X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/d181e877b04950068cb809b0d3d1a911bea3de74..5a0a15cf56c4bfde818e9d575fb662612e156c2f:/include/wx/app.h?ds=sidebyside diff --git a/include/wx/app.h b/include/wx/app.h index c3b87dd018..5e0e97060e 100644 --- a/include/wx/app.h +++ b/include/wx/app.h @@ -32,6 +32,7 @@ class WXDLLIMPEXP_FWD_BASE wxMessageOutput; #if wxUSE_GUI struct WXDLLIMPEXP_FWD_CORE wxVideoMode; + class WXDLLIMPEXP_FWD_CORE wxWindow; #endif // ---------------------------------------------------------------------------- @@ -82,17 +83,25 @@ public: // class OnInit() to do it. virtual bool OnInit(); - // this is here only temporary hopefully (FIXME) - virtual bool OnInitGui() { return true; } - // This is the replacement for the normal main(): all program work should // be done here. When OnRun() returns, the programs starts shutting down. virtual int OnRun(); + // This is called by wxEventLoopBase::SetActive(): you should put the code + // which needs an active event loop here. + // Note that this function is called whenever an event loop is activated; + // you may want to use wxEventLoopBase::IsMain() to perform initialization + // specific for the app's main event loop. + virtual void OnEventLoopEnter(wxEventLoopBase* WXUNUSED(loop)) {} + // This is only called if OnInit() returned true so it's a good place to do // any cleanup matching the initializations done there. virtual int OnExit(); + // This is called by wxEventLoopBase::OnExit() for each event loop which + // is exited. + virtual void OnEventLoopExit(wxEventLoopBase* WXUNUSED(loop)) {} + // This is the very last function called on wxApp object before it is // destroyed. If you override it (instead of overriding OnExit() as usual) // do not forget to call the base class version! @@ -208,6 +217,15 @@ public: // for it static wxAppTraits *GetTraitsIfExists(); + // returns the main event loop instance, i.e. the event loop which is started + // by OnRun() and which dispatches all events sent from the native toolkit + // to the application (except when new event loops are temporarily set-up). + // The returned value maybe NULL. Put initialization code which needs a + // non-NULL main event loop into OnEventLoopEnter(). + wxEventLoopBase* GetMainLoop() const + { return m_mainLoop; } + + // event processing functions // -------------------------- @@ -220,7 +238,21 @@ public: // had been already processed or won't be processed at all, respectively virtual int FilterEvent(wxEvent& event); + // return true if we're running event loop, i.e. if the events can + // (already) be dispatched + static bool IsMainLoopRunning(); + #if wxUSE_EXCEPTIONS + // execute the functor to handle the given event + // + // this is a generalization of HandleEvent() below and the base class + // implementation of CallEventHandler() still calls HandleEvent() for + // compatibility for functors which are just wxEventFunctions (i.e. methods + // of wxEvtHandler) + virtual void CallEventHandler(wxEvtHandler *handler, + wxEventFunctor& functor, + wxEvent& event) const; + // call the specified handler on the given object with the given event // // this method only exists to allow catching the exceptions thrown by any @@ -235,16 +267,26 @@ public: // exit, if you need to really handle the exceptions you need to override // OnExceptionInMainLoop() virtual void OnUnhandledException(); + + // Function called if an uncaught exception is caught inside the main + // event loop: it may return true to continue running the event loop or + // false to stop it (in the latter case it may rethrow the exception as + // well) + virtual bool OnExceptionInMainLoop(); + #endif // wxUSE_EXCEPTIONS - // event processing functions - // -------------------------- - // return true if we're running event loop, i.e. if the events can - // (already) be dispatched - static bool IsMainLoopRunning(); + // pending events + // -------------- + + // IMPORTANT: all these methods conceptually belong to wxEventLoopBase + // but for many reasons we need to allow queuing of events + // even when there's no event loop (e.g. in wxApp::OnInit); + // this feature is used e.g. to queue events on secondary threads + // or in wxPython to use wx.CallAfter before the GUI is initialized - // process all events in the wxHandlersWithPendingEvents list -- it is necessary + // process all events in the m_handlersWithPendingEvents 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. @@ -253,42 +295,42 @@ public: // check if there are pending events on global pending event list bool HasPendingEvents() const; - // doesn't do anything in this class, just a hook for GUI wxApp - virtual bool Yield(bool WXUNUSED(onlyIfNeeded) = false) { return true; } + // temporary suspends processing of the pending events + void SuspendProcessingOfPendingEvents(); - // make sure that idle events are sent again - virtual void WakeUpIdle(); + // resume processing of the pending events previously stopped because of a + // call to SuspendProcessingOfPendingEvents() + void ResumeProcessingOfPendingEvents(); - // execute the main GUI loop, the function returns when the loop ends - virtual int MainLoop(); + // called by ~wxEvtHandler to (eventually) remove the handler from the list of + // the handlers with pending events + void RemovePendingEventHandler(wxEvtHandler* toRemove); - // exit the main GUI loop during the next iteration (i.e. it does not - // stop the program immediately!) - virtual void ExitMainLoop(); + // adds an event handler to the list of the handlers with pending events + void AppendPendingEventHandler(wxEvtHandler* toAppend); - // returns true if there are unprocessed events in the event queue - virtual bool Pending(); + // 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); - // process the first event in the event queue (blocks until an event - // appears if there are none currently, use Pending() if this is not - // wanted), returns false if the event loop should stop and true - // otherwise + // deletes the current pending events + void DeletePendingEvents(); + + + // wxEventLoop redirections + // ------------------------ + + virtual bool Pending(); virtual bool Dispatch(); - // 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 int MainLoop(); + virtual void ExitMainLoop(); + + bool Yield(bool onlyIfNeeded = false); + + virtual void WakeUpIdle(); virtual bool ProcessIdle(); -#if wxUSE_EXCEPTIONS - // Function called if an uncaught exception is caught inside the main - // event loop: it may return true to continue running the event loop or - // false to stop it (in the latter case it may rethrow the exception as - // well) - virtual bool OnExceptionInMainLoop(); -#endif // wxUSE_EXCEPTIONS // debugging support // ----------------- @@ -356,7 +398,6 @@ protected: // for the first time virtual wxAppTraits *CreateTraits(); - // function used for dynamic wxApp creation static wxAppInitializerFunction ms_appInitFn; @@ -382,9 +423,32 @@ protected: // been started yet or has already terminated) wxEventLoopBase *m_mainLoop; + + // pending events management vars: + + // the array of the handlers with pending events which needs to be processed + // inside ProcessPendingEvents() + wxEvtHandlerArray m_handlersWithPendingEvents; + + // helper array used by ProcessPendingEvents() to store the event handlers + // which have pending events but of these events none can be processed right now + // (because of a call to wxEventLoop::YieldFor() which asked to selectively process + // pending events) + wxEvtHandlerArray m_handlersWithPendingDelayedEvents; + +#if wxUSE_THREADS + // this critical section protects both the lists above + wxCriticalSection m_handlersWithPendingEventsLocker; +#endif + + // flag modified by Suspend/ResumeProcessingOfPendingEvents() + bool m_bDoPendingEventProcessing; + + friend class WXDLLIMPEXP_FWD_BASE wxEvtHandler; + // the application object is a singleton anyhow, there is no sense in // copying it - DECLARE_NO_COPY_CLASS(wxAppConsoleBase) + wxDECLARE_NO_COPY_CLASS(wxAppConsoleBase); }; #if defined(__UNIX__) @@ -441,22 +505,9 @@ public: // the worker functions - usually not used directly by the user code // ----------------------------------------------------------------- - - - // 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! - virtual bool Yield(bool onlyIfNeeded = false) = 0; - - // returns true if the main thread is inside a Yield() call - bool IsYielding() const - { return m_isInsideYield; } + // safer alternatives to Yield(), using wxWindowDisabler + virtual bool SafeYield(wxWindow *win, bool onlyIfNeeded); + virtual bool SafeYieldFor(wxWindow *win, long eventsToProcess); // this virtual function is called in the GUI mode when the application // becomes idle and normally just sends wxIdleEvent to all interested @@ -580,9 +631,7 @@ protected: // does any of our windows have focus? bool m_isActive; - bool m_isInsideYield; - - DECLARE_NO_COPY_CLASS(wxAppBase) + wxDECLARE_NO_COPY_CLASS(wxAppBase); }; #if WXWIN_COMPATIBILITY_2_6 @@ -648,20 +697,20 @@ protected: // ------------------------------------------------------ // Force an exit from main loop -extern void WXDLLIMPEXP_BASE wxExit(); +WXDLLIMPEXP_BASE void wxExit(); -// avoid redeclaring this function here if it had been already declated by +// avoid redeclaring this function here if it had been already declared by // wx/utils.h, this results in warnings from g++ with -Wredundant-decls #ifndef wx_YIELD_DECLARED #define wx_YIELD_DECLARED // Yield to other apps/messages -extern bool WXDLLIMPEXP_BASE wxYield(); +WXDLLIMPEXP_CORE bool wxYield(); #endif // wx_YIELD_DECLARED // Yield to other apps/messages -extern void WXDLLIMPEXP_BASE wxWakeUpIdle(); +WXDLLIMPEXP_BASE void wxWakeUpIdle(); // ---------------------------------------------------------------------------- // macros for dynamic creation of the application object