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- avoid clock flicker in timedate.cpl

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- TODO: limit repaint area to clock only (to avoid flicker of time adjusting control as well)

svn path=/trunk/; revision=34325
This commit is contained in:
Matthias Kupfer 2008-07-06 12:05:17 +00:00
parent d94dde07f8
commit 114955b298
1 changed files with 30 additions and 6 deletions
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36
reactos/dll/cpl/timedate/clock.c
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@ -141,7 +141,8 @@ ClockWndProc(HWND hwnd,
LPARAM lParam)
{
PCLOCKDATA pClockData;
HDC hdc;
HDC hdc, dcMem;
HBITMAP bmMem, bmOld;
PAINTSTRUCT ps;
pClockData = (PCLOCKDATA)GetWindowLongPtrW(hwnd, GWLP_USERDATA);
@ -168,15 +169,38 @@ ClockWndProc(HWND hwnd,
case WM_TIMER:
GetLocalTime(&pClockData->stCurrent);
InvalidateRect(hwnd, NULL, TRUE);
//InvalidateRect(hwnd, NULL, TRUE);
InvalidateRect(hwnd, NULL, FALSE);
pClockData->stPrevious = pClockData->stCurrent;
break;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
SetIsotropic(hdc, pClockData);
DrawClock(hdc, pClockData);
DrawHands(hdc, &pClockData->stPrevious, TRUE);
/* Use an offscreen dc to avoid flicker */
dcMem = CreateCompatibleDC(hdc);
bmMem = CreateCompatibleBitmap(hdc, ps.rcPaint.right - ps.rcPaint.left, ps.rcPaint.bottom - ps.rcPaint.top);
bmOld = SelectObject(dcMem, bmMem);
SetViewportOrgEx(dcMem, -ps.rcPaint.left, -ps.rcPaint.top, NULL);
FillRect(dcMem, &ps.rcPaint, GetSysColorBrush(COLOR_BTNFACE));
SetIsotropic(dcMem, pClockData);
DrawClock(dcMem, pClockData);
DrawHands(dcMem, &pClockData->stPrevious, TRUE);
/* Blit the changes to the screen */
BitBlt(hdc,
ps.rcPaint.left, ps.rcPaint.top,
ps.rcPaint.right - ps.rcPaint.left, ps.rcPaint.bottom - ps.rcPaint.top,
dcMem,
ps.rcPaint.left, ps.rcPaint.top,
SRCCOPY);
SelectObject(dcMem, bmOld);
DeleteObject(bmMem);
DeleteObject(dcMem);
EndPaint(hwnd, &ps);
break;
@ -202,7 +226,7 @@ ClockWndProc(HWND hwnd,
CopyMemory(&pClockData->stPrevious, (LPSYSTEMTIME)lParam, sizeof(SYSTEMTIME));
/* Redraw the clock */
InvalidateRect(hwnd, NULL, TRUE);
InvalidateRect(hwnd, NULL, FALSE);
break;
default: