如何使用浏览器收听窗口的焦点事件? [英] How to listen to focus event of a window with a browser?

问题描述

通过运行此示例:

<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>

<window width="640" height="480"
    xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
    onload="">

    <script>
        <![CDATA[
            function onfocus() {
                dump("FOCUSED!\n");
            }
            window.addEventListener("focus", onfocus, false);
        ]]>
    </script>

    <browser id="gmail" type="content" src="http://gmail.com/" flex="1" />
    <button label="click here to remove the focus from the browser"/>

</window>

..你可以看到 window 的焦点事件仅当焦点不在在 上时才会被抛出浏览器.我在底部添加了一个按钮，因此您可以从浏览器中移除焦点并查看我的意思:

..you can see that the window's focus event will be thrown only if the focus is not on the browser. I added a button in the bottom, so you can remove the focus from the browser and see what I mean:

• 如果 button 获得焦点并且您最小化并恢复窗口，您将看到焦点事件发生.
• 如果 browser 获得焦点并且您最小化并恢复窗口，则焦点事件将不发生.

• If the button is focused and you minimize and restore the window, you'll see the focus event occur.
• If the browser is focused and you minimize and restore the window, the focus event will not occur.

我需要在 browser 获得焦点时发生此焦点事件，知道如何实现此目标吗?

I need this focus event to happen when the browser has the focus, any idea how to accomplish this goal?

推荐答案

尝试改用 activate 事件.

Try using the activate event instead.

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