initial (not yet working) code for DirectFB port

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40865 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/dfb/evtloop.cpp

@@ -0,0 +1,157 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        src/dfb/evtloop.cpp
+// Purpose:     wxEventLoop implementation
+// Author:      Vaclav Slavik
+// Created:     2006-08-16
+// RCS-ID:      $Id$
+// Copyright:   (c) 2006 REA Elektronik GmbH
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+// ===========================================================================
+// declarations
+// ===========================================================================
+
+// ---------------------------------------------------------------------------
+// headers
+// ---------------------------------------------------------------------------
+
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#include "wx/evtloop.h"
+
+#ifndef WX_PRECOMP
+    #include "wx/app.h"
+#endif
+
+#include "wx/timer.h"
+#include "wx/dfb/private.h"
+
+#define TRACE_EVENTS _T("events")
+
+// ===========================================================================
+// implementation
+// ===========================================================================
+
+//-----------------------------------------------------------------------------
+// wxEventLoop initialization
+//-----------------------------------------------------------------------------
+
+IDirectFBEventBufferPtr wxEventLoop::ms_buffer;
+
+wxEventLoop::wxEventLoop()
+{
+    if ( !ms_buffer )
+        InitBuffer();
+}
+
+/* static */
+void wxEventLoop::InitBuffer()
+{
+    IDirectFBPtr dfb(wxTheApp->GetDirectFBInterface());
+    DFB_CALL( dfb->CreateEventBuffer(dfb, &ms_buffer) );
+}
+
+/* static */
+IDirectFBEventBufferPtr wxEventLoop::GetDirectFBEventBuffer()
+{
+    if ( !ms_buffer )
+        InitBuffer();
+
+    return ms_buffer;
+}
+
+//-----------------------------------------------------------------------------
+// events dispatch and loop handling
+//-----------------------------------------------------------------------------
+
+bool wxEventLoop::Pending() const
+{
+    wxCHECK_MSG( ms_buffer, false, _T("invalid event buffer") );
+
+    // returns DFB_OK if there is >=1 event, DFB_BUFFER_EMPTY otherwise
+    return ms_buffer->HasEvent(ms_buffer) == DFB_OK;
+}
+
+bool wxEventLoop::Dispatch()
+{
+    wxCHECK_MSG( ms_buffer, false, _T("invalid event buffer") );
+
+    // NB: we don't block indefinitely waiting for an event, but instead
+    //     time out after a brief period in order to make sure that
+    //     OnNextIteration() will be called frequently enough
+    //
+    //     FIXME: call NotifyTimers() from here (and loop) instead?
+    const int TIMEOUT = 100;
+
+    DFBResult ret = ms_buffer->WaitForEventWithTimeout(ms_buffer, 0, TIMEOUT);
+
+    switch ( ret )
+    {
+        case DFB_OK:
+        {
+            wxDFBEvent e;
+            ms_buffer->GetEvent(ms_buffer, &e);
+            HandleDFBEvent(e);
+            break;
+        }
+
+        case DFB_TIMEOUT:
+            // timed out, pretend we processed an event so that OnNextIteration
+            // is called
+            break;
+
+        default:
+            // report any errors, but don't terminate the loop due to them
+            wxDfbCheckReturn(ret);
+            break;
+    }
+
+    return true;
+}
+
+void wxEventLoop::WakeUp()
+{
+    wxCHECK_RET( ms_buffer, _T("invalid event buffer") );
+
+    DFB_CALL( ms_buffer->WakeUp(ms_buffer) );
+}
+
+void wxEventLoop::OnNextIteration()
+{
+#if wxUSE_TIMER
+    // see the comment in Dispatch
+    wxTimer::NotifyTimers();
+#endif
+}
+
+#warning "FIXME: cleanup wxEventLoop::ms_buffer before exiting"
+
+
+//-----------------------------------------------------------------------------
+// DirectFB -> wxWidgets events translation
+//-----------------------------------------------------------------------------
+
+void wxEventLoop::HandleDFBEvent(const wxDFBEvent& event)
+{
+    switch ( event.GetClass() )
+    {
+        case DFEC_WINDOW:
+        {
+            wxDFBWindowEvent winevent(((const DFBEvent&)event).window);
+            wxTopLevelWindowDFB::HandleDFBWindowEvent(winevent);
+            break;
+        }
+
+        case DFEC_NONE:
+        case DFEC_INPUT:
+        case DFEC_USER:
+        case DFEC_UNIVERSAL:
+        {
+            wxLogTrace(TRACE_EVENTS,
+                       _T("ignoring event of unsupported class %i"),
+                       (int)event.GetClass());
+        }
+    }
+}