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 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_HELP
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/app.h"
  31 #endif
  32
  33 #include "wx/tipwin.h"
  34 #include "wx/module.h"
  35 #include "wx/cshelp.h"
  36
  37 #if wxUSE_MS_HTML_HELP
  38     #include "wx/msw/helpchm.h"     // for ShowContextHelpPopup
  39     #include "wx/utils.h"           // for wxGetMousePosition()
  40 #endif
  41
  42 // ----------------------------------------------------------------------------
  43 // wxContextHelpEvtHandler private class
  44 // ----------------------------------------------------------------------------
  45
  46 // This class exists in order to eat events until the left mouse button is
  47 // pressed
  48 class wxContextHelpEvtHandler: public wxEvtHandler
  49 {
  50 public:
  51     wxContextHelpEvtHandler(wxContextHelp* contextHelp)
  52     {
  53         m_contextHelp = contextHelp;
  54     }
  55
  56     virtual bool ProcessEvent(wxEvent& event);
  57
  58 //// Data
  59     wxContextHelp* m_contextHelp;
  60
  61     DECLARE_NO_COPY_CLASS(wxContextHelpEvtHandler)
  62 };
  63
  64 // ============================================================================
  65 // implementation
  66 // ============================================================================
  67
  68 // ----------------------------------------------------------------------------
  69 // wxContextHelp
  70 // ----------------------------------------------------------------------------
  71
  72 /*
  73  * Invokes context-sensitive help
  74  */
  75
  76
  77 IMPLEMENT_DYNAMIC_CLASS(wxContextHelp, wxObject)
  78
  79 wxContextHelp::wxContextHelp(wxWindow* win, bool beginHelp)
  80 {
  81     m_inHelp = false;
  82
  83     if (beginHelp)
  84         BeginContextHelp(win);
  85 }
  86
  87 wxContextHelp::~wxContextHelp()
  88 {
  89     if (m_inHelp)
  90         EndContextHelp();
  91 }
  92
  93 // Not currently needed, but on some systems capture may not work as
  94 // expected so we'll leave it here for now.
  95 #ifdef __WXMOTIF__
  96 static void wxPushOrPopEventHandlers(wxContextHelp* help, wxWindow* win, bool push)
  97 {
  98     if (push)
  99         win->PushEventHandler(new wxContextHelpEvtHandler(help));
 100     else
 101         win->PopEventHandler(true);
 102
 103     wxWindowList::compatibility_iterator node = win->GetChildren().GetFirst();
 104     while (node)
 105     {
 106         wxWindow* child = node->GetData();
 107         wxPushOrPopEventHandlers(help, child, push);
 108
 109         node = node->GetNext();
 110     }
 111 }
 112 #endif
 113
 114 // Begin 'context help mode'
 115 bool wxContextHelp::BeginContextHelp(wxWindow* win)
 116 {
 117     if (!win)
 118         win = wxTheApp->GetTopWindow();
 119     if (!win)
 120         return false;
 121
 122     wxCursor cursor(wxCURSOR_QUESTION_ARROW);
 123     wxCursor oldCursor = win->GetCursor();
 124     win->SetCursor(cursor);
 125
 126 #ifdef __WXMSW__
 127     //    wxSetCursor(cursor);
 128 #endif
 129
 130     m_status = false;
 131
 132 #ifdef __WXMOTIF__
 133     wxPushOrPopEventHandlers(this, win, true);
 134 #else
 135     win->PushEventHandler(new wxContextHelpEvtHandler(this));
 136 #endif
 137
 138     win->CaptureMouse();
 139
 140     EventLoop();
 141
 142     win->ReleaseMouse();
 143
 144 #ifdef __WXMOTIF__
 145     wxPushOrPopEventHandlers(this, win, false);
 146 #else
 147     win->PopEventHandler(true);
 148 #endif
 149
 150     win->SetCursor(oldCursor);
 151
 152     if (m_status)
 153     {
 154         wxPoint pt;
 155         wxWindow* winAtPtr = wxFindWindowAtPointer(pt);
 156
 157 #if 0
 158         if (winAtPtr)
 159         {
 160             printf("Picked %s (%d)\n", winAtPtr->GetName().c_str(),
 161                    winAtPtr->GetId());
 162         }
 163 #endif
 164
 165         if (winAtPtr)
 166             DispatchEvent(winAtPtr, pt);
 167     }
 168
 169     return true;
 170 }
 171
 172 bool wxContextHelp::EndContextHelp()
 173 {
 174     m_inHelp = false;
 175
 176     return true;
 177 }
 178
 179 bool wxContextHelp::EventLoop()
 180 {
 181     m_inHelp = true;
 182
 183     while ( m_inHelp )
 184     {
 185         if (wxTheApp->Pending())
 186         {
 187             wxTheApp->Dispatch();
 188         }
 189         else
 190         {
 191             wxTheApp->ProcessIdle();
 192         }
 193     }
 194
 195     return true;
 196 }
 197
 198 bool wxContextHelpEvtHandler::ProcessEvent(wxEvent& event)
 199 {
 200     if (event.GetEventType() == wxEVT_LEFT_DOWN)
 201     {
 202         m_contextHelp->SetStatus(true);
 203         m_contextHelp->EndContextHelp();
 204         return true;
 205     }
 206
 207     if ((event.GetEventType() == wxEVT_CHAR) ||
 208         (event.GetEventType() == wxEVT_KEY_DOWN) ||
 209         (event.GetEventType() == wxEVT_ACTIVATE) ||
 210         (event.GetEventType() == wxEVT_MOUSE_CAPTURE_CHANGED))
 211     {
 212         // May have already been set to true by a left-click
 213         //m_contextHelp->SetStatus(false);
 214         m_contextHelp->EndContextHelp();
 215         return true;
 216     }
 217
 218     if ((event.GetEventType() == wxEVT_PAINT) ||
 219         (event.GetEventType() == wxEVT_ERASE_BACKGROUND))
 220     {
 221         event.Skip();
 222         return false;
 223     }
 224
 225     return true;
 226 }
 227
 228 // Dispatch the help event to the relevant window
 229 bool wxContextHelp::DispatchEvent(wxWindow* win, const wxPoint& pt)
 230 {
 231     wxCHECK_MSG( win, false, _T("win parameter can't be NULL") );
 232
 233     wxHelpEvent helpEvent(wxEVT_HELP, win->GetId(), pt,
 234                           wxHelpEvent::Origin_HelpButton);
 235     helpEvent.SetEventObject(win);
 236
 237     return win->GetEventHandler()->ProcessEvent(helpEvent);
 238 }
 239
 240 // ----------------------------------------------------------------------------
 241 // wxContextHelpButton
 242 // ----------------------------------------------------------------------------
 243
 244 /*
 245  * wxContextHelpButton
 246  * You can add this to your dialogs (especially on non-Windows platforms)
 247  * to put the application into context help mode.
 248  */
 249
 250 #ifndef __WXPM__
 251
 252 static const char * csquery_xpm[] = {
 253 "12 11 2 1",
 254 "  c None",
 255 ". c #000000",
 256 "            ",
 257 "    ....    ",
 258 "   ..  ..   ",
 259 "   ..  ..   ",
 260 "      ..    ",
 261 "     ..     ",
 262 "     ..     ",
 263 "            ",
 264 "     ..     ",
 265 "     ..     ",
 266 "            "};
 267
 268 #endif
 269
 270 IMPLEMENT_CLASS(wxContextHelpButton, wxBitmapButton)
 271
 272 BEGIN_EVENT_TABLE(wxContextHelpButton, wxBitmapButton)
 273     EVT_BUTTON(wxID_CONTEXT_HELP, wxContextHelpButton::OnContextHelp)
 274 END_EVENT_TABLE()
 275
 276 wxContextHelpButton::wxContextHelpButton(wxWindow* parent,
 277                                          wxWindowID id,
 278                                          const wxPoint& pos,
 279                                          const wxSize& size,
 280                                          long style)
 281 #if defined(__WXPM__)
 282                    : wxBitmapButton(parent, id, wxBitmap(wxCSQUERY_BITMAP
 283                                                          ,wxBITMAP_TYPE_RESOURCE
 284                                                         ),
 285                                     pos, size, style)
 286 #else
 287                    : wxBitmapButton(parent, id, wxBitmap(csquery_xpm),
 288                                     pos, size, style)
 289 #endif
 290 {
 291 }
 292
 293 void wxContextHelpButton::OnContextHelp(wxCommandEvent& WXUNUSED(event))
 294 {
 295     wxContextHelp contextHelp(GetParent());
 296 }
 297
 298 // ----------------------------------------------------------------------------
 299 // wxHelpProvider
 300 // ----------------------------------------------------------------------------
 301
 302 wxHelpProvider *wxHelpProvider::ms_helpProvider = (wxHelpProvider *)NULL;
 303
 304 // trivial implementation of some methods which we don't want to make pure
 305 // virtual for convenience
 306
 307 void wxHelpProvider::AddHelp(wxWindowBase * WXUNUSED(window),
 308                              const wxString& WXUNUSED(text))
 309 {
 310 }
 311
 312 void wxHelpProvider::AddHelp(wxWindowID WXUNUSED(id),
 313                              const wxString& WXUNUSED(text))
 314 {
 315 }
 316
 317 // removes the association
 318 void wxHelpProvider::RemoveHelp(wxWindowBase* WXUNUSED(window))
 319 {
 320 }
 321
 322 wxHelpProvider::~wxHelpProvider()
 323 {
 324 }
 325
 326 wxString wxHelpProvider::GetHelpTextMaybeAtPoint(wxWindowBase *window)
 327 {
 328     if ( m_helptextAtPoint != wxDefaultPosition ||
 329             m_helptextOrigin != wxHelpEvent::Origin_Unknown )
 330     {
 331         wxCHECK_MSG( window, wxEmptyString, _T("window must not be NULL") );
 332
 333         wxPoint pt = m_helptextAtPoint;
 334         wxHelpEvent::Origin origin = m_helptextOrigin;
 335
 336         m_helptextAtPoint = wxDefaultPosition;
 337         m_helptextOrigin = wxHelpEvent::Origin_Unknown;
 338
 339         return window->GetHelpTextAtPoint(pt, origin);
 340     }
 341
 342     return GetHelp(window);
 343 }
 344
 345 // ----------------------------------------------------------------------------
 346 // wxSimpleHelpProvider
 347 // ----------------------------------------------------------------------------
 348
 349 #define WINHASH_KEY(w) wxPtrToUInt(w)
 350
 351 wxString wxSimpleHelpProvider::GetHelp(const wxWindowBase *window)
 352 {
 353     wxSimpleHelpProviderHashMap::iterator it = m_hashWindows.find(WINHASH_KEY(window));
 354
 355     if ( it == m_hashWindows.end() )
 356     {
 357         it = m_hashIds.find(window->GetId());
 358         if ( it == m_hashIds.end() )
 359             return wxEmptyString;
 360     }
 361
 362     return it->second;
 363 }
 364
 365 void wxSimpleHelpProvider::AddHelp(wxWindowBase *window, const wxString& text)
 366 {
 367     m_hashWindows.erase(WINHASH_KEY(window));
 368     m_hashWindows[WINHASH_KEY(window)] = text;
 369 }
 370
 371 void wxSimpleHelpProvider::AddHelp(wxWindowID id, const wxString& text)
 372 {
 373     wxSimpleHelpProviderHashMap::key_type key = (wxSimpleHelpProviderHashMap::key_type)id;
 374     m_hashIds.erase(key);
 375     m_hashIds[key] = text;
 376 }
 377
 378 // removes the association
 379 void wxSimpleHelpProvider::RemoveHelp(wxWindowBase* window)
 380 {
 381     m_hashWindows.erase(WINHASH_KEY(window));
 382 }
 383
 384 bool wxSimpleHelpProvider::ShowHelp(wxWindowBase *window)
 385 {
 386 #if wxUSE_MS_HTML_HELP || wxUSE_TIPWINDOW
 387     const wxString text = GetHelpTextMaybeAtPoint(window);
 388
 389     if ( !text.empty() )
 390     {
 391         // use the native help popup style if it's available
 392 #if wxUSE_MS_HTML_HELP
 393         if ( !wxCHMHelpController::ShowContextHelpPopup
 394                                    (
 395                                         text,
 396                                         wxGetMousePosition(),
 397                                         (wxWindow *)window
 398                                    ) )
 399 #endif // wxUSE_MS_HTML_HELP
 400         {
 401 #if wxUSE_TIPWINDOW
 402             static wxTipWindow* s_tipWindow = NULL;
 403
 404             if ( s_tipWindow )
 405             {
 406                 // Prevent s_tipWindow being nulled in OnIdle, thereby removing
 407                 // the chance for the window to be closed by ShowHelp
 408                 s_tipWindow->SetTipWindowPtr(NULL);
 409                 s_tipWindow->Close();
 410             }
 411
 412             s_tipWindow = new wxTipWindow((wxWindow *)window, text,
 413                                             100, &s_tipWindow);
 414 #else // !wxUSE_TIPWINDOW
 415             // we tried wxCHMHelpController but it failed and we don't have
 416             // wxTipWindow to fall back on, so
 417             return false;
 418 #endif // wxUSE_TIPWINDOW
 419         }
 420
 421         return true;
 422     }
 423 #else // !wxUSE_MS_HTML_HELP && !wxUSE_TIPWINDOW
 424     wxUnusedVar(window);
 425 #endif // wxUSE_MS_HTML_HELP || wxUSE_TIPWINDOW
 426
 427     return false;
 428 }
 429
 430 // ----------------------------------------------------------------------------
 431 // wxHelpControllerHelpProvider
 432 // ----------------------------------------------------------------------------
 433
 434 wxHelpControllerHelpProvider::wxHelpControllerHelpProvider(wxHelpControllerBase* hc)
 435 {
 436     m_helpController = hc;
 437 }
 438
 439 bool wxHelpControllerHelpProvider::ShowHelp(wxWindowBase *window)
 440 {
 441     const wxString text = GetHelpTextMaybeAtPoint(window);
 442
 443     if ( text.empty() )
 444         return false;
 445
 446     if ( m_helpController )
 447     {
 448         // if it's a numeric topic, show it
 449         long topic;
 450         if ( text.ToLong(&topic) )
 451             return m_helpController->DisplayContextPopup(topic);
 452
 453         // otherwise show the text directly
 454         if ( m_helpController->DisplayTextPopup(text, wxGetMousePosition()) )
 455             return true;
 456     }
 457
 458     // if there is no help controller or it's not capable of showing the help,
 459     // fallback to the default method
 460     return wxSimpleHelpProvider::ShowHelp(window);
 461 }
 462
 463 // Convenience function for turning context id into wxString
 464 wxString wxContextId(int id)
 465 {
 466     return wxString::Format(_T("%d"), id);
 467 }
 468
 469 // ----------------------------------------------------------------------------
 470 // wxHelpProviderModule: module responsible for cleaning up help provider.
 471 // ----------------------------------------------------------------------------
 472
 473 class wxHelpProviderModule : public wxModule
 474 {
 475 public:
 476     bool OnInit();
 477     void OnExit();
 478
 479 private:
 480     DECLARE_DYNAMIC_CLASS(wxHelpProviderModule)
 481 };
 482
 483 IMPLEMENT_DYNAMIC_CLASS(wxHelpProviderModule, wxModule)
 484
 485 bool wxHelpProviderModule::OnInit()
 486 {
 487     // Probably we don't want to do anything by default,
 488     // since it could pull in extra code
 489     // wxHelpProvider::Set(new wxSimpleHelpProvider);
 490
 491     return true;
 492 }
 493
 494 void wxHelpProviderModule::OnExit()
 495 {
 496     if (wxHelpProvider::Get())
 497     {
 498         delete wxHelpProvider::Get();
 499         wxHelpProvider::Set(NULL);
 500     }
 501 }
 502
 503 #endif // wxUSE_HELP