/*
 *  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_box_new (GTK_ORIENTATION_VERTICAL, 0);
	gtk_box_set_homogeneous (GTK_BOX (vbox), TRUE);
	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;

	object_class = (GObjectClass *)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;
}
