// [email protected] invent //一个 TreeView 的派生类: TreeViewEx 实现 NodeShowToolTip、NodeDoubleClick 事件 //1.实现了 NodeShowToolTip 事件,结合键盘 Ctrl 键显示及设置 ToolTipText //2.实现了 NodeDoubleClick 事件,可在调用中只响应"叶子"节点 //3.点击 TreeView 空白处不选中任何节点 //Class1.cs using System; public class TreeViewEx : System.Windows.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 override void OnDoubleClick(System.EventArgs e) { if (this.SelectedNode != 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(object 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; } }
//================================================================= //调用示例 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("Root", 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); } 
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