C#自定义进度条，可用于音乐播放器进度调整，音量调整等功能

平时在做c#项目时偶尔会碰到要使用进度条的情况，但c#自带的进度条外观往往不合我们心意，这就需要我们自己动手来只做一款自己的进度条。先上图：

      

外观虽然简单，但感觉比c#自带的好看多了。

绘制这样一个进度条需要两个基本控件，两个Label，一个picturebox，下面是myProgressBar类的代码

 public class myProgressBar
    {
        public PictureBox picFocus;
        public Label lbltop;
        public Label lblbottom;
        int value = 0;
        int x1;
        int y1;
        int h1;
        int w1;
        Form f1;

        public myProgressBar(Form f, int x, int y, int width, int high)
        {
            //绘制进度条，用两个label以及一个picturebox组合为进度条
            lblbottom = new Label();
            lbltop = new Label();
            lblbottom.BackColor = Color.Gray;
            lbltop.BackColor = Color.Yellow;

            //进度条上的光标
            picFocus = new PictureBox();
            picFocus.Size = new Size(high+6, high+6 );
            picFocus.Location = new Point(x + value, y - 3);
            picFocus.BackgroundImage = Image.FromFile("yellowyuan.png");
            picFocus.BackgroundImageLayout = ImageLayout.Stretch;
            picFocus.BackColor = Color.Transparent;

            lblbottom.SetBounds(x, y, width, high);
            lbltop.Size = new Size(value, high);
            lblbottom.Controls.Add(lbltop);
            f.Controls.Add(picFocus);
            f.Controls.Add(lblbottom);

            x1 = x;
            y1 = y;
            h1 = high;
            w1 = width;
            f1 = f;

        }
        public void updateFocus(int value)
        {
            picFocus.Location = new Point(x1 + value, y1 - 3);
            lbltop.Size = new Size(value, h1);
        }


        //进度条拖动
        Point clickPoint;
        public bool isDrag;
        internal void picFocus_MouseDown(object sender, MouseEventArgs e)
        {
                isDrag = true;
                clickPoint = new Point(e.X, e.Y);
        }

        int offsetX;
        internal void picFocus_MouseMove(object sender, MouseEventArgs e)
        {
            if (isDrag)
            {
                offsetX = e.X - clickPoint.X;

                //若进度条没有超出可拖动范围
                if (picFocus.Location.X >= lblbottom.Location.X && picFocus.Location.X <= lblbottom.Location.X + w1 - picFocus.Width)
                {
                    picFocus.Location = new Point(picFocus.Location.X + offsetX, picFocus.Location.Y);
                }
                //若进度条超出最小范围，将他置于最小位置
                if (picFocus.Location.X < lblbottom.Location.X)
                {
                    picFocus.Location = new Point(lblbottom.Location.X, picFocus.Location.Y);
                }
                //若进度条超出最大范围，将他置于最大位置
                if (picFocus.Location.X > lblbottom.Location.X + w1 - picFocus.Width)
                {
                    picFocus.Location = new Point(lblbottom.Location.X + w1 - picFocus.Width, picFocus.Location.Y);
                }
                //改变lbltop长度
                int value = picFocus.Location.X - lblbottom.Location.X;
                this.updateFocus(value);
            }
        }

        internal void picFocus_MouseUp(object sender, MouseEventArgs e)
        {
            isDrag = false;
        }

然后在Form中添加load事件，并填写如下代码：

 private void Form1_Load(object sender, EventArgs e)
        {
            //生成进度条
            myProgressBar mbp = new myProgressBar(this,200,200,200,8);
            this.Controls.Add(mbp.picFocus);
            this.Controls.Add(mbp.lblbottom);
            //注册进度条拖动事件
            mbp.picFocus.MouseDown += new MouseEventHandler(mbp.picFocus_MouseDown);
            mbp.picFocus.MouseMove += new MouseEventHandler(mbp.picFocus_MouseMove);
            mbp.picFocus.MouseUp += new MouseEventHandler(mbp.picFocus_MouseUp);

        }

OK，大功告成！