201 lines
6.9 KiB
C++
201 lines
6.9 KiB
C++
/*
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* Copyright (C) 2011, 2012 Igalia S.L.
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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 Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "WebKitAccessibleInterfaceValue.h"
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#if ENABLE(ACCESSIBILITY)
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#include "AccessibilityObject.h"
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#include "HTMLNames.h"
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#include "WebKitAccessible.h"
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#include "WebKitAccessibleUtil.h"
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#include <wtf/text/CString.h>
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using namespace WebCore;
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static AccessibilityObject* core(AtkValue* value)
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{
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if (!WEBKIT_IS_ACCESSIBLE(value))
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return 0;
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return &webkitAccessibleGetAccessibilityObject(WEBKIT_ACCESSIBLE(value));
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}
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static bool webkitAccessibleSetNewValue(AtkValue* coreValue, const gdouble newValue)
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{
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AccessibilityObject* coreObject = core(coreValue);
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if (!coreObject->canSetValueAttribute())
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return FALSE;
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// Check value against range limits
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double value;
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value = std::max(static_cast<double>(coreObject->minValueForRange()), newValue);
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value = std::min(static_cast<double>(coreObject->maxValueForRange()), newValue);
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coreObject->setValue(String::numberToStringFixedPrecision(value));
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return TRUE;
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}
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static float webkitAccessibleGetIncrementValue(AccessibilityObject* coreObject)
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{
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if (!coreObject->getAttribute(HTMLNames::stepAttr).isEmpty())
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return coreObject->stepValueForRange();
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// If 'step' attribute is not defined, WebCore assumes a 5% of the
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// range between minimum and maximum values. Implicit value of step should be one or larger.
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float step = (coreObject->maxValueForRange() - coreObject->minValueForRange()) * 0.05;
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return step < 1 ? 1 : step;
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}
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static void webkitAccessibleGetValueAndText(AtkValue* value, gdouble* currentValue, gchar** alternativeText)
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{
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g_return_if_fail(ATK_VALUE(value));
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returnIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value));
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AccessibilityObject* coreObject = core(value);
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if (!coreObject)
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return;
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if (currentValue)
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*currentValue = coreObject->valueForRange();
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if (alternativeText)
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*alternativeText = g_strdup_printf("%s", coreObject->valueDescription().utf8().data());
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}
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static double webkitAccessibleGetIncrement(AtkValue* value)
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{
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g_return_val_if_fail(ATK_VALUE(value), 0);
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returnValIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value), 0);
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AccessibilityObject* coreObject = core(value);
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if (!coreObject)
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return 0;
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return webkitAccessibleGetIncrementValue(coreObject);
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}
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static void webkitAccessibleSetValue(AtkValue* value, const gdouble newValue)
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{
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g_return_if_fail(ATK_VALUE(value));
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returnIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value));
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webkitAccessibleSetNewValue(value, newValue);
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}
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static AtkRange* webkitAccessibleGetRange(AtkValue* value)
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{
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g_return_val_if_fail(ATK_VALUE(value), nullptr);
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returnValIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value), nullptr);
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AccessibilityObject* coreObject = core(value);
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if (!coreObject)
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return nullptr;
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gdouble minValue = coreObject->minValueForRange();
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gdouble maxValue = coreObject->maxValueForRange();
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gchar* valueDescription = g_strdup_printf("%s", coreObject->valueDescription().utf8().data());
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return atk_range_new(minValue, maxValue, valueDescription);
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}
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static void webkitAccessibleValueGetCurrentValue(AtkValue* value, GValue* gValue)
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{
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g_return_if_fail(ATK_VALUE(value));
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returnIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value));
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memset(gValue, 0, sizeof(GValue));
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g_value_init(gValue, G_TYPE_FLOAT);
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g_value_set_float(gValue, core(value)->valueForRange());
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}
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static void webkitAccessibleValueGetMaximumValue(AtkValue* value, GValue* gValue)
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{
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g_return_if_fail(ATK_VALUE(value));
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returnIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value));
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memset(gValue, 0, sizeof(GValue));
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g_value_init(gValue, G_TYPE_FLOAT);
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g_value_set_float(gValue, core(value)->maxValueForRange());
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}
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static void webkitAccessibleValueGetMinimumValue(AtkValue* value, GValue* gValue)
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{
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g_return_if_fail(ATK_VALUE(value));
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returnIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value));
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memset(gValue, 0, sizeof(GValue));
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g_value_init(gValue, G_TYPE_FLOAT);
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g_value_set_float(gValue, core(value)->minValueForRange());
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}
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static gboolean webkitAccessibleValueSetCurrentValue(AtkValue* value, const GValue* gValue)
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{
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g_return_val_if_fail(ATK_VALUE(value), FALSE);
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returnValIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value), FALSE);
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double newValue;
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if (G_VALUE_HOLDS_DOUBLE(gValue))
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newValue = g_value_get_double(gValue);
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else if (G_VALUE_HOLDS_FLOAT(gValue))
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newValue = g_value_get_float(gValue);
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else if (G_VALUE_HOLDS_INT64(gValue))
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newValue = g_value_get_int64(gValue);
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else if (G_VALUE_HOLDS_INT(gValue))
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newValue = g_value_get_int(gValue);
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else if (G_VALUE_HOLDS_LONG(gValue))
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newValue = g_value_get_long(gValue);
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else if (G_VALUE_HOLDS_ULONG(gValue))
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newValue = g_value_get_ulong(gValue);
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else if (G_VALUE_HOLDS_UINT64(gValue))
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newValue = g_value_get_uint64(gValue);
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else if (G_VALUE_HOLDS_UINT(gValue))
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newValue = g_value_get_uint(gValue);
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else
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return FALSE;
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return webkitAccessibleSetNewValue(value, newValue);
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}
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static void webkitAccessibleValueGetMinimumIncrement(AtkValue* value, GValue* gValue)
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{
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g_return_if_fail(ATK_VALUE(value));
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returnIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value));
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memset(gValue, 0, sizeof(GValue));
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g_value_init(gValue, G_TYPE_FLOAT);
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AccessibilityObject* coreObject = core(value);
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g_value_set_float(gValue, webkitAccessibleGetIncrementValue(coreObject));
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}
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void webkitAccessibleValueInterfaceInit(AtkValueIface* iface)
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{
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iface->get_value_and_text = webkitAccessibleGetValueAndText;
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iface->get_increment = webkitAccessibleGetIncrement;
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iface->set_value = webkitAccessibleSetValue;
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iface->get_range = webkitAccessibleGetRange;
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iface->get_current_value = webkitAccessibleValueGetCurrentValue;
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iface->get_maximum_value = webkitAccessibleValueGetMaximumValue;
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iface->get_minimum_value = webkitAccessibleValueGetMinimumValue;
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iface->set_current_value = webkitAccessibleValueSetCurrentValue;
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iface->get_minimum_increment = webkitAccessibleValueGetMinimumIncrement;
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}
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#endif
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