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</Grid.ColumnDefinitions> <TextBlock HorizontalAlignment="Center" Text="Please enter your information" Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="2" Style="{StaticResource LoginHeaderFontStyle}" /> <TextBlock Text="Username:" VerticalAlignment="Top" HorizontalAlignment="Right" Grid.Column="0" Grid.Row="1" Style="{StaticResource LoginLabelFontStyle}"/> <TextBox VerticalAlignment="Top" Grid.Column="1" Grid.Row="1"/> <TextBlock HorizontalAlignment="Right" VerticalAlignment="Top" Grid.Column="0" Grid.Row="2" Text="Password:" Style="{StaticResource LoginLabelFontStyle}"> </TextBlock> <TextBox VerticalAlignment="Top" Grid.Column="1" Grid.Row="2"/> <Button Content="Login" Grid.Row="3" Width="100" Grid.Column="1" HorizontalAlignment="Left"/> </Grid> </Canvas> To reference static resources, you need a way to tell the XAML parser that you want to use a resource and which resource to use. The markup extension name for referencing a static resource is simply StaticResource, and it appears after the open curly brace. The StaticResource markup extension takes a single parameter: the name of the resource to reference. The x:Key property is used to give each style a name for referencing in the markup extension. While we will discuss styles in detail in 8, what s going on here isn t a big mystery. The TargetType property of the Style element is used to specify the object type the style is meant for, and the Setter elements are used to specify values for properties on this target type. In this case, we are defining two styles: one for the header text (the Please enter your information text) and the other for the labels next to the text input boxes. By changing the LoginLabelFontStyle, you affect both the username and the password labels at the same time. This is good it makes styling applications significantly easier both because the style information is stored in a central place and because the specific styles need only a single definition to affect potentially many elements of a user interface.

hapter 1 introduced you to Groovy, its relationship to Java, and where it differs. This chapter will delve into the Groovy language. The focus will be on language features commonly used to build Grails applications. First, you will learn about Groovy scripts, including compiling and running Groovy scripts using the command line, Groovy Shell, and Groovy Console. Then we will focus on specific aspects of the Groovy language: assertions, strings, methods, closures, collections, ranges, regular expressions, and operators.

The die function takes an error number and a message as arguments. The first argument is stored in $result, and the rest are printed to the standard error.

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You will be using the Groovy language to build: domain objects, controllers, and services. But that isn t the only way to use Groovy. In addition to building classes, you can use Groovy as a scripting language. You will see detailed examples of scripts in 12, which covers using scripts in an application context to access a web service. But here we ll start with a simple script. Listing 2-1 is an example of a very simple Groovy Hello script that takes an argument and uses it to print a message.

The DependencyObject class acts as the base object for many classes in Silverlight. One important aspect of this class, however, is its single property, Dispatcher. Objects can be modified only on the thread they are created on. Each object, therefore, has a Dispatcher property that provides two important pieces of functionality. For starters, you can test whether an object can be modified from the current thread by calling the CheckAccess method. If the current thread is the same as the one the Dispatcher belongs to, CheckAccess will return true. The other important functionality is the ability to queue some code to execute on the Dispatcher s thread. This is how you go about solving the cross-thread access problem when modifying user interface objects. The method used to execute some code on the Dispatcher s thread is called BeginInvoke. Figure 15-3 shows the relationship of two threads and the Dispatcher object.

Usage die NUM [MESSAGE ...] This function is usually used when an important command fails. For example, if a script needs certain directories, it may use checkdirs (introduced later in this chapter) and call die when one cannot be created: checkdirs "$HOME/scripts" "$HOME/bin" || die 13 "Could not create $dir" The Script die() { result=$1 shift printf "%s\n" "$*" >&2 exit $result }

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