docs/latex/wx/helpprov.tex

   1 \section{\class{wxHelpProvider}}\label{wxhelpprovider}
   2
   3 wxHelpProvider is an abstract class used by a program implementing context-sensitive help to
   4 show the help text for the given window.
   5
   6 The current help provider must be explicitly set by the application using
   7 wxHelpProvider::Set().
   8
   9 \wxheading{Derived from}
  10
  11 No base class
  12
  13 \wxheading{Include files}
  14
  15 <wx/cshelp.h>
  16
  17 \wxheading{Library}
  18
  19 \helpref{wxCore}{librarieslist}
  20
  21 \wxheading{See also}
  22
  23 \helpref{wxContextHelp}{wxcontexthelp}, \helpref{wxContextHelpButton}{wxcontexthelpbutton},
  24 \helpref{wxSimpleHelpProvider}{wxsimplehelpprovider}, \helpref{wxHelpControllerHelpProvider}{wxhelpcontrollerhelpprovider},
  25 \helpref{wxWindow::SetHelpText}{wxwindowsethelptext}, \helpref{wxWindow::GetHelpTextAtPoint}{wxwindowgethelptextatpoint}
  26
  27 \latexignore{\rtfignore{\wxheading{Members}}}
  28
  29
  30 \membersection{wxHelpProvider::\destruct{wxHelpProvider}}\label{wxhelpproviderdtor}
  31
  32 \func{}{\destruct{wxHelpProvider}}{\void}
  33
  34 Virtual destructor for any base class.
  35
  36
  37 \membersection{wxHelpProvider::AddHelp}\label{wxhelpprovideraddhelp}
  38
  39 \func{void}{AddHelp}{\param{wxWindowBase* }{window}, \param{const wxString\& }{text}}
  40
  41 Associates the text with the given window or id. Although all help
  42 providers have these functions to allow making \helpref{wxWindow::SetHelpText}{wxwindowsethelptext}
  43 work, not all of them implement the functions.
  44
  45
  46 \membersection{wxHelpProvider::Get}\label{wxhelpproviderget}
  47
  48 \func{wxHelpProvider*}{Get}{\void}
  49
  50 Unlike some other classes, the help provider is not created on demand.
  51 This must be explicitly done by the application.
  52
  53
  54 \membersection{wxHelpProvider::GetHelp}\label{wxhelpprovidergethelp}
  55
  56 \func{wxString}{GetHelp}{\param{const wxWindowBase* }{window}}
  57
  58 Gets the help string for this window. Its interpretation is dependent on the help provider
  59 except that empty string always means that no help is associated with
  60 the window.
  61
  62 \func{void}{AddHelp}{\param{wxWindowID }{id}, \param{const wxString\& }{text}}
  63
  64 This version associates the given text with all windows with this id.
  65 May be used to set the same help string for all Cancel buttons in
  66 the application, for example.
  67
  68
  69 \membersection{wxHelpProvider::RemoveHelp}\label{wxhelpproviderremovehelp}
  70
  71 \func{void}{RemoveHelp}{\param{wxWindowBase* }{window}}
  72
  73 Removes the association between the window pointer and the help text. This is
  74 called by the wxWindow destructor. Without this, the table of help strings will fill up
  75 and when window pointers are reused, the wrong help string will be found.
  76
  77
  78 \membersection{wxHelpProvider::Set}\label{wxhelpproviderset}
  79
  80 \func{wxHelpProvider*}{Set}{\param{wxHelpProvider* }{helpProvider}}
  81
  82 Get/set the current, application-wide help provider. Returns
  83 the previous one.
  84
  85
  86 \membersection{wxHelpProvider::ShowHelpAtPoint}\label{wxhelpprovidershowhelpatpoint}
  87
  88 \func{bool}{ShowHelpAtPoint}{\param{wxWindowBase* }{window}, \param{const wxPoint & }{point}, \param{wxHelpEvent::Origin }{origin}}
  89
  90 This function may be overridden to show help for the window when it should
  91 depend on the position inside the window, By default this method forwards to
  92 \helpref{ShowHelp}{wxhelpprovidershowhelp}, so it is enough to only implement
  93 the latter if the help doesn't depend on the position.
  94
  95 Returns \true if help was shown, or \false if no help was available for this
  96 window.
  97
  98 \wxheading{Parameters}
  99
 100 \docparam{window}{Window to show help text for.}
 101
 102 \docparam{point}{Coordinates of the mouse at the moment of help event emission.}
 103
 104 \docparam{origin}{Help event origin, see \helpref{wxHelpEvent::GetOrigin}{wxhelpeventgetorigin}.}
 105
 106 \newsince{2.7.0}
 107
 108
 109 \membersection{wxHelpProvider::ShowHelp}\label{wxhelpprovidershowhelp}
 110
 111 \func{bool}{ShowHelp}{\param{wxWindowBase* }{window}}
 112
 113 Shows help for the given window. Override this function if the help doesn't
 114 depend on the exact position inside the window, otherwise you need to override
 115 \helpref{ShowHelpAtPoint}{wxhelpprovidershowhelpatpoint}.
 116
 117 Returns \true if help was shown, or \false if no help was available for this
 118 window.
 119