129 lines
2.6 KiB
C
129 lines
2.6 KiB
C
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#define TestWF(hwnd, f) (GetWindowLong(hwnd, GWL_STYLE) & (f))
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#define TestWX(hwnd, f) (GetWindowLong(hwnd, GWL_EX_STYLE) & (f))
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BOOL DVAIsClipped(HDC hdc, RECT& rc)
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{
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RECT rcClip;
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if (GetClipBox(hdc, &rcClip) != SIMPLEREGION)
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return TRUE;
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if (rc.left < rcClip.left ||
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rc.top < rcClip.top ||
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rc.right > rcClip.right ||
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rc.bottom > rcClip.bottom)
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return TRUE;
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return FALSE;
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}
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int DVAGetClipList(HWND hwnd, LPRECT prc, LPRECT RectList, int RectCount)
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{
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RECT rc;
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HWND hwndP;
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HWND hwndT;
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if (RectCount == 0 || !IsVisible(hwnd))
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return 0;
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//
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// get the client area of the window
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//
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GetClientRect(hwnd, RectList);
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if (prc)
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IntersectRect(RectList, RectList, prc);
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ClientToScreen(hwnd, (LPPOINT)RectList);
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ClientToScreen(hwnd, (LPPOINT)RectList + 1);
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RectCount = 1;
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RectList[1] = RectList[0];
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//
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// walk all children of hwnd and remove them if needed
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//
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if (TestWF(hwnd, WS_CLIPCHILDREN))
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{
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RectCount = ExcludeWindowRects(RectList, RectCount,
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GetWindow(hwnd, GW_CHILD), NULL);
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if (RectCount == 0)
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return 0;
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}
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//
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// walk all the siblings of hwnd and exclude them from the list.
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//
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for (; (hwndP = GetWindow(hwnd, GW_PARENT)) != NULL; hwnd = hwndP)
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{
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GetWindowRect(hwndP, &rc);
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RectCount = IntersectRectList(RectList, RectCount, &rc;
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if (RectCount == 0)
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return 0;
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if (TestWF(hwnd, WS_CLIPSIBLINGS))
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{
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RectCount = ExcludeWindowRects(RectList, RectCount,
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GetWindow(hwndP, GW_CHILD), hwnd);
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if (RectCount == 0)
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return 0;
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}
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}
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return RectCount;
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}
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int ExcludeWindowRects(LPRECT RectList, int RectCount, HWND hwndA, HWND hwndB)
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{
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RECT rc;
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for (hwnd = hwndA; hwnd != NULL && hwnd != hwndB; hwnd = GetWindow(hwnd, GW_HWNDNEXT))
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{
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if (!IsWindowVisible(hwnd))
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continue;
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//
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// Don't subtract off transparent windows...
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//
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if (TestWX(hwnd, WS_EX_TRANSPARENT))
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continue;
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GetWindowRect(hwnd, &rc);
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RectCount = ExcludeRectList(RectList, RectCount, &rc);
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if (RectCount == 0)
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return 0;
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}
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return RectCount;
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}
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int ExcludeRectList(LPRECT RectList, int RectCount, LPRECT prc)
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{
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int i;
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int n;
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RECT rc;
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if (RectCount == 0)
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return 0;
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SubtractRect(RectList, prc);
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for (i=1; i <= RectCount; i++)
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{
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if (!IntersectRect(&rc, &RectList[i], prc))
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continue;
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//
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//
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//
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}
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}
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