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Figured out something workable for control backgrounds on Windows!

This commit is contained in:
Pietro Gagliardi 2015-05-04 23:06:16 -04:00
parent 4e56f2d2b5
commit 2968d48d9e
1 changed files with 66 additions and 6 deletions
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72
windows/container.c
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@ -9,8 +9,62 @@ struct container {
HWND hwnd;
uiContainer *parent;
int hidden;
HBRUSH brush;
};
// see http://www.codeproject.com/Articles/5978/Correctly-drawn-themed-dialogs-in-WinXP
static HBRUSH getControlBackgroundBrush(HWND hwnd, HDC dc)
{
HWND parent;
RECT window;
RECT r;
int class;
HDC cdc;
HBITMAP bitmap, prevbitmap;
HBRUSH brush;
DWORD le;
parent = hwnd;
for (;;) {
parent = GetAncestor(parent, GA_PARENT);
// skip groupboxes; they're (supposed to be) transparent
// skip uiContainers; they don't draw anything
class = windowClassOf(parent, L"button", containerClass, NULL);
if (class != 0 && class != 1)
break;
}
if (GetWindowRect(hwnd, &window) == 0)
logLastError("error getting control's window rect in paintControlBackground()");
// the above is a window rect in screen coordinates; convert to parent coordinates
r = window;
SetLastError(0);
if (MapWindowRect(NULL, parent, &r) == 0) {
le = GetLastError();
SetLastError(le); // just to be safe
if (le != 0)
logLastError("error getting client origin of control in paintControlBackground()");
}
// TODO check errors
cdc = CreateCompatibleDC(dc);
bitmap = CreateCompatibleBitmap(dc, r.right - r.left, r.bottom - r.top);
prevbitmap = SelectObject(cdc, bitmap);
SendMessageW(parent, WM_PRINTCLIENT, (WPARAM) cdc, PRF_CLIENT);
// TODO check errors
SelectObject(cdc, prevbitmap);
DeleteDC(cdc);
brush = CreatePatternBrush(bitmap);
DeleteObject(bitmap);
SetBrushOrgEx(dc, -r.left, -r.top, NULL);
return brush;
}
// from https://msdn.microsoft.com/en-us/library/windows/desktop/dn742486.aspx#sizingandspacing and https://msdn.microsoft.com/en-us/library/windows/desktop/bb226818%28v=vs.85%29.aspx
// this X value is really only for buttons but I don't see a better one :/
#define winXPadding 4
@ -90,19 +144,25 @@ static LRESULT CALLBACK containerWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LP
if (control != NULL && IsChild(initialParent, control) == 0)
return SendMessageW(control, msgNOTIFY, wParam, lParam);
break;
/* case WM_CTLCOLORSTATIC:
// these are only run if c is not NULL
case WM_CTLCOLORSTATIC:
case WM_CTLCOLORBTN:
if (cc == NULL)
break;
c = (struct container *) (uiControl(cc)->Internal);
if (c->brush != NULL)
if (DeleteObject(c->brush) == 0)
logLastError("error deleting old background brush in containerWndProc()");
/*TODO // read-only TextFields and Textboxes are exempt
// this is because read-only edit controls count under WM_CTLCOLORSTATIC
if (windowClassOf((HWND) lParam, L"edit", NULL) == 0)
if (textfieldReadOnly((HWND) lParam))
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
*//* if (SetBkMode((HDC) wParam, TRANSPARENT) == 0)
*/ if (SetBkMode((HDC) wParam, TRANSPARENT) == 0)
logLastError("error setting transparent background mode to controls in parentWndProc()");
// paintControlBackground((HWND) lParam, (HDC) wParam);
return (LRESULT) hollowBrush;
*/
// these are only run if c is not NULL
c->brush = getControlBackgroundBrush((HWND) lParam, (HDC) wParam);
return (LRESULT) (c->brush);
case WM_WINDOWPOSCHANGED:
if ((wp->flags & SWP_NOSIZE) != 0)
break;