如何检测鼠标何时离开表单? [英] How to detect when the mouse leaves the form?

问题描述

我有一个表单，上面有很多控件.如何检测鼠标何时离开表单?我已经尝试为每个控件和表单连接一个 MouseLeave 事件，但这不起作用，因为这些事件在鼠标经过控件时一直触发.有没有实际可行的方法.

I have a form with a lot of controls on it. How can I detect when the mouse leaves the form? I've tried wiring up a MouseLeave event for every single control and the form, but that does not work because those events fire all the time as the mouse passes over controls. Is there a way that actually works.?

推荐答案

你应该听:

• 表单所有控件的MouseLeave事件
• 表单的鼠标离开事件

只需将您的侦听器链接到一个函数，该函数检查光标是否在客户端的表单中.

Just link your listeners to a function that checks whether the cursor is in the forms client are or not.

试试这个:

    protected override void OnControlAdded(ControlEventArgs e)
    {
        SubscribeEvents(e.Control);
        base.OnControlAdded(e);
    }

    protected override void OnControlRemoved(ControlEventArgs e)
    {
        UnsubscribeEvents(e.Control);
        base.OnControlRemoved(e);
    }

    private void SubscribeEvents(Control control)
    {
        control.MouseLeave += new EventHandler(control_MouseLeave);
        control.ControlAdded += new ControlEventHandler(control_ControlAdded);
        control.ControlRemoved += new ControlEventHandler(control_ControlRemoved);

        foreach (Control innerControl in control.Controls)
        {
            SubscribeEvents(innerControl);
        }
    }

    private void UnsubscribeEvents(Control control)
    {
        control.MouseLeave -= new EventHandler(control_MouseLeave);
        control.ControlAdded -= new ControlEventHandler(control_ControlAdded);
        control.ControlRemoved -= new ControlEventHandler(control_ControlRemoved);

        foreach (Control innerControl in control.Controls)
        {
            UnsubscribeEvents(innerControl);
        }
    }

    private void control_ControlAdded(object sender, ControlEventArgs e)
    {
        SubscribeEvents(e.Control);
    }

    private void control_ControlRemoved(object sender, ControlEventArgs e)
    {
        UnsubscribeEvents(e.Control);
    }

    protected override void OnMouseLeave(EventArgs e)
    {
        CheckMouseLeave();
        base.OnMouseLeave(e);
    }

    private void control_MouseLeave(object sender, EventArgs e)
    {
        CheckMouseLeave();
    }

    private void CheckMouseLeave()
    {
        Point pt = PointToClient(Cursor.Position);

        if (ClientRectangle.Contains(pt) == false)
        {
            OnMouseLeftFrom();
        }
    }

    private void OnMouseLeftFrom()
    {
        Console.WriteLine("Mouse left the form");
    }

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