asp.net gs1 128 Exercise 9-2. Menu Bars in Font

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Exercise 9-2. Menu Bars
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In this exercise, implement the same application as in Exercise 9-1, except use a menu bar this time. You should continue to use GtkUIManager, but the menu does not need to be contained by a GtkHandleBox. Since tooltips are not shown for menu items automatically, use a status bar to provide more information about each item. The menu bar should contain two menus: File and Edit. You should also provide a Quit menu item in the File menu.
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In this chapter, you learned two methods for creating menus, toolbars, and menu bars. The first method was the manual method, which was more difficult but introduced you to all of the necessary widgets. The first example showed you how to use basic menu items to implement a pop-up menu for a progress bar. This example was expanded on in order to provide keyboard accelerators and more information to the user with the GtkStatusbar widget. You also learned about submenus as well as image, toggle, and radio menu items.
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CHAPTER 9 MENUS AND TOOLBARS
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The next section showed you how to use menu items with submenus to implement a menu bar with a GtkMenuShell. This menu bar could be displayed horizontally or vertically and forward or backward. Toolbars are simply a horizontal or vertical list of buttons. Each button contains an icon and label text. You learned about three additional types of toolbar buttons: toggles, radio buttons, and tool buttons with a supplemental menu. Then, after much hard work, you were taught how to create dynamically loadable menus. Each menu or toolbar is held in a UI definition file, which is loaded by the GtkUIManager class. The UI manager associates each object with the appropriate action and creates the widgets according to the UI definition. Last, you learned how to create your own custom stock icons. It is necessary to create your own icons, because arrays of actions require a stock identifier to add an icon to an action. In the next chapter, we are going to take a short break from coding and cover the design of graphical user interfaces with the Glade User Interface Builder. This application creates user interface XML files, which can be dynamically loaded when your application starts. You will then learn how to handle these files programmatically with Libglade.
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Dynamic User Interfaces
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y now, you have learned a great deal about GTK+ and its supporting libraries and are able to create fairly complex applications. However, manually writing all of the code to create and configure the widgets and behavior for these applications can quickly become tedious. The Glade User Interface Builder removes the need for you to write all of that code by allowing you to design your UI graphically. It supports the GTK+ library of widgets as well as various widgets from the GNOME libraries. User interfaces are saved as XML files, which can be used to dynamically build your application s user interface. The last part of this chapter covers Libglade, a library that can be used to dynamically load the XML files. Libglade will create all of the necessary widgets and allow you to connect any signals defined in Glade.
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Note This chapter covers the user interface of Glade that is current at the time of this writing. It is possible that this may change in the future, but any changes should be an easy transition from the instructions provided in this chapter. Also, in a future version of GTK+, Libglade is going to be moved into GTK+ as the GtkBuilder object. When this happens, a tutorial will be posted on this book s web site with more information on making the transition.
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In this chapter, you will learn the following: Issues you should keep in mind when designing graphical user interfaces (GUIs) How to design custom graphical user interfaces with Glade How to dynamically load Glade user interfaces with Libglade
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