有关控件透明度的控制！
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.ComponentModel;
namespace WindowsFormsApplication2
{
public class ExButton : Button
{
public ExButton()
{
this.Cursor = Cursors.Hand;
}
private bool mouseover = false;
private Color _topColor = Color.FromArgb(166, 222, 255);
private Color _bottomColor = Color.FromArgb(234, 247, 254);
[DefaultValue(typeof(Color), "166, 222, 255")]
public Color TopColor
{
get
{
return _topColor;
}
set
{
_topColor = value;
base.Invalidate(true);
}
}
[DefaultValue(typeof(Color), "234, 247, 254")]
public Color BottomColor
{
get
{
return _bottomColor;
}
set
{
_bottomColor = value;
base.Invalidate(true);
}
}
[TypeConverter(typeof(OpacityConverter))]
public double Opacity
{
get;
set;
}
protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
Color c5 = _topColor;//按钮表面上部颜色
Color c2 = _bottomColor;//按钮表面下部颜色
if (mouseover)//鼠标移入的话重新改变
{
c5 = Color.Gainsboro;
c2 = Color.Gray;
}
Brush b = new System.Drawing.Drawing2D.LinearGradientBrush(ClientRectangle, c5, c2, LinearGradientMode.Vertical);
int offsetwidth = this.Width / 50;
Point[] points = new Point[8];
points[0].X = offsetwidth;
points[0].Y = 0;
points[1].X = this.Width - offsetwidth;
points[1].Y = 0;
points[2].X = this.Width;
points[2].Y = offsetwidth;
points[3].X = this.Width;
points[3].Y = this.Height - offsetwidth;
points[4].X = this.Width - offsetwidth;
points[4].Y = this.Height;
points[5].X = offsetwidth;
points[5].Y = this.Height;
points[6].X = 0;
points[6].Y = this.Height - offsetwidth;
points[7].X = 0;
points[7].Y = offsetwidth;
e.Graphics.FillPolygon(b, points, FillMode.Winding);
int offsetwidth1 = (this.Width - 5) / 50 + 2;
Point[] points1 = new Point[8];
points1[0].X = offsetwidth1;
points1[0].Y = 2;
points1[1].X = this.Width - offsetwidth1;
points1[1].Y = 2;
points1[2].X = this.Width - 1;
points1[2].Y = offsetwidth1;
points1[3].X = this.Width - 1;
points1[3].Y = this.Height - offsetwidth1;
points1[4].X = this.Width - offsetwidth1;
points1[4].Y = this.Height - 1;
points1[5].X = 1;
points1[5].Y = this.Height - 1;
points1[6].X = 2;
points1[6].Y = this.Height - offsetwidth1;
points1[7].X = 2;
points1[7].Y = offsetwidth1;
Pen p = new Pen(Color.Orange, 2);
Pen p1 = new Pen(Color.Wheat, 2);
e.Graphics.DrawLine(p1, points1[0], points1[1]);
e.Graphics.DrawLine(p, points1[1], points1[2]);
e.Graphics.DrawLine(p, points1[2], points1[3]);
e.Graphics.DrawLine(p, points1[3], points1[4]);
e.Graphics.DrawLine(p, points1[4], points1[5]);
e.Graphics.DrawLine(p, points1[5], points1[6]);
e.Graphics.DrawLine(p1, points1[6], points1[7]);
e.Graphics.DrawLine(p1, points1[7], points1[0]);
e.Graphics.DrawPolygon(new Pen(Color.DarkBlue, 2), points);
StringFormat drawFormat = new StringFormat();
drawFormat.FormatFlags = StringFormatFlags.DisplayFormatControl;
drawFormat.LineAlignment = StringAlignment.Center;
drawFormat.Alignment = System.Drawing.StringAlignment.Center;
e.Graphics.DrawString(this.Text, this.Font, new LinearGradientBrush(this.ClientRectangle, Color.Black, Color.Black, LinearGradientMode.Vertical), this.ClientRectangle, drawFormat);
b.Dispose();
}
protected override void OnMouseEnter(EventArgs e)
{
mouseover = true;
this.Invalidate(false);
base.OnMouseEnter(e);
}
protected override void OnMouseLeave(EventArgs e)
{
mouseover = false;
this.Invalidate(false);
base.OnMouseLeave(e);
}
}
}
