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comparison: accessible/src/base/nsAccUtils.h

accessible/src/base/nsAccUtils.h

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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 #ifndef nsAccUtils_h_
7 #define nsAccUtils_h_
8
9 #include "mozilla/a11y/Accessible.h"
10
11 #include "nsAccessibilityService.h"
12 #include "nsCoreUtils.h"
13
14 #include "nsIDocShell.h"
15 #include "nsPoint.h"
16
17 namespace mozilla {
18
19 namespace dom {
20 class Element;
21 }
22
23 namespace a11y {
24
25 class HyperTextAccessible;
26 class DocAccessible;
27
28 class nsAccUtils
29 {
30 public:
31 /**
32 * Returns value of attribute from the given attributes container.
33 *
34 * @param aAttributes - attributes container
35 * @param aAttrName - the name of requested attribute
36 * @param aAttrValue - value of attribute
37 */
38 static void GetAccAttr(nsIPersistentProperties *aAttributes,
39 nsIAtom *aAttrName,
40 nsAString& aAttrValue);
41
42 /**
43 * Set value of attribute for the given attributes container.
44 *
45 * @param aAttributes - attributes container
46 * @param aAttrName - the name of requested attribute
47 * @param aAttrValue - new value of attribute
48 */
49 static void SetAccAttr(nsIPersistentProperties *aAttributes,
50 nsIAtom *aAttrName,
51 const nsAString& aAttrValue);
52
53 /**
54 * Set group attributes ('level', 'setsize', 'posinset').
55 */
56 static void SetAccGroupAttrs(nsIPersistentProperties *aAttributes,
57 int32_t aLevel, int32_t aSetSize,
58 int32_t aPosInSet);
59
60 /**
61 * Get default value of the level for the given accessible.
62 */
63 static int32_t GetDefaultLevel(Accessible* aAcc);
64
65 /**
66 * Return ARIA level value or the default one if ARIA is missed for the
67 * given accessible.
68 */
69 static int32_t GetARIAOrDefaultLevel(Accessible* aAccessible);
70
71 /**
72 * Compute group level for nsIDOMXULContainerItemElement node.
73 */
74 static int32_t GetLevelForXULContainerItem(nsIContent *aContent);
75
76 /**
77 * Set container-foo live region attributes for the given node.
78 *
79 * @param aAttributes where to store the attributes
80 * @param aStartContent node to start from
81 * @param aTopContent node to end at
82 */
83 static void SetLiveContainerAttributes(nsIPersistentProperties *aAttributes,
84 nsIContent *aStartContent,
85 nsIContent *aTopContent);
86
87 /**
88 * Any ARIA property of type boolean or NMTOKEN is undefined if the ARIA
89 * property is not present, or is "" or "undefined". Do not call
90 * this method for properties of type string, decimal, IDREF or IDREFS.
91 *
92 * Return true if the ARIA property is defined, otherwise false
93 */
94 static bool HasDefinedARIAToken(nsIContent *aContent, nsIAtom *aAtom);
95
96 /**
97 * Return atomic value of ARIA attribute of boolean or NMTOKEN type.
98 */
99 static nsIAtom* GetARIAToken(mozilla::dom::Element* aElement, nsIAtom* aAttr);
100
101 /**
102 * Return document accessible for the given DOM node.
103 */
104 static DocAccessible* GetDocAccessibleFor(nsINode* aNode)
105 {
106 nsIPresShell *presShell = nsCoreUtils::GetPresShellFor(aNode);
107 return GetAccService()->GetDocAccessible(presShell);
108 }
109
110 /**
111 * Return document accessible for the given docshell.
112 */
113 static DocAccessible* GetDocAccessibleFor(nsIDocShellTreeItem* aContainer)
114 {
115 nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(aContainer));
116 return GetAccService()->GetDocAccessible(docShell->GetPresShell());
117 }
118
119 /**
120 * Return single or multi selectable container for the given item.
121 *
122 * @param aAccessible [in] the item accessible
123 * @param aState [in] the state of the item accessible
124 */
125 static Accessible* GetSelectableContainer(Accessible* aAccessible,
126 uint64_t aState);
127
128 /**
129 * Return a text container accessible for the given node.
130 */
131 static HyperTextAccessible* GetTextContainer(nsINode* aNode);
132
133 /**
134 * Return true if the DOM node of given accessible has aria-selected="true"
135 * attribute.
136 */
137 static bool IsARIASelected(Accessible* aAccessible);
138
139 /**
140 * Converts the given coordinates to coordinates relative screen.
141 *
142 * @param aX [in] the given x coord
143 * @param aY [in] the given y coord
144 * @param aCoordinateType [in] specifies coordinates origin (refer to
145 * nsIAccessibleCoordinateType)
146 * @param aAccessible [in] the accessible if coordinates are given
147 * relative it.
148 * @return converted coordinates
149 */
150 static nsIntPoint ConvertToScreenCoords(int32_t aX, int32_t aY,
151 uint32_t aCoordinateType,
152 Accessible* aAccessible);
153
154 /**
155 * Converts the given coordinates relative screen to another coordinate
156 * system.
157 *
158 * @param aX [in, out] the given x coord
159 * @param aY [in, out] the given y coord
160 * @param aCoordinateType [in] specifies coordinates origin (refer to
161 * nsIAccessibleCoordinateType)
162 * @param aAccessible [in] the accessible if coordinates are given
163 * relative it
164 */
165 static void ConvertScreenCoordsTo(int32_t* aX, int32_t* aY,
166 uint32_t aCoordinateType,
167 Accessible* aAccessible);
168
169 /**
170 * Returns coordinates relative screen for the parent of the given accessible.
171 *
172 * @param [in] aAccessible the accessible
173 */
174 static nsIntPoint GetScreenCoordsForParent(Accessible* aAccessible);
175
176 /**
177 * Get the 'live' or 'container-live' object attribute value from the given
178 * ELiveAttrRule constant.
179 *
180 * @param aRule [in] rule constant (see ELiveAttrRule in nsAccMap.h)
181 * @param aValue [out] object attribute value
182 *
183 * @return true if object attribute should be exposed
184 */
185 static bool GetLiveAttrValue(uint32_t aRule, nsAString& aValue);
186
187 #ifdef DEBUG
188 /**
189 * Detect whether the given accessible object implements nsIAccessibleText,
190 * when it is text or has text child node.
191 */
192 static bool IsTextInterfaceSupportCorrect(Accessible* aAccessible);
193 #endif
194
195 /**
196 * Return text length of the given accessible, return 0 on failure.
197 */
198 static uint32_t TextLength(Accessible* aAccessible);
199
200 /**
201 * Return true if the given accessible is embedded object.
202 */
203 static bool IsEmbeddedObject(Accessible* aAcc)
204 {
205 uint32_t role = aAcc->Role();
206 return role != roles::TEXT_LEAF &&
207 role != roles::WHITESPACE &&
208 role != roles::STATICTEXT;
209 }
210
211 /**
212 * Transform nsIAccessibleStates constants to internal state constant.
213 */
214 static inline uint64_t To64State(uint32_t aState1, uint32_t aState2)
215 {
216 return static_cast<uint64_t>(aState1) +
217 (static_cast<uint64_t>(aState2) << 31);
218 }
219
220 /**
221 * Transform internal state constant to nsIAccessibleStates constants.
222 */
223 static inline void To32States(uint64_t aState64,
224 uint32_t* aState1, uint32_t* aState2)
225 {
226 *aState1 = aState64 & 0x7fffffff;
227 if (aState2)
228 *aState2 = static_cast<uint32_t>(aState64 >> 31);
229 }
230
231 static uint32_t To32States(uint64_t aState, bool* aIsExtra)
232 {
233 uint32_t extraState = aState >> 31;
234 *aIsExtra = !!extraState;
235 return aState | extraState;
236 }
237
238 /**
239 * Return true if the given accessible can't have children. Used when exposing
240 * to platform accessibility APIs, should the children be pruned off?
241 */
242 static bool MustPrune(Accessible* aAccessible);
243 };
244
245 } // namespace a11y
246 } // namespace mozilla
247
248 #endif

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