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Split out the parent drawing in windows/container.c into its own function. This is necessary to allow for clipping.

This commit is contained in:
Pietro Gagliardi 2015-05-06 11:10:28 -04:00
parent 6b9990a58c
commit 74fc1aea45
1 changed files with 38 additions and 23 deletions
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61
windows/container.c
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@ -29,40 +29,55 @@ static HWND realParent(HWND hwnd)
return parent;
}
struct parentDraw {
HDC cdc;
HBITMAP bitmap;
HBITMAP prevbitmap;
};
static void parentDraw(HDC dc, HWND parent, struct parentDraw *pd)
{
RECT r;
if (GetClientRect(parent, &r) == 0)
logLastError("error getting parent's client rect in parentDraw()");
pd->cdc = CreateCompatibleDC(dc);
if (pd->cdc == NULL)
logLastError("error creating compatible DC in parentDraw()");
pd->bitmap = CreateCompatibleBitmap(dc, r.right - r.left, r.bottom - r.top);
if (pd->bitmap == NULL)
logLastError("error creating compatible bitmap in parentDraw()");
pd->prevbitmap = SelectObject(pd->cdc, pd->bitmap);
if (pd->prevbitmap == NULL)
logLastError("error selecting bitmap into compatible DC in parentDraw()");
SendMessageW(parent, WM_PRINTCLIENT, (WPARAM) (pd->cdc), PRF_CLIENT);
}
static void endParentDraw(struct parentDraw *pd)
{
if (SelectObject(pd->cdc, pd->prevbitmap) != pd->bitmap)
logLastError("error selecting previous bitmap back into compatible DC in endParentDraw()");
if (DeleteObject(pd->bitmap) == 0)
logLastError("error deleting compatible bitmap in endParentDraw()");
if (DeleteDC(pd->cdc) == 0)
logLastError("error deleting compatible DC in endParentDraw()");
}
// see http://www.codeproject.com/Articles/5978/Correctly-drawn-themed-dialogs-in-WinXP
static HBRUSH getControlBackgroundBrush(HWND hwnd, HDC dc)
{
HWND parent;
RECT parentRect, hwndScreenRect;
HDC cdc;
HBITMAP bitmap, prevbitmap;
struct parentDraw pd;
HBRUSH brush;
parent = realParent(hwnd);
if (GetClientRect(parent, &parentRect) == 0)
logLastError("error getting parent's client rect in getControlBackgroundBrush()");
cdc = CreateCompatibleDC(dc);
if (cdc == NULL)
logLastError("error creating compatible DC in getControlBackgroundBrush()");
bitmap = CreateCompatibleBitmap(dc, parentRect.right - parentRect.left, parentRect.bottom - parentRect.top);
if (bitmap == NULL)
logLastError("error creating compatible bitmap in getControlBackgroundBrush()");
prevbitmap = SelectObject(cdc, bitmap);
if (prevbitmap == NULL)
logLastError("error selecting bitmap into compatible DC in getControlBackgroundBrush()");
SendMessageW(parent, WM_PRINTCLIENT, (WPARAM) cdc, PRF_CLIENT);
// create it now, just to be safe
brush = CreatePatternBrush(bitmap);
parentDraw(dc, parent, &pd);
brush = CreatePatternBrush(pd.bitmap);
if (brush == NULL)
logLastError("error creating pattern brush in getControlBackgroundBrush()");
if (SelectObject(cdc, prevbitmap) != bitmap)
logLastError("error selecting previous bitmap back into compatible DC in getControlBackgroundBrush()");
if (DeleteObject(bitmap) == 0)
logLastError("error deleting compatible bitmap in getControlBackgroundBrush()");
if (DeleteDC(cdc) == 0)
logLastError("error deleting compatible DC in getControlBackgroundBrush()");
endParentDraw(&pd);
// now figure out where the control is relative to the parent so we can align the brush properly
if (GetWindowRect(hwnd, &hwndScreenRect) == 0)