可以显示渐变背景色的Lable
///如未特别说明,本人所发表的技术文章都为原创, 任何人引用都请注明出处,并包含本声明
///作者: CSDN网名alias88,邮件:alias88@163.com,QQ:63343
using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
namespace upLibrary.upControls
{
/// <summary>
/// 可以显示渐变背景色的Lable
/// </summary>
public class upLabel : System.Windows.Forms.Label
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
private Color startColor = Color.Wheat ;
private Color endColor = Color.LimeGreen;
private
Brush baseBackground=null;
private bool showGradient=true;
private float mAngle=75;
private bool _ShowText;
public upLabel()
{
InitializeComponent();
}
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region 组件设计器生成的代码
/// <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()
{
//
// upLabel
//
this.Size = new System.Drawing.Size(144, 21);
}
#endregion
protected override void OnPaintBackground(PaintEventArgs e)
{
LinearGradientBrush lbs;
base.OnPaintBackground(e);
if (this.Disposing ) return ;
if (baseBackground == null)
{
if (ShowGradient)
{
lbs = new LinearGradientBrush(
ClientRectangle ,
StartColor ,
EndColor,
Angle);
baseBackground=lbs;
}
else if (BackgroundImage != null)
{
baseBackground = new TextureBrush(BackgroundImage);
}
else
{
baseBackground = new SolidBrush(BackColor);
}
}
e.Graphics.FillRectangle(baseBackground, ClientRectangle);
e.Graphics.Flush();
}
[
Category("渐变"),
DefaultValue(true),
Description("指示是否显示文本。")
]
public bool ShowText
{
get
{
return _ShowText;
}
set
{
if (value != _ShowText)
{
_ShowText = value;
if (baseBackground != null)
{
baseBackground.Dispose();
baseBackground = null;
}
Invalidate();
}
}
}
[
Category("渐变"),
DefaultValue(true),
Description("指示背景是否应显示颜色渐变。 ")
]
public bool ShowGradient
{
get
{
return showGradient;
}
set
{
if (value != showGradient)
{
showGradient = value;
if (baseBackground != null)
{
baseBackground.Dispose();
baseBackground = null;
}
Invalidate();
}
}
}
[
Category("渐变"),
Description("指定渐变的角度")
]
public float Angle
{
get
{
return mAngle;
}
set
{
mAngle = value;
if (baseBackground != null && ShowGradient)
{
baseBackground.Dispose();
baseBackground = null;
}
Invalidate();
}
}
[
Category("渐变"),
Description("指定渐变的开始颜色")
]
public Color StartColor
{
get
{
return startColor;
}
set
{
startColor = value;
if (baseBackground != null && ShowGradient)
{
baseBackground.Dispose();
baseBackground = null;
}
Invalidate();
}
}
[
Category("渐变"),
Description("指定渐变的结束颜色")
]
public Color EndColor
{
get
{
return endColor;
}
set
{
endColor = value;
if (baseBackground != null && ShowGradient)
{
baseBackground.Dispose();
baseBackground = null;
}
Invalidate();
}
}
[Description("当在设计器中更改属性时实现属性的序列化（持久性）")]
public bool ShouldSerializeStartColor()
{
return !(startColor == Color.Wheat);
}
public bool ShouldSerializeEndColor()
{
return !(endColor == Color.LimeGreen);
}
protected override void OnBackColorChanged(EventArgs e)
{
base.OnBackColorChanged(e);
if ((baseBackground != null) && (!ShowGradient))
{
baseBackground.Dispose();
baseBackground = null;
}
}
protected override void OnTextChanged(EventArgs e)
{
base.OnTextChanged(e);
if ((baseBackground != null) && (!ShowGradient))
{
baseBackground.Dispose();
baseBackground = null;
}
}
protected override void OnBackgroundImageChanged(EventArgs e)
{
base.OnBackgroundImageChanged(e);
if ((baseBackground != null) && (!ShowGradient))
{
baseBackground.Dispose();
baseBackground = null;
}
}
protected override void OnResize(EventArgs e)
{
base.OnResize(e);
if (baseBackground != null)
{
baseBackground.Dispose();
baseBackground = null;
}
}
}
}