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Fixed the big drawing issues for the Windows popover.

This commit is contained in:
Pietro Gagliardi 2014-10-09 19:00:58 -04:00
parent e7fb5c9488
commit 8ce9f4d7ff
1 changed files with 45 additions and 26 deletions
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71
windowspopover/main.c
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@ -33,51 +33,69 @@ HWND popover;
#define ARROWHEIGHT 8
#define ARROWWIDTH 8 /* should be the same for smooth lines */
HRGN makePopoverRegion(HDC dc, LONG width, LONG height)
{
POINT pt;
BeginPath(dc);
pt.x = 0;
pt.y = ARROWHEIGHT;
MoveToEx(dc, pt.x, pt.y, NULL);
pt.y += height - ARROWHEIGHT;
LineTo(dc, pt.x, pt.y);
pt.x += width;
LineTo(dc, pt.x, pt.y);
pt.y -= height - ARROWHEIGHT;
LineTo(dc, pt.x, pt.y);
pt.x -= (width / 2) - ARROWWIDTH;
LineTo(dc, pt.x, pt.y);
pt.x -= ARROWWIDTH;
pt.y -= ARROWHEIGHT;
LineTo(dc, pt.x, pt.y);
pt.x -= ARROWWIDTH;
pt.y += ARROWHEIGHT;
LineTo(dc, pt.x, pt.y);
pt.x = 0;
LineTo(dc, pt.x, pt.y);
EndPath(dc);
return PathToRegion(dc);
}
LRESULT CALLBACK popoverproc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT ps;
HDC dc;
HRGN region;
POINT pt;
RECT r;
LONG width;
LONG height;
WINDOWPOS *wp;
switch (uMsg) {
case WM_NCPAINT:
GetWindowRect(hwnd, &r);
width = r.right - r.left;
height = r.bottom - r.top;
dc = GetDCEx(hwnd, (HRGN) wParam, DCX_WINDOW | DCX_INTERSECTRGN);
dc = GetWindowDC(hwnd);
if (dc == NULL) abort();
BeginPath(dc);
r.left = 0; r.top = 0; // everything's in device coordinates
pt.x = r.left;
pt.y = r.top + ARROWHEIGHT;
if (MoveToEx(dc, pt.x, pt.y, NULL) == 0) abort();
pt.y += height - ARROWHEIGHT;
if (LineTo(dc, pt.x, pt.y) == 0) abort();
pt.x += width;
LineTo(dc, pt.x, pt.y);
pt.y -= height - ARROWHEIGHT;
LineTo(dc, pt.x, pt.y);
pt.x -= (width / 2) - ARROWWIDTH;
LineTo(dc, pt.x, pt.y);
pt.x -= ARROWWIDTH;
pt.y -= ARROWHEIGHT;
LineTo(dc, pt.x, pt.y);
pt.x -= ARROWWIDTH;
pt.y += ARROWHEIGHT;
LineTo(dc, pt.x, pt.y);
pt.x = 0;
LineTo(dc, pt.x, pt.y);
EndPath(dc);
SetDCBrushColor(dc, RGB(255, 0, 0));
region = PathToRegion(dc);
region = makePopoverRegion(dc, width, height);
FrameRgn(dc, region, GetStockObject(DC_BRUSH), 1, 1);
SetWindowRgn(hwnd, region, TRUE);
DeleteObject(region);
ReleaseDC(hwnd, dc);
return 0;
case WM_WINDOWPOSCHANGED:
// this must be here; if it's in WM_NCPAINT weird things happen (see http://stackoverflow.com/questions/26288303/why-is-my-client-rectangle-drawing-behaving-bizarrely-pictures-provided-if-i-t)
wp = (WINDOWPOS *) lParam;
if ((wp->flags & SWP_NOSIZE) == 0) {
dc = GetWindowDC(hwnd);
if (dc == NULL) abort();
region = makePopoverRegion(dc, wp->cx, wp->cy);
SetWindowRgn(hwnd, region, TRUE);
// don't delete the region; the window manager owns it now
ReleaseDC(hwnd, dc);
}
break; // defer to DefWindowProc()
case WM_NCCALCSIZE:
{
RECT *r = (RECT *) lParam;
@ -99,6 +117,7 @@ LRESULT CALLBACK popoverproc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
dc = BeginPaint(hwnd, &ps);
GetClientRect(hwnd, &r);
FillRect(dc, &r, GetSysColorBrush(COLOR_ACTIVECAPTION));
FrameRect(dc, &r, GetStockPen(WHITE_PEN));
EndPaint(hwnd, &ps);
return 0;
}