// Author: Vadim Zeitlin
// Modified by:
// Created: 01.06.01
-// RCS-ID: $Id$
// Copyright: (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
#ifndef _WX_EVTLOOP_H_
#define _WX_EVTLOOP_H_
+#include "wx/event.h"
#include "wx/utils.h"
+// TODO: implement wxEventLoopSource for MSW (it should wrap a HANDLE and be
+// monitored using MsgWaitForMultipleObjects())
+#if defined(__WXOSX__) || (defined(__UNIX__) && !defined(__WXMSW__))
+ #define wxUSE_EVENTLOOP_SOURCE 1
+#else
+ #define wxUSE_EVENTLOOP_SOURCE 0
+#endif
+
+#if wxUSE_EVENTLOOP_SOURCE
+ class wxEventLoopSource;
+ class wxEventLoopSourceHandler;
+#endif
/*
NOTE ABOUT wxEventLoopBase::YieldFor LOGIC
// using it
virtual bool IsOk() const { return true; }
+ // returns true if this is the main loop
+ bool IsMain() const;
+
+#if wxUSE_EVENTLOOP_SOURCE
+ // create a new event loop source wrapping the given file descriptor and
+ // monitor it for events occurring on this descriptor in all event loops
+ static wxEventLoopSource *
+ AddSourceForFD(int fd, wxEventLoopSourceHandler *handler, int flags);
+#endif // wxUSE_EVENTLOOP_SOURCE
// dispatch&processing
// -------------------
// start the event loop, return the exit code when it is finished
- virtual int Run() = 0;
+ //
+ // notice that wx ports should override DoRun(), this method is virtual
+ // only to allow overriding it in the user code for custom event loops
+ virtual int Run();
// is this event loop running now?
//
bool IsRunning() const;
// exit from the loop with the given exit code
- virtual void Exit(int rc = 0) = 0;
+ //
+ // this can be only used to exit the currently running loop, use
+ // ScheduleExit() if this might not be the case
+ virtual void Exit(int rc = 0);
+
+ // ask the event loop to exit with the given exit code, can be used even if
+ // this loop is not running right now but the loop must have been started,
+ // i.e. Run() should have been already called
+ virtual void ScheduleExit(int rc = 0) = 0;
// return true if any events are available
virtual bool Pending() const = 0;
virtual void WakeUp() = 0;
- // pending events
- // --------------
-
- // process all events in the wxHandlersWithPendingEvents list -- it is necessary
- // to call this function to process posted events. This happens during each
- // event loop iteration in GUI mode but if there is no main loop, it may be
- // also called directly.
- virtual void ProcessPendingEvents();
-
- // check if there are pending events on global pending event list
- bool HasPendingEvents() const;
-
- // temporary suspends processing of the pending events
- void SuspendProcessingOfPendingEvents();
-
- // resume processing of the pending events previously stopped because of a
- // call to SuspendProcessingOfPendingEvents()
- void ResumeProcessingOfPendingEvents();
-
- // called by ~wxEvtHandler to (eventually) remove the handler from the list of
- // the handlers with pending events
- void RemovePendingEventHandler(wxEvtHandler* toRemove);
-
- // adds an event handler to the list of the handlers with pending events
- void AppendPendingEventHandler(wxEvtHandler* toAppend);
-
- // moves the event handler from the list of the handlers with pending events
- //to the list of the handlers with _delayed_ pending events
- void DelayPendingEventHandler(wxEvtHandler* toDelay);
-
-
// idle handling
// -------------
- // make sure that idle events are sent again
+ // make sure that idle events are sent again
virtual void WakeUpIdle();
// this virtual function is called when the application
- // becomes idle and normally just sends wxIdleEvent to all interested
- // parties
+ // becomes idle and by default it forwards to wxApp::ProcessIdle() and
+ // while it can be overridden in a custom event loop, you must call the
+ // base class version to ensure that idle events are still generated
//
// it should return true if more idle events are needed, false if not
virtual bool ProcessIdle();
// Yield-related hooks
// -------------------
- // process all currently pending events right now
- //
- // it is an error to call Yield() recursively unless the value of
- // onlyIfNeeded is true
- //
- // WARNING: this function is dangerous as it can lead to unexpected
- // reentrancies (i.e. when called from an event handler it
- // may result in calling the same event handler again), use
- // with _extreme_ care or, better, don't use at all!
+ // process all currently pending events right now
+ //
+ // it is an error to call Yield() recursively unless the value of
+ // onlyIfNeeded is true
+ //
+ // WARNING: this function is dangerous as it can lead to unexpected
+ // reentrancies (i.e. when called from an event handler it
+ // may result in calling the same event handler again), use
+ // with _extreme_ care or, better, don't use at all!
bool Yield(bool onlyIfNeeded = false);
virtual bool YieldFor(long eventsToProcess) = 0;
- // returns true if the main thread is inside a Yield() call
+ // returns true if the main thread is inside a Yield() call
virtual bool IsYielding() const
{ return m_isInsideYield; }
- // returns true if events of the given event category should be immediately
- // processed inside a wxApp::Yield() call or rather should be queued for
- // later processing by the main event loop
+ // returns true if events of the given event category should be immediately
+ // processed inside a wxApp::Yield() call or rather should be queued for
+ // later processing by the main event loop
virtual bool IsEventAllowedInsideYield(wxEventCategory cat) const
{ return (m_eventsToProcessInsideYield & cat) != 0; }
static wxEventLoopBase *GetActive() { return ms_activeLoop; }
// set currently active (running) event loop
- static void SetActive(wxEventLoopBase* loop) { ms_activeLoop = loop; }
+ static void SetActive(wxEventLoopBase* loop);
protected:
+ // real implementation of Run()
+ virtual int DoRun() = 0;
+
// this function should be called before the event loop terminates, whether
// this happens normally (because of Exit() call) or abnormally (because of
// an exception thrown from inside the loop)
- virtual void OnExit() { }
+ virtual void OnExit();
- // the pointer to currently active loop
- static wxEventLoopBase *ms_activeLoop;
+ // Return true if we're currently inside our Run(), even if another nested
+ // event loop is currently running, unlike IsRunning() (which should have
+ // been really called IsActive() but it's too late to change this now).
+ bool IsInsideRun() const { return m_isInsideRun; }
- // the array of the handlers with pending events which needs to be processed
- // inside ProcessPendingEvents()
- wxEvtHandlerArray m_handlersWithPendingEvents;
- // helper array used by ProcessPendingEvents()
- wxEvtHandlerArray m_handlersWithPendingDelayedEvents;
+ // the pointer to currently active loop
+ static wxEventLoopBase *ms_activeLoop;
-#if wxUSE_THREADS
- // this critical section protects both the lists above
- wxCriticalSection m_handlersWithPendingEventsLocker;
-#endif
+ // should we exit the loop?
+ bool m_shouldExit;
- // Yield() helpers:
+ // YieldFor() helpers:
bool m_isInsideYield;
long m_eventsToProcessInsideYield;
+ // this flag is set on entry into Run() and reset before leaving it
+ bool m_isInsideRun;
+private:
+
wxDECLARE_NO_COPY_CLASS(wxEventLoopBase);
};
-#if defined(__WXMSW__) || defined(__WXMAC__) || defined(__WXDFB__) || defined(__UNIX__)
+#if defined(__WINDOWS__) || defined(__WXMAC__) || defined(__WXDFB__) || (defined(__UNIX__) && !defined(__WXOSX__))
// this class can be used to implement a standard event loop logic using
// Pending() and Dispatch()
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);
+ virtual void ScheduleExit(int rc = 0);
protected:
+ // enters a loop calling OnNextIteration(), Pending() and Dispatch() and
+ // terminating when Exit() is called
+ virtual int DoRun();
+
// 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;
+private:
+ // process all already pending events and dispatch a new one (blocking
+ // until it appears in the event queue if necessary)
+ //
+ // returns the return value of Dispatch()
+ bool ProcessEvents();
+
+ wxDECLARE_NO_COPY_CLASS(wxEventLoopManual);
};
#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__)
+// integration with MFC) but currently this is not done for all ports yet (e.g.
+// wxX11) so fall back to the old wxGUIEventLoop definition below for them
+
+#if defined(__DARWIN__)
+ // CoreFoundation-based event loop is currently in wxBase so include it in
+ // any case too (although maybe it actually shouldn't be there at all)
+ #include "wx/osx/core/evtloop.h"
+#endif
+
+// include the header defining wxConsoleEventLoop
+#if defined(__UNIX__) && !defined(__WXMSW__)
+ #include "wx/unix/evtloop.h"
+#elif defined(__WINDOWS__)
+ #include "wx/msw/evtloopconsole.h"
+#endif
+
+#if wxUSE_GUI
+
+// include the appropriate header defining wxGUIEventLoop
+
+#if defined(__WXMSW__)
#include "wx/msw/evtloop.h"
-#elif defined(__WXMAC__)
- #include "wx/osx/evtloop.h"
#elif defined(__WXCOCOA__)
#include "wx/cocoa/evtloop.h"
+#elif defined(__WXOSX__)
+ #include "wx/osx/evtloop.h"
#elif defined(__WXDFB__)
#include "wx/dfb/evtloop.h"
#elif defined(__WXGTK20__)
wxGUIEventLoop() { m_impl = NULL; }
virtual ~wxGUIEventLoop();
- virtual int Run();
- virtual void Exit(int rc = 0);
+ virtual void ScheduleExit(int rc = 0);
virtual bool Pending() const;
virtual bool Dispatch();
virtual int DispatchTimeout(unsigned long timeout)
virtual bool YieldFor(long eventsToProcess);
protected:
+ virtual int DoRun();
+
// the pointer to the port specific implementation class
wxEventLoopImpl *m_impl;
#endif // platforms
-// also include the header defining wxConsoleEventLoop for Unix systems
-#if defined(__UNIX__)
- #include "wx/unix/evtloop.h"
-#endif
+#endif // wxUSE_GUI
-// we use a class rather than a typedef because wxEventLoop is forward-declared
-// in many places
#if wxUSE_GUI
+ // we use a class rather than a typedef because wxEventLoop is
+ // forward-declared in many places
class wxEventLoop : public wxGUIEventLoop { };
-#else // !GUI
+#else // !wxUSE_GUI
// we can't define wxEventLoop differently in GUI and base libraries so use
// a #define to still allow writing wxEventLoop in the user code
- #if wxUSE_CONSOLE_EVENTLOOP && (defined(__WXMSW__) || defined(__UNIX__))
+ #if wxUSE_CONSOLE_EVENTLOOP && (defined(__WINDOWS__) || defined(__UNIX__))
#define wxEventLoop wxConsoleEventLoop
#else // we still must define it somehow for the code below...
#define wxEventLoop wxEventLoopBase
inline bool wxEventLoopBase::IsRunning() const { return GetActive() == this; }
-#if wxUSE_GUI
+#if wxUSE_GUI && !defined(__WXOSX__)
// ----------------------------------------------------------------------------
// wxModalEventLoop
// ----------------------------------------------------------------------------
projects / wxWidgets.git / blobdiff