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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
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Creating Your Own Dialogs
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A dialog is a special type of GtkWindow that is used to supplement the top-level window. It can be used to give the user a message, retrieve information from the user, or provide some other transient type of action. Dialog widgets are split in half by a horizontal separator. The top part is where you place the main part of the dialog s user interface. The bottom half is called the action area, and it holds a collection of buttons. When clicked, each button will emit a unique response identifier that tells the programmer which button was clicked.
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CHAPTER 5 DIALOGS
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In most ways, the dialog widget can be treated as a window, because it is derived from the GtkWindow class. However, when you have multiple windows, a parent-child relationship should be established between the dialog and the top-level window when the dialog is meant to supplement the top-level window. typedef struct { GtkWidget *vbox; GtkWidget *action_area; } GtkDialog; GtkDialog provides two public members that include a horizontal button box called the action area and a vertical box. The action area holds all of the buttons along the bottom of the dialog. You can manually add buttons to this with GtkHButtonBox, but you should usually use the functions provided by GtkDialog for adding action area widgets.
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Note It is possible to manually implement the functionality of GtkDialog by creating a GtkWindow with
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all of the same widgets and establishing window relationships with gtk_window_set_transient_for() in addition to other functions provided by GtkWindow. GtkDialog is simply a convenience widget that provides standard methods.
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Both the action area and a separator are packed at the end of the dialog s vertical box. The GtkVBox (vbox) is used to hold all of the dialog content. Because the action area is packed at the end, you should use gtk_box_pack_start() or gtk_box_pack_start_defaults() to add widgets to a GtkDialog as follows: gtk_box_pack_start_defaults (GTK_BOX (dialog->vbox), child); By packing widgets at the start of the box, the action area and the separator will always remain at the bottom of the dialog.
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Creating a Message Dialog
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One advantage of GtkDialog is that, no matter how complex the content of your dialog is, the same basic concepts can be applied to every dialog. To illustrate this, we will begin by creating a very simple dialog that gives the user a message. Figure 5-1 is a screenshot of this dialog.
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