C#窗体移动事件学习

#region C#窗体移动事件

    private Point mouseOff;//鼠标移动位置变量
    private bool leftFlag;//标签是否为左键
    private void Frm_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            mouseOff = new Point(-e.X, -e.Y); //得到变量的值
            leftFlag = true;                  //点击左键按下时标注为true;
        }
    }
    private void Frm_MouseMove(object sender, MouseEventArgs e)
    {
        if (leftFlag)
        {
            Point mouseSet = Control.MousePosition;
            mouseSet.Offset(mouseOff.X, mouseOff.Y);  //设置移动后的位置
            Location = mouseSet;
        }
    }
    private void Frm_MouseUp(object sender, MouseEventArgs e)
    {
        if (leftFlag)
        {
            leftFlag = false;//释放鼠标后标注为false;
        }
    }

    #endregion