src/common/cshelp.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/cshelp.cpp
   3 // Purpose:     Context sensitive help class implementation
   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 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 #ifdef __GNUG__
  17     #pragma implementation "cshelp.h"
  18 #endif
  19
  20 // ----------------------------------------------------------------------------
  21 // headers
  22 // ----------------------------------------------------------------------------
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_HELP
  32
  33 #ifndef WX_PRECOMP
  34 #endif
  35
  36 #include "wx/tipwin.h"
  37 #include "wx/app.h"
  38 #include "wx/module.h"
  39 #include "wx/cshelp.h"
  40
  41 // ----------------------------------------------------------------------------
  42 // wxContextHelpEvtHandler private class
  43 // ----------------------------------------------------------------------------
  44
  45 // This class exists in order to eat events until the left mouse button is
  46 // pressed
  47 class wxContextHelpEvtHandler: public wxEvtHandler
  48 {
  49 public:
  50     wxContextHelpEvtHandler(wxContextHelp* contextHelp)
  51     {
  52         m_contextHelp = contextHelp;
  53     }
  54
  55     virtual bool ProcessEvent(wxEvent& event);
  56
  57 //// Data
  58     wxContextHelp* m_contextHelp;
  59 };
  60
  61 // ============================================================================
  62 // implementation
  63 // ============================================================================
  64
  65 // ----------------------------------------------------------------------------
  66 // wxContextHelp
  67 // ----------------------------------------------------------------------------
  68
  69 /*
  70  * Invokes context-sensitive help
  71  */
  72
  73
  74 IMPLEMENT_DYNAMIC_CLASS(wxContextHelp, wxObject)
  75
  76 wxContextHelp::wxContextHelp(wxWindow* win, bool beginHelp)
  77 {
  78     m_inHelp = FALSE;
  79
  80     if (beginHelp)
  81         BeginContextHelp(win);
  82 }
  83
  84 wxContextHelp::~wxContextHelp()
  85 {
  86     if (m_inHelp)
  87         EndContextHelp();
  88 }
  89
  90 // Begin 'context help mode'
  91 bool wxContextHelp::BeginContextHelp(wxWindow* win)
  92 {
  93     if (!win)
  94         win = wxTheApp->GetTopWindow();
  95     if (!win)
  96         return FALSE;
  97
  98     wxCursor cursor(wxCURSOR_QUESTION_ARROW);
  99     wxCursor oldCursor = win->GetCursor();
 100     win->SetCursor(cursor);
 101
 102 #ifdef __WXMSW__
 103     //    wxSetCursor(cursor);
 104 #endif
 105
 106     win->PushEventHandler(new wxContextHelpEvtHandler(this));
 107
 108     win->CaptureMouse();
 109
 110     EventLoop();
 111
 112     win->ReleaseMouse();
 113
 114     win->PopEventHandler(TRUE);
 115
 116     win->SetCursor(oldCursor);
 117
 118     if (m_status)
 119     {
 120         wxPoint pt;
 121         wxWindow* winAtPtr = wxFindWindowAtPointer(pt);
 122         if (winAtPtr)
 123             DispatchEvent(winAtPtr, pt);
 124     }
 125
 126     return TRUE;
 127 }
 128
 129 bool wxContextHelp::EndContextHelp()
 130 {
 131     m_inHelp = FALSE;
 132
 133     return TRUE;
 134 }
 135
 136 bool wxContextHelp::EventLoop()
 137 {
 138     m_inHelp = TRUE;
 139     while ( m_inHelp )
 140     {
 141         if (wxTheApp->Pending())
 142         {
 143             wxTheApp->Dispatch();
 144         }
 145         else
 146         {
 147             wxTheApp->ProcessIdle();
 148         }
 149     }
 150     return TRUE;
 151 }
 152
 153 bool wxContextHelpEvtHandler::ProcessEvent(wxEvent& event)
 154 {
 155     switch (event.GetEventType())
 156     {
 157         case wxEVT_LEFT_DOWN:
 158         {
 159           //wxMouseEvent& mouseEvent = (wxMouseEvent&) event;
 160             m_contextHelp->SetStatus(TRUE);
 161             m_contextHelp->EndContextHelp();
 162             return TRUE;
 163             break;
 164         }
 165         case wxEVT_CHAR:
 166         case wxEVT_KEY_DOWN:
 167         case wxEVT_ACTIVATE:
 168         case wxEVT_MOUSE_CAPTURE_CHANGED:
 169         {
 170             m_contextHelp->SetStatus(FALSE);
 171             m_contextHelp->EndContextHelp();
 172             return TRUE;
 173             break;
 174         }
 175         case wxEVT_PAINT:
 176         case wxEVT_ERASE_BACKGROUND:
 177         {
 178             event.Skip();
 179             return FALSE;
 180             break;
 181         }
 182     }
 183
 184     return TRUE;
 185 }
 186
 187 // Dispatch the help event to the relevant window
 188 bool wxContextHelp::DispatchEvent(wxWindow* win, const wxPoint& pt)
 189 {
 190     wxWindow* subjectOfHelp = win;
 191     bool eventProcessed = FALSE;
 192     while (subjectOfHelp && !eventProcessed)
 193     {
 194         wxHelpEvent helpEvent(wxEVT_HELP, subjectOfHelp->GetId(), pt) ;
 195         helpEvent.SetEventObject(this);
 196         eventProcessed = win->GetEventHandler()->ProcessEvent(helpEvent);
 197
 198         // Go up the window hierarchy until the event is handled (or not).
 199         // I.e. keep submitting ancestor windows until one is recognised
 200         // by the app code that processes the ids and displays help.
 201         subjectOfHelp = subjectOfHelp->GetParent();
 202     }
 203     return eventProcessed;
 204 }
 205
 206 // ----------------------------------------------------------------------------
 207 // wxContextHelpButton
 208 // ----------------------------------------------------------------------------
 209
 210 /*
 211  * wxContextHelpButton
 212  * You can add this to your dialogs (especially on non-Windows platforms)
 213  * to put the application into context help mode.
 214  */
 215
 216 #if !defined(__WXMSW__)
 217 static char * csquery_xpm[] = {
 218 "12 11 2 1",
 219 "  c None",
 220 ". c #000000",
 221 "            ",
 222 "    ....    ",
 223 "   ..  ..   ",
 224 "   ..  ..   ",
 225 "      ..    ",
 226 "     ..     ",
 227 "     ..     ",
 228 "            ",
 229 "     ..     ",
 230 "     ..     ",
 231 "            "};
 232 #endif
 233
 234 IMPLEMENT_CLASS(wxContextHelpButton, wxBitmapButton)
 235
 236 BEGIN_EVENT_TABLE(wxContextHelpButton, wxBitmapButton)
 237     EVT_BUTTON(wxID_CONTEXT_HELP, wxContextHelpButton::OnContextHelp)
 238 END_EVENT_TABLE()
 239
 240 wxContextHelpButton::wxContextHelpButton(wxWindow* parent,
 241                                          wxWindowID id,
 242                                          const wxPoint& pos,
 243                                          const wxSize& size,
 244                                          long style)
 245                    : wxBitmapButton(parent, id, wxBITMAP(csquery),
 246                                     pos, size, style)
 247 {
 248 }
 249
 250 void wxContextHelpButton::OnContextHelp(wxCommandEvent& event)
 251 {
 252     wxContextHelp contextHelp(GetParent());
 253 }
 254
 255 // ----------------------------------------------------------------------------
 256 // wxHelpProvider
 257 // ----------------------------------------------------------------------------
 258
 259 wxHelpProvider *wxHelpProvider::ms_helpProvider = (wxHelpProvider *)NULL;
 260
 261 // trivial implementation of some methods which we don't want to make pure
 262 // virtual for convenience
 263
 264 void wxHelpProvider::AddHelp(wxWindowBase * WXUNUSED(window),
 265                              const wxString& WXUNUSED(text))
 266 {
 267 }
 268
 269 void wxHelpProvider::AddHelp(wxWindowID WXUNUSED(id),
 270                              const wxString& WXUNUSED(text))
 271 {
 272 }
 273
 274 wxHelpProvider::~wxHelpProvider()
 275 {
 276 }
 277
 278 // ----------------------------------------------------------------------------
 279 // wxSimpleHelpProvider
 280 // ----------------------------------------------------------------------------
 281
 282 wxString wxSimpleHelpProvider::GetHelp(const wxWindowBase *window)
 283 {
 284     bool wasFound;
 285     wxString text = m_hashWindows.Get((long)window, &wasFound);
 286     if ( !wasFound )
 287         text = m_hashIds.Get(window->GetId());
 288
 289     return text;
 290 }
 291
 292 void wxSimpleHelpProvider::AddHelp(wxWindowBase *window, const wxString& text)
 293 {
 294     m_hashWindows.Put((long)window, text);
 295 }
 296
 297 void wxSimpleHelpProvider::AddHelp(wxWindowID id, const wxString& text)
 298 {
 299     m_hashIds.Put(id, text);
 300 }
 301
 302 bool wxSimpleHelpProvider::ShowHelp(wxWindowBase *window)
 303 {
 304     wxString text = GetHelp(window);
 305     if ( !text.empty() )
 306     {
 307         new wxTipWindow((wxWindow *)window, text);
 308
 309         return TRUE;
 310     }
 311
 312     return FALSE;
 313 }
 314
 315 // ----------------------------------------------------------------------------
 316 // wxHelpProviderModule: module responsible for cleaning up help provider.
 317 // ----------------------------------------------------------------------------
 318
 319 class wxHelpProviderModule : public wxModule
 320 {
 321 public:
 322     bool OnInit();
 323     void OnExit();
 324
 325 private:
 326     DECLARE_DYNAMIC_CLASS(wxHelpProviderModule)
 327 };
 328
 329 IMPLEMENT_DYNAMIC_CLASS(wxHelpProviderModule, wxModule)
 330
 331 bool wxHelpProviderModule::OnInit()
 332 {
 333     // Probably we don't want to do anything by default,
 334     // since it could pull in extra code
 335     // wxHelpProvider::Set(new wxSimpleHelpProvider);
 336
 337     return TRUE;
 338 }
 339
 340 void wxHelpProviderModule::OnExit()
 341 {
 342     if (wxHelpProvider::Get())
 343     {
 344         delete wxHelpProvider::Get();
 345         wxHelpProvider::Set(NULL);
 346     }
 347 }
 348
 349 #endif // wxUSE_HELP