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

/*
 *  Copyright © 2003 Marco Pesenti Gritti
 *  Copyright © 2003, 2004 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"

#include <glib/gi18n.h>

#include "ephy-zoom-action.h"
#include "ephy-zoom-control.h"
#include "ephy-zoom.h"

/**
 * SECTION:ephy-zoom-action
 * @short_description: A #GtkAction implementing a zoom control
 *
 * #EphyZoomAction implements a #GtkAction able to control the zoom level.
 */

#define EPHY_ZOOM_ACTION_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_ZOOM_ACTION, EphyZoomActionPrivate))

struct _EphyZoomActionPrivate
{
    float zoom;
};

enum
{
    PROP_0,
    PROP_ZOOM
};


static void ephy_zoom_action_init       (EphyZoomAction *action);
static void ephy_zoom_action_class_init (EphyZoomActionClass *class);

enum
{
    ZOOM_TO_LEVEL_SIGNAL,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };

G_DEFINE_TYPE (EphyZoomAction, ephy_zoom_action, GTK_TYPE_ACTION)

static void
zoom_to_level_cb (EphyZoomControl *control,
          float zoom,
          EphyZoomAction *action)
{
    g_signal_emit (action, signals[ZOOM_TO_LEVEL_SIGNAL], 0, zoom);
}

static void
sync_zoom_cb (GtkAction *action, GParamSpec *pspec, GtkWidget *proxy)
{
    EphyZoomAction *zoom_action = EPHY_ZOOM_ACTION (action);

    g_object_set (G_OBJECT (proxy), "zoom", zoom_action->priv->zoom, NULL);
}

static void
connect_proxy (GtkAction *action, GtkWidget *proxy)
{
    if (EPHY_IS_ZOOM_CONTROL (proxy))
    {
        /* Ensure the sync is done when the item is added to
           the toolbar */
        sync_zoom_cb (action, NULL, proxy);

        g_signal_connect_object (action, "notify::zoom",
                     G_CALLBACK (sync_zoom_cb), proxy, 0);
    
        g_signal_connect (proxy, "zoom_to_level",
                  G_CALLBACK (zoom_to_level_cb), action);
    }

    GTK_ACTION_CLASS (ephy_zoom_action_parent_class)->connect_proxy (action, proxy);
}

static void
proxy_menu_activate_cb (GtkMenuItem *menu_item, EphyZoomAction *action)
{
    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 != action->priv->zoom)
    {
        g_signal_emit (action, signals[ZOOM_TO_LEVEL_SIGNAL], 0, zoom);
    }
}

static GtkWidget *
create_menu_item (GtkAction *action)
{
    EphyZoomActionPrivate *p = EPHY_ZOOM_ACTION (action)->priv;
    GtkWidget *menu, *menu_item;
    GSList *group = NULL;
    int 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), action, 0);
    }

    gtk_widget_show (menu);

        menu_item = GTK_ACTION_CLASS (ephy_zoom_action_parent_class)->create_menu_item (action);

    gtk_menu_item_set_submenu (GTK_MENU_ITEM (menu_item), menu);

    gtk_widget_show (menu_item);

    return menu_item;
}

static void
ephy_zoom_action_set_property (GObject *object,
                   guint prop_id,
                   const GValue *value,
                   GParamSpec *pspec)
{
    EphyZoomAction *action;

    action = EPHY_ZOOM_ACTION (object);

    switch (prop_id)
    {
        case PROP_ZOOM:
            action->priv->zoom = g_value_get_float (value);
            break;
    }
}

static void
ephy_zoom_action_get_property (GObject *object,
                   guint prop_id,
                   GValue *value,
                   GParamSpec *pspec)
{
    EphyZoomAction *action;

    action = EPHY_ZOOM_ACTION (object);

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

static void
ephy_zoom_action_class_init (EphyZoomActionClass *class)
{
    GObjectClass *object_class = G_OBJECT_CLASS (class);
    GtkActionClass *action_class = GTK_ACTION_CLASS (class);

    object_class->set_property = ephy_zoom_action_set_property;
    object_class->get_property = ephy_zoom_action_get_property;

    action_class->toolbar_item_type = EPHY_TYPE_ZOOM_CONTROL;
    action_class->connect_proxy = connect_proxy;
    action_class->create_menu_item = create_menu_item;

    /**
    * EphyZoomAction:zoom:
    *
    * The current value of #EphyZoomAction, as a float.
    */
    g_object_class_install_property (object_class,
                     PROP_ZOOM,
                     g_param_spec_float ("zoom", NULL, NULL,
                                 ZOOM_MINIMAL,
                                 ZOOM_MAXIMAL,
                                 1.0,
                                 G_PARAM_READWRITE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB));

    /**
    * EphyZoomAction::zoom-to-level:
    * @action: the object on which the signal is emitted
    * @level: new zoom level
    *
    * Emitted when the user changes the value of the #EphyZoomAction.
    */
    signals[ZOOM_TO_LEVEL_SIGNAL] =
        g_signal_new ("zoom-to-level",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_FIRST,
                  G_STRUCT_OFFSET (EphyZoomActionClass, 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 (EphyZoomActionPrivate));
}

static void
ephy_zoom_action_init (EphyZoomAction *action)
{
    action->priv = EPHY_ZOOM_ACTION_GET_PRIVATE (action);

    action->priv->zoom = 1.0;
}

/**
 * ephy_zoom_action_set_zoom_level:
 * @action: an #EphyZoomAction
 * @zoom: the new value for the zoom level
 *
 * Sets the zoom level of @action.
 **/
void
ephy_zoom_action_set_zoom_level (EphyZoomAction *action, float zoom)
{
    g_return_if_fail (EPHY_IS_ZOOM_ACTION (action));
    
    if (zoom < ZOOM_MINIMAL || zoom > ZOOM_MAXIMAL) return;

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

/**
 * ephy_zoom_action_get_zoom_level:
 * @action: an #EphyZoomControl
 *
 * Get the current zoom level of @action.
 *
 * Returns: the zoom level as a float
 **/
float
ephy_zoom_action_get_zoom_level (EphyZoomAction *action)
{
    g_return_val_if_fail (EPHY_IS_ZOOM_ACTION (action), 1.0);
    
    return action->priv->zoom;
}