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Web 43: Gnome and KDE Programming
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Development support for application interfaces was an integral part of both the Gnome (GNU Network Object Model Environment) and KDE (K Desktop Environment) projects from their inception. Any application can be designed easily to use either Gnome or KDE graphical components such as windows, toolbars, and buttons. Their aim is to provide not just a consistent interface, but also a flexible platform for the development of powerful applications. Both are completely free under the GNU Public License, with no restrictions. Both Gnome and KDE provide extensive development libraries that contain functions and definitions you can use in C and C++ programs to create Gnome or KDE interfaces for your applications. You can code these directly into your program source code, or use a GUI development tool like KDevelop or Glade to construct your interfaces by simply selecting and combining different components. This chapter will briefly describe essential aspects of both Gnome and KDE development. For more information and detailed documentation, check the Gnome development site at, and the KDE development site at
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Gnome provides libraries of Gnome GUI tools that developers can use to create Gnome applications, and programs can be said to be Gnome compliant if they use buttons, menus, and windows that adhere to a Gnome standard. Gnome applications make use of Gnome, GTK Toolkit, GGTK Drawing Kit, and GNU libraries. For detailed descriptions of the functions, definitions, and structures contained in these libraries, it is strongly recommended that you use the extensive documentation available on the Gnome developer's Web site at The Documentation section includes detailed tutorials, manuals, and reference works, including the complete reference for the Gnome, GTK, and GDK APIs. GTK+ is the widget set used for Gnome applications, and its look and feel was originally derived from Motif. A widget set is the set of GUI objects that are available for use in a desktop. Buttons, windows, and toolbars are all examples of widgets. The widget set is designed from the ground up for power and flexibility. For example, buttons can have labels, images, or any combination thereof. Objects can be dynamically queried and modified at run time. GTK+ also includes a theme engine that lets users change the look and feel of applications using these widgets. At the same time, the GTK+ widget set remains small and efficient. The GTK+ widget set is entirely free under the Library General Public License (LGPL). The LGPL allows developers to use the widget set with proprietary as well as free software. The widget set also features an extensive set of programming language bindings including C++, Perl, Python, Pascal, Objective-C, Guile, and Ada. Internalization is fully supported, permitting applications based on GTK+ to be used with other character sets, such as those of Asian languages. The drag-and-drop functionality supports both XDND and Motif protocols, allowing drag-and-drop operations with other widget sets that support these protocols, such as Qt and Motif.
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Programs written to work on Gnome are essentially C programs that contain Gnome and GTK+ functions. The Gnome and GTK+ functions handle the Gnome desktop operations for a program. When programming for Gnome, you will make use of a very extensive set of functions and structures contained in many libraries these functions and structures make up the different components that go into a Gnome application. This chapter can only provide a general overview of these libraries and of how you use them to create Gnome programs. Though Gnome is not as easy to use as Tk, programming in Gnome requires the use of only a few basic functions to create simple user interfaces. You can think of GTK+ functions as lower-level operations and Gnome functions as easy-to-use higher-level operations. The Gnome functions usually incorporate several GTK+ functions, making GUI tasks relatively easy to program. A Gnome program is essentially a C program with GTK+ functions as well as Gnome functions. Because several basic Gnome operations are handled by GTK+ functions, this chapter begins by discussing basic GTK+ programming, and then discusses Gnome programs. The Gnome libraries provide the highest-level functions used in Gnome applications. Below them are the GTK+ libraries. GTK+ is the toolkit developed for the GNU Image Manipulation Program (GIMP). GTK+ is made up of the GIMP Toolkit (GTK) and GIMP Drawing Kit (GDK) libraries. GTK contains the functions and structures for managing widgets and user interface tasks. These functions and structures can be accessed directly in any Gnome program. In fact, a Gnome application is a GTK program with Gnome library functions. GTK functions and structures are C++ program objects, both designed to be used in a C++ style program. GDK contains lower-level functions that are used to connect GTK to the Xlib libraries. The Xlib libraries hold functions that perform the actual X Window System operations. Both GTK and Gnome also make use of the standard C functions provided by the Glib library. Table 2 lists the different Gnome components. Table 2: Gnome: Components Description Contains high-level Gnome functions Contains widgets and GUI functions Provides a low-level wrapper for Xlib Provides X Window operations Contains the GNU C library of standard functions
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