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One important characteristic of containers is that each container can hold other containers. To really drive this point home, in this example, you will use a large number of containers. The main window will show a GtkNotebook and two buttons along the bottom. The notebook should have four pages. Each notebook page should hold a GtkButton that moves to the next page (The GtkButton on the last page should wrap around to the first page.) Create two buttons along the bottom of the window. The first should move to the previous page in the GtkNotebook, wrapping to the last page if necessary. The second button should close the window and exit the application when clicked.

1. Copy and paste the Ellipse with the black fill. 2. Give it a Gradient fill. 3. Change the Gradient to go from white to white. 4. Select the right color stop and change the Alpha value to 0%. 5. Use the resize handles and make the Ellipse a little smaller and a little oblong so that you

This case structure is what allows multiple command names to work. If the name of the command is root_check, we set the fs variable to the / file system. If it is boot_check, we set the fs variable to /boot, and so on. The following example sets only one value in each case, but it could just as easily change many more elements, depending on your needs:

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Exercise 3-1 is a simple application to implement, but it illustrates a few important points. First, it shows the usefulness of GtkVBox and GtkHBox, and how they can be used together to create complex user interfaces. It is true that this same application could be implemented with a GtkTable as the direct child of the window, but it is significantly easier to align the buttons along the bottom with a horizontal box. You will notice that the buttons were packed at the end of the box, which aligns them to the right side of the box, and this is easier to implement with boxes. Also, you saw that containers can, and should, be used to hold other containers. For example, in Exercise 3-1, a GtkWindow holds a GtkVBox, which holds a GtkHBox and a GtkNotebook. This structure can become even more complex as your application grows in size. Once you have completed Exercise 3-1, move on to Exercise 3-2. In the next problem, you will use the paned container instead of a vertical box.

have something like Figure 6-49.

case $whatami in root_check) fs="/" ;; boot_check) fs="/boot" ;; snap_check) fs="/snapshot" ;; *) echo "Don't know what to do. Exiting" ;; esac

In this exercise, you will expand upon the code you wrote in Exercise 3-1. Instead of using a GtkVBox to hold the notebook and horizontal box of buttons, create a GtkVPaned widget. In addition to this change, you should hide the GtkNotebook tabs, so the user is not able to switch between pages without pressing buttons. In this case, you will not be able to know when a page is being changed. Therefore, each button that is in a GtkNotebook page should be contained by its own expander. The expander labels will allow you to differentiate between notebook pages.

Figure 6-49. Give the topmost Ellipse a Gradient with the right color stop with an Alpha of 0. You still need to tweak the Gradient a bit to get the effect we are looking for.

Once you have completed Exercise 3-2, you will have had practice with GtkBox, GtkPaned, GtkNotebook, and GtkExpander four important containers that will be used throughout the rest of this book. Before continuing on to the next chapter, you may want to test out a few of the containers covered in this chapter that you did not need for Exercises 3-1 and 3-2. This will give you practice using all of the containers, because later chapters will not review past information.

fs_total=`df -k $fs | tail -n 1 | awk '{print $2}'` fs_used=`df -k $fs | tail -n 1 | awk '{print $3}'` percent_used=$((100*$fs_used/$fs_total)) echo "$fs is at ${percent_used}% capacity"

1. Select the Gradient tool, as I am doing in Figure 6-50.

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