private static void OnIsEnabledPropertyChanged(DependencyObject source, DependencyPropertyChangedEventArgs args)
{
MenuIconImage menuIconImage = source as MenuIconImage;
if (menuIconImage != null)
{
bool isEnabled = Convert.ToBoolean(args.NewValue);
if (!isEnabled)
{
// Get the source bitmap
BitmapImage bitmapImage = new BitmapImage(new Uri(menuIconImage.Source.ToString()));
// Convert it to grey
menuIconImage.Source = new FormatConvertedBitmap(bitmapImage, PixelFormats.Gray32Float, null, 0);
// Create opacity mask for greyscale image as FormatConvertedBitmap does not keep transparency info
menuIconImage.OpacityMask = new ImageBrush(bitmapImage);
}
else
{
// Set the Source property to the original value
menuIconImage.Source = ((FormatConvertedBitmap)menuIconImage.Source).Source;
// Reset the opacity mask
menuIconImage.OpacityMask = null;
}
}
}
/// <summary>
/// Initialises a new instance of the MenuIconExtension class.
/// </summary>
/// <param name="sourceUri">The source URI of the image to display. Use the absolute path in the project, e. g. "/Images/myicon.png".</param>
public MenuIconExtension(string sourceUri)
{
img = new MenuIconImage();
BitmapImage bmp = new BitmapImage();
bmp.BeginInit();
bmp.UriSource = new Uri("pack://application:,,," + sourceUri, UriKind.Absolute);
bmp.EndInit();
img.Source = bmp;
img.Width = bmp.PixelWidth;
img.Height = bmp.PixelHeight;
}
/// <summary>
/// Initialises a new instance of the MenuIconExtension class.
/// </summary>
/// <param name="sourceUri">The source URI of the image to display. Use the absolute path in the project, e. g. "/Images/myicon.png".</param>
public MenuIconExtension(string sourceUri)
{
img = new MenuIconImage();
BitmapImage bmp = new BitmapImage();
bmp.BeginInit();
bmp.UriSource = new Uri("pack://application:,,," + sourceUri, UriKind.Absolute);
bmp.EndInit();
img.Source = bmp;
img.Width = bmp.PixelWidth;
img.Height = bmp.PixelHeight;
}