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79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/* gtkaccessiblerange.c: Accessible range interface
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*
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* SPDX-FileCopyrightText: 2022 Red Hat Inc.
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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/**
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* GtkAccessibleRange:
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*
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* This interface describes ranged controls, e.g. controls which have a single
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* value within an allowed range and that can optionally be changed by the user.
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*
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* This interface is expected to be implemented by controls using the following
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* roles:
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*
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* - `GTK_ACCESSIBLE_ROLE_METER`
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* - `GTK_ACCESSIBLE_ROLE_PROGRESS_BAR`
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* - `GTK_ACCESSIBLE_ROLE_SCROLLBAR`
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* - `GTK_ACCESSIBLE_ROLE_SLIDER`
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* - `GTK_ACCESSIBLE_ROLE_SPIN_BUTTON`
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*
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* If that is not the case, a warning will be issued at run time.
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*
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* In addition to this interface, its implementers are expected to provide the
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* correct values for the following properties:
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*
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* - `GTK_ACCESSIBLE_PROPERTY_VALUE_MAX`
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* - `GTK_ACCESSIBLE_PROPERTY_VALUE_MIN`
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* - `GTK_ACCESSIBLE_PROPERTY_VALUE_NOW`
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* - `GTK_ACCESSIBLE_PROPERTY_VALUE_TEXT`
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*
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* Since: 4.10
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*/
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#include "config.h"
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#include "gtkaccessiblerangeprivate.h"
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#include "gtkaccessibleprivate.h"
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#include "gtkatcontextprivate.h"
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#include "gtkaccessiblevalueprivate.h"
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G_DEFINE_INTERFACE (GtkAccessibleRange, gtk_accessible_range, GTK_TYPE_ACCESSIBLE)
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static gboolean
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gtk_accessible_range_default_set_current_value (GtkAccessibleRange *accessible_range,
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double value)
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{
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return TRUE;
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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->set_current_value = gtk_accessible_range_default_set_current_value;
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}
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/*< private >
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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` to the given value
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*
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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
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* may in some cases do nothing
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*
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* Returns: true if the call changed the value, and false otherwise
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*/
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gboolean
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gtk_accessible_range_set_current_value (GtkAccessibleRange *self, double value)
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{
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g_return_val_if_fail (GTK_IS_ACCESSIBLE_RANGE (self), FALSE);
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GtkAccessibleRangeInterface *iface = GTK_ACCESSIBLE_RANGE_GET_IFACE (self);
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return iface->set_current_value (self, value);
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}
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