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GObject is the base object class of every other object in GTK+, including every GtkWidget. Now that you understand how to create a new GObject descending from GtkCellRenderer, you ll find there are few differences in creating a GObject descending from any GtkWidget. Typically, the simplest such GtkWidgets are called composite widgets.

Oracle Applications. Single-tier architectures can cause contention between application and database processing, which will result in performance degradation.

As mentioned in the previous chapter, a composite widget is merely a widget composed of other widgets amalgamated into a single entity. This kind of widget can be created entirely with ordinary GTK+ API calls, but making it a widget of its own adds a level of encapsulation, which benefits the developer. The collection of widgets becomes a single, reusable object. A composite widget is a container that comes prepacked with other widgets created and handled by the composite widget. This widget can emit signals of its own and do anything else any other GTK+ widget can do. Examples of composite widgets in GTK+ itself include GtkDialog (which descends from GtkWindow, a container widget) and GtkFileChooserWidget (which descends from GtkVBox). For the ftmakeover plug-in, I ve turned the file transfer dialog into a composite widget called GtkFileTransferDialog. To create a file transfer dialog with GtkFileTransferDialog, you can call gtk_file_transfer_dialog_new() and be returned a widget, properly packed with GtkTreeView, GtkTable, and GtkButton objects, among others. While this is possible without creating a composite widget (as evidenced by the fact that Gaim doesn t use one for the File Transfer window), creating the composite widget allows the dialog to emit its own signals and keep its own properties. Naturally, the class a new composite widget will descend from is the container class that contains the widgets. The formatting toolbar in Gaim, shown in Figure 6-4, is a composite widget. The elements within it are arranged in a GtkHBox, so the widget descends from GtkHBox. Any function that can be called on a GtkHBox can be called on the formatting toolbar; plug-ins can add their own buttons with gtk_box_pack_start().().

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Django s form-handling code, which lives in the module django.forms, provides three key components that, taken together, cover every aspect of constructing, displaying, and processing a form: A set of field classes, similar to the types of fields available for Django data models, which represent a particular type of data and know how to validate that data A set of widget classes, which know how to render various types of HTML form controls (text inputs, check boxes, and so on) and read out the corresponding data from an HTTP form submission A Form class that ties these concepts together and provides a unified interface for defining the data to be collected and high-level rules for validating it

Figure 6-4. Gaim s formatting toolbar descends from GtkHBox, and can be treated as a single entity. Similarly, because the elements of the file transfer dialog are packed into a GtkDialog, GtkFileTransferDialog descends from GtkDialog. As explained in the previous section, declaring a new class in GObject is simply a matter of declaring a pair of structs, registering a new type and providing some basic information about the class, including the parent class, the class_init function and the instance_init function. First, you must declare your two structs: one for the class and one for the instance. Again, both must inherit from the parent class, so GtkFileTransferDialog and GtkFileTransferDialogClass descend from GtkDialog and GtkDialogClass, respectively. Your class struct contains class-wide variables and function pointers for default behaviors as it did in the preceding example. GtkFileTransferDialog has just one signal, discussed in the previous section.

When more nodes of the application tier are split across multiple servers, and additional nodes are defined for the same component, we begin to enter into advanced configuration topics and design. Advanced, multi-tier configurations for Oracle Applications include combining multiple Web, Forms, Concurrent Processing, and Database Nodes. The number of nodes required is dependent upon your environmental requirements for concurrent user support and transactional processing. An advanced multi-tiered Oracle Applications environment is displayed in Figure 1-2:

To get a feel for how this works, let s take a look at a simple but common requirement: user signups.

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