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Figure 3-2. A vertical box packed from the end position If you do not want to use the default values for expanding, filling, and spacing, you can use gtk_box_pack_end() or gtk_box_pack_start() to specify different values for each packing property. By setting the expand property to TRUE, the cell will expand so that it takes up additional space allocated to the box that is not needed by the widgets. By setting the fill property to TRUE, the widget itself will expand to fill extra space available to the cell. Table 3-1 offers a brief description of all possible combinations of the expand and fill properties. Table 3-1. expand and fill Properties

Mandatory Access Control (MAC)

public class CompanyInput { [Required] public string CompanyName { get; set; } [DataType(DataType.EmailAddress)] public string EmailAddress { get; set; } }

The cell will expand so that it takes up additional space allocated to the box, and the child widget will expand to fill that space. The cell will expand so that it takes up additional space, but the widget will not expand. Instead, the extra space will be empty. Neither the cell nor the widget will expand to fill extra space. This is the same thing as setting both properties to FALSE. Neither the cell nor the widget will expand to fill extra space. If you resize the window, the cell will not resize itself.

We ve decorated the CompanyName property with the RequiredAttribute. We ve also decorated the EmailAddress attribute with the DataTypeAttribute to take advantage of custom email address templates. In our view, we need to display potential validation error messages, and we can accomplish this in several ways. If we re using the model templates, validation messages are already included in the template, as shown in listing 15.2.

In the previous gtk_box_pack_end() call, each cell is told to place five pixels of spacing between itself and any neighbor cells. Also, according to Table 3-1, neither the cell nor its child widget will expand to take up additional space provided to the box.

In the MAC model, the computer system decides exactly who has access to which resources in the system. In the MAC model, if Alice creates a new document, the system can decide that no one but Alice is allowed to access that document. Alice herself does not have the right to decide who else is allowed to access the file that she authored. Even if she wants to share the document she authored with her friend Bob, she is not authorized to make that decision. For instance, if Alice creates a file /home/Alice/product_specs.txt in a system with a MAC model, there would be no way for Alice to decide on her own to allow Bob to see that file. In a MAC model, only the computer system determines who is authorized to access documents that Alice creates.

<h2>Edit</h2> <% using (Html.BeginForm()) { %> <%= Html.EditorForModel() %> <button type="submit">Submit</button> <% } %>

void gtk_box_pack_end (GtkBox *box, GtkWidget *child, gboolean expand, gboolean fill, guint padding);

The default editor model templates B generate a user interface that includes side-byside input elements and validation messages. For finer-grained control of the output, we can use the HtmlHelper extension methods for validation. The ValidationSummary extension provides a summary list of validation errors, usually displayed at the top of the form. For validation errors for specific model properties, we can use the ValidationMessage and expression-based ValidationMessageFor methods. With our validation messages in place, we need to check that our model is valid in the resultant POST action in our controller. We can decorate our model with validation attributes all we like, but it s still up to us to handle validation errors in our controller action, as shown in listing 15.3.

Note If you have experience programming with other graphical toolkits, the size negotiation system provided by GTK+ may seem odd. However, you will quickly learn its benefits. GTK+ automatically takes care of resizing everything if you change a user interface, instead of requiring you to reposition everything programmatically. You will come to view this as a great benefit as you continue learning GTK+.

Discretionary Access Control (DAC)

[HttpPost] public ActionResult Edit(CompanyInput input) { if (ModelState.IsValid) { return View("Success"); } return View(new CompanyInput()); }