X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/ac8d0c118b7403e2838e75124b442051299e6f6c..169adfa9c4b781f737920bc808da91cd926c3e36:/src/msw/evtloop.cpp diff --git a/src/msw/evtloop.cpp b/src/msw/evtloop.cpp index a36caa946d..54ac1c55cd 100644 --- a/src/msw/evtloop.cpp +++ b/src/msw/evtloop.cpp @@ -17,10 +17,6 @@ // headers // ---------------------------------------------------------------------------- -#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) - #pragma implementation "evtloop.h" -#endif - // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" @@ -34,56 +30,74 @@ #endif //WX_PRECOMP #include "wx/evtloop.h" + #include "wx/tooltip.h" +#include "wx/except.h" +#include "wx/ptr_scpd.h" #include "wx/msw/private.h" #if wxUSE_THREADS - // define the array of MSG strutures - WX_DECLARE_OBJARRAY(MSG, wxMsgArray); - // VS: this is a bit dirty - it duplicates same declaration in app.cpp - // (and there's no WX_DEFINE_OBJARRAY for that reason - it is already - // defined in app.cpp). -#endif + #include "wx/thread.h" + + // define the list of MSG strutures + WX_DECLARE_LIST(MSG, wxMsgList); + + #include "wx/listimpl.cpp" + + WX_DEFINE_LIST(wxMsgList) +#endif // wxUSE_THREADS // ---------------------------------------------------------------------------- -// wxEventLoopImpl +// helper class // ---------------------------------------------------------------------------- -class WXDLLEXPORT wxEventLoopImpl +// this object sets the wxEventLoop given to the ctor as the currently active +// one and unsets it in its dtor +class wxEventLoopActivator { public: - // ctor - wxEventLoopImpl() { SetExitCode(0); } - - // process a message - void ProcessMessage(MSG *msg); - - // generate an idle message, return TRUE if more idle time requested - bool SendIdleMessage(); + wxEventLoopActivator(wxEventLoop **pActive, + wxEventLoop *evtLoop) + { + m_pActive = pActive; + m_evtLoopOld = *pActive; + *pActive = evtLoop; + } - // set/get the exit code - void SetExitCode(int exitcode) { m_exitcode = exitcode; } - int GetExitCode() const { return m_exitcode; } + ~wxEventLoopActivator() + { + // restore the previously active event loop + *m_pActive = m_evtLoopOld; + } private: - // preprocess a message, return TRUE if processed (i.e. no further - // dispatching required) - bool PreProcessMessage(MSG *msg); - - // the exit code of the event loop - int m_exitcode; + wxEventLoop *m_evtLoopOld; + wxEventLoop **m_pActive; }; // ============================================================================ -// wxEventLoopImpl implementation +// wxEventLoop implementation // ============================================================================ +wxEventLoop *wxEventLoopBase::ms_activeLoop = NULL; +wxWindowMSW *wxEventLoop::ms_winCritical = NULL; + // ---------------------------------------------------------------------------- -// wxEventLoopImpl message processing +// ctor/dtor // ---------------------------------------------------------------------------- -void wxEventLoopImpl::ProcessMessage(MSG *msg) +wxEventLoop::wxEventLoop() +{ + m_shouldExit = false; + m_exitcode = 0; +} + +// ---------------------------------------------------------------------------- +// wxEventLoop message processing +// ---------------------------------------------------------------------------- + +void wxEventLoop::ProcessMessage(WXMSG *msg) { // give us the chance to preprocess the message first if ( !PreProcessMessage(msg) ) @@ -94,18 +108,32 @@ void wxEventLoopImpl::ProcessMessage(MSG *msg) } } -bool wxEventLoopImpl::PreProcessMessage(MSG *msg) +bool wxEventLoop::IsChildOfCriticalWindow(wxWindowMSW *win) +{ + while ( win ) + { + if ( win == ms_winCritical ) + return true; + + win = win->GetParent(); + } + + return false; +} + +bool wxEventLoop::PreProcessMessage(WXMSG *msg) { HWND hwnd = msg->hwnd; - wxWindow *wndThis = wxGetWindowFromHWND((WXHWND)hwnd); + wxWindow * const wndThis = wxGetWindowFromHWND((WXHWND)hwnd); + wxWindow *wnd; - // this may happen if the event occured in a standard modeless dialog (the + // this may happen if the event occurred in a standard modeless dialog (the // only example of which I know of is the find/replace dialog) - then call // IsDialogMessage() to make TAB navigation in it work if ( !wndThis ) { // we need to find the dialog containing this control as - // IsDialogMessage() just eats all the messages (i.e. returns TRUE for + // IsDialogMessage() just eats all the messages (i.e. returns true for // them) if we call it for the control itself while ( hwnd && ::GetWindowLong(hwnd, GWL_STYLE) & WS_CHILD ) { @@ -115,6 +143,17 @@ bool wxEventLoopImpl::PreProcessMessage(MSG *msg) return hwnd && ::IsDialogMessage(hwnd, msg) != 0; } + if ( !AllowProcessing(wndThis) ) + { + // not a child of critical window, so we eat the event but take care to + // stop an endless stream of WM_PAINTs which would have resulted if we + // didn't validate the invalidated part of the window + if ( msg->message == WM_PAINT ) + ::ValidateRect(hwnd, NULL); + + return true; + } + #if wxUSE_TOOLTIPS // we must relay WM_MOUSEMOVE events to the tooltip ctrl if we want it to // popup the tooltip bubbles @@ -133,16 +172,14 @@ bool wxEventLoopImpl::PreProcessMessage(MSG *msg) // grab Ctrl-C/V/X, even if they are also accelerators in some parent) if ( !wndThis->MSWShouldPreProcessMessage((WXMSG *)msg) ) { - return FALSE; + return false; } // try translations first: the accelerators override everything - wxWindow *wnd; - for ( wnd = wndThis; wnd; wnd = wnd->GetParent() ) { if ( wnd->MSWTranslateMessage((WXMSG *)msg)) - return TRUE; + return true; // stop at first top level window, i.e. don't try to process the key // strokes originating in a dialog using the accelerators of the parent @@ -151,46 +188,33 @@ bool wxEventLoopImpl::PreProcessMessage(MSG *msg) break; } - // now try the other hooks (kbd navigation is handled here): we start from - // wndThis->GetParent() because wndThis->MSWProcessMessage() was already - // called above - for ( wnd = wndThis->GetParent(); wnd; wnd = wnd->GetParent() ) + // now try the other hooks (kbd navigation is handled here) + for ( wnd = wndThis; wnd; wnd = wnd->GetParent() ) { - if ( wnd->MSWProcessMessage((WXMSG *)msg) ) - return TRUE; + if (wnd != wndThis) // Skip the first since wndThis->MSWProcessMessage() was called above + { + if ( wnd->MSWProcessMessage((WXMSG *)msg) ) + return true; + } + + // Stop at first top level window (as per comment above). + // If we don't do this, pressing ESC on a modal dialog shown as child of a modal + // dialog with wxID_CANCEL will cause the parent dialog to be closed, for example + if (wnd->IsTopLevel()) + break; } // no special preprocessing for this message, dispatch it normally - return FALSE; + return false; } -// ---------------------------------------------------------------------------- -// wxEventLoopImpl idle event processing -// ---------------------------------------------------------------------------- - -bool wxEventLoopImpl::SendIdleMessage() -{ - return wxTheApp->ProcessIdle(); -} - -// ============================================================================ -// wxEventLoop implementation -// ============================================================================ - -wxEventLoop *wxEventLoop::ms_activeLoop = NULL; - // ---------------------------------------------------------------------------- // wxEventLoop running and exiting // ---------------------------------------------------------------------------- -wxEventLoop::~wxEventLoop() -{ - wxASSERT_MSG( !m_impl, _T("should have been deleted in Run()") ); -} - bool wxEventLoop::IsRunning() const { - return m_impl != NULL; + return ms_activeLoop == this; } int wxEventLoop::Run() @@ -198,47 +222,102 @@ int wxEventLoop::Run() // event loops are not recursive, you need to create another loop! wxCHECK_MSG( !IsRunning(), -1, _T("can't reenter a message loop") ); - m_impl = new wxEventLoopImpl; - - wxEventLoop *oldLoop = ms_activeLoop; - ms_activeLoop = this; - + // ProcessIdle() and Dispatch() below may throw so the code here should + // be exception-safe, hence we must use local objects for all actions we + // should undo + wxEventLoopActivator activate(&ms_activeLoop, this); + + // we must ensure that OnExit() is called even if an exception is thrown + // from inside Dispatch() but we must call it from Exit() in normal + // situations because it is supposed to be called synchronously, + // wxModalEventLoop depends on this (so we can't just use ON_BLOCK_EXIT or + // something similar here) +#if wxUSE_EXCEPTIONS for ( ;; ) { -#if wxUSE_THREADS - wxMutexGuiLeaveOrEnter(); -#endif // wxUSE_THREADS + try + { +#endif // wxUSE_EXCEPTIONS - // generate and process idle events for as long as we don't have - // anything else to do - while ( !Pending() && m_impl->SendIdleMessage() ) - ; + // this is the event loop itself + for ( ;; ) + { + #if wxUSE_THREADS + wxMutexGuiLeaveOrEnter(); + #endif // wxUSE_THREADS + + // generate and process idle events for as long as we don't + // have anything else to do + while ( !Pending() && (wxTheApp && wxTheApp->ProcessIdle()) ) + ; + + // if the "should exit" flag is set, the loop should terminate + // but not before processing any remaining messages so while + // Pending() returns true, do process them + if ( m_shouldExit ) + { + while ( Pending() ) + Dispatch(); + + break; + } + + // a message came or no more idle processing to do, sit in + // Dispatch() waiting for the next message + if ( !Dispatch() ) + { + // we got WM_QUIT + break; + } + } - // a message came or no more idle processing to do, sit in Dispatch() - // waiting for the next message - if ( !Dispatch() ) - { - // we got WM_QUIT +#if wxUSE_EXCEPTIONS + // exit the outer loop as well break; } + catch ( ... ) + { + try + { + if ( !wxTheApp || !wxTheApp->OnExceptionInMainLoop() ) + { + OnExit(); + break; + } + //else: continue running the event loop + } + catch ( ... ) + { + // OnException() throwed, possibly rethrowing the same + // exception again: very good, but we still need OnExit() to + // be called + OnExit(); + throw; + } + } } +#endif // wxUSE_EXCEPTIONS - int exitcode = m_impl->GetExitCode(); - delete m_impl; - m_impl = NULL; - - ms_activeLoop = oldLoop; - - return exitcode; + return m_exitcode; } void wxEventLoop::Exit(int rc) { wxCHECK_RET( IsRunning(), _T("can't call Exit() if not running") ); - m_impl->SetExitCode(rc); + m_exitcode = rc; + m_shouldExit = true; - ::PostQuitMessage(rc); + OnExit(); + + // all we have to do to exit from the loop is to (maybe) wake it up so that + // it can notice that Exit() had been called + // + // in particular, we do *not* use PostQuitMessage() here because we're not + // sure that WM_QUIT is going to be processed by the correct event loop: it + // is possible that another one is started before this one has a chance to + // process WM_QUIT + ::PostMessage(NULL, WM_NULL, 0, 0); } // ---------------------------------------------------------------------------- @@ -253,7 +332,7 @@ bool wxEventLoop::Pending() const bool wxEventLoop::Dispatch() { - wxCHECK_MSG( IsRunning(), FALSE, _T("can't call Dispatch() if not running") ); + wxCHECK_MSG( IsRunning(), false, _T("can't call Dispatch() if not running") ); MSG msg; BOOL rc = ::GetMessage(&msg, (HWND) NULL, 0, 0); @@ -261,7 +340,7 @@ bool wxEventLoop::Dispatch() if ( rc == 0 ) { // got WM_QUIT - return FALSE; + return false; } if ( rc == -1 ) @@ -270,31 +349,32 @@ bool wxEventLoop::Dispatch() wxLogLastError(wxT("GetMessage")); // still break from the loop - return FALSE; + return false; } #if wxUSE_THREADS wxASSERT_MSG( wxThread::IsMain(), wxT("only the main thread can process Windows messages") ); - static bool s_hadGuiLock = TRUE; - static wxMsgArray s_aSavedMessages; + static bool s_hadGuiLock = true; + static wxMsgList s_aSavedMessages; // if a secondary thread owning the mutex is doing GUI calls, save all // messages for later processing - we can't process them right now because // it will lead to recursive library calls (and we're not reentrant) if ( !wxGuiOwnedByMainThread() ) { - s_hadGuiLock = FALSE; + s_hadGuiLock = false; // leave out WM_COMMAND messages: too dangerous, sometimes // the message will be processed twice if ( !wxIsWaitingForThread() || msg.message != WM_COMMAND ) { - s_aSavedMessages.Add(msg); + MSG* pMsg = new MSG(msg); + s_aSavedMessages.Append(pMsg); } - return TRUE; + return true; } else { @@ -305,22 +385,25 @@ bool wxEventLoop::Dispatch() // messages normally - expect some things to break... if ( !s_hadGuiLock ) { - s_hadGuiLock = TRUE; + s_hadGuiLock = true; - size_t count = s_aSavedMessages.Count(); - for ( size_t n = 0; n < count; n++ ) + wxMsgList::compatibility_iterator node = s_aSavedMessages.GetFirst(); + while (node) { - MSG& msg = s_aSavedMessages[n]; - m_impl->ProcessMessage(&msg); - } + MSG* pMsg = node->GetData(); + s_aSavedMessages.Erase(node); - s_aSavedMessages.Empty(); + ProcessMessage(pMsg); + delete pMsg; + + node = s_aSavedMessages.GetFirst(); + } } } #endif // wxUSE_THREADS - m_impl->ProcessMessage(&msg); + ProcessMessage(&msg); - return TRUE; + return true; }