CWinForm自定义进度条控件

　　继承ProgressBar
　　public enum TextPosition     {         Left,         Right,         Center,         Sliding,         None     }     public class BzProgressBar : ProgressBar     {          private Color channelColor = Color.LightSteelBlue;         private Color sliderColor = Color.RoyalBlue;         private Color foreBackColor = Color.RoyalBlue;         private int channelHeight = 6;         private int sliderHeight = 6;         private TextPosition showValue = TextPosition.Right;           public BzProgressBar()         {             this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);             this.SetStyle(ControlStyles.UserPaint, true);             this.ForeColor = Color.White;         }         [Category(＂BZ Advance＂)]         public Color ChannelColor         {             get             {                 return channelColor;             }              set             {                 channelColor = value;                 this.Invalidate();             }         }         [Category(＂BZ Advance＂)]         public Color SliderColor         {             get             {                 return sliderColor;             }              set             {                 sliderColor = value;                 this.Invalidate();             }         }         [Category(＂BZ Advance＂)]         public Color ForeBackColor         {             get             {                 return foreBackColor;             }              set             {                 foreBackColor = value;                 this.Invalidate();             }         }         [Category(＂BZ Advance＂)]         public int ChannelHeight         {             get             {                 return channelHeight;             }              set             {                 channelHeight = value;                 this.Invalidate();             }         }         [Category(＂BZ Advance＂)]         public int SliderHeight         {             get             {                 return sliderHeight;             }              set             {                 sliderHeight = value;                 this.Invalidate();             }         }         [Category(＂BZ Advance＂)]         public TextPosition ShowValue         {             get             {                 return showValue;             }              set             {                 showValue = value;                 this.Invalidate();             }         }          [Category(＂BZ Advance＂)]         [Browsable(true)]         [EditorBrowsable(EditorBrowsableState.Always)]         public override Font Font         {             get             {                 return base.Font;             }              set             {                 base.Font = value;             }         }          [Category(＂BZ Advance＂)]         public override Color ForeColor         {             get             {                 return base.ForeColor;             }              set             {                 base.ForeColor = value;             }         }           protected override void OnPaint(PaintEventArgs e)         {              Graphics graphics = e.Graphics;             Rectangle rectChannel = new Rectangle(0, 0, this.Width, channelHeight);             using (var brushChannel = new SolidBrush(channelColor))             {                 if (channelHeight >= sliderHeight)                 {                     rectChannel.Y = this.Height - channelHeight;                 }                 else                 {                     rectChannel.Y = this.Height - ((channelHeight + sliderHeight) / 2);                 }                  graphics.Clear(this.Parent.BackColor);                 graphics.FillRectangle(brushChannel, rectChannel);              }              double scaleFactor = (((double)this.Value - this.Minimum)) / (((double)this.Maximum - this.Minimum));             int sliderWidth = (int)(this.Width * scaleFactor);             Rectangle rectSlider = new Rectangle(0, 0, sliderWidth, SliderHeight);             using (var brushSlider = new SolidBrush(sliderColor))             {                 if (SliderHeight >= channelHeight)                 {                     rectSlider.Y = this.Height - sliderHeight;                 }                 else                 {                     rectSlider.Y = this.Height - (sliderHeight + channelHeight) / 2;                 }                  if (sliderWidth > 1)                 {                     graphics.FillRectangle(brushSlider, rectSlider);                 }                 if (ShowValue != TextPosition.None)                 {                     DrawValueText(graphics, sliderWidth, rectSlider);                 }             }              base.OnPaint(e);         }          /// 
         /// 显示进度百分比         /// 
         ///          ///          ///          private void DrawValueText(Graphics graphics, int sliderWidth, Rectangle rectSlider)         {             string text = this.Value.ToString() + ＂%＂;             var textSize = TextRenderer.MeasureText(text, this.Font);             var rectText = new Rectangle(0, 0, textSize.Width, textSize.Height + 2);             using (var brushText = new SolidBrush(this.ForeColor))             using (var brushTextBack = new SolidBrush(this.ForeBackColor))             using (var textFormat = new StringFormat())             {                 switch (showValue)                 {                     case TextPosition.Left:                         rectText.X = 0;                         textFormat.Alignment = StringAlignment.Near;                         break;                     case TextPosition.Right:                         rectText.X = this.Width - textSize.Width;                         textFormat.Alignment = StringAlignment.Far;                         break;                     case TextPosition.Center:                         rectText.X = (this.Width - textSize.Width) / 2;                         textFormat.Alignment = StringAlignment.Center;                         break;                     case TextPosition.Sliding:                         rectText.X = sliderWidth - textSize.Width;                         textFormat.Alignment = StringAlignment.Center;                         using (var brushClear = new SolidBrush(this.Parent.BackColor))                         {                             var rect = rectSlider;                             rect.Y = rectText.Y;                             rect.Height = rect.Height;                             graphics.FillRectangle(brushClear, rect);                         }                         break;                     default:                         break;                 }                 graphics.FillRectangle(brushTextBack, rectText);                 graphics.DrawString(text, this.Font, brushText, rectText, textFormat);             }          }     }