Java JTextComponent Select selectLines(JTextComponent target)

Description

If the selection is multi lined, then the full lines are selected, otherwise, nothing is done.

License

Apache License

Parameter

Parameter	Description
target	a parameter

Return

true if the selection is multi-line, or a whole line

Declaration

public static boolean selectLines(JTextComponent target) 

Method Source Code

//package com.java2s;
/*/*ww  w .ja va 2  s.  co  m*/
 * Copyright 2008 Ayman Al-Sairafi ayman.alsairafi@gmail.com
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License 
 *       at http://www.apache.org/licenses/LICENSE-2.0 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License.  
 */

import javax.swing.text.Element;
import javax.swing.text.JTextComponent;
import javax.swing.text.PlainDocument;

public class Main {
    /**
     * If the selection is multi lined, then the full lines are selected,
     * otherwise, nothing is done.
     * @param target
     * @return true if the selection is multi-line, or a whole line
     */
    public static boolean selectLines(JTextComponent target) {
        if (target.getSelectionStart() == target.getSelectionEnd()) {
            return false;
        }
        PlainDocument pDoc = (PlainDocument) target.getDocument();
        Element es = pDoc.getParagraphElement(target.getSelectionStart());
        // if more than one line is selected, we need to subtract one from the end
        // so that we do not select the line with the caret and no selection in it
        Element ee = pDoc.getParagraphElement(target.getSelectionEnd() - 1);
        if (es.equals(ee) && ee.getEndOffset() != target.getSelectionEnd()) {
            return false;
        }
        int start = es.getStartOffset();
        int end = ee.getEndOffset();
        target.select(start, end - 1);
        return true;
    }
}

Related

1. selectAll(JTextComponent textComponent)
2. selectAllOnFocus(JTextComponent textComponent)
3. selectAndRequestFocus(JTextComponent editor)
4. selectFirstArg(String strText, int initialSelectionStart, JTextComponent editor)
5. selectionToUpperCase(JTextComponent textPane)
6. toggleSelectionUpperCase(JTextComponent textPane)
7. useSelectedTextColor(Highlighter.Highlight h, JTextComponent c)