composition window

基本解释

An obvious example is the input method composition window.
一个明显的示例是输入法合成窗口。
To ensure that the composition window updates its appearance based on these changes, the function allows you to send a notification message to the window.
为了确保字母组合窗口已经根据这些改变更新了它的外观显示，函数允许你向窗口发送一个通知消息。
Clearly, you want the input method composition window (shown below) to be left out of the focus traversal cycle, hence the use of Window.setFocusableWindow(false).
很明显，您希望焦点遍历循环不包括输入法合成窗口（如下所示），因此使用 Window.setFocusableWindow(false) 。