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using System;
namespace Netron.Lithium
{
/// <summary>
/// Deletion of shapes is implemented via a visitor pattern to handle the fact
/// that child nodes have to be deleted before its parent
/// </summary>
public class DeleteVisitor: IVisitor
{
#region Fields
/// <summary>
/// Occurs when a shape is deleted
/// </summary>
public event ShapeData OnDelete;
/// <summary>
/// the reference to the abstract
/// </summary>
GraphAbstract graphAbstract;
#endregion
#region Constructor
/// <summary>
/// Constructor
/// </summary>
/// <param name="graphAbstract">a GraphAbstract instance</param>
public DeleteVisitor(GraphAbstract graphAbstract)
{
this.graphAbstract = graphAbstract;
}
#endregion
/// <summary>
/// Visits the shape
/// </summary>
/// <param name="sh"></param>
public void Visit(ShapeBase sh)
{
//remove from the shape from the Shapes
if(sh==null) return;
//strictly speaking we should remove the shape from its parent's childNodes collection first
graphAbstract.Connections.Remove(sh.connection);
graphAbstract.Shapes.Remove(sh);
if(OnDelete!=null)
OnDelete(sh);
}
/// <summary>
/// Gets whether the visiting is done
/// </summary>
public bool IsDone
{
get
{
// TODO: Add DeleteVisitor.IsDone getter implementation
return false;
}
}
}
}
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Richard Northedge is a senior developer with a UK Microsoft Gold Partner company. He has a postgraduate degree in English Literature, has been programming professionally since 1998 and has been an MCSD since 2000.