调整控件大小和位置时限制位置就是调整大小时

调整控件的大小和位置时限制位置

在移动控件并调整控件的大小时，请将控件限制在某个区域，此处的限制区域位于面板内部

在此处查看移动控件的源代码

模仿表单设计以在运行时调整控件的大小和位置

达到效果：

1.控件移动区域只能在面板内部移动

2.移动控件时，鼠标光标移动区域是面板，停止移动时，鼠标光标移动区域是整个屏幕。

这需要设置Cursor.Clip属性

停止移动时，鼠标光标移动区域将设置为整个屏幕

Cursor.Clip = SystemInformation.VirtualScreen;

这包括调整大小时，即移动FrameControl时，还必须限制鼠标光标以移动区域

代码

public class MoveControlHelper
{
    //移动控件
    public Control ctrl;
    //移动控件的父级控件
    public static Control ctrlParent;
    //获取父级控件的位置和大小(采用屏幕坐标)
    public static Func GetCtrlParentClipWhereMouseDown;
    public void SetCtrlLimit(Control ctrl)
    {
        this.ctrl = ctrl;
        ctrl.SetMove();
        ctrl.MouseDown += Ctrl_MouseDown;
        ctrl.MouseMove += Ctrl_MouseMove;
        ctrl.Resize += Ctrl_Resize;
        ctrl.MouseUp += Ctrl_MouseUp;
    }
    //获取边框控件
    private FrameControl GetFrameControl()
    {
        foreach (Control item in ctrlParent?.Controls)
        {
            if (item is FrameControl frameControl && frameControl.Visible == true)
            {
                return frameControl;
            }
        }
        return null;
    }
    //鼠标按下时
    private  void Ctrl_MouseDown(object sender, MouseEventArgs e)
    {
        Rectangle ctrlParentRect = GetCtrlParentClipWhereMouseDown.Invoke();
        //鼠标按下时，限制鼠标光标移动区域为移动控件的父级控件
        Cursor.Clip = ctrlParentRect;
        //如果是边框控件，则不再绑定事件
        if (sender is FrameControl)
        {
            return;
        }
        FrameControl frameControl = GetFrameControl();
        if (frameControl != null)
        {
            //清除绑定
            frameControl.MouseDown -= Ctrl_MouseDown;
            frameControl.MouseUp -= Ctrl_MouseUp;
            //重新绑定
            frameControl.MouseDown += Ctrl_MouseDown;
            frameControl.MouseUp += Ctrl_MouseUp;
        }
    }
    //移动时
    private  void Ctrl_MouseMove(object sender, MouseEventArgs e)
    {
        Control ctrl = (Control)sender;
        SetCtrlLoc(ctrl);
    }
    //调整大小时
    private void Ctrl_Resize(object sender, EventArgs e)
    {
        Control ctrl = (Control)sender;
        SetCtrlLoc(ctrl);
        SetCtrlSize(ctrl);
    }
    //释放鼠标时
    private  void Ctrl_MouseUp(object sender, EventArgs e)
    {
        //鼠标释放时，鼠标光标移动区域为整个屏幕
        Cursor.Clip = SystemInformation.VirtualScreen;
    }
    /// 

    /// 限制控件位置
    /// 
    private  void SetCtrlLoc(Control ctrl)
    {
        //左边
        if (ctrl.Location.X <= 0)
        {
            ctrl.Location = new Point(0, ctrl.Location.Y);
        }
        //上边
        if (ctrl.Location.Y <= 0)
        {
            ctrl.Location = new Point(ctrl.Location.X, 0);
        }
        //右边
        if (ctrl.Location.X + ctrl.Width >= ctrlParent.Width)
        {
            ctrl.Location = new Point(ctrlParent.Width - ctrl.Width, ctrl.Location.Y);
        }
        //下边
        if (ctrl.Location.Y + ctrl.Height >= ctrlParent.Height)
        {
            ctrl.Location = new Point(ctrl.Location.X, ctrlParent.Height - ctrl.Height);
        }
    }
    /// 

    /// 限制控件大小
    /// 
    private  void SetCtrlSize(Control ctrl)
    {
        if (ctrl.Height >= ctrlParent.Height - 5)
            ctrl.Height = ctrlParent.Height - 5;
        if (ctrl.Width >= ctrlParent.Width - 5)
            ctrl.Width = ctrlParent.Width - 5;
    }
}

实现

MoveControlHelper.ctrlParent = panel1;
MoveControlHelper.GetCtrlParentClipWhereMouseDown += () =>
    new Rectangle(new Point(MoveControlHelper.ctrlParent.Location.X + Location.X + 8, 
    MoveControlHelper.ctrlParent.Location.Y + Location.Y + 8 + SystemInformation.CaptionHeight),
    MoveControlHelper.ctrlParent.Size);
MoveControlHelper moveControlHelper = new MoveControlHelper();
moveControlHelper.SetCtrlLimit(label1);
moveControlHelper.SetCtrlLimit(button1);

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