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Listing 3-4 creates the GtkTable widget shown in Figure 3-4, inserting two GtkLabel widgets and a GtkEntry widget into the two-by-two area (you will learn how to use the GtkEntry widget in 4, but this gives you a taste of what is to come). Listing 3-4. GtkTable Displaying Name (tables.c) #include <gtk/gtk.h> int main (int argc, char *argv[]) { GtkWidget *window, *table, *label, *label2, *name; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Tables"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 150, 100); table = gtk_table_new (2, 2, TRUE); label = gtk_label_new ("Enter the following information ..."); label2 = gtk_label_new ("Name: "); name = gtk_entry_new (); /* Attach the two labels and entry widget to their parent container. */ gtk_table_attach (GTK_TABLE (table), label, 0, 2, 0, 1, GTK_EXPAND, GTK_SHRINK, 0, 0); gtk_table_attach (GTK_TABLE (table), label2, 0, 1, 1, 2, GTK_EXPAND, GTK_SHRINK, 0, 0); gtk_table_attach (GTK_TABLE (table), name, 1, 2, 1, 2, GTK_EXPAND, GTK_SHRINK, 0, 0); /* Add five pixels of spacing between every row and every column. */ gtk_table_set_row_spacings (GTK_TABLE (table), 5); gtk_table_set_col_spacings (GTK_TABLE (table), 5); gtk_container_add (GTK_CONTAINER (window), table); gtk_widget_show_all (window); gtk_main (); return 0; }

The HOWOLD variable is used as the maximum age, in days, for saved core files. Any files older than this will be removed. The FSLIST variable contains the list of file systems that will be checked for core files. The list will vary from system to system. You could set FSLIST dynamically by using the df command to determine the locally mounted file systems. The command might look something like this: FSLIST=`df -l | grep '^/dev' | awk '{print $6}'`, which gathers the lines starting with /dev and then prints the field containing the file-system name. The other four variables contain the name of the system that the script is running on (UNAME), the current date (DATE), the directory to which the core files will be saved (DATADIR), and the name of the log file (LOGFILE).

and Timeline panel (see Figure 6-15).

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When creating a table with gtk_table_new(), you must specify the number of columns, the number of rows, and whether table cells should be homogeneous. GtkWidget* gtk_table_new (guint rows, guint columns, gboolean homogeneous); The number of columns and rows can be changed after creating the table with gtk_table_resize(), but you should use the correct numbers initially, if possible, to avoid confusion on the part of the user. You do not want to get in the habit of liberally changing user interfaces when it is not completely necessary. void gtk_table_resize (GtkTable *table, guint rows, guint columns); The function gtk_table_set_homogeneous() can also be used to reset the homogeneous property after creation, but you should use the desired value initially here as well. The user should have control of resizing after the initial user interface is set. void gtk_table_set_homogeneous (GtkTable *table, gboolean homogeneous); Packing a new widget is performed with gtk_table_attach(). The second parameter, child, refers to the child widget that you are adding to the table. void gtk_table_attach (GtkTable *table, GtkWidget *child, guint left, guint right, guint top, guint bottom, GtkAttachOptions xoptions, GtkAttachOptions yoptions, guint xpadding, guint ypadding); The left, right, top, and bottom variables describe the location where the child widget should be placed within the table. For example, the first GtkLabel in Listing 3-4 was attached with the following command: gtk_table_attach (GTK_TABLE (table), label, 0, 2, 0, 1, GTK_EXPAND, GTK_SHRINK, 0, 0);

5. Click the dropdown labeled EventName and select MouseEnter, as I am doing in Figure 6-16.

This chapter s first math method is the use of expr. expr is a utility that evaluates various types of expressions, including ones containing string, logical, and mathematical functions. The following are examples of how to use expr to carry out mathematical operations: Addition: answer=`expr $c + $d` Subtraction: answer=`expr $c - $d` Multiplication: answer=`expr $c \* $d` Division: answer=`expr $c / $d` Remainder: answer=`expr $c % $d` There are no explicit trigonometric or exponentiation functions in expr.

The GtkLabel widget is attached directly to the first column and row of the table, because x coordinates are added, followed by y coordinates. It is then attached to the second row on the bottom and the third column on the right. The packing from the example in Listing 3-4 is shown in Figure 3-5.

MouseEnter State of the MouseEnterLeaveStateGroup, as I am doing in Figure 6-17.

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