WinForm Custom(二) 滑块控件

public class ZhmSlider : Control     {         private Rectangle foreRect;         private Rectangle backRect;         private Rectangle setRect;          private Color backgroundColor = Color.White;         private Color foregroundColor = Color.Gray;         private Color setRectColor = Color.Black;//滑块颜色         private Color fontColor = Color.Black;         private Color borderColor = Color.Black;          private int maximum = 100; //进度条最大值         private int minimum = 0;  //进度条最小值         private double _value = 0;//进度条当前值          private bool showPercent; //当前进度百分比         private float fontSize = 9;//          private FontFamily _fontFamily = new FontFamily("Segoe UI");          private Point originPoint;         private Point originsetRectPoint;         private bool setRectDown = false;          public ZhmSlider()         {             // 避免重绘时窗口闪烁             this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer | ControlStyles.ResizeRedraw | ControlStyles.UserPaint, true);              this.MouseDown += ZhmSlider_MouseDown;             this.MouseMove += ZhmSlider_MouseMove;             this.MouseUp += ZhmSlider_MouseUp;         }          private void ZhmSlider_MouseUp(object sender, MouseEventArgs e)         {             setRectDown = false;         }          private void ZhmSlider_MouseMove(object sender, MouseEventArgs e)         {             if (setRectDown)             {                 int dd = e.Location.X - originPoint.X;                  double percent = (double)(originsetRectPoint.X + dd - this.backRect.X) / (this.backRect.Width - this.backRect.Height);                 if (percent < 0)                 {                     this.Value = minimum;                     this.foreRect.Width = 0;                     this.setRect.X = backRect.X;                 }                 else if (percent > 1)                 {                     this.Value = maximum;                     this.foreRect.Width = this.backRect.Width;                     this.setRect.X = backRect.X + backRect.Width - backRect.Height;                 }                 else                 {                     this.Value = percent * maximum;                     this.foreRect.Width = (int)(percent * this.backRect.Width);                     this.setRect.X = originsetRectPoint.X + dd;                 }                 Invalidate();             }         }          private void ZhmSlider_MouseDown(object sender, MouseEventArgs e)         {             if (setRect.Contains(e.Location))             {                 this.originPoint = e.Location;                 originsetRectPoint = this.setRect.Location;                 this.setRectDown = true;             }         }          [Category("扩展属性"), Browsable(true)]         public bool ShowPercentTag         {             get { return showPercent; }             set             {                 showPercent = value;                 Invalidate();             }         }         [Category("扩展属性"),  Browsable(true)]         public int Maximum         {             get { return maximum; }             set             {                 maximum = value;                 Invalidate();             }         }         [Category("扩展属性"),  Browsable(true)]         public int Minimum         {             get { return minimum; }             set             {                 minimum = value;                 Invalidate();             }         }          [Category("扩展属性"), Browsable(true)]         public float FontSize         {             get { return fontSize; }             set             {                 this.fontSize = value;                 Invalidate();             }         }         [Category("扩展属性"), Browsable(true)]         public FontFamily FontFamily         {             get { return _fontFamily; }             set             {                 this._fontFamily = value;                 Invalidate();             }         }          [Category("扩展属性"), Browsable(true)]         public Color BackgroundColor         {             get { return backgroundColor; }             set             {                 this.backgroundColor = value;                 Invalidate();             }         }         [Category("扩展属性"), Browsable(true)]         public Color ForegroundColor         {             get { return foregroundColor; }             set             {                 this.foregroundColor = value;                 Invalidate();             }         }         [Category("扩展属性"), Browsable(true)]         public Color SetRectColor         {             get { return setRectColor; }             set             {                 this.setRectColor = value;                 Invalidate();             }         }         [Category("扩展属性"), Browsable(true)]         public Color FontColor         {             get { return fontColor; }             set             {                 this.fontColor = value;                 Invalidate();             }         }          [Category("扩展属性"), Browsable(true)]         public Color BorderColor         {             get { return borderColor; }             set             {                 this.borderColor = value;                 Invalidate();             }         }           //确定控件的位置。 我们根据宽度和高度属性确定矩形的位置。 因为Control类也有这两个属性，所以我们在前面添加new来覆盖原来的属性          [Category("扩展属性"), Browsable(true)]         public new int Width         {             get { return base.Width; }             set             {                 base.Width = value;                 foreRect.X = backRect.X = base.Width / 20;                 backRect.Width = base.Width * 9 / 10;                 foreRect.Width = (int)(_value / maximum * backRect.Width);                 setRect.X = (int)(_value / maximum * (backRect.Width - backRect.Height) + foreRect.X);                  Invalidate();             }         }         [Category("扩展属性"), Browsable(true)]         public new int Height         {             get { return base.Height; }             set             {                 base.Height = value;                 foreRect.Height = backRect.Height = setRect.Height = setRect.Width = base.Height / 3;                 foreRect.Y = backRect.Y = setRect.Y = base.Height / 3;                 Invalidate();             }         }          //值发生变化的属性。 当向事件添加外部响应函数时，事件将生效，否则OnValueChanged方法的值为空          protected EventHandler OnValueChanged;         public event EventHandler ValueChanged         {             add             {                 if (OnValueChanged != null)                     foreach (Delegate d in OnValueChanged.GetInvocationList())                         if (object.ReferenceEquals(d, value)) return;                 OnValueChanged = (EventHandler)Delegate.Combine(OnValueChanged, value);             }             remove             {                 OnValueChanged = (EventHandler)Delegate.Remove(OnValueChanged, value);             }         }          //定义value的值。 当Value值发生变化时，重置矩形的进度，控制块的位置，并重新绘制控件(如果在value属性中修改进度条的值，请使用_value变量，在其他地方，请使Value属性 )         [Category("扩展属性"), Browsable(true)]         public double Value         {             get { return _value; }             set             {                 if (_value < Minimum)                     throw new ArgumentException("Less than minimum");                 if (_value > Maximum)                     throw new ArgumentException("Exceeds the maximum");                  _value = value;                 foreRect.Width = (int)(_value / maximum * backRect.Width);                 setRect.X = (int)(_value / maximum * (backRect.Width - backRect.Height) + backRect.X);                  if ((_value - maximum) > 0)                 {                     foreRect.Width = backRect.Width;                     setRect.X = backRect.Width - backRect.Height + backRect.X;                 }                  if (OnValueChanged != null)                     OnValueChanged(this, EventArgs.Empty);                  Invalidate();             }         }         //绘制控件，重载OnPaint方法来绘制控件          protected override void OnPaint(PaintEventArgs pe)         {             base.OnPaint(pe);              DrawRect(pe.Graphics);             DrawText(pe.Graphics);         }          //滑块区域         private void DrawRect(Graphics e)         {             Pen pen = new Pen(this.foregroundColor);              e.FillRectangle(new SolidBrush(this.backgroundColor), backRect);             e.DrawRectangle(new Pen(this.borderColor), backRect);              e.FillRectangle(new SolidBrush(this.foregroundColor), foreRect);             e.DrawRectangle(new Pen(this.borderColor), foreRect);              e.FillRectangle(new SolidBrush(this.setRectColor), setRect);             e.DrawRectangle(new Pen(this.borderColor), setRect);         }           // 绘制文本         private void DrawText(Graphics e)         {             Point point = new Point();             point.X = this.backRect.X + this.backRect.Width * 3 / 7;             point.Y = this.backRect.Y + this.backRect.Height / 3;              SolidBrush brush = new SolidBrush(fontColor);             Font font = new Font(_fontFamily, this.fontSize);             string percent = ((int)this._value).ToString() + "%";              //设置文本居中             StringFormat format = new StringFormat();             format.Alignment = StringAlignment.Center;             format.LineAlignment = StringAlignment.Center;              e.DrawString(percent, font, brush, backRect, format);         }          //在设计期间更改控件的大小时调用OnResize方法。 当您拖动边缘上的箭头来更改控件的大小时，当需要对控件进行相应更改时，可以重写此方法。如果没有重新加载，则只有在修改完成后才会更新控件。         protected override void OnResize(EventArgs e)         {             base.OnResize(e);             this.Width = Width;             this.Height = Height;             Invalidate();         }     }