Canvas/Utils/Undo.cs

（开头部分） 4KB

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using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;

namespace Canvas
{
	class EditCommandBase
	{
		public virtual bool DoUndo(IModel data)
		{
			return false;
		}
		public virtual bool DoRedo(IModel data)
		{
			return false;
		}
	}
	class EditCommandAdd : EditCommandBase
	{
		List<IDrawObject> m_objects = null;
		IDrawObject m_object;
		ICanvasLayer m_layer;
		public EditCommandAdd(ICanvasLayer layer, IDrawObject obj)
		{
			m_object = obj;
			m_layer = layer;
		}
		public EditCommandAdd(ICanvasLayer layer, List<IDrawObject> objects)
		{
			m_objects = new List<IDrawObject>(objects);
			m_layer = layer;
		}
		public override bool DoUndo(IModel data)
		{
			if (m_object != null)
				data.DeleteObjects(new IDrawObject[] { m_object });
			if (m_objects != null)
				data.DeleteObjects(m_objects);
			return true;
		}
		public override bool DoRedo(IModel data)
		{
			if (m_object != null)
				data.AddObject(m_layer, m_object);
			if (m_objects != null)
			{
				foreach (IDrawObject obj in m_objects)
					data.AddObject(m_layer, obj);
			}
			return true;
		}
	}
	class EditCommandRemove : EditCommandBase
	{
		Dictionary<ICanvasLayer, List<IDrawObject>> m_objects = new Dictionary<ICanvasLayer, List<IDrawObject>>();
		public EditCommandRemove()
		{
		}
		public void AddLayerObjects(ICanvasLayer layer, List<IDrawObject> objects)
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