学步园

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