void RefreshWindows()
{
if (_thumbHandle != IntPtr.Zero)
{
DWMApi.DwmUnregisterThumbnail(_thumbHandle);
}
AvailableWindows.Clear();
User32.EnumWindows((hwnd, e) =>
{
if (_targetHandle != hwnd && (User32.GetWindowLongA(hwnd, User32.GWL_STYLE) & User32.TARGETWINDOW) == User32.TARGETWINDOW)
{
var sb = new StringBuilder(100);
User32.GetWindowText(hwnd, sb, sb.Capacity);
var text = sb.ToString();
if (!string.IsNullOrWhiteSpace(text))
{
AvailableWindows.Add(new KeyValuePair <string, IntPtr>(text, hwnd));
}
}
return(true);
}, 0);
if (AvailableWindows.Count > 0)
{
SelectedWindow = AvailableWindows[0].Value;
}
}
public void Update()
{
if (_thumbHandle == IntPtr.Zero)
{
return;
}
DWMApi.DwmQueryThumbnailSourceSize(_thumbHandle, out PSIZE size);
var props = new DWM_THUMBNAIL_PROPERTIES
{
fVisible = true,
dwFlags = DWMApi.DWM_TNP_VISIBLE | DWMApi.DWM_TNP_RECTDESTINATION | DWMApi.DWM_TNP_OPACITY,
opacity = 255,
rcDestination = _targetRect
};
if (size.x < _targetRect.Width)
{
props.rcDestination.Right = props.rcDestination.Left + size.x;
}
if (size.y < _targetRect.Height)
{
props.rcDestination.Bottom = props.rcDestination.Top + size.y;
}
DWMApi.DwmUpdateThumbnailProperties(_thumbHandle, ref props);
}
