implement event loop for console applications (heavily modified patch 1715735)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@46029 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/evtloop.h

@@ -17,10 +17,10 @@
 class WXDLLEXPORT wxEventLoop;
 
 // ----------------------------------------------------------------------------
-// wxEventLoop: a GUI event loop
+// wxEventLoopBase: interface for wxEventLoop
 // ----------------------------------------------------------------------------
 
-class WXDLLEXPORT wxEventLoopBase
+class WXDLLIMPEXP_BASE wxEventLoopBase
 {
 public:
     // trivial, but needed (because of wxEventLoopBase) ctor
@@ -29,6 +29,10 @@ public:
     // dtor
     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() = 0;
 
@@ -53,6 +57,10 @@ public:
     // 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:
     // this function should be called before the event loop terminates, whether
     // this happens normally (because of Exit() call) or abnormally (because of
@@ -66,13 +74,13 @@ protected:
     DECLARE_NO_COPY_CLASS(wxEventLoopBase)
 };
 
-#if defined(__WXMSW__) || defined(__WXMAC__) || defined(__WXDFB__)
+#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();
@@ -86,10 +94,6 @@ public:
     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() { }
@@ -121,28 +125,44 @@ protected:
 
 class WXDLLEXPORT wxEventLoopImpl;
 
-class WXDLLEXPORT wxEventLoop : public wxEventLoopBase
+class WXDLLEXPORT 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 void WakeUp() { }
 
 protected:
     // the pointer to the port specific implementation class
     wxEventLoopImpl *m_impl;
 
-    DECLARE_NO_COPY_CLASS(wxEventLoop)
+    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
+
+// cannot use typedef because wxEventLoop is forward-declared in many places
+#if wxUSE_GUI
+class wxEventLoop : public wxGUIEventLoop { };
+#elif defined(__WXMSW__) || defined(__UNIX__)
+class wxEventLoop : public wxConsoleEventLoop { };
+#else // we still must define it somehow for the code below...
+class wxEventLoop : public wxEventLoopBase { };
+#endif
+
 inline bool wxEventLoopBase::IsRunning() const { return GetActive() == this; }
 
+#if wxUSE_GUI
 // ----------------------------------------------------------------------------
 // wxModalEventLoop
 // ----------------------------------------------------------------------------
@@ -151,7 +171,7 @@ 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 WXDLLEXPORT wxModalEventLoop : public wxGUIEventLoop
 {
 public:
     wxModalEventLoop(wxWindow *winModal)
@@ -165,13 +185,15 @@ protected:
         delete m_windowDisabler;
         m_windowDisabler = NULL;
 
-        wxEventLoop::OnExit();
+        wxGUIEventLoop::OnExit();
     }
 
 private:
     wxWindowDisabler *m_windowDisabler;
 };
 
+#endif //wxUSE_GUI
+
 // ----------------------------------------------------------------------------
 // wxEventLoopActivator: helper class for wxEventLoop implementations
 // ----------------------------------------------------------------------------
@@ -182,16 +204,16 @@ private:
 class wxEventLoopActivator
 {
 public:
-    wxEventLoopActivator(wxEventLoop *evtLoop)
+    wxEventLoopActivator(wxEventLoopBase *evtLoop)
     {
-        m_evtLoopOld = wxEventLoop::GetActive();
-        wxEventLoop::SetActive(evtLoop);
+        m_evtLoopOld = wxEventLoopBase::GetActive();
+        wxEventLoopBase::SetActive(wx_static_cast(wxEventLoop *, evtLoop));
     }
 
     ~wxEventLoopActivator()
     {
         // restore the previously active event loop
-        wxEventLoop::SetActive(m_evtLoopOld);
+        wxEventLoopBase::SetActive(m_evtLoopOld);
     }
 
 private: