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gtk_window_set_title(GtkWindow *window, const char *title) sets the window title. By default, GTK+ uses the command name of your program (such as gaim.exe), but the HIG recommends useful, relevant titles. gtk_window_set_default_size(GtkWindow *window, gint width, gint height) sets the initial size of the window. gtk_window_set_icon(GtkWindow *window, GdkPixbuf *pixbuf) sets the icon for this window. GdkPixbuf is an object representing an image, which I ll discuss next chapter. By setting some attributes and calling gtk_widget_show_all() on the window, you have a simple program that creates an empty, but titled, window: #include <gtk/gtk.h> int main(int argc, char *argv[]) { GtkWidget *window; gtk_init(&argc, &argv); window = gtk_window_new(GTK_WINDOW_TOPLEVEL); gtk_window_set_title(GTK_WINDOW(window), "Window"); gtk_window_set_default_size(GTK_WINDOW(window), 100, 100); gtk_widget_show_all(window); gtk_main(); return 0; } This code creates, names, and shows an empty window, shown in Figure 5-7. This application won t do anything useful; it won t even terminate when the window is closed. In order to have the application terminate, you will need to request notification when the window is closed. Upon receiving the notification, you can call gtk_main_quit(). I will return to this in the Event Listeners section of this chapter.

Figure 4-1. Sample Statspack report The top wait or timed events listed in the report identify the events that might require tuning. The SQL Ordered By sections of the report can help identify SQL statements that require tuning or that are CPU intensive. This data is necessary for finding the root cause of performance issues. The key to improving performance is to spend time tuning items that will result in the biggest improvement. Little will be gained by spending an inordinate amount of time tuning an event that is a minor consumer of system resources. Spend time focusing on the largest resource consumers. For example, if the performance data indicates that db file scattered read is by far the biggest wait event, the Applications DBA needs to look for the cause of this problem. This wait event can be caused by an excessive number of full table scan queries. The full table scans could be the result of bad database statistics causing the optimizer to build inefficient execution plans, or poorly written queries that are not taking advantage of existing

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Figure 5-7. An empty GtkWindow GtkWindow is an inherited subclass of GtkContainer. Thus, to add widgets to a GtkWindow, use gtk_container_add(). Because GtkWindow is a decoration and function container, it has only one child. Therefore, any window that requires more than one widget packed inside it will need to pack some layout container within it, most often a GtkVBox, which we ll look at in the next section. To close a window, call gtk_widget_destroy(window);

Developing a single application that provides all the features of your web site can be an extremely useful way to work for certain cases for example, when a particular application is geared toward nontechnical or only moderately technical users who simply want to download and install a single package and have their site running immediately However, when you re writing applications that are meant to be used and reused by other developers, or just by you as you work on different projects, this can be a disastrous method of developing an application You d quickly lose the ability to mix and match specific features as you build new sites, and you d typically have to compensate by adding systems that let you develop plug-ins or other additions to a single large application.

As the namespace suggests, this function will work on any GtkWidget, but because changing your UI while a window is visible is usually a bad idea, it is almost always called on a GtkWindow. The function will recursively destroy any widget within a container, so destroying a GtkWindow will destroy all its contents, as well. GtkBox GtkBox is the most commonly used layout widget in GTK+ applications. It comes in two varieties, seen in Figure 5-8: GtkHBox lays out its children horizontally. GtkVBox lays out its children vertically.

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