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6\section{\class{wxAccessible}}\label{wxaccessible}
7
8The wxAccessible class allows wxWindows applications, and
9wxWindows itself, to return extended information about user interface elements
10to client applications such as screen readers. This is the
11main way in which wxWindows implements accessibility features.
12
13At present, only Microsoft Active Accessibility is supported
14by this class.
15
16To use this class, derive from wxAccessible, implement appropriate
17functions, and associate an object of the class with a
18window using \helpref{wxWindow::SetAccessible}{wxwindowsetaccessible}.
19
20All functions return an indication of success, failure, or not implemented
21using values of the wxAccStatus enum type.
22
23If you return wxACC\_NOT\_IMPLEMENTED from any functioon, the system will try to
24implement the appropriate functionality. However this will not work with
25all functions.
26
27Most functions work with an {\it object id}, which can be zero to refer to
28'this' UI element, or greater than zero to refer to the nth child element.
29This allows you to specify elements that don't have a corresponding wxWindow or
30wxAccessible; for example, the sash of a splitter window.
31
32For details on the semantics of functions and types, please refer to the
33Microsoft Active Accessibility 1.2 documentation.
34
35This class is compiled into wxWindows only if the wxUSE\_ACCESSIBILITY setup
36symbol is set to 1.
37
38\wxheading{Derived from}
39
40\helpref{wxObject}{wxobject}
41
42\wxheading{Include files}
43
44<wx/access.h>
45
46\wxheading{Data structures}
47
48Functions return a wxAccStatus error code, which
49may be one of the following:
50
51{\small \begin{verbatim}
52typedef enum
53{
54 wxACC\_FAIL, // The function failed
55 wxACC\_FALSE, // The function returned false
56 wxACC\_OK, // The function completed successfully
57 wxACC\_NOT\_IMPLEMENTED, // The function is not implemented
58 wxACC\_NOT\_SUPPORTED // The function is not supported
59} wxAccStatus
60\end{verbatim}}
61
62Directions of navigation are represented by
63the following:
64
65{\small \begin{verbatim}
66typedef enum
67{
68 wxNAVDIR\_DOWN,
69 wxNAVDIR\_FIRSTCHILD,
70 wxNAVDIR\_LASTCHILD,
71 wxNAVDIR\_LEFT,
72 wxNAVDIR\_NEXT,
73 wxNAVDIR\_PREVIOUS,
74 wxNAVDIR\_RIGHT,
75 wxNAVDIR\_UP
76} wxNavDir
77\end{verbatim}}
78
79The role of a user interface element is represented
80by the following type:
81
82{\small \begin{verbatim}
83typedef enum {
84 wxROLE\_NONE,
85 wxROLE\_SYSTEM\_ALERT,
86 wxROLE\_SYSTEM\_ANIMATION,
87 wxROLE\_SYSTEM\_APPLICATION,
88 wxROLE\_SYSTEM\_BORDER,
89 wxROLE\_SYSTEM\_BUTTONDROPDOWN,
90 wxROLE\_SYSTEM\_BUTTONDROPDOWNGRID,
91 wxROLE\_SYSTEM\_BUTTONMENU,
92 wxROLE\_SYSTEM\_CARET,
93 wxROLE\_SYSTEM\_CELL,
94 wxROLE\_SYSTEM\_CHARACTER,
95 wxROLE\_SYSTEM\_CHART,
96 wxROLE\_SYSTEM\_CHECKBUTTON,
97 wxROLE\_SYSTEM\_CLIENT,
98 wxROLE\_SYSTEM\_CLOCK,
99 wxROLE\_SYSTEM\_COLUMN,
100 wxROLE\_SYSTEM\_COLUMNHEADER,
101 wxROLE\_SYSTEM\_COMBOBOX,
102 wxROLE\_SYSTEM\_CURSOR,
103 wxROLE\_SYSTEM\_DIAGRAM,
104 wxROLE\_SYSTEM\_DIAL,
105 wxROLE\_SYSTEM\_DIALOG,
106 wxROLE\_SYSTEM\_DOCUMENT,
107 wxROLE\_SYSTEM\_DROPLIST,
108 wxROLE\_SYSTEM\_EQUATION,
109 wxROLE\_SYSTEM\_GRAPHIC,
110 wxROLE\_SYSTEM\_GRIP,
111 wxROLE\_SYSTEM\_GROUPING,
112 wxROLE\_SYSTEM\_HELPBALLOON,
113 wxROLE\_SYSTEM\_HOTKEYFIELD,
114 wxROLE\_SYSTEM\_INDICATOR,
115 wxROLE\_SYSTEM\_LINK,
116 wxROLE\_SYSTEM\_LIST,
117 wxROLE\_SYSTEM\_LISTITEM,
118 wxROLE\_SYSTEM\_MENUBAR,
119 wxROLE\_SYSTEM\_MENUITEM,
120 wxROLE\_SYSTEM\_MENUPOPUP,
121 wxROLE\_SYSTEM\_OUTLINE,
122 wxROLE\_SYSTEM\_OUTLINEITEM,
123 wxROLE\_SYSTEM\_PAGETAB,
124 wxROLE\_SYSTEM\_PAGETABLIST,
125 wxROLE\_SYSTEM\_PANE,
126 wxROLE\_SYSTEM\_PROGRESSBAR,
127 wxROLE\_SYSTEM\_PROPERTYPAGE,
128 wxROLE\_SYSTEM\_PUSHBUTTON,
129 wxROLE\_SYSTEM\_RADIOBUTTON,
130 wxROLE\_SYSTEM\_ROW,
131 wxROLE\_SYSTEM\_ROWHEADER,
132 wxROLE\_SYSTEM\_SCROLLBAR,
133 wxROLE\_SYSTEM\_SEPARATOR,
134 wxROLE\_SYSTEM\_SLIDER,
135 wxROLE\_SYSTEM\_SOUND,
136 wxROLE\_SYSTEM\_SPINBUTTON,
137 wxROLE\_SYSTEM\_STATICTEXT,
138 wxROLE\_SYSTEM\_STATUSBAR,
139 wxROLE\_SYSTEM\_TABLE,
140 wxROLE\_SYSTEM\_TEXT,
141 wxROLE\_SYSTEM\_TITLEBAR,
142 wxROLE\_SYSTEM\_TOOLBAR,
143 wxROLE\_SYSTEM\_TOOLTIP,
144 wxROLE\_SYSTEM\_WHITESPACE,
145 wxROLE\_SYSTEM\_WINDOW
146} wxAccRole
147\end{verbatim}}
148
149Objects are represented by the following type:
150
151{\small \begin{verbatim}
152typedef enum {
153 wxOBJID\_WINDOW = 0x00000000,
154 wxOBJID\_SYSMENU = 0xFFFFFFFF,
155 wxOBJID\_TITLEBAR = 0xFFFFFFFE,
156 wxOBJID\_MENU = 0xFFFFFFFD,
157 wxOBJID\_CLIENT = 0xFFFFFFFC,
158 wxOBJID\_VSCROLL = 0xFFFFFFFB,
159 wxOBJID\_HSCROLL = 0xFFFFFFFA,
160 wxOBJID\_SIZEGRIP = 0xFFFFFFF9,
161 wxOBJID\_CARET = 0xFFFFFFF8,
162 wxOBJID\_CURSOR = 0xFFFFFFF7,
163 wxOBJID\_ALERT = 0xFFFFFFF6,
164 wxOBJID\_SOUND = 0xFFFFFFF5
165} wxAccObject
166\end{verbatim}}
167
168Selection actions are identified by
169this type:
170
171{\small \begin{verbatim}
172typedef enum
173{
174 wxACC\_SEL\_NONE = 0,
175 wxACC\_SEL\_TAKEFOCUS = 1,
176 wxACC\_SEL\_TAKESELECTION = 2,
177 wxACC\_SEL\_EXTENDSELECTION = 4,
178 wxACC\_SEL\_ADDSELECTION = 8,
179 wxACC\_SEL\_REMOVESELECTION = 16
180} wxAccSelectionFlags
181\end{verbatim}}
182
183States are represented by the following:
184
185{\small \begin{verbatim}
186#define wxACC\_STATE\_SYSTEM\_ALERT\_HIGH 0x00000001
187#define wxACC\_STATE\_SYSTEM\_ALERT\_MEDIUM 0x00000002
188#define wxACC\_STATE\_SYSTEM\_ALERT\_LOW 0x00000004
189#define wxACC\_STATE\_SYSTEM\_ANIMATED 0x00000008
190#define wxACC\_STATE\_SYSTEM\_BUSY 0x00000010
191#define wxACC\_STATE\_SYSTEM\_CHECKED 0x00000020
192#define wxACC\_STATE\_SYSTEM\_COLLAPSED 0x00000040
193#define wxACC\_STATE\_SYSTEM\_DEFAULT 0x00000080
194#define wxACC\_STATE\_SYSTEM\_EXPANDED 0x00000100
195#define wxACC\_STATE\_SYSTEM\_EXTSELECTABLE 0x00000200
196#define wxACC\_STATE\_SYSTEM\_FLOATING 0x00000400
197#define wxACC\_STATE\_SYSTEM\_FOCUSABLE 0x00000800
198#define wxACC\_STATE\_SYSTEM\_FOCUSED 0x00001000
199#define wxACC\_STATE\_SYSTEM\_HOTTRACKED 0x00002000
200#define wxACC\_STATE\_SYSTEM\_INVISIBLE 0x00004000
201#define wxACC\_STATE\_SYSTEM\_MARQUEED 0x00008000
202#define wxACC\_STATE\_SYSTEM\_MIXED 0x00010000
203#define wxACC\_STATE\_SYSTEM\_MULTISELECTABLE 0x00020000
204#define wxACC\_STATE\_SYSTEM\_OFFSCREEN 0x00040000
205#define wxACC\_STATE\_SYSTEM\_PRESSED 0x00080000
206#define wxACC\_STATE\_SYSTEM\_PROTECTED 0x00100000
207#define wxACC\_STATE\_SYSTEM\_READONLY 0x00200000
208#define wxACC\_STATE\_SYSTEM\_SELECTABLE 0x00400000
209#define wxACC\_STATE\_SYSTEM\_SELECTED 0x00800000
210#define wxACC\_STATE\_SYSTEM\_SELFVOICING 0x01000000
211#define wxACC\_STATE\_SYSTEM\_UNAVAILABLE 0x02000000
212\end{verbatim}}
213
214Event identifiers that can be sent via \helpref{wxAccessible::NotifyEvent}{wxaccessiblenotifyevent} are
215as follows:
216
217{\small \begin{verbatim}
218#define wxACC\_EVENT\_SYSTEM\_SOUND 0x0001
219#define wxACC\_EVENT\_SYSTEM\_ALERT 0x0002
220#define wxACC\_EVENT\_SYSTEM\_FOREGROUND 0x0003
221#define wxACC\_EVENT\_SYSTEM\_MENUSTART 0x0004
222#define wxACC\_EVENT\_SYSTEM\_MENUEND 0x0005
223#define wxACC\_EVENT\_SYSTEM\_MENUPOPUPSTART 0x0006
224#define wxACC\_EVENT\_SYSTEM\_MENUPOPUPEND 0x0007
225#define wxACC\_EVENT\_SYSTEM\_CAPTURESTART 0x0008
226#define wxACC\_EVENT\_SYSTEM\_CAPTUREEND 0x0009
227#define wxACC\_EVENT\_SYSTEM\_MOVESIZESTART 0x000A
228#define wxACC\_EVENT\_SYSTEM\_MOVESIZEEND 0x000B
229#define wxACC\_EVENT\_SYSTEM\_CONTEXTHELPSTART 0x000C
230#define wxACC\_EVENT\_SYSTEM\_CONTEXTHELPEND 0x000D
231#define wxACC\_EVENT\_SYSTEM\_DRAGDROPSTART 0x000E
232#define wxACC\_EVENT\_SYSTEM\_DRAGDROPEND 0x000F
233#define wxACC\_EVENT\_SYSTEM\_DIALOGSTART 0x0010
234#define wxACC\_EVENT\_SYSTEM\_DIALOGEND 0x0011
235#define wxACC\_EVENT\_SYSTEM\_SCROLLINGSTART 0x0012
236#define wxACC\_EVENT\_SYSTEM\_SCROLLINGEND 0x0013
237#define wxACC\_EVENT\_SYSTEM\_SWITCHSTART 0x0014
238#define wxACC\_EVENT\_SYSTEM\_SWITCHEND 0x0015
239#define wxACC\_EVENT\_SYSTEM\_MINIMIZESTART 0x0016
240#define wxACC\_EVENT\_SYSTEM\_MINIMIZEEND 0x0017
241#define wxACC\_EVENT\_OBJECT\_CREATE 0x8000
242#define wxACC\_EVENT\_OBJECT\_DESTROY 0x8001
243#define wxACC\_EVENT\_OBJECT\_SHOW 0x8002
244#define wxACC\_EVENT\_OBJECT\_HIDE 0x8003
245#define wxACC\_EVENT\_OBJECT\_REORDER 0x8004
246#define wxACC\_EVENT\_OBJECT\_FOCUS 0x8005
247#define wxACC\_EVENT\_OBJECT\_SELECTION 0x8006
248#define wxACC\_EVENT\_OBJECT\_SELECTIONADD 0x8007
249#define wxACC\_EVENT\_OBJECT\_SELECTIONREMOVE 0x8008
250#define wxACC\_EVENT\_OBJECT\_SELECTIONWITHIN 0x8009
251#define wxACC\_EVENT\_OBJECT\_STATECHANGE 0x800A
252#define wxACC\_EVENT\_OBJECT\_LOCATIONCHANGE 0x800B
253#define wxACC\_EVENT\_OBJECT\_NAMECHANGE 0x800C
254#define wxACC\_EVENT\_OBJECT\_DESCRIPTIONCHANGE 0x800D
255#define wxACC\_EVENT\_OBJECT\_VALUECHANGE 0x800E
256#define wxACC\_EVENT\_OBJECT\_PARENTCHANGE 0x800F
257#define wxACC\_EVENT\_OBJECT\_HELPCHANGE 0x8010
258#define wxACC\_EVENT\_OBJECT\_DEFACTIONCHANGE 0x8011
259#define wxACC\_EVENT\_OBJECT\_ACCELERATORCHANGE 0x8012
260\end{verbatim}}
261
262\latexignore{\rtfignore{\wxheading{Members}}}
263
264\membersection{wxAccessible::wxAccessible}\label{wxaccessiblewxaccessible}
265
266\func{}{wxAccessible}{\param{wxWindow* }{win = NULL}}
267
268Constructor, taking an optional window. The object can be associated with
269a window later.
270
271\membersection{wxAccessible::\destruct{wxAccessible}}\label{wxaccessibledtor}
272
273\func{}{\destruct{wxAccessible}}{\void}
274
275Destructor.
276
277\membersection{wxAccessible::DoDefaultAction}\label{wxaccessibledodefaultaction}
278
279\func{virtual wxAccStatus}{DoDefaultAction}{\param{int }{childId}}
280
281Performs the default action for the object. {\it childId} is 0 (the action for this object)
282or greater than 0 (the action for a child). Return wxACC\_NOT\_SUPPORTED if there
283is no default action for this window (e.g. an edit control).
284
285\membersection{wxAccessible::GetChild}\label{wxaccessiblegetchild}
286
287\func{virtual wxAccStatus}{GetChild}{\param{int }{childId}, \param{wxAccessible** }{child}}
288
289Gets the specified child (starting from 1). If {\it child} is NULL and the return value is wxACC\_OK,
290this means that the child is a simple element and not an accessible object.
291
292\membersection{wxAccessible::GetChildCount}\label{wxaccessiblegetchildcount}
293
a37e4a07 294\func{virtual wxAccStatus}{GetChildCount}{\param{int* }{childCount}}
2dab56e9 295
a37e4a07 296Returns the number of children in {\it childCount}.
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297
298\membersection{wxAccessible::GetDefaultAction}\label{wxaccessiblegetdefaultaction}
299
300\func{virtual wxAccStatus}{GetDefaultAction}{\param{int }{childId}, \param{wxString* }{actionName}}
301
302Gets the default action for this object (0) or a child (greater than 0).
303Return wxACC\_OK even if there is no action. {\it actionName} is the action, or the empty
304string if there is no action. The retrieved string describes the action that is performed on an object,
305not what the object does as a result. For example, a toolbar button that prints
306a document has a default action of "Press" rather than "Prints the current document."
307
308\membersection{wxAccessible::GetDescription}\label{wxaccessiblegetdescription}
309
310\func{virtual wxAccStatus}{GetDescription}{\param{int }{childId}, \param{wxString* }{description}}
311
312Returns the description for this object or a child.
313
314\membersection{wxAccessible::GetFocus}\label{wxaccessiblegetfocus}
315
316\func{virtual wxAccStatus}{GetFocus}{\param{int* }{childId}, \param{wxAccessible** }{child}}
317
318Gets the window with the keyboard focus. If childId is 0 and child is NULL, no object in
319this subhierarchy has the focus. If this object has the focus, child should be 'this'.
320
321\membersection{wxAccessible::GetHelpText}\label{wxaccessiblegethelptext}
322
323\func{virtual wxAccStatus}{GetHelpText}{\param{int }{childId}, \param{wxString* }{helpText}}
324
325Returns help text for this object or a child, similar to tooltip text.
326
327\membersection{wxAccessible::GetKeyboardShortcut}\label{wxaccessiblegetkeyboardshortcut}
328
329\func{virtual wxAccStatus}{GetKeyboardShortcut}{\param{int }{childId}, \param{wxString* }{shortcut}}
330
331Returns the keyboard shortcut for this object or child.
332Return e.g. ALT+K.
333
334\membersection{wxAccessible::GetLocation}\label{wxaccessiblegetlocation}
335
336\func{virtual wxAccStatus}{GetLocation}{\param{wxRect\& }{rect}, \param{int }{elementId}}
337
338Returns the rectangle for this object (id is 0) or a child element (id is greater than 0).
a37e4a07 339{\it rect} is in screen coordinates.
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340
341\membersection{wxAccessible::GetName}\label{wxaccessiblegetname}
342
343\func{virtual wxAccStatus}{GetName}{\param{int }{childId}, \param{wxString* }{name}}
344
345Gets the name of the specified object.
346
347\membersection{wxAccessible::GetParent}\label{wxaccessiblegetparent}
348
349\func{virtual wxAccStatus}{GetParent}{\param{wxAccessible** }{parent}}
350
351Returns the parent of this object, or NULL.
352
353\membersection{wxAccessible::GetRole}\label{wxaccessiblegetrole}
354
355\func{virtual wxAccStatus}{GetRole}{\param{int }{childId}, \param{wxAccRole* }{role}}
356
357Returns a role constant describing this object. See \helpref{wxAccessible}{wxaccessible} for a list
358of these roles.
359
360\membersection{wxAccessible::GetSelections}\label{wxaccessiblegetselections}
361
362\func{virtual wxAccStatus}{GetSelections}{\param{wxVariant* }{selections}}
363
364Gets a variant representing the selected children
365of this object.
366
367Acceptable values are:
368
369\begin{itemize}
370\item a null variant (IsNull() returns TRUE)
371\item a list variant (GetType() == wxT("list"))
372\item an integer representing the selected child element,
373or 0 if this object is selected (GetType() == wxT("long"))
374\item a "void*" pointer to a wxAccessible child object
375\end{itemize}
376
377\membersection{wxAccessible::GetState}\label{wxaccessiblegetstate}
378
379\func{virtual wxAccStatus}{GetState}{\param{int }{childId}, \param{long* }{state}}
380
381Returns a state constant. See \helpref{wxAccessible}{wxaccessible} for a list
382of these states.
383
384\membersection{wxAccessible::GetValue}\label{wxaccessiblegetvalue}
385
386\func{virtual wxAccStatus}{GetValue}{\param{int }{childId}, \param{wxString* }{strValue}}
387
388Returns a localized string representing the value for the object
389or child.
390
391\membersection{wxAccessible::GetWindow}\label{wxaccessiblegetwindow}
392
393\func{wxWindow*}{GetWindow}{\void}
394
395Returns the window associated with this object.
396
397\membersection{wxAccessible::HitTest}\label{wxaccessiblehittest}
398
399\func{virtual wxAccStatus}{HitTest}{\param{const wxPoint\& }{pt}, \param{int* }{childId}, \param{wxAccessible** }{childObject}}
400
401Returns a status value and object id to indicate whether the given point was on this or
402a child object. Can return either a child object, or an integer
403representing the child element, starting from 1.
404
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405{\it pt} is in screen coordinates.
406
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407\membersection{wxAccessible::Navigate}\label{wxaccessiblenavigate}
408
409\func{virtual wxAccStatus}{Navigate}{\param{wxNavDir }{navDir}, \param{int }{fromId}, \param{int* }{toId}, \param{wxAccessible** }{toObject}}
410
411Navigates from {\it fromId} to {\it toId}/{\it toObject}.
412
e415391a 413\membersection{wxAccessible::NotifyEvent}\label{wxaccessiblenotifyevent}
2dab56e9 414
e415391a 415\func{virtual static void}{NotifyEvent}{\param{int}{ eventType}, \param{wxWindow* }{window}, \param{wxAccObjectt }{objectType}, \param{int }{objectType}}
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416
417Allows the application to send an event when something changes in an accessible object.
418
419\membersection{wxAccessible::Select}\label{wxaccessibleselect}
420
421\func{virtual wxAccStatus}{Select}{\param{int }{childId}, \param{wxAccSelectionFlags }{selectFlags}}
422
423Selects the object or child. See \helpref{wxAccessible}{wxaccessible} for a list
424of the selection actions.
425
426\membersection{wxAccessible::SetWindow}\label{wxaccessiblesetwindow}
427
428\func{void}{SetWindow}{\param{wxWindow* }{window}}
429
430Sets the window associated with this object.
431