hedera/vn/field/vn-check.c

/*
 * Copyright (C) 2012 - Juan Ferrer Toribio
 *
 * 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
 */

#include "vn-check.h"
#include <db/db.h>

/**
 * SECTION:vn-check
 * @Short_description: a checkbox widget
 * @Title: VnCheck
 * @See_also: #VnField
 * @Image: check.png
 *
 * A checkbox widget to use in boolean fields.
 */
G_DEFINE_TYPE (VnCheck, vn_check, VN_TYPE_FIELD);

/**
 * vn_check_new:
 *
 * Creates a new #VnCheck
 *
 * Return value: a #VnCheck
 **/
VnField * vn_check_new ()
{
	return VN_FIELD (g_object_new (VN_TYPE_CHECK, NULL));
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Private

static void vn_check_changed (VnCheck * obj)
{
	GValue value = {0};
	
	if (!gtk_toggle_button_get_inconsistent (obj->button))
	{
		g_value_init (&value, G_TYPE_BOOLEAN);
		g_value_set_boolean (&value, gtk_toggle_button_get_active (obj->button));
	}
	else
		g_value_init (&value, GVN_TYPE_NULL);

	VN_FIELD_GET_CLASS (obj)->value_changed (VN_FIELD (obj), &value);
	g_value_unset (&value);
}

static void vn_check_on_toggled (GtkToggleButton * button, VnCheck * obj)
{
	gtk_toggle_button_set_inconsistent (button, FALSE);
	vn_check_changed (obj);
}

static gboolean vn_check_on_secondary_button (GtkToggleButton * button, GdkEventButton * event, VnField * obj)
{
	if (event->type != GDK_BUTTON_RELEASE || event->button != 3 || !vn_field_get_null (obj))
		return FALSE;

	if (gtk_toggle_button_get_inconsistent (button))
		gtk_toggle_button_set_inconsistent (button, FALSE);
	else
		gtk_toggle_button_set_inconsistent (button, TRUE);

	g_signal_handlers_block_by_func (button, vn_check_on_toggled, obj);
	gtk_toggle_button_set_active (button, FALSE);
	g_signal_handlers_unblock_by_func (button, vn_check_on_toggled, obj);
	
	vn_check_changed (VN_CHECK (obj));
	return FALSE;
}

static void vn_check_set_value (VnCheck * obj, const GValue * value)
{
	GValue new_value = {0};

	if (!gvn_value_is_null (value))
	{
		g_value_init (&new_value, G_TYPE_BOOLEAN);
		g_value_transform (value, &new_value);
	}
	else
		g_value_init (&new_value, GVN_TYPE_NULL);

	g_signal_handlers_block_by_func (obj->button, vn_check_on_toggled, obj);
	
	if (!gvn_value_is_null (&new_value))
	{
		gtk_toggle_button_set_inconsistent (obj->button, FALSE);
		gtk_toggle_button_set_active (obj->button,
			g_value_get_boolean (&new_value));
	}
	else
	{
		gtk_toggle_button_set_inconsistent (obj->button, TRUE);
		gtk_toggle_button_set_active (obj->button, FALSE);
	}

	g_signal_handlers_unblock_by_func (obj->button, vn_check_on_toggled, obj);

	g_value_unset (&new_value);
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Class

static void vn_check_init (VnCheck * obj)
{	
	obj->button = GTK_TOGGLE_BUTTON (gtk_check_button_new ());
	gtk_button_set_use_underline (GTK_BUTTON (obj->button), TRUE);
	g_object_connect (obj->button
		,"signal::toggled", vn_check_on_toggled, obj
		,"signal::button-release-event", vn_check_on_secondary_button, obj
		,NULL
	);
	gtk_container_add (GTK_CONTAINER (obj), GTK_WIDGET (obj->button));

	VN_FIELD (obj)->field = GTK_WIDGET (obj->button);
}

static void vn_check_finalize (VnCheck * obj)
{
	G_OBJECT_CLASS (vn_check_parent_class)->finalize (G_OBJECT (obj));
}

static void vn_check_class_init (VnCheckClass * klass)
{
	G_OBJECT_CLASS (klass)->finalize = (GObjectFinalizeFunc) vn_check_finalize;
	VN_FIELD_CLASS (klass)->set_value = (VnFieldSetValueFunc) vn_check_set_value;
}