/// <summary>Selects a portion of a window's client area to display as that window's thumbnail in the taskbar.</summary>
/// <param name="parent">The window represented in the taskbar.</param>
/// <param name="windowClipRect">
/// A <see cref="Rectangle"/> that specifies a selection within the window's client area, relative to the upper-left corner of that client area. To clear
/// a clip that is already in place and return to the default display of the thumbnail, set this parameter to NULL.
/// </param>
public static void SetThumbnailClip(IWin32Window parent, Rectangle windowClipRect)
{
Validate7OrLater();
if (parent == null)
{
throw new ArgumentNullException(nameof(parent));
}
RECT cr = windowClipRect;
taskbar4?.SetThumbnailClip(parent.Handle, ref cr);
}
public static void SetThumbnailClip(IntPtr hwnd, NativeRect?rect)
{
if (IsInitialized)
{
if (rect.HasValue)
{
IntPtr rectPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(rect));
try
{
Marshal.StructureToPtr(rect, rectPtr, true);
taskbar.SetThumbnailClip(hwnd, rectPtr);
}
finally
{
Marshal.FreeCoTaskMem(rectPtr);
}
}
else
{
taskbar.SetThumbnailClip(hwnd, IntPtr.Zero);
}
}
}