Java Community | Help. Code. Learn.•12mo ago

How do I append text to a JTextPane?

I've only used JTextAreas in the past, but my current project needs colored text, so I need to use JTextPane or JEditorPane. From googling JTextPane seems simpler but I still cant understand how I actually add text

15 Replies

JavaBot•12mo ago

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imp_o_rt•12mo ago

jtextpane and jtextarea are both JTextComponents which have a getText/setText method: https://docs.oracle.com/en/java/javase/17/docs/api/java.desktop/javax/swing/text/JTextComponent.html#setText(java.lang.String)

JTextComponent (Java SE 17 & JDK 17)

declaration: module: java.desktop, package: javax.swing.text, class: JTextComponent

imp_o_rt•12mo ago

So you can use

myPane.setText(myPane.getText() + " and some more text!")

myPane.setText(myPane.getText() + " and some more text!")

blockgoblin31OP•12mo ago

but how would I use that to color specific parts of the text? wouldn't that color the whole thing then the text is set?

imp_o_rt•12mo ago

Ah. I think in that case you will need to mess with the StyleContext - did you see this? https://stackoverflow.com/questions/15727836/is-it-possible-to-color-only-a-portion-of-jtextpane

Stack Overflow

Is it possible to color only a portion of JTextpane?

Hi I am trying to find out whether it is possible to apply background color only to a portion of JTextpane? For example if I have a JTextpane of size 300 X 400 then can I apply some color to a port...

blockgoblin31OP•12mo ago

no, I was mostly working from this https://stackoverflow.com/questions/9650992/how-to-change-text-color-in-the-jtextarea

Stack Overflow

How to change text color in the JTextArea?

I need to know how to do this: Let's say: I have a code in the JTextArea like this: LOAD R1, 1 DEC R1 STORE M, R1 ADD R4, R1,8 I wanted to change the color of LOAD, DEC, STORE and ADD to color B...

blockgoblin31OP•12mo ago

I just cant figure out what that's doing to add more text and what you linked is using the same code pretty much

imp_o_rt•12mo ago

This bit at the bottom:

int len = tp.getDocument().getLength();
tp.setCaretPosition(len);
tp.setCharacterAttributes(aset,  false);
tp.replaceSelection(msg);

int len = tp.getDocument().getLength();
tp.setCaretPosition(len);
tp.setCharacterAttributes(aset,  false);
tp.replaceSelection(msg);

1. Sets the caret to the end (i.e. where you want to insert text) 2. Sets the requested attributes at that position 3. Writes the message at that position

blockgoblin31OP•12mo ago

ok, I think that makes sense how do I set the default side of the window? in columns and rows also it isn't working using this code

        set = context.addAttribute(set, StyleConstants.Foreground, s.getColor());
        int length = getDocument().getLength();
        setCaretPosition(length);
        setCharacterAttributes(set, false);
        replaceSelection(String.valueOf(s.getText()));

        set = context.addAttribute(set, StyleConstants.Foreground, s.getColor());
        int length = getDocument().getLength();
        setCaretPosition(length);
        setCharacterAttributes(set, false);
        replaceSelection(String.valueOf(s.getText()));

s is just a wrapper for a Color and a char set is an AttributeSet where im just changing out the color

blockgoblin31OP•12mo ago

actually heres the full class

TextArea.java

blockgoblin31OP•12mo ago

and here's Symbol.java

Symbol.java

blockgoblin31OP•12mo ago

@imp_o_rt

JavaBot•12mo ago

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blockgoblin31OP•12mo ago

bump

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How do I append text to a JTextPane?

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