118 lines
3.6 KiB
C#
118 lines
3.6 KiB
C#
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using System;
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using System.Data;
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using System.Configuration;
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using System.Collections;
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using System.Collections.Generic;
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using System.Web;
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using System.Web.Security;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.WebControls.WebParts;
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using System.Web.UI.HtmlControls;
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using System.Text;
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namespace ScrewTurn.Wiki {
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public partial class ClientTree : System.Web.UI.UserControl {
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private const string ClientTreeItems = "ClientTreeItems";
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private string leafCssClass = "";
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private string nodeCssClass = "";
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private string containerCssClass = "";
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protected void Page_Load(object sender, EventArgs e) {
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Render();
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}
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/// <summary>
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/// Removes all the items in the tree and re-populates it.
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/// </summary>
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public void PopulateTree() {
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// Use ViewState to cache data
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if(Populate == null) ViewState[ClientTreeItems] = new List<TreeElement>();
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else ViewState[ClientTreeItems] = Populate(this, new PopulateEventArgs());
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Render();
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}
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private void Render() {
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List<TreeElement> items = (List<TreeElement>)ViewState[ClientTreeItems];
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if(items == null) return;
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StringBuilder sb = new StringBuilder();
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sb.Append(@"<div class=""treecontainer"">");
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int iteration = 0;
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RenderSubTree(items, sb, ref iteration);
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sb.Append("</div>");
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lblContent.Text = sb.ToString();
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}
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private void RenderSubTree(List<TreeElement> items, StringBuilder sb, ref int iteration) {
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// This method generates the client markup and JavaScript that contains a tree of items
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// The sub-trees are rendered as nested elements (DIVs)
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foreach(TreeElement item in items) {
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iteration++; // Before invoking RenderSubTree recursively!
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// Render item
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if(item.SubItems.Count > 0) {
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// Expanding link
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string containerId = BuildSubTreeContainerID(iteration);
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sb.AppendFormat(@"<a href=""#"" class=""{0}"" onclick=""javascript:return ToggleDiv('{1}');"" title=""{2}"">{3}</a>",
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nodeCssClass, containerId, item.Name, item.Text);
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sb.AppendFormat(@"<div id=""{0}"" class=""{1}"" style=""display: none;"">", containerId, containerCssClass);
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RenderSubTree(item.SubItems, sb, ref iteration);
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sb.Append("</div>");
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}
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else {
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// Action link
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sb.AppendFormat(@"<a href=""#"" class=""{0}"" onclick=""{1}"" title=""{2}"">{3}</a>",
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leafCssClass, item.OnClientClick, item.Name, item.Text);
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}
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}
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}
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private string BuildSubTreeContainerID(int iteration) {
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return string.Format("sub_{0}_{1}", ID, iteration);
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}
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/// <summary>
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/// Gets or sets the CSS Class for leaf items.
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/// </summary>
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public string LeafCssClass {
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get { return leafCssClass; }
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set { leafCssClass = value; }
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}
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/// <summary>
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/// Gets or sets the CSS Class for folder items.
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/// </summary>
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public string NodeCssClass {
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get { return nodeCssClass; }
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set { nodeCssClass = value; }
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}
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/// <summary>
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/// Gets or sets the CSS Class for containers.
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/// </summary>
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public string ContainerCssClass {
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get { return containerCssClass; }
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set { containerCssClass = value; }
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}
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/// <summary>
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/// Delegate used for handling the Populate event.
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/// </summary>
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/// <param name="sender">The object that fired the event.</param>
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/// <param name="e">The event arguments.</param>
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/// <returns>A list of items contained in the expanded sub-tree.</returns>
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public delegate List<TreeElement> PopulateEventHandler(object sender, PopulateEventArgs e);
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/// <summary>
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/// Occurs when a sub-tree is populated.
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/// </summary>
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public event PopulateEventHandler Populate;
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}
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}
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