辛苦半天做出来的，如果觉得好用，记得点赞
效果图如下：
具体操作：
1 、添加代码（代码在下面），重新生成下整个工程，在工具栏中就出现控件，将控件拖到窗体中
2、只需要调整这些参数就行
- 常用事件
-
下面是代码 ，直接复制，将顶部 namespace 名改成你的工程名称就能用了 。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace 视频下载和播放
{
public class LTrackBar : Control
{
public LTrackBar()
{
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
CreateControl();
}[Category("DemoUI"), Description("背景条颜色")] /// <summary> /// 未滑按钮 /// </summary> private Color _BarButtonColor = Color.FromArgb(0, 0, 200); // 浅绿色 public Color L_BarButtonColor { get { return _BarButtonColor; } set { _BarButtonColor = value; Invalidate(); } } /// <summary> /// 未滑过的区域颜色 /// </summary> private Color _BarColor = Color.FromArgb(128, 255, 128); // 浅绿色 public Color L_BarColor { get { return _BarColor; } set{ _BarColor = value; Invalidate(); } } /// <summary> /// 已滑过的区域颜色 /// </summary> private Color _SliderColor = Color.FromArgb(0, 200, 0); // 浅绿色 public Color L_SliderColor { get { return _SliderColor; } set { _SliderColor = value; Invalidate(); } } /// <summary> /// 圆角 /// </summary> private bool _IsRound = true; public bool L_IsRound { get { return _IsRound; } set { _IsRound = value; Invalidate(); } } /// <summary> /// 最小值 /// </summary> private int _Minimum = 0; public int L_Minimum { get { return _Minimum; } set { _Minimum = Convert.ToInt32(value); if (_Minimum >= _Maximum) { _Minimum = _Maximum - 1; } if (_Minimum < 0) { _Minimum = 0; } if (_Value < _Minimum) { _Value = _Minimum; } Invalidate(); } } /// <summary> /// 最大值 /// </summary> private int _Maximum = 100; public int L_Maximum { get { return _Maximum; } set { _Maximum = Convert.ToInt32(value); if (_Minimum >= _Maximum) { _Maximum = _Minimum + 1; } if (_Value > _Minimum) { _Value = _Minimum; } Invalidate(); } } /// <summary> /// 添加 滑块值改变 委托事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> public delegate void LValueChangedEventHandler(object sender, LEventArgs e); public event LValueChangedEventHandler LValueChanged; /// <summary> /// 滑块的当前值 /// </summary> private int _Value = 0; public int L_Value { get { return _Value; } set { _Value = value; if (_Value > _Maximum) { _Value = _Maximum; } if (_Value < _Minimum) { _Value = _Minimum; } Invalidate(); LValueChanged?.Invoke(this, new LEventArgs(_Value)); } } /// <summary> /// 滑块的方向 /// </summary> private Orientation _Orientation = Orientation.Horizontal_LR; public Orientation L_Orientation { get { return _Orientation; } set { Orientation old = _Orientation; _Orientation = value; if (old != _Orientation) { Size = new Size(Size.Height, Size.Width); } } } /// <summary> /// 滑块的高度 /// </summary> private int _BarSize = 10; public int L_BarSize { get { return _BarSize; } set { _BarSize = value; if (_BarSize < 3) _BarSize = 3; if (_Orientation == Orientation.Horizontal_LR) { Size = new Size(Width , _BarSize); } else { Size = new Size(_BarSize,Height); } } } /// <summary> /// 实现只能调整宽度/高度，需要重写SetBoundsCore方法 /// </summary> protected override void SetBoundsCore(int x, int y, int width, int height, BoundsSpecified specified) { if (_Orientation == Orientation.Horizontal_LR) base.SetBoundsCore(x, y, width, _BarSize, specified); else base.SetBoundsCore(x, y, _BarSize, height, specified); } MouseStatus mouseStatus; private PointF mousePoint; /// <summary> /// 尺寸变化是刷新 /// </summary> /// <param name="e"></param> protected override void OnSizeChanged(EventArgs e) { base.OnSizeChanged(e); Invalidate(); } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); pValueToPoint(); e.Graphics.SmoothingMode = SmoothingMode.HighQuality; float barSizeRatio = 0.7f; if (_BarSize < 15) barSizeRatio = 0.5f; Pen penBarBack = new Pen(_BarColor, _BarSize * barSizeRatio); Pen penBarFore = new Pen(_SliderColor, _BarSize * barSizeRatio); float fCapWidth = _BarSize; float fCapHalfWidth = _BarSize / 2.0f; if (_IsRound) { penBarBack.StartCap = LineCap.Round; penBarBack.EndCap = LineCap.Round; penBarFore.StartCap = LineCap.Round; penBarFore.EndCap = LineCap.Round; } float fPointValue = 0; if (_Orientation == Orientation.Horizontal_LR) { e.Graphics.DrawLine(penBarBack, fCapHalfWidth, Height / 2f, Width - fCapHalfWidth, Height / 2f); fPointValue = mousePoint.X; if (fPointValue < fCapHalfWidth) fPointValue = fCapHalfWidth; if (fPointValue > Width - fCapHalfWidth) fPointValue = Width - fCapHalfWidth; } else { e.Graphics.DrawLine(penBarBack, Width / 2f, fCapHalfWidth, Width / 2f, Height - fCapHalfWidth); fPointValue = mousePoint.Y; if (fPointValue < fCapHalfWidth) fPointValue = fCapHalfWidth; if (fPointValue > Height - fCapHalfWidth) fPointValue = Height - fCapHalfWidth; } Brush brush = new SolidBrush(_BarButtonColor); if (_Orientation == Orientation.Horizontal_LR) { e.Graphics.DrawLine(penBarFore, fCapHalfWidth, Height / 2f, fPointValue, Height / 2f); e.Graphics.FillEllipse(brush, fPointValue - fCapHalfWidth, Height / 2f - fCapHalfWidth, fCapWidth-1, fCapWidth-1); } else { e.Graphics.DrawLine(penBarFore, Width / 2f, fPointValue, Width / 2f, Height - fCapHalfWidth); e.Graphics.FillEllipse(brush, Width / 2f - fCapHalfWidth, fPointValue - fCapHalfWidth, fCapWidth-1, fCapWidth - 1); } } private void pValueToPoint() { float fCapWidth = _BarSize; float fCapHalfWidth = _BarSize / 2.0f; float fRatio = Convert.ToSingle(_Value - _Minimum) / (_Maximum - _Minimum); if (_Orientation == Orientation.Horizontal_LR) { float fPointValue = fRatio * (Width - fCapWidth) + fCapHalfWidth; mousePoint = new PointF(fPointValue, fCapHalfWidth); } else { float fPointValue = Height - fCapHalfWidth - fRatio * (Height - fCapWidth); mousePoint = new PointF(fCapHalfWidth, fPointValue); } } protected override void OnMouseDown(MouseEventArgs e) { mouseStatus = MouseStatus.Down; mousePoint = e.Location; pPointToValue(); Invalidate(); base.OnMouseDown(e); } protected override void OnMouseUp(MouseEventArgs e) { mouseStatus = MouseStatus.Up; base.OnMouseUp(e); } protected override void OnMouseMove(MouseEventArgs e) { if (mouseStatus == MouseStatus.Down) { mousePoint = e.Location; pPointToValue(); Invalidate(); } base.OnMouseMove(e); } protected override void OnMouseEnter(EventArgs e) { mouseStatus = MouseStatus.Enter; base.OnMouseEnter(e); } protected override void OnMouseLeave(EventArgs e) { mouseStatus = MouseStatus.Leave; base.OnMouseLeave(e); } /// <summary> /// 计算滑块位置 /// </summary> private void pPointToValue() { float fCapHalfWidth = 0; float fCapWidth = 0; if (_IsRound) { fCapWidth = _BarSize; fCapHalfWidth = _BarSize * 0.5f; } // 计算滑块的位置 if (_Orientation == Orientation.Horizontal_LR) { float fRatio = Convert.ToSingle(mousePoint.X - fCapHalfWidth) / (Width - fCapWidth); _Value = Convert.ToInt32(fRatio * (_Maximum - _Minimum) + _Minimum); } else { float fRatio = Convert.ToSingle(Height - mousePoint.Y - fCapHalfWidth) / (Height - fCapWidth); _Value = Convert.ToInt32(fRatio * (_Maximum - _Minimum) + _Minimum); } if (_Value < _Minimum) _Value = _Minimum; else if (_Value > _Maximum) _Value = _Maximum; LValueChanged?.Invoke(this, new LEventArgs(_Value)); } } public class LEventArgs : EventArgs { public LEventArgs(object value) { Value = value; } public object Value { get; set; } } /// <summary> /// 控件方向 /// </summary> public enum Orientation { /// <summary> /// 水平方向 （从左到右） /// </summary> Horizontal_LR, / <summary> / 水平方向 （从右到左） / </summary> //Horizontal_RL, /// <summary> /// 垂直方向 （从下到上） /// </summary> Vertical_BT, / <summary> / 垂直方向 （从上到下） / </summary> //Vertical_TB, } /// <summary> /// 鼠标状态 /// </summary> public enum MouseStatus { /// <summary> /// 鼠标进入 /// </summary> Enter, /// <summary> /// 鼠标离开 /// </summary> Leave, /// <summary> /// 鼠标按下 /// </summary> Down, /// <summary> /// 鼠标放开 /// </summary> Up }}