internal CopyObserver(Window owner, ClipboardChangedHandler callback)
{
this._callback = callback;
this._handle = new WindowInteropHelper(owner).Handle;
this._hwndSource = HwndSource.FromHwnd(this._handle);
this._hwndSource.AddHook(MainWindowProc);
}
/// <summary>
/// Release managed source. Called when `Dispose(bool)` is called.
/// </summary>
private void ReleaseManagedSource()
{
this._callback = null;
}
