# 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 讓我回顧一些X窗口定義和概念，以避免與此處使用的術語（包括頂層窗口）混淆。 其中一些信息來自John K. Ousterhout的“ Tcl and Tk Toolkit”。 “ X窗口系統提供了操作顯示器窗口的工具。 …每個屏幕都顯示矩形窗口的分層集合，從覆蓋整個屏幕區域的“根窗口”開始。 根窗口可以具有任意數量的子窗口，每個子窗口都稱為“頂層窗口”。 X應用程序通常管理幾個頂級窗口，每個應用程序的主要面板和對話框都一個。”也可以稱為應用程序的“根”頂級窗口。 這是格雷森著作中的術語。 John Grayson的“ Python和Tkinter編程”，曼寧，2000年