forked from AuroraMiddleware/gtk
94 lines
3.3 KiB
C
94 lines
3.3 KiB
C
/* gtkaccessiblerange.c: Accessible range interface
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*
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* Copyright © 2022 Red Hat Inc.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* GtkAccessibleRange:
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*
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* This interface describes range controls, e. g. controls which have a single
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* value which can optionally be changed by the user.
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*
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* This interface is expected to be implemented by controls of the
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* %GTK_ACCESSIBLE_ROLE_METER, %GTK_ACCESSIBLE_ROLE_PROGRESS_BAR,
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* %GTK_ACCESSIBLE_ROLE_SCROLLBAR, %GTK_ACCESSIBLE_ROLE_SLIDER and %GTK_ACCESSIBLE_ROLE_SPIN_BUTTON
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* role. If that is not the case, a warning will be issued at runtime.
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*
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* In addition to this interface, its implementors are expected to provide the
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* correct values for the following properties: %GTK_ACCESSIBLE_PROPERTY_VALUE_MAX,
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* %GTK_ACCESSIBLE_PROPERTY_VALUE_MIN and %GTK_ACCESSIBLE_PROPERTY_VALUE_NOW.
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*/
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#include "config.h"
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#include "gtkaccessiblerange.h"
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G_DEFINE_INTERFACE (GtkAccessibleRange, gtk_accessible_range, GTK_TYPE_ACCESSIBLE)
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static double
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gtk_accessible_range_default_get_minimum_increment (GtkAccessibleRange *accessible_range)
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{
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return 0.0;
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}
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static void
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gtk_accessible_range_default_set_current_value (GtkAccessibleRange *accessible_range, double value)
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{
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/* By default, we do nothing */
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}
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static void
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gtk_accessible_range_default_init (GtkAccessibleRangeInterface *iface)
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{
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iface->get_minimum_increment = gtk_accessible_range_default_get_minimum_increment;
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iface->set_current_value = gtk_accessible_range_default_set_current_value;
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}
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/*
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* gtk_accessible_range_get_minimum_increment:
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* @self: a `GtkAccessibleRange`
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*
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* Returns the minimum increment which this `GtkAccessibleRange` supports.
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*
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* Returns: the minimum increment, or 0.0 if not overridden
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*/
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double
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gtk_accessible_range_get_minimum_increment (GtkAccessibleRange *self)
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{
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g_return_val_if_fail (GTK_IS_ACCESSIBLE_RANGE (self), .0);
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return GTK_ACCESSIBLE_RANGE_GET_IFACE (self)->get_minimum_increment (self);
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}
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/*
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* gtk_accessible_range_set_current_value:
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* @self: a `GtkAccessibleRange`
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*
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* Sets the current value of this `GtkAccessibleRange`.
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* Note that for some widgets implementing this interface, setting a value
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* through the accessibility API makes no sense, so calling this function may
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* in some cases do nothing.
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*/
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void
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gtk_accessible_range_set_current_value (GtkAccessibleRange *self, double value)
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{
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g_return_if_fail (GTK_IS_ACCESSIBLE_RANGE (self));
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GtkAccessibleRangeInterface *iface = GTK_ACCESSIBLE_RANGE_GET_IFACE (self);
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iface->set_current_value (self, value);
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} |