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 | |
31 | using namespace WebCore; |
32 | |
33 | static AccessibilityObject* core(AtkValue* value) |
34 | { |
35 | if (!WEBKIT_IS_ACCESSIBLE(value)) |
36 | return 0; |
37 | |
38 | return &webkitAccessibleGetAccessibilityObject(WEBKIT_ACCESSIBLE(value)); |
39 | } |
40 | |
41 | static 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 | |
56 | static 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) |
68 | static 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 | |
83 | static 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 | |
95 | static 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 | |
103 | static 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 |
118 | static 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 | |
128 | static 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 | |
138 | static 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 | |
148 | static 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 | |
176 | static 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 | |
188 | void 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 | |