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Whether you are an expert or a novice, we all make mistakes. Because of this, you should always forgive your users. After all, everyone has at one time or another pressed an incorrect button that resulted in losing a large amount of work. In a properly designed application, this should never occur. For basic actions that cannot be easily undone by the user, you should provide the ability to undo the action. For example, these basic actions could include deleting an item from our Grocery List application or moving text within a text view. For actions that cannot be undone, you should always provide a confirmation dialog. It should explicitly state that this action cannot be undone and ask whether the user wants to continue. For example, you should always ask the user whether the application should be closed when there are documents with unsaved changes. People have been using software for years and have come to expect a confirmation dialog box for actions that cannot be undone.
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CHAPTER 10 DYNAMIC USER INTERFACES
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The Glade User Interface Builder
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One factor that can make or break a GUI toolkit is whether it can be used to rapidly deploy applications. While the user interface is extremely important to the success of an application, it should not be the most consuming aspect of the development process. Glade is a tool that allows you to quickly and efficiently design graphical user interfaces so that you can move onto other aspects of your code. User interfaces are saved as an XML file that describes the widget structure, the properties of each widget, and any signal handlers you associated with each. Libglade can then load the user interface file in order to dynamically build it on application load. This allows you to alter the user interface aesthetically without the need to recompile the application.
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Note Previous versions of Glade allowed you to generate source code instead of saving the user interface in an XML file. This method is depreciated, because it is difficult to manage when you want to change your user interface. Therefore, you should follow the method provided in this chapter.
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You need to realize from the start what Glade is and what it is not. Glade is used to design the user interface of an application, set up signals that will be associated with callback functions implemented in your code, and take care of common widget properties. However, Glade is not a code editor or an integrated development environment. The files it outputs must be loaded by your application, and you must implement all of the callback functions in your code. Glade is just meant to simplify the process of initializing your application s graphical user interface and connecting signals.
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Tip Glade 3, the version used in this book, now allows integrated development environments such as Anjuta to embed it into their user interfaces. These IDEs provide a complete, start-to-finish solution for deploying GTK+ applications.
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Another advantage of Glade is that, since the user interfaces are stored as XML files, they are independent of the language. Any language that has wrapped the functionality provided by Libglade can load user interfaces. This means that the same graphical user interface designer can be used regardless of the programming language you choose. Before continuing with the rest of this chapter, you should install Glade, Libglade, and the development package for Libglade from your operating system s package manager. Alternatively, you can download and compile the sources from http://glade.gnome.org/. Also, you should make sure to follow along and create this application while reading the rest of the chapter. This will give you a chance to learn your way around the Glade 3 application, so you can get as much practice as possible while you have this book to guide you.
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