source: trunk/yao/share/antlr-2.7.7/lib/csharp/antlr.astframe/antlr.debug.misc/JTreeASTPanel.cs @ 1

using System;
//using System.Collections;
//using System.ComponentModel;
//using System.Drawing;
//using System.Data;
using System.Windows.Forms;

using AST = antlr.collections.AST;

namespace antlr.debug.misc
{
        /// <summary>
        /// Summary description for myJTreeASTPanel.
        /// </summary>
        public class JTreeASTPanel : System.Windows.Forms.UserControl
        {
                private System.Windows.Forms.TreeView tree;
                /// <summary> 
                /// Required designer variable.
                /// </summary>
                private System.ComponentModel.Container components = null;

                private JTreeASTPanel()
                {
                        // This call is required by the Windows.Forms Form Designer.
                        InitializeComponent();

                        // TODO: Add any initialization after the InitForm call

                }

                public JTreeASTPanel(TreeViewEventHandler afterSelectHandler, AST rootAST) : this()
                {
                        tree.AfterSelect += afterSelectHandler;
                        tree.BeforeExpand += new TreeViewCancelEventHandler(ASTTreeNode.tree_BeforeExpand);
                        tree.Nodes.Add(new ASTTreeNode(rootAST));
                }

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

                #region Component Designer generated code
                /// <summary> 
                /// Required method for Designer support - do not modify 
                /// the contents of this method with the code editor.
                /// </summary>
                private void InitializeComponent()
                {
                        this.tree = new System.Windows.Forms.TreeView();
                        this.SuspendLayout();
                        // 
                        // tree
                        // 
                        this.tree.Dock = System.Windows.Forms.DockStyle.Fill;
                        this.tree.ImageIndex = -1;
                        this.tree.ImeMode = System.Windows.Forms.ImeMode.NoControl;
                        this.tree.Location = new System.Drawing.Point(5, 5);
                        this.tree.Name = "tree";
                        this.tree.SelectedImageIndex = -1;
                        this.tree.Size = new System.Drawing.Size(140, 140);
                        this.tree.TabIndex = 0;
                        // 
                        // JTreeASTPanel
                        // 
                        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                                                                                                  this.tree});
                        this.DockPadding.All = 5;
                        this.Name = "JTreeASTPanel";
                        this.ResumeLayout(false);

                }
                #endregion

        }

        internal class ASTTreeNode : TreeNode
        {
                private  AST    ASTNode_;
                internal bool   IsAlreadyExpanded = false;

                public AST ASTNode
                {
                        get { return ASTNode_;  }
                        set { ASTNode_ = value; }
                }

                public ASTTreeNode(AST a)
                {
                        ASTNode_ = a;
                        this.Text = a.ToString();
                        this.Nodes.Add("Loading.....");
                }

                internal static void tree_BeforeExpand(object sender, TreeViewCancelEventArgs e)
                {
                        ASTTreeNode thisNode   = (ASTTreeNode)e.Node;
                        AST                     parentAST  = thisNode.ASTNode;
                        AST                     childAST;

                        if (!thisNode.IsAlreadyExpanded)
                        {
                                thisNode.Nodes.Clear();
                                childAST = parentAST.getFirstChild();
                                while (null != childAST)
                                {
                                        thisNode.Nodes.Add(new ASTTreeNode(childAST));
                                        childAST = childAST.getNextSibling();
                                }
                                thisNode.IsAlreadyExpanded = true;
                        }
                }

        }
}