X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/1e04d2bf54dcb336e20a27e906dcebdca368790b..66c2bf7b1d9326fb650acfaae22ec50528cfbf7c:/include/wx/evtloop.h?ds=sidebyside

diff --git a/include/wx/evtloop.h b/include/wx/evtloop.h
index 82d81c331a..8dd5d6eb7b 100644
--- a/include/wx/evtloop.h
+++ b/include/wx/evtloop.h
@@ -4,7 +4,6 @@
 // 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
 ///////////////////////////////////////////////////////////////////////////////
@@ -15,6 +14,19 @@
 #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
     ------------------------------------------
@@ -61,12 +73,24 @@ public:
     // 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?
     //
@@ -75,7 +99,15 @@ public:
     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;
@@ -93,46 +125,16 @@ public:
     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();
@@ -141,25 +143,25 @@ public:
     // 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; }
 
@@ -173,38 +175,42 @@ public:
     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;
 
+private:
+    // this flag is set on entry into Run() and reset before leaving it
+    bool m_isInsideRun;
+
     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()
@@ -215,15 +221,15 @@ 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);
+    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() { }
@@ -232,8 +238,14 @@ protected:
     // 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
@@ -241,16 +253,32 @@ protected:
 // 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__)
@@ -267,8 +295,7 @@ public:
     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)
@@ -289,6 +316,8 @@ public:
     virtual bool YieldFor(long eventsToProcess);
 
 protected:
+    virtual int DoRun();
+
     // the pointer to the port specific implementation class
     wxEventLoopImpl *m_impl;
 
@@ -297,19 +326,16 @@ protected:
 
 #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
@@ -318,7 +344,7 @@ protected:
 
 inline bool wxEventLoopBase::IsRunning() const { return GetActive() == this; }
 
-#if wxUSE_GUI
+#if wxUSE_GUI && !defined(__WXOSX__)
 // ----------------------------------------------------------------------------
 // wxModalEventLoop
 // ----------------------------------------------------------------------------