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User controls can contain any other controls and elements, so you can use elements built into Silverlight as well as any control libraries you may have acquired. So user controls have a lot of flexibility. However, you don t necessarily have to build a user control anytime you want some custom UI the scope for customization of built-in controls is greater than you might think, thanks to control templates.

If our application uses cookie-based authentication, and the user is authenticated at the time the page containing the action token is generated, we can use the application s session authentication cookie as the cookie C (to be suitable for session authentication, session cookies must also satisfy the aforementioned properties) If no suitable cookie is already available, we can have our application set a cookie specifically for this purpose To satisfy the preceding requirements, we can generate the cookie s value as 128 random bits of output of a cryptographically strong random number generator (see 14)..

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As you already saw, controls are elements that have interactive behavior of some kind buttons are clickable; you can type into text boxes; you can scroll through the items in a listbox and select them. What may not be obvious is that most controls only provide behavior. Controls do not define their own appearance. This may appear to be a ludicrous claim. After all, if you add a Button to your user interface, you can see it. In fact, the appearance comes from a separate entity called a template. Controls have a default template, which is why something appears when you create a control, but this separation of appearance from behavior is important because you are free to replace the default template with your own. This lets you change the appearance of a control completely, without losing any of the behavior. The behavior of controls is often surprisingly subtle and complex. You might think that a button is a pretty simple sort of thing, and that you could create your own equivalent by handling the MouseLeftButtonDown event on a shape. And while that would give you a clickable element, there s a lot missing. For example, there s the way buttons push down and pop back up. They should respond to keyboard input as well as mouse input.

They should be visible to accessibility tools so that users with visual or coordination issues can use your application. And a button is about as simple as it gets. If you ve ever used a Flash application with, say, a scroll bar that just didn t feel like it was working properly you re already familiar with the hazards of trying to recreate basic controls from scratch. Fortunately, control templates mean you don t have to.

Only controls have templates. So while types such as Button and TextBox have them, more primitive types such as shapes and TextBlock UI elements that don t have any intrinsic behavior don t. This shouldn t be too surprising; an Ellipse element s only job is to look like an Ellipse, so what would it mean for it to have a template (And what element would you use inside the template to define the appearance Another Ellipse Where would it get its appearance from )

The Control base class defines a Template property. To customize the appearance of a control, you simply set this property. As Example 20-20 shows, the property expects a ControlTemplate object, and then inside this, you can put any element you like to define the appearance. (You could, of course, use a panel if you wanted to build up a complex appearance with multiple elements.)

<Button Content="OK" FontSize="20"> <Button.Template> <ControlTemplate TargetType="Button"> <Border Background="LightBlue" BorderThickness="3" BorderBrush="Black" CornerRadius="10"> <ContentPresenter Margin="20" Content="{TemplateBinding Content}" HorizontalAlignment="Center" VerticalAlignment="Center" /> </Border> </ControlTemplate> </Button.Template> </Button>

10. It is sufficient for cookies to be probabilistically unique (i.e., there is only a negligibly small probability that our application will issue the same cookie value twice to two different browser instances).

Figure 20-14 shows the results. It s rather static it doesn t offer a visual response to mouse activity yet, but we ll fix that later. But it will still raise the Click event when clicked, so it s functional, if rather dull. Notice that we ve set the Content property of the button, and this content the text OK has appeared as you d hope. That doesn t happen automatically; our template needs to say where the content should appear, and that s the purpose of the ContentPresenter in Example 20-20. Templates

for content controls need one of these placeholders for the Content property to do anything. And if you re defining a template for a control that can hold multiple pieces of content the Content and Header of a TabItem, for example you need to provide a ContentPresenter for each.

To get a better understanding of the RSSClass, we have to examine the entire code of the RSS block. Listing 7-7 has the JavaScript code of the RSS block.

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