The solution:
- Do not use WS_EX_COMPOSITED.
- Instead of using GetDC(hWnd) use BeginPaint(hwnd, &ps) and EndPaint(hwnd, &ps)
Question
i have implemented double buffering in my application, using the code below. After wards, i found that my child windows (ie, buttoms), was not animating like normal, so i added WS_EX_COMPOSITED to my parent window, and the child windows are now animating correctly. However, after adding WS_EX_COMPOSITED, my Menu that is created from my resource, is black, and not displaying properly.
So, how to add double buffering to my top Menu?
MainWinHwnd = CreateWindowEx(WS_EX_COMPOSITED, MainWinClassName, MainWinTitle,
WS_VISIBLE|WS_BORDER|WS_SYSMENU|WS_MINIMIZEBOX|WS_MAXIMIZEBOX|WS_SIZEBOX|WS_CLIPCHILDREN,
NULL, NULL, 609, 440, NULL, NULL, hInstance, NULL);
if (!MainWinHwnd) return FALSE;
case WM_PAINT:
{
RECT WinRt;
RECT TxtRt;
HFONT TxtFont = NULL;
SIZE TxtSize;
HDC WinDC = GetDC(hWnd);
GetClientRect(hWnd, &WinRt);
HDC WinBuffer = CreateCompatibleDC(WinDC);
HBITMAP BitBuffer = CreateCompatibleBitmap(WinDC, WinRt.right, WinRt.bottom);
SelectObject(WinBuffer, BitBuffer);
FillRect(WinBuffer, &WinRt, (HBRUSH) (COLOR_BTNFACE + 1));
SetBkColor(WinBuffer, GetSysColor((COLOR_BTNFACE)));
DrawThemeBackground(ButtonThemeData, WinBuffer, BP_GROUPBOX, GBS_NORMAL, &GroupOptionBox, NULL);
DrawThemeBackground(DragDropThemeData, WinBuffer, RP_GRIPPER, 0, &DragDropItem, NULL);
for (DWORD I = 0; I < sizeof(MainWinLabels) / sizeof(CustomLabel); I++)
{
if (MainWinLabels[I].Font == NULL)
{
TxtFont = CreateFontA(MainWinLabels[I].cFontHeight, NULL, NULL, NULL, FW_DONTCARE,
MainWinLabels[I].cFontItalic, MainWinLabels[I].cFontUnderline,
MainWinLabels[I].cFontStrikeOut, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS,
MainWinLabels[I].cFontQuality, DEFAULT_PITCH, MainWinLabels[I].cFontFaceName);
if (TxtFont == NULL) continue;
SelectObject(WinBuffer, TxtFont);
}
else SelectObject(WinBuffer, *MainWinLabels[I].Font);
SetTextColor(WinBuffer, MainWinLabels[I].Color);
TxtRt.left = MainWinLabels[I].X;
TxtRt.top = MainWinLabels[I].Y;
DrawTextA(WinBuffer, MainWinLabels[I].Text, strlen(MainWinLabels[I].Text), &TxtRt,
DT_LEFT|DT_SINGLELINE|DT_NOCLIP);
GetTextExtentPoint32A(WinBuffer, MainWinLabels[I].Text, strlen(MainWinLabels[I].Text), &TxtSize);
MainWinLabels[I].Width = TxtSize.cx;
MainWinLabels[I].Height = TxtSize.cy;
if (TxtFont != NULL) DeleteObject(TxtFont);
}
BitBlt(WinDC, 0, 0, WinRt.right, WinRt.bottom, WinBuffer, 0, 0, SRCCOPY);
ReleaseDC(hWnd, WinDC);
DeleteObject(BitBuffer);
DeleteDC(WinBuffer);
break;
}
Solution
The solution: