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Custom Nodes and Overriding
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public class Notes extends CustomNode{ }
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Notice that the Notes class extends CustomNode This gives you a blank node to begin building on Now let s create a list of what we need to add to the Notes class to create a note-taking node: A variable to hold the note text A SwingTextField to enter the note text A RoundButton to add the note A Text node to display all the notes taken The first item on the list is to create a variable to hold the note text This will give the Text node something to bind to when displaying a list of notes To begin, create a var named notetext:
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public class Notes extends CustomNode{ var notetext: String; }
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Now, create a SwingTextField that you will use to enter your notes:
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javafxsceneCustomNode; public class Notes extends CustomNode{ var notetext: String; var newNote : SwingTextField = SwingTextField { columns: 10 text: "Add new note" editable: true } }
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So far this has been pretty straightforward However, now you need to tackle some work that has not been covered yet How do you display this SwingTextField CustomNodes do not hold Scenes and Stages in the way you are used to working with them Rather, nodes are created and used in scripts All nodes have a create method This method returns a node or group of nodes to whatever is calling (or creating) the node For example, if you use a Text node in a Scene, the Scene calls the create method of the Text node The create method does whatever work is needed to create the Text node and returns the created Text node to the Scene
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Therefore, to create your new Notes node, you will need to override the CustomNode s create method to return your new group of nodes:
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javafxextswingSwingTextField; public class Notes extends CustomNode{ var notetext: String; var newNote : SwingTextField = SwingTextField { columns: 10 text: "Add new note" editable: true } override function create():Node{ } }
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NOTE
Notice that the create() method is typed as :Node This tells you that the result of create returns a node
You will be returning a group of nodes through the create function because you are displaying more than one node to the screen In fact, you are displaying three different nodes Let s start building the create method The create method needs to build all three nodes as well as supply the action for the RoundButton to add notes This is a fairly easy process First, create the Node group:
javafxsceneGroup; override function create():Node{ return Group{ content:[ ] } }
Notice that the group contains a content attribute All the nodes you want to return will go within this content Start by adding your newNote SwingTextField:
override function create():Node{ return Group{ content:[ newNote, ] } }
11:
Custom Nodes and Overriding
Now, let s create a RoundButton This is the same RoundButton you created in the last section of this chapter Because this button is used for adding notes, set the buttonType to 1; this will create a button with + as the text Additionally, you need to create an anonymous function for the button s action The purpose of this function is to take the text of the SwingTextField and add it to the notetext variable being displayed:
override function create():Node{ return Group{ content:[ newNote, RoundButton{ layoutX: 150; layoutY: 0; buttonType:1; action: function(){ notetext = "{notetext} \n } } ] } }
{newNotetext}";
The only difference you see here with the implementation of the RoundButton is the addition of the action anonymous function This function sets notetext to the current contents of notetext plus a newline character (\n) and the current text of the newNote text field This displays each note entered on a new line, like this:
Note #1 Note #2 Note #3
Now, all you have to do is create a new Text node to display notetext Simply create a Text node whose context is bound to notetext:
Text{ x: 0; y: 35; content: bind notetext; }
Binding the content of the Text node will ensure that when notetext is updated by the RoundButton, the latest updates are displayed directly to the Text node So with very
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