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Figure 9-6. A menu tool button showing recently opened files Listing 9-7 shows you how to implement a menu tool button. The actual tool button is created in a similar way as any other GtkToolButton except there is an extra step of attaching a menu to the GtkMenuToolButton widget. Listing 9-7. Using GtkMenuToolButton GtkToolItem *open; GtkWidget *recent; recent = gtk_menu_new (); /* Add a number of menu items where each corresponds to one recent file. */ open = gtk_menu_tool_button_new_from_stock (GTK_STOCK_OPEN); gtk_menu_tool_button_set_menu (GTK_MENU_TOOL_BUTTON (open), GTK_MENU (recent)); In Listing 9-7, the menu tool button was created with a default stock icon and label with gtk_menu_tool_button_new_from_stock(). This function accepts a stock identifier and will apply the appropriate label and icon. Alternatively, you can create a menu tool button with gtk_menu_tool_button_new(), which accepts an icon widget and the label text. You can set either of these parameters to NULL if you want to set them at a later time using GtkToolButton properties. GtkToolItem* gtk_menu_tool_button_new (GtkWidget *icon, const gchar *label); What makes GtkMenuToolButton unique is that an arrow to the right of the tool button provides the user with access to a menu. The tool button s menu is set with gtk_menu_tool_ button_set_menu() or by setting the menu property to a GtkMenu widget. This menu is displayed to the user when the arrow is clicked.

At its most basic level, a controller is simply a class that implements the IController interface. But most of the time your controllers will inherit from the System.Web. Mvc.Controller class rather than directly implementing IController. Controller classes contain one or more methods that act as actions. An action method is used to serve a single HTTP request; each action can take zero or many parameters and usually returns an ActionResult. Parameters are passed to the action method using the model binding infrastructure. By making use of these binders to do the heavy lifting, the controller action is free to focus on controlling application logic rather than translating user input to concrete classes. A well-written action should have a clear purpose and a single responsibility. That responsibility is to accept input from the browser and coordinate the flow of the application. Along the way, the action should rely on application services to perform tasks such as executing business logic, performing data access, or file I/O. Listing 4.1 shows a simple controller with a single action. This is a trivial example we ll tackle more complex scenarios later.

While it is possible to manually create every menu and toolbar item, doing so can take up a large amount of space and cause you to have to code monotonously for longer than necessary. In order to automate menu and toolbar creation, GTK+ allows you to dynamically create menus from XML files.

using System.Web.Mvc; namespace MvcInAction.Controllers { public class SimpleController : Controller { public ActionResult Hello() { ViewData.Add("greeting", "Hello Readers!"); return View(); } } }

A typical HTTP request that a browser will make to a web server for the server s home page is the following: GET / HTTP/1.0 When the web server receives this request for the filename /, the root document on the web server, it attempts to load a file usually called index.html. If the server can locate the file requested, it sends back the following HTTP response, followed by the contents of the document: HTTP/1.0 200 OK <document content> Once the browser receives the document contents, very often in HTML, it will render that document on the user s screen.

User interface files are constructed in XML format. All of the content has to be contained between <ui> and </ui> tags. One type of dynamic UI that you can create is a GtkMenuBar with the <menubar> tag shown in Listing 9-8. Listing 9-8. Menu UI File (menu.ui) <ui> <menubar name="MenuBar"> <menu name="FileMenu" action="File"> <menuitem name="FileOpen" action="Open"/> <menuitem name="FileSave" action="Save"/> <separator/> <menuitem name="FileQuit" action="Quit"/> </menu> <menu name="EditMenu" action="Edit"> <menuitem name="EditCut" action="Cut"/> <menuitem name="EditCopy" action="Copy"/> <menuitem name="EditPaste" action="Paste"/> <separator/> <menuitem name="EditSelectAll" action="SelectAll"/> <menuitem name="EditDeselect" action="Deselect"/> </menu> <menu name="HelpMenu" action="Help"> <menuitem name="HelpContents" action="Contents"/> <menuitem name="HelpAbout" action="About"/> </menu> </menubar> </ui> While not necessary, you should add the name attribute to every menubar, menu, and menuitem. The name attribute can be used to access the actual widget. If name is not specified, using the "action" field can access the widget.