LRESULT Label::WindowProcProxy(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
// Get a 'this' pointer from the window data
Label *label = (Label *) GetWindowLongPtr(hWnd, GWLP_THIS);
if (message == WM_NCCREATE)
{
// WM_NCCREATE is our first chance to get our 'this' pointer, which
// was passed in to CreateWindowEx
label = (Label *) ((LPCREATESTRUCT) lParam)->lpCreateParams;
if (label)
{
// Create is still inside CreateWindowEx, so mWindow hasn't been
// assigned. Assign it here so we can use it in the WM_[NC]CREATE
// handler.
label->mWindow = hWnd;
// Put a 'this' pointer in the window data so we can get it later
SetWindowLongPtr(hWnd, GWLP_THIS, (LONG_PTR) label);
}
}
if (label)
{
// Relay the message
return label->WindowProc(message, wParam, lParam);
}
// Any messages sent before WM_NCCREATE wind up here
return DefWindowProc(hWnd, message, wParam, lParam);
}
