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Added wxBUFFER_VIRTUAL_AREA, wxBUFFER_CLIENT_AREA to buffered DC

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32572 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Julian Smart
2005-03-03 06:56:15 +00:00
parent fb113b165e
commit 265a3864bb
3 changed files with 72 additions and 21 deletions
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64
include/wx/dcbuffer.h
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@@ -20,18 +20,27 @@
// Double buffering helper.
// ----------------------------------------------------------------------------
// 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.
wxBufferedDC() : m_dc( 0 )
wxBufferedDC() : m_dc( 0 ), m_style(0)
{
}
// Construct a wxBufferedDC using a user supplied buffer.
wxBufferedDC(wxDC *dc, const wxBitmap &buffer)
wxBufferedDC(wxDC *dc, const wxBitmap &buffer, int style = wxBUFFER_CLIENT_AREA)
: m_dc( dc ),
m_buffer( buffer )
m_buffer( buffer ),
m_style(style)
{
UseBuffer();
}
@@ -39,9 +48,11 @@ public:
// 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)
wxBufferedDC(wxDC *dc, const wxSize &area, int style = wxBUFFER_CLIENT_AREA)
: m_dc( dc ),
m_buffer( area.GetWidth(), area.GetHeight() )
m_buffer( area.GetWidth(), area.GetHeight() ),
m_style(style)
{
UseBuffer();
}
@@ -56,18 +67,19 @@ public:
// 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 &buffer)
void Init(wxDC *dc, const wxBitmap &buffer, 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)
void Init(wxDC *dc, const wxSize &area, int style = wxBUFFER_CLIENT_AREA)
{
Init(dc, wxBitmap(area.GetWidth(), area.GetHeight()));
Init(dc, wxBitmap(area.GetWidth(), area.GetHeight()), style);
}
// Blits the buffer to the dc, and detaches the dc from the buffer (so it
@@ -81,8 +93,10 @@ public:
wxASSERT_MSG( m_dc != 0,
_T("No underlying DC associated with wxBufferedDC (anymore)") );
wxCoord x, y;
GetDeviceOrigin(& x, & y);
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,
@@ -90,6 +104,10 @@ public:
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()
@@ -109,6 +127,9 @@ private:
// the buffer (selected in this DC)
wxBitmap m_buffer;
// the buffering style
int m_style;
DECLARE_NO_COPY_CLASS(wxBufferedDC)
};
@@ -122,14 +143,29 @@ private:
class wxBufferedPaintDC : public wxBufferedDC
{
public:
// If no bitmap is supplied by the user, a temporary one wil; be created.
wxBufferedPaintDC(wxWindow *window, const wxBitmap& buffer = wxNullBitmap)
// 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)
{
// 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);
Init(&m_paintdc, buffer, style);
else
Init(&m_paintdc, window->GetClientSize());
Init(&m_paintdc, window->GetClientSize(), style);
}
// 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)
{
// 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.