// Created: 01.06.01
// RCS-ID: $Id$
// Copyright: (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
-// Licence: wxWidgets licence
+// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
#ifndef _WX_EVTLOOP_H_
#define _WX_EVTLOOP_H_
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
- #pragma interface "evtloop.h"
-#endif
-
#include "wx/utils.h"
-class WXDLLEXPORT wxEventLoopImpl;
+class WXDLLEXPORT wxEventLoop;
// ----------------------------------------------------------------------------
// wxEventLoop: a GUI event loop
// ----------------------------------------------------------------------------
-class WXDLLEXPORT wxEventLoop
+class WXDLLEXPORT wxEventLoopBase
{
public:
- // ctor
- wxEventLoop() { m_impl = NULL; }
+ // trivial, but needed (because of wxEventLoopBase) ctor
+ wxEventLoopBase() { }
// dtor
- virtual ~wxEventLoop();
+ virtual ~wxEventLoopBase() { }
// start the event loop, return the exit code when it is finished
- virtual int Run();
+ virtual int Run() = 0;
// exit from the loop with the given exit code
- virtual void Exit(int rc = 0);
+ virtual void Exit(int rc = 0) = 0;
- // return TRUE if any events are available
- virtual bool Pending() const;
+ // return true if any events are available
+ virtual bool Pending() const = 0;
- // dispatch a single event, return FALSE if we should exit from the loop
- virtual bool Dispatch();
-
- // is the event loop running now?
- virtual bool IsRunning() const;
+ // dispatch a single event, return false if we should exit from the loop
+ virtual bool Dispatch() = 0;
// return currently active (running) event loop, may be NULL
static wxEventLoop *GetActive() { return ms_activeLoop; }
// set currently active (running) event loop
static void SetActive(wxEventLoop* loop) { ms_activeLoop = loop; }
+ // is this event loop running now?
+ //
+ // notice that even if this event loop hasn't terminated yet but has just
+ // spawned a nested (e.g. modal) event loop, this would return false
+ bool IsRunning() const;
+
protected:
// this function should be called before the event loop terminates, whether
// this happens normally (because of Exit() call) or abnormally (because of
// the pointer to currently active loop
static wxEventLoop *ms_activeLoop;
+ DECLARE_NO_COPY_CLASS(wxEventLoopBase)
+};
+
+#if defined(__WXMSW__) || defined(__WXMAC__)
+
+// this class can be used to implement a standard event loop logic using
+// Pending() and Dispatch()
+//
+// it also handles idle processing automatically
+class WXDLLEXPORT wxEventLoopManual : public wxEventLoopBase
+{
+public:
+ wxEventLoopManual();
+
+ // enters a loop calling OnNextIteration(), Pending() and Dispatch() and
+ // terminating when Exit() is called
+ virtual int Run();
+
+ // sets the "should exit" flag and wakes up the loop so that it terminates
+ // soon
+ virtual void Exit(int rc = 0);
+
+protected:
+ // implement this to wake up the loop: usually done by posting a dummy event
+ // to it (called from Exit())
+ virtual void WakeUp() = 0;
+
+ // may be overridden to perform some action at the start of each new event
+ // loop iteration
+ virtual void OnNextIteration() { }
+
+
+ // the loop exit code
+ int m_exitcode;
+
+ // should we exit the loop?
+ bool m_shouldExit;
+};
+
+#endif // platforms using "manual" loop
+
+// we're moving away from old m_impl wxEventLoop model as otherwise the user
+// code doesn't have access to platform-specific wxEventLoop methods and this
+// can sometimes be very useful (e.g. under MSW this is necessary for
+// integration with MFC) but currently this is done for MSW only, other ports
+// should follow a.s.a.p.
+#if defined(__WXPALMOS__)
+ #include "wx/palmos/evtloop.h"
+#elif defined(__WXMSW__)
+ #include "wx/msw/evtloop.h"
+#elif defined(__WXMAC__)
+ #include "wx/mac/evtloop.h"
+#else // other platform
+
+class WXDLLEXPORT wxEventLoopImpl;
+
+class WXDLLEXPORT wxEventLoop : public wxEventLoopBase
+{
+public:
+ wxEventLoop() { m_impl = NULL; }
+ virtual ~wxEventLoop();
+
+ virtual int Run();
+ virtual void Exit(int rc = 0);
+ virtual bool Pending() const;
+ virtual bool Dispatch();
+
+protected:
// the pointer to the port specific implementation class
wxEventLoopImpl *m_impl;
DECLARE_NO_COPY_CLASS(wxEventLoop)
};
+#endif // platforms
+
+inline bool wxEventLoopBase::IsRunning() const { return GetActive() == this; }
+
// ----------------------------------------------------------------------------
// wxModalEventLoop
// ----------------------------------------------------------------------------
wxWindowDisabler *m_windowDisabler;
};
+// ----------------------------------------------------------------------------
+// wxEventLoopActivator: helper class for wxEventLoop implementations
+// ----------------------------------------------------------------------------
+
+// this object sets the wxEventLoop given to the ctor as the currently active
+// one and unsets it in its dtor, this is especially useful in presence of
+// exceptions but is more tidy even when we don't use them
+class wxEventLoopActivator
+{
+public:
+ wxEventLoopActivator(wxEventLoop *evtLoop)
+ {
+ m_evtLoopOld = wxEventLoop::GetActive();
+ wxEventLoop::SetActive(evtLoop);
+ }
+
+ ~wxEventLoopActivator()
+ {
+ // restore the previously active event loop
+ wxEventLoop::SetActive(m_evtLoopOld);
+ }
+
+private:
+ wxEventLoop *m_evtLoopOld;
+};
+
#endif // _WX_EVTLOOP_H_
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