src/msw/evtloop.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/evtloop.cpp
   3 // Purpose:     implements wxEventLoop for MSW
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     01.06.01
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // License:     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 #ifndef WX_PRECOMP
  28     #if wxUSE_GUI
  29         #include "wx/window.h"
  30     #endif
  31     #include "wx/app.h"
  32 #endif //WX_PRECOMP
  33
  34 #include "wx/evtloop.h"
  35 #include "wx/thread.h"
  36 #include "wx/except.h"
  37 #include "wx/ptr_scpd.h"
  38 #include "wx/msw/private.h"
  39
  40 #if wxUSE_GUI
  41     #include "wx/tooltip.h"
  42     #if wxUSE_THREADS
  43         // define the list of MSG strutures
  44         WX_DECLARE_LIST(MSG, wxMsgList);
  45
  46         #include "wx/listimpl.cpp"
  47
  48         WX_DEFINE_LIST(wxMsgList)
  49     #endif // wxUSE_THREADS
  50 #endif //wxUSE_GUI
  51
  52 #if wxUSE_BASE
  53
  54 // ============================================================================
  55 // wxMSWEventLoopBase implementation
  56 // ============================================================================
  57
  58 // ----------------------------------------------------------------------------
  59 // ctor/dtor
  60 // ----------------------------------------------------------------------------
  61
  62 wxMSWEventLoopBase::wxMSWEventLoopBase()
  63 {
  64     m_shouldExit = false;
  65     m_exitcode = 0;
  66 }
  67
  68 // ----------------------------------------------------------------------------
  69 // wxEventLoop message processing dispatching
  70 // ----------------------------------------------------------------------------
  71
  72 bool wxMSWEventLoopBase::Pending() const
  73 {
  74     MSG msg;
  75     return ::PeekMessage(&msg, 0, 0, 0, PM_NOREMOVE) != 0;
  76 }
  77
  78 bool wxMSWEventLoopBase::GetNextMessage(WXMSG* msg)
  79 {
  80     wxCHECK_MSG( IsRunning(), false, _T("can't get messages if not running") );
  81
  82     const BOOL rc = ::GetMessage(msg, NULL, 0, 0);
  83
  84     if ( rc == 0 )
  85     {
  86         // got WM_QUIT
  87         return false;
  88     }
  89
  90     if ( rc == -1 )
  91     {
  92         // should never happen, but let's test for it nevertheless
  93         wxLogLastError(wxT("GetMessage"));
  94
  95         // still break from the loop
  96         return false;
  97     }
  98
  99     return true;
 100 }
 101
 102 #endif // wxUSE_BASE
 103
 104 #if wxUSE_GUI
 105
 106 // ============================================================================
 107 // GUI wxEventLoop implementation
 108 // ============================================================================
 109
 110 wxWindowMSW *wxGUIEventLoop::ms_winCritical = NULL;
 111
 112 bool wxGUIEventLoop::IsChildOfCriticalWindow(wxWindowMSW *win)
 113 {
 114     while ( win )
 115     {
 116         if ( win == ms_winCritical )
 117             return true;
 118
 119         win = win->GetParent();
 120     }
 121
 122     return false;
 123 }
 124
 125 bool wxGUIEventLoop::PreProcessMessage(WXMSG *msg)
 126 {
 127     HWND hwnd = msg->hwnd;
 128     wxWindow *wndThis = wxGetWindowFromHWND((WXHWND)hwnd);
 129     wxWindow *wnd;
 130
 131     // this might happen if we're in a modeless dialog, or if a wx control has
 132     // children which themselves were not created by wx (i.e. wxActiveX control children)
 133     if ( !wndThis )
 134     {
 135         while ( hwnd && (::GetWindowLong(hwnd, GWL_STYLE) & WS_CHILD ))
 136         {
 137             hwnd = ::GetParent(hwnd);
 138
 139             // If the control has a wx parent, break and give the parent a chance
 140             // to process the window message
 141             wndThis = wxGetWindowFromHWND((WXHWND)hwnd);
 142             if (wndThis != NULL)
 143                 break;
 144         }
 145
 146         if ( !wndThis )
 147         {
 148             // this may happen if the event occurred in a standard modeless dialog (the
 149             // only example of which I know of is the find/replace dialog) - then call
 150             // IsDialogMessage() to make TAB navigation in it work
 151
 152             // NOTE: IsDialogMessage() just eats all the messages (i.e. returns true for
 153             // them) if we call it for the control itself
 154             return hwnd && ::IsDialogMessage(hwnd, msg) != 0;
 155         }
 156     }
 157
 158     if ( !AllowProcessing(wndThis) )
 159     {
 160         // not a child of critical window, so we eat the event but take care to
 161         // stop an endless stream of WM_PAINTs which would have resulted if we
 162         // didn't validate the invalidated part of the window
 163         if ( msg->message == WM_PAINT )
 164             ::ValidateRect(hwnd, NULL);
 165
 166         return true;
 167     }
 168
 169 #if wxUSE_TOOLTIPS
 170     // we must relay WM_MOUSEMOVE events to the tooltip ctrl if we want it to
 171     // popup the tooltip bubbles
 172     if ( msg->message == WM_MOUSEMOVE )
 173     {
 174         // we should do it if one of window children has an associated tooltip
 175         // (and not just if the window has a tooltip itself)
 176         if ( wndThis->HasToolTips() )
 177             wxToolTip::RelayEvent((WXMSG *)msg);
 178     }
 179 #endif // wxUSE_TOOLTIPS
 180
 181     // allow the window to prevent certain messages from being
 182     // translated/processed (this is currently used by wxTextCtrl to always
 183     // grab Ctrl-C/V/X, even if they are also accelerators in some parent)
 184     if ( !wndThis->MSWShouldPreProcessMessage((WXMSG *)msg) )
 185     {
 186         return false;
 187     }
 188
 189     // try translations first: the accelerators override everything
 190     for ( wnd = wndThis; wnd; wnd = wnd->GetParent() )
 191     {
 192         if ( wnd->MSWTranslateMessage((WXMSG *)msg))
 193             return true;
 194
 195         // stop at first top level window, i.e. don't try to process the key
 196         // strokes originating in a dialog using the accelerators of the parent
 197         // frame - this doesn't make much sense
 198         if ( wnd->IsTopLevel() )
 199             break;
 200     }
 201
 202     // now try the other hooks (kbd navigation is handled here)
 203     for ( wnd = wndThis; wnd; wnd = wnd->GetParent() )
 204     {
 205         if ( wnd->MSWProcessMessage((WXMSG *)msg) )
 206             return true;
 207
 208         // also stop at first top level window here, just as above because
 209         // if we don't do this, pressing ESC on a modal dialog shown as child
 210         // of a modal dialog with wxID_CANCEL will cause the parent dialog to
 211         // be closed, for example
 212         if ( wnd->IsTopLevel() )
 213             break;
 214     }
 215
 216     // no special preprocessing for this message, dispatch it normally
 217     return false;
 218 }
 219
 220 void wxGUIEventLoop::ProcessMessage(WXMSG *msg)
 221 {
 222     // give us the chance to preprocess the message first
 223     if ( !PreProcessMessage(msg) )
 224     {
 225         // if it wasn't done, dispatch it to the corresponding window
 226         ::TranslateMessage(msg);
 227         ::DispatchMessage(msg);
 228     }
 229 }
 230
 231 bool wxGUIEventLoop::Dispatch()
 232 {
 233     MSG msg;
 234     if ( !GetNextMessage(&msg) )
 235         return false;
 236
 237 #if wxUSE_THREADS
 238     wxASSERT_MSG( wxThread::IsMain(),
 239                   wxT("only the main thread can process Windows messages") );
 240
 241     static bool s_hadGuiLock = true;
 242     static wxMsgList s_aSavedMessages;
 243
 244     // if a secondary thread owning the mutex is doing GUI calls, save all
 245     // messages for later processing - we can't process them right now because
 246     // it will lead to recursive library calls (and we're not reentrant)
 247     if ( !wxGuiOwnedByMainThread() )
 248     {
 249         s_hadGuiLock = false;
 250
 251         // leave out WM_COMMAND messages: too dangerous, sometimes
 252         // the message will be processed twice
 253         if ( !wxIsWaitingForThread() || msg.message != WM_COMMAND )
 254         {
 255             MSG* pMsg = new MSG(msg);
 256             s_aSavedMessages.Append(pMsg);
 257         }
 258
 259         return true;
 260     }
 261     else
 262     {
 263         // have we just regained the GUI lock? if so, post all of the saved
 264         // messages
 265         //
 266         // FIXME of course, it's not _exactly_ the same as processing the
 267         //       messages normally - expect some things to break...
 268         if ( !s_hadGuiLock )
 269         {
 270             s_hadGuiLock = true;
 271
 272             wxMsgList::compatibility_iterator node = s_aSavedMessages.GetFirst();
 273             while (node)
 274             {
 275                 MSG* pMsg = node->GetData();
 276                 s_aSavedMessages.Erase(node);
 277
 278                 ProcessMessage(pMsg);
 279                 delete pMsg;
 280
 281                 node = s_aSavedMessages.GetFirst();
 282             }
 283         }
 284     }
 285 #endif // wxUSE_THREADS
 286
 287     ProcessMessage(&msg);
 288
 289     return true;
 290 }
 291
 292 void wxGUIEventLoop::OnNextIteration()
 293 {
 294 #if wxUSE_THREADS
 295     wxMutexGuiLeaveOrEnter();
 296 #endif // wxUSE_THREADS
 297 }
 298
 299 void wxGUIEventLoop::WakeUp()
 300 {
 301     ::PostMessage(NULL, WM_NULL, 0, 0);
 302 }
 303
 304 #else // !wxUSE_GUI
 305
 306 #if wxUSE_CONSOLE_EVENTLOOP
 307
 308 void wxConsoleEventLoop::OnNextIteration()
 309 {
 310     if ( wxTheApp )
 311         wxTheApp->ProcessPendingEvents();
 312 }
 313
 314 void wxConsoleEventLoop::WakeUp()
 315 {
 316 #if wxUSE_THREADS
 317     wxWakeUpMainThread();
 318 #endif
 319 }
 320
 321 bool wxConsoleEventLoop::Dispatch()
 322 {
 323     MSG msg;
 324     if ( !GetNextMessage(&msg) )
 325         return false;
 326
 327     if ( msg.message == WM_TIMER )
 328     {
 329         TIMERPROC proc = (TIMERPROC)msg.lParam;
 330         if ( proc )
 331             (*proc)(NULL, 0, msg.wParam, 0);
 332     }
 333     else
 334     {
 335         ::DispatchMessage(&msg);
 336     }
 337
 338     return !m_shouldExit;
 339 }
 340
 341 #endif // wxUSE_CONSOLE_EVENTLOOP
 342
 343 #endif //wxUSE_GUI