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Drawing DataMatrix in Font DYNAMIC USER INTERFACES

CHAPTER 10 DYNAMIC USER INTERFACES
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The Glade Interface
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When you launch Glade for the first time, you will see three windows: the main window, the widget palette, and the widget property editor. Figure 10-1 is a screenshot of the main Glade application window with a project opened from the file browser.glade.
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Figure 10-1. The main Glade window The main window facilitates Glade project management. The Projects menu shows a list of the currently open projects, allowing you to switch among them. The main window also includes the widget tree view, which shows the widget containment of the project with focus. The widget tree view shows the parent-to-child container relationships within a project. It is possible to have multiple top-level widgets. However, in Figure 10-1, window is the only toplevel widget of the browser.glade project. This window is where you will specify project options, save the project, and load existing projects. The menus in this window also provide many other options that can help you when working with projects, such as undoing and redoing actions.
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Note If you decide to work with Glade 2 instead of Glade 3, make sure to save often. Undo and redo support was not implemented in the older versions of Glade, and it is very frustrating if you accidentally overwrite an hour of work with one wrong mouse click!
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CHAPTER 10 DYNAMIC USER INTERFACES
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The second window shown when you launch Glade 3 is the widget palette, which lists all of the widgets available to you for designing your applications. A screenshot of the widget palette can be viewed in Figure 10-2.
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Figure 10-2. The Glade widget palette By default, there are four categories of widgets displayed: top-level widgets, containers, widgets used for control and display, and depreciated widgets. You should not use any widgets in the GTK+ Obsolete list in new applications, because they are depreciated and may be removed in future releases. In addition to the default categories of widgets, you may find other categories that include additional widget libraries. These can be widgets added for the GNOME libraries or other custom widget libraries. Through the View menu, you can change the layout of the widget palette. Figure 10-2 shows a widget palette that is set to show both icons and text. However, you can show only text or only icons depending on what style you are most comfortable with. To create a new top-level widget, all you need to do is click the icon of the desired widget in the Toplevels section. A new top-level widget will then be displayed and added to the widget tree in the main window. To add non-top-level widgets, you need to first click the icon of the desired widget and then click your mouse where the widget should be placed. You must click an empty cell in a container widget for the non-top-level widget to be inserted into the user interface.
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CHAPTER 10 DYNAMIC USER INTERFACES
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Creating the Window
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In this chapter, you are going to be creating a simple file browser application with Glade and Libglade. You begin by creating a new project with File New or by using the blank project created for you when the application loads. You can open an existing project with File Open if you return to this tutorial at a later time. After you have a blank project, you can begin by creating a new top-level GtkWindow by clicking the Window icon in the widget palette. In the new window, you will see a mesh pattern in the interior of the widget, as displayed in Figure 10-3. This pattern designates a region where a child widget can be added to a container. After selecting a non-top-level widget from the widget palette, you must click this region to add the widget to the container. Follow this method for adding all non-top-level widgets.
Figure 10-3. The default GtkWindow widget After you create the top-level window, you will notice changes in the content of the widget Properties window, shown in Figure 10-4. In this window, you can customize all of the properties of each widget that is supported in Glade.
Note While Glade allows you to edit many widget properties, some actions simply have to be performed in the code. Therefore, you should not view Glade as a replacement for everything that you have learned thus far in the book. You will still be doing a lot of GTK+ development in most applications.
The widget Properties window displayed in Figure 10-4 has five tabs filled with various options. The General tab provides basic options that are specific to the widget type that is currently selected. For example, the GtkWindow widget allows you to specify the window s type, title, ability to be resized, default size, and so on.
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