FieldValidator.java Source code

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Here is the source code for FieldValidator.java

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/*
* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
*   - Redistributions of source code must retain the above copyright
*     notice, this list of conditions and the following disclaimer.
*
*   - Redistributions in binary form must reproduce the above copyright
*     notice, this list of conditions and the following disclaimer in the
*     documentation and/or other materials provided with the distribution.
*
*   - Neither the name of Oracle or the names of its
*     contributors may be used to endorse or promote products derived
*     from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
import java.awt.*;
import java.text.*;

import javax.swing.*;
import javax.swing.plaf.LayerUI;

public class FieldValidator extends JPanel {
    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createUI();
            }
        });
    }

    public static void createUI() {
        JFrame f = new JFrame("FieldValidator");

        JComponent content = createContent();

        f.add(content);

        f.pack();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    private static JComponent createContent() {
        Dimension labelSize = new Dimension(80, 20);

        Box box = Box.createVerticalBox();

        // A single LayerUI for all the fields.
        LayerUI<JFormattedTextField> layerUI = new ValidationLayerUI();

        // Number field.
        JLabel numberLabel = new JLabel("Number:");
        numberLabel.setHorizontalAlignment(SwingConstants.RIGHT);
        numberLabel.setPreferredSize(labelSize);

        NumberFormat numberFormat = NumberFormat.getInstance();
        JFormattedTextField numberField = new JFormattedTextField(numberFormat);
        numberField.setColumns(16);
        numberField.setFocusLostBehavior(JFormattedTextField.PERSIST);
        numberField.setValue(42);

        JPanel numberPanel = new JPanel();
        numberPanel.add(numberLabel);
        numberPanel.add(new JLayer<JFormattedTextField>(numberField, layerUI));

        // Date field.
        JLabel dateLabel = new JLabel("Date:");
        dateLabel.setHorizontalAlignment(SwingConstants.RIGHT);
        dateLabel.setPreferredSize(labelSize);

        DateFormat dateFormat = DateFormat.getDateInstance();
        JFormattedTextField dateField = new JFormattedTextField(dateFormat);
        dateField.setColumns(16);
        dateField.setFocusLostBehavior(JFormattedTextField.PERSIST);
        dateField.setValue(new java.util.Date());

        JPanel datePanel = new JPanel();
        datePanel.add(dateLabel);
        datePanel.add(new JLayer<JFormattedTextField>(dateField, layerUI));

        // Time field.
        JLabel timeLabel = new JLabel("Time:");
        timeLabel.setHorizontalAlignment(SwingConstants.RIGHT);
        timeLabel.setPreferredSize(labelSize);

        DateFormat timeFormat = DateFormat.getTimeInstance();
        JFormattedTextField timeField = new JFormattedTextField(timeFormat);
        timeField.setColumns(16);
        timeField.setFocusLostBehavior(JFormattedTextField.PERSIST);
        timeField.setValue(new java.util.Date());

        JPanel timePanel = new JPanel();
        timePanel.add(timeLabel);
        timePanel.add(new JLayer<JFormattedTextField>(timeField, layerUI));

        // Put them all in the box.
        box.add(Box.createGlue());
        box.add(numberPanel);
        box.add(Box.createGlue());
        box.add(datePanel);
        box.add(Box.createGlue());
        box.add(timePanel);

        return box;
    }
}

class ValidationLayerUI extends LayerUI<JFormattedTextField> {
    @Override
    public void paint(Graphics g, JComponent c) {
        super.paint(g, c);

        JLayer jlayer = (JLayer) c;
        JFormattedTextField ftf = (JFormattedTextField) jlayer.getView();
        if (!ftf.isEditValid()) {
            Graphics2D g2 = (Graphics2D) g.create();

            // Paint the red X.
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            int w = c.getWidth();
            int h = c.getHeight();
            int s = 8;
            int pad = 4;
            int x = w - pad - s;
            int y = (h - s) / 2;
            g2.setPaint(Color.red);
            g2.fillRect(x, y, s + 1, s + 1);
            g2.setPaint(Color.white);
            g2.drawLine(x, y, x + s, y + s);
            g2.drawLine(x, y + s, x + s, y);

            g2.dispose();
        }
    }
}