using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Svg
{
///
/// A wrapper for a paint server which isn't defined currently in the parse process, but
/// should be defined by the time the image needs to render.
///
public class SvgDeferredPaintServer : SvgPaintServer
{
private bool _serverLoaded = false;
private SvgPaintServer _concreteServer;
public SvgDocument Document { get; set; }
public string DeferredId { get; set; }
public SvgDeferredPaintServer() { }
public SvgDeferredPaintServer(SvgDocument document, string id)
{
this.Document = document;
this.DeferredId = id;
}
private void EnsureServer()
{
if (!_serverLoaded)
{
_concreteServer = this.Document.IdManager.GetElementById(this.DeferredId) as SvgPaintServer;
_serverLoaded = true;
}
}
public override System.Drawing.Brush GetBrush(SvgVisualElement styleOwner, float opacity)
{
EnsureServer();
return _concreteServer.GetBrush(styleOwner, opacity);
}
public override SvgElement DeepCopy()
{
return DeepCopy();
}
public override SvgElement DeepCopy()
{
var newObj = base.DeepCopy() as SvgDeferredPaintServer;
newObj.Document = this.Document;
newObj.DeferredId = this.DeferredId;
return newObj;
}
public override bool Equals(object obj)
{
var other = obj as SvgDeferredPaintServer;
if (other == null)
return false;
return this.Document == other.Document && this.DeferredId == other.DeferredId;
}
public override int GetHashCode()
{
if (this.Document == null || this.DeferredId == null) return 0;
return this.Document.GetHashCode() ^ this.DeferredId.GetHashCode();
}
public override string ToString()
{
return (_serverLoaded ? _serverLoaded.ToString() : string.Format("deferred: {0}", this.DeferredId));
}
public static T TryGet(SvgPaintServer server) where T : SvgPaintServer
{
var deferred = server as SvgDeferredPaintServer;
if (deferred == null)
{
return server as T;
}
else
{
deferred.EnsureServer();
return deferred._concreteServer as T;
}
}
}
}