PropertyChangedActionItem.cs

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// Copyright (c) 2014 Silicon Studio Corp. (http://siliconstudio.co.jp)
// This file is distributed under GPL v3. See LICENSE.md for details.
using System;
using System.Reflection;

namespace SiliconStudio.ActionStack
{
    public class PropertyChangedActionItem : ActionItem
    {
        private readonly string propertyName;
        private object container;
        private object previousValue;

        public PropertyChangedActionItem(string propertyName, object container, object previousValue)
        {
            if (propertyName == null) throw new ArgumentNullException("propertyName");
            if (container == null) throw new ArgumentNullException("container");
            this.propertyName = propertyName;
            this.container = container;
            this.previousValue = previousValue;
        }

        /// <summary>
        /// Gets the name of the property affected by the change.
        /// </summary>
        public string PropertyName { get { return propertyName; } }

        /// <inheritdoc/>
        protected override void FreezeMembers()
        {
            container = null;
            previousValue = null;
        }

        /// <inheritdoc/>
        protected override void UndoAction()
        {
            PropertyInfo propertyInfo = container.GetType().GetProperty(propertyName, BindingFlags.Public | BindingFlags.Instance);
            object value = previousValue;
            previousValue = propertyInfo.GetValue(container);
            propertyInfo.SetValue(container, value);
        }

        /// <inheritdoc/>
        protected override void RedoAction()
        {
            // Once we have un-done, the previous value is updated so Redo is just Undoing the Undo
            UndoAction();
        }
    }
}