moved wxOverlay into overlay.* files and out of dc.h/dcbase.cpp; implemented wxOverlay for wxDirectFB port

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42340 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/overlay.h

@@ -0,0 +1,99 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/overlay.h
+// Purpose:     wxOverlay class
+// Author:      Stefan Csomor
+// Modified by:
+// Created:     2006-10-20
+// RCS-ID:      $Id$
+// Copyright:   (c) wxWidgets team
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_OVERLAY_H_
+#define _WX_OVERLAY_H_
+
+#include "wx/defs.h"
+
+#ifndef wxHAS_NATIVE_OVERLAY
+    #if defined(wxMAC_USE_CORE_GRAPHICS) && wxMAC_USE_CORE_GRAPHICS
+        #define wxHAS_NATIVE_OVERLAY 1
+    #elif defined(__WXDFB__)
+        #define wxHAS_NATIVE_OVERLAY 1
+    #else
+        #define wxHAS_NATIVE_OVERLAY 0
+    #endif
+#endif
+
+// ----------------------------------------------------------------------------
+// creates an overlay over an existing window, allowing for manipulations like
+// rubberbanding etc. This API is not stable yet, not to be used outside wx
+// internal code
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxOverlayImpl;
+class WXDLLEXPORT wxWindowDC;
+
+class WXDLLEXPORT wxOverlay
+{
+public:
+    wxOverlay();
+    ~wxOverlay();
+
+    // clears the overlay without restoring the former state
+    // to be done eg when the window content has been changed and repainted
+    void Reset();
+
+    // returns (port-specific) implementation of the overlay
+    wxOverlayImpl *GetImpl() { return m_impl; }
+
+private:
+    friend class WXDLLEXPORT wxDCOverlay;
+
+    // returns true if it has been setup
+    bool IsOk();
+
+    void Init(wxWindowDC* dc, int x , int y , int width , int height);
+
+    void BeginDrawing(wxWindowDC* dc);
+
+    void EndDrawing(wxWindowDC* dc);
+
+    void Clear(wxWindowDC* dc);
+
+    wxOverlayImpl* m_impl;
+
+    bool m_inDrawing;
+
+
+    DECLARE_NO_COPY_CLASS(wxOverlay)
+};
+
+
+class WXDLLEXPORT wxDCOverlay
+{
+public:
+    // connects this overlay to the corresponding drawing dc, if the overlay is
+    // not initialized yet this call will do so
+    wxDCOverlay(wxOverlay &overlay, wxWindowDC *dc, int x , int y , int width , int height);
+
+    // convenience wrapper that behaves the same using the entire area of the dc
+    wxDCOverlay(wxOverlay &overlay, wxWindowDC *dc);
+
+    // removes the connection between the overlay and the dc
+    virtual ~wxDCOverlay();
+
+    // clears the layer, restoring the state at the last init
+    void Clear();
+
+private:
+    void Init(wxWindowDC *dc, int x , int y , int width , int height);
+
+    wxOverlay& m_overlay;
+
+    wxWindowDC* m_dc;
+
+
+    DECLARE_NO_COPY_CLASS(wxDCOverlay)
+};
+
+#endif // _WX_OVERLAY_H_