1/* 2 * Copyright (C) 2011, 2012 Igalia S.L. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 */ 19 20#include "config.h" 21#include "WebKitAccessibleInterfaceValue.h" 22 23#if HAVE(ACCESSIBILITY) 24 25#include "AccessibilityObject.h" 26#include "HTMLNames.h" 27#include "WebKitAccessibleWrapperAtk.h" 28 29using namespace WebCore; 30 31static AccessibilityObject* core(AtkValue* value) 32{ 33 if (!WEBKIT_IS_ACCESSIBLE(value)) 34 return 0; 35 36 return webkitAccessibleGetAccessibilityObject(WEBKIT_ACCESSIBLE(value)); 37} 38 39static void webkitAccessibleValueGetCurrentValue(AtkValue* value, GValue* gValue) 40{ 41 memset(gValue, 0, sizeof(GValue)); 42 g_value_init(gValue, G_TYPE_FLOAT); 43 g_value_set_float(gValue, core(value)->valueForRange()); 44} 45 46static void webkitAccessibleValueGetMaximumValue(AtkValue* value, GValue* gValue) 47{ 48 memset(gValue, 0, sizeof(GValue)); 49 g_value_init(gValue, G_TYPE_FLOAT); 50 g_value_set_float(gValue, core(value)->maxValueForRange()); 51} 52 53static void webkitAccessibleValueGetMinimumValue(AtkValue* value, GValue* gValue) 54{ 55 memset(gValue, 0, sizeof(GValue)); 56 g_value_init(gValue, G_TYPE_FLOAT); 57 g_value_set_float(gValue, core(value)->minValueForRange()); 58} 59 60static gboolean webkitAccessibleValueSetCurrentValue(AtkValue* value, const GValue* gValue) 61{ 62 double newValue; 63 if (G_VALUE_HOLDS_DOUBLE(gValue)) 64 newValue = g_value_get_double(gValue); 65 else if (G_VALUE_HOLDS_FLOAT(gValue)) 66 newValue = g_value_get_float(gValue); 67 else if (G_VALUE_HOLDS_INT64(gValue)) 68 newValue = g_value_get_int64(gValue); 69 else if (G_VALUE_HOLDS_INT(gValue)) 70 newValue = g_value_get_int(gValue); 71 else if (G_VALUE_HOLDS_LONG(gValue)) 72 newValue = g_value_get_long(gValue); 73 else if (G_VALUE_HOLDS_ULONG(gValue)) 74 newValue = g_value_get_ulong(gValue); 75 else if (G_VALUE_HOLDS_UINT64(gValue)) 76 newValue = g_value_get_uint64(gValue); 77 else if (G_VALUE_HOLDS_UINT(gValue)) 78 newValue = g_value_get_uint(gValue); 79 else 80 return false; 81 82 AccessibilityObject* coreObject = core(value); 83 if (!coreObject->canSetValueAttribute()) 84 return FALSE; 85 86 // Check value against range limits 87 newValue = std::max(static_cast<double>(coreObject->minValueForRange()), newValue); 88 newValue = std::min(static_cast<double>(coreObject->maxValueForRange()), newValue); 89 90 coreObject->setValue(String::number(newValue)); 91 return TRUE; 92} 93 94static void webkitAccessibleValueGetMinimumIncrement(AtkValue* value, GValue* gValue) 95{ 96 memset(gValue, 0, sizeof(GValue)); 97 g_value_init(gValue, G_TYPE_FLOAT); 98 99 AccessibilityObject* coreObject = core(value); 100 if (!coreObject->getAttribute(HTMLNames::stepAttr).isEmpty()) { 101 g_value_set_float(gValue, coreObject->stepValueForRange()); 102 return; 103 } 104 105 // If 'step' attribute is not defined, WebCore assumes a 5% of the 106 // range between minimum and maximum values, so return that. 107 float range = coreObject->maxValueForRange() - coreObject->minValueForRange(); 108 g_value_set_float(gValue, range * 0.05); 109} 110 111void webkitAccessibleValueInterfaceInit(AtkValueIface* iface) 112{ 113 iface->get_current_value = webkitAccessibleValueGetCurrentValue; 114 iface->get_maximum_value = webkitAccessibleValueGetMaximumValue; 115 iface->get_minimum_value = webkitAccessibleValueGetMinimumValue; 116 iface->set_current_value = webkitAccessibleValueSetCurrentValue; 117 iface->get_minimum_increment = webkitAccessibleValueGetMinimumIncrement; 118} 119 120#endif 121