TreeView 的派生類: TreeViewEx 實現 NodeShowToolTip、NodeDoubleClick 事件 (轉)

TreeView 的派生類: TreeViewEx 實現 NodeShowToolTip、NodeDoubleClick 事件 (轉)[@more@]

// to:playyuer@Microshaoft.com">playyuer@Microshaoft.com invent
//一個 TreeView 的派生類: TreeViewEx 實現 NodeShowToolTip、NodeDoubleClick 事件
//1.實現了 NodeShowToolT事件,結合鍵盤 Ctrl 鍵顯示及設定 ToolTipText
//2.實現了 NodeDoubleClick 事件,可在中只響應"葉子"節點
//3.點選 TreeView 空白處不選中任何節點
//Class1.cs
using System;
public class TreeViewEx : System..Forms.TreeView
{
 public event TreeViewExEventHandler NodeDoubleClick;
 public event TreeViewExEventHandler NodeShowToolTip;
 private void OnNodeDoubleClick(System.Windows.Forms.TreeNode xx)
 {
 if(this.NodeDoubleClick != null)
 {
 this.NodeDoubleClick(this,new TreeViewExEventArgs(xx));
 }
 }
 private void OnNodeShowToolTip(System.Windows.Forms.TreeNode xx, System.Windows.Forms.ToolTip yy)
 {
 if(this.NodeShowToolTip != null)
 {
 if ((xx != null) && (this.toolTip !=null))
 this.NodeShowToolTip(this,new TreeViewExEventArgs(xx,this.toolTip));
 }
 }
 protected overr void OnDoubleClick(System.EventArgs e)
 {
 if (this.edNode != null)
 this.OnNodeDoubleClick(this.SelectedNode);
 base.OnDoubleClick(e);
 }
 private System.Windows.Forms.ToolTip toolTip;
 public TreeViewEx()
 {
 toolTip = new System.Windows.Forms.ToolTip();
 this.toolTip.InitialDelay = 300;
 this.toolTip.ReshowDelay = 0;
 }
 protected override void OnClick (System.EventArgs e)
 {
 if (this.GetNodeAt(System.Windows.Forms.TreeView.MousePosition.X,System.Windows.Forms.TreeView.MousePosition.Y) == null)
 this.SelectedNode = null;
 base.OnClick(e);
 }
 protected override void OnMouseDown (System.Windows.Forms.MouseEventArgs e)
 {
 if (this.GetNodeAt(e.X,e.Y) == null)
 this.SelectedNode = null;
 base.OnMouseDown(e);

 }
 private System.Windows.Forms.TreeNode LastTreeNode;
 protected override void OnMouseMove (System.Windows.Forms.MouseEventArgs e)
 {
 this.Cursor = System.Windows.Forms.Cursors.Default ;
 System.Windows.Forms.TreeNode treeNode;
 treeNode = this.GetNodeAt(e.X,e.Y) ;
 if(treeNode != null)
 {
 if( (System.Windows.Forms.Control.ModifierKeys & System.Windows.Forms.Keys.Control) != 0)
 {
 this.Cursor = System.Windows.Forms.Cursors.Hand ;
 if(treeNode != LastTreeNode | LastTreeNode ==null )
 {
 LastTreeNode = treeNode;
 this.toolTip.Active = false;
 this.OnNodeShowToolTip(treeNode,this.toolTip);
 this.toolTip.Active = true;
 }
 }
 else
 {
 this.Cursor = System.Windows.Forms.Cursors.Default ;
 this.toolTip.Active = false;
 }
 }
 else
 {
 this.Cursor = System.Windows.Forms.Cursors.Default ;
 this.toolTip.Active = false;
 }
 base.OnMouseMove(e);
 }
}
public delegate void TreeViewExEventHandler( sender,TreeViewExEventArgs e);
public class TreeViewExEventArgs : System.EventArgs
{
 public TreeViewExEventArgs(System.Windows.Forms.TreeNode SelectedNode)
 {
 this.m_SelectedNode = SelectedNode;
 }
 public TreeViewExEventArgs(System.Windows.Forms.TreeNode Node,System.Windows.Forms.ToolTip NodeToolTip)
 {
 this.m_NodeToolTip = NodeToolTip;
 this.m_Node = Node;
 }
 public TreeViewExEventArgs(System.Windows.Forms.TreeNode Node,string ToolTipText)
 {
 this.m_ToolTipText = ToolTipText;
 }
 private string m_ToolTipText;
 private System.Windows.Forms.ToolTip m_NodeToolTip;
 private System.Windows.Forms.TreeNode m_SelectedNode;
 private System.Windows.Forms.TreeNode m_Node;
 public System.Windows.Forms.TreeNode SelectedNode
 {
 get
 {
 return this.m_SelectedNode;
 }
 }
 public string ToolTipText
 {
 get
 {
 return this.ToolTipText;
 }
 set{m_ToolTipText = value;}
 }
 public System.Windows.Forms.TreeNode Node
 {
 get
 {
 return this.m_Node;
 }
 }
 public System.Windows.Forms.ToolTip NodeToolTip
 {
 get
 {
 return this.m_NodeToolTip;
 }
 }
}
public class TreeNodeEx : System.Windows.Forms.TreeNode
{
 public int GetLevel()
 {
 int i = 0;
 System.Windows.Forms.TreeNode xx =this.Parent;
 while ((xx = xx.Parent) != null) i++;
 return i;
 }
}

//=================================================================
//呼叫示例
 private TreeViewEx treeViewEx1;
 private void Form1_Load(object sender, System.EventArgs e)
 {
 treeViewEx1 = new TreeViewEx();
 this.Controls.Add(treeViewEx1);
 treeViewEx1.HideSelection=false;
 treeViewEx1.NodeDoubleClick +=new TreeViewExEventHandler(treeViewEx1_NodeDoubleClick);
 treeViewEx1.NodeShowToolTip += new TreeViewExEventHandler(this.treeViewEx1_NodeShowToolTip);
 treeViewEx1.Nodes.AddRange(new System.Windows.Forms.TreeNode[]{
  new System.Windows.Forms.TreeNode("",
  new System.Windows.Forms.TreeNode[]
{new System.Windows.Forms.TreeNode("a"),new System.Windows.Forms.TreeNode("b")}
  ),
  new System.Windows.Forms.TreeNode("Root1",
  new System.Windows.Forms.TreeNode[]
{new System.Windows.Forms.TreeNode("a1"),new System.Windows.Forms.TreeNode("b1")}
  )
  }
 );
 }

 public void treeViewEx1_NodeShowToolTip (object sender,TreeViewExEventArgs e)
 {
 e.NodeToolTip.SetToolTip (this.treeViewEx1,"[" + e.Node.Text + "]{" );
 }

 private void treeViewEx1_NodeDoubleClick(object sender, TreeViewExEventArgs e)
 {
 if (e.SelectedNode.GetNodeCount(true)==0 )
 System.Windows.Forms.MessageBox.Show(e.SelectedNode.Text);
 }