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/* ATK - Accessibility Toolkit
* Copyright 2001, 2002, 2003 Sun Microsystems Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include "atkvalue.h"
/**
* SECTION:atkvalue
* @Short_description: The ATK interface implemented by valuators and
* components which display or select a value from a bounded range of
* values.
* @Title:AtkValue
*
* #AtkValue should be implemented for components which either display
* a value from a bounded range, or which allow the user to specify a
* value from a bounded range, or both. For instance, most sliders
* and range controls, as well as dials, should have #AtkObject
* representations which implement #AtkValue on the component's
* behalf. #AtKValues may be read-only, in which case attempts to
* alter the value return FALSE to indicate failure.
*/
GType
atk_value_get_type (void)
{
static GType type = 0;
if (!type) {
GTypeInfo tinfo =
{
sizeof (AtkValueIface),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
};
type = g_type_register_static (G_TYPE_INTERFACE, "AtkValue", &tinfo, 0);
}
return type;
}
/**
* atk_value_get_current_value:
* @obj: a GObject instance that implements AtkValueIface
* @value: a #GValue representing the current accessible value
*
* Gets the value of this object.
**/
void
atk_value_get_current_value (AtkValue *obj,
GValue *value)
{
AtkValueIface *iface;
g_return_if_fail (value != NULL);
g_return_if_fail (ATK_IS_VALUE (obj));
iface = ATK_VALUE_GET_IFACE (obj);
if (iface->get_current_value)
{
if (G_IS_VALUE (value))
g_value_unset (value);
else
memset (value, 0, sizeof (*value));
(iface->get_current_value) (obj, value);
}
}
/**
* atk_value_get_maximum_value:
* @obj: a GObject instance that implements AtkValueIface
* @value: a #GValue representing the maximum accessible value
*
* Gets the maximum value of this object.
**/
void
atk_value_get_maximum_value (AtkValue *obj,
GValue *value)
{
AtkValueIface *iface;
g_return_if_fail (value != NULL);
g_return_if_fail (ATK_IS_VALUE (obj));
iface = ATK_VALUE_GET_IFACE (obj);
if (iface->get_maximum_value)
{
if (G_IS_VALUE (value))
g_value_unset (value);
else
memset (value, 0, sizeof (*value));
(iface->get_maximum_value) (obj, value);
}
}
/**
* atk_value_get_minimum_value:
* @obj: a GObject instance that implements AtkValueIface
* @value: a #GValue representing the minimum accessible value
*
* Gets the minimum value of this object.
**/
void
atk_value_get_minimum_value (AtkValue *obj,
GValue *value)
{
AtkValueIface *iface;
g_return_if_fail (value != NULL);
g_return_if_fail (ATK_IS_VALUE (obj));
iface = ATK_VALUE_GET_IFACE (obj);
if (iface->get_minimum_value)
{
if (G_IS_VALUE (value))
g_value_unset (value);
else
memset (value, 0, sizeof (*value));
(iface->get_minimum_value) (obj, value);
}
}
/**
* atk_value_get_minimum_increment:
* @obj: a GObject instance that implements AtkValueIface
* @value: a #GValue representing the minimum increment by which the accessible value may be changed
*
* Gets the minimum increment by which the value of this object may be changed. If zero,
* the minimum increment is undefined, which may mean that it is limited only by the
* floating point precision of the platform.
*
* Since: 1.12
**/
void
atk_value_get_minimum_increment (AtkValue *obj,
GValue *value)
{
AtkValueIface *iface;
g_return_if_fail (value != NULL);
g_return_if_fail (ATK_IS_VALUE (obj));
iface = ATK_VALUE_GET_IFACE (obj);
if (iface->get_minimum_increment)
{
if (G_IS_VALUE (value))
g_value_unset (value);
else
memset (value, 0, sizeof (*value));
(iface->get_minimum_increment) (obj, value);
}
}
/**
* atk_value_set_current_value:
* @obj: a GObject instance that implements AtkValueIface
* @value: a #GValue which is the desired new accessible value.
*
* Sets the value of this object.
*
* Returns: %TRUE if new value is successfully set, %FALSE otherwise.
**/
gboolean
atk_value_set_current_value (AtkValue *obj,
const GValue *value)
{
AtkValueIface *iface;
g_return_val_if_fail (ATK_IS_VALUE (obj), FALSE);
g_return_val_if_fail (G_IS_VALUE (value), FALSE);
iface = ATK_VALUE_GET_IFACE (obj);
if (iface->set_current_value)
return (iface->set_current_value) (obj, value);
else
return FALSE;
}
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