using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
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;
}
public void EnsureServer(SvgElement styleOwner)
{
if (!_serverLoaded)
{
if (this.DeferredId == "currentColor" && styleOwner != null)
{
var colorElement = (from e in styleOwner.ParentsAndSelf.OfType()
where e.Color != SvgPaintServer.None && e.Color != SvgColourServer.NotSet &&
e.Color != SvgColourServer.Inherit && e.Color != SvgColourServer.None
select e).FirstOrDefault();
_concreteServer = (colorElement == null ? SvgColourServer.NotSet : colorElement.Color);
}
else
{
_concreteServer = this.Document.IdManager.GetElementById(this.DeferredId) as SvgPaintServer;
}
_serverLoaded = true;
}
}
public override Brush GetBrush(SvgVisualElement styleOwner, ISvgRenderer renderer, float opacity, bool forStroke = false)
{
EnsureServer(styleOwner);
return _concreteServer.GetBrush(styleOwner, renderer, opacity, forStroke);
}
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()
{
if (this.DeferredId == "currentColor")
{
return this.DeferredId;
}
else
{
return string.Format("url({0})", this.DeferredId);
}
}
public static T TryGet(SvgPaintServer server, SvgElement parent) where T : SvgPaintServer
{
var deferred = server as SvgDeferredPaintServer;
if (deferred == null)
{
return server as T;
}
else
{
deferred.EnsureServer(parent);
return deferred._concreteServer as T;
}
}
}
}