[翻译]具有TreeView下拉控件的ComboBox

Question

本帖最后由 caozhy 于 2012-10-03 12:45:30 编辑

Answer 1

其实自从WPF出现后，自定义控件就应该全交给WPF来完成了，这种功能的控件在WPF里面就是小儿科的实现，基础中的基础，虽然WPF的控件没有WinForm那么强大，但是WPF允许自定义控件，很容易将各个简单的控件拼凑成一个非常强大的复杂控件，而且做好的控件还可以被直接调用到WinForm中使用。

Answer 2

哗,中秋国庆都不休息啊,还发原创帖啊
不过,说真的,这个功能真的很少用到,甚至没见过
WinXP的Explorer.exe的地址栏也不是Combobox+TreeView,虽然有点像

Answer 3

一个UserControl,里面放一个Combobox和TreeView
然后在下拉和收缩时控制TreeView显示隐蔽行不行呢

Answer 4

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();            ComboTree MyComboTree = new ComboTree();
            this.Controls.Add(MyComboTree);
        }
    }    public class ComboTree : UserControl
    {
        private System.Windows.Forms.TreeView treeView1;
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.Panel panel1;        /// <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()
        {
            System.Windows.Forms.TreeNode treeNode1 = new System.Windows.Forms.TreeNode("节点0");
            System.Windows.Forms.TreeNode treeNode2 = new System.Windows.Forms.TreeNode("节点3");
            System.Windows.Forms.TreeNode treeNode3 = new System.Windows.Forms.TreeNode("节点4");
            System.Windows.Forms.TreeNode treeNode4 = new System.Windows.Forms.TreeNode("节点7");
            System.Windows.Forms.TreeNode treeNode5 = new System.Windows.Forms.TreeNode("节点8");
            System.Windows.Forms.TreeNode treeNode6 = new System.Windows.Forms.TreeNode("节点9");
            System.Windows.Forms.TreeNode treeNode7 = new System.Windows.Forms.TreeNode("节点5", new System.Windows.Forms.TreeNode[] {
            treeNode4,
            treeNode5,
            treeNode6});
            System.Windows.Forms.TreeNode treeNode8 = new System.Windows.Forms.TreeNode("节点6");
            System.Windows.Forms.TreeNode treeNode9 = new System.Windows.Forms.TreeNode("节点1", new System.Windows.Forms.TreeNode[] {
            treeNode2,
            treeNode3,
            treeNode7,
            treeNode8});
            System.Windows.Forms.TreeNode treeNode10 = new System.Windows.Forms.TreeNode("节点2");
            this.treeView1 = new System.Windows.Forms.TreeView();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.button1 = new System.Windows.Forms.Button();
            this.panel1 = new System.Windows.Forms.Panel();
            this.panel1.SuspendLayout();
            this.SuspendLayout();
            // 
            // treeView1
            // 
            this.treeView1.Dock = System.Windows.Forms.DockStyle.Fill;
            this.treeView1.Location = new System.Drawing.Point(0, 23);
            this.treeView1.Name = "treeView1";
            treeNode1.Name = "节点0";
            treeNode1.Text = "节点0";
            treeNode2.Name = "节点3";
            treeNode2.Text = "节点3";
            treeNode3.Name = "节点4";
            treeNode3.Text = "节点4";
            treeNode4.Name = "节点7";
            treeNode4.Text = "节点7";
            treeNode5.Name = "节点8";
            treeNode5.Text = "节点8";
            treeNode6.Name = "节点9";
            treeNode6.Text = "节点9";
            treeNode7.Name = "节点5";
            treeNode7.Text = "节点5";
            treeNode8.Name = "节点6";
            treeNode8.Text = "节点6";
            treeNode9.Name = "节点1";
            treeNode9.Text = "节点1";
            treeNode10.Name = "节点2";
            treeNode10.Text = "节点2";
            this.treeView1.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {
            treeNode1,
            treeNode9,
            treeNode10});
            this.treeView1.Size = new System.Drawing.Size(380, 273);
            this.treeView1.TabIndex = 1;
            this.treeView1.Visible = false;
            this.treeView1.VisibleChanged += new System.EventHandler(this.treeView1_VisibleChanged);
            this.treeView1.NodeMouseClick += new System.Windows.Forms.TreeNodeMouseClickEventHandler(this.treeView1_NodeMouseClick);
            // 
            // textBox1
            // 
            this.textBox1.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
                        | System.Windows.Forms.AnchorStyles.Right)));
            this.textBox1.BackColor = System.Drawing.Color.White;
            this.textBox1.Location = new System.Drawing.Point(0, 2);
            this.textBox1.Name = "textBox1";
            this.textBox1.ReadOnly = true;
            this.textBox1.Size = new System.Drawing.Size(347, 21);
            this.textBox1.TabIndex = 2;
            // 
            // button1
            // 
            this.button1.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
            this.button1.Location = new System.Drawing.Point(350, 3);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(30, 20);
            this.button1.TabIndex = 3;
            this.button1.Text = "↓";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // panel1
            // 
            this.panel1.Controls.Add(this.textBox1);
            this.panel1.Controls.Add(this.button1);
            this.panel1.Dock = System.Windows.Forms.DockStyle.Top;
            this.panel1.Location = new System.Drawing.Point(0, 0);
            this.panel1.Name = "panel1";
            this.panel1.Size = new System.Drawing.Size(380, 23);
            this.panel1.TabIndex = 4;
            // 
            // ComboTree
            // 
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
            this.Controls.Add(this.treeView1);
            this.Controls.Add(this.panel1);
            this.Name = "ComboTree";
            this.Size = new System.Drawing.Size(380, 296);
            this.panel1.ResumeLayout(false);
            this.panel1.PerformLayout();
            this.ResumeLayout(false);        }        public ComboTree()
        {
            InitializeComponent();            this.DoubleBuffered = true;
            treeView1.Visible = false;
        }        private void button1_Click(object sender, EventArgs e)
        {
            treeView1.Visible = !treeView1.Visible;
        }        private void treeView1_VisibleChanged(object sender, EventArgs e)
        {
            if (treeView1.Visible)
            {
                this.Height = panel1.Height + treeView1.Height;
            }
            else
            {
                this.Height = panel1.Height;
            }
        }        private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            if (e.Node.Bounds.Contains(e.Location))
            {
                textBox1.Text = e.Node.Text;
                treeView1.Visible = false;
            }
        }
    }
}
只会简单的方法

Answer 5

这个有两种简单的实现方法：
1　隐藏一个显示所有节点的大小的Treeview，在Combobox_DrawItem时遍历节点项，或者直接TreeViewer.DrawToBitmap2 纯代码绘制出一个TreeView我个人的实现方法（使用自定义控件，这个自定义控件不会接收焦点，但会响应鼠标事件，不会导致焦点抢占，内容绘制，使得整个自定义控件的显示内容是画上去的，只是通过实现鼠标交互来达到交互效果。其次，在展开自定义控件时，通过设置父窗体矩形，但不影响父窗体显示内容及背景来实现）。

Answer 6

MARK一下，等假期过来再好好研究研究！

Answer 7

OK
,Mark 了，慢慢学习。