GDI+ and Rubberband/Selection Rectangle

[mmscg]

I cannot find how to draw a simple selection rectangle (rubberband) using
GDI+.

This should be a simple thing, but I'm beginning to wonder if it is even possible.

[ovidiucucu]

It's so simple then is not needed GDI+ for doing it (although you are using GDI+ for other stuff).
Here is an example using "classic" GDI functions:

void _DrawRubberBand(HWND hWnd, RECT& rc)
{
   HDC hDC = ::GetDC(hWnd);
   HBRUSH hBrush = (HBRUSH)::GetStockObject(NULL_BRUSH);
   HBRUSH hOldBrush = (HBRUSH)::SelectObject(hDC, hBrush);
   ::SetROP2(hDC, R2_NOT);

   ::Rectangle(hDC, rc.left, rc.top, rc.right, rc.bottom);

   ::SelectObject(hDC, hOldBrush);
   ::ReleaseDC(hWnd, hDC);
}

And here is another one

void _DrawRubberBand(HWND hWnd, int left, int top, int right, int bottom)
{
   HDC hDC = ::GetDC(hWnd);
   ::SetROP2(hDC, R2_NOT);
   ::MoveToEx(hDC, left, top, NULL);
   POINT pt[4] = {{right, top}, {right, bottom}, {left, bottom}, {left, top}};
   ::PolylineTo(hDC, pt, 4);
   ::ReleaseDC(hWnd, hDC);
}

Of course, you have to further handle WM_LBUTTONDOWN, WM_MOUSEMOVE and WM_LBUTTONUP messages, in order to draw a selection rectangle on user action.

[mmscg]

I for some reason didn't think you could mix GDI and GDI+

Curiosity then, this cannot be done using GDI+ alone?

[ovidiucucu]

Like any other library, GDI+ could not implement everything our muscles want.
If something is missing in there, then one ultimate solution is to use native Windows API.