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The most commonly used GtkContainer subclasses used for layout are GtkBox and GtkTable. The former is further subclassed into GtkHBox and GtkVBox. The purpose of these container widgets is to determine the size and location of widgets packed into it. If you pack two button widgets into a GtkHBox, the GtkHBox will do all the work in determining how big each button should be and where on-screen it should be drawn. The programmer doesn t concern himself with these details when multiple widgets are competing for the same space. However, the programmer certainly is concerned about the general appearance of the UI. Having a check box take up 95% of the area of a window and forcing the rest of the contents into the remaining 5% certainly wouldn t be appropriate. Because of this, each layout container provides its own functions to use when adding widgets to it, each providing a set of tunable parameters that specify generally where to place each widget and how large it should be. I will discuss these parameters in the section for each specific widget. Layout containers are very important because they create the entire structure of your GUI. Each window in GTK+ is composed of various layout containers packed inside one another. I will return to this notion when discussing GtkBox, the most often-used layout container.

GtkContainer objects are also used for decoration and function These are typically derived from the GtkBin subclass of GtkContainer These containers are less concerned with size and location; in fact they hold only one child and allow it all the space it needs Containers in this category change the way their children appear and behave This allows GTK+ to include only a small number of basic widgets for displaying text and images, and then pack them inside other widgets to add more-complex behaviors The text label widget, GtkLabel, for example, is a very basic widget used prominently throughout GTK+ When GtkLabel is packed within a layout container, it merely displays a string of text When packed inside a GtkButton, however, a frame forms around it, giving it the appearance of a button, and it becomes clickable Complex widgets are almost always built up from smaller widgets packed together.

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Although user profiles and preference systems are important and useful features to have, they don t have a whole lot to do with the usersignup process, and just getting that process right can be complicated enough on its own On the other hand, a feature more relevant to the signup process might be an explicit activation step, in which you send the new user an e-mail instructing her to confirm the account Also, if you need to have user signups on multiple sites, you ll probably need to specify different ways to collect the initial account information For example, some sites might need new users to read and agree to terms of service or other policies, while others might have restrictions on who can sign up Finally, many sites also want some way of preventing automated signups by spambots.

It is advisable to collect snapshots during periods of normal activity in the system to provide a baseline of comparison for snapshots that are taken during periods when performance degradation is being experienced. In order to compare information, snapshots should be of the same duration and be executed during the same level and type of activity. Enterprise Manager (EM), dbms_jobs, or crontab may be used to schedule snapshots on a regular basis. The use of these methods for scheduling activities will be described in 6 of this guide. The spauto.sql script in the $ORACLE_HOME/rdbms/admin directory will schedule snapshots to execute every hour.

Because layout isn t a concern for decoration and function containers, they typically don t have special functions for packing widgets inside them Because they all derive from GtkContainer, you can use gtk_container_add(), which I ll discuss later this chapter GtkWindow GtkWindow is a container widget that represents a top-level window Every other widget in your GTK+ application will be packed inside a GtkWindow To create a window, call gtk_window_new, which takes one argument, a GtkWindowType There are only two different GtkWindowType values currently: GTK_WINDOW_TOPLEVEL and GTK_WINDOW_POPUP You will most likely use the former exclusively GTK_WINDOW_TOPLEVEL is a standard application window with a title bar GTK_WINDOW_POPUP is an unmanaged window with no title bar, and is used for things such as tooltips and menus Both types of window are shown in Figure 5-6 An empty window is the most basic UI element you can create and show in GTK+.

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