added wxConvFileName which is a variable, not define as wxConvFile; added comments...

[wxWidgets.git] / include / wx / dcbuffer.h

diff --git a/include/wx/dcbuffer.h b/include/wx/dcbuffer.h
index 37988bef0404d9b66afbe7c765ffd38724a03654..cac6228a8e30413b7213803c1873e9b0a6b17c70 100644 (file)
--- a/include/wx/dcbuffer.h
+++ b/include/wx/dcbuffer.h
@@ -12,56 +12,79 @@
 #ifndef _WX_DCBUFFER_H_
 #define _WX_DCBUFFER_H_
 
 #ifndef _WX_DCBUFFER_H_
 #define _WX_DCBUFFER_H_
 

-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-    #pragma interface "dcbuffer.h"
-#endif
-

 #include "wx/dcmemory.h"
 #include "wx/dcclient.h"
 #include "wx/dcmemory.h"
 #include "wx/dcclient.h"

-
-// flags for wxBufferedDC ctor/Init()
-enum
-{
-    // this is more efficient and hence default
-    wxBUFFER_DC_OVERWRITE_BG = 0,
-
-    // preserve the old background: more time consuming
-    wxBUFFER_DC_PRESERVE_BG = 1,
-
-
-    // flags used by default
-    wxBUFFER_DC_DEFAULT = wxBUFFER_DC_PRESERVE_BG
-};
+#include "wx/window.h"

 
 // ----------------------------------------------------------------------------
 // Double buffering helper.
 // ----------------------------------------------------------------------------
 
 
 // ----------------------------------------------------------------------------
 // Double buffering helper.
 // ----------------------------------------------------------------------------
 

-class WXDLLIMPEXP_ADV wxBufferedDC : public wxMemoryDC
+// Assumes the buffer bitmap covers the entire scrolled window,
+// and prepares the window DC accordingly
+#define wxBUFFER_VIRTUAL_AREA       0x01
+
+// Assumes the buffer bitmap only covers the client area;
+// does not prepare the window DC
+#define wxBUFFER_CLIENT_AREA        0x02
+
+class wxBufferedDC : public wxMemoryDC

 {
 public:
     // Default ctor, must subsequently call Init for two stage construction.
 {
 public:
     // Default ctor, must subsequently call Init for two stage construction.

-    wxBufferedDC() : m_dc( 0 )
+    wxBufferedDC() : m_dc( 0 ), m_style(0)

     {
     }
 
     // Construct a wxBufferedDC using a user supplied buffer.
     {
     }
 
     // Construct a wxBufferedDC using a user supplied buffer.

-    wxBufferedDC(wxDC *dc, const wxBitmap &buffer);
+    wxBufferedDC(wxDC *dc,
+                 const wxBitmap &buffer = wxNullBitmap,
+                 int style = wxBUFFER_CLIENT_AREA)
+        : m_dc( dc ),
+          m_buffer( buffer ),
+          m_style(style)
+    {
+        UseBuffer();
+    }

 
     // Construct a wxBufferedDC with an internal buffer of 'area'
     // (where area is usually something like the size of the window
     // being buffered)
 
     // Construct a wxBufferedDC with an internal buffer of 'area'
     // (where area is usually something like the size of the window
     // being buffered)

-    wxBufferedDC(wxDC *dc, const wxSize &area, int flags = wxBUFFER_DC_DEFAULT);
+    wxBufferedDC(wxDC *dc, const wxSize &area, int style = wxBUFFER_CLIENT_AREA)
+        : m_dc( dc ),
+          m_buffer( area.GetWidth(), area.GetHeight() ),
+          m_style(style)
+
+    {
+        UseBuffer();
+    }

 
     // default copy ctor ok.
 
     // The usually desired  action in the dtor is to blit the buffer.
 
     // default copy ctor ok.
 
     // The usually desired  action in the dtor is to blit the buffer.

-    virtual ~wxBufferedDC() { if ( m_dc ) UnMask(); }
+    virtual ~wxBufferedDC()
+    {
+        if ( m_dc ) UnMask();
+    }

 
     // These reimplement the actions of the ctors for two stage creation, but
     // are not used by the ctors themselves to save a few cpu cycles.
 
     // These reimplement the actions of the ctors for two stage creation, but
     // are not used by the ctors themselves to save a few cpu cycles.

-    void Init(wxDC *dc, const wxBitmap &bitmap);
-    void Init(wxDC *dc, const wxSize &area, int flags = wxBUFFER_DC_DEFAULT);
+    void Init(wxDC *dc,
+              const wxBitmap &buffer=wxNullBitmap,
+              int style = wxBUFFER_CLIENT_AREA)
+    {
+        wxASSERT_MSG( m_dc == 0 && m_buffer == wxNullBitmap,
+                      _T("wxBufferedDC already initialised") );
+        m_dc = dc;
+        m_buffer = buffer;
+        m_style = style;
+        UseBuffer();
+    }
+
+    void Init(wxDC *dc, const wxSize &area, int style = wxBUFFER_CLIENT_AREA)
+    {
+        Init(dc, wxBitmap(area.GetWidth(), area.GetHeight()), style);
+    }

 
     // Blits the buffer to the dc, and detaches the dc from the buffer (so it
     // can be effectively used once only).
 
     // Blits the buffer to the dc, and detaches the dc from the buffer (so it
     // can be effectively used once only).


@@ -69,31 +92,52 @@ public:
     // Usually called in the dtor or by the dtor of derived classes if the
     // BufferedDC must blit before the derived class (which may own the dc it's
     // blitting to) is destroyed.
     // Usually called in the dtor or by the dtor of derived classes if the
     // BufferedDC must blit before the derived class (which may own the dc it's
     // blitting to) is destroyed.

-    void UnMask();
+    void UnMask()
+    {
+        wxASSERT_MSG( m_dc != 0,
+                      _T("No underlying DC associated with wxBufferedDC (anymore)") );
+
+        wxCoord x=0, y=0;
+
+        if (m_style & wxBUFFER_CLIENT_AREA)
+            GetDeviceOrigin(& x, & y);
+
+        m_dc->Blit( 0, 0,
+                    m_buffer.GetWidth(), m_buffer.GetHeight(), this,
+                    -x, -y );
+        m_dc = NULL;
+    }
+
+    // Set and get the style
+    void SetStyle(int style) { m_style = style; }
+    int GetStyle() const { return m_style; }

 
 private:
     // check that the bitmap is valid and use it
     void UseBuffer()
     {
 
 private:
     // check that the bitmap is valid and use it
     void UseBuffer()
     {

-        wxASSERT_MSG( m_buffer.Ok(), _T("invalid bitmap in wxBufferedDC") );
+        if (!m_buffer.Ok())
+        {
+            wxCoord w, h;
+            m_dc->GetSize(&w, &h);
+            m_buffer = wxBitmap(w, h);
+        }

 
         SelectObject(m_buffer);
     }
 
 
         SelectObject(m_buffer);
     }
 

-    // preserve the background if necessary
-    void SaveBg(const wxSize& area, int flags)
-    {
-        if ( flags & wxBUFFER_DC_PRESERVE_BG )
-        {
-            Blit(0, 0, area.GetWidth(), area.GetHeight(), m_dc, 0, 0);
-        }
-    }
+    // the underlying DC to which we copy everything drawn on this one in
+    // UnMask()
+    //
+    // NB: Without the existence of a wxNullDC, this must be a pointer, else it
+    //     could probably be a reference.
+    wxDC *m_dc;

 
 

-    // Without the existence of a wxNullDC, this must be
-    // a pointer, else it could probably be a reference.
-    wxDC       *m_dc;
+    // the buffer (selected in this DC)
+    wxBitmap m_buffer;

 
 

-    wxBitmap    m_buffer;
+    // the buffering style
+    int m_style;

 
     DECLARE_NO_COPY_CLASS(wxBufferedDC)
 };
 
     DECLARE_NO_COPY_CLASS(wxBufferedDC)
 };


@@ -105,22 +149,32 @@ private:
 
 // Creates a double buffered wxPaintDC, optionally allowing the
 // user to specify their own buffer to use.
 
 // Creates a double buffered wxPaintDC, optionally allowing the
 // user to specify their own buffer to use.

-class WXDLLIMPEXP_ADV wxBufferedPaintDC : public wxBufferedDC
+class wxBufferedPaintDC : public wxBufferedDC

 {
 public:
 {
 public:

-    // this ctor creates a bitmap of the size of the window for buffering
-    wxBufferedPaintDC(wxWindow *window, int flags = wxBUFFER_DC_DEFAULT)
-        : wxBufferedDC(&m_paintdc, window->GetClientSize(), flags),
-          m_paintdc(window)
+    // If no bitmap is supplied by the user, a temporary one will be created.
+    wxBufferedPaintDC(wxWindow *window, const wxBitmap& buffer, int style = wxBUFFER_CLIENT_AREA)
+        : m_paintdc(window)

     {
     {

-        Prepare(window);
+        // If we're buffering the virtual window, scale the paint DC as well
+        if (style & wxBUFFER_VIRTUAL_AREA)
+            window->PrepareDC( m_paintdc );
+
+        if( buffer != wxNullBitmap )
+            Init(&m_paintdc, buffer, style);
+        else
+            Init(&m_paintdc, window->GetClientSize(), style);

     }
 
     }
 

-    // the bitmap must be valid here
-    wxBufferedPaintDC(wxWindow *window, const wxBitmap& buffer)
-        : wxBufferedDC(&m_paintdc, buffer)
+    // If no bitmap is supplied by the user, a temporary one will be created.
+    wxBufferedPaintDC(wxWindow *window, int style = wxBUFFER_CLIENT_AREA)
+        : m_paintdc(window)

     {
     {

-        Prepare(window);
+        // If we're using the virtual window, scale the paint DC as well
+        if (style & wxBUFFER_VIRTUAL_AREA)
+            window->PrepareDC( m_paintdc );
+
+        Init(&m_paintdc, window->GetClientSize(), style);

     }
 
     // default copy ctor ok.
     }
 
     // default copy ctor ok.


@@ -133,12 +187,6 @@ public:
     }
 
 private:
     }
 
 private:

-    // prepare the underlying DC
-    void Prepare(wxWindow *window)
-    {
-        window->PrepareDC(m_paintdc);
-    }
-

     wxPaintDC m_paintdc;
 
     DECLARE_NO_COPY_CLASS(wxBufferedPaintDC)
     wxPaintDC m_paintdc;
 
     DECLARE_NO_COPY_CLASS(wxBufferedPaintDC)