~/App_Code/Adapters/TreeViewAdapter.cs

C#
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using System;
using System.Collections.Specialized;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Configuration;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Reflection;

namespace CSSFriendly
{
    public class TreeViewAdapter : System.Web.UI.WebControls.Adapters.HierarchicalDataBoundControlAdapter, IPostBackEventHandler, IPostBackDataHandler
    {
        private WebControlAdapterExtender _extender = null;
        private WebControlAdapterExtender Extender
        {
            get
            {
                if (((_extender == null) && (Control != null)) ||
                    ((_extender != null) && (Control != _extender.AdaptedControl)))
                {
                    _extender = new WebControlAdapterExtender(Control);
                }

                System.Diagnostics.Debug.Assert(_extender != null, "CSS Friendly adapters internal error", "Null extender instance");
                return _extender;
            }
        }

        private int _checkboxIndex = 1;
        private HiddenField _viewState = null;
        private bool _updateViewState = false;
        private string _newViewState = "";

        public TreeViewAdapter()
        {
            if (_viewState == null)
            {
                _viewState = new HiddenField();
            }
        }

        // Implementation of IPostBackDataHandler
        public virtual bool LoadPostData(string postDataKey, NameValueCollection postCollection)
        {
            return true;
        }

        public virtual void RaisePostDataChangedEvent()
        {
            TreeView treeView = Control as TreeView;
            if (treeView != null)
            {
                TreeNodeCollection items = treeView.Nodes;
                _checkboxIndex = 1;
                UpdateCheckmarks(items);
            }
        }

        // Implementation of IPostBackEventHandler
        public void RaisePostBackEvent(string eventArgument)
        {
            TreeView treeView = Control as TreeView;
            if (treeView != null)
            {
                TreeNodeCollection items = treeView.Nodes;
                if (!String.IsNullOrEmpty(eventArgument))
                {
                    if (eventArgument.StartsWith("s") || eventArgument.StartsWith("e"))
                    {
                        string selectedNodeValuePath = eventArgument.Substring(1).Replace("\\", "/");
                        TreeNode selectedNode = treeView.FindNode(selectedNodeValuePath);
                        if (selectedNode != null)
                        {
                            bool bSelectedNodeChanged = selectedNode != treeView.SelectedNode;
                            ClearSelectedNode(items);
                            selectedNode.Selected = true; // does not raise the SelectedNodeChanged event so we have to do it manually (below).
                            if (eventArgument.StartsWith("e"))
                            {
                                selectedNode.Expand();
                            }

                            if (bSelectedNodeChanged)
                            {
                                Extender.RaiseAdaptedEvent("SelectedNodeChanged", new EventArgs());
                            }
                        }
                    }
                    else if (eventArgument.StartsWith("p"))
                    {
                        string parentNodeValuePath = eventArgument.Substring(1).Replace("\\", "/");
                        TreeNode parentNode = treeView.FindNode(parentNodeValuePath);
                        if ((parentNode != null) && ((parentNode.ChildNodes == null) || (parentNode.ChildNodes.Count == 0)))
                        {
                            parentNode.Expand(); // Raises the TreeNodePopulate event
                        }
                    }
                }
            }
        }

        protected override Object SaveAdapterViewState()
        {
            string retStr = "";
            TreeView treeView = Control as TreeView;
            if ((treeView != null) && (_viewState != null))
            {
                if ((_viewState != null) && (Page != null) && (Page.Form != null) && (!Page.Form.Controls.Contains(_viewState)))
                {
                    Panel panel = new Panel();
                    panel.Controls.Add(_viewState);
                    Page.Form.Controls.Add(panel);
                    string script = "document.getElementById('" + _viewState.ClientID + "').value = GetViewState__AspNetTreeView('" + Extender.MakeChildId("UL") + "');";
                    Page.ClientScript.RegisterOnSubmitStatement(typeof(TreeViewAdapter), _viewState.ClientID, script);
                }
                retStr = _viewState.UniqueID + "|" + ComposeViewState(treeView.Nodes, "");
            }
            return retStr;
        }

        protected override void LoadAdapterViewState(Object state)
        {
            TreeView treeView = Control as TreeView;
            string oldViewState = state as String;
            if ((treeView != null) && (oldViewState != null) && (oldViewState.Split('|').Length == 2))
            {
                string hiddenInputName = oldViewState.Split('|')[0];
                string oldExpansionState = oldViewState.Split('|')[1];
                if (!treeView.ShowExpandCollapse)
                {
                    _newViewState = oldExpansionState;
                    _updateViewState = true;
                }
                else if (!String.IsNullOrEmpty(Page.Request.Form[hiddenInputName]))
                {
                    _newViewState = Page.Request.Form[hiddenInputName];
                    _updateViewState = true;
                }
            }
        }

        protected override void OnInit(EventArgs e)
        {
            if (Extender.AdapterEnabled)
            {
                _updateViewState = false;
                _newViewState = "";

                TreeView treeView = Control as TreeView;
                if (treeView != null)
                {
                    treeView.EnableClientScript = false;
                }
            }

            base.OnInit(e);

            if (Extender.AdapterEnabled)
            {
                RegisterScripts();
            }
        }

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            TreeView treeView = Control as TreeView;
            if (Extender.AdapterEnabled && _updateViewState && (treeView != null))
            {
                treeView.CollapseAll();
                ExpandToState(treeView.Nodes, _newViewState);
                _updateViewState = false;
            }
        }

        private void RegisterScripts()
        {
            Extender.RegisterScripts();
            string folderPath = WebConfigurationManager.AppSettings.Get("CSSFriendly-JavaScript-Path");
            if (String.IsNullOrEmpty(folderPath))
            {
                folderPath = "~/JavaScript";
            }
            string filePath = folderPath.EndsWith("/") ? folderPath + "TreeViewAdapter.js" : folderPath + "/TreeViewAdapter.js";
            Page.ClientScript.RegisterClientScriptInclude(GetType(), GetType().ToString(), Page.ResolveUrl(filePath));
        }

        protected override void RenderBeginTag(HtmlTextWriter writer)
        {
            if (Extender.AdapterEnabled)
            {
                Extender.RenderBeginTag(writer, "AspNet-TreeView");
            }
            else
            {
                base.RenderBeginTag(writer);
            }
        }

        protected override void RenderEndTag(HtmlTextWriter writer)
        {
            if (Extender.AdapterEnabled)
            {
                Extender.RenderEndTag(writer);
            }
            else
            {
                base.RenderEndTag(writer);
            }
        }

        protected override void RenderContents(HtmlTextWriter writer)
        {
            if (Extender.AdapterEnabled)
            {
                TreeView treeView = Control as TreeView;
                if (treeView != null)
                {
                    writer.Indent++;
                    _checkboxIndex = 1;
                    BuildItems(treeView.Nodes, true, true, writer);
                    writer.Indent--;
                    writer.WriteLine();
                }
            }
            else
            {
                base.RenderContents(writer);
            }
        }

        private void BuildItems(TreeNodeCollection items, bool isRoot, bool isExpanded, HtmlTextWriter writer)
        {
            if (items.Count > 0)
            {
                writer.WriteLine();

                writer.WriteBeginTag("ul");

                if (isRoot)
                {
                    writer.WriteAttribute("id", Extender.MakeChildId("UL"));
                }
                if (!isExpanded)
                {
                    writer.WriteAttribute("class", "AspNet-TreeView-Hide");
                }
                writer.Write(HtmlTextWriter.TagRightChar);
                writer.Indent++;

                foreach (TreeNode item in items)
                {
                    BuildItem(item, writer);
                }

                writer.Indent--;
                writer.WriteLine();
                writer.WriteEndTag("ul");
            }
        }

        private void BuildItem(TreeNode item, HtmlTextWriter writer)
        {
            TreeView treeView = Control as TreeView;
            if ((treeView != null) && (item != null) && (writer != null))
            {
                writer.WriteLine();
                writer.WriteBeginTag("li");
                writer.WriteAttribute("class", GetNodeClass(item));
                writer.Write(HtmlTextWriter.TagRightChar);
                writer.Indent++;
                writer.WriteLine();

                if (IsExpandable(item) && treeView.ShowExpandCollapse)
                {
                    WriteNodeExpander(treeView, item, writer);
                }

                if (IsCheckbox(treeView, item))
                {
                    WriteNodeCheckbox(treeView, item, writer);
                }
                else if (IsLink(item))
                {
                    WriteNodeLink(treeView, item, writer);
                }
                else
                {
                    WriteNodePlain(treeView, item, writer);
                }

                if (HasChildren(item))
                {
                    BuildItems(item.ChildNodes, false, item.Expanded.Equals(true), writer);
                }

                writer.Indent--;
                writer.WriteLine();
                writer.WriteEndTag("li");
            }
        }

        private void WriteNodeExpander(TreeView treeView, TreeNode item, HtmlTextWriter writer)
        {
            writer.WriteBeginTag("span");
            writer.WriteAttribute("class", (item.Expanded.Equals(true) ? "AspNet-TreeView-Collapse" : "AspNet-TreeView-Expand"));
            if (HasChildren(item))
            {
                writer.WriteAttribute("onclick", "ExpandCollapse__AspNetTreeView(this)");
            }
            else
            {
                writer.WriteAttribute("onclick", Page.ClientScript.GetPostBackEventReference(treeView, "p" + (Page.Server.HtmlEncode(item.ValuePath)).Replace("/", "\\"), true));
            }
            writer.Write(HtmlTextWriter.TagRightChar);
            writer.Write(" ");
            writer.WriteEndTag("span");
            writer.WriteLine();
        }

        private void WriteNodeImage(TreeView treeView, TreeNode item, HtmlTextWriter writer)
        {
            string imgSrc = GetImageSrc(treeView, item);
            if (!String.IsNullOrEmpty(imgSrc))
            {
                writer.WriteBeginTag("img");
                writer.WriteAttribute("src", treeView.ResolveClientUrl(imgSrc));
                writer.WriteAttribute("alt", !String.IsNullOrEmpty(item.ToolTip) ? item.ToolTip : (!String.IsNullOrEmpty(treeView.ToolTip) ? treeView.ToolTip : item.Text));
                writer.Write(HtmlTextWriter.SelfClosingTagEnd);
            }
        }

        private void WriteNodeCheckbox(TreeView treeView, TreeNode item, HtmlTextWriter writer)
        {
            writer.WriteBeginTag("input");
            writer.WriteAttribute("type", "checkbox");
            writer.WriteAttribute("id", treeView.ClientID + "n" + _checkboxIndex.ToString() + "CheckBox");
            writer.WriteAttribute("name", treeView.UniqueID + "n" + _checkboxIndex.ToString() + "CheckBox");

            if (!String.IsNullOrEmpty(treeView.Attributes["OnClientClickedCheckbox"]))
            {
                writer.WriteAttribute("onclick", treeView.Attributes["OnClientClickedCheckbox"]);
            }

            if (item.Checked)
            {
                writer.WriteAttribute("checked", "checked");
            }
            writer.Write(HtmlTextWriter.SelfClosingTagEnd);

            if (!String.IsNullOrEmpty(item.Text))
            {
                writer.WriteLine();
                writer.WriteBeginTag("label");
                writer.WriteAttribute("for", treeView.ClientID + "n" + _checkboxIndex.ToString() + "CheckBox");
                writer.Write(HtmlTextWriter.TagRightChar);
                writer.Write(item.Text);
                writer.WriteEndTag("label");
            }

            _checkboxIndex++;
        }


        private void WriteNodeLink(TreeView treeView, TreeNode item, HtmlTextWriter writer)
        {
            writer.WriteBeginTag("a");

            if (!String.IsNullOrEmpty(item.NavigateUrl))
            {
                writer.WriteAttribute("href", Extender.ResolveUrl(item.NavigateUrl));
            }
            else
            {
                string codePrefix = "";
                if (item.SelectAction == TreeNodeSelectAction.Select)
                {
                    codePrefix = "s";
                }
                else if (item.SelectAction == TreeNodeSelectAction.SelectExpand)
                {
                    codePrefix = "e";
                }
                else if (item.PopulateOnDemand)
                {
                    codePrefix = "p";
                }
                writer.WriteAttribute("href", Page.ClientScript.GetPostBackClientHyperlink(treeView, codePrefix + (Page.Server.HtmlEncode(item.ValuePath)).Replace("/", "\\"), true));
            }

            WebControlAdapterExtender.WriteTargetAttribute(writer, item.Target);

            if (!String.IsNullOrEmpty(item.ToolTip))
            {
                writer.WriteAttribute("title", item.ToolTip);
            }
            else if (!String.IsNullOrEmpty(treeView.ToolTip))
            {
                writer.WriteAttribute("title", treeView.ToolTip);
            }
            writer.Write(HtmlTextWriter.TagRightChar);
            writer.Indent++;
            writer.WriteLine();

            WriteNodeImage(treeView, item, writer);
            writer.Write(item.Text);

            writer.Indent--;
            writer.WriteEndTag("a");
        }

        private void WriteNodePlain(TreeView treeView, TreeNode item, HtmlTextWriter writer)
        {
            writer.WriteBeginTag("span");
            if (IsExpandable(item))
            {
                writer.WriteAttribute("class", "AspNet-TreeView-ClickableNonLink");
                if (treeView.ShowExpandCollapse)
                {
                    writer.WriteAttribute("onclick", "ExpandCollapse__AspNetTreeView(this.parentNode.getElementsByTagName('span')[0])");
                }
            }
            else
            {
                writer.WriteAttribute("class", "AspNet-TreeView-NonLink");
            }
            writer.Write(HtmlTextWriter.TagRightChar);
            writer.Indent++;
            writer.WriteLine();

            WriteNodeImage(treeView, item, writer);
            writer.Write(item.Text);

            writer.Indent--;
            writer.WriteEndTag("span");
        }

        private void UpdateCheckmarks(TreeNodeCollection items)
        {
            TreeView treeView = Control as TreeView;
            if ((treeView != null) && (items != null))
            {
                foreach (TreeNode item in items)
                {
                    if (IsCheckbox(treeView, item))
                    {
                        string name = treeView.UniqueID + "n" + _checkboxIndex.ToString() + "CheckBox";
                        bool bIsNowChecked = (Page.Request.Form[name] != null);
                        if (item.Checked != bIsNowChecked)
                        {
                            item.Checked = bIsNowChecked;
                            Extender.RaiseAdaptedEvent("TreeNodeCheckChanged", new TreeNodeEventArgs(item));
                        }
                        _checkboxIndex++;
                    }

                    if (HasChildren(item))
                    {
                        UpdateCheckmarks(item.ChildNodes);
                    }
                }
            }
        }

        private bool IsLink(TreeNode item)
        {
            return (item != null) && ((!String.IsNullOrEmpty(item.NavigateUrl)) || item.PopulateOnDemand || (item.SelectAction == TreeNodeSelectAction.Select) || (item.SelectAction == TreeNodeSelectAction.SelectExpand));
        }

        private bool IsCheckbox(TreeView treeView, TreeNode item)
        {
            bool bItemCheckBoxDisallowed = (item.ShowCheckBox != null) && (item.ShowCheckBox.Value == false);
            bool bItemCheckBoxWanted = (item.ShowCheckBox != null) && (item.ShowCheckBox.Value == true);
            bool bTreeCheckBoxWanted =
                 (treeView.ShowCheckBoxes == TreeNodeTypes.All) ||
                 ((treeView.ShowCheckBoxes == TreeNodeTypes.Leaf) && (!IsExpandable(item))) ||
                 ((treeView.ShowCheckBoxes == TreeNodeTypes.Parent) && (IsExpandable(item))) ||
                 ((treeView.ShowCheckBoxes == TreeNodeTypes.Root) && (item.Depth == 0));

            return (!bItemCheckBoxDisallowed) && (bItemCheckBoxWanted || bTreeCheckBoxWanted);
        }

        private string GetNodeClass(TreeNode item)
        {
            string value = "AspNet-TreeView-Leaf";
            if (item != null)
            {
                if (item.Depth == 0)
                {
                    if (IsExpandable(item))
                    {
                        value = "AspNet-TreeView-Root";
                    }
                    else
                    {
                        value = "AspNet-TreeView-Root AspNet-TreeView-Leaf";
                    }
                }
                else if (IsExpandable(item))
                {
                    value = "AspNet-TreeView-Parent";
                }

                if (item.Selected)
                {
                    value += " AspNet-TreeView-Selected";
                }
                else if (IsChildNodeSelected(item))
                {
                    value += " AspNet-TreeView-ChildSelected";
                }
                else if (IsParentNodeSelected(item))
                {
                    value += " AspNet-TreeView-ParentSelected";
                }
            }
            return value;
        }

        private string GetImageSrc(TreeView treeView, TreeNode item)
        {
            string imgSrc = "";

            if ((treeView != null) && (item != null))
            {
                imgSrc = item.ImageUrl;

                if (String.IsNullOrEmpty(imgSrc))
                {
                    if (item.Depth == 0)
                    {
                        if ((treeView.RootNodeStyle != null) && (!String.IsNullOrEmpty(treeView.RootNodeStyle.ImageUrl)))
                        {
                            imgSrc = treeView.RootNodeStyle.ImageUrl;
                        }
                    }
                    else
                    {
                        if (!IsExpandable(item))
                        {
                            if ((treeView.LeafNodeStyle != null) && (!String.IsNullOrEmpty(treeView.LeafNodeStyle.ImageUrl)))
                            {
                                imgSrc = treeView.LeafNodeStyle.ImageUrl;
                            }
                        }
                        else if ((treeView.ParentNodeStyle != null) && (!String.IsNullOrEmpty(treeView.ParentNodeStyle.ImageUrl)))
                        {
                            imgSrc = treeView.ParentNodeStyle.ImageUrl;
                        }
                    }
                }

                if ((String.IsNullOrEmpty(imgSrc)) && (treeView.LevelStyles != null) && (treeView.LevelStyles.Count > item.Depth))
                {
                    if (!String.IsNullOrEmpty(treeView.LevelStyles[item.Depth].ImageUrl))
                    {
                        imgSrc = treeView.LevelStyles[item.Depth].ImageUrl;
                    }
                }
            }

            return imgSrc;
        }

        private bool HasChildren(TreeNode item)
        {
            return ((item != null) && ((item.ChildNodes != null) && (item.ChildNodes.Count > 0)));
        }

        private bool IsExpandable(TreeNode item)
        {
            return (HasChildren(item) || ((item != null) && item.PopulateOnDemand));
        }

        private void ClearSelectedNode(TreeNodeCollection nodes)
        {
            if (nodes != null)
            {
                foreach (TreeNode node in nodes)
                {
                    if (node.Selected)
                    {
                        node.Selected = false;
                    }
                    if (node.ChildNodes != null)
                    {
                        ClearSelectedNode(node.ChildNodes);
                    }
                }
            }
        }

        private bool IsChildNodeSelected(TreeNode item)
        {
            bool bRet = false;

            if ((item != null) && (item.ChildNodes != null))
            {
                bRet = IsChildNodeSelected(item.ChildNodes);
            }

            return bRet;
        }

        private bool IsChildNodeSelected(TreeNodeCollection nodes)
        {
            bool bRet = false;

            if (nodes != null)
            {
                foreach (TreeNode node in nodes)
                {
                    if (node.Selected || IsChildNodeSelected(node.ChildNodes))
                    {
                        bRet = true;
                        break;
                    }
                }
            }

            return bRet;
        }

        private bool IsParentNodeSelected(TreeNode item)
        {
            bool bRet = false;

            if ((item != null) && (item.Parent != null))
            {
                if (item.Parent.Selected)
                {
                    bRet = true;
                }
                else
                {
                    bRet = IsParentNodeSelected(item.Parent);
                }
            }

            return bRet;
        }

        private string ComposeViewState(TreeNodeCollection nodes, string state)
        {
            if (nodes != null)
            {
                foreach (TreeNode node in nodes)
                {
                    if (IsExpandable(node))
                    {
                        if (node.Expanded.Equals(true))
                        {
                            state += "e";
                            state = ComposeViewState(node.ChildNodes, state);
                        }
                        else
                        {
                            state += "n";
                        }
                    }
                }
            }

            return state;
        }

        private string ExpandToState(TreeNodeCollection nodes, string state)
        {
            if ((nodes != null) && (!String.IsNullOrEmpty(state)))
            {
                foreach (TreeNode node in nodes)
                {
                    if (IsExpandable(node))
                    {
                        bool bExpand = (state[0] == 'e');
                        state = state.Substring(1);
                        if (bExpand)
                        {
                            node.Expand();
                            state = ExpandToState(node.ChildNodes, state);
                        }
                    }
                }
            }

            return state;
        }

        static public void ExpandToDepth(TreeNodeCollection nodes, int expandDepth)
        {
            if (nodes != null)
            {
                foreach (TreeNode node in nodes)
                {
                    if (node.Depth < expandDepth)
                    {
                        node.Expand();
                        ExpandToDepth(node.ChildNodes, expandDepth);
                    }
                }
            }
        }
    }
}