+ virtual void Exit(int rc = 0) = 0;
+
+ // 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() = 0;
+
+ // same as Dispatch() but doesn't wait for longer than the specified (in
+ // ms) timeout, return true if an event was processed, false if we should
+ // exit the loop or -1 if timeout expired
+ virtual int DispatchTimeout(unsigned long timeout) = 0;
+
+ // implement this to wake up the loop: usually done by posting a dummy event
+ // to it (can be called from non main thread)
+ 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
+ virtual void WakeUpIdle();
+
+ // this virtual function is called when the application
+ // becomes idle and normally just sends wxIdleEvent to all interested
+ // parties
+ //
+ // 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!
+ bool Yield(bool onlyIfNeeded = false);
+ virtual bool YieldFor(long eventsToProcess) = 0;
+
+ // 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
+ virtual bool IsEventAllowedInsideYield(wxEventCategory cat) const
+ { return (m_eventsToProcessInsideYield & cat) != 0; }
+
+ // no SafeYield hooks since it uses wxWindow which is not available when wxUSE_GUI=0
+
+
+ // active loop
+ // -----------
+
+ // return currently active (running) event loop, may be NULL
+ static wxEventLoopBase *GetActive() { return ms_activeLoop; }
+
+ // set currently active (running) event loop
+ static void SetActive(wxEventLoopBase* loop) { ms_activeLoop = loop; }
+
+
+protected:
+ // 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() { }
+
+ // the pointer to currently active loop
+ static wxEventLoopBase *ms_activeLoop;
+
+ // 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;
+
+#if wxUSE_THREADS
+ // this critical section protects both the lists above
+ wxCriticalSection m_handlersWithPendingEventsLocker;
+#endif
+
+ // Yield() helpers:
+ bool m_isInsideYield;
+ long m_eventsToProcessInsideYield;
+
+ wxDECLARE_NO_COPY_CLASS(wxEventLoopBase);
+};
+
+#if defined(__WXMSW__) || defined(__WXMAC__) || defined(__WXDFB__) || defined(__UNIX__)
+
+// this class can be used to implement a standard event loop logic using
+// Pending() and Dispatch()
+//
+// it also handles idle processing automatically
+class WXDLLIMPEXP_BASE 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
projects / wxWidgets.git / blobdiff