线程内部会维护当前自己的活动窗口（Active Window）和焦点窗口（Focus Window），焦点窗口其实只是窗口的一个属性，其实就是“焦点状态”是窗口的一个属性，而焦点窗口的顶层窗口就是活动窗口，举个例子：一个...
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Input Focus Window 有输入焦点的窗口
window focus 窗口焦点
Window Focus for mac 窗口管理软件
Window Focus Mac 窗口管理软件
By selecting the most important target area in an image as an auto-focusing evaluation object,the problem that the traditional focus window selection method is not suitable for moving targets can be solved effectively.
选择整幅图像中最重要的目标区域作为自动调焦评价对象,可有效解决传统的对焦窗口选择方法不适合动目标的问题,并可在保证调焦精度的同时有效降低系统的计算量和大大改善自动调焦的效率。
参考来源 - 红外成像自动调焦中动目标对焦窗口选择研究Firstly, three basic elements of auto-focusing are discussed in this paper. They are focus measure, focus window and searching strategy.
首先,本文讨论了自动对焦的三个基本要素,即清晰度评价函数,对焦窗口和搜索策略。
参考来源 - 影像测量仪自动对焦技术的研究与系统开发·2,447,543篇论文数据，部分数据来源于NoteExpress
Each keyboard event is then recorded for the currently in-focus window.
然后将记录当前持有焦点的窗口的每个键盘事件。
This allows the SendKeys command (used later) to send synthetic X window events to the currently in focus window.
这将允许SendKeys命令(稍后使用)把synthetic X Window事件发送给当前持有焦点的窗口。
This is a keyboard trap, because users cannot move the focus to a new window using only the keyboard.
这就是一个键盘陷阱，因为用户无法只用键盘就将焦点移到新窗口中。
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