// Created: 01.06.01
// RCS-ID: $Id$
// Copyright: (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
-// License: wxWindows license
+// License: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
// ============================================================================
// headers
// ----------------------------------------------------------------------------
-#ifdef __GNUG__
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "evtloop.h"
#endif
#endif
#ifndef WX_PRECOMP
+ #include "wx/window.h"
+ #include "wx/app.h"
#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
+ #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;
+
// ----------------------------------------------------------------------------
-// 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) )
}
}
-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 )
}
#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()
// 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);
}
// ----------------------------------------------------------------------------
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);
if ( rc == 0 )
{
// got WM_QUIT
- return FALSE;
+ return false;
}
if ( rc == -1 )
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() ||
- s_currentMsg.message != WM_COMMAND )
+ if ( !wxIsWaitingForThread() || msg.message != WM_COMMAND )
{
- s_aSavedMessages.Add(s_currentMsg);
+ MSG* pMsg = new MSG(msg);
+ s_aSavedMessages.Append(pMsg);
}
- return TRUE;
+ return true;
}
else
{
// 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;
}
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