（五十）c#Winform自定义控件-滑块

官网

http://www.hzhcontrols.com

前提

入行已经7,8年了，一直想做一套漂亮点的自定义控件，于是就有了本系列文章。

GitHub：https://github.com/kwwwvagaa/NetWinformControl

码云：https://gitee.com/kwwwvagaa/net_winform_custom_control.git

如果觉得写的还行，请点个 star 支持一下吧

欢迎前来交流探讨： 企鹅群568015492 

麻烦博客下方点个【推荐】，谢谢

NuGet

Install-Package HZH_Controls

目录

https://www.cnblogs.com/bfyx/p/11364884.html

用处及效果

准备工作

依然是GDI+画的，不了解自行百度学习下

第二个有提示文字的用到了（五十一）c#Winform自定义控件-文字提示

开始

添加一个类UCTrackBar，继承Control

添加属性

  [Description("值改变事件"), Category("自定义")]
         public event EventHandler ValueChanged;

         private int dcimalDigits = ;

         [Description("值小数精确位数"), Category("自定义")]
         public int DcimalDigits
         {
             get { return dcimalDigits; }
             set { dcimalDigits = value; }
         }

         private float lineWidth = ;

         [Description("线宽度"), Category("自定义")]
         public float LineWidth
         {
             get { return lineWidth; }
             set { lineWidth = value; }
         }

         private float minValue = ;

         [Description("最小值"), Category("自定义")]
         public float MinValue
         {
             get { return minValue; }
             set
             {
                 if (minValue > m_value)
                     return;
                 minValue = value;
                 this.Refresh();
             }
         }

         private float maxValue = ;

         [Description("最大值"), Category("自定义")]
         public float MaxValue
         {
             get { return maxValue; }
             set
             {
                 if (value < m_value)
                     return;
                 maxValue = value;
                 this.Refresh();
             }
         }

         private float m_value = ;

         [Description("值"), Category("自定义")]
         public float Value
         {
             get { return this.m_value; }
             set
             {
                 if (value > maxValue || value < minValue)
                     return;
                 var v = (float)Math.Round((double)value, dcimalDigits);
                 if (value == v)
                     return;
                 this.m_value = v;
                 this.Refresh();
                 if (ValueChanged != null)
                 {
                     ValueChanged(this, null);
                 }
             }
         }

         private Color m_lineColor = Color.FromArgb(, , );

         [Description("线颜色"), Category("自定义")]
         public Color LineColor
         {
             get { return m_lineColor; }
             set
             {
                 m_lineColor = value;
                 this.Refresh();
             }
         }
         RectangleF m_lineRectangle;
         RectangleF m_trackRectangle;

重绘

  protected override void OnPaint(PaintEventArgs e)
         {
             base.OnPaint(e);
             Graphics g = e.Graphics;
             g.SetGDIHigh();
             m_lineRectangle = new RectangleF(lineWidth, (this.Size.Height - lineWidth) / , this.Size.Width - lineWidth * , lineWidth);
             GraphicsPath pathLine = ControlHelper.CreateRoundedRectanglePath(m_lineRectangle, );
             g.FillPath(new SolidBrush(m_lineColor), pathLine);
             m_trackRectangle = new RectangleF(m_lineRectangle.Left - lineWidth + (((float)m_value / (float)(maxValue - minValue)) * (this.Size.Width - lineWidth * )), (this.Size.Height - lineWidth * ) / , lineWidth * , lineWidth * );
             g.FillEllipse(new SolidBrush(m_lineColor), m_trackRectangle);
             g.FillEllipse(Brushes.White, new RectangleF(m_trackRectangle.X + m_trackRectangle.Width / , m_trackRectangle.Y + m_trackRectangle.Height / , m_trackRectangle.Width / , m_trackRectangle.Height / ));
         }

处理拖动

  public UCTrackBar()
         {
             this.Size = new Size(, );
             this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
             this.SetStyle(ControlStyles.DoubleBuffer, true);
             this.SetStyle(ControlStyles.ResizeRedraw, true);
             this.SetStyle(ControlStyles.Selectable, true);
             this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
             this.SetStyle(ControlStyles.UserPaint, true);
             this.MouseDown += UCTrackBar_MouseDown;
             this.MouseMove += UCTrackBar_MouseMove;
             this.MouseUp += UCTrackBar_MouseUp;
         }

         bool blnDown = false;
         void UCTrackBar_MouseDown(object sender, MouseEventArgs e)
         {
             if (m_lineRectangle.Contains(e.Location) || m_trackRectangle.Contains(e.Location))
             {
                 blnDown = true;
                 Value = ((float)e.Location.X / (float)this.Width) * (maxValue - minValue);
             }
         }
         void UCTrackBar_MouseMove(object sender, MouseEventArgs e)
         {
             if (blnDown)
             {
                 Value = ((float)e.Location.X / (float)this.Width) * (maxValue - minValue);
             }
         }
         void UCTrackBar_MouseUp(object sender, MouseEventArgs e)
         {
             blnDown = false;
         }

完整代码

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;
 using System.Drawing;
 using System.Drawing.Drawing2D;
 using System.ComponentModel;

 namespace HZH_Controls.Controls
 {
     public class UCTrackBar : Control
     {
         [Description("值改变事件"), Category("自定义")]
         public event EventHandler ValueChanged;

         private int dcimalDigits = ;

         [Description("值小数精确位数"), Category("自定义")]
         public int DcimalDigits
         {
             get { return dcimalDigits; }
             set { dcimalDigits = value; }
         }

         private float lineWidth = ;

         [Description("线宽度"), Category("自定义")]
         public float LineWidth
         {
             get { return lineWidth; }
             set { lineWidth = value; }
         }

         private float minValue = ;

         [Description("最小值"), Category("自定义")]
         public float MinValue
         {
             get { return minValue; }
             set
             {
                 if (minValue > m_value)
                     return;
                 minValue = value;
                 this.Refresh();
             }
         }

         private float maxValue = ;

         [Description("最大值"), Category("自定义")]
         public float MaxValue
         {
             get { return maxValue; }
             set
             {
                 if (value < m_value)
                     return;
                 maxValue = value;
                 this.Refresh();
             }
         }

         private float m_value = ;

         [Description("值"), Category("自定义")]
         public float Value
         {
             get { return this.m_value; }
             set
             {
                 if (value > maxValue || value < minValue)
                     return;
                 var v = (float)Math.Round((double)value, dcimalDigits);
                 if (value == v)
                     return;
                 this.m_value = v;
                 this.Refresh();
                 if (ValueChanged != null)
                 {
                     ValueChanged(this, null);
                 }
             }
         }

         private Color m_lineColor = Color.FromArgb(, , );

         [Description("线颜色"), Category("自定义")]
         public Color LineColor
         {
             get { return m_lineColor; }
             set
             {
                 m_lineColor = value;
                 this.Refresh();
             }
         }
         RectangleF m_lineRectangle;
         RectangleF m_trackRectangle;

         public UCTrackBar()
         {
             this.Size = new Size(, );
             this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
             this.SetStyle(ControlStyles.DoubleBuffer, true);
             this.SetStyle(ControlStyles.ResizeRedraw, true);
             this.SetStyle(ControlStyles.Selectable, true);
             this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
             this.SetStyle(ControlStyles.UserPaint, true);
             this.MouseDown += UCTrackBar_MouseDown;
             this.MouseMove += UCTrackBar_MouseMove;
             this.MouseUp += UCTrackBar_MouseUp;
         }

         bool blnDown = false;
         void UCTrackBar_MouseDown(object sender, MouseEventArgs e)
         {
             if (m_lineRectangle.Contains(e.Location) || m_trackRectangle.Contains(e.Location))
             {
                 blnDown = true;
                 Value = ((float)e.Location.X / (float)this.Width) * (maxValue - minValue);
             }
         }
         void UCTrackBar_MouseMove(object sender, MouseEventArgs e)
         {
             if (blnDown)
             {
                 Value = ((float)e.Location.X / (float)this.Width) * (maxValue - minValue);
             }
         }
         void UCTrackBar_MouseUp(object sender, MouseEventArgs e)
         {
             blnDown = false;
         }

         protected override void OnPaint(PaintEventArgs e)
         {
             base.OnPaint(e);
             Graphics g = e.Graphics;
             g.SetGDIHigh();
             m_lineRectangle = new RectangleF(lineWidth, (this.Size.Height - lineWidth) / , this.Size.Width - lineWidth * , lineWidth);
             GraphicsPath pathLine = ControlHelper.CreateRoundedRectanglePath(m_lineRectangle, );
             g.FillPath(new SolidBrush(m_lineColor), pathLine);
             m_trackRectangle = new RectangleF(m_lineRectangle.Left - lineWidth + (((float)m_value / (float)(maxValue - minValue)) * (this.Size.Width - lineWidth * )), (this.Size.Height - lineWidth * ) / , lineWidth * , lineWidth * );
             g.FillEllipse(new SolidBrush(m_lineColor), m_trackRectangle);
             g.FillEllipse(Brushes.White, new RectangleF(m_trackRectangle.X + m_trackRectangle.Width / , m_trackRectangle.Y + m_trackRectangle.Height / , m_trackRectangle.Width / , m_trackRectangle.Height / ));
         }
     }
 }

最后的话

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