Programming Python, 3rd Edition

9.1. "Widgets and Gadgets and GUIs, Oh My!" This chapter is a continuation of our look at GUI programming in Python. The previous chapter used simple widgetsbuttons, labels, and the liketo demonstrate the fundamentals of Tkinter coding in Python. ...

9.2. Configuring Widget Appearance So far, all the buttons and labels in examples have been rendered with a default look-and-feel that is standard for the underlying platform. With my machine's color sch...

9.3. Top-Level Windows Tkinter GUIs always have a root window, whether you get it by default or create it explicitly by calling the Tk object constructor. This main root window is the one that opens when your program runs, a...

9.4. Dialogs are windows popped up by a script to provide or request additional information. They come in two flavors, modal and nonmodal: Modal These dialogs block the rest of the interface until the dialog w...

9.5. Binding Events We met the bind widget method in the prior chapter, when we used it to catch button presses in the tutorial. Because bind is commonly used in conjunction with other widgets (e.g., to catch return key presses for inpu...

9.6. Message and Entry The widgets allow for display and input of simple text. Both are essentially functional subsets of the Text widget we'll meet later; Text can do everythi...

9.7. Checkbutton, Radiobutton, and Scale This section introduces three widget types: the Checkbutton (a multiple-choice input widget), the Radiobutton (a single-choice device), and the Scale (sometimes known as a "slider"...

9.8. Running GUI Code Three Ways Now that we've built a handful of similar demo launcher programs, let's write a few top-level scripts to combine them. Because the demos were coded as both reusable classes and scripts, they can be deployed as...

9.9. Images In Tkinter, graphical images are displayed by creating independent PhotoImage or BitmapImage objects, and then attaching those image objects to other widgets via image attribute settings. Buttons, labels, canvases, tex...

9.10. Viewing and Processing Images with PIL As mentioned earlier, Python Tkinter scripts show images by associating independently created image objects with real widget objects. At this writing, Tkinter GUIs can display photo image files in GIF, ...