Java JTextComponent Caret selectLineAtCaret(JTextComponent editor)

Description

select Line At Caret

License

Apache License

Declaration

public static void selectLineAtCaret(JTextComponent editor) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import javax.swing.text.JTextComponent;

public class Main {
    public static void selectLineAtCaret(JTextComponent editor) {
        int lineStart = getLineStart(editor.getText(), editor.getCaretPosition());
        int lineEnd = getLineEnd(editor.getText(), editor.getCaretPosition());
        if (lineEnd < editor.getText().length()) {
            lineEnd++;// w w w.  j  a  va  2s.  c  o m
        }
        editor.getCaret().setDot(lineEnd);
        editor.getCaret().moveDot(lineStart);
    }

    public static int getLineStart(String text, int initialCaretPosition) {
        int pos = Math.min(Math.max(0, initialCaretPosition), text.length());
        while (pos > 0) {
            if (text.charAt(pos - 1) == '\n') {
                break;
            }
            pos--;
        }
        return pos;
    }

    public static int getLineEnd(String text, int initialCaretPosition) {
        int pos = Math.min(Math.max(0, initialCaretPosition), text.length());
        while (pos < text.length()) {
            if (text.charAt(pos) == '\n') {
                break;
            }
            pos++;
        }
        return pos;
    }
}

Related

1. getCaretCol(int idx, JTextComponent comp)
2. getCaretRow(int idx, JTextComponent comp)
3. getLineAtCaret(final JTextComponent component)
4. makeCaretAlwaysVisible(final JTextComponent comp)
5. setCaretUpdateEnabled(JTextComponent comp, boolean updateEnabled)
6. setTextAndResetCaret(JTextComponent component, String text)