add ability to create wxEnhMetaFileDC based on a reference DC

[wxWidgets.git] / src / unix / evtloopunix.cpp

diff --git a/src/unix/evtloopunix.cpp b/src/unix/evtloopunix.cpp
index 5bd8b1050f6b2dae19ccdd3aa8cc58054afa9384..4edf70e6969dbaed9077ecacd548510efe8bf811 100644 (file)
--- a/src/unix/evtloopunix.cpp
+++ b/src/unix/evtloopunix.cpp
@@ -21,15 +21,18 @@
 
 #if wxUSE_CONSOLE_EVENTLOOP
 
+#include "wx/evtloop.h"
+
 #ifndef WX_PRECOMP
     #include "wx/app.h"
     #include "wx/log.h"
 #endif
 
 #include <errno.h>
-#include "wx/evtloop.h"
+#include "wx/apptrait.h"
 #include "wx/thread.h"
 #include "wx/module.h"
+#include "wx/unix/pipe.h"
 #include "wx/unix/private/timer.h"
 #include "wx/unix/private/epolldispatcher.h"
 #include "wx/private/selectdispatcher.h"
@@ -40,11 +43,39 @@
 // wxEventLoop::PipeIOHandler implementation
 // ===========================================================================
 
+namespace wxPrivate
+{
+
+// pipe used for wake up messages: when a child thread wants to wake up
+// the event loop in the main thread it writes to this pipe
+class PipeIOHandler : public wxFDIOHandler
+{
+public:
+    // default ctor does nothing, call Create() to really initialize the
+    // object
+    PipeIOHandler() { }
+
+    bool Create();
+
+    // this method can be, and normally is, called from another thread
+    void WakeUp();
+
+    int GetReadFd() { return m_pipe[wxPipe::Read]; }
+
+    // implement wxFDIOHandler pure virtual methods
+    virtual void OnReadWaiting();
+    virtual void OnWriteWaiting() { }
+    virtual void OnExceptionWaiting() { }
+
+private:
+    wxPipe m_pipe;
+};
+
 // ----------------------------------------------------------------------------
 // initialization
 // ----------------------------------------------------------------------------
 
-bool wxConsoleEventLoop::PipeIOHandler::Create()
+bool PipeIOHandler::Create()
 {
     if ( !m_pipe.Create() )
     {
@@ -71,7 +102,7 @@ bool wxConsoleEventLoop::PipeIOHandler::Create()
 // wakeup handling
 // ----------------------------------------------------------------------------
 
-void wxConsoleEventLoop::PipeIOHandler::WakeUp()
+void PipeIOHandler::WakeUp()
 {
     if ( write(m_pipe[wxPipe::Write], "s", 1) != 1 )
     {
@@ -81,17 +112,17 @@ void wxConsoleEventLoop::PipeIOHandler::WakeUp()
     }
 }
 
-void wxConsoleEventLoop::PipeIOHandler::OnReadWaiting()
+void PipeIOHandler::OnReadWaiting()
 {
     // got wakeup from child thread: read all data available in pipe just to
-    // make it empty (evevn though we write one byte at a time from WakeUp(),
+    // make it empty (even though we write one byte at a time from WakeUp(),
     // it could have been called several times)
     char buf[4];
     for ( ;; )
     {
         const int size = read(GetReadFd(), buf, WXSIZEOF(buf));
 
-        if ( size == 0 || (size == -1 && errno == EAGAIN) )
+        if ( size == 0 || (size == -1 && (errno == EAGAIN || errno == EINTR)) )
         {
             // nothing left in the pipe (EAGAIN is expected for an FD with
             // O_NONBLOCK)
@@ -106,9 +137,13 @@ void wxConsoleEventLoop::PipeIOHandler::OnReadWaiting()
         }
     }
 
-    wxTheApp->ProcessPendingEvents();
+    // writing to the wake up pipe will make wxConsoleEventLoop return from
+    // wxFDIODispatcher::Dispatch() it might be currently blocking in, nothing
+    // else needs to be done
 }
 
+} // namespace wxPrivate
+
 // ===========================================================================
 // wxEventLoop implementation
 // ===========================================================================
@@ -119,8 +154,10 @@ void wxConsoleEventLoop::PipeIOHandler::OnReadWaiting()
 
 wxConsoleEventLoop::wxConsoleEventLoop()
 {
-    if ( !m_wakeupPipe.Create() )
+    m_wakeupPipe = new wxPrivate::PipeIOHandler();
+    if ( !m_wakeupPipe->Create() )
     {
+        wxDELETE(m_wakeupPipe);
         m_dispatcher = NULL;
         return;
     }
@@ -131,58 +168,81 @@ wxConsoleEventLoop::wxConsoleEventLoop()
 
     m_dispatcher->RegisterFD
                   (
-                    m_wakeupPipe.GetReadFd(),
-                    &m_wakeupPipe,
+                    m_wakeupPipe->GetReadFd(),
+                    m_wakeupPipe,
                     wxFDIO_INPUT
                   );
 }
 
+wxConsoleEventLoop::~wxConsoleEventLoop()
+{
+    delete m_wakeupPipe;
+}
+
 //-----------------------------------------------------------------------------
 // events dispatch and loop handling
 //-----------------------------------------------------------------------------
 
 bool wxConsoleEventLoop::Pending() const
 {
-    return wxTheApp->HasPendingEvents();
+    if ( m_dispatcher->HasPending() )
+        return true;
+
+#if wxUSE_TIMER
+    wxUsecClock_t nextTimer;
+    if ( wxTimerScheduler::Get().GetNext(&nextTimer) &&
+            !wxMilliClockToLong(nextTimer) )
+        return true;
+#endif // wxUSE_TIMER
+
+    return false;
 }
 
 bool wxConsoleEventLoop::Dispatch()
 {
-    wxTheApp->ProcessPendingEvents();
-    return true;
-}
+    DispatchTimeout(wxFDIODispatcher::TIMEOUT_INFINITE);
 
-void wxConsoleEventLoop::WakeUp()
-{
-    m_wakeupPipe.WakeUp();
+    return true;
 }
 
-void wxConsoleEventLoop::OnNextIteration()
+int wxConsoleEventLoop::DispatchTimeout(unsigned long timeout)
 {
-    // calculate the timeout until the next timer expiration
-    int timeout;
-
 #if wxUSE_TIMER
+    // check if we need to decrease the timeout to account for a timer
     wxUsecClock_t nextTimer;
     if ( wxTimerScheduler::Get().GetNext(&nextTimer) )
     {
-        // timeout is in ms
-        timeout = (nextTimer / 1000).ToLong();
+        unsigned long timeUntilNextTimer = wxMilliClockToLong(nextTimer / 1000);
+        if ( timeUntilNextTimer < timeout )
+            timeout = timeUntilNextTimer;
     }
-    else // no timers, we can block forever
 #endif // wxUSE_TIMER
-    {
-        timeout = wxFDIODispatcher::TIMEOUT_INFINITE;
-    }
 
-    m_dispatcher->Dispatch(timeout);
+    bool hadEvent = m_dispatcher->Dispatch(timeout) > 0;
 
 #if wxUSE_TIMER
-    wxTimerScheduler::Get().NotifyExpired();
-#endif
+    if ( wxTimerScheduler::Get().NotifyExpired() )
+        hadEvent = true;
+#endif // wxUSE_TIMER
+
+    return hadEvent ? 1 : -1;
+}
+
+void wxConsoleEventLoop::WakeUp()
+{
+    m_wakeupPipe->WakeUp();
+}
 
+void wxConsoleEventLoop::OnNextIteration()
+{
     // call the signal handlers for any signals we caught recently
     wxTheApp->CheckSignal();
 }
 
+
+wxEventLoopBase *wxConsoleAppTraits::CreateEventLoop()
+{
+    return new wxEventLoop();
+}
+
 #endif // wxUSE_CONSOLE_EVENTLOOP