c# 鼠标在控件上拖动 移动窗体 移动窗口

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#region 移动窗体 移动窗口

private
Point _mousePoint;

private
int topA(Control cc)

{

    if
(cc == null
|| cc == this) return
0;

    if
(cc.Parent == null
|| cc.Parent == this)

        return
cc.Top;

    else

        return
topA(cc.Parent) + cc.Top;

}

private
int leftA(Control cc)

{

    if
(cc == null
|| cc == this) return
0;

    if
(cc.Parent == null
|| cc.Parent == this)

        return
cc.Left;

    else

        return
leftA(cc.Parent) + cc.Left;

}

private
void labTitle_MouseDown(object
sender, MouseEventArgs e)

{

    Control cc = (Control)sender;

    if
(e.Button == MouseButtons.Left)

    {

        _mousePoint.X = e.X + leftA(cc);

        _mousePoint.Y = e.Y + topA(cc);

    }

}

private
void labTitle_MouseMove(object
sender, MouseEventArgs e)

{

    if
(e.Button == MouseButtons.Left)

    {

        Top = MousePosition.Y - _mousePoint.Y;

        Left = MousePosition.X - _mousePoint.X;

    }

}

#endregion