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Figure 3-6. Problems caused by different font sizes in a GtkFixed container You can explicitly set the size and font of text to avoid overlap, but this is not advised in most cases. Accessibility options are provided for users with low vision. If you change their fonts, some users may not be able to read the text on the screen. Another problem with using GtkFixed arises when your application is translated into other languages. A user interface may look great in English, but the displayed strings in other languages may cause display problems, because the width will not be constant. Furthermore, languages that are read right to left, such as Hebrew and Arabic, cannot be properly mirrored with the GtkFixed widget. It is best to use a variable-sized container such as GtkBox or GtkTable in this case. Finally, it can be quite a pain adding and removing widgets from your graphical interface when using a GtkFixed container. Changing the user interface will require you to reposition all of your widgets. If you have an application with a lot of widgets, this presents a long-term maintenance problem. On the other hand, you have tables, boxes, and various other automatically formatting containers. If you need to add or remove a widget from the user interface, it is as easy as adding or removing a cell. This makes maintenance much more efficient, which is something you should consider in large applications.

2. Draw an Ellipse on the workspace, as in Figure 6-20.

Therefore, unless you know that none of the presented problems will plague your application, you should use variable-sized containers instead of GtkFixed. This container was presented only so you know it is available if a suitable situation arises. Even in suitable situations, flexible containers are almost always a better solution and are the proper way of doing things.

1. Globbing is the term used for the shell s completion of paths and filenames that contain metacharacters.

in Figure 6-21.

The GtkExpander container can handle only one child. The child can be shown or hidden by clicking the triangle to the left of the expander s label. A before-and-after screenshot of this action can be viewed in Figure 3-7.

Figure 6-22.

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3. Working from left to right, perform any multiplication or division. 4. Working from left to right, perform any addition or subtraction.

Figure 3-7. A GtkExpander container Listing 3-6 was used to create Figure 3-7. The example introduces you to the most important GtkExpander methods. Listing 3-6. Showing and Hiding Widgets (expanders.c) #include <gtk/gtk.h> int main (int argc, char *argv[]) { GtkWidget *window, *expander, *label; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Expander"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 200, 100); expander = gtk_expander_new_with_mnemonic ("Click _Me For More!"); label = gtk_label_new ("Hide me or show me,\nthat is your choice.");

5. Now select the Stroke property and click No brush, as in Figure 6-23.

gtk_container_add (GTK_CONTAINER (expander), label); gtk_expander_set_expanded (GTK_EXPANDER (expander), TRUE); gtk_container_add (GTK_CONTAINER (window), expander); gtk_widget_show_all (window); gtk_main (); return 0; } Listing 3-6 uses gtk_expander_new_with_mnemonic() to initialize the GtkExpander. If you place an underscore in the initialization string of this function, a keyboard accelerator will be created. For example, whenever the user presses Alt+M on the keyboard in Listing 3-6, the widget will be activated. Activating a GtkExpander widget will cause it to be expanded or retracted depending on its current state.

A math library available in ksh lets us perform more-sophisticated mathematical calculations. These are the functions it provides: abs(), acos(), asin(), atan(), atan2(), cos(), cosh(), exp(), floor(), fmod(), hypot(), int(), log(), pow(), sin(), sinh(), sqrt(), tan(), and tanh(). Table 11-1 gives a basic description of these functions, but their use is beyond the scope of this book. The following variable assignment demonstrates the use of one of these higher level mathematical functions:

6. In the Objects and Timeline panel, select the Grid named LayoutRoot. 7. In the Properties panel change the background color from white to black. 8. Now select the Ellipse again and press Control+C to copy it. 9. Press Control+V to paste another Ellipse on top of it.

Tip Mnemonics are available in almost every widget that displays a label. Where available, you should

abs() acos() asin() atan() atan2() cos() cosh() exp() floor() fmod() hypot() int() log() pow() sin() sinh() sqrt() tan() tanh()

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