added more events and fixed IdManager bug

Source/Basic Shapes/SvgVisualElement.cs

@@ -61,7 +61,6 @@ namespace Svg
             set { this.Attributes["clip-rule"] = value; }
         }
 
-
 		/// <summary>
 		/// Gets the associated <see cref="SvgClipPath"/> if one has been specified.
 		/// </summary>
@@ -72,7 +71,6 @@ namespace Svg
 			set { this.Attributes["filter"] = value; }
 		}
 
-
         /// <summary>
         /// Gets or sets a value to determine if anti-aliasing should occur when the element is being rendered.
         /// </summary>

Source/Document Structure/SvgDefinitionList.cs

@@ -26,7 +26,6 @@ namespace Svg
             // Do nothing. Children should NOT be rendered.
         }
 
-
 		public override SvgElement DeepCopy()
 		{
 			return DeepCopy<SvgDefinitionList>();

Source/Painting/SvgGradientServer.cs

@@ -88,7 +88,7 @@ namespace Svg
         /// <summary>
         /// Gets or sets another gradient fill from which to inherit the stops from.
         /// </summary>
-        [SvgAttributeAttribute("href")]
+        [SvgAttribute("href")]
         public SvgGradientServer InheritGradient
         {
             get { return this._inheritGradient; }

Source/SvgAttributeCollection.cs

@@ -87,7 +87,90 @@ namespace Svg
         public new object this[string attributeName]
         {
             get { return this.GetInheritedAttribute<object>(attributeName); }
-            set { base[attributeName] = value; }
+            set 
+            {
+            	if(base.ContainsKey(attributeName))
+            	{
+	            	var oldVal = base[attributeName];
+	            	base[attributeName] = value;
+	            	if(oldVal != value) OnAttributeChanged(attributeName, value);
+            	}
+            	else
+            	{
+            		base[attributeName] = value;
+	            	OnAttributeChanged(attributeName, value);
+            	}
+            }
+        }
+        
+        /// <summary>
+        /// Fired when an Atrribute has changed
+        /// </summary>
+        public event EventHandler<AttributeEventArgs> AttributeChanged;
+        
+        protected void OnAttributeChanged(string attribute, object value)
+        {
+        	var handler = AttributeChanged;
+        	if(handler != null)
+        	{
+        		handler(this._owner, new AttributeEventArgs { Attribute = attribute, Value = value });
+        	}
+        }
+    }
+    
+    
+    /// <summary>
+    /// A collection of Custom Attributes
+    /// </summary>
+    public sealed class SvgCustomAttributeCollection : Dictionary<string, string>
+    {
+        private SvgElement _owner;
+
+        /// <summary>
+        /// Initialises a new instance of a <see cref="SvgAttributeCollection"/> with the given <see cref="SvgElement"/> as the owner.
+        /// </summary>
+        /// <param name="owner">The <see cref="SvgElement"/> owner of the collection.</param>
+        public SvgCustomAttributeCollection(SvgElement owner)
+        {
+            this._owner = owner;
+        }
+
+        /// <summary>
+        /// Gets the attribute with the specified name.
+        /// </summary>
+        /// <param name="attributeName">A <see cref="string"/> containing the attribute name.</param>
+        /// <returns>The attribute value associated with the specified name; If there is no attribute the parent's value will be inherited.</returns>
+        public new string this[string attributeName]
+        {
+        	get { return base[attributeName]; }
+            set 
+            {
+            	if(base.ContainsKey(attributeName))
+            	{
+	            	var oldVal = base[attributeName];
+	            	base[attributeName] = value;
+	            	if(oldVal != value) OnAttributeChanged(attributeName, value);
+            	}
+            	else
+            	{
+            		base[attributeName] = value;
+	            	OnAttributeChanged(attributeName, value);
+            	}
+            }
+        }
+        
+        /// <summary>
+        /// Fired when an Atrribute has changed
+        /// </summary>
+        public event EventHandler<AttributeEventArgs> AttributeChanged;
+        
+        protected void OnAttributeChanged(string attribute, object value)
+        {
+        	var handler = AttributeChanged;
+        	if(handler != null)
+        	{
+        		handler(this._owner, new AttributeEventArgs { Attribute = attribute, Value = value });
+        	}
         }
     }
 }
\ No newline at end of file

Source/SvgDocument.cs

@@ -45,6 +45,17 @@ namespace Svg
             }
         }
         
+        /// <summary>
+        /// Overwrites the current IdManager with a custom implementation. 
+        /// Be careful with this: If elements have been inserted into the document before,
+        /// you have to take care that the new IdManager also knows of them.
+        /// </summary>
+        /// <param name="manager"></param>
+        public void OverwriteIdManager(SvgElementIdManager manager)
+        {
+        	_idManager = manager;
+        }
+
         /// <summary>
         /// Gets or sets the Pixels Per Inch of the rendered image.
         /// </summary>

Source/SvgElement.cs

@@ -41,7 +41,7 @@ namespace Svg
         private SvgElementCollection _children;
         private static readonly object _loadEventKey = new object();
         private Matrix _graphicsMatrix;
-        private Dictionary<string, string> _customAttributes;
+        private SvgCustomAttributeCollection _customAttributes;
 
         /// <summary>
         /// Gets the name of the element.
@@ -122,21 +122,17 @@ namespace Svg
         public virtual SvgDocument OwnerDocument
         {
         	get
-            {
-                if (Parent == null)
         	{
         		if (this is SvgDocument)
         		{
-                        return (SvgDocument)this;
-                    }
-                    else
-                    {
-                        return null;
-                    }
+        			return this as SvgDocument;
         		}
         		else
         		{
+        			if(this.Parent != null)
         				return Parent.OwnerDocument;
+        			else
+        				return null;
         		}
         	}
         }
@@ -157,7 +153,10 @@ namespace Svg
             }
         }
 
-        public Dictionary<string, string> CustomAttributes
+        /// <summary>
+        /// Gets a collection of custom attributes
+        /// </summary>
+        public SvgCustomAttributeCollection CustomAttributes
         {
             get { return this._customAttributes; }
         }
@@ -301,7 +300,11 @@ namespace Svg
             this._children = new SvgElementCollection(this);
             this._eventHandlers = new EventHandlerList();
             this._elementName = string.Empty;
-            this._customAttributes = new Dictionary<string, string>();
+            this._customAttributes = new SvgCustomAttributeCollection(this);
+            
+            //subscribe to attribute events
+            Attributes.AttributeChanged += Attributes_AttributeChanged;
+            CustomAttributes.AttributeChanged += Attributes_AttributeChanged;
 
             //find svg attribute descriptions
             _svgPropertyAttributes = from PropertyDescriptor a in TypeDescriptor.GetProperties(this)
@@ -316,6 +319,12 @@ namespace Svg
 
         }
 
+        //dispatch attribute event
+        void Attributes_AttributeChanged(object sender, AttributeEventArgs e)
+        {
+        	OnAttributeChanged(e);
+        }
+
 		public virtual void InitialiseFromXML(XmlTextReader reader, SvgDocument document)
 		{
             throw new NotImplementedException();
@@ -629,6 +638,20 @@ namespace Svg
 			return newObj;
         }
 		
+		/// <summary>
+        /// Fired when an Atrribute of this Element has changed
+        /// </summary>
+		public event EventHandler<AttributeEventArgs> AttributeChanged;
+		
+		protected void OnAttributeChanged(AttributeEventArgs args)
+		{
+			var handler = AttributeChanged;
+			if(handler != null)
+			{
+				handler(this, args);
+			}
+		}
+
         #region graphical EVENTS
 
         /*  
@@ -663,6 +686,25 @@ namespace Svg
             }
         }
         
+        /// <summary>
+        /// Use this method to provide your implementation ISvgEventCaller to unregister Actions
+        /// </summary>
+        /// <param name="caller"></param>
+        public void UnregisterEvents(ISvgEventCaller caller)
+        {
+        	if (caller != null && !string.IsNullOrWhiteSpace(this.ID))
+        	{
+        		var rpcID = this.ID + "/";
+
+        		caller.UnregisterAction(rpcID + "onclick");
+        		caller.UnregisterAction(rpcID + "onmousedown");
+        		caller.UnregisterAction(rpcID + "onmouseup");
+        		caller.UnregisterAction(rpcID + "onmousemove");
+        		caller.UnregisterAction(rpcID + "onmouseover");
+        		caller.UnregisterAction(rpcID + "onmouseout");
+        	}
+        }
+
         [SvgAttribute("onclick")]
         public event EventHandler<MouseArg> Click;
 
@@ -775,6 +817,15 @@ namespace Svg
 
     }
     
+    /// <summary>
+    /// Describes the Attribute which was set
+    /// </summary>
+    public class AttributeEventArgs : EventArgs
+    {
+    	public string Attribute;
+    	public object Value;
+    }
+
     //deriving class registers event actions and calls the actions if the event occurs
     public interface ISvgEventCaller
     {
@@ -783,6 +834,7 @@ namespace Svg
         void RegisterAction<T1, T2>(string rpcID, Action<T1, T2> action);
         void RegisterAction<T1, T2, T3>(string rpcID, Action<T1, T2, T3> action);
         void RegisterAction<T1, T2, T3, T4>(string rpcID, Action<T1, T2, T3, T4> action);
+        void UnregisterAction(string rpcID);
     }
 
     /// <summary>

Source/SvgElementCollection.cs

@@ -78,7 +78,7 @@ namespace Svg
             {
                 if (this._owner.OwnerDocument != null)
                 {
-                    this._owner.OwnerDocument.IdManager.Add(item);
+                    item.ApplyRecursive(this._owner.OwnerDocument.IdManager.Add);
                 }
 
                 item._parent = this._owner;
@@ -132,7 +132,7 @@ namespace Svg
 
                     if (this._owner.OwnerDocument != null)
                     {
-                        this._owner.OwnerDocument.IdManager.Remove(item);
+                        item.ApplyRecursive(this._owner.OwnerDocument.IdManager.Remove);
                     }
                 }
             }

Source/SvgElementIdManager.cs

@@ -52,6 +52,8 @@ namespace Svg
                 this.EnsureValidId(element.ID);
                 this._idValueMap.Add(element.ID, element);
             }
+            
+            OnAdded(element);
         }
 
         /// <summary>
@@ -64,6 +66,8 @@ namespace Svg
             {
                 this._idValueMap.Remove(element.ID);
             }
+            
+            OnRemoved(element);
         }
 
         /// <summary>
@@ -101,5 +105,32 @@ namespace Svg
             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;
     }
 }
\ No newline at end of file

Source/SvgExtentions.cs

@@ -52,5 +52,16 @@ namespace Svg
         {
         	return element.CustomAttributes.ContainsKey(name) && !string.IsNullOrEmpty(element.CustomAttributes[name]);
         }
+        
+        public static void ApplyRecursive(this SvgElement elem, Action<SvgElement> action)
+        {
+        	action(elem);
+        	
+        	foreach (var element in elem.Children)
+        	{
+        		if(!(elem is SvgDocument))
+        			element.ApplyRecursive(action);
+        	}
+        }
     }
 }