自定义控件中只包含一个LinkLabel，AutoSize属性被设置为False，Dock属性被设置为Full，TextAlign属性被设置为MiddleLeft。
C#代码如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace SatyrAndNymph
{
/// <summary>
/// 展开/收起控制器
/// </summary>
public partial class HeightController : UserControl
{
/// <summary>
/// 展开/收起控制器
/// </summary>
public HeightController()
{
InitializeComponent();
}
private void HeightController_Load(object sender, EventArgs e)
{
//设计器模式时，不触发展开/收起，否则会对设计工作造成干扰
if (!this.DesignMode)
{
//调整展开/收起情况
if (ControllerStatus == ControllerStatusEnum.FOLD)
{
Fold();
}
else if (ControllerStatus == ControllerStatusEnum.EXPAND)
{
Expand();
}
}
}
/// <summary>
/// 控制器状态
/// </summary>
private ControllerStatusEnum _controllerStatus = ControllerStatusEnum.FOLD;
///<summary>
/// 控制器状态
///</summary>
[System.ComponentModel.Description("控制器状态")]
public ControllerStatusEnum ControllerStatus
{
get
{
return _controllerStatus;
}
set
{
_controllerStatus = value;
}
}
/// <summary>
/// 父容器展开
/// </summary>
public void Expand()
{
ControllerStatus = ControllerStatusEnum.EXPAND;
if (this.Parent != null)
{
this.Parent.Height = HeightWhenExpand;
}
this.lnkHeightController.Text = DescriptionWhenExpand;
}
/// <summary>
/// 父容器收起
/// </summary>
public void Fold()
{
ControllerStatus = ControllerStatusEnum.FOLD;
if (this.Parent != null)
{
this.Parent.Height = HeightWhenFold;
}
this.lnkHeightController.Text = DescriptionWhenFold;
}
/// <summary>
/// 收起时高度
/// </summary>
private int _heightWhenFold = 50;
///<summary>
/// 收起时高度
///</summary>
[DefaultValue(50)]
[System.ComponentModel.Description("收起时高度")]
public int HeightWhenFold
{
get
{
return _heightWhenFold;
}
set
{
_heightWhenFold = value;
}
}
/// <summary>
/// 收起时显示文字
/// </summary>
private string _descriptionWhenFold = "展开";
///<summary>
/// 收起时显示文字
///</summary>
[System.ComponentModel.Description("收起时显示文字")]
public string DescriptionWhenFold
{
get
{
return _descriptionWhenFold;
}
set
{
_descriptionWhenFold = value;
}
}
/// <summary>
/// 展开时高度
/// </summary>
private int _heightWhenExpand = 85;
///<summary>
/// 展开时高度
///</summary>
[DefaultValue(85)]
[System.ComponentModel.Description("展开时高度")]
public int HeightWhenExpand
{
get
{
return _heightWhenExpand;
}
set
{
_heightWhenExpand = value;
}
}
/// <summary>
/// 展开时显示文字
/// </summary>
private string _descriptionWhenExpand = "收起";
///<summary>
/// 展开时显示文字
///</summary>
[System.ComponentModel.Description("展开时显示文字")]
public string DescriptionWhenExpand
{
get
{
return _descriptionWhenExpand;
}
set
{
_descriptionWhenExpand = value;
}
}
/// <summary>
/// 点击LinkLabel文字
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void lnkHeightController_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
if (this.Parent != null)
{
int height = this.Parent.Height;
//根据父容器高度判断父容器应是收起还是展开
if (ControllerStatus == ControllerStatusEnum.FOLD)
{
Expand();
}
else
{
Fold();
}
}
}
}
}
