How to get the number of lines from a jtextpane

Question

Is there a way of "extracting" the number of lines from a filled with text jtextpane? If there is, does it work if some of the lines are due to text wrapping?

Reimeus · Accepted Answer · 2013-09-22T20:02:43.760

15

You can use Utilities.getRowStart to determine the 'start' of the line for a JTextPane giving you a resulting lineCount. This will also work when the lines are wrapped.

int totalCharacters = textPane.getText().length(); 
int lineCount = (totalCharacters == 0) ? 1 : 0;

try {
   int offset = totalCharacters; 
   while (offset > 0) {
      offset = Utilities.getRowStart(textPane, offset) - 1;
      lineCount++;
   }
} catch (BadLocationException e) {
    e.printStackTrace();
}

edited Sep 22 '13 at 20:02

answered Dec 10 '12 at 19:38

Reimeus

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Just a note: "This will also work when the lines are wrapped." means that if a line gets wrapped automatically, the resulting number will be increased by the amount of wraps. So, when you eg. want to display line numbers, you have to check if a line really is a line or just displayed as a line because of automatic wrapping. – Bowi Jun 06 '17 at 11:14

score 5 · Answer 2 · answered Dec 10 '12 at 19:18

5

If you define a "line" as how many \n characters are there in a JTextPane text, then you could use:

JTextPane p = yourJTextPane;
System.out.println(p.getText().split("\n").length);

answered Dec 10 '12 at 19:18

Pablo Santa Cruz

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Thanks, though I already tried that. The problem is that when the jtextPane wraps a line, it seems that it doesn't put a "\n"? I can't really undestand why. – martin Dec 10 '12 at 19:35
No, it doesn't. If that's what you need, you can't use my answer. – Pablo Santa Cruz Dec 10 '12 at 19:45

score 0 · Answer 3 · answered May 27 '15 at 17:47

To jump to line that was selected, I used this code:

int rowSel = Integer.parseInt(tfGoLine.getText());

        int rowGo = 0;
        int lineCount = 0;
        int totalCharacters = rowSel <= 1 ? 0 : text.getText().length();

        try {
            int last = -1;
            for (int count = 0; count < totalCharacters; count++) {
                int offset = Utilities.getRowStart(text, count);

                if (last != offset) {
                    last = offset;
                    lineCount++;
                    rowGo = offset;

                    if (lineCount == rowSel) {
                        break;
                    }
                }
            }

        } catch (BadLocationException e) {
        }

        text.getCaret().setDot(rowGo);
        text.requestFocus();

score 0 · Answer 4 · edited May 12 '19 at 16:29

0

int rowCount =txtPane.getDocument().getDefaultRootElement().getElementCount();

edited May 12 '19 at 16:29

Zoe

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answered May 12 '19 at 16:25

Tom Eriksson

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How to get the number of lines from a jtextpane

4 Answers4