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 "WebKitAccessible.h"
28#include "WebKitAccessibleUtil.h"
29#include <wtf/text/CString.h>
30
31using namespace WebCore;
32
33static AccessibilityObject* core(AtkValue* value)
34{
35 if (!WEBKIT_IS_ACCESSIBLE(value))
36 return 0;
37
38 return &webkitAccessibleGetAccessibilityObject(WEBKIT_ACCESSIBLE(value));
39}
40
41static bool webkitAccessibleSetNewValue(AtkValue* coreValue, const gdouble newValue)
42{
43 AccessibilityObject* coreObject = core(coreValue);
44 if (!coreObject->canSetValueAttribute())
45 return FALSE;
46
47 // Check value against range limits
48 double value;
49 value = std::max(static_cast<double>(coreObject->minValueForRange()), newValue);
50 value = std::min(static_cast<double>(coreObject->maxValueForRange()), newValue);
51
52 coreObject->setValue(String::numberToStringFixedPrecision(value));
53 return TRUE;
54}
55
56static float webkitAccessibleGetIncrementValue(AccessibilityObject* coreObject)
57{
58 if (!coreObject->getAttribute(HTMLNames::stepAttr).isEmpty())
59 return coreObject->stepValueForRange();
60
61 // If 'step' attribute is not defined, WebCore assumes a 5% of the
62 // range between minimum and maximum values. Implicit value of step should be one or larger.
63 float step = (coreObject->maxValueForRange() - coreObject->minValueForRange()) * 0.05;
64 return step < 1 ? 1 : step;
65}
66
67#if ATK_CHECK_VERSION(2,11,92)
68static void webkitAccessibleGetValueAndText(AtkValue* value, gdouble* currentValue, gchar** alternativeText)
69{
70 g_return_if_fail(ATK_VALUE(value));
71 returnIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value));
72
73 AccessibilityObject* coreObject = core(value);
74 if (!coreObject)
75 return;
76
77 if (currentValue)
78 *currentValue = coreObject->valueForRange();
79 if (alternativeText)
80 *alternativeText = g_strdup_printf("%s", coreObject->valueDescription().utf8().data());
81}
82
83static double webkitAccessibleGetIncrement(AtkValue* value)
84{
85 g_return_val_if_fail(ATK_VALUE(value), 0);
86 returnValIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value), 0);
87
88 AccessibilityObject* coreObject = core(value);
89 if (!coreObject)
90 return 0;
91
92 return webkitAccessibleGetIncrementValue(coreObject);
93}
94
95static void webkitAccessibleSetValue(AtkValue* value, const gdouble newValue)
96{
97 g_return_if_fail(ATK_VALUE(value));
98 returnIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value));
99
100 webkitAccessibleSetNewValue(value, newValue);
101}
102
103static AtkRange* webkitAccessibleGetRange(AtkValue* value)
104{
105 g_return_val_if_fail(ATK_VALUE(value), nullptr);
106 returnValIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value), nullptr);
107
108 AccessibilityObject* coreObject = core(value);
109 if (!coreObject)
110 return nullptr;
111
112 gdouble minValue = coreObject->minValueForRange();
113 gdouble maxValue = coreObject->maxValueForRange();
114 gchar* valueDescription = g_strdup_printf("%s", coreObject->valueDescription().utf8().data());
115 return atk_range_new(minValue, maxValue, valueDescription);
116}
117#endif
118static void webkitAccessibleValueGetCurrentValue(AtkValue* value, GValue* gValue)
119{
120 g_return_if_fail(ATK_VALUE(value));
121 returnIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value));
122
123 memset(gValue, 0, sizeof(GValue));
124 g_value_init(gValue, G_TYPE_FLOAT);
125 g_value_set_float(gValue, core(value)->valueForRange());
126}
127
128static void webkitAccessibleValueGetMaximumValue(AtkValue* value, GValue* gValue)
129{
130 g_return_if_fail(ATK_VALUE(value));
131 returnIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value));
132
133 memset(gValue, 0, sizeof(GValue));
134 g_value_init(gValue, G_TYPE_FLOAT);
135 g_value_set_float(gValue, core(value)->maxValueForRange());
136}
137
138static void webkitAccessibleValueGetMinimumValue(AtkValue* value, GValue* gValue)
139{
140 g_return_if_fail(ATK_VALUE(value));
141 returnIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value));
142
143 memset(gValue, 0, sizeof(GValue));
144 g_value_init(gValue, G_TYPE_FLOAT);
145 g_value_set_float(gValue, core(value)->minValueForRange());
146}
147
148static gboolean webkitAccessibleValueSetCurrentValue(AtkValue* value, const GValue* gValue)
149{
150 g_return_val_if_fail(ATK_VALUE(value), FALSE);
151 returnValIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value), FALSE);
152
153 double newValue;
154 if (G_VALUE_HOLDS_DOUBLE(gValue))
155 newValue = g_value_get_double(gValue);
156 else if (G_VALUE_HOLDS_FLOAT(gValue))
157 newValue = g_value_get_float(gValue);
158 else if (G_VALUE_HOLDS_INT64(gValue))
159 newValue = g_value_get_int64(gValue);
160 else if (G_VALUE_HOLDS_INT(gValue))
161 newValue = g_value_get_int(gValue);
162 else if (G_VALUE_HOLDS_LONG(gValue))
163 newValue = g_value_get_long(gValue);
164 else if (G_VALUE_HOLDS_ULONG(gValue))
165 newValue = g_value_get_ulong(gValue);
166 else if (G_VALUE_HOLDS_UINT64(gValue))
167 newValue = g_value_get_uint64(gValue);
168 else if (G_VALUE_HOLDS_UINT(gValue))
169 newValue = g_value_get_uint(gValue);
170 else
171 return FALSE;
172
173 return webkitAccessibleSetNewValue(value, newValue);
174}
175
176static void webkitAccessibleValueGetMinimumIncrement(AtkValue* value, GValue* gValue)
177{
178 g_return_if_fail(ATK_VALUE(value));
179 returnIfWebKitAccessibleIsInvalid(WEBKIT_ACCESSIBLE(value));
180
181 memset(gValue, 0, sizeof(GValue));
182 g_value_init(gValue, G_TYPE_FLOAT);
183
184 AccessibilityObject* coreObject = core(value);
185 g_value_set_float(gValue, webkitAccessibleGetIncrementValue(coreObject));
186}
187
188void webkitAccessibleValueInterfaceInit(AtkValueIface* iface)
189{
190#if ATK_CHECK_VERSION(2,11,92)
191 iface->get_value_and_text = webkitAccessibleGetValueAndText;
192 iface->get_increment = webkitAccessibleGetIncrement;
193 iface->set_value = webkitAccessibleSetValue;
194 iface->get_range = webkitAccessibleGetRange;
195#endif
196 iface->get_current_value = webkitAccessibleValueGetCurrentValue;
197 iface->get_maximum_value = webkitAccessibleValueGetMaximumValue;
198 iface->get_minimum_value = webkitAccessibleValueGetMinimumValue;
199 iface->set_current_value = webkitAccessibleValueSetCurrentValue;
200 iface->get_minimum_increment = webkitAccessibleValueGetMinimumIncrement;
201}
202
203#endif
204