# X Concepts Let me review some X window definitions and concepts in order to avoid confusion with the terms used here, including top-level window. Some of this information is taken from “Tcl and the Tk Toolkit” by John K. Ousterhout. “The X Window System provides facilities for manipulating windows on displays. … Each screen displays a hierarchical collection of rectangular windows, starting with a ‘root window’ that covers the entire area of the screen. The root window may have any number of child windows, each of which is called a ‘top-level window’. An X application typically manages several top-level windows, one for each of the application’s major panels and dialogs.” One can also speak of an application’s ‘root’ top-level window. This is the terminology from Grayson’s book. John Grayson’s “Python and Tkinter Programming”, Manning, 2000 让我回顾一些X窗口定义和概念，以避免与此处使用的术语（包括顶层窗口）混淆。 其中一些信息来自John K. Ousterhout的“ Tcl and Tk Toolkit”。 “ X窗口系统提供了操作显示器窗口的工具。 …每个屏幕都显示矩形窗口的分层集合，从覆盖整个屏幕区域的“根窗口”开始。 根窗口可以具有任意数量的子窗口，每个子窗口都称为“顶层窗口”。 X应用程序通常管理几个顶级窗口，每个应用程序的主要面板和对话框都一个。”也可以称为应用程序的“根”顶级窗口。 这是格雷森著作中的术语。 John Grayson的“ Python和Tkinter编程”，曼宁，2000年