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