DrawToolsRedux/CommandChangeState.cs

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using System.Collections.Generic;

namespace DrawTools
{
	/// <summary>
	/// Changing state of existing objects:
	/// move, resize, change properties.
	/// </summary>
	internal class CommandChangeState : Command
	{
		// Selected object(s) before operation
		private List<DrawObject> listBefore;

		// Selected object(s) after operation
		private List<DrawObject> listAfter;

		// Track the active Layer where the change took place
		private int activeLayer;

		// Create this command BEFORE operation.
		public CommandChangeState(Layers layerList)
		{
			// Keep objects state before operation.
			activeLayer = layerList.ActiveLayerIndex;
			FillList(layerList[activeLayer].Graphics, ref listBefore);
		}

		// Call this function AFTER operation.
		public void NewState(Layers layerList)
		{
			// Keep objects state after operation.
			FillList(layerList[activeLayer].Graphics, ref listAfter);
		}

		public override void Undo(Layers list)
		{
			// Replace all objects in the list with objects from listBefore
			ReplaceObjects(list[activeLayer].Graphics, listBefore);
		}

		public override void Redo(Layers list)
		{
			// Replace all objects in the list with objects from listAfter
			ReplaceObjects(list[activeLayer].Graphics, listAfter);
		}

		// Replace objects in graphicsList with objects from list
		private void ReplaceObjects(GraphicsList graphicsList, List<DrawObject> list)
		{
			for (int i = 0; i < graphicsList.Count; i++)
			{
				DrawObject replacement = null;

				foreach (DrawObject o in list)
				{
					if (o.ID ==
					    graphicsList[i].ID)
					{
						replacement = o;
						break;