CODEWITHSUNDEEP
javaswingjtextareajeditorpane
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Reputation: 3

Prettyprint raised to numbers in JTextArea/JEditorPane

My program includes a GUI for polynomials, where they enter their polynomials in a JTextArea or JEditorPane.

I'm trying to find a way that whenever the user enters "^(a number)" in the text area that it changes the look to actually show that the number is being an exponent of a letter or number.

so for example n^2 would be seen as the number 2 representing that it is an exponent of n much better.

Upvotes: 0

Views: 46

Answers (1)

Joop Eggen
Joop Eggen

Reputation: 109613

Not in a JTextArea, but in a JEditorPane or JTextPane you can use a StyledDocument.

On key down event of ^ (KeyEvent.VK_CIRCUMFLEX) you add an HTML <sup>...</sup> probably with attribute styles on the StyledDocument.

This requires some work, as opposed to the ready math solutions of @Schokokuchen_Bäcker.

You could provide an edit icon for ^ like [x], especially as one some national keyboards ^ is a dead key to create letters like û. Even more work.

A change of character attribute for superscript then corresponds to a ^ in your representation.

As JTextPane is a child class of JEditorPane, I would use that one.

JTextPane textPane = new JTextPane(document);
textPane.setEditable(true);

Element elememt = doc.getCharacterElement(docOffset);
if (StyleConstants.isSuperscript(element.getAttributes())) { ...

One might use SimpleAttributeSet to compose attributes.

Upvotes: 0

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