+///////////////////////////////////////////////////////////////////////////////
+// Name: src/common/evtloopcmn.cpp
+// Purpose: common wxEventLoop-related stuff
+// Author: Vadim Zeitlin
+// Modified by:
+// Created: 2006-01-12
+// RCS-ID: $Id$
+// Copyright: (c) 2006 Vadim Zeitlin <vadim@wxwindows.org>
+// Licence: wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// for compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+ #pragma hdrstop
+#endif
+
+#include "wx/evtloop.h"
+
+// ----------------------------------------------------------------------------
+// globals
+// ----------------------------------------------------------------------------
+
+wxEventLoop *wxEventLoopBase::ms_activeLoop = NULL;
+
+// ============================================================================
+// wxEventLoopManual implementation
+// ============================================================================
+
+wxEventLoopManual::wxEventLoopManual()
+{
+ m_exitcode = 0;
+ m_shouldExit = false;
+}
+
+int wxEventLoopManual::Run()
+{
+ // event loops are not recursive, you need to create another loop!
+ wxCHECK_MSG( !IsRunning(), -1, _T("can't reenter a message loop") );
+
+ // 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(wx_static_cast(wxEventLoop *, 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 ( ;; )
+ {
+ try
+ {
+#endif // wxUSE_EXCEPTIONS
+
+ // this is the event loop itself
+ for ( ;; )
+ {
+ // give them the possibility to do whatever they want
+ OnNextIteration();
+
+ // 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;
+ }
+ }
+
+#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
+
+ return m_exitcode;
+}
+
+void wxEventLoopManual::Exit(int rc)
+{
+ wxCHECK_RET( IsRunning(), _T("can't call Exit() if not running") );
+
+ m_exitcode = rc;
+ m_shouldExit = true;
+
+ 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, do *not* use here calls such as PostQuitMessage() (under
+ // MSW) which terminate the current event loop here because we're not sure
+ // that it is going to be processed by the correct event loop: it would be
+ // possible that another one is started and terminated by mistake if we do
+ // this
+ WakeUp();
+}
+
projects / wxWidgets.git / commitdiff
