如何测试窗口当前的焦点 [英] How to test if window is currently focused

问题描述

有没有一种方法可以测试一个窗口当前的焦点？我知道我可以通过在窗口中激活的addEventListener来实现这一点，并使用全局变量来跟踪它，但事情是我需要测试我的插件启动时，所以这是一个机会添加任何事件侦听器。

执行窗口== Services.wm.getMostRecentWindow（null）将不起作用，因为其他应用程序窗口可能已经结束它。所以我想我需要知道如果firefox是当前最顶层的窗口。

tldr：我需要测试当前窗口是否集中，意味着不只是任何其他firefox窗口，但在操作系统上的所有窗口。

解决方案

使用附加sdk：

  require（sdk / window / utils）。isFocused（window）
  

没有加载项sdk：

$ p $ function isFocused（window）{
const FM = Cc [@ mozilla.org/focus-manager;1]。
getService（Ci.nsIFocusManager）;

let childTargetWindow = {};
FM.getFocusedElementForWindow（window，true，childTargetWindow）;
childTargetWindow = childTargetWindow.value;

let focusedChildWindow = {};
if（FM.activeWindow）{
FM.getFocusedElementForWindow（FM.activeWindow，true，focusedChildWindow）;
focusedChildWindow = focusedChildWindow.value;
}

return（focusedChildWindow === childTargetWindow）;
}

isFocused（window）;


Is there a way to test if a window is currently focused? I know I can do this with addEventListener of activated on the window, and use a global var to track it, but the thing is I need to test this on startup of my addon, so this is before a chance to add any event listeners.

Doing window == Services.wm.getMostRecentWindow(null) will not work because other application windows may be over it. So I guess I need to know if firefox is the currently top most window.

tldr: I need to test if the current window is focused, meaning not just of any other firefox windows, but of all windows on the OS.

解决方案

With the add-on sdk:

require("sdk/window/utils").isFocused(window)

Without the add-on sdk:

function isFocused(window) {
  const FM = Cc["@mozilla.org/focus-manager;1"].
                getService(Ci.nsIFocusManager);

  let childTargetWindow = {};
  FM.getFocusedElementForWindow(window, true, childTargetWindow);
  childTargetWindow = childTargetWindow.value;

  let focusedChildWindow = {};
  if (FM.activeWindow) {
    FM.getFocusedElementForWindow(FM.activeWindow, true, focusedChildWindow);
    focusedChildWindow = focusedChildWindow.value;
  }

  return (focusedChildWindow === childTargetWindow);
}

isFocused(window);

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