SiLeBAT/FSK-Lab

/*******************************************************************************
 * Copyright (c) 2015 Federal Institute for Risk Assessment (BfR), Germany
 *
 * 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
 * (at your option) 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/>.
 *
 * Contributors:
 *     Department Biological Safety - BfR
 *******************************************************************************/
package de.bund.bfr.knime.pmm.common.ui;

import java.awt.Color;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JTextField;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;

public class DoubleTextField extends JTextField implements DocumentListener,
        FocusListener {

    private static final long serialVersionUID = 1L;

    private double minValue;
    private double maxValue;
    private boolean optional;

    private boolean isValueValid;
    private Double value;

    private List<TextListener> listeners;

    public DoubleTextField() {
        this(Double.NEGATIVE_INFINITY, Double.POSITIVE_INFINITY, false);
    }

    /*
     * @param optional defines whether the value can also be left empty.
     */
    public DoubleTextField(boolean optional) {
        this(Double.NEGATIVE_INFINITY, Double.POSITIVE_INFINITY, optional);
    }

    public DoubleTextField(double minValue, double maxValue) {
        this(minValue, maxValue, false);
    }

    public DoubleTextField(double minValue, double maxValue, boolean optional) {
        this.minValue = minValue;
        this.maxValue = maxValue;
        this.optional = optional;
        getDocument().addDocumentListener(this);
        addFocusListener(this);
        listeners = new ArrayList<>();
        textChanged();
        formatText();
    }

    public void addTextListener(TextListener listener) {
        listeners.add(listener);
    }

    public void removeTextListener(TextListener listener) {
        listeners.remove(listener);
    }

    public boolean isValueValid() {
        return isValueValid;
    }

    public Double getValue() {
        return value;
    }

    public void setValue(Double value) {
        if (value != null) {
            setText(value.toString());
        } else {
            setText("");
        }

        formatText();
        setCaretPosition(0);
    }

    @Override
    public void insertUpdate(DocumentEvent e) {
        textChanged();
    }

    @Override
    public void removeUpdate(DocumentEvent e) {
        textChanged();
    }

    @Override
    public void changedUpdate(DocumentEvent e) {
        textChanged();
    }

    @Override
    public void focusGained(FocusEvent e) {
        selectAll();
    }

    @Override
    public void focusLost(FocusEvent e) {
        formatText();
    }

    @Override
    public Color getForeground() {
        if (!isValueValid && isEnabled()) {
            return Color.RED;
        } else {
            return super.getForeground();
        }
    }

    @Override
    public Color getBackground() {
        if (!isValueValid && isEnabled() && getDocument() != null
                && getText().trim().isEmpty()) {
            return Color.RED;
        } else {
            return super.getBackground();
        }
    }

    protected void formatText() {
        if (value != null) {
            setText(getText().replace(",", "."));
        }
    }

    private void textChanged() {
        if (getText().trim().isEmpty()) {
            value = null;

            if (optional) {
                isValueValid = true;
            } else {
                isValueValid = false;
            }
        } else {
            try {
                value = Double.parseDouble(getText().replace(",", "."));

                if (value >= minValue && value <= maxValue) {
                    isValueValid = true;
                } else {
                    isValueValid = false;
                }
            } catch (NumberFormatException e) {
                value = null;
                isValueValid = false;
            }
        }

        for (TextListener listener : listeners) {
            listener.textChanged(this);
        }
    }

}