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The third parameter of this function is an integer that states the position of the action group within the UI manager. Actions with the same name in groups with a lower position will take preference over those with higher positions. Next, you will want to use gtk_ui_manager_add_ui_from_file() to load any number of UI files. In Listing 9-11, the menu.ui and toolbar.ui files were loaded with respect to the executable. The third parameter of this function is an optional GError object. guint gtk_ui_manager_add_ui_from_file (GtkUIManager *uimanager, const gchar *filename, GError **error); This function will load the content of each file. Each element is then matched up with objects added from an action group. The UI manager will then create all of the appropriate widgets according to the UI definition. An error will be output to the terminal if an action does not exist. After the UI manager creates the widgets, you can load them based on name paths or the action if the name parameter does not exist, as shown in the following code. The two top-level widgets were the menu bar and toolbar found at "/MenuBar" and "/Toolbar". They are loaded with gtk_ui_manager_get_widget(). GtkWidget* gtk_ui_manager_get_widget (GtkUIManager *self, const gchar *path); You have to give the absolute path to any widget when a path is required. In the absolute path, the <ui> element is omitted. The path is then built with the name attribute of each item. For example, if you wanted to access the GTK_STOCK_OPEN element in the menu bar, you call gtk_ui_manager_get_widget(), which would return the "/MenuBar/FileMenu/FileOpen" menu item.

Because SubtitleDataAttribute is responsible for instantiating its helpers in listing 19.4, it has a compile-time coupling to SubtitleBuilder (evidenced by the new keyword). Another drawback to action filter attributes is the work involved in applying them you must remember to apply them to each action on which they re needed. One solution to this could be to create a layer supertype controller (a base controller) and apply the filter attribute to that. Then all controllers that wanted the action filter s behavior could simply derive from that layer supertype. The problem with relying on inheritance to solve this problem is that it couples our controller to the base type. Inheritance is a compiled condition, which makes

Menu and toolbar items with stock images and keyboard accelerators are great, but what about using toggle buttons and radio buttons with GtkUIManager For this, GTK+ provides GtkToggleActionEntry and GtkRadioActionEntry. The content of GtkToggleActionEntry follows: typedef struct { const gchar *name; const gchar *stock_id; const gchar *label; const gchar *accelerator; const gchar *tooltip; GCallback callback; gboolean is_active; } GtkToggleActionEntry;

4. If you are not so familiar with object-oriented programming, the term method used in the following discussion is almost equivalent to function.

runtime changes difficult. And even compile-time changes are hard: if the layer supertype changes, all derivations must change. In cases like these, we favor composition over inheritance. By extending the default ControllerActionInvoker (mentioned briefly in chapter 9) we can compose action filters at runtime without using attributes on actions, controllers, or a layer supertype controller. In listing 19.5 we extend ControllerActionInvoker to allow us to apply action filters without attributes.

Note One advantage of using UI definitions is that the actual definition does not know anything about how

public class AutoActionInvoker : ControllerActionInvoker { private readonly IAutoActionFilter[] _filters; public AutoActionInvoker( IAutoActionFilter[] filters) { _filters = filters; } protected override FilterInfo GetFilters (ControllerContext controllerContext, ActionDescriptor actionDescriptor) { FilterInfo filters = base.GetFilters(controllerContext, actionDescriptor); foreach (IActionFilter filter in _filters) { filters.ActionFilters.Add(filter); } return filters; } }

the action is going to be implemented in your application. Because of this, the user can redesign a menu structure without needing to know how each action will be implemented.

When a Java program starts running, the code in its main() method is executed first. The main() method in the program creates a new SimpleWebServer object and calls its run() method. The SimpleWebServer object is a data structure that contains both the code and data that make up the web server. When the line containing new SimpleWebServer() executes, it invokes the constructor method. The constructor is simply a method that creates the SimpleWebServer object it allocates memory for it and initializes the data used by the object. Once the SimpleWebServer object is constructed and initialized, the main() method calls the run() method, which handles all the real work done by the server. The run() method consists of an infinite loop while (true) that waits for a connection from a client, and then attempts to process the client s request. The call to the ServerSocket accept() method returns a socket object that corresponds to a unique socket on the server and allows the server to communicate with the client.

The controller action invoker will take an array of custom action filters as a constructor parameter B and apply each of them to the action when it s invoked C.