1
///////////////////////////////////////////////////////////////////////////////
2
// CDoubleBufferImpl - Provides double-buffer painting support to any window
3
4template <class T>
5class CDoubleBufferImpl
6{
7
public:
8// Overrideables
9
void DoPaint(CDCHandle /*dc*/)
10 {
11 // must be implemented in a derived class
12 ATLASSERT(FALSE);
13
}
14
15// Message map and handlers
16 BEGIN_MSG_MAP(CDoubleBufferImpl)
17 MESSAGE_HANDLER(WM_ERASEBKGND, OnEraseBackground)
18 MESSAGE_HANDLER(WM_PAINT, OnPaint)
19#ifndef _WIN32_WCE
20 MESSAGE_HANDLER(WM_PRINTCLIENT, OnPaint)
21#endif // !_WIN32_WCE
22 END_MSG_MAP()
23
24 LRESULT OnEraseBackground(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
25 {
26 return 1; // no background painting needed
27 }
28
29 LRESULT OnPaint(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& /*bHandled*/)
30 {
31 T* pT = static_cast<T*>(this);
32 ATLASSERT(::IsWindow(pT->m_hWnd));
33
34 if(wParam != NULL)
35 {
36 RECT rect = { 0 };
37 pT->GetClientRect(&rect);
38 CMemoryDC dcMem((HDC)wParam, rect);
39 pT->DoPaint(dcMem.m_hDC);
40 }
41 else
42 {
43 CPaintDC dc(pT->m_hWnd);
44 CMemoryDC dcMem(dc.m_hDC, dc.m_ps.rcPaint);
45 pT->DoPaint(dcMem.m_hDC);
46 }
47
48 return 0;
49 }
50
};
///////////////////////////////////////////////////////////////////////////////
2
// CDoubleBufferImpl - Provides double-buffer painting support to any window3
4
template <class T>5
class CDoubleBufferImpl6
{
7
public:8
// Overrideables9
void DoPaint(CDCHandle /*dc*/)
10
{11
// must be implemented in a derived class12
ATLASSERT(FALSE);13
}14
15
// Message map and handlers16
BEGIN_MSG_MAP(CDoubleBufferImpl)17
MESSAGE_HANDLER(WM_ERASEBKGND, OnEraseBackground)18
MESSAGE_HANDLER(WM_PAINT, OnPaint)19
#ifndef _WIN32_WCE20
MESSAGE_HANDLER(WM_PRINTCLIENT, OnPaint)21
#endif // !_WIN32_WCE22
END_MSG_MAP()23
24
LRESULT OnEraseBackground(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)25
{26
return 1; // no background painting needed27
}28
29
LRESULT OnPaint(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& /*bHandled*/)30
{31
T* pT = static_cast<T*>(this);32
ATLASSERT(::IsWindow(pT->m_hWnd));33
34
if(wParam != NULL)35
{36
RECT rect = { 0 };37
pT->GetClientRect(&rect);38
CMemoryDC dcMem((HDC)wParam, rect);39
pT->DoPaint(dcMem.m_hDC);40
}41
else42
{43
CPaintDC dc(pT->m_hWnd);44
CMemoryDC dcMem(dc.m_hDC, dc.m_ps.rcPaint);45
pT->DoPaint(dcMem.m_hDC);46
}47
48
return 0;49
}50
};