Added wxBufferedDC class.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14651 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2002-03-17 06:34:06 +00:00
parent 33f71b3cf4
commit 67e2efca87
22 changed files with 276 additions and 0 deletions
--- a/src/generic/dcbuffer.cpp
+++ b/src/generic/dcbuffer.cpp
@@ -0,0 +1,103 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        dcbuffer.cpp
+// Purpose:     wxBufferedDC class
+// Author:      Ron Lee <ron@debian.org>
+// Modified by:
+// Created:     16/03/02
+// RCS-ID:      $Id$
+// Copyright:   (c) Ron Lee
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+
+#ifdef __GNUG__
+    #pragma implementation "dcbuffer.h"
+#endif
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+#include "wx/dcbuffer.h"
+
+
+// ==============================================================
+//   Double buffering helper.
+// --------------------------------------------------------------
+
+wxBufferedDC::wxBufferedDC( wxDC *dc, const wxBitmap &buffer )
+    : m_dc( dc )
+    , m_buffer( buffer )
+{
+    SelectObject( m_buffer );
+}
+
+wxBufferedDC::wxBufferedDC( wxDC *dc, const wxSize &area )
+    : m_dc( dc )
+    , m_buffer( area.GetWidth(), area.GetHeight() )
+{
+    SelectObject( m_buffer );
+}
+
+wxBufferedDC::~wxBufferedDC()
+{
+    if( m_dc != 0 )
+    {
+        UnMask();
+    }
+}
+
+void wxBufferedDC::Init( wxDC *dc, const wxBitmap &buffer )
+{
+    wxASSERT_MSG( m_dc == 0 && m_buffer == wxNullBitmap,
+                  _T("wxBufferedDC already initialised") );
+
+    m_dc = dc;
+    m_buffer = buffer;
+    SelectObject( m_buffer );
+}
+
+void wxBufferedDC::Init( wxDC *dc, const wxSize &area )
+{
+    wxASSERT_MSG( m_dc == 0 && m_buffer == wxNullBitmap,
+                  _T("wxBufferedDC already initialised") );
+
+    m_dc = dc;
+    m_buffer = wxBitmap( area.GetWidth(), area.GetHeight() );
+    SelectObject( m_buffer );
+}
+
+void wxBufferedDC::UnMask()
+{
+    wxASSERT_MSG( m_dc != 0, _T("No low level DC associated with buffer (anymore)") );
+
+    m_dc->Blit( 0, 0, m_buffer.GetWidth(), m_buffer.GetHeight(), this, 0, 0 );
+    m_dc = 0;
+}
+
+
+// ==============================================================
+//   Double buffered PaintDC.
+// --------------------------------------------------------------
+
+wxBufferedPaintDC::wxBufferedPaintDC( wxWindow *window, const wxBitmap &buffer )
+    : m_paintdc( window )
+{
+    window->PrepareDC( m_paintdc );
+
+    if( buffer != wxNullBitmap )
+        Init( &m_paintdc, buffer );
+    else
+        Init( &m_paintdc, window->GetClientSize() );
+}
+
+wxBufferedPaintDC::~wxBufferedPaintDC()
+{
+        // We must UnMask here, else by the time the base class
+        // does it, the PaintDC will have already been destroyed.
+
+    UnMask();
+}
+
+
+// vi:sts=4:sw=4:et