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QuickFIX/J example application - Banzai

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/*******************************************************************************
 * Copyright (c) quickfixengine.org  All rights reserved.
 *
 * This file is part of the QuickFIX FIX Engine
 *
 * This file may be distributed under the terms of the quickfixengine.org
 * license as defined by quickfixengine.org and appearing in the file
 * LICENSE included in the packaging of this file.
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING
 * THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE.
 *
 * See http://www.quickfixengine.org/LICENSE for licensing information.
 *
 * Contact [email protected] if any conditions of this licensing
 * are not clear to you.
 ******************************************************************************/

package quickfix.examples.banzai;

import javax.swing.*;
import java.awt.event.KeyEvent;

public class DoubleNumberTextField extends JTextField {

    public void processKeyEvent(KeyEvent e) {
        char keyChar = e.getKeyChar();
        if (((keyChar >= '0') && (keyChar <= '9')) ||
                (keyChar == 8) || (keyChar == 127)) {
            super.processKeyEvent(e);
        } else if (keyChar == '.') {
            String text = getText();
            if (!text.contains(".")) {
                super.processKeyEvent(e);
            }
        }
    }

}