                (GInstanceInitFunc) ephy_zoom_control_init,
            };

        type = g_type_register_static (GTK_TYPE_TOOL_ITEM,
                           "EphyZoomControl",
                           &our_info, 0);
    }

    return type;
}

static void
proxy_menu_activate_cb (GtkMenuItem *menu_item, EphyZoomControl *control)
{
    gint index;
    float zoom;

    /* menu item was toggled OFF */
    if (!gtk_check_menu_item_get_active (GTK_CHECK_MENU_ITEM (menu_item))) return;

    index = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (menu_item), "zoom-level"));
    zoom = zoom_levels[index].level;

    if (zoom != control->priv->zoom)
    {
        g_signal_emit (control, signals[ZOOM_TO_LEVEL_SIGNAL], 0, zoom);
    }
}

static gboolean
ephy_zoom_control_create_menu_proxy (GtkToolItem *item)
{
    EphyZoomControl *control = EPHY_ZOOM_CONTROL (item);
    EphyZoomControlPrivate *p = control->priv;
    GtkWidget *menu, *menu_item;
    GSList *group = NULL;
    gint i;

    menu = gtk_menu_new ();

    for (i = 0; i < n_zoom_levels; i++)
    {
        menu_item = gtk_radio_menu_item_new_with_label (group, _(zoom_levels[i].name));
        group = gtk_radio_menu_item_get_group (GTK_RADIO_MENU_ITEM (menu_item));

        gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (menu_item),
                        p->zoom == zoom_levels[i].level);

        gtk_widget_show (menu_item);
        gtk_menu_shell_append (GTK_MENU_SHELL (menu), menu_item);

        g_object_set_data (G_OBJECT (menu_item), "zoom-level", GINT_TO_POINTER (i));
        g_signal_connect_object (G_OBJECT (menu_item), "activate",
                     G_CALLBACK (proxy_menu_activate_cb), control, 0);
    }

    menu_item = gtk_menu_item_new_with_mnemonic (_("_Zoom"));
    gtk_menu_item_set_submenu (GTK_MENU_ITEM (menu_item), menu);

    gtk_widget_show (menu);
    gtk_widget_show (menu_item);

    g_object_ref (menu_item);
    gtk_object_sink (GTK_OBJECT (menu_item));
    gtk_tool_item_set_proxy_menu_item (item, MENU_ID, menu_item);
    g_object_unref (menu_item);

    return TRUE;
}

static void
combo_changed_cb (GtkComboBox *combo, EphyZoomControl *control)
{
    gint index;
    float zoom;

    index = gtk_combo_box_get_active (combo);
    zoom = zoom_levels[index].level;

    if (zoom != control->priv->zoom)
    {
        g_signal_emit (control, signals[ZOOM_TO_LEVEL_SIGNAL], 0, zoom);    
    }
}

static void
sync_zoom_cb (EphyZoomControl *control, GParamSpec *pspec, gpointer data)
{
    EphyZoomControlPrivate *p = control->priv;
    guint index;

    index = ephy_zoom_get_zoom_level_index (p->zoom);

    g_signal_handler_block (p->combo, p->handler_id);
    gtk_combo_box_set_active (p->combo, index);
    g_signal_handler_unblock (p->combo, p->handler_id); 
}

static void
ephy_zoom_control_init (EphyZoomControl *control)
{
    EphyZoomControlPrivate *p;
    GtkComboBox *combo;
    GtkWidget *box;
    guint i;

    p = EPHY_ZOOM_CONTROL_GET_PRIVATE (control);
    control->priv = p;

    p->zoom = 1.0;

    combo = GTK_COMBO_BOX (gtk_combo_box_new_text ());

    for (i = 0; i < n_zoom_levels; i++)
    {
        gtk_combo_box_append_text (combo, _(zoom_levels[i].name));
    }

    p->combo = combo;
    g_object_ref (combo);
    gtk_object_sink (GTK_OBJECT (combo));
    gtk_widget_show (GTK_WIDGET (combo));

    i = ephy_zoom_get_zoom_level_index (p->zoom);
    gtk_combo_box_set_active (combo, i);

    box = gtk_vbox_new (TRUE, 0);
    gtk_box_pack_start (GTK_BOX (box), GTK_WIDGET (combo), TRUE, FALSE, 0);
    gtk_widget_show (box);

    gtk_container_add (GTK_CONTAINER (control), box);

    p->handler_id = g_signal_connect (combo, "changed",
                      G_CALLBACK (combo_changed_cb), control);
    
    g_signal_connect_object (control, "notify::zoom",
                 G_CALLBACK (sync_zoom_cb), NULL, 0);
}

static void
ephy_zoom_control_set_property (GObject *object,
                guint prop_id,
                const GValue *value,
                GParamSpec *pspec)
{
    EphyZoomControl *control;
    EphyZoomControlPrivate *p;

    control = EPHY_ZOOM_CONTROL (object);
    p = control->priv;

    switch (prop_id)
    {
        case PROP_ZOOM:
            p->zoom = g_value_get_float (value);
            g_object_notify (object, "zoom");
            break;
    }
}

static void
ephy_zoom_control_get_property (GObject *object,
                guint prop_id,
                GValue *value,
                GParamSpec *pspec)
{
    EphyZoomControl *control;
    EphyZoomControlPrivate *p;

    control = EPHY_ZOOM_CONTROL (object);
    p = control->priv;

    switch (prop_id)
    {
        case PROP_ZOOM:
            g_value_set_float (value, p->zoom);
            break;
    }
}

static gboolean
ephy_zoom_control_set_tooltip (GtkToolItem *tool_item,
                   GtkTooltips *tooltips,
                   const char *tip_text,
                   const char *tip_private)
{
    EphyZoomControl *control = EPHY_ZOOM_CONTROL (tool_item);

    gtk_tooltips_set_tip (tooltips, GTK_WIDGET (control->priv->combo),
                  tip_text, tip_private);

    return TRUE;
}

static void
ephy_zoom_control_class_init (EphyZoomControlClass *klass)
{
    GObjectClass *object_class;
    GtkToolItemClass *tool_item_class;

    parent_class = g_type_class_peek_parent (klass);

    object_class = (GObjectClass *)klass;
    tool_item_class = (GtkToolItemClass *)klass;

    object_class->set_property = ephy_zoom_control_set_property;
    object_class->get_property = ephy_zoom_control_get_property;
    object_class->finalize = ephy_zoom_control_finalize;

    tool_item_class->create_menu_proxy = ephy_zoom_control_create_menu_proxy;
    tool_item_class->set_tooltip = ephy_zoom_control_set_tooltip;

    g_object_class_install_property (object_class,
                     PROP_ZOOM,
                     g_param_spec_float ("zoom",
                                 "Zoom",
                                 "Zoom level to display in the item.",
                                 ZOOM_MINIMAL,
                                 ZOOM_MAXIMAL,
                                 1.0,
                                 G_PARAM_READWRITE));

    signals[ZOOM_TO_LEVEL_SIGNAL] =
        g_signal_new ("zoom_to_level",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EphyZoomControlClass,
                           zoom_to_level),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__FLOAT,
                  G_TYPE_NONE,
                  1,
                  G_TYPE_FLOAT);

    g_type_class_add_private (object_class, sizeof (EphyZoomControlPrivate));
}

static void
ephy_zoom_control_finalize (GObject *o)
{
    EphyZoomControl *control = EPHY_ZOOM_CONTROL (o);

    g_object_unref (control->priv->combo);

    G_OBJECT_CLASS (parent_class)->finalize (o);
}

void
ephy_zoom_control_set_zoom_level (EphyZoomControl *control, float zoom)
{
    g_return_if_fail (EPHY_IS_ZOOM_CONTROL (control));
    
    if (zoom < ZOOM_MINIMAL || zoom > ZOOM_MAXIMAL) return;

    control->priv->zoom = zoom;
    g_object_notify (G_OBJECT (control), "zoom");
}

float
ephy_zoom_control_get_zoom_level (EphyZoomControl *control)
{
    g_return_val_if_fail (EPHY_IS_ZOOM_CONTROL (control), 1.0);
    
    return control->priv->zoom;
}