Java JTextComponent Insert insertLineAfter(JTextComponent textComponent)

Description

insert Line After

License

Open Source License

Declaration

public static void insertLineAfter(JTextComponent textComponent) 

Method Source Code

//package com.java2s;
/*//from   w ww.j  a  va  2s.  c om
 * TextUtilities.java
 *
 * Copyright (C) 2002-2015 Takis Diakoumis
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 */

import javax.swing.text.JTextComponent;

public class Main {
    public static void insertLineAfter(JTextComponent textComponent) {
        String newLine = "\n";
        int caretIndex = textComponent.getCaretPosition();

        StringBuilder sb = new StringBuilder(textComponent.getText());

        int endOfLineIndex = sb.indexOf(newLine, caretIndex);

        int length = sb.length();

        if (caretIndex == length || endOfLineIndex == length)
            sb.append(newLine);
        else
            sb.insert(endOfLineIndex == -1 ? 0 : endOfLineIndex, newLine);

        textComponent.setText(sb.toString());
        textComponent.setCaretPosition(endOfLineIndex == -1 ? length : endOfLineIndex + 1);
        sb = null;
    }
}

Related

1. insert(final JTextComponent component, final String string)
2. insertLineBefore(JTextComponent textComponent)
3. insertMagicString(JTextComponent target, int dot, String toInsert)
4. insertSimpleTemplate(JTextComponent target, String template)
5. insertText(JTextComponent comp, String s)