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Posted 14 Dec 2003

RSS 2.0 Framework

, 19 Jan 2013
RSS 2.0 framework implements the RSS 2.0 specification in strongly typed classes. The framework enables you to create and consume valid RSS 2.0 feeds in your code in just a few minutes.
Raccoom.Xml.dll
Raccoom.Xml.Editors.exe
DockingManagerExtender.dll
MagicLibrary.DLL
Raccoom.Windows.Forms.dll
Raccoom.Bin
DockingManagerExtender.dll
MagicLibrary.DLL
nunit.framework.dll
Raccoom.Windows.Forms
Windows
Forms
Design
Raccoom.Xml
Properties
Raccoom.Xml.csproj.user
Xml
atom.xsx
Raccoom.Xml.Editors
ActionList
Actions
Design
App.ico
Raccoom.Xml.Editors.csproj.user
Windows
Forms
Raccoom.Xml.Test
Resources
rsschannel.rss
bin
Raccoom.Xml.chm
rsschannel.rss
Raccoom.Xml.csproj.user
atom.xsx
setup.exe
// Copyright � 2004 by Christoph Richner. All rights are reserved.
// 
// If you like this code then feel free to go ahead and use it.
// The only thing I ask is that you don't remove or alter my copyright notice.
//
// Your use of this software is entirely at your own risk. I make no claims or
// warrantees about the reliability or fitness of this code for any particular purpose.
// If you make changes or additions to this code please mark your code as being yours.
// 
// website http://raccoom.sytes.net, email microweb@bluewin.ch, msn chrisdarebell@msn.com
 
using System;
using System.ComponentModel;
using System.Collections;
using System.Diagnostics;
using System.Windows.Forms;
using Raccoom.Xml;

namespace Raccoom.Windows.Forms
{
	/// <summary>
	/// Summary description for ComboboxOpml.
	/// </summary>
	public class TreeViewOpmlDocument : System.Windows.Forms.TreeView
	{
		#region fields
		public delegate void DocumentPropertyChangedDelegate(object sender, TreeNodeOpmlOutline node, PropertyChangedEventArgs e);
		public enum ContentType{ FoldersAndContent, Folders }
		public enum ViewStyle { Document,Flat }
		private enum DragDropActions{None, FavFo, FavFav, FoFo, FoFav, FavRoot, FoRoot}
		private ContentType _contentType;
		private ViewStyle _viewStyle;
		private TreeNodeCollection _rootCollection;
		private System.Windows.Forms.ImageList _imageList;
		private System.ComponentModel.IContainer components;
		private OpmlDocument _document;		
		#endregion

		#region constructors
		public TreeViewOpmlDocument(System.ComponentModel.IContainer container)
		{
			container.Add(this);
			InitializeComponent();
		}

		public TreeViewOpmlDocument()
		{			
			InitializeComponent();            
		}

		#endregion

		#region public interface
		[Category("View")]
		public ContentType Type
		{
			get
			{
				return _contentType;
			}
			set
			{
				_contentType = value;
			}
		}
		[Category("View")]
		public ViewStyle Style
		{
			get
			{
				return _viewStyle;
			}
			set
			{
				_viewStyle = value;
			}
		}
		public void Populate(OpmlDocument document)
		{	
			
			bool changed = (_document != document);
			//
			if(changed && _document!=null) _document.PropertyChanged -= new PropertyChangedEventHandler(DocumentPropertyChanged);
			_document = document;
			//
			if(changed) _document.PropertyChanged += new PropertyChangedEventHandler(DocumentPropertyChanged);
			//
			this.Cursor = Cursors.WaitCursor;
			BeginUpdate();
			this.Nodes.Clear();
			try
			{
				switch (_viewStyle)
				{
					case ViewStyle.Document:
						TreeNodeOpmlOutline favoriteRoot = new TreeNodeOpmlOutline(null,0,1);
						favoriteRoot.Text = document.Head.Title;
						_rootCollection = favoriteRoot.Nodes;
						Populate(_rootCollection, document.Body.Items);
						this.Nodes.Add(favoriteRoot);
						favoriteRoot.Expand();
						//
						break;
					case ViewStyle.Flat:						
						_rootCollection = this.Nodes;
						Populate(_rootCollection, document.Body.Items);						
						break;
				}
				
			} 
			catch (System.Exception e)
			{
				throw e;
			}
			finally
			{
				this.Cursor = Cursors.Default;
				EndUpdate();
			}
		}
		public TreeNodeOpmlOutline CreateNewFolder(TreeNodeOpmlOutline parent, OpmlOutline outline)
		{
			return CreateNewFolder(parent, outline, null);
		}
		public TreeNodeOpmlOutline CreateNewFolder(TreeNodeOpmlOutline parent, OpmlOutline outline, Uri url)
		{
			TreeNodeOpmlOutline node = CreateTreeNode(outline,true);
			if(parent!=null)
			{
				parent.OpmlOutlineItem.Items.Add(outline);
				parent.Nodes.Add(node);
			} 
			else
			{
				this._document.Body.Items.Add(outline);
				_rootCollection.Add(node);
			}
			//
			if(url!=null)
			{
				node.OpmlOutlineItem.Type = OpmlOutline.OpmlTypeLinkReference;				
			}
			//
			return node;
		}
		public void DeleteNode(TreeNodeOpmlOutline node)
		{
			if(node==null || node.Nodes.Equals(this._rootCollection)) return;
			//
			TreeNodeOpmlOutline parentNode = node.Parent as TreeNodeOpmlOutline;
			if(parentNode != null && ! parentNode.Nodes.Equals(this._rootCollection))
			{
				parentNode.OpmlOutlineItem.Items.Remove(node.OpmlOutlineItem);
				parentNode.Nodes.Remove(node);
			} 
			else
			{
				this._document.Body.Items.Remove(node.OpmlOutlineItem);
				Nodes.Remove(node);
			}
		}
		#endregion

		#region private interface	
		private void MoveNode(TreeNodeOpmlOutline sourceNode, TreeNode targetNode)
		{
			DragDropActions ddaction = DragDropActions.None;
			//
			TreeNodeOpmlOutline targetNodeOpml = targetNode as TreeNodeOpmlOutline;
			// Favorite -> Favorite
			if(!sourceNode.IsFolder && targetNodeOpml!=null && !targetNodeOpml.IsFolder)
			{
				ddaction = DragDropActions.FavFav;
			}
				// Favorite -> Folder
			else if(!sourceNode.IsFolder && targetNodeOpml!=null && targetNodeOpml.IsFolder)
			{
				ddaction = DragDropActions.FavFo;
			}
				// Folder -> Favorite 
			else if(sourceNode.IsFolder && targetNodeOpml!=null && !targetNodeOpml.IsFolder)
			{
				ddaction = DragDropActions.FoFav;
			}
				// Folder -> Folder
			else if(sourceNode.IsFolder && targetNodeOpml!=null && targetNodeOpml.IsFolder)
			{
				ddaction = DragDropActions.FoFo;
			}
				// Folder -> Root
			else if(sourceNode.IsFolder && targetNodeOpml.OpmlOutlineItem==null && targetNode.Nodes.Equals(_rootCollection))
			{
				ddaction = DragDropActions.FoRoot;
			}
				// Favorite -> Root
			else if(!sourceNode.IsFolder && targetNodeOpml.OpmlOutlineItem==null && targetNode.Nodes.Equals(_rootCollection))
			{
				ddaction = DragDropActions.FavRoot;
			}
			//
			switch (ddaction)
			{
				case DragDropActions.FavFav:
					// mode sibling					
					TreeNodeOpmlOutline parentParent = targetNodeOpml.Parent as TreeNodeOpmlOutline;
					// Parent seems to be root
					if(parentParent==null) goto case DragDropActions.FavRoot;
					//
					DeleteNode(sourceNode);
					parentParent.OpmlOutlineItem.Items.Add(sourceNode.OpmlOutlineItem);					
					if(parentParent.IsExpanded)
					{						
						parentParent.Nodes.Insert(parentParent.Nodes.IndexOf(targetNodeOpml),sourceNode);
					} 
					else
					{
						parentParent.Expand();
					}
					break;
				case DragDropActions.FoFo:
					DeleteNode(sourceNode);
					targetNodeOpml.OpmlOutlineItem.Items.Add(sourceNode.OpmlOutlineItem);
					if(targetNodeOpml.IsExpanded)
					{						
						targetNodeOpml.Nodes.Insert(0,sourceNode);
					} 
					else
					{
						targetNodeOpml.Expand();
					}					
					break;
				case DragDropActions.FavFo:
					DeleteNode(sourceNode);
					targetNodeOpml.OpmlOutlineItem.Items.Add(sourceNode.OpmlOutlineItem);
					if(targetNodeOpml.IsExpanded)
					{						
						targetNodeOpml.Nodes.Insert(0,sourceNode);
					} 
					else
					{
						targetNodeOpml.Expand();
					}	
					targetNodeOpml.Nodes.Add(sourceNode);
					break;
				case DragDropActions.FavRoot:
					// folder and favorite -> root
					goto case DragDropActions.FoRoot;
				case DragDropActions.FoFav:
					break;
				case DragDropActions.FoRoot:
					DeleteNode(sourceNode);
					_rootCollection.Add(sourceNode);
					_document.Body.Items.Add(sourceNode.OpmlOutlineItem);
					break;
			}
		}
		private void Populate(TreeNodeCollection nodeCollection, OpmlOutlineCollection itemCollection)
		{
			foreach(OpmlOutline item in itemCollection)
			{	
				// linked favorites
				if (item.Type == OpmlOutline.OpmlTypeLinkReference)
				{
					TreeNodeOpmlOutline favoriteNode = CreateTreeNode(item, true);
					nodeCollection.Add(favoriteNode);
				}
				// folder
				else if(item.Items.Count > 0 && item.Type != OpmlOutline.OpmlTypeLinkReference)
				{					
					TreeNodeOpmlOutline node = CreateTreeNode(item, true);
					nodeCollection.Add(node);
				}				
				// favorite
				else if(_contentType==ContentType.FoldersAndContent) 
				{	
					TreeNodeOpmlOutline favoriteNode = CreateTreeNode(item, false);
					nodeCollection.Add(favoriteNode);
				}						
			}
		}
		private TreeNodeOpmlOutline CreateTreeNode(OpmlOutline outline, bool isParent)
		{			
			TreeNodeOpmlOutline node = new TreeNodeOpmlOutline(outline,4,5);
			//
			if(isParent)
			{
				node.ImageIndex = 2;
				node.SelectedImageIndex = 3;
			}
			//
			if(isParent) node.AddDummyNode();
			//
			return node;
		}
		
		private TreeNodeOpmlOutline FindNodeRecursive(OpmlOutline outline, TreeNodeCollection nodes)
		{
			foreach(TreeNodeOpmlOutline node in nodes)
			{
				if(node.OpmlOutlineItem!=null)
				{
					if(node.OpmlOutlineItem.Equals(outline)) return node;
				}
				TreeNodeOpmlOutline subNode =FindNodeRecursive(outline, node.Nodes);
				if(subNode!=null) return subNode;
			}
			return null;
		}
		#endregion

		#region events
		private void DocumentPropertyChanged(object sender, PropertyChangedEventArgs e)
		{
			if(this.InvokeRequired)
			{
				this.Invoke(new DocumentPropertyChangedDelegate(OnDocumentPropertyChanged),new object[]{sender, FindNodeRecursive(sender as OpmlOutline, this.Nodes),e});
			} 
			else
			{
				OnDocumentPropertyChanged(sender, FindNodeRecursive(sender as OpmlOutline, this.Nodes) ,e);
			}
		}		
		protected virtual void OnDocumentPropertyChanged(object sender, TreeNodeOpmlOutline node, PropertyChangedEventArgs e)
		{
			if(e.PropertyName == "Items")
			{
				if(sender is OpmlOutline)
				{
					OpmlOutline outline = (OpmlOutline) sender;					
					if(node==null) return;
					// refresh
					bool expand = node.IsExpanded;
					node.Nodes.Clear();
					this.Populate(node.Nodes, outline.Items);
					if(expand) node.Expand();
				} 
				else if(sender is OpmlBody)
				{
					this.Nodes.Clear();
					this.Populate(this._document);
				}
			} 
			else if(e.PropertyName == "Text")
			{
				OpmlOutline outline = (OpmlOutline) sender;				
				if(node==null || node.IsEditing) return;				
				node.Text = outline.Text;
			}
		}
		protected override void OnKeyUp(KeyEventArgs e)
		{
			switch(e.KeyCode)
			{
				case Keys.Delete:
					this.DeleteNode(this.SelectedNode as Raccoom.Windows.Forms.TreeViewOpmlDocument.TreeNodeOpmlOutline);
					e.Handled = true;
					break;
				case Keys.F2:
					this.SelectedNode.BeginEdit();
					e.Handled = true;
					break;
			}
			//
			base.OnKeyUp (e);
		}

		protected override void OnBeforeExpand(TreeViewCancelEventArgs e)
		{
			TreeNodeOpmlOutline nodeOutline = e.Node as TreeNodeOpmlOutline;
			if(nodeOutline==null || nodeOutline.OpmlOutlineItem == null) return;
			// it's only permitted to show real items, no reference items
			if(nodeOutline.OpmlOutlineItem.Type != OpmlOutline.OpmlTypeLinkReference)
			{
				// populate sub items
				Cursor.Current = Cursors.WaitCursor;
				try
				{			
					nodeOutline.RemoveDummyNode();
					// do we need a refresh ?
					if(e.Node.Nodes.Count == nodeOutline.OpmlOutlineItem.Items.Count) return;
					// clear nodes and refresh view
					nodeOutline.Nodes.Clear();
					// populate
					this.Populate(e.Node.Nodes, nodeOutline.OpmlOutlineItem.Items);
				} 
				catch( System.Exception ex)
				{
					System.Diagnostics.Debug.WriteLine(ex.Message);
				}
				finally
				{
					Cursor.Current = Cursors.Default;
				}
			}
			else
			{
				e.Cancel = true;				
			}
			//
			base.OnBeforeExpand (e);
			
		}

		protected override void OnItemDrag(ItemDragEventArgs e)
		{
			if(e.Item is TreeNodeOpmlOutline)
			{				
				this.DoDragDrop(e.Item,DragDropEffects.All);
			}
			//
			base.OnItemDrag (e);
		}
		protected override void OnDragOver(DragEventArgs drgevent)
		{	
			TreeNodeOpmlOutline sourceNode = drgevent.Data.GetData(typeof(TreeNodeOpmlOutline).FullName) as TreeNodeOpmlOutline;
			TreeNode targetNode = this.GetNodeAt(this.PointToClient(new System.Drawing.Point(drgevent.X, drgevent.Y)));
			drgevent.Effect = (object.Equals(sourceNode, targetNode)) ? DragDropEffects.None : DragDropEffects.Move;
			base.OnDragOver (drgevent);
		}

		protected override void OnDragDrop(DragEventArgs drgevent)
		{
			TreeNodeOpmlOutline sourceNode = drgevent.Data.GetData(typeof(TreeNodeOpmlOutline).FullName) as TreeNodeOpmlOutline;
			TreeNode targetNode = this.GetNodeAt(this.PointToClient(new System.Drawing.Point(drgevent.X, drgevent.Y)));
			if(sourceNode==null || targetNode ==null || object.Equals(sourceNode, targetNode)) return;
			//
			MoveNode(sourceNode, targetNode);
			//
			base.OnDragDrop (drgevent);
		}
		
		protected override void OnBeforeLabelEdit(NodeLabelEditEventArgs e)
		{
			// do not edit the root node
			e.CancelEdit = e.Node.Nodes.Equals(this._rootCollection);
			base.OnBeforeLabelEdit (e);
		}

		protected override void OnAfterLabelEdit(NodeLabelEditEventArgs e)
		{
			TreeNodeOpmlOutline node =  e.Node as TreeNodeOpmlOutline;
			if(node!=null && !e.CancelEdit && e.Label != null)
			{	
				node.OpmlOutlineItem.Text = e.Label;
			}
			//
			base.OnAfterLabelEdit (e);
		}

		#endregion

		#region Component Designer generated code
		/// <summary> 
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}


		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(TreeViewOpmlDocument));
			this._imageList = new System.Windows.Forms.ImageList(this.components);
			// 
			// _imageList
			// 
			this._imageList.ColorDepth = System.Windows.Forms.ColorDepth.Depth32Bit;
			this._imageList.ImageSize = new System.Drawing.Size(16, 16);
			this._imageList.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("_imageList.ImageStream")));
			this._imageList.TransparentColor = System.Drawing.Color.Transparent;
			// 
			// TreeViewOpmlDocument
			// 
			this.ImageIndex = 0;
			this.ImageList = this._imageList;
			this.SelectedImageIndex = 0;

		}
		#endregion

		#region nested classes
		public class TreeNodeOpmlOutline : TreeNode
		{
			private OpmlOutline _outline;
			
			public TreeNodeOpmlOutline(OpmlOutline outline, int imageIndex, int selectedImageIndex)
			{
				_outline = outline;				
				if(_outline!=null) 	this.Text = _outline.Text;
				this.ImageIndex = imageIndex;
				this.SelectedImageIndex = selectedImageIndex;				
			}
			public OpmlOutline OpmlOutlineItem
			{
				get
				{
					return _outline;
				}
				set
				{
					_outline = value;
				}
			}
			public bool IsFolder
			{
				get
				{					
					if(_outline==null) return true;
					//
					return _outline.Items.Count>0 || _outline.XmlUrl==null;
				}
			}
			
			/// <summary>
			/// Adds a dummy node to the parent node
			/// </summary>		
			public virtual void AddDummyNode()
			{
				TreeNodeOpmlOutline node = new TreeNodeOpmlOutline(null,-1,-1);
				node.Text = "@@Dummy@@";
				Nodes.Add(node);
			}
			/// <summary>
			/// Removes the dummy node from the parent node.
			/// </summary>		
			public virtual void RemoveDummyNode()
			{
				if ((Nodes.Count == 1 ) & (Nodes[0].Text == "@@Dummy@@"))
				{
					Nodes[0].Remove();
				}
			}
		}
		#endregion		
	}
}

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This article, along with any associated source code and files, is licensed under The GNU Lesser General Public License (LGPLv3)

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About the Author

Chris Richner
Software Developer (Senior) Zeit AG
Switzerland Switzerland
My interest is in the future because I am going to spend the rest of my life there. (Charles Kettering)

Biography

  • 1996 - 1998 PC Board PPL, HTML, DHTML, Javascript and ASP

  • 1999 - 2001 coding Centura against Sql Database (SqlBase,MSSQL,Oracle)

  • 2002 - 2004 C# Windows Forms

  • 2005 - 2006 C# ASP.NET, Windows Forms

  • 2006 - 2009 C#, WCF, WF, WPF

  • 2010 - 2012 C#, Dynamics CRM, Sharepoint, Silverlight

  • 2013 - 2013 C#, WCF DS (OData), WF, WPF

  • 2014 - now C#, Azure PaaS, Identity, OWIN, OData, Web Api


Interests

  • family & friends

  • chilaxing ,)

  • coding

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