JavaFX Script Basics in Java

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2 JavaFX Script Basics
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public function average(a, b) { return (a + b) / 2; }
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// Visible outside the script
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public function run(args:String[]) { var x = 2; var y = 4; var avg = bind average(x, y); // Binds "avg" to the return value println("Average is {avg}"); y = 8; // Causes the value of "avg" to be changed println("Average is {avg}"); }
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Library code and components are typically implemented in scripts that do not have any executable code at all Scripts with no executable code do not need a run() function, although it is legal to include one if you want toA typical use for a run() function in a library script is to provide some basic tests for the features that the script exports, like this:
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public function average(a, b) { return (a + b) / 2; } // Definition of a function
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public function run(args:String[]) { var x = 2; var y = 4; var avg = bind average(x, y); // Binds "avg" to the return value if (avg != 3) { println("Test 1: ERROR: avg is {avg}, not 3"); } y = 8; // Causes the value of "avg" to be changed if (avg != 5) { println("Test 2: ERROR: avg is {avg}, not 5"); } }
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Here, the run() function contains two simple tests for the average() function, which is the useful content of this script If, as in this case, your run() function does not need access to the command line arguments or doesn t need to return anything, you can omit the corresponding parts of its declarationThe keyword public is also optional, so the simplest possible way to declare this function is as follows:
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function run() { }
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A script that does not have a run() function does not have direct access to its command-line arguments, but you can still get them by using the getArgument() function of the javafxlangFX class, which is described in 12
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Predefined Variables
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Predefined Variables
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Four variables, listed in Table 2-3, are automatically defined in every scriptAppropriate values are assigned to these variables by the JavaFX runtime when a script that references them is executed8
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Table 2-3 Name
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__FILE__ __SOURCE_FILE__ __DIR__
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Predefined Script Variables Value
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The string form of a URL that refers to the class file generated from the JavaFX script in which it appears The string form of a URL that refers to the JavaFX script source file The string form of a URL that refers to the directory that contains the class file generated from the JavaFX script in which it appears, including a trailing / A string that indicates the environment in which the JavaFX script is being executed The values that are currently defined are "desktop", "mobile", "tv", and "browser"
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__PROFILE__
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The following script prints the values of three of these variables:
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println("__FILE__ is {__FILE__}"); println("__DIR__ is {__DIR__}"); println("__PROFILE__ is {__PROFILE__}");
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Here s a typical result of running this code from the command line:
__FILE__ is file:/E:/JavaFX/EXAMPLES/classes/javafxbasics/PredefinedVariablesclass __DIR__ is file:/E:/JavaFX/EXAMPLES/classes/javafxbasics/ __PROFILE__ is desktop
In this case, the compiled classes are in a directory structure, so the __DIR__ variable points to the directory to which the class file for the script has been written, while __ FILE__ refers to the class file within that directory Note the trailing / in the value of the __DIR__ variable If this example were to be run from the NetBeans IDE, the class files would be packaged into a JAR file before execution and the output would be different:
__FILE__ is
The compiler only generates these variables and the code to initialize them for those scripts that actually reference them
2 JavaFX Script Basics
jar:file:/E:/JavaFX/EXAMPLES/NetBeans/JavaFX%20Book%20Intro/dist/ JavaFX_Book_Introjar!/javafxbasics/PredefinedVariablesclass __DIR__ is jar:file:/E:/JavaFX/EXAMPLES/NetBeans/JavaFX%20Book%20Intro/dist/ JavaFX_Book_Introjar!/javafxbasics/ __PROFILE__ is desktop
Without any modification to the script, the variables now refer to the class in the JAR file and the directory in the JAR file in which it residesAs a result of this, you can use the __FILE__ and __DIR__ variables to locate resources, such as image files or media files, that are packaged with your application in a way that is independent of where the application is installed or how it is executedYou ll see examples of this later in this book The __SOURCE_FILE__ variable refers to the location of the source file from which the class file was compiled It is a constant and therefore does not depend on the way in which the class files are packaged or executedThis variable is intended to be used when JavaFX is used in scripting mode ; that is, a source file is compiled and executed immediately via the eval() function in the javafxlangFX class or through the Scripting APIs defined in JSR-233