实例介绍
【实例简介】
【实例截图】
【核心代码】
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Threading;
namespace Test
{
public partial class HsComboBox : ComboBox
{
//用于模拟键盘输入
[DllImport("user32.dll")]
private static extern void keybd_event(
byte bVk, byte bScan, uint dwFlags, int dwExtraInfo);
//显示控件
//Control Control;
//下拉面板
Panel panel;
//绘制面板用变量
//光标前一位置
Point pPoint;
//光标当前位置
Point cPoint;
//鼠标是否已按下
bool isMouseDown = false;
//关闭下拉时光标是否在ComboBox上
bool isCursorOnComboBox = false;
[Browsable(false)]
public Control Control { get; set; }
[Browsable(false)]
public CheckedListBox CheckedListBox { get; set; }
[Browsable(false)]
public TreeView TreeView { get; set; }
//控件类型
public enum TypeC
{
//默认普通ComboBox
ComboBox = 0,
CheckedListBox = 1,
TreeView = 2,
//普通Control
Control = 99
}
/// <summary>
/// 单位是否可见
/// </summary>
private TypeC _CtlType;
[Description("设置下拉类型。")]
[DefaultValue(0)]
public TypeC CtlType
{
get
{
return _CtlType;
}
set
{
_CtlType = value;
switch (_CtlType)
{
case TypeC.ComboBox:
break;
case TypeC.CheckedListBox:
CheckedListBox CheckedListBox = new CheckedListBox();
this.SetDropDown(CheckedListBox);
break;
case TypeC.TreeView:
TreeView TreeView = new TreeView();
this.SetDropDown(TreeView);
break;
default:
Control Control = new Panel();
this.SetDropDown(Control);
break;
}
}
}
public HsComboBox()
{
InitializeComponent();
}
public HsComboBox(IContainer container)
{
container.Add(this);
InitializeComponent();
//设置下拉样式为DropDownList，不能手动输入
this.DropDownStyle = ComboBoxStyle.DropDownList;
//绘制下拉面板
this.DrawPanel();
}
/// <summary>
/// 点击事件
/// </summary>
protected override void OnMouseClick(MouseEventArgs e)
{
//如果为Null则为原生ComboBox
if (this._CtlType != TypeC.ComboBox)
{
if (isCursorOnComboBox)
{
isCursorOnComboBox = false;
//模拟Enter键，取消掉下拉状态
keybd_event(0xD, 0, 0, 0);
keybd_event(0xD, 0, 0x0002, 0);
}
else
{
//创建下拉窗
ToolStripControlHost toolStripControlHost = new ToolStripControlHost(this.panel);
HsToolStripDropDown toolStripDropDown = new HsToolStripDropDown();
//设置边框
toolStripControlHost.Margin = Padding.Empty;
toolStripControlHost.Padding = Padding.Empty;
toolStripControlHost.AutoSize = false;
toolStripDropDown.Padding = Padding.Empty;
//添加
toolStripDropDown.Items.Add(toolStripControlHost);
toolStripDropDown.Show(this, 0, this.Height);
//设置宽度最小值
if (this.panel.Width < this.Width)
{
this.panel.Size = new System.Drawing.Size(this.Width, this.panel.Height);
}
//判断关闭时光标在ComboBox组件内
toolStripDropDown.Closed = delegate(object sender, ToolStripDropDownClosedEventArgs e1)
{
Rectangle rec = new Rectangle(0, 0, this.Width, this.Height);
this.isCursorOnComboBox = rec.Contains(this.PointToClient(Cursor.Position));
};
//设置焦点
toolStripDropDown.Focus();
}
}
}
/// <summary>
/// 绘制下拉面板
/// </summary>
public void DrawPanel()
{
this.panel = new Panel();
this.panel.Size = new System.Drawing.Size(this.Width, 100);
this.panel.Padding = new Padding(1, 1, 1, 13);
this.panel.BackColor = Color.Gainsboro;
//绘制边线
this.panel.Paint = delegate(object sender, PaintEventArgs e)
{
ControlPaint.DrawBorder(e.Graphics,
this.panel.ClientRectangle,
Color.DarkGray,
1,
ButtonBorderStyle.Solid,
Color.DarkGray,
1,
ButtonBorderStyle.Solid,
Color.DarkGray,
1,
ButtonBorderStyle.Solid,
Color.DarkGray,
1,
ButtonBorderStyle.Solid);
};
//使用Label实现右下角拖动按钮
Label label = new Label();
label.Text = "◢";
label.Font = new Font("宋体", 9);
label.Parent = this.panel;
label.AutoSize = true;
label.Anchor = (AnchorStyles.Bottom | AnchorStyles.Right);
label.Location = new Point(this.panel.Location.X this.panel.Size.Width - label.Width 3,
this.panel.Location.Y this.panel.Size.Height - label.Height - 1);
//实现缩放功能
label.MouseDown = delegate(object sender, MouseEventArgs e1)
{
this.pPoint = Cursor.Position;
this.isMouseDown = true;
};
label.MouseLeave = delegate(object sender, EventArgs e1)
{
this.isMouseDown = false;
};
label.MouseMove = delegate(object sender, MouseEventArgs e1)
{
this.cPoint = Cursor.Position;
if (e1.Button == MouseButtons.Left && isMouseDown)
{
this.panel.Height = Math.Max(this.panel.Height cPoint.Y - pPoint.Y, 23);
this.panel.Width = Math.Max(this.panel.Width cPoint.X - pPoint.X, this.Width);
pPoint = Cursor.Position;
}
else
{
label.Cursor = Cursors.SizeNWSE;
}
};
}
/// <summary>
/// 设置下拉内容-普通Control
/// </summary>
public void SetDropDown(Control control)
{
//需要将此前的Control注销掉，否则会一直显示在Panel中
if(this.Control != null)
{
this.Control.Dispose();
}
this.Control = control;
this.Control.Location = new Point(0, 0);
this.Control.Dock = DockStyle.Fill;
this.Control.Parent = this.panel;
//将下拉高度设为1,实现隐藏效果
this.DropDownHeight = 1;
}
/// <summary>
/// 设置下拉内容-复选框列表
/// </summary>
public void SetDropDown(CheckedListBox checkedListBox)
{
//单击可选中
checkedListBox.CheckOnClick = true;
//边框格式
checkedListBox.BorderStyle = BorderStyle.None;
//去掉强制的高度修改,CheckedListBox的一个特殊高度判断，如果为true则会在底端多出一段空白
checkedListBox.IntegralHeight = false;
//选中事件添加监听（此时还未选中，刚Check还没有Checked）
checkedListBox.ItemCheck = delegate(object sender, ItemCheckEventArgs e)
{
String text = "";
for (int i = 0; i < ((CheckedListBox)(this.Control)).Items.Count; i )
{
//使用异或特殊处理当前正在check的条目
if ((i == e.Index) != ((CheckedListBox)(this.Control)).GetItemChecked(i))
{
text = ((CheckedListBox)(this.Control)).Items[i].ToString() ",";
}
}
text = text.Substring(0,Math.Max(text.Length-1,0));
//显示所有内容
ShowText(text);
};
this.CheckedListBox = checkedListBox;
this.SetDropDown((Control)checkedListBox);
}
/// <summary>
/// 设置下拉内容-树形列表
/// </summary>
public void SetDropDown(TreeView treeView)
{
//整行选择
treeView.FullRowSelect = true;
//边框格式
treeView.BorderStyle = BorderStyle.None;
//选中事件添加监听
treeView.AfterSelect = delegate(object sender, TreeViewEventArgs e)
{
ShowText(((TreeView)(this.Control)).SelectedNode.Text);
};
this.TreeView = treeView;
this.SetDropDown((Control)treeView);
}
/// <summary>
/// 显示信息
/// </summary>
/// <param name="Text">信息内容</param>
public void ShowText(String Text)
{
//当DropDownStyle = DropDownList时不能直接对Text赋值
this.Items.Clear();
this.Items.Add(Text);
this.SelectedIndex = 0;
}
}
/// <summary>
/// 重写ToolStripDropDown
/// 使用双缓存减少闪烁
/// </summary>
public class HsToolStripDropDown : ToolStripDropDown
{
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= 0x02000000;//双缓存
return cp;
}
}
}
}
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