扩展Button，实例演示如何自绘控件外观
扩展Button，实例演示如何自绘控件外观
在论坛中看到之后，在博客中保存一个，备查。感谢作者无私贡献。
/// <summary> /// 扩展Button，演示如何自绘控件外观 /// </summary> public class MyButton : System.Windows.Forms.Button { private bool mouseDown = false; //设置鼠标位置状态按下 private bool mouseHover = false; //设置鼠标位置状态悬停 public MyButton() { // // TODO: Add constructor logic here // // BackColor=System.Drawing.Color.Blue; //设置背景色为蓝色 // FlatStyle=System.Windows.Forms.FlatStyle.Flat; // Font=System.Windows.Forms.Control.DefaultFont; // ForeColor=System.Drawing.Color.White; MouseDown += new MouseEventHandler(OnMouseDown); //重写鼠标按下事件 MouseUp += new MouseEventHandler(OnMouseUp); //重写鼠标弹上事件 MouseEnter += new EventHandler(OnMouseEnter); //重写鼠标焦点事件 MouseLeave += new EventHandler(OnMouseLeave); //重写鼠标悬停事件 } //重载OnPaint事件 protected override void OnPaint(PaintEventArgs pe) { pe.Graphics.Clear(this.Parent.BackColor); //填充一个矩形的形状来展示按钮 pe.Graphics.FillEllipse(new SolidBrush(Parent.BackColor), pe.ClipRectangle); if (Enabled == false) { //没有被灰掉 DrawDisableButton(pe.Graphics); //添加按钮文字 WriteText(pe.Graphics); } else if (mouseDown) { //当鼠标按下 DrawMouseDownButton(pe.Graphics); WriteTextL(pe.Graphics); } else if (mouseHover) { //当鼠标悬停 DrawMouseHoverButton(pe.Graphics); //添加按钮文字 WriteText(pe.Graphics); } else if (Focused) { //当按钮得到焦点 DrawContainFocusButton(pe.Graphics); WriteText(pe.Graphics); //添加按钮文字 } else //当处在正常条件下 { DrawNomalButton(pe.Graphics); WriteText(pe.Graphics); //添加按钮文字 } } private void OnMouseDown(object sender, System.Windows.Forms.MouseEventArgs e) //当鼠标按下 { mouseDown = true; } private void OnMouseUp(object sender, System.Windows.Forms.MouseEventArgs e) { mouseDown = false; PaintEventArgs pe = new PaintEventArgs(CreateGraphics(), ClientRectangle); //重画矩形按钮 OnPaint(pe); } private void OnMouseEnter(object sender, System.EventArgs e) { mouseHover = true; PaintEventArgs pe = new PaintEventArgs(CreateGraphics(), ClientRectangle); //重画矩形按钮 OnPaint(pe); } private void OnMouseLeave(object sender, System.EventArgs e) { mouseHover = false; PaintEventArgs pe = new PaintEventArgs(CreateGraphics(), ClientRectangle); //重画矩形按钮 OnPaint(pe); } private void DrawBorder(Graphics g, int state) { //int x=0,y=0; //填充矩形位置 if (state == 1) { // Pen p=new Pen(SystemColors.ControlLightLight,2); } else if (state == 2) { //当鼠标悬停的时候 } else if (state == 3) { } else if (state == 5) { } else if (state == 6) { //当按钮灰掉的时候,重画按钮 // Pen p=new Pen(Color.FromArgb(161,161,161) ,1); } else { //当按钮为普通状态的时候 // Pen p=new Pen(Color.FromArgb(161,161,161) ,1); } } private void DrawNomalButton(Graphics g) { DrawBorder(g, 1); PaintBack(g, SystemColors.ControlLightLight); } private void DrawMouseHoverButton(Graphics g) { DrawBorder(g, 2); //当鼠标悬停的时候背景变篮 PaintBack(g, Color.SkyBlue); } private void DrawMouseDownButton(Graphics g) { DrawBorder(g, 3); PaintBack(g, SystemColors.ControlLightLight); } private void DrawDisableButton(Graphics g) { DrawBorder(g, 4); PaintBack(g, SystemColors.ControlLightLight); } private void DrawContainFocusButton(Graphics g) { DrawBorder(g, 5); PaintBack(g, SystemColors.ControlLightLight); } //融合背景色 private void PaintBack(Graphics g, Color c) { //用椭圆填充背景色3,3,Width-6,Height-6 g.FillEllipse(new SolidBrush(c), 3, 3, Width - 6, Height - 6); } 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) //画文字 { g.DrawString(Text, Font, Brushes.Black, x, y); } else { g.DrawString(Text, Font, Brushes.Gray, x, y); } } private void WriteTextL(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) //画文字 { g.DrawString(Text, Font, Brushes.Black, x + 1, y + 1); } else { g.DrawString(Text, Font, Brushes.Gray, x + 1, y + 1); } } }