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5
6\section{\class{wxAccessible}}\label{wxaccessible}
7
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8The wxAccessible class allows wxWidgets applications, and
9wxWidgets itself, to return extended information about user interface elements
2dab56e9 10to client applications such as screen readers. This is the
fc2171bd 11main way in which wxWidgets implements accessibility features.
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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
fc2171bd 35This class is compiled into wxWidgets only if the wxUSE\_ACCESSIBILITY setup
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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
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51{\small
52\begin{verbatim}
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53typedef enum
54{
55 wxACC\_FAIL, // The function failed
56 wxACC\_FALSE, // The function returned false
57 wxACC\_OK, // The function completed successfully
58 wxACC\_NOT\_IMPLEMENTED, // The function is not implemented
59 wxACC\_NOT\_SUPPORTED // The function is not supported
60} wxAccStatus
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61\end{verbatim}
62}
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63
64Directions of navigation are represented by
65the following:
66
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67{\small
68\begin{verbatim}
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69typedef enum
70{
71 wxNAVDIR\_DOWN,
72 wxNAVDIR\_FIRSTCHILD,
73 wxNAVDIR\_LASTCHILD,
74 wxNAVDIR\_LEFT,
75 wxNAVDIR\_NEXT,
76 wxNAVDIR\_PREVIOUS,
77 wxNAVDIR\_RIGHT,
78 wxNAVDIR\_UP
79} wxNavDir
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80\end{verbatim}
81}
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82
83The role of a user interface element is represented
84by the following type:
85
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86{\small
87\begin{verbatim}
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88typedef enum {
89 wxROLE\_NONE,
90 wxROLE\_SYSTEM\_ALERT,
91 wxROLE\_SYSTEM\_ANIMATION,
92 wxROLE\_SYSTEM\_APPLICATION,
93 wxROLE\_SYSTEM\_BORDER,
94 wxROLE\_SYSTEM\_BUTTONDROPDOWN,
95 wxROLE\_SYSTEM\_BUTTONDROPDOWNGRID,
96 wxROLE\_SYSTEM\_BUTTONMENU,
97 wxROLE\_SYSTEM\_CARET,
98 wxROLE\_SYSTEM\_CELL,
99 wxROLE\_SYSTEM\_CHARACTER,
100 wxROLE\_SYSTEM\_CHART,
101 wxROLE\_SYSTEM\_CHECKBUTTON,
102 wxROLE\_SYSTEM\_CLIENT,
103 wxROLE\_SYSTEM\_CLOCK,
104 wxROLE\_SYSTEM\_COLUMN,
105 wxROLE\_SYSTEM\_COLUMNHEADER,
106 wxROLE\_SYSTEM\_COMBOBOX,
107 wxROLE\_SYSTEM\_CURSOR,
108 wxROLE\_SYSTEM\_DIAGRAM,
109 wxROLE\_SYSTEM\_DIAL,
110 wxROLE\_SYSTEM\_DIALOG,
111 wxROLE\_SYSTEM\_DOCUMENT,
112 wxROLE\_SYSTEM\_DROPLIST,
113 wxROLE\_SYSTEM\_EQUATION,
114 wxROLE\_SYSTEM\_GRAPHIC,
115 wxROLE\_SYSTEM\_GRIP,
116 wxROLE\_SYSTEM\_GROUPING,
117 wxROLE\_SYSTEM\_HELPBALLOON,
118 wxROLE\_SYSTEM\_HOTKEYFIELD,
119 wxROLE\_SYSTEM\_INDICATOR,
120 wxROLE\_SYSTEM\_LINK,
121 wxROLE\_SYSTEM\_LIST,
122 wxROLE\_SYSTEM\_LISTITEM,
123 wxROLE\_SYSTEM\_MENUBAR,
124 wxROLE\_SYSTEM\_MENUITEM,
125 wxROLE\_SYSTEM\_MENUPOPUP,
126 wxROLE\_SYSTEM\_OUTLINE,
127 wxROLE\_SYSTEM\_OUTLINEITEM,
128 wxROLE\_SYSTEM\_PAGETAB,
129 wxROLE\_SYSTEM\_PAGETABLIST,
130 wxROLE\_SYSTEM\_PANE,
131 wxROLE\_SYSTEM\_PROGRESSBAR,
132 wxROLE\_SYSTEM\_PROPERTYPAGE,
133 wxROLE\_SYSTEM\_PUSHBUTTON,
134 wxROLE\_SYSTEM\_RADIOBUTTON,
135 wxROLE\_SYSTEM\_ROW,
136 wxROLE\_SYSTEM\_ROWHEADER,
137 wxROLE\_SYSTEM\_SCROLLBAR,
138 wxROLE\_SYSTEM\_SEPARATOR,
139 wxROLE\_SYSTEM\_SLIDER,
140 wxROLE\_SYSTEM\_SOUND,
141 wxROLE\_SYSTEM\_SPINBUTTON,
142 wxROLE\_SYSTEM\_STATICTEXT,
143 wxROLE\_SYSTEM\_STATUSBAR,
144 wxROLE\_SYSTEM\_TABLE,
145 wxROLE\_SYSTEM\_TEXT,
146 wxROLE\_SYSTEM\_TITLEBAR,
147 wxROLE\_SYSTEM\_TOOLBAR,
148 wxROLE\_SYSTEM\_TOOLTIP,
149 wxROLE\_SYSTEM\_WHITESPACE,
150 wxROLE\_SYSTEM\_WINDOW
151} wxAccRole
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152\end{verbatim}
153}
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154
155Objects are represented by the following type:
156
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157{\small
158\begin{verbatim}
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159typedef enum {
160 wxOBJID\_WINDOW = 0x00000000,
161 wxOBJID\_SYSMENU = 0xFFFFFFFF,
162 wxOBJID\_TITLEBAR = 0xFFFFFFFE,
163 wxOBJID\_MENU = 0xFFFFFFFD,
164 wxOBJID\_CLIENT = 0xFFFFFFFC,
165 wxOBJID\_VSCROLL = 0xFFFFFFFB,
166 wxOBJID\_HSCROLL = 0xFFFFFFFA,
167 wxOBJID\_SIZEGRIP = 0xFFFFFFF9,
168 wxOBJID\_CARET = 0xFFFFFFF8,
169 wxOBJID\_CURSOR = 0xFFFFFFF7,
170 wxOBJID\_ALERT = 0xFFFFFFF6,
171 wxOBJID\_SOUND = 0xFFFFFFF5
172} wxAccObject
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173\end{verbatim}
174}
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175
176Selection actions are identified by
177this type:
178
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179{\small
180\begin{verbatim}
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181typedef enum
182{
183 wxACC\_SEL\_NONE = 0,
184 wxACC\_SEL\_TAKEFOCUS = 1,
185 wxACC\_SEL\_TAKESELECTION = 2,
186 wxACC\_SEL\_EXTENDSELECTION = 4,
187 wxACC\_SEL\_ADDSELECTION = 8,
188 wxACC\_SEL\_REMOVESELECTION = 16
189} wxAccSelectionFlags
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190\end{verbatim}
191}
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192
193States are represented by the following:
194
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195{\small
196\begin{verbatim}
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197#define wxACC\_STATE\_SYSTEM\_ALERT\_HIGH 0x00000001
198#define wxACC\_STATE\_SYSTEM\_ALERT\_MEDIUM 0x00000002
199#define wxACC\_STATE\_SYSTEM\_ALERT\_LOW 0x00000004
200#define wxACC\_STATE\_SYSTEM\_ANIMATED 0x00000008
201#define wxACC\_STATE\_SYSTEM\_BUSY 0x00000010
202#define wxACC\_STATE\_SYSTEM\_CHECKED 0x00000020
203#define wxACC\_STATE\_SYSTEM\_COLLAPSED 0x00000040
204#define wxACC\_STATE\_SYSTEM\_DEFAULT 0x00000080
205#define wxACC\_STATE\_SYSTEM\_EXPANDED 0x00000100
206#define wxACC\_STATE\_SYSTEM\_EXTSELECTABLE 0x00000200
207#define wxACC\_STATE\_SYSTEM\_FLOATING 0x00000400
208#define wxACC\_STATE\_SYSTEM\_FOCUSABLE 0x00000800
209#define wxACC\_STATE\_SYSTEM\_FOCUSED 0x00001000
210#define wxACC\_STATE\_SYSTEM\_HOTTRACKED 0x00002000
211#define wxACC\_STATE\_SYSTEM\_INVISIBLE 0x00004000
212#define wxACC\_STATE\_SYSTEM\_MARQUEED 0x00008000
213#define wxACC\_STATE\_SYSTEM\_MIXED 0x00010000
214#define wxACC\_STATE\_SYSTEM\_MULTISELECTABLE 0x00020000
215#define wxACC\_STATE\_SYSTEM\_OFFSCREEN 0x00040000
216#define wxACC\_STATE\_SYSTEM\_PRESSED 0x00080000
217#define wxACC\_STATE\_SYSTEM\_PROTECTED 0x00100000
218#define wxACC\_STATE\_SYSTEM\_READONLY 0x00200000
219#define wxACC\_STATE\_SYSTEM\_SELECTABLE 0x00400000
220#define wxACC\_STATE\_SYSTEM\_SELECTED 0x00800000
221#define wxACC\_STATE\_SYSTEM\_SELFVOICING 0x01000000
222#define wxACC\_STATE\_SYSTEM\_UNAVAILABLE 0x02000000
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223\end{verbatim}
224}
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225
226Event identifiers that can be sent via \helpref{wxAccessible::NotifyEvent}{wxaccessiblenotifyevent} are
227as follows:
228
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229{\small
230\begin{verbatim}
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231#define wxACC\_EVENT\_SYSTEM\_SOUND 0x0001
232#define wxACC\_EVENT\_SYSTEM\_ALERT 0x0002
233#define wxACC\_EVENT\_SYSTEM\_FOREGROUND 0x0003
234#define wxACC\_EVENT\_SYSTEM\_MENUSTART 0x0004
235#define wxACC\_EVENT\_SYSTEM\_MENUEND 0x0005
236#define wxACC\_EVENT\_SYSTEM\_MENUPOPUPSTART 0x0006
237#define wxACC\_EVENT\_SYSTEM\_MENUPOPUPEND 0x0007
238#define wxACC\_EVENT\_SYSTEM\_CAPTURESTART 0x0008
239#define wxACC\_EVENT\_SYSTEM\_CAPTUREEND 0x0009
240#define wxACC\_EVENT\_SYSTEM\_MOVESIZESTART 0x000A
241#define wxACC\_EVENT\_SYSTEM\_MOVESIZEEND 0x000B
242#define wxACC\_EVENT\_SYSTEM\_CONTEXTHELPSTART 0x000C
243#define wxACC\_EVENT\_SYSTEM\_CONTEXTHELPEND 0x000D
244#define wxACC\_EVENT\_SYSTEM\_DRAGDROPSTART 0x000E
245#define wxACC\_EVENT\_SYSTEM\_DRAGDROPEND 0x000F
246#define wxACC\_EVENT\_SYSTEM\_DIALOGSTART 0x0010
247#define wxACC\_EVENT\_SYSTEM\_DIALOGEND 0x0011
248#define wxACC\_EVENT\_SYSTEM\_SCROLLINGSTART 0x0012
249#define wxACC\_EVENT\_SYSTEM\_SCROLLINGEND 0x0013
250#define wxACC\_EVENT\_SYSTEM\_SWITCHSTART 0x0014
251#define wxACC\_EVENT\_SYSTEM\_SWITCHEND 0x0015
252#define wxACC\_EVENT\_SYSTEM\_MINIMIZESTART 0x0016
253#define wxACC\_EVENT\_SYSTEM\_MINIMIZEEND 0x0017
254#define wxACC\_EVENT\_OBJECT\_CREATE 0x8000
255#define wxACC\_EVENT\_OBJECT\_DESTROY 0x8001
256#define wxACC\_EVENT\_OBJECT\_SHOW 0x8002
257#define wxACC\_EVENT\_OBJECT\_HIDE 0x8003
258#define wxACC\_EVENT\_OBJECT\_REORDER 0x8004
259#define wxACC\_EVENT\_OBJECT\_FOCUS 0x8005
260#define wxACC\_EVENT\_OBJECT\_SELECTION 0x8006
261#define wxACC\_EVENT\_OBJECT\_SELECTIONADD 0x8007
262#define wxACC\_EVENT\_OBJECT\_SELECTIONREMOVE 0x8008
263#define wxACC\_EVENT\_OBJECT\_SELECTIONWITHIN 0x8009
264#define wxACC\_EVENT\_OBJECT\_STATECHANGE 0x800A
265#define wxACC\_EVENT\_OBJECT\_LOCATIONCHANGE 0x800B
266#define wxACC\_EVENT\_OBJECT\_NAMECHANGE 0x800C
267#define wxACC\_EVENT\_OBJECT\_DESCRIPTIONCHANGE 0x800D
268#define wxACC\_EVENT\_OBJECT\_VALUECHANGE 0x800E
269#define wxACC\_EVENT\_OBJECT\_PARENTCHANGE 0x800F
270#define wxACC\_EVENT\_OBJECT\_HELPCHANGE 0x8010
271#define wxACC\_EVENT\_OBJECT\_DEFACTIONCHANGE 0x8011
272#define wxACC\_EVENT\_OBJECT\_ACCELERATORCHANGE 0x8012
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273\end{verbatim}
274}
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275
276\latexignore{\rtfignore{\wxheading{Members}}}
277
278\membersection{wxAccessible::wxAccessible}\label{wxaccessiblewxaccessible}
279
280\func{}{wxAccessible}{\param{wxWindow* }{win = NULL}}
281
282Constructor, taking an optional window. The object can be associated with
283a window later.
284
285\membersection{wxAccessible::\destruct{wxAccessible}}\label{wxaccessibledtor}
286
287\func{}{\destruct{wxAccessible}}{\void}
288
289Destructor.
290
291\membersection{wxAccessible::DoDefaultAction}\label{wxaccessibledodefaultaction}
292
293\func{virtual wxAccStatus}{DoDefaultAction}{\param{int }{childId}}
294
295Performs the default action for the object. {\it childId} is 0 (the action for this object)
296or greater than 0 (the action for a child). Return wxACC\_NOT\_SUPPORTED if there
297is no default action for this window (e.g. an edit control).
298
299\membersection{wxAccessible::GetChild}\label{wxaccessiblegetchild}
300
301\func{virtual wxAccStatus}{GetChild}{\param{int }{childId}, \param{wxAccessible** }{child}}
302
303Gets the specified child (starting from 1). If {\it child} is NULL and the return value is wxACC\_OK,
304this means that the child is a simple element and not an accessible object.
305
306\membersection{wxAccessible::GetChildCount}\label{wxaccessiblegetchildcount}
307
a37e4a07 308\func{virtual wxAccStatus}{GetChildCount}{\param{int* }{childCount}}
2dab56e9 309
a37e4a07 310Returns the number of children in {\it childCount}.
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311
312\membersection{wxAccessible::GetDefaultAction}\label{wxaccessiblegetdefaultaction}
313
314\func{virtual wxAccStatus}{GetDefaultAction}{\param{int }{childId}, \param{wxString* }{actionName}}
315
316Gets the default action for this object (0) or a child (greater than 0).
317Return wxACC\_OK even if there is no action. {\it actionName} is the action, or the empty
318string if there is no action. The retrieved string describes the action that is performed on an object,
319not what the object does as a result. For example, a toolbar button that prints
320a document has a default action of "Press" rather than "Prints the current document."
321
322\membersection{wxAccessible::GetDescription}\label{wxaccessiblegetdescription}
323
324\func{virtual wxAccStatus}{GetDescription}{\param{int }{childId}, \param{wxString* }{description}}
325
326Returns the description for this object or a child.
327
328\membersection{wxAccessible::GetFocus}\label{wxaccessiblegetfocus}
329
330\func{virtual wxAccStatus}{GetFocus}{\param{int* }{childId}, \param{wxAccessible** }{child}}
331
332Gets the window with the keyboard focus. If childId is 0 and child is NULL, no object in
333this subhierarchy has the focus. If this object has the focus, child should be 'this'.
334
335\membersection{wxAccessible::GetHelpText}\label{wxaccessiblegethelptext}
336
337\func{virtual wxAccStatus}{GetHelpText}{\param{int }{childId}, \param{wxString* }{helpText}}
338
339Returns help text for this object or a child, similar to tooltip text.
340
341\membersection{wxAccessible::GetKeyboardShortcut}\label{wxaccessiblegetkeyboardshortcut}
342
343\func{virtual wxAccStatus}{GetKeyboardShortcut}{\param{int }{childId}, \param{wxString* }{shortcut}}
344
345Returns the keyboard shortcut for this object or child.
346Return e.g. ALT+K.
347
348\membersection{wxAccessible::GetLocation}\label{wxaccessiblegetlocation}
349
350\func{virtual wxAccStatus}{GetLocation}{\param{wxRect\& }{rect}, \param{int }{elementId}}
351
352Returns the rectangle for this object (id is 0) or a child element (id is greater than 0).
a37e4a07 353{\it rect} is in screen coordinates.
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354
355\membersection{wxAccessible::GetName}\label{wxaccessiblegetname}
356
357\func{virtual wxAccStatus}{GetName}{\param{int }{childId}, \param{wxString* }{name}}
358
359Gets the name of the specified object.
360
361\membersection{wxAccessible::GetParent}\label{wxaccessiblegetparent}
362
363\func{virtual wxAccStatus}{GetParent}{\param{wxAccessible** }{parent}}
364
365Returns the parent of this object, or NULL.
366
367\membersection{wxAccessible::GetRole}\label{wxaccessiblegetrole}
368
369\func{virtual wxAccStatus}{GetRole}{\param{int }{childId}, \param{wxAccRole* }{role}}
370
371Returns a role constant describing this object. See \helpref{wxAccessible}{wxaccessible} for a list
372of these roles.
373
374\membersection{wxAccessible::GetSelections}\label{wxaccessiblegetselections}
375
376\func{virtual wxAccStatus}{GetSelections}{\param{wxVariant* }{selections}}
377
378Gets a variant representing the selected children
379of this object.
380
381Acceptable values are:
382
383\begin{itemize}
384\item a null variant (IsNull() returns TRUE)
385\item a list variant (GetType() == wxT("list"))
386\item an integer representing the selected child element,
387or 0 if this object is selected (GetType() == wxT("long"))
388\item a "void*" pointer to a wxAccessible child object
389\end{itemize}
390
391\membersection{wxAccessible::GetState}\label{wxaccessiblegetstate}
392
393\func{virtual wxAccStatus}{GetState}{\param{int }{childId}, \param{long* }{state}}
394
395Returns a state constant. See \helpref{wxAccessible}{wxaccessible} for a list
396of these states.
397
398\membersection{wxAccessible::GetValue}\label{wxaccessiblegetvalue}
399
400\func{virtual wxAccStatus}{GetValue}{\param{int }{childId}, \param{wxString* }{strValue}}
401
402Returns a localized string representing the value for the object
403or child.
404
405\membersection{wxAccessible::GetWindow}\label{wxaccessiblegetwindow}
406
407\func{wxWindow*}{GetWindow}{\void}
408
409Returns the window associated with this object.
410
411\membersection{wxAccessible::HitTest}\label{wxaccessiblehittest}
412
413\func{virtual wxAccStatus}{HitTest}{\param{const wxPoint\& }{pt}, \param{int* }{childId}, \param{wxAccessible** }{childObject}}
414
415Returns a status value and object id to indicate whether the given point was on this or
416a child object. Can return either a child object, or an integer
417representing the child element, starting from 1.
418
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419{\it pt} is in screen coordinates.
420
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421\membersection{wxAccessible::Navigate}\label{wxaccessiblenavigate}
422
423\func{virtual wxAccStatus}{Navigate}{\param{wxNavDir }{navDir}, \param{int }{fromId}, \param{int* }{toId}, \param{wxAccessible** }{toObject}}
424
425Navigates from {\it fromId} to {\it toId}/{\it toObject}.
426
e415391a 427\membersection{wxAccessible::NotifyEvent}\label{wxaccessiblenotifyevent}
2dab56e9 428
e415391a 429\func{virtual static void}{NotifyEvent}{\param{int}{ eventType}, \param{wxWindow* }{window}, \param{wxAccObjectt }{objectType}, \param{int }{objectType}}
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430
431Allows the application to send an event when something changes in an accessible object.
432
433\membersection{wxAccessible::Select}\label{wxaccessibleselect}
434
435\func{virtual wxAccStatus}{Select}{\param{int }{childId}, \param{wxAccSelectionFlags }{selectFlags}}
436
437Selects the object or child. See \helpref{wxAccessible}{wxaccessible} for a list
438of the selection actions.
439
440\membersection{wxAccessible::SetWindow}\label{wxaccessiblesetwindow}
441
442\func{void}{SetWindow}{\param{wxWindow* }{window}}
443
444Sets the window associated with this object.
445