csharp:DropDownComboxTreeView

using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Drawing; 
using System.Resources; 
using System.ComponentModel; 
using System.Windows.Forms; 
  
namespace CustomControls 
{ 
  
  
    /// <summary> 
    /// 涂聚文 2014-06-30 修改
    /// DropDownTreeView class offers TreeView that is desined to act under a drop down control 
    /// You can use this control when you need to select a value from a dynamic TreeView.    
    /// The sub controls of this control are set to protected. You can override the control 
    /// to assign values to the subcontrol of change their behaviour.    
    /// http://www.codeproject.com/Articles/3994/Custom-ComboBoxes-with-Advanced-Drop-down-Features 
    /// </summary> 
    public class DropDownComboxTreeView : UserControl 
    { 
        /// <summary> 
        /// protected Button control, this is the control's toggle button 
        /// </summary> 
        protected ButtonEx btnSelect; 
        /// <summary> 
        /// protected TextBox control, this is control's value TextBox. 
        /// The TextBox's ReadyOnly false is by default set ti true 
        /// </summary> 
        protected ComboBox useComboxBox; 
        /// <summary> 
        /// protected TreeView control, this is the control's TreeView. 
        /// </summary> 
        protected TreeView treeView; 
  
        /// <summary> 
        /// protected value that is set to true of false within the 
        ///  SetTextValueToSelectedNode method. 
        /// </summary> 
        protected bool TextValueSet=false; 
  
        /// <summary> 
        /// the resize label on the Control's TreeView control 
        /// </summary> 
        private LabelEx treeLabel; 
  
        /// <summary> 
        /// This is the margin in pixels for resizing the TreeView 
        /// </summary> 
        private int Margin = 10; 
  
        /// <summary> 
        /// TreeView's minimum width 
        /// </summary> 
        private int tvMinWidth = 0; 
  
        /// <summary> 
        /// TreeView's minimum height 
        /// </summary> 
        private int tvMinHeight = 150; 
  
        //private ComboBox.ObjectCollection itm; 
  
        /// <summary> 
        /// General point to access MouseMove event for resizing the TreeView 
        /// </summary> 
        private MouseEventArgs parentMouse; 
  
       // ComboboxItem item = null; 
  
        //private string _Text; 
  
        //        public string ComboxText 
        //        { 
        //            get { return _Text; } 
        //            set { _Text = value; } 
        //        } 
        //private string _Value; 
  
        //        public string ComboxValue 
        //        { 
        //            get { return _Value; } 
        //            set { _Value = value; } 
        //        } 
        
        /// <summary> 
        /// Get TreeNodeCollection collection, Herewith you can add and remove items to the treeview 
        /// </summary> 
        [ 
            Description("Gets the TreeView Nodes collection"), 
            Category("TreeView") 
        ] 
        public TreeNodeCollection Nodes 
        { 
            get
            { 
                return treeView.Nodes; 
            } 
        } 
  
        /// <summary> 
        /// Get,set property that provides the TreeView's Selected Node 
        /// </summary> 
        [ 
            Description("Gets or sets the TreeView's Selected Node"), 
            Category("TreeView") 
        ] 
        public TreeNode SelectedNode 
        { 
            get
            { 
                return treeView.SelectedNode; 
            } 
            set
            { 
                treeView.SelectedNode = value; 
            } 
        } 
  
        /// <summary> 
        /// Get, set property of boolean type, this property is mapped to the ReadOnly property of the control's TextBox 
        /// </summary> 
        [ 
            Description("Gets or sets the ComboBox's Enabled state"), 
            Category("ComboBox") 
        ] 
        public bool ComboBoxReadOnly 
        { 
            set
            { 
                useComboxBox.Enabled = value; 
            } 
            get
            { 
                return useComboxBox.Enabled; 
            } 
        } 
  
        //[ 
        //    Description("Gets or sets the ComboBox's text state"), 
        //    Category("ComboBox") 
        //] 
        //public ComboboxItem Items 
        //{ 
        //    get 
        //    { 
        //        return object; //txtValue.Items 
        //    } 
        //    set 
        //    { 
        //        txtValue.SelectedItem = value; 
        //    } 
        //} 
        /// <summary> 
        ///  
        /// </summary> 
        //public List<UserCombox> 
        //{ 
        //   List<UserCombox> collection=new List<UserCombox>; 
                              
             
        //} 
        //public UserCombox Items 
        //{ 
        //    get { } 
        //    set { } 
        //} 
  
        //[ 
        //    Description("Gets or sets the ComboBox's text state"), 
        //    Category("ComboBox") 
        //] 
        public ComboBox.ObjectCollection Items  
        { 
           //ComboBox.ObjectCollection  items= new ComboBox.ObjectCollection(txtValue);  
  
            set
            { 
                for (int i = 0; i < value.Count; i++) 
                { 
                    useComboxBox.Items.Add(value[i]); 
                } 
            } 
  
            get
            { 
                //if (Items.Count > 0) 
                //{ 
                //    txtValue.Items.Add(Items); 
                //} 
                return this.useComboxBox.Items; 
            } 
        } 
        [ 
            Description("Gets the ComboxBox DataSource"), 
            Category("ComboBox") 
        ] 
        public Object DataSource  
        {          
            set
            {  
                useComboxBox.DataSource = value;  //要先的关系 
            }  
            get
            {  
                return useComboxBox.DataSource;  
            } 
    
        } 
        [ 
            Description("Gets the ComboxBox DataSource DisplayMember"), 
            Category("ComboBox") 
        ] 
        public string DisplayMember  
        { 
            set
            { 
                useComboxBox.DisplayMember = value; 
            } 
            get
            { 
                return useComboxBox.DisplayMember; 
            }  
        } 
        [ 
            Description("Gets the ComboxBox DataSource ValueMember"), 
            Category("ComboBox") 
        ] 
        public string ValueMember 
        { 
            set
            { 
                useComboxBox.ValueMember = value; 
            } 
            get
            { 
                return useComboxBox.ValueMember; 
            }  
        } 
  
  //      public static void SetLookupBinding(ListControl toBind, 
  //object dataSource, string displayMember, 
  //string valueMember) 
  //      { 
  //          toBind.DisplayMember = displayMember; 
  //          toBind.ValueMember = valueMember; 
  
  //          // Only after the following line will the listbox  
  //          // receive events due to binding. 
  //          toBind.DataSource = dataSource; 
  //      } 
  
        /// <summary> 
        /// Get, set property thai is mapped to the Control's treeView control's ImageList property. 
        /// </summary> 
        public ImageList Imagelist 
        { 
            get
            { 
                return treeView.ImageList; 
            } 
            set
            { 
                treeView.ImageList = value; 
            } 
        } 
        /// <summary> 
        /// Control's constuctor 
        /// </summary> 
        public DropDownComboxTreeView() 
        { 
            //item=new ComboboxItem(); 
            //item.Text = "";// CustomControls.CustComboboxItem.ComboxText; 
            //item.Value = "";// CustomControls.CustComboboxItem.ComboxValue; 
            // General 
            TextValueSet = false; 
  
            // Initializing Controls 
            InitControls(); 
  
            // Setting The locations 
            SetSizeAndLocation(); 
  
            // Adding Controls to UserControl 
            this.Controls.AddRange(new Control[] { btnSelect, useComboxBox, treeView }); 
  
            // attaching events 
            this.Resize += new EventHandler(ControlResize); 
            this.LocationChanged += new EventHandler(ControlResize); 
  
        } 
  
        /// <summary> 
        /// Control's resize handler, this handler is attached to the controls Resize and LocationChanged events 
        /// </summary> 
        /// <param name="sender">sender obcject</param> 
        /// <param name="e">default EventArgs</param> 
        private void ControlResize(object sender, EventArgs e) 
        { 
            // Setting The locations 
            SetSizeAndLocation(); 
        } 
  
  
        /// <summary> 
        /// Controls, sub control initializer, private void that handles the control initialization. 
        /// </summary> 
        public void InitControls() 
        { 
            try
            { 
                //value box settings; 
                useComboxBox = new ComboBox(); 
                this.ComboBoxReadOnly = true; 
                useComboxBox.DropDownStyle = System.Windows.Forms.ComboBoxStyle.Simple; 
                //初始化的值 
                //if (TextValueSet == false) 
                //{ 
                //    ComboboxItem item = new ComboboxItem(); 
                //    ////txtValue.Text = this.SelectedNode.Text; //设定的值 
                //    item.Text = CustComboboxItem.ComboxText; 
                //    item.Value = CustComboboxItem.ComboxValue; 
                //if (!object.Equals(item, null)) 
                //{ 
                //    txtValue.Items.Add(item); 
                //    txtValue.SelectedIndex = 0; 
                //} 
  
                //} 
                //txtValue.Text = "gee"; 
                //txtValue.Text = ""; 
                //txtValue.Items.Add(SelecItem); 
                if (TextValueSet == false) 
                { 
                    useComboxBox.DataSource = DataSource; 
                    useComboxBox.DisplayMember = DisplayMember; 
                    useComboxBox.ValueMember = ValueMember; 
                } 
                else
                { 
                    useComboxBox.DataSource = null; 
                } 
  
                useComboxBox.Size = new System.Drawing.Size(121, 18); 
                //select button settings 
                btnSelect = new ButtonEx(); 
                //btnSelect.Font = new Font("System",7); 
                //btnSelect.Text = "+"; 
                //btnSelect.TextAlign = ContentAlignment.MiddleCenter; 
                //btnSelect.ClientSize = btnSelect.Size; 
                btnSelect.Click += new EventHandler(ToggleTreeView); 
                //btnSelect.Size = new Size(120,txtValue.Height); 
  
  
                treeView = new TreeView(); 
                treeView.BorderStyle = BorderStyle.FixedSingle; 
                treeView.Visible = false; 
                treeView.AfterSelect += new TreeViewEventHandler(TreeViewNodeSelect); 
                treeView.DoubleClick += new EventHandler(TreeViewNodeDoubleClickSelect); //双击为选择 
                treeView.MouseMove += new MouseEventHandler(TreeViewMouseMoveEventHandler); 
                treeView.Size = new Size(tvMinWidth, tvMinHeight); 
                treeLabel = new LabelEx(); 
                treeLabel.Size = new Size(16, 16); 
                treeLabel.BackColor = Color.Transparent; 
                treeView.Controls.Add(treeLabel); 
                SetHotSpot(); 
  
                this.SetStyle(ControlStyles.DoubleBuffer, true); 
                this.SetStyle(ControlStyles.ResizeRedraw, true); 
            } 
            catch (Exception ex) 
            { 
                ex.Message.ToString(); 
            } 
        } 
  
  
        /// <summary> 
        /// private void for setting the HotSpot helper label. 
        /// </summary> 
        private void SetHotSpot() 
        { 
            treeLabel.Top = treeView.Height - treeLabel.Height; 
            treeLabel.Left = treeView.Width - treeLabel.Width; 
        } 
  
        /// <summary> 
        /// TreeView node select handler, this is a protected event method  
        /// that is attached to the TreeView's AfterSelect event. It sets the  
        /// TextBox's Text property. By default It checks the selected treenode,  
        /// If the treenode dosn't have any child node then, this node's value  
        /// is assigned to the TextBox's Text Property.  
        /// You can implement your own AfterSelect handler by overriding this method. 
        /// </summary> 
        /// <param name="sender">sender object</param> 
        /// <param name="e">default TreeViewEventArgs</param> 
        protected void TreeViewNodeSelect(object sender, TreeViewEventArgs e) 
        { 
            // chiching for none root node 
            if (this.SelectedNode.Nodes.Count == 0) //选择确定 
            { 
                SetTextValueToSelectedNode(); 
                TextValueSet = true; 
            } 
        } 
  
  
        /// <summary> 
        /// This event method is the control's TreeView's DoubleClick event handler. 
        /// It is meant to close the TreeView when an item is DoubleClicked. 
        /// This function calls the TreeViewNodeSelect event handler method, then if  
        /// the TextValueSet is set to true it toggles (closes) the TreeView 
        /// </summary> 
        /// <param name="sender"></param> 
        /// <param name="e"></param> 
        private void TreeViewNodeDoubleClickSelect(object sender, EventArgs e) 
        { 
            this.TreeViewNodeSelect(sender, null); 
            if (TextValueSet) 
            { 
                this.ToggleTreeView(sender, null); 
            } 
        } 
        /// <summary> 
        /// private void setting the control's TextBox's Text property. 
        /// This method also sets the TextValueSet to true if a value  
        /// is assigned to the TextBox's Text property 
        /// </summary> 
        private void SetTextValueToSelectedNode() 
        { 
            try
            { 
                //useComboxBox.Items.Clear(); 
                useComboxBox.DataSource = null; 
                ComboboxItem item = new ComboboxItem(); 
                //txtValue.Text = this.SelectedNode.Text; //设定的值 
                item.Text = this.SelectedNode.Text; 
                item.Value = this.SelectedNode.Name; 
                useComboxBox.Items.Clear(); 
                useComboxBox.Items.Add(item); 
                useComboxBox.SelectedIndex = 0; 
                TextValueSet = true; 
            } 
            catch(Exception ex) 
            { 
                ex.Message.ToString(); 
                TextValueSet = false; 
            } 
        } 
  
        /// <summary> 
        /// private event method, this method is attached to the control's Button's Clcick event. 
        /// It handles the show/hide of the control's treeview 
        /// </summary> 
        /// <param name="sender">sender object</param> 
        /// <param name="e">default EventArgs</param> 
        private void ToggleTreeView(object sender, EventArgs e) 
        { 
            if (!treeView.Visible) 
            { 
  
                SetTreeViewSizeAndLocation(); 
                try
                { 
                    this.btnSelect.Text = "-"; 
                    this.Parent.Controls.Add(treeView); 
                    this.treeView.BringToFront(); 
                    treeView.Visible = true; 
                    treeView.Select(); 
                    Parent.MouseMove += new MouseEventHandler(ParentMouseMoveHandler); 
                    if (treeView.Width < this.Width || treeView.Height < this.Height) 
                    { 
                        treeView.Width = tvMinWidth; 
                        treeView.Height = 150; 
                        SetHotSpot(); 
                    } 
  
                } 
                catch
                { 
                } 
            } 
            else
            { 
                try
                { 
                    btnSelect.Text = "+"; 
                    treeView.Visible = false; 
                    this.Parent.Controls.Remove(treeView); 
                    Parent.MouseMove -= new MouseEventHandler(ParentMouseMoveHandler); 
                } 
                catch
                { 
                } 
            } 
        } 
        /// <summary> 
        ///  
        /// </summary> 
        /// <param name="sender"></param> 
        /// <param name="e"></param> 
        private void TreeViewMouseMoveEventHandler(object sender, MouseEventArgs e) 
        { 
            this.parentMouse = e; 
            SetCursor(Cursors.Default); 
        } 
        /// <summary> 
        ///  
        /// </summary> 
        /// <param name="sender"></param> 
        /// <param name="e"></param> 
        private void ParentMouseMoveHandler(object sender, MouseEventArgs e) 
        { 
            int tx, ty; 
            this.parentMouse = e; 
  
            tx = treeView.Left + treeView.Width; 
            ty = treeView.Top + treeView.Height; 
  
            SetHotSpot(); 
  
            if (e.Button == MouseButtons.Left) 
            { 
                Margin = 50; 
                treeLabel.BringToFront(); 
            } 
            else
            { 
                Margin = 4; 
            } 
  
            if ((is_in_range(e.Y, ty - Margin, ty + Margin)) && is_in_range(e.X, tx - Margin, tx + Margin)) 
            { 
                SetCursor(Cursors.SizeNWSE); 
                if (e.Button == MouseButtons.Left) 
                { 
                    treeView.Height = e.Y - treeView.Top; 
                    treeView.Width = e.X - treeView.Left; 
                } 
            } 
            else
            { 
                SetCursor(Cursors.Default); 
            } 
        } 
        /// <summary> 
        ///  
        /// </summary> 
        /// <param name="crs"></param> 
        private void SetCursor(Cursor crs) 
        { 
            treeView.Cursor = crs; 
            Parent.Cursor = crs; 
        } 
        /// <summary> 
        ///  
        /// </summary> 
        /// <param name="rvalue"></param> 
        /// <param name="start"></param> 
        /// <param name="end"></param> 
        /// <returns></returns> 
        private bool is_in_range(int rvalue, int start, int end) 
        { 
            if ((rvalue >= start) && (rvalue <= end)) 
            { 
                return true; 
            } 
            else
            { 
                return false; 
            } 
        } 
  
        /// <summary> 
        ///  
        /// </summary> 
        public void SetTreeViewMinimumSize() 
        { 
            if ((treeView.Width < this.Width) || (treeView.Height < 150)) 
            { 
                treeView.Width = this.Width; 
                treeView.Height = 150; 
            } 
        } 
  
        /// <summary> 
        /// private method sets the control's TreeView's size and location. 
        /// It is called when the control is resized to moved from it's place 
        /// </summary> 
        private void SetTreeViewSizeAndLocation() 
        { 
            if (treeView != null) 
            { 
                treeView.Location = new Point(this.Left, this.Top + this.Height + 1); 
            } 
        } 
  
        /// <summary> 
        /// private method, sets the controls size and location.  
        /// It sets the control's and sub control's sizes and locations 
        /// </summary> 
        private void SetSizeAndLocation() 
        { 
            tvMinWidth = this.Width; 
            if (useComboxBox != null && btnSelect != null) 
            { 
                btnSelect.Size = new Size(useComboxBox.Height, 18); 
                useComboxBox.Width = this.Width - btnSelect.Width - 4; 
                useComboxBox.Location = new Point(0, 0); 
                btnSelect.Left = useComboxBox.Width + 4; 
                SetTreeViewSizeAndLocation(); 
                this.Height = useComboxBox.Height; 
            } 
        } 
    } 
  
  
    /// <summary> 
    /// Extended Label control with user paint. 
    /// </summary> 
    public 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); 
            System.Windows.Forms.ControlPaint.DrawSizeGrip(e.Graphics, Color.Black, 0, 0, 16, 16); 
        } 
    } 
  
  
    /// <summary> 
    ///  
    /// </summary> 
    public class ComboboxItem 
    { 
  
  
        string _Text; 
        public string Text { 
            get { return _Text; } 
            set { _Text = value; } 
        } 
        object _Value; 
        public object Value { 
            get { return _Value; } 
            set { _Value = value; } 
         } 
  
        public override string ToString() 
        { 
            return Text; 
        } 
    } 
    /// <summary> 
    ///  
    /// </summary> 
    public  class CustComboboxItem 
    { 
        public static string ComboxText; 
        public static string ComboxValue; 
    } 
    //private string _Text; 
  
    //        public string ComboxText 
    //        { 
    //            get { return _Text; } 
    //            set { _Text = value; } 
    //        } 
    //private string _Value; 
  
    //        public string ComboxValue 
    //        { 
    //            get { return _Value; } 
    //            set { _Value = value; } 
    //        } 
    /// <summary> 
    /// Extended button control with userpaint 
    /// </summary> 
    public 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); 
            System.Windows.Forms.ControlPaint.DrawComboButton(e.Graphics, 0, 0, this.Width, this.Height, state); 
        } 
    } 
}