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

/*
 *  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-control.h"
#include "ephy-zoom.h"

/**
 * SECTION:ephy-zoom-control
 * @short_description: A #GtkToolItem implementing a zoom control
 *
 * #EphyZoomControl implements the zoom control used in Epiphany's toolbar.
 */

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

G_DEFINE_TYPE (EphyZoomControl, ephy_zoom_control, GTK_TYPE_TOOL_ITEM)

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 *vbox;
    guint i;

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

    p->zoom = 1.0;

    combo = p->combo = GTK_COMBO_BOX (gtk_combo_box_text_new ());

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

    p->combo = combo;
    gtk_combo_box_set_focus_on_click (GTK_COMBO_BOX (p->combo), FALSE);
    g_object_ref_sink (combo);
    gtk_widget_show (GTK_WIDGET (combo));

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

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

    gtk_container_add (GTK_CONTAINER (control), vbox);

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

    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->dispose = ephy_zoom_control_dispose;

    /**
    * EphyZoomControl:zoom:
    *
    * The current value of #EphyZoomControl, 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));

    /**
    * EphyZoomControl::zoom-to-level:
    * @control: the object on which the signal is emitted
    * @level: new zoom level
    *
    * Emitted when the user changes the value of the #EphyZoomControl.
    */
    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_dispose (GObject *o)
{
    EphyZoomControl *control = EPHY_ZOOM_CONTROL (o);

    if (control->priv->combo)
    {
        g_object_unref (control->priv->combo);
        control->priv->combo = NULL;
    }

    G_OBJECT_CLASS (ephy_zoom_control_parent_class)->dispose (o);
}

/**
 * ephy_zoom_control_set_zoom_level:
 * @control: an #EphyZoomControl
 * @zoom: the new value for the zoom level
 *
 * Sets the zoom level of @control.
 **/
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");
}

/**
 * ephy_zoom_control_get_zoom_level:
 * @control: an #EphyZoomControl
 *
 * Get the current zoom level of @control.
 *
 * Returns: the zoom level as a float
 **/
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;
}