猛跑小猪
using System;using System.ComponentModel;using System.Drawing;using System.Windows.Forms;namespace UserControls{/// <summary>/// TreeViewComboBox 的摘要说明。/// </summary>public class TreeViewComboBox : UserControl{/// <summary>/// 必需的设计器变量。/// </summary>private Container components = null;public delegate void EventHandle(TreeNode n);public event EventHandle AfterSelectedNode;private bool _allowSelectParentNode = false;public TreeViewComboBox(){this.InitializeComponent();// Initializing Controlsthis.pnlBack = new Panel();this.pnlBack.BorderStyle = BorderStyle.Fixed3D;this.pnlBack.BackColor = Color.White;this.pnlBack.AutoScroll = false;this.tbSelectedValue = new TextBox();this.tbSelectedValue.BorderStyle = BorderStyle.None;this.tbSelectedValue.ReadOnlyChanged += new EventHandler(tbSelectedValue_ReadOnlyChanged);this.btnSelect = new ButtonEx();this.btnSelect.Click += new EventHandler(ToggleTreeView);this.btnSelect.FlatStyle = FlatStyle.Flat;this.lblSizingGrip = new LabelEx();this.lblSizingGrip.Size = new Size(9,9);this.lblSizingGrip.BackColor = Color.Transparent;this.lblSizingGrip.Cursor = Cursors.SizeNWSE;this.lblSizingGrip.MouseMove += new MouseEventHandler(SizingGripMouseMove);this.lblSizingGrip.MouseDown += new MouseEventHandler(SizingGripMouseDown);this.tvTreeView = new TreeView();this.tvTreeView.BorderStyle = BorderStyle.None;this.tvTreeView.DoubleClick += new EventHandler(TreeViewNodeSelect);this.tvTreeView.Location = new Point(0,0);this.tvTreeView.LostFocus += new EventHandler(TreeViewLostFocus);//this.tvTreeView.Scrollable = false;this.frmTreeView = new Form();this.frmTreeView.FormBorderStyle = FormBorderStyle.None;this.frmTreeView.BringToFront();this.frmTreeView.StartPosition = FormStartPosition.Manual;this.frmTreeView.ShowInTaskbar = false;this.frmTreeView.BackColor = SystemColors.Control;this.pnlTree = new Panel();this.pnlTree.BorderStyle = BorderStyle.FixedSingle;this.pnlTree.BackColor = Color.White;SetStyle(ControlStyles.DoubleBuffer,true);SetStyle(ControlStyles.ResizeRedraw,true);// Adding Controls to UserControlthis.pnlTree.Controls.Add(this.lblSizingGrip);this.pnlTree.Controls.Add(this.tvTreeView);this.frmTreeView.Controls.Add(this.pnlTree);this.pnlBack.Controls.AddRange(new Control[]{btnSelect, tbSelectedValue});this.Controls.Add(this.pnlBack);}/// <summary>/// 清理所有正在使用的资源。/// </summary>protected override void Dispose( bool disposing ){if( disposing ){if(components != null){components.Dispose();}}base.Dispose( disposing );}#region 组件设计器生成的代码/// <summary>/// 设计器支持所需的方法 - 不要使用代码编辑器/// 修改此方法的内容。/// </summary>private void InitializeComponent(){//// ComboBoxTree//this.Name = "ComboBoxTree";// this._absoluteChildrenSelectableOnly = true;this.Layout += new LayoutEventHandler(this.ComboBoxTree_Layout);}#endregion#region Private 属性private Panel pnlBack;private Panel pnlTree;private TextBox tbSelectedValue;private ButtonEx btnSelect;private TreeView tvTreeView;private LabelEx lblSizingGrip;private Form frmTreeView;// private string _branchSeparator;// private bool _absoluteChildrenSelectableOnly;private Point DragOffset;#endregion#region Public 属性/// <summary>/// 是否允许选择非叶子节点/// </summary>public bool AllowSelectParentNode{set{_allowSelectParentNode = value;}get{return _allowSelectParentNode;}}public Color TextForeColor{set { this.tbSelectedValue.ForeColor = value; }}public Color TextBackColor{set { this.tbSelectedValue.BackColor = value; }}/// <summary>/// 文本只读属性/// </summary>public bool TextReadOnly{set { this.tbSelectedValue.ReadOnly = value; }}/// <summary>/// 树节点集合/// </summary>public TreeNodeCollection Nodes{get{return this.tvTreeView.Nodes;}}/// <summary>/// 选中的节点/// </summary>public TreeNode SelectedNode{set{this.tvTreeView.SelectedNode = value;}get{return this.tvTreeView.SelectedNode;}}/// <summary>/// ImageList/// </summary>public ImageList Imagelist{get {return this.tvTreeView.ImageList;}set {this.tvTreeView.ImageList = value;}}/// <summary>/// 显示选中的值/// </summary>public override string Text{get {return this.tbSelectedValue.Text;}set {this.tbSelectedValue.Text = value;}}// /// <summary>// /// 显示完整树节点路径时，路经的分隔符（1位字符）// /// </summary>// public string BranchSeparator// {// get {return this._branchSeparator;}// set// {// if(value.Length > 0)// this._branchSeparator = value.Substring(0,1);// }// }//// /// <summary>// /// 是否是叶子节点// /// </summary>// public bool AbsoluteChildrenSelectableOnly// {// get {return this._absoluteChildrenSelectableOnly;}// set {this._absoluteChildrenSelectableOnly = value;}// }#endregion/// <summary>/// 拖动树背景，改变背景大小/// </summary>private void RelocateGrip(){this.lblSizingGrip.Top = this.frmTreeView.Height - lblSizingGrip.Height - 1;this.lblSizingGrip.Left = this.frmTreeView.Width - lblSizingGrip.Width - 1;}/// <summary>/// 点击三角按钮，显示树Form/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void ToggleTreeView(object sender, EventArgs e){if(!this.frmTreeView.Visible){Rectangle CBRect = this.RectangleToScreen(this.ClientRectangle);this.frmTreeView.Location = new Point(CBRect.X, CBRect.Y + this.pnlBack.Height);this.tvTreeView.Nodes[0].Expand();this.frmTreeView.Show();this.frmTreeView.BringToFront();this.RelocateGrip();//this.tbSelectedValue.Text = "";}else{this.frmTreeView.Hide();}}/// <summary>/// 验证选中的是否是叶子节点/// </summary>/// <returns></returns>// public bool ValidateText()// {// string ValidatorText = this.Text;// TreeNodeCollection TNC = this.tvTreeView.Nodes;//// for(int i = 0; i < ValidatorText.Split(this._branchSeparator.ToCharArray()[0]).Length; i++)// {// bool NodeFound = false;// string NodeToFind = ValidatorText.Split(this._branchSeparator.ToCharArray()[0])[i];// for(int j = 0; j < TNC.Count; j++)// {// if(TNC[j].Text == NodeToFind)// {// NodeFound = true;// TNC = TNC[j].Nodes;// break;// }// }//// if(!NodeFound)// return false;// }//// return true;// }#region 事件/// <summary>/// 改变背景大小，在鼠标移动时发生/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void SizingGripMouseMove(object sender, MouseEventArgs e){if(e.Button == MouseButtons.Left){int TvWidth, TvHeight;TvWidth = Cursor.Position.X - this.frmTreeView.Location.X;TvWidth = TvWidth + this.DragOffset.X;TvHeight = Cursor.Position.Y - this.frmTreeView.Location.Y;TvHeight = TvHeight + this.DragOffset.Y;if(TvWidth < 50)TvWidth = 50;if(TvHeight < 50)TvHeight = 50;this.frmTreeView.Size = new Size(TvWidth, TvHeight);this.pnlTree.Size = this.frmTreeView.Size;this.tvTreeView.Size = new Size(this.frmTreeView.Size.Width - this.lblSizingGrip.Width, this.frmTreeView.Size.Height - this.lblSizingGrip.Width);;RelocateGrip();}}/// <summary>/// 改变背景大小，在按下鼠标时发生/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void SizingGripMouseDown(object sender, MouseEventArgs e){if(e.Button == MouseButtons.Left){int OffsetX = Math.Abs(Cursor.Position.X - this.frmTreeView.RectangleToScreen(this.frmTreeView.ClientRectangle).Right);int OffsetY = Math.Abs(Cursor.Position.Y - this.frmTreeView.RectangleToScreen(this.frmTreeView.ClientRectangle).Bottom);this.DragOffset = new Point(OffsetX, OffsetY);}}/// <summary>/// 树型控件失去焦点/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void TreeViewLostFocus(object sender, EventArgs e){if(!this.btnSelect.RectangleToScreen(this.btnSelect.ClientRectangle).Contains(Cursor.Position))this.frmTreeView.Hide();}/// <summary>/// 选中树型空间节点/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void TreeViewNodeSelect(object sender, EventArgs e){if(this._allowSelectParentNode && this.tvTreeView.SelectedNode != this.tvTreeView.Nodes[0]){this.tbSelectedValue.Text = this.tvTreeView.SelectedNode.Text;this.ToggleTreeView(sender,null);AfterSelectedNode(this.tvTreeView.SelectedNode);}else{if(this.tvTreeView.SelectedNode.Nodes.Count == 0){this.tbSelectedValue.Text = this.tvTreeView.SelectedNode.Text;this.ToggleTreeView(sender,null);AfterSelectedNode(this.tvTreeView.SelectedNode);}}}private void ComboBoxTree_Layout(object sender, LayoutEventArgs e){this.Height = this.tbSelectedValue.Height + 8;this.pnlBack.Size = new Size(this.Width, this.Height - 2);this.btnSelect.Size = new Size(16, this.Height - 6);this.btnSelect.Location = new Point(this.Width - this.btnSelect.Width - 4, 0);this.tbSelectedValue.Location = new Point(2, 2);this.tbSelectedValue.Width = this.Width - this.btnSelect.Width - 4;this.frmTreeView.Size = new Size(this.Width + 60, 250);this.pnlTree.Size = this.frmTreeView.Size;this.tvTreeView.Width = this.frmTreeView.Width - this.lblSizingGrip.Width;this.tvTreeView.Height = this.frmTreeView.Height - this.lblSizingGrip.Width;this.RelocateGrip();}/// <summary>/// 文本只读事件/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void tbSelectedValue_ReadOnlyChanged(object sender, EventArgs e){if(this.tbSelectedValue.ReadOnly){this.tbSelectedValue.BackColor = Color.White;}}#endregion#region 树型背景Labelprivate class LabelEx : Label{/// <summary>////// </summary>public LabelEx(){this.SetStyle(ControlStyles.UserPaint,true);this.SetStyle(ControlStyles.DoubleBuffer,true);this.SetStyle(ControlStyles.AllPaintingInWmPaint,true);}/// <summary>////// </summary>/// <param name="e"></param>protected override void OnPaint(PaintEventArgs e){base.OnPaint(e);ControlPaint.DrawSizeGrip(e.Graphics,Color.Black, 1, 0, this.Size.Width, this.Size.Height);}}#endregion#region 三角形按钮private class ButtonEx : Button{ButtonState state;/// <summary>////// </summary>public ButtonEx(){this.SetStyle(ControlStyles.UserPaint,true);this.SetStyle(ControlStyles.DoubleBuffer,true);this.SetStyle(ControlStyles.AllPaintingInWmPaint,true);}/// <summary>////// </summary>/// <param name="e"></param>protected override void OnMouseDown(MouseEventArgs e){state = ButtonState.Pushed;base.OnMouseDown(e);}/// <summary>////// </summary>/// <param name="e"></param>protected override void OnMouseUp(MouseEventArgs e){state = ButtonState.Normal;base.OnMouseUp(e);}/// <summary>////// </summary>/// <param name="e"></param>protected override void OnPaint(PaintEventArgs e){base.OnPaint(e);ControlPaint.DrawComboButton(e.Graphics, 0, 0, this.Width, this.Height, state);}}#endregion}}