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     #include "wx/module.h"
  32 #endif
  33
  34 #include "wx/tipwin.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 __WXMAC__
 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 #ifdef __WXMAC__
 153     wxSetCursor(wxNullCursor);
 154 #endif
 155
 156     if (m_status)
 157     {
 158         wxPoint pt;
 159         wxWindow* winAtPtr = wxFindWindowAtPointer(pt);
 160
 161 #if 0
 162         if (winAtPtr)
 163         {
 164             printf("Picked %s (%d)\n", winAtPtr->GetName().c_str(),
 165                    winAtPtr->GetId());
 166         }
 167 #endif
 168
 169         if (winAtPtr)
 170             DispatchEvent(winAtPtr, pt);
 171     }
 172
 173     return true;
 174 }
 175
 176 bool wxContextHelp::EndContextHelp()
 177 {
 178     m_inHelp = false;
 179
 180     return true;
 181 }
 182
 183 bool wxContextHelp::EventLoop()
 184 {
 185     m_inHelp = true;
 186
 187     while ( m_inHelp )
 188     {
 189         if (wxTheApp->Pending())
 190         {
 191             wxTheApp->Dispatch();
 192         }
 193         else
 194         {
 195             wxTheApp->ProcessIdle();
 196         }
 197     }
 198
 199     return true;
 200 }
 201
 202 bool wxContextHelpEvtHandler::ProcessEvent(wxEvent& event)
 203 {
 204     if (event.GetEventType() == wxEVT_LEFT_DOWN)
 205     {
 206         m_contextHelp->SetStatus(true);
 207         m_contextHelp->EndContextHelp();
 208         return true;
 209     }
 210
 211     if ((event.GetEventType() == wxEVT_CHAR) ||
 212         (event.GetEventType() == wxEVT_KEY_DOWN) ||
 213         (event.GetEventType() == wxEVT_ACTIVATE) ||
 214         (event.GetEventType() == wxEVT_MOUSE_CAPTURE_CHANGED))
 215     {
 216         // May have already been set to true by a left-click
 217         //m_contextHelp->SetStatus(false);
 218         m_contextHelp->EndContextHelp();
 219         return true;
 220     }
 221
 222     if ((event.GetEventType() == wxEVT_PAINT) ||
 223         (event.GetEventType() == wxEVT_ERASE_BACKGROUND))
 224     {
 225         event.Skip();
 226         return false;
 227     }
 228
 229     return true;
 230 }
 231
 232 // Dispatch the help event to the relevant window
 233 bool wxContextHelp::DispatchEvent(wxWindow* win, const wxPoint& pt)
 234 {
 235     wxCHECK_MSG( win, false, _T("win parameter can't be NULL") );
 236
 237     wxHelpEvent helpEvent(wxEVT_HELP, win->GetId(), pt,
 238                           wxHelpEvent::Origin_HelpButton);
 239     helpEvent.SetEventObject(win);
 240
 241     return win->GetEventHandler()->ProcessEvent(helpEvent);
 242 }
 243
 244 // ----------------------------------------------------------------------------
 245 // wxContextHelpButton
 246 // ----------------------------------------------------------------------------
 247
 248 /*
 249  * wxContextHelpButton
 250  * You can add this to your dialogs (especially on non-Windows platforms)
 251  * to put the application into context help mode.
 252  */
 253
 254 #ifndef __WXPM__
 255
 256 static const char * csquery_xpm[] = {
 257 "12 11 2 1",
 258 "  c None",
 259 ". c #000000",
 260 "            ",
 261 "    ....    ",
 262 "   ..  ..   ",
 263 "   ..  ..   ",
 264 "      ..    ",
 265 "     ..     ",
 266 "     ..     ",
 267 "            ",
 268 "     ..     ",
 269 "     ..     ",
 270 "            "};
 271
 272 #endif
 273
 274 IMPLEMENT_CLASS(wxContextHelpButton, wxBitmapButton)
 275
 276 BEGIN_EVENT_TABLE(wxContextHelpButton, wxBitmapButton)
 277     EVT_BUTTON(wxID_CONTEXT_HELP, wxContextHelpButton::OnContextHelp)
 278 END_EVENT_TABLE()
 279
 280 wxContextHelpButton::wxContextHelpButton(wxWindow* parent,
 281                                          wxWindowID id,
 282                                          const wxPoint& pos,
 283                                          const wxSize& size,
 284                                          long style)
 285 #if defined(__WXPM__)
 286                    : wxBitmapButton(parent, id, wxBitmap(wxCSQUERY_BITMAP
 287                                                          ,wxBITMAP_TYPE_RESOURCE
 288                                                         ),
 289                                     pos, size, style)
 290 #else
 291                    : wxBitmapButton(parent, id, wxBitmap(csquery_xpm),
 292                                     pos, size, style)
 293 #endif
 294 {
 295 }
 296
 297 void wxContextHelpButton::OnContextHelp(wxCommandEvent& WXUNUSED(event))
 298 {
 299     wxContextHelp contextHelp(GetParent());
 300 }
 301
 302 // ----------------------------------------------------------------------------
 303 // wxHelpProvider
 304 // ----------------------------------------------------------------------------
 305
 306 wxHelpProvider *wxHelpProvider::ms_helpProvider = (wxHelpProvider *)NULL;
 307
 308 // trivial implementation of some methods which we don't want to make pure
 309 // virtual for convenience
 310
 311 void wxHelpProvider::AddHelp(wxWindowBase * WXUNUSED(window),
 312                              const wxString& WXUNUSED(text))
 313 {
 314 }
 315
 316 void wxHelpProvider::AddHelp(wxWindowID WXUNUSED(id),
 317                              const wxString& WXUNUSED(text))
 318 {
 319 }
 320
 321 // removes the association
 322 void wxHelpProvider::RemoveHelp(wxWindowBase* WXUNUSED(window))
 323 {
 324 }
 325
 326 wxHelpProvider::~wxHelpProvider()
 327 {
 328 }
 329
 330 wxString wxHelpProvider::GetHelpTextMaybeAtPoint(wxWindowBase *window)
 331 {
 332     if ( m_helptextAtPoint != wxDefaultPosition ||
 333             m_helptextOrigin != wxHelpEvent::Origin_Unknown )
 334     {
 335         wxCHECK_MSG( window, wxEmptyString, _T("window must not be NULL") );
 336
 337         wxPoint pt = m_helptextAtPoint;
 338         wxHelpEvent::Origin origin = m_helptextOrigin;
 339
 340         m_helptextAtPoint = wxDefaultPosition;
 341         m_helptextOrigin = wxHelpEvent::Origin_Unknown;
 342
 343         return window->GetHelpTextAtPoint(pt, origin);
 344     }
 345
 346     return GetHelp(window);
 347 }
 348
 349 // ----------------------------------------------------------------------------
 350 // wxSimpleHelpProvider
 351 // ----------------------------------------------------------------------------
 352
 353 #define WINHASH_KEY(w) wxPtrToUInt(w)
 354
 355 wxString wxSimpleHelpProvider::GetHelp(const wxWindowBase *window)
 356 {
 357     wxSimpleHelpProviderHashMap::iterator it = m_hashWindows.find(WINHASH_KEY(window));
 358
 359     if ( it == m_hashWindows.end() )
 360     {
 361         it = m_hashIds.find(window->GetId());
 362         if ( it == m_hashIds.end() )
 363             return wxEmptyString;
 364     }
 365
 366     return it->second;
 367 }
 368
 369 void wxSimpleHelpProvider::AddHelp(wxWindowBase *window, const wxString& text)
 370 {
 371     m_hashWindows.erase(WINHASH_KEY(window));
 372     m_hashWindows[WINHASH_KEY(window)] = text;
 373 }
 374
 375 void wxSimpleHelpProvider::AddHelp(wxWindowID id, const wxString& text)
 376 {
 377     wxSimpleHelpProviderHashMap::key_type key = (wxSimpleHelpProviderHashMap::key_type)id;
 378     m_hashIds.erase(key);
 379     m_hashIds[key] = text;
 380 }
 381
 382 // removes the association
 383 void wxSimpleHelpProvider::RemoveHelp(wxWindowBase* window)
 384 {
 385     m_hashWindows.erase(WINHASH_KEY(window));
 386 }
 387
 388 bool wxSimpleHelpProvider::ShowHelp(wxWindowBase *window)
 389 {
 390 #if wxUSE_MS_HTML_HELP || wxUSE_TIPWINDOW
 391     const wxString text = GetHelpTextMaybeAtPoint(window);
 392
 393     if ( !text.empty() )
 394     {
 395         // use the native help popup style if it's available
 396 #if wxUSE_MS_HTML_HELP
 397         if ( !wxCHMHelpController::ShowContextHelpPopup
 398                                    (
 399                                         text,
 400                                         wxGetMousePosition(),
 401                                         (wxWindow *)window
 402                                    ) )
 403 #endif // wxUSE_MS_HTML_HELP
 404         {
 405 #if wxUSE_TIPWINDOW
 406             static wxTipWindow* s_tipWindow = NULL;
 407
 408             if ( s_tipWindow )
 409             {
 410                 // Prevent s_tipWindow being nulled in OnIdle, thereby removing
 411                 // the chance for the window to be closed by ShowHelp
 412                 s_tipWindow->SetTipWindowPtr(NULL);
 413                 s_tipWindow->Close();
 414             }
 415
 416             s_tipWindow = new wxTipWindow((wxWindow *)window, text,
 417                                             100, &s_tipWindow);
 418 #else // !wxUSE_TIPWINDOW
 419             // we tried wxCHMHelpController but it failed and we don't have
 420             // wxTipWindow to fall back on, so
 421             return false;
 422 #endif // wxUSE_TIPWINDOW
 423         }
 424
 425         return true;
 426     }
 427 #else // !wxUSE_MS_HTML_HELP && !wxUSE_TIPWINDOW
 428     wxUnusedVar(window);
 429 #endif // wxUSE_MS_HTML_HELP || wxUSE_TIPWINDOW
 430
 431     return false;
 432 }
 433
 434 // ----------------------------------------------------------------------------
 435 // wxHelpControllerHelpProvider
 436 // ----------------------------------------------------------------------------
 437
 438 wxHelpControllerHelpProvider::wxHelpControllerHelpProvider(wxHelpControllerBase* hc)
 439 {
 440     m_helpController = hc;
 441 }
 442
 443 bool wxHelpControllerHelpProvider::ShowHelp(wxWindowBase *window)
 444 {
 445     const wxString text = GetHelpTextMaybeAtPoint(window);
 446
 447     if ( text.empty() )
 448         return false;
 449
 450     if ( m_helpController )
 451     {
 452         // if it's a numeric topic, show it
 453         long topic;
 454         if ( text.ToLong(&topic) )
 455             return m_helpController->DisplayContextPopup(topic);
 456
 457         // otherwise show the text directly
 458         if ( m_helpController->DisplayTextPopup(text, wxGetMousePosition()) )
 459             return true;
 460     }
 461
 462     // if there is no help controller or it's not capable of showing the help,
 463     // fallback to the default method
 464     return wxSimpleHelpProvider::ShowHelp(window);
 465 }
 466
 467 // Convenience function for turning context id into wxString
 468 wxString wxContextId(int id)
 469 {
 470     return wxString::Format(_T("%d"), id);
 471 }
 472
 473 // ----------------------------------------------------------------------------
 474 // wxHelpProviderModule: module responsible for cleaning up help provider.
 475 // ----------------------------------------------------------------------------
 476
 477 class wxHelpProviderModule : public wxModule
 478 {
 479 public:
 480     bool OnInit();
 481     void OnExit();
 482
 483 private:
 484     DECLARE_DYNAMIC_CLASS(wxHelpProviderModule)
 485 };
 486
 487 IMPLEMENT_DYNAMIC_CLASS(wxHelpProviderModule, wxModule)
 488
 489 bool wxHelpProviderModule::OnInit()
 490 {
 491     // Probably we don't want to do anything by default,
 492     // since it could pull in extra code
 493     // wxHelpProvider::Set(new wxSimpleHelpProvider);
 494
 495     return true;
 496 }
 497
 498 void wxHelpProviderModule::OnExit()
 499 {
 500     if (wxHelpProvider::Get())
 501     {
 502         delete wxHelpProvider::Get();
 503         wxHelpProvider::Set(NULL);
 504     }
 505 }
 506
 507 #endif // wxUSE_HELP