In this chapter, we covered something that inevitably comes up when making GUI applications—scrolling a window. 

We saw that in order to scroll a window we need to use a widget that supports it, such as a Canvas widget. The advantage of the Canvas widget is that we can use the create_window method to insert other widgets inside of it to act as windows. These windows function as their regular widget, and are then able to be scrolled.

Speaking of creating widgets inside others, we also learned how to add images inside a Text widget by using the image_create method. This method only needs the index at which to create the image and a PhotoImage instance.

The design implementation for our chat application has been considered, and the necessary windows and widgets are all in place and ready to connect.

We have now practiced using one of the alternate geometry managers—grid. We have seen how easily this allows us to lay out our widgets in an even grid, and we also saw how to make the grid expand...