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Winform组合ComboBox和TreeView实现ComboTreeView(一)
2019-09-30 16:48:57 】 浏览:150
Tags:Winform 组合 ComboBox TreeView 实现 ComboTreeView

最近做Winform项目需要用到类似ComboBox的TreeView控件。

虽然各种第三方控件很多,但是存在各种版本不兼容问题。所以自己写了个简单的ComboTreeView控件。

下图是实现效果:

目前实现的比较简单,能满足我项目中的需求。

此处是项目中的代码简化后的版本,供大家参考。

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Windows.Forms;
  4 
  5 namespace CustomControl.Tree
  6 {
  7     public abstract class ComboTreeView<T> : ComboBox where T : class
  8     {
  9         protected const int WM_LBUTTONDOWN = 0x0201, WM_LBUTTONDBLCLK = 0x0203;
 10 
 11         protected TreeView treeView;
 12         protected ToolStripControlHost treeViewHost;
 13         protected ToolStripDropDown dropDown;
 14         protected bool dropDownOpen = false;
 15         protected TreeNode selectedNode;
 16         protected T toBeSelected;
 17 
 18         public ComboTreeView(TreeView internalTreeView)
 19         {
 20             if (null == internalTreeView)
 21             {
 22                 throw new ArgumentNullException("internalTreeView");
 23             }
 24             this.InitializeControls(internalTreeView);
 25         }
 26 
 27         public event TreeNodeChangedEventHandler TreeNodeChanged;
 28 
 29         protected virtual void InitializeControls(TreeView internalTreeView)
 30         {
 31             this.treeView = internalTreeView;
 32             this.treeView.BorderStyle = BorderStyle.FixedSingle;
 33             this.treeView.Margin = new Padding(0);
 34             this.treeView.Padding = new Padding(0);
 35             this.treeView.AfterExpand += new TreeViewEventHandler(this.WhenAfterExpand);
 36 
 37             this.treeViewHost = new ToolStripControlHost(this.treeView);
 38             this.treeViewHost.Margin = new Padding(0);
 39             this.treeViewHost.Padding = new Padding(0);
 40             this.treeViewHost.AutoSize = false;
 41 
 42             this.dropDown = new ToolStripDropDown();
 43             this.dropDown.Margin = new Padding(0);
 44             this.dropDown.Padding = new Padding(0);
 45             this.dropDown.AutoSize = false;
 46             this.dropDown.DropShadowEnabled = true;
 47             this.dropDown.Items.Add(this.treeViewHost);
 48             this.dropDown.Closed += new ToolStripDropDownClosedEventHandler(this.OnDropDownClosed);
 49 
 50             this.DropDownWidth = this.Width;
 51             base.DropDownStyle = ComboBoxStyle.DropDownList;
 52             base.SizeChanged += new EventHandler(this.WhenComboboxSizeChanged);
 53         }
 54 
 55         public new ComboBoxStyle DropDownStyle
 56         {
 57             get { return base.DropDownStyle; }
 58             set { base.DropDownStyle = ComboBoxStyle.DropDownList; }
 59         }
 60 
 61         public virtual TreeNode SelectedNode
 62         {
 63             get { return this.selectedNode; }
 64             private set { this.treeView.SelectedNode = value; }
 65         }
 66 
 67         public virtual T SelectedNodeData
 68         {
 69             get { return (T)base.SelectedItem; }
 70             set
 71             {
 72                 this.toBeSelected = value;
 73                 this.UpdateComboBox(value);
 74             }
 75         }
 76 
 77         protected new int SelectedIndex
 78         {
 79             get { return base.SelectedIndex; }
 80             set { base.SelectedIndex = value; }
 81         }
 82 
 83         protected new object SelectedItem
 84         {
 85             get { return base.SelectedItem; }
 86             set { base.SelectedItem = value; }
 87         }
 88 
 89         public virtual string DisplayMember { get; set; } = "Name";
 90 
 91         /// <summary>Gets the internal TreeView control.</summary>
 92         public virtual TreeView TreeView => this.treeView;
 93 
 94         /// <summary>Gets the collection of tree nodes that are assigned to the tree view control.</summary>
 95         /// <returns>A <see cref="T:System.Windows.Forms.TreeNodeCollection" /> that represents the tree nodes assigned to the tree view cont
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