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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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     DECLARE_NO_COPY_CLASS(wxContextHelpEvtHandler)
  61 };
  62
  63 // ============================================================================
  64 // implementation
  65 // ============================================================================
  66
  67 // ----------------------------------------------------------------------------
  68 // wxContextHelp
  69 // ----------------------------------------------------------------------------
  70
  71 /*
  72  * Invokes context-sensitive help
  73  */
  74
  75
  76 IMPLEMENT_DYNAMIC_CLASS(wxContextHelp, wxObject)
  77
  78 wxContextHelp::wxContextHelp(wxWindow* win, bool beginHelp)
  79 {
  80     m_inHelp = false;
  81
  82     if (beginHelp)
  83         BeginContextHelp(win);
  84 }
  85
  86 wxContextHelp::~wxContextHelp()
  87 {
  88     if (m_inHelp)
  89         EndContextHelp();
  90 }
  91
  92 // Not currently needed, but on some systems capture may not work as
  93 // expected so we'll leave it here for now.
  94 #ifdef __WXMOTIF__
  95 static void wxPushOrPopEventHandlers(wxContextHelp* help, wxWindow* win, bool push)
  96 {
  97     if (push)
  98         win->PushEventHandler(new wxContextHelpEvtHandler(help));
  99     else
 100         win->PopEventHandler(true);
 101
 102     wxWindowList::compatibility_iterator node = win->GetChildren().GetFirst();
 103     while (node)
 104     {
 105         wxWindow* child = node->GetData();
 106         wxPushOrPopEventHandlers(help, child, push);
 107
 108         node = node->GetNext();
 109     }
 110 }
 111 #endif
 112
 113 // Begin 'context help mode'
 114 bool wxContextHelp::BeginContextHelp(wxWindow* win)
 115 {
 116     if (!win)
 117         win = wxTheApp->GetTopWindow();
 118     if (!win)
 119         return false;
 120
 121     wxCursor cursor(wxCURSOR_QUESTION_ARROW);
 122     wxCursor oldCursor = win->GetCursor();
 123     win->SetCursor(cursor);
 124
 125 #ifdef __WXMSW__
 126     //    wxSetCursor(cursor);
 127 #endif
 128
 129     m_status = false;
 130
 131 #ifdef __WXMOTIF__
 132     wxPushOrPopEventHandlers(this, win, true);
 133 #else
 134     win->PushEventHandler(new wxContextHelpEvtHandler(this));
 135 #endif
 136
 137     win->CaptureMouse();
 138
 139     EventLoop();
 140
 141     win->ReleaseMouse();
 142
 143 #ifdef __WXMOTIF__
 144     wxPushOrPopEventHandlers(this, win, false);
 145 #else
 146     win->PopEventHandler(true);
 147 #endif
 148
 149     win->SetCursor(oldCursor);
 150
 151     if (m_status)
 152     {
 153         wxPoint pt;
 154         wxWindow* winAtPtr = wxFindWindowAtPointer(pt);
 155
 156 #if 0
 157         if (winAtPtr)
 158         {
 159             printf("Picked %s (%d)\n", winAtPtr->GetName().c_str(),
 160                    winAtPtr->GetId());
 161         }
 162 #endif
 163
 164         if (winAtPtr)
 165             DispatchEvent(winAtPtr, pt);
 166     }
 167
 168     return true;
 169 }
 170
 171 bool wxContextHelp::EndContextHelp()
 172 {
 173     m_inHelp = false;
 174
 175     return true;
 176 }
 177
 178 bool wxContextHelp::EventLoop()
 179 {
 180     m_inHelp = true;
 181
 182     while ( m_inHelp )
 183     {
 184         if (wxTheApp->Pending())
 185         {
 186             wxTheApp->Dispatch();
 187         }
 188         else
 189         {
 190             wxTheApp->ProcessIdle();
 191         }
 192     }
 193
 194     return true;
 195 }
 196
 197 bool wxContextHelpEvtHandler::ProcessEvent(wxEvent& event)
 198 {
 199     if (event.GetEventType() == wxEVT_LEFT_DOWN)
 200     {
 201         m_contextHelp->SetStatus(true);
 202         m_contextHelp->EndContextHelp();
 203         return true;
 204     }
 205
 206     if ((event.GetEventType() == wxEVT_CHAR) ||
 207         (event.GetEventType() == wxEVT_KEY_DOWN) ||
 208         (event.GetEventType() == wxEVT_ACTIVATE) ||
 209         (event.GetEventType() == wxEVT_MOUSE_CAPTURE_CHANGED))
 210     {
 211         // May have already been set to true by a left-click
 212         //m_contextHelp->SetStatus(false);
 213         m_contextHelp->EndContextHelp();
 214         return true;
 215     }
 216
 217     if ((event.GetEventType() == wxEVT_PAINT) ||
 218         (event.GetEventType() == wxEVT_ERASE_BACKGROUND))
 219     {
 220         event.Skip();
 221         return false;
 222     }
 223
 224     return true;
 225 }
 226
 227 // Dispatch the help event to the relevant window
 228 bool wxContextHelp::DispatchEvent(wxWindow* win, const wxPoint& pt)
 229 {
 230     wxWindow* subjectOfHelp = win;
 231     bool eventProcessed = false;
 232     while (subjectOfHelp && !eventProcessed)
 233     {
 234         wxHelpEvent helpEvent(wxEVT_HELP, subjectOfHelp->GetId(), pt) ;
 235         helpEvent.SetEventObject(subjectOfHelp);
 236
 237         eventProcessed = win->GetEventHandler()->ProcessEvent(helpEvent);
 238
 239         // Go up the window hierarchy until the event is handled (or not).
 240         // I.e. keep submitting ancestor windows until one is recognised
 241         // by the app code that processes the ids and displays help.
 242         subjectOfHelp = subjectOfHelp->GetParent();
 243     }
 244     return eventProcessed;
 245 }
 246
 247 // ----------------------------------------------------------------------------
 248 // wxContextHelpButton
 249 // ----------------------------------------------------------------------------
 250
 251 /*
 252  * wxContextHelpButton
 253  * You can add this to your dialogs (especially on non-Windows platforms)
 254  * to put the application into context help mode.
 255  */
 256
 257 static const char * csquery_xpm[] = {
 258 "12 11 2 1",
 259 "  c None",
 260 ". c #000000",
 261 "            ",
 262 "    ....    ",
 263 "   ..  ..   ",
 264 "   ..  ..   ",
 265 "      ..    ",
 266 "     ..     ",
 267 "     ..     ",
 268 "            ",
 269 "     ..     ",
 270 "     ..     ",
 271 "            "};
 272
 273 IMPLEMENT_CLASS(wxContextHelpButton, wxBitmapButton)
 274
 275 BEGIN_EVENT_TABLE(wxContextHelpButton, wxBitmapButton)
 276     EVT_BUTTON(wxID_CONTEXT_HELP, wxContextHelpButton::OnContextHelp)
 277 END_EVENT_TABLE()
 278
 279 wxContextHelpButton::wxContextHelpButton(wxWindow* parent,
 280                                          wxWindowID id,
 281                                          const wxPoint& pos,
 282                                          const wxSize& size,
 283                                          long style)
 284 #if defined(__WXPM__)
 285                    : wxBitmapButton(parent, id, wxBitmap(wxCSQUERY_BITMAP
 286                                                          ,wxBITMAP_TYPE_RESOURCE
 287                                                         ),
 288                                     pos, size, style)
 289 #else
 290                    : wxBitmapButton(parent, id, wxBitmap(csquery_xpm),
 291                                     pos, size, style)
 292 #endif
 293 {
 294 }
 295
 296 void wxContextHelpButton::OnContextHelp(wxCommandEvent& WXUNUSED(event))
 297 {
 298     wxContextHelp contextHelp(GetParent());
 299 }
 300
 301 // ----------------------------------------------------------------------------
 302 // wxHelpProvider
 303 // ----------------------------------------------------------------------------
 304
 305 wxHelpProvider *wxHelpProvider::ms_helpProvider = (wxHelpProvider *)NULL;
 306
 307 // trivial implementation of some methods which we don't want to make pure
 308 // virtual for convenience
 309
 310 void wxHelpProvider::AddHelp(wxWindowBase * WXUNUSED(window),
 311                              const wxString& WXUNUSED(text))
 312 {
 313 }
 314
 315 void wxHelpProvider::AddHelp(wxWindowID WXUNUSED(id),
 316                              const wxString& WXUNUSED(text))
 317 {
 318 }
 319
 320 // removes the association
 321 void wxHelpProvider::RemoveHelp(wxWindowBase* WXUNUSED(window))
 322 {
 323 }
 324
 325 wxHelpProvider::~wxHelpProvider()
 326 {
 327 }
 328
 329 // ----------------------------------------------------------------------------
 330 // wxSimpleHelpProvider
 331 // ----------------------------------------------------------------------------
 332
 333 wxString wxSimpleHelpProvider::GetHelp(const wxWindowBase *window)
 334 {
 335     wxLongToStringHashMap::iterator it = m_hashWindows.find((long)window);
 336
 337     if ( it == m_hashWindows.end() )
 338     {
 339         it = m_hashIds.find(window->GetId());
 340         if ( it == m_hashIds.end() )
 341             return wxEmptyString;
 342     }
 343
 344     return it->second;
 345 }
 346
 347 void wxSimpleHelpProvider::AddHelp(wxWindowBase *window, const wxString& text)
 348 {
 349     m_hashWindows.erase((long)window);
 350     m_hashWindows[(long)window] = text;
 351 }
 352
 353 void wxSimpleHelpProvider::AddHelp(wxWindowID id, const wxString& text)
 354 {
 355     wxLongToStringHashMap::key_type key = (wxLongToStringHashMap::key_type)id;
 356     m_hashIds.erase(key);
 357     m_hashIds[key] = text;
 358 }
 359
 360 // removes the association
 361 void wxSimpleHelpProvider::RemoveHelp(wxWindowBase* window)
 362 {
 363     m_hashWindows.erase((long)window);
 364 }
 365
 366 bool wxSimpleHelpProvider::ShowHelp(wxWindowBase *window)
 367 {
 368 #if wxUSE_TIPWINDOW
 369     static wxTipWindow* s_tipWindow = NULL;
 370
 371     if (s_tipWindow)
 372     {
 373         // Prevent s_tipWindow being nulled in OnIdle,
 374         // thereby removing the chance for the window to be closed by ShowHelp
 375         s_tipWindow->SetTipWindowPtr(NULL);
 376         s_tipWindow->Close();
 377     }
 378     s_tipWindow = NULL;
 379
 380     wxString text = GetHelp(window);
 381     if ( !text.empty() )
 382     {
 383         s_tipWindow = new wxTipWindow((wxWindow *)window, text, 100, & s_tipWindow);
 384
 385         return true;
 386     }
 387 #endif // wxUSE_TIPWINDOW
 388
 389     return false;
 390 }
 391
 392 // ----------------------------------------------------------------------------
 393 // wxHelpControllerHelpProvider
 394 // ----------------------------------------------------------------------------
 395
 396 wxHelpControllerHelpProvider::wxHelpControllerHelpProvider(wxHelpControllerBase* hc)
 397 {
 398     m_helpController = hc;
 399 }
 400
 401 bool wxHelpControllerHelpProvider::ShowHelp(wxWindowBase *window)
 402 {
 403     wxString text = GetHelp(window);
 404     if ( !text.empty() )
 405     {
 406         if (m_helpController)
 407         {
 408             if (text.IsNumber())
 409                 return m_helpController->DisplayContextPopup(wxAtoi(text));
 410
 411             // If the help controller is capable of popping up the text...
 412             else if (m_helpController->DisplayTextPopup(text, wxGetMousePosition()))
 413             {
 414                 return true;
 415             }
 416             else
 417             // ...else use the default method.
 418                 return wxSimpleHelpProvider::ShowHelp(window);
 419         }
 420         else
 421             return wxSimpleHelpProvider::ShowHelp(window);
 422
 423     }
 424
 425     return false;
 426 }
 427
 428 // Convenience function for turning context id into wxString
 429 wxString wxContextId(int id)
 430 {
 431     return wxString::Format(_T("%d"), id);
 432 }
 433
 434 // ----------------------------------------------------------------------------
 435 // wxHelpProviderModule: module responsible for cleaning up help provider.
 436 // ----------------------------------------------------------------------------
 437
 438 class wxHelpProviderModule : public wxModule
 439 {
 440 public:
 441     bool OnInit();
 442     void OnExit();
 443
 444 private:
 445     DECLARE_DYNAMIC_CLASS(wxHelpProviderModule)
 446 };
 447
 448 IMPLEMENT_DYNAMIC_CLASS(wxHelpProviderModule, wxModule)
 449
 450 bool wxHelpProviderModule::OnInit()
 451 {
 452     // Probably we don't want to do anything by default,
 453     // since it could pull in extra code
 454     // wxHelpProvider::Set(new wxSimpleHelpProvider);
 455
 456     return true;
 457 }
 458
 459 void wxHelpProviderModule::OnExit()
 460 {
 461     if (wxHelpProvider::Get())
 462     {
 463         delete wxHelpProvider::Get();
 464         wxHelpProvider::Set(NULL);
 465     }
 466 }
 467
 468 #endif // wxUSE_HELP