include/wx/cshelp.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/cshelp.h
   3 // Purpose:     Context-sensitive help support classes
   4 // Author:      Julian Smart, Vadim Zeitlin
   5 // Modified by:
   6 // Created:     08/09/2000
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2000 Julian Smart, Vadim Zeitlin
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_CSHELPH__
  13 #define _WX_CSHELPH__
  14
  15 #ifdef __GNUG__
  16     #pragma interface "cshelp.h"
  17 #endif
  18
  19 #include "wx/defs.h"
  20
  21 #if wxUSE_HELP
  22
  23 #include "wx/help.h"
  24 #include "wx/bmpbuttn.h"
  25
  26 // ----------------------------------------------------------------------------
  27 // classes used to implement context help UI
  28 // ----------------------------------------------------------------------------
  29
  30 /*
  31  * wxContextHelp
  32  * Invokes context-sensitive help. When the user
  33  * clicks on a window, a wxEVT_HELP event will be sent to that
  34  * window for the application to display help for.
  35  */
  36
  37 class WXDLLEXPORT wxContextHelp : public wxObject
  38 {
  39 public:
  40     wxContextHelp(wxWindow* win = NULL, bool beginHelp = TRUE);
  41     virtual ~wxContextHelp();
  42
  43     bool BeginContextHelp(wxWindow* win);
  44     bool EndContextHelp();
  45
  46     bool EventLoop();
  47     bool DispatchEvent(wxWindow* win, const wxPoint& pt);
  48
  49     void SetStatus(bool status) { m_status = status; }
  50
  51 protected:
  52     bool    m_inHelp;
  53     bool    m_status; // TRUE if the user left-clicked
  54
  55 private:
  56     DECLARE_DYNAMIC_CLASS(wxContextHelp)
  57 };
  58
  59 /*
  60  * wxContextHelpButton
  61  * You can add this to your dialogs (especially on non-Windows platforms)
  62  * to put the application into context help mode.
  63  */
  64
  65 class WXDLLEXPORT wxContextHelpButton : public wxBitmapButton
  66 {
  67 public:
  68     wxContextHelpButton(wxWindow* parent,
  69                         wxWindowID id = wxID_CONTEXT_HELP,
  70                         const wxPoint& pos = wxDefaultPosition,
  71                         const wxSize& size = wxDefaultSize,
  72                         long style = wxBU_AUTODRAW);
  73
  74     void OnContextHelp(wxCommandEvent& event);
  75
  76 private:
  77     DECLARE_CLASS(wxContextHelpButton)
  78     DECLARE_EVENT_TABLE()
  79 };
  80
  81 // ----------------------------------------------------------------------------
  82 // classes used to implement context help support
  83 // ----------------------------------------------------------------------------
  84
  85 // wxHelpProvider is an abstract class used by the program implementing context help to
  86 // show the help text (or whatever: it may be HTML page or anything else) for
  87 // the given window.
  88 //
  89 // The current help provider must be explicitly set by the application using
  90 // wxHelpProvider::Set().
  91 class WXDLLEXPORT wxHelpProvider
  92 {
  93 public:
  94     // get/set the current (application-global) help provider (Set() returns
  95     // the previous one)
  96     static wxHelpProvider *Set(wxHelpProvider *helpProvider)
  97     {
  98         wxHelpProvider *helpProviderOld = ms_helpProvider;
  99         ms_helpProvider = helpProvider;
 100         return helpProviderOld;
 101     }
 102
 103     // unlike some other class, the help provider is not created on demand,
 104     // this must be explicitly done by the application
 105     static wxHelpProvider *Get() { return ms_helpProvider; }
 106
 107     // get the help string (whose interpretation is help provider dependent
 108     // except that empty string always means that no help is associated with
 109     // the window) for this window
 110     virtual wxString GetHelp(const wxWindowBase *window) = 0;
 111
 112     // do show help for the given window (uses GetHelp() internally if
 113     // applicable), return TRUE if it was done or FALSE if no help available
 114     // for this window
 115     virtual bool ShowHelp(wxWindowBase *window) = 0;
 116
 117     // associate the text with the given window or id: although all help
 118     // providers have these functions to allow making wxWindow::SetHelpText()
 119     // work, not all of them implement them
 120     virtual void AddHelp(wxWindowBase *window, const wxString& text);
 121
 122     // this version associates the given text with all window with this id
 123     // (may be used to set the same help string for all [Cancel] buttons in
 124     // the application, for example)
 125     virtual void AddHelp(wxWindowID id, const wxString& text);
 126
 127     // removes the association
 128     virtual void RemoveHelp(wxWindowBase* window);
 129
 130     // virtual dtor for any base class
 131     virtual ~wxHelpProvider();
 132
 133 private:
 134     static wxHelpProvider *ms_helpProvider;
 135 };
 136
 137 // wxSimpleHelpProvider is an implementation of wxHelpProvider which supports
 138 // only plain text help strings and shows the string associated with the
 139 // control (if any) in a tooltip
 140 class WXDLLEXPORT wxSimpleHelpProvider : public wxHelpProvider
 141 {
 142 public:
 143     // implement wxHelpProvider methods
 144     virtual wxString GetHelp(const wxWindowBase *window);
 145     virtual bool ShowHelp(wxWindowBase *window);
 146     virtual void AddHelp(wxWindowBase *window, const wxString& text);
 147     virtual void AddHelp(wxWindowID id, const wxString& text);
 148     virtual void RemoveHelp(wxWindowBase* window);
 149
 150 protected:
 151     // we use 2 hashes for storing the help strings associated with windows
 152     // and the ids
 153     wxStringHashTable m_hashWindows,
 154                      m_hashIds;
 155 };
 156
 157 // wxHelpControllerHelpProvider is an implementation of wxHelpProvider which supports
 158 // both context identifiers and plain text help strings. If the help text is an integer,
 159 // it is passed to wxHelpController::DisplayContextPopup. Otherwise, it shows the string
 160 // in a tooltip as per wxSimpleHelpProvider.
 161 class WXDLLEXPORT wxHelpControllerHelpProvider : public wxSimpleHelpProvider
 162 {
 163 public:
 164     // Note that it doesn't own the help controller. The help controller
 165     // should be deleted separately.
 166     wxHelpControllerHelpProvider(wxHelpControllerBase* hc = (wxHelpControllerBase*) NULL);
 167
 168     // implement wxHelpProvider methods
 169     virtual bool ShowHelp(wxWindowBase *window);
 170
 171     // Other accessors
 172     void SetHelpController(wxHelpControllerBase* hc) { m_helpController = hc; }
 173     wxHelpControllerBase* GetHelpController() const { return m_helpController; }
 174
 175 protected:
 176     wxHelpControllerBase*   m_helpController;
 177 };
 178
 179 // Convenience function for turning context id into wxString
 180 WXDLLEXPORT wxString wxContextId(int id);
 181
 182 #endif // wxUSE_HELP
 183
 184 #endif // _WX_CSHELPH__
 185