Metis_xctg/Measurement/HistoryMementos/LayerPropertyHistoryMemento.cs

namespace PaintDotNet.Measurement.HistoryMementos
{
    public class LayerPropertyHistoryMemento
        : HistoryMemento
    {
        private object properties;
        private IDocumentWorkspace historyWorkspace;
        private int layerIndex;

        protected override HistoryMemento OnUndo()
        {
            HistoryMemento ha = new LayerPropertyHistoryMemento(Name, Image, this.historyWorkspace, this.layerIndex);
            Layer layer = (Layer)this.historyWorkspace.GetDocument().Layers[layerIndex];
            layer.LoadProperties(properties, true);
            layer.PerformPropertyChanged();
            return ha;
        }

        public LayerPropertyHistoryMemento(string name, ImageResource image, IDocumentWorkspace historyWorkspace, int layerIndex)
            : base(name, image)
        {
            this.historyWorkspace = historyWorkspace;
            this.layerIndex = layerIndex;
            this.properties = ((Layer)this.historyWorkspace.GetDocument().Layers[layerIndex]).SaveProperties();
        }
    }
}