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Applications must maintain consistency throughout in order to give users a predictable experience, including using the same colors, fonts and font sizes, styles, and templates (used to control how items in controls are rendered or to change the appearance of the default controls). The customization used to create this application consistency needs to reside in a place where

package com.apress.bgg; public class Todo { String name String note } def todos = [ new Todo(name:"1", note:"one"), new Todo(name:"2", note:"two"), new Todo(name:"3", note:"three") ] todos.each { println "${it.name} ${it.note}" }

The arguments to the script are passed using "$@" to arg; if there is an argument, it is stored in $_arg; if not, the user is prompted (with the value of $prompt) to enter an appropriate value. Usage arg "$@"

Finally, we have elegant, easy-to-read code at a fraction of what we started with in Java. It should be obvious that if we had started with the Groovy idioms to begin with, the Groovy approach would have been much more productive.

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multiple controls, and even multiple XAML pages, will have easy access to it. That way, when you need to change any details, such as colors, you need to go to only a single place. The place where you can store these customizations is called a resource dictionary. Resource dictionaries associate a value with a key, much like you d do in a Dictionary<string,object> instance. In XAML, the key is set via the x:Key property. Any object that contains a Resources member can contain resources. This includes the layout containers (that you will encounter in the next chapter), and the App.xaml file provides resources for the entire application. Let s revise the login screen to use a resource dictionary to specify font style information. This screen will look slightly different from the earlier example since the fonts are configured with different values. You can see the result in Figure 2-5. The resource dictionary makes it easy to change the appearance of the header and labels.

The best illustration of this function comes from 5, where the conversion functions all use it. Here, for example, is the script to convert from ounces to grams (the actual calculation is done by _oz2g): oz2g() { units=grams prompt=Ounces arg "$@" _oz2g $arg printf "%s%s\n" "$_OZ2G" "${units:+ $units}" } When run without an argument, arg prompts for input. If the $units variable has been set by the calling script, it is printed: $ oz2g Ounces 23 652.05 grams And with one, there is no prompt, and no units are printed because arg empties $units when there is an argument: $ oz2g 2 56.7 The Script arg() { case $1 in "") printf "%s " "$prompt" >&2 ## Prompt for input stty echo ## Display characters entered read arg < /dev/tty ## Get user's input ;; *) arg="$*" ## Use existing arguments units= ## For use with the conversion script, 5 ;; esac }

Summary

Figure 2-5. The login screen with font properties specified by a style resource The revised XAML code for the login screen is shown here with the new additions in bold: <Canvas Width="300" Height="Auto" x:Name="canvasTag"> <Canvas.Resources> <Style x:Key="LoginHeaderFontStyle" TargetType="TextBlock"> <Setter Property="FontFamily" Value="Times New Roman"/> <Setter Property="FontSize" Value="20"/> </Style> <Style x:Key="LoginLabelFontStyle" TargetType="TextBlock"> <Setter Property="FontFamily" Value="Arial"/> <Setter Property="FontSize" Value="14"/> </Style> </Canvas.Resources> <Grid Height="140" Width="250" Canvas.Left="25" Canvas.Top="15"> <Grid.RowDefinitions> <RowDefinition/> <RowDefinition/> <RowDefinition/> <RowDefinition/> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"/> <ColumnDefinition/>

This chapter provided a brief introduction to Groovy. After describing how to install it, we demonstrated how you can dramatically reduce the code it takes to write the equivalent Java class in Groovy, while increasing the readability and expressiveness. In the next chapter, we will continue exploring Groovy by looking at its basic language features.

When a fatal error occurs, the usual action is to print a message and exit with an error status. I would like to make this exit routine uniform across all my scripts.

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