C# button重绘

1.添加一个新类

using System;
using System.Windows;
using System.Windows.Forms;
using System.Collections.Generic;
using System.Text;
using System.Drawing;

namespace WindowsFormsApplication2
{
class MyButton:System.Windows.Forms.Button
{
private bool mouseDown = false;
private bool mouseHover = false;

public MyButton()
{
SetStyle(ControlStyles.UserPaint, true);

MouseDown += new MouseEventHandler(OnMouseDown);
MouseUp += new MouseEventHandler(OnMouseUp);
MouseEnter += new EventHandler(OnMouseEnter);
MouseLeave +=new EventHandler(OnMouseLeave);

Height = 23;
Width = 72;
BackColor = Color.Red;
ForeColor = Color.Black;
FlatStyle = System.Windows.Forms.FlatStyle.Flat;
Font = System.Windows.Forms.Control.DefaultFont;

// UseWaitCursor = true;
}

private void OnMouseDown(object sender, MouseEventArgs e)
{
mouseDown = true;
}

private void OnMouseUp(object sender, MouseEventArgs e)
{
mouseDown = false;
OnPaint(new PaintEventArgs(CreateGraphics(), ClientRectangle));
}

private void OnMouseEnter(object sender, EventArgs e)
{
mouseHover = true;
OnPaint(new PaintEventArgs(CreateGraphics(), ClientRectangle));
}

private void OnMouseLeave(object sender, EventArgs e)
{
mouseHover = false;
OnPaint(new PaintEventArgs(CreateGraphics(),ClientRectangle));
}

protected override void OnPaint(PaintEventArgs pevent)
{
pevent.Graphics.FillRectangle(new SolidBrush(Parent.BackColor), pevent.ClipRectangle );
if (Enabled == false)
{
DrawDisableButton(pevent.Graphics);
}
else if(mouseDown)
{
DrawMoseDownButton(pevent.Graphics);
}
else if (mouseHover)
{
DrawMosueHoverButton(pevent.Graphics);
}
else if(Focused)
{
DrawContaionFoceuButton(pevent.Graphics);
}
WriteText(pevent.Graphics);
}

private void WriteText(Graphics g)
{
int x = 0, y = 0;
Size s = g.MeasureString(Text, Font).ToSize();
x = (Width - s.Width) / 2;
y = (Height - s.Height) / 2;
if (Enabled)
g.DrawString(Text, Font, Brushes.Black, x, y);
else
g.DrawString(Text, Font, Brushes.Gray, x, y);
}

private void DrawContaionFoceuButton(Graphics g)
{
DrawBorder(g, 5);
PaintBack(g, SystemColors.ControlLightLight);
}

private void DrawMosueHoverButton(Graphics g)
{
DrawBorder(g, 2);
PaintBack(g, SystemColors.ControlLightLight);
}

private void DrawMoseDownButton(Graphics g)
{
DrawBorder(g, 3);
PaintBack(g, SystemColors.ControlLight);
}

private void DrawDisableButton(Graphics g)
{
DrawBorder(g, 4);
PaintBack(g, SystemColors.ControlLight);
}

private void PaintBack(Graphics g, Color c)
{
g.FillRectangle(new SolidBrush(c), 3, 3, Width - 6, Height-6);
}
private void DrawBorder(Graphics g, int state)
{
if (state == 1) // draw normal style border
{
Pen p = new Pen(SystemColors.ControlLightLight, 2);
g.DrawLine(p, 1, 1, 1, Height-2);
g.DrawLine(p, 1, 1, Width - 2, 1);
g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2);
g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1);
}
else if (state == 2)//draw hover style border
{
Pen p = new Pen(Color.Yellow, 2);
g.DrawLine(p, 1, 1, 1, Height - 2);
g.DrawLine(p, 1, 1, Width - 2, 1);
g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2);
g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1);
}
else if (state == 3)//draw pressed style border
{
Pen p = new Pen(SystemColors.ControlDark, 2);
g.DrawLine(p, 1, 1, 1, Height - 2);
g.DrawLine(p, 1, 1, Width - 2, 1);
g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2);
g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1);
}
else if (state == 4)//draw disabled style border
{
Pen p = new Pen(SystemColors.ControlLight, 2);
g.DrawLine(p, 1, 1, 1, Height - 2);
g.DrawLine(p, 1, 1, Width - 2, 1);
g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2);
g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1);
}
else if (state == 5)//draw default style border
{
Pen p = new Pen(Color.SkyBlue, 2);
g.DrawLine(p, 1, 1, 1, Height - 2);
g.DrawLine(p, 1, 1, Width - 2, 1);
g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2);
g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1);
}

if (state==4)
{
Pen p = new Pen(Color.FromArgb(161, 161, 146), 1);
g.DrawLine(p, 0, 2, 0, Height - 3);
g.DrawLine(p, 2, 0, Width - 3, 0);
g.DrawLine(p, Width - 1, 2, Width - 1, Height - 3);
g.DrawLine(p, 2, Height - 1, Width - 3, Height - 1);
g.DrawLine(p, 0, 2, 2, 0);
g.DrawLine(p, 0, Height - 3, 2, Height - 1);
g.DrawLine(p, Width - 3, 0, Width - 1, 2);
g.DrawLine(p, Width - 3, Height - 1, Width - 1, Height - 3);
}
else
{
g.DrawLine(Pens.Black, 0, 2, 0, Height - 3);
g.DrawLine(Pens.Black, 2, 0, Width - 3, 0);
g.DrawLine(Pens.Black, Width - 1, 2, Width - 1, Height - 3);
g.DrawLine(Pens.Black, 2, Height - 1, Width - 3, Height - 1);
g.DrawLine(Pens.Black, 0, 2, 2, 0);
g.DrawLine(Pens.Black, 0, Height - 3, 2, Height - 1);
g.DrawLine(Pens.Black, Width - 3, 0, Width - 1, 2);
g.DrawLine(Pens.Black, Width - 3, Height - 1,
Width - 1, Height - 3);
}
}

}

}
2.在Form中的设计文件中

this.button1 = new MyButton();

private MyButton button1;