protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (!HandleMouseOnGlass || !_glassEnabled)
{
return;
}
// Respond to hit test messages with Caption if mouse on glass:
// this automatically enables form dragging on glass
if (m.Msg == (int)WindowMessage.WM_NCHITTEST &&
m.Result.ToInt32() == (int)HitTest.HTCLIENT)
{
// Check if mouse pointer is on glass part of form
if (_glassFull)
{
m.Result = (IntPtr)HitTest.HTCAPTION;
}
else
{
uint lparam = (uint)m.LParam.ToInt32();
ushort x = IntHelpers.LowWord(lparam);
ushort y = IntHelpers.HighWord(lparam);
var clientPoint = PointToClient(new System.Drawing.Point(x, y));
if (_glassMargins.IsOutside(clientPoint, ClientSize))
{
m.Result = (IntPtr)HitTest.HTCAPTION;
}
}
}
}
