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In this chapter, you have learned about the following nine new widgets that provide you with a meaningful way to interact with your users: GtkToggleButton: A type of GtkButton widget that holds its active or inactive state after it is clicked. It is shown as pressed down when it is active. GtkCheckButton: Derived from GtkToggleButton, this widget is drawn as a discrete toggle next to the displayed text. This allows it to be differentiated from a GtkButton. GtkRadioButton: You can group multiple radio button widgets together so that only one toggle can be activated at once. GtkEntry: This widget allows the user to enter free-form text on a single line. It also facilitates password entry. GtkSpinButton: Derived from GtkEntry, spin buttons allow the user to select or enter an integer or floating-point number within a predefined range. GtkScale: Similar to the spin button, this widget allows the user to select an integer or floating-point number by moving a vertical or horizontal slider. GtkColorButton: This special type of button allows the user to select a specific color along with an optional alpha value. GtkFileChooserButton: This special type of button allows the user to select a single file or folder that already exists on the system. GtkFontButton: This special type of button allows the user to select a font family, style, and size. In the next chapter, you will learn how to create your own custom dialogs using the GtkDialog class and about a number of dialogs that are built into GTK+. By the end of 5, you will have a decent grasp of the most important simple widgets available to you in GTK+. From there, we will continue on to more complex topics.

The first TAB would complete the /h to make it /home/ because no other subdirectories of the root directory begin with h. The second TAB would complete the /home/rb entry to /home/rbpeters. Pressing Enter then executes the command.

to apply the MouseDragElementBehavior Behavior to. Do that now so that you have what I have in Figure 7-8.

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his chapter introduces you to a special type of window called a dialog. Dialogs are windows that supplement the top-level window. The dialog is provided by GtkDialog, a child class of GtkWindow, extended with additional functionality. This means it is possible to implement your entire interface in one or more dialogs, while leaving the main window hidden. You can do anything with a dialog, such as display a message or prompt the user to select an option. Their purpose is to enhance user experience by providing some type of transient functionality. In the first part of the chapter, you will learn how to use GtkDialog to create your own custom dialogs. The next section will introduce you to the large number of built-in dialogs provided by GTK+. Lastly, you will learn about a widget called GtkAssistant that allows you to create dialogs with multiple pages; assistants are meant to help the user through a multistage process. In this chapter, you will learn the following: How to create your own custom dialogs using the GtkDialog widget How to give general information, error messages, and warnings to the user with the GtkMessageDialog widget How to provide information about your application with GtkAboutDialog What types of file chooser dialogs are available The ways to collect information with font and color selection dialogs How to create dialogs with multiple pages using the GtkAssistant widget

ne of the advantages of working at the shell command line is that you re working in a shell. That sounds sort of obvious and dumb, but please bear with me; pretty much anything you can do in a shell script, you can also do from the command line. I ve coded many ad hoc scripts right at the command line. I wouldn t recommend writing anything significant that way, but for quickies it s just the ticket. If you start a loop or conditional, such as a while, for, or if/then statement, while working at the shell prompt, the command line is extended until you have finished the steps in the code block. In a traditional script, such code would customarily span several lines in a file. Here is a typical interaction with the shell when entering code directly from the command line:

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