1. fixes to wxDC deleting logic (should fix ~wxPrinterDC leak), some code

reorganized/removed
2. applied (slightly modified) wxEnhMetaFileSimpleDataObject patch


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9687 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/enhmeta.h

@@ -94,12 +94,12 @@ private:
     DECLARE_DYNAMIC_CLASS(wxEnhMetaFileDC)
 };
 
+#if wxUSE_DRAG_AND_DROP
+
 // ----------------------------------------------------------------------------
 // wxEnhMetaFileDataObject is a specialization of wxDataObject for enh metafile
 // ----------------------------------------------------------------------------
 
-#if wxUSE_DRAG_AND_DROP
-
 // notice that we want to support both CF_METAFILEPICT and CF_ENHMETAFILE and
 // so we derive from wxDataObject and not from wxDataObjectSimple
 class WXDLLEXPORT wxEnhMetaFileDataObject : public wxDataObject
@@ -130,6 +130,38 @@ protected:
     wxEnhMetaFile m_metafile;
 };
 
+
+// ----------------------------------------------------------------------------
+// wxEnhMetaFileSimpleDataObject does derive from wxDataObjectSimple which
+// makes it more convenient to use (it can be used with wxDataObjectComposite)
+// at the price of not supoprting any more CF_METAFILEPICT but only
+// CF_ENHMETAFILE
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxEnhMetaFileSimpleDataObject : public wxDataObjectSimple
+{
+public:
+    // ctors
+    wxEnhMetaFileSimpleDataObject() : wxDataObjectSimple(wxDF_ENHMETAFILE) { }
+    wxEnhMetaFileSimpleDataObject(const wxEnhMetaFile& metafile)
+        : wxDataObjectSimple(wxDF_ENHMETAFILE), m_metafile(metafile) { }
+
+    // virtual functions which you may override if you want to provide data on
+    // demand only - otherwise, the trivial default versions will be used
+    virtual void SetEnhMetafile(const wxEnhMetaFile& metafile)
+        { m_metafile = metafile; }
+    virtual wxEnhMetaFile GetEnhMetafile() const
+        { return m_metafile; }
+
+    // implement base class pure virtuals
+    virtual size_t GetDataSize() const;
+    virtual bool GetDataHere(void *buf) const;
+    virtual bool SetData(size_t len, const void *buf);
+
+protected:
+    wxEnhMetaFile m_metafile;
+};
+
 #endif // wxUSE_DRAG_AND_DROP
 
 #endif // _WX_MSW_ENHMETA_H_