X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/12028905135250524409f1e7b9bfa9c55e5ce16b..dd9f8b6bb6935360a8271dc3e8749fb026b601a8:/include/wx/evtloop.h?ds=sidebyside diff --git a/include/wx/evtloop.h b/include/wx/evtloop.h index 354a553483..f6d1b55313 100644 --- a/include/wx/evtloop.h +++ b/include/wx/evtloop.h @@ -12,51 +12,215 @@ #ifndef _WX_EVTLOOP_H_ #define _WX_EVTLOOP_H_ -#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) - #pragma interface "evtloop.h" -#endif +#include "wx/utils.h" // ---------------------------------------------------------------------------- -// wxEventLoop: a GUI event loop +// wxEventLoopBase: interface for wxEventLoop // ---------------------------------------------------------------------------- -class WXDLLEXPORT wxEventLoop +class WXDLLIMPEXP_BASE wxEventLoopBase { public: - // ctor - wxEventLoop() { m_impl = NULL; } + // trivial, but needed (because of wxEventLoopBase) ctor + wxEventLoopBase() { } // dtor - virtual ~wxEventLoop(); + virtual ~wxEventLoopBase() { } + + // use this to check whether the event loop was successfully created before + // using it + virtual bool IsOk() const { return true; } // 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(); + // dispatch a single event, return false if we should exit from the loop + virtual bool Dispatch() = 0; - // is the event loop running now? - virtual bool IsRunning() const; - // 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) { 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; + + // 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; protected: - // the pointer to the port specific implementation class - class WXDLLEXPORT wxEventLoopImpl *m_impl; + // 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 wxEventLoop *ms_activeLoop; + static wxEventLoopBase *ms_activeLoop; + + DECLARE_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 + virtual void Exit(int rc = 0); + +protected: + // 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" +#elif defined(__WXDFB__) + #include "wx/dfb/evtloop.h" +#else // other platform + +class WXDLLIMPEXP_FWD_CORE wxEventLoopImpl; + +class WXDLLEXPORT wxGUIEventLoop : public wxEventLoopBase +{ +public: + wxGUIEventLoop() { m_impl = NULL; } + virtual ~wxGUIEventLoop(); + + virtual int Run(); + virtual void Exit(int rc = 0); + virtual bool Pending() const; + virtual bool Dispatch(); + virtual void WakeUp() { } + +protected: + // the pointer to the port specific implementation class + wxEventLoopImpl *m_impl; + + DECLARE_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 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 +// ---------------------------------------------------------------------------- + +// this is a naive generic implementation which uses wxWindowDisabler to +// 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 wxGUIEventLoop +{ +public: + wxModalEventLoop(wxWindow *winModal) + { + m_windowDisabler = new wxWindowDisabler(winModal); + } + +protected: + virtual void OnExit() + { + delete m_windowDisabler; + m_windowDisabler = NULL; + + wxGUIEventLoop::OnExit(); + } + +private: + wxWindowDisabler *m_windowDisabler; +}; + +#endif //wxUSE_GUI + +// ---------------------------------------------------------------------------- +// 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(wxEventLoopBase *evtLoop) + { + m_evtLoopOld = wxEventLoopBase::GetActive(); + wxEventLoopBase::SetActive(evtLoop); + } + + ~wxEventLoopActivator() + { + // restore the previously active event loop + wxEventLoopBase::SetActive(m_evtLoopOld); + } - DECLARE_NO_COPY_CLASS(wxEventLoop) +private: + wxEventLoopBase *m_evtLoopOld; }; #endif // _WX_EVTLOOP_H_