protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
if (!(PresentationSource.FromVisual(this) is HwndSource source))
{
throw new InvalidOperationException("HwndSource is missing.");
}
this._source = source;
this._source.AddHook(this.WndProc);
this._handle = source.Handle;
this.SystemDpi = DpiHelper.GetDpiForSystem();
this.CurrentDpi = this.SystemDpi;
this.UpdateDpiResources();
var wndStyle = User32.GetWindowLong(this._handle);
var wexStyle = User32.GetWindowLongEx(this._handle);
User32.SetWindowLong(this._handle, wndStyle & ~WindowStyles.WS_SYSMENU);
User32.SetWindowLongEx(this._handle, wexStyle | WindowExStyles.WS_EX_TOOLWINDOW);
if (this.Owner is WindowWrapper wrapper)
{
base.Owner = wrapper.Window;
}
this._sourceInitialized = true;
}