private Layer GetActiveBackgroundLayer(MaybeTask <IImageProvider> backgroundImage, Size backgroundImageSize)
{
var backgroundLayer = this[0];
// Replace BG layer?
if (!backgroundImage.IsEmpty)
{
if (backgroundLayer != EmptyLayer)
{
throw new ArgumentException("LayerList was constructed with a background image, do not pass one into ToImageProvider.", "backgroundImage");
}
backgroundLayer = new Layer(LayerStyle.Normal(), backgroundImage, backgroundImageSize);
}
return(backgroundLayer);
}
/// <summary>
/// Creates a LayerList with a specified background image.
/// </summary>
/// <param name="backgroundImage">The image to use for the background layer.</param>
/// <param name="backgroundImageSize">Optionally, the size of the background image. If omitted, the natural size of the source will be used, but the size will not available in the LayerLinkingContext for lazy resolvers.</param>
/// <param name="layers">A list of layers to add following the background layer.</param>
public LayerList(IImageProvider backgroundImage, Size backgroundImageSize, params Layer[] layers)
{
Add(new Layer(LayerStyle.Normal(), new MaybeTask <IImageProvider>(backgroundImage), backgroundImageSize));
AddRange(layers);
}