X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/0cd7d9b2355834dfabd0faeab0c5e812ebc3905a..6ed16512ddcd12ce46157ae32ecd96240ed3737e:/src/msw/evtloop.cpp diff --git a/src/msw/evtloop.cpp b/src/msw/evtloop.cpp index ed84e41c76..d01f77b1b6 100644 --- a/src/msw/evtloop.cpp +++ b/src/msw/evtloop.cpp @@ -6,7 +6,7 @@ // Created: 01.06.01 // RCS-ID: $Id$ // Copyright: (c) 2001 Vadim Zeitlin -// License: wxWindows license +// License: wxWindows licence /////////////////////////////////////////////////////////////////////////////// // ============================================================================ @@ -17,7 +17,7 @@ // headers // ---------------------------------------------------------------------------- -#ifdef __GNUG__ +#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) #pragma implementation "evtloop.h" #endif @@ -29,61 +29,78 @@ #endif #ifndef WX_PRECOMP + #include "wx/window.h" + #include "wx/app.h" #endif //WX_PRECOMP #include "wx/evtloop.h" -#include "wx/window.h" -#include "wx/app.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; + +// ---------------------------------------------------------------------------- +// ctor/dtor +// ---------------------------------------------------------------------------- + +wxEventLoop::wxEventLoop() +{ + m_shouldExit = false; + m_exitcode = 0; +} + // ---------------------------------------------------------------------------- -// wxEventLoopImpl message processing +// wxEventLoop message processing // ---------------------------------------------------------------------------- -void wxEventLoopImpl::ProcessMessage(MSG *msg) +void wxEventLoop::ProcessMessage(WXMSG *msg) { // give us the chance to preprocess the message first if ( !PreProcessMessage(msg) ) @@ -94,15 +111,31 @@ void wxEventLoopImpl::ProcessMessage(MSG *msg) } } -bool wxEventLoopImpl::PreProcessMessage(MSG *msg) +bool wxEventLoop::PreProcessMessage(WXMSG *msg) { - HWND hWnd = msg->hwnd; - wxWindow *wndThis = wxGetWindowFromHWND((WXHWND)hWnd); + HWND hwnd = msg->hwnd; + wxWindow *wndThis = wxGetWindowFromHWND((WXHWND)hwnd); + + // this may happen if the event occured 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 + // them) if we call it for the control itself + while ( hwnd && ::GetWindowLong(hwnd, GWL_STYLE) & WS_CHILD ) + { + hwnd = ::GetParent(hwnd); + } + + return hwnd && ::IsDialogMessage(hwnd, msg) != 0; + } #if wxUSE_TOOLTIPS // we must relay WM_MOUSEMOVE events to the tooltip ctrl if we want it to // popup the tooltip bubbles - if ( wndThis && (msg->message == WM_MOUSEMOVE) ) + if ( msg->message == WM_MOUSEMOVE ) { wxToolTip *tt = wndThis->GetToolTip(); if ( tt ) @@ -112,52 +145,56 @@ bool wxEventLoopImpl::PreProcessMessage(MSG *msg) } #endif // wxUSE_TOOLTIPS - // try translations first; find the youngest window with a translation - // table. + // allow the window to prevent certain messages from being + // translated/processed (this is currently used by wxTextCtrl to always + // grab Ctrl-C/V/X, even if they are also accelerators in some parent) + if ( !wndThis->MSWShouldPreProcessMessage((WXMSG *)msg) ) + { + 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; + if ( wnd->MSWTranslateMessage((WXMSG *)msg)) + 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 + // frame - this doesn't make much sense + if ( wnd->IsTopLevel() ) + break; } - // Anyone for a non-translation message? Try youngest descendants first. + // 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; } - return FALSE; + // no special preprocessing for this message, dispatch it normally + return false; } -// ---------------------------------------------------------------------------- -// wxEventLoopImpl idle event processing -// ---------------------------------------------------------------------------- - -bool wxEventLoopImpl::SendIdleMessage() -{ - wxIdleEvent event; - - return wxTheApp->ProcessEvent(event) && event.MoreRequested(); -} - -// ============================================================================ -// wxEventLoop implementation -// ============================================================================ - // ---------------------------------------------------------------------------- // 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() @@ -165,42 +202,102 @@ 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; - + // 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; - - 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); } // ---------------------------------------------------------------------------- @@ -215,7 +312,7 @@ 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); @@ -223,7 +320,7 @@ bool wxEventLoop::Dispatch() if ( rc == 0 ) { // got WM_QUIT - return FALSE; + return false; } if ( rc == -1 ) @@ -232,32 +329,32 @@ 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 ) + if ( !wxIsWaitingForThread() || msg.message != WM_COMMAND ) { - s_aSavedMessages.Add(msg); + MSG* pMsg = new MSG(msg); + s_aSavedMessages.Append(pMsg); } - return TRUE; + return true; } else { @@ -268,22 +365,25 @@ 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; }