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Let s expand the routes and allow events to be listed by category. The most usable URL from the user s point of view would probably be something like this:

o far, you have not learned about any widgets that are designed to facilitate user interaction except GtkButton. That changes in this chapter, as we will cover many types of widgets that allow the user to make choices, change settings, or input information. These widgets include stock buttons, toggle buttons, check buttons, radio buttons, color selection buttons, file chooser buttons, font selection buttons, text entries, and number selection buttons. The exercise at the end of the chapter will give you the opportunity to combine many of these widgets into larger applications. In this chapter, you will learn the following: How to use clickable buttons with stock items How to use types of toggle buttons, including check buttons and radio buttons How to use the entry widget for one-line, free-form text input How to use the spin button widget for integer or floating-point number selection What sort of specialized buttons are available

For example, it is not sufficient to use Referer headers to check that a user came to a given page on our web site via a specific other page (such as a terms-and-conditions display); a malicious user could go directly to the page in question, forging the Referer header in the request8 However, in the XSRF scenario, we are dealing with a malicious third-party site that interacts with a well-behaved browser operated by our victim user; as such it is reasonable to assume that the Referer headers are accurate, if they are present Unfortunately, relying on Referer headers is not feasible in practice: they can be empty or absent for various reasons, and there is no valid strategy for dealing with empty Referer headers.

But now we have a problem! We already have a route that matches /events/<something> used to list the events on a particular year, month, or day, so how are we now going to try to use /events/<something> to match a category as well Our second route segment can now mean something entirely different; it clashes with the existing route. If the routing system is given this URL, should it treat that parameter as a category or a date Luckily, the routing system in ASP.NET MVC allows us to apply conditions. The syntax for this can be seen in section 16.3.3, but for now it s sufficient to say that we can use regular expressions to make sure that routes only match certain patterns for a parameter. This means that we could have a single route that allows a request like / events/2009-01-01 to be passed to an action that shows events by date, and a request like /events/asp-net-mvc-in-action to be passed to an action that shows events by category. These URLs should clash with each other, but they don t because we ve made them distinct based on what characters will be contained in the URL. This starts to restrict our model design. It will now be necessary to constrain event categories so that category names made entirely of numbers aren t allowed. You ll have to decide if this is a reasonable concession to make in your application for such a clean URL schema. The next principle we ll learn about is URL size. For URLs, size matters, and smaller is better.

When you create applications in GTK+, you will begin to notice that you are using the same buttons and menu items across many applications. Because of this, GTK+ includes stock items, which are pairs of images and strings that accommodate often-used menu items and buttons. GTK+ provides gtk_button_new_from_stock(), which will create a new button using a predefined stock item. Each stock item contains an image and a mnemonic label that are applied to the button. A full list of stock items can be found in Appendix D. Each item is included in GTK+, because each is used by a wide number of applications. While Appendix D includes all of the stock icons available in GTK+ 2.10, you may notice when running applications that the icons are not the same on your system. This is because, while you will always have these stock items available, the default image may be replaced by the user s theme of choice or by the developer.