Java JTextComponent Insert insertLineBefore(JTextComponent textComponent)

Description

insert Line Before

License

Open Source License

Declaration

public static void insertLineBefore(JTextComponent textComponent) 

Method Source Code

//package com.java2s;
/*//from w ww .j  ava 2s  .c o  m
 * 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 insertLineBefore(JTextComponent textComponent) {
        int caretIndex = textComponent.getCaretPosition();
        int insertIndex = -1;
        char newLine = '\n';

        String text = textComponent.getText();
        char[] textChars = text.toCharArray();

        for (int i = 0; i < textChars.length; i++) {

            if (i > caretIndex) {
                break;
            }

            else {

                if (textChars[i] == newLine)
                    insertIndex = i;

            }

        }

        StringBuilder sb = new StringBuilder(text);
        sb.insert(insertIndex == -1 ? 0 : insertIndex, newLine);

        textComponent.setText(sb.toString());
        textComponent.setCaretPosition(insertIndex + 1);
    }
}

Related

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