X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/c8026dea6cf102fb741f132142f9d6584d3e0cef..9b49405777342458dc1666001865eef7309b6c30:/include/wx/evtloop.h?ds=inline diff --git a/include/wx/evtloop.h b/include/wx/evtloop.h index 59c2f5e5f2..8bea93090a 100644 --- a/include/wx/evtloop.h +++ b/include/wx/evtloop.h @@ -12,26 +12,71 @@ #ifndef _WX_EVTLOOP_H_ #define _WX_EVTLOOP_H_ +#include "wx/event.h" #include "wx/utils.h" -class WXDLLEXPORT wxEventLoop; +/* + NOTE ABOUT wxEventLoopBase::YieldFor LOGIC + ------------------------------------------ + + The YieldFor() function helps to avoid re-entrancy problems and problems + caused by out-of-order event processing + (see "wxYield-like problems" and "wxProgressDialog+threading BUG" wx-dev threads). + + The logic behind YieldFor() is simple: it analyzes the queue of the native + events generated by the underlying GUI toolkit and picks out and processes + only those matching the given mask. + + It's important to note that YieldFor() is used to selectively process the + events generated by the NATIVE toolkit. + Events syntethized by wxWidgets code or by user code are instead selectively + processed thanks to the logic built into wxEvtHandler::ProcessPendingEvents(). + In fact, when wxEvtHandler::ProcessPendingEvents gets called from inside a + YieldFor() call, wxEventLoopBase::IsEventAllowedInsideYield is used to decide + if the pending events for that event handler can be processed. + If all the pending events associated with that event handler result as "not processable", + the event handler "delays" itself calling wxEventLoopBase::DelayPendingEventHandler + (so it's moved: m_handlersWithPendingEvents => m_handlersWithPendingDelayedEvents). + Last, wxEventLoopBase::ProcessPendingEvents() before exiting moves the delayed + event handlers back into the list of handlers with pending events + (m_handlersWithPendingDelayedEvents => m_handlersWithPendingEvents) so that + a later call to ProcessPendingEvents() (possibly outside the YieldFor() call) + will process all pending events as usual. +*/ // ---------------------------------------------------------------------------- -// wxEventLoop: a GUI event loop +// wxEventLoopBase: interface for wxEventLoop // ---------------------------------------------------------------------------- -class WXDLLEXPORT wxEventLoopBase +class WXDLLIMPEXP_BASE wxEventLoopBase { public: // trivial, but needed (because of wxEventLoopBase) ctor - wxEventLoopBase() { } + wxEventLoopBase(); // dtor virtual ~wxEventLoopBase() { } + // use this to check whether the event loop was successfully created before + // using it + virtual bool IsOk() const { return true; } + + // returns true if this is the main loop + bool IsMain() const; + + + // dispatch&processing + // ------------------- + // start the event loop, return the exit code when it is finished virtual int Run() = 0; + // 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; + // exit from the loop with the given exit code virtual void Exit(int rc = 0) = 0; @@ -41,38 +86,91 @@ public: // 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; + + + // 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 wxEventLoop *GetActive() { return ms_activeLoop; } + static wxEventLoopBase *GetActive() { return ms_activeLoop; } // set currently active (running) event loop - static void SetActive(wxEventLoop* loop) { ms_activeLoop = loop; } + static void SetActive(wxEventLoopBase* 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 // an exception thrown from inside the loop) - virtual void OnExit() { } - + virtual void OnExit(); // the pointer to currently active loop - static wxEventLoop *ms_activeLoop; + static wxEventLoopBase *ms_activeLoop; - DECLARE_NO_COPY_CLASS(wxEventLoopBase) + // YieldFor() helpers: + bool m_isInsideYield; + long m_eventsToProcessInsideYield; + + wxDECLARE_NO_COPY_CLASS(wxEventLoopBase); }; -#if defined(__WXMSW__) || defined(__WXMAC__) +#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 WXDLLEXPORT wxEventLoopManual : public wxEventLoopBase +class WXDLLIMPEXP_BASE wxEventLoopManual : public wxEventLoopBase { public: wxEventLoopManual(); @@ -83,13 +181,9 @@ public: // sets the "should exit" flag and wakes up the loop so that it terminates // soon - virtual void Exit(int rc); + 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() { } @@ -114,33 +208,77 @@ protected: #elif defined(__WXMSW__) #include "wx/msw/evtloop.h" #elif defined(__WXMAC__) - #include "wx/mac/evtloop.h" + #include "wx/osx/evtloop.h" +#elif defined(__WXCOCOA__) + #include "wx/cocoa/evtloop.h" +#elif defined(__WXDFB__) + #include "wx/dfb/evtloop.h" +#elif defined(__WXGTK20__) + #include "wx/gtk/evtloop.h" #else // other platform -class WXDLLEXPORT wxEventLoopImpl; +#include "wx/stopwatch.h" // for wxMilliClock_t -class WXDLLEXPORT wxEventLoop : public wxEventLoopBase +class WXDLLIMPEXP_FWD_CORE wxEventLoopImpl; + +class WXDLLIMPEXP_CORE wxGUIEventLoop : public wxEventLoopBase { public: - wxEventLoop() { m_impl = NULL; } - virtual ~wxEventLoop(); + wxGUIEventLoop() { m_impl = NULL; } + virtual ~wxGUIEventLoop(); virtual int Run(); virtual void Exit(int rc = 0); virtual bool Pending() const; virtual bool Dispatch(); + virtual int DispatchTimeout(unsigned long timeout) + { + // TODO: this is, of course, horribly inefficient and a proper wait with + // timeout should be implemented for all ports natively... + const wxMilliClock_t timeEnd = wxGetLocalTimeMillis() + timeout; + for ( ;; ) + { + if ( Pending() ) + return Dispatch(); + + if ( wxGetLocalTimeMillis() >= timeEnd ) + return -1; + } + } + virtual void WakeUp() { } + virtual bool YieldFor(long eventsToProcess); protected: // the pointer to the port specific implementation class wxEventLoopImpl *m_impl; - DECLARE_NO_COPY_CLASS(wxEventLoop) + wxDECLARE_NO_COPY_CLASS(wxGUIEventLoop); }; #endif // platforms +// also include the header defining wxConsoleEventLoop for Unix systems +#if defined(__UNIX__) + #include "wx/unix/evtloop.h" +#endif + +// we use a class rather than a typedef because wxEventLoop is forward-declared +// in many places +#if wxUSE_GUI + class wxEventLoop : public wxGUIEventLoop { }; +#else // !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__)) + #define wxEventLoop wxConsoleEventLoop + #else // we still must define it somehow for the code below... + #define wxEventLoop wxEventLoopBase + #endif +#endif + inline bool wxEventLoopBase::IsRunning() const { return GetActive() == this; } +#if wxUSE_GUI // ---------------------------------------------------------------------------- // wxModalEventLoop // ---------------------------------------------------------------------------- @@ -149,7 +287,7 @@ inline bool wxEventLoopBase::IsRunning() const { return GetActive() == this; } // implement modality, we will surely need platform-specific implementations // too, this generic implementation is here only temporarily to see how it // works -class WXDLLEXPORT wxModalEventLoop : public wxEventLoop +class WXDLLIMPEXP_CORE wxModalEventLoop : public wxGUIEventLoop { public: wxModalEventLoop(wxWindow *winModal) @@ -163,13 +301,15 @@ protected: delete m_windowDisabler; m_windowDisabler = NULL; - wxEventLoop::OnExit(); + wxGUIEventLoop::OnExit(); } private: wxWindowDisabler *m_windowDisabler; }; +#endif //wxUSE_GUI + // ---------------------------------------------------------------------------- // wxEventLoopActivator: helper class for wxEventLoop implementations // ---------------------------------------------------------------------------- @@ -180,20 +320,50 @@ private: class wxEventLoopActivator { public: - wxEventLoopActivator(wxEventLoop *evtLoop) + wxEventLoopActivator(wxEventLoopBase *evtLoop) { - m_evtLoopOld = wxEventLoop::GetActive(); - wxEventLoop::SetActive(evtLoop); + m_evtLoopOld = wxEventLoopBase::GetActive(); + wxEventLoopBase::SetActive(evtLoop); } ~wxEventLoopActivator() { // restore the previously active event loop - wxEventLoop::SetActive(m_evtLoopOld); + wxEventLoopBase::SetActive(m_evtLoopOld); } private: - wxEventLoop *m_evtLoopOld; + wxEventLoopBase *m_evtLoopOld; }; +#if wxUSE_CONSOLE_EVENTLOOP + +class wxEventLoopGuarantor +{ +public: + wxEventLoopGuarantor() + { + m_evtLoopNew = NULL; + if (!wxEventLoop::GetActive()) + { + m_evtLoopNew = new wxEventLoop; + wxEventLoop::SetActive(m_evtLoopNew); + } + } + + ~wxEventLoopGuarantor() + { + if (m_evtLoopNew) + { + wxEventLoop::SetActive(NULL); + delete m_evtLoopNew; + } + } + +private: + wxEventLoop *m_evtLoopNew; +}; + +#endif // wxUSE_CONSOLE_EVENTLOOP + #endif // _WX_EVTLOOP_H_