C# - 将控件移动到鼠标位置

Question

当用户单击并拖动控件时,我试图让控件跟随光标.问题是1.)控制器不会移动到鼠标的位置,以及2.)控制器在整个地方闪烁和飞行.我尝试了几种不同的方法,但到目前为止都失败了.

我试过了:

protected override void OnMouseDown(MouseEventArgs e)
{
     while (e.Button == System.Windows.Forms.MouseButtons.Left)
     {
          this.Location = e.Location;
     }
}

和

protected override void OnMouseMove(MouseEventArgs e)
{
     while (e.Button == System.Windows.Forms.MouseButtons.Left)
     {
          this.Location = e.Location;
      }
}

但这些都不奏效.任何帮助表示赞赏,并提前感谢!

Answer 1

这是怎么做的:

private Point _Offset = Point.Empty;

protected override void MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        _Offset = new Point(e.X, e.Y);
    }
}

protected override void MouseMove(object sender, MouseEventArgs e)
{
    if (_Offset != Point.Empty)
    {
        Point newlocation = this.Location;
        newlocation.X += e.X - _Offset.X;
        newlocation.Y += e.Y - _Offset.Y;
        this.Location = newlocation; 
    }
}

protected override void MouseUp(object sender, MouseEventArgs e)
{
    _Offset = Point.Empty;
}

_Offset 这里使用的目的有两个:跟踪最初点击鼠标时控件上鼠标的位置,并跟踪鼠标按钮是否关闭(这样当鼠标光标时控件不会被拖动)过去了,按钮没有关闭).

你绝对不希望if将此代码中的whiles 切换为s,因为它会产生影响.