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Figure 3-8. A handle box attached and then detached In Listing 3-7, we create a GtkHandleBox widget that contains a GtkLabel child. The example shows all of the properties available to you through the GtkHandleBox class. Listing 3-7. Detachable Widgets (handleboxes.c) #include <gtk/gtk.h> int main (int argc, char *argv[]) { GtkWidget *window, *handle, *label; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Handle Box"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 200, 100);

13. Now change the top Ellipse to a solid color fill of black (it should turn black by default when

The dc utility is another arbitrary-precision calculator, and it works much like bc. Its main distinction lies in its use of reverse Polish notation.2 dc uses a stack to store numbers; evaluating a number pushes it onto the stack, and the operations pop their arguments off the stack and push the result back onto the stack. For shell scripting purposes, I have not used

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Returning to Linux, X11 manages windows in their most basic and abstract form. It draws windows on the screen and handles their movements. X11 also controls input devices, such as mice and keyboards, in graphical environments. X11 s basic programming interface, Xlib, provides the tools necessary to create graphical user interfaces. Although developing with Xlib is possible, most programmers prefer to use a graphical toolkit such as GTK+, since all of the low-level calls are hidden and managed by the library s methods. One of the major features that makes X11 unique among display managers is that it assumes the client and server are treated independently of each other. This allows the client to exist at a remote location independent of the server.

you select Solid Color). See Figure 6-25.

Note The definitions of client and server in the X Window System differ from their traditional ones. The client is the machine where the application is run. The server refers to the user s local display, rather than the remote machine.

2. More information on reverse Polish notation (RPN) can be found at http://en.wikipedia.org/wiki/ Reverse_polish_notation.

14. Copy the topmost Ellipse and press Control+C to copy. 15. Press Control+V to paste in another Ellipse. 16. Set the new top Ellipse to have a linear Gradient and no Stroke so that you have what I

Another advantage of the X Window System is that it does not strictly mandate user interfaces. This allows the graphical user interfaces (GUI) of window managers to be highly customizable. It is also why window managers can provide such differing interfaces and themes. This enables the freedom of choice Linux users enjoy today. Ironically, this freedom is also one of the biggest criticisms of X11. Many people fear that it will encourage fragmentation within the community of Linux developers. But for now, we can continue to enjoy the ability to choose the window manager that best suits our own needs. The GTK+ libraries were created so that you, as the programmer, do not need to interface with the X Window System directly. You can create windows and widgets, and you can handle interactions between those widgets and the user, but all direct rendering to the screen and Xlib function calls are handled automatically. Therefore, this book will not cover the X Window System any further and will focus on the GTK+ libraries instead. You are welcome to find more information about X11 and the X.Org Foundation at www.x.org.

have in Figure 6-26.

the dc calculator. It is a valuable program, but the majority of the calculations I ve needed are fairly simple and don t require the advantages it provides. I mention it only for the sake of completeness.

GTK+ relies on multiple libraries, each providing the graphical application developer a specific class of functionality. GTK+ is an object-oriented application programming interface (API) written in the C programming language. It is implemented with the concept of classes in mind to create an extensible system that builds upon itself. The object-oriented framework used was originally developed as a part of the GTK+ library itself, but has since been split from GTK+ and added to GLib as a separate supporting library called GObject. GObject enables full object-orientated development in C, including object inheritance, polymorphism, and, to the extent permissible in C, data hiding. While making a great deal of functionality from the other libraries transparently available through its own API, the GTK+ library focuses only on providing the necessities of building

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