1 /////////////////////////////////////////////////////////////////////////////
3 // Purpose: interface of wxHelpProvider
4 // Author: wxWidgets team
6 // Licence: wxWindows license
7 /////////////////////////////////////////////////////////////////////////////
13 wxHelpProvider is an abstract class used by a program implementing
14 context-sensitive help to show the help text for the given window.
16 The current help provider must be explicitly set by the application using
22 @see wxContextHelp, wxContextHelpButton, wxSimpleHelpProvider,
23 wxHelpControllerHelpProvider, wxWindow::SetHelpText(),
24 wxWindow::GetHelpTextAtPoint()
30 Virtual destructor for any base class.
32 virtual ~wxHelpProvider();
35 Associates the text with the given window.
38 Although all help providers have these functions to allow making
39 wxWindow::SetHelpText() work, not all of them implement the functions.
41 virtual void AddHelp(wxWindowBase
* window
, const wxString
& text
);
44 Associates the text with the given ID.
46 This help text will be shown for all windows with ID @a id, unless they
47 have more specific help text associated using the other AddHelp()
48 prototype. May be used to set the same help string for all Cancel
49 buttons in the application, for example.
52 Although all help providers have these functions to allow making
53 wxWindow::SetHelpText() work, not all of them implement the functions.
55 virtual void AddHelp(wxWindowID id
, const wxString
& text
);
58 Returns pointer to help provider instance.
60 Unlike some other classes, the help provider is not created on demand.
61 This must be explicitly done by the application using Set().
63 static wxHelpProvider
* Get();
66 This version associates the given text with all windows with this id.
67 May be used to set the same help string for all Cancel buttons in
68 the application, for example.
70 virtual wxString
GetHelp(const wxWindowBase
* window
);
73 Removes the association between the window pointer and the help text.
74 This is called by the wxWindow destructor. Without this, the table of
75 help strings will fill up and when window pointers are reused, the
76 wrong help string will be found.
78 virtual void RemoveHelp(wxWindowBase
* window
);
81 Set the current, application-wide help provider.
83 @return Pointer to previous help provider or @NULL if there wasn't any.
85 static wxHelpProvider
* Set(wxHelpProvider
* helpProvider
);
88 Shows help for the given window.
90 Override this function if the help doesn't depend on the exact position
91 inside the window, otherwise you need to override ShowHelpAtPoint().
92 Returns @true if help was shown, or @false if no help was available for
95 virtual bool ShowHelp(wxWindowBase
* window
);
98 This function may be overridden to show help for the window when it
99 should depend on the position inside the window, By default this method
100 forwards to ShowHelp(), so it is enough to only implement the latter if
101 the help doesn't depend on the position.
104 Window to show help text for.
106 Coordinates of the mouse at the moment of help event emission.
108 Help event origin, see wxHelpEvent::GetOrigin.
110 @return @true if help was shown, or @false if no help was available
115 virtual bool ShowHelpAtPoint(wxWindowBase
* window
, const wxPoint point
,
116 wxHelpEvent::Origin origin
);
122 @class wxHelpControllerHelpProvider
125 wxHelpControllerHelpProvider is an implementation of wxHelpProvider which
126 supports both context identifiers and plain text help strings. If the help
127 text is an integer, it is passed to wxHelpController::DisplayContextPopup().
128 Otherwise, it shows the string in a tooltip as per wxSimpleHelpProvider. If
129 you use this with a wxCHMHelpController instance on windows, it will use
130 the native style of tip window instead of wxTipWindow.
132 You can use the convenience function wxContextId() to convert an integer
133 context id to a string for passing to wxWindow::SetHelpText().
138 @see wxHelpProvider, wxSimpleHelpProvider, wxContextHelp,
139 wxWindow::SetHelpText(), wxWindow::GetHelpTextAtPoint()
141 class wxHelpControllerHelpProvider
: public wxSimpleHelpProvider
145 Note that the instance doesn't own the help controller. The help
146 controller should be deleted separately.
148 wxHelpControllerHelpProvider(wxHelpControllerBase
* hc
= NULL
);
151 Returns the help controller associated with this help provider.
153 wxHelpControllerBase
* GetHelpController() const;
156 Sets the help controller associated with this help provider.
158 void SetHelpController(wxHelpControllerBase
* hc
);
167 This class changes the cursor to a query and puts the application into a
168 'context-sensitive help mode'. When the user left-clicks on a window
169 within the specified window, a wxEVT_HELP event is sent to that control,
170 and the application may respond to it by popping up some help.
174 wxContextHelp contextHelp(myWindow);
177 There are a couple of ways to invoke this behaviour implicitly:
179 - Use the wxDIALOG_EX_CONTEXTHELP style for a dialog (Windows only). This
180 will put a question mark in the titlebar, and Windows will put the
181 application into context-sensitive help mode automatically, with further
184 - Create a wxContextHelpButton, whose predefined behaviour is
185 to create a context help object. Normally you will write your application
186 so that this button is only added to a dialog for non-Windows platforms
187 (use wxDIALOG_EX_CONTEXTHELP on Windows).
189 Note that on Mac OS X, the cursor does not change when in context-sensitive
195 @see wxHelpEvent, wxHelpController, wxContextHelpButton
197 class wxContextHelp
: public wxObject
201 Constructs a context help object, calling BeginContextHelp() if
202 @a doNow is @true (the default).
204 If @a window is @NULL, the top window is used.
206 wxContextHelp(wxWindow
* window
= NULL
, bool doNow
= true);
209 Destroys the context help object.
214 Puts the application into context-sensitive help mode. @a window is the
215 window which will be used to catch events; if @NULL, the top window
216 will be used. Returns @true if the application was successfully put
217 into context-sensitive help mode. This function only returns when the
218 event loop has finished.
220 bool BeginContextHelp(wxWindow
* window
= NULL
);
223 Ends context-sensitive help mode. Not normally called by the
226 bool EndContextHelp();
232 @class wxContextHelpButton
235 Instances of this class may be used to add a question mark button that when
236 pressed, puts the application into context-help mode. It does this by
237 creating a wxContextHelp object which itself generates a wxEVT_HELP event
238 when the user clicks on a window.
240 On Windows, you may add a question-mark icon to a dialog by use of the
241 wxDIALOG_EX_CONTEXTHELP extra style, but on other platforms you will have
242 to add a button explicitly, usually next to OK, Cancel or similar buttons.
247 @see wxBitmapButton, wxContextHelp
249 class wxContextHelpButton
: public wxBitmapButton
252 /// Default constructor.
253 wxContextHelpButton();
256 Constructor, creating and showing a context help button.
259 Parent window. Must not be @NULL.
261 Button identifier. Defaults to wxID_CONTEXT_HELP.
265 Button size. If wxDefaultSize is specified then the button is sized
266 appropriately for the question mark bitmap.
271 Normally you only need pass the parent window to the constructor, and
272 use the defaults for the remaining parameters.
274 wxContextHelpButton(wxWindow
* parent
,
275 wxWindowID id
= wxID_CONTEXT_HELP
,
276 const wxPoint
& pos
= wxDefaultPosition
,
277 const wxSize
& size
= wxDefaultSize
,
278 long style
= wxBU_AUTODRAW
);
283 @class wxSimpleHelpProvider
286 wxSimpleHelpProvider is an implementation of wxHelpProvider which supports
287 only plain text help strings, and shows the string associated with the
288 control (if any) in a tooltip.
293 @see wxHelpProvider, wxHelpControllerHelpProvider, wxContextHelp,
294 wxWindow::SetHelpText()(, wxWindow::GetHelpTextAtPoint()
296 class wxSimpleHelpProvider
: public wxHelpProvider