/// <summary>
/// Disable mouse input transparency for the given window.
/// </summary>
/// <remarks>
/// Returns true if input transparency is already disabled or if window isn't layered.
/// </remarks>
/// <exception cref="ArgumentNullException">
/// If input window is null.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// If input window handle is equal to IntPtr.Zero.
/// </exception>
/// <SecurityNote>
/// This method isn't security critical, because work with window handle going on internally.
/// </SecurityNote>
public static bool TryDisableInputTransparency(Window window)
{
if (window is null)
{
throw new ArgumentNullException(nameof(window));
}
IntPtr handle = InternalWindowsHelper.GetWindowHandle(window);
if (handle == IntPtr.Zero)
{
throw new ArgumentException(InputWindowHasInvalidHandle);
}
WindowStylesEx windowStyles = InternalWindowsHelper.GetWindowsExtendedStyle(handle);
if (!windowStyles.HasFlag(WindowStylesEx.WS_EX_LAYERED))
{
return(false);
}
if (windowStyles.HasFlag(WindowStylesEx.WS_EX_TRANSPARENT))
{
WindowStylesEx newStyle = windowStyles & ~WindowStylesEx.WS_EX_TRANSPARENT;
return(InternalWindowsHelper.TrySetWindowsExtendedStyle(handle, newStyle));
}
else
{
return(true);
}
}
/// <summary>
/// Checks that input window is transparency for the mouse input.
/// </summary>
/// <exception cref="ArgumentNullException">
/// If input window is null.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// If input window handle is equal to IntPtr.Zero.
/// </exception>
/// <SecurityNote>
/// This method isn't security critical, because work with window handle going on internally.
/// </SecurityNote>
public static bool HasInputTransparency(Window window)
{
if (window is null)
{
throw new ArgumentNullException(nameof(window));
}
IntPtr handle = InternalWindowsHelper.GetWindowHandle(window);
if (handle == IntPtr.Zero)
{
throw new ArgumentException(InputWindowHasInvalidHandle);
}
return(InternalWindowsHelper.IsContainExtendedStyle(handle, WindowStylesEx.WS_EX_TRANSPARENT));
}
