-
Eric Domke authored
- Adding W3C test cases and a test fixture - Fixed support for CSS stylesheets (particularly when class names are referenced) - Refactoring unit calculations so that percentages and fractions calculate more accurately - SvgImage: - Support PreserveAspectRatio attribute - Support for referencing svg images - Refactored text rendering to use the AttributeCollection inheritance scheme - Initial attempt at 'ex' unit support - Added support for system color names - Changed parsing of entities to support XML entities - Supporting loading of a svg document directly from a XmlDocument with requiring serializing the document as a string first. - ...
d5c659a5
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Svg
{
/// <summary>
/// Provides methods to ensure element ID's are valid and unique.
/// </summary>
public class SvgElementIdManager
{
private SvgDocument _document;
private Dictionary<string, SvgElement> _idValueMap;
/// <summary>
/// Retrieves the <see cref="SvgElement"/> with the specified ID.
/// </summary>
/// <param name="id">A <see cref="string"/> containing the ID of the element to find.</param>
/// <returns>An <see cref="SvgElement"/> of one exists with the specified ID; otherwise false.</returns>
public virtual SvgElement GetElementById(string id)
{
if (id.StartsWith("url("))
{
id = id.Substring(4);
id = id.TrimEnd(')');
}
if (id.StartsWith("#"))
{
id = id.Substring(1);
}
SvgElement element = null;
this._idValueMap.TryGetValue(id, out element);
return element;
}
public virtual SvgElement GetElementById(Uri uri)
{
return this.GetElementById(uri.ToString());
}
/// <summary>
/// Adds the specified <see cref="SvgElement"/> for ID management.
/// </summary>
/// <param name="element">The <see cref="SvgElement"/> to be managed.</param>
public virtual void Add(SvgElement element)
{
if (!string.IsNullOrEmpty(element.ID))
{
this.EnsureValidId(element.ID);
this._idValueMap.Add(element.ID, element);
}
OnAdded(element);
}
/// <summary>
/// Removed the specified <see cref="SvgElement"/> from ID management.
/// </summary>
/// <param name="element">The <see cref="SvgElement"/> to be removed from ID management.</param>
public virtual void Remove(SvgElement element)
{
if (!string.IsNullOrEmpty(element.ID))
{
this._idValueMap.Remove(element.ID);
}
OnRemoved(element);
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
}
/// <summary>
/// Ensures that the specified ID is valid within the containing <see cref="SvgDocument"/>.
/// </summary>
/// <param name="id">A <see cref="string"/> containing the ID to validate.</param>
/// <exception cref="SvgException">
/// <para>The ID cannot start with a digit.</para>
/// <para>An element with the same ID already exists within the containing <see cref="SvgDocument"/>.</para>
/// </exception>
public void EnsureValidId(string id)
{
if (string.IsNullOrEmpty(id))
{
return;
}
if (char.IsDigit(id[0]))
{
throw new SvgException("ID cannot start with a digit: '" + id + "'.");
}
if (this._idValueMap.ContainsKey(id))
{
throw new SvgException("An element with the same ID already exists: '" + id + "'.");
}
}
/// <summary>
/// Initialises a new instance of an <see cref="SvgElementIdManager"/>.
/// </summary>
/// <param name="document">The <see cref="SvgDocument"/> containing the <see cref="SvgElement"/>s to manage.</param>
public SvgElementIdManager(SvgDocument document)
{
this._document = document;
this._idValueMap = new Dictionary<string, SvgElement>();
}
public event EventHandler<SvgElementEventArgs> ElementAdded;
public event EventHandler<SvgElementEventArgs> ElementRemoved;
protected void OnAdded(SvgElement element)
{
var handler = ElementAdded;
if(handler != null)
{
handler(this._document, new SvgElementEventArgs{ Element = element });
}
}
protected void OnRemoved(SvgElement element)
{
var handler = ElementRemoved;
if(handler != null)
{
handler(this._document, new SvgElementEventArgs{ Element = element });
}
}
}
public class SvgElementEventArgs : EventArgs
{
public SvgElement Element;
}
}