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JavaFX: A Beginner s Guide
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little effort you have created a new node that takes and displays notes The final script for Notesfx should appear as follows:
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/* * Notesfx * * v10 - J F DiMarzio * * 6/23/2010 created * * A Custom Node that uses RoundButton * - SwingTextField, and Text * */ package comjfdimarziojavafxforbeginners; import import import import import javafxsceneCustomNode; javafxscenetextText; javafxsceneNode; javafxsceneGroup; javafxextswingSwingTextField;
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/** * @author JFDiMarzio */ public class Notes extends CustomNode{ var notetext: String; var newNote : SwingTextField = SwingTextField { columns: 10 text: "Add new note" editable: true } override function create():Node{ return Group{ content:[ newNote, RoundButton{ layoutX: 150; layoutY: 0; buttonType:1; action: function(){ notetext = "{notetext} \n } }
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{newNotetext}";
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Custom Nodes and Overriding
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Text{ x: 0; y: 35; content: bind notetext; } ] } } }
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With the Notesfx script completed, it is time to use it Edit the 11fx file you used in the last section to display the Notes class rather than RoundButton Your new 11fx script should look like this:
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/* * 11fx * * v10 - J F DiMarzio * * 6/23/2010 created * * Custom Nodes and Overriding * */ package comjfdimarziojavafxforbeginners; import javafxstageStage; import javafxsceneScene;
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/** * @author JFDiMarzio */ Stage { title: "Override Node" onClose: function () { } scene: Scene { width: 200 height: 200 content: [Notes { } ] } }
JavaFX: A Beginner s Guide
Compile and run this script You should see your custom node, as shown in Figure 11-3
/* * 11fx * * v10 - J F DiMarzio * * 6/23/2010 created * * Custom Nodes and Overriding * */ package comjfdimarziojavafxforbeginners; import javafxstageStage; import javafxsceneScene; /** * @author JFDiMarzio */ Stage { title: "Override Node" onClose: function () { } scene: Scene { width: 200 height: 200 content: [Notes { } ] } }
Figure 11-3
The custom Notes node
11:
Custom Nodes and Overriding
Figure 11-4
The Notes node with notes entered
This custom node is set up with a text field for you to enter notes in and a button to add the notes Enter a few notes, hitting the + button after each note You should see your notes stack up as shown in Figure 11-4
Try This
Create Your Own Shapes
In this chapter you used a mask to create a round button For an added challenge, try this exercise to expand your knowledge Create a new project and, using the skills you gained from this chapter, create different shapes of different nodes Experiment with triangular buttons, rounded-corner text boxes, and other nontraditional shapes Then, using the RoundButton example, create a custom node of your new shape and use it in a Scene
In the next chapter you will learn how to embed music and videos in your scripts
11 Self Test
1 What process lets you take methods and properties from one class and change their
default actions and behaviors
2 When you re creating a class, what keyword forces your class to inherit the methods
and properties of another
JavaFX: A Beginner s Guide
3 In the following example, what will a call to YourDogdisplayBreed print
public class MyDog extends Dog{ override function displayBreed(){ println("Elkhound"); } } public class YourDog extends Dog{ }
4 True or false Ensuring that your files are all in the same package will make referencing
them easier
5 True or false After inheriting from a class, only attributes you override are available to
you in another class
6 What trigger will execute when an attribute changes 7 What statement will take an expression for a true or false result and then execute code
accordingly
8 True or false You have to call a custom-created node from a script to use it 9 What node do you inherit from to create a custom node 10 What method of CustomNode do you override to return your node to the calling script
12
Embedded Video and Music
JavaFX: A Beginner s Guide
Key Skills & Concepts
Adding video to an app Inverse binding Using the MediaPlayer
ith the abundance of business and sites built around streaming media, it is only natural that JavaFX allow you to take full advantage of video and audio media In the past, programming an application to play any kind of media meant hours of writing controls, finding the right codecs for the files you wanted to play, and writing parsers to read the media files It was long and arduous work that you would really only attempt if you were completely confident in your abilities as a programmer JavaFX has packaged a few nodes that make working with media files as easy as possible In this chapter you learn about the MediaView and MediaPlayer nodes You use these nodes to write apps that display video, play audio, and allow users a level of control over the media they choose to play In the first section, you learn how MediaView and MediaPlayer can be used together to play a video file However, before you begin, you need to create a new, empty JavaFX script Your script should appear as follows:
/* * 12fx * * v10 - J F DiMarzio * * 6/25/2010 created * * Embedded Video and Music * */ package comjfdimarziojavafxforbeginners; /** * @author JFDiMarzio */
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