/// <summary>
/// Constructor to construct a DeviceContext object from an window handle.
/// </summary>
private DeviceContext(IntPtr hWnd)
{
_hWnd = hWnd;
_dcType = DeviceContextType.Display;
DeviceContexts.AddDeviceContext(this);
// the hDc will be created on demand.
#if TRACK_HDC
Debug.WriteLine(DbgUtil.StackTraceToStr(string.Format("DeviceContext( hWnd=0x{0:x8} )", unchecked ((int)hWnd))));
#endif
}
/// <summary>
/// Constructor to construct a DeviceContext object from an existing Win32 device context handle.
/// </summary>
private DeviceContext(IntPtr hDC, DeviceContextType dcType)
{
_hDC = hDC;
_dcType = dcType;
CacheInitialState();
DeviceContexts.AddDeviceContext(this);
if (dcType == DeviceContextType.Display)
{
_hWnd = IntUnsafeNativeMethods.WindowFromDC(new HandleRef(this, _hDC));
}
#if TRACK_HDC
Debug.WriteLine(DbgUtil.StackTraceToStr(string.Format("DeviceContext( hDC=0x{0:X8}, Type={1} )", unchecked ((int)hDC), dcType)));
#endif
}
/// <summary>
/// Constructor to construct a DeviceContext object from an existing Win32 device context handle.
/// </summary>
private DeviceContext(IntPtr hDC, DeviceContextType dcType)
{
_hDC = hDC;
_dcType = dcType;
CacheInitialState();
DeviceContexts.AddDeviceContext(this);
if (dcType == DeviceContextType.Display)
{
_hWnd = Interop.User32.WindowFromDC(new HandleRef(this, _hDC));
}
#if TRACK_HDC
Debug.WriteLine(DbgUtil.StackTraceToStr($"DeviceContext(hDC=0x{(int)hDC:X8}, Type={dcType})"));
#endif
}