de.bund.bfr.knime.ui.StringTextArea.java Source code

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Here is the source code for de.bund.bfr.knime.ui.StringTextArea.java

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/*******************************************************************************
 * Copyright (c) 2016 German Federal Institute for Risk Assessment (BfR)
 *
 * 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.ui;

import java.awt.Color;
import java.util.stream.Stream;

import javax.swing.BorderFactory;
import javax.swing.JTextArea;
import javax.swing.event.DocumentListener;

import com.google.common.base.Strings;

import de.bund.bfr.knime.UI;

public class StringTextArea extends JTextArea implements TextInput {

    private static final long serialVersionUID = 1L;

    private static final Color INVALID_COLOR = Color.RED;
    private static final Color BACKGROUND_COLOR;
    private static final Color FOREGROUND_COLOR;
    private static final Color NOT_ENABLED_BACKGROUND_COLOR;
    private static final Color NOT_ENABLED_FOREGROUND_COLOR;

    static {
        JTextArea area = new JTextArea();

        BACKGROUND_COLOR = area.getBackground();
        FOREGROUND_COLOR = area.getForeground();

        area.setEnabled(false);

        NOT_ENABLED_BACKGROUND_COLOR = area.getBackground();
        NOT_ENABLED_FOREGROUND_COLOR = area.getForeground();
    }

    private DocumentListener documentListener;
    private boolean optional;
    private boolean valueValid;
    private String value;

    public StringTextArea(boolean optional, int rows, int columns) {
        super(null, null, rows, columns);
        this.optional = optional;
        setLineWrap(true);
        setBorder(BorderFactory.createLoweredBevelBorder());
        getDocument().addDocumentListener(documentListener = UI.newDocumentActionListener(e -> textChanged()));
        textChanged();
    }

    @Override
    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        getDocument().removeDocumentListener(documentListener);
        setText(Strings.nullToEmpty(value));
        getDocument().addDocumentListener(documentListener);
        textChanged();
    }

    @Override
    public boolean isOptional() {
        return optional;
    }

    @Override
    public boolean isValueValid() {
        return valueValid;
    }

    @Override
    public void addTextListener(TextListener listener) {
        listenerList.add(TextListener.class, listener);
    }

    @Override
    public void removeTextListener(TextListener listener) {
        listenerList.remove(TextListener.class, listener);
    }

    @Override
    public Color getForeground() {
        if (isEnabled()) {
            return !valueValid ? INVALID_COLOR : FOREGROUND_COLOR;
        } else {
            return NOT_ENABLED_FOREGROUND_COLOR;
        }
    }

    @Override
    public Color getBackground() {
        if (isEnabled()) {
            boolean hasText = getDocument() != null && !getText().trim().isEmpty();

            return !valueValid && !hasText ? INVALID_COLOR : BACKGROUND_COLOR;
        } else {
            return NOT_ENABLED_BACKGROUND_COLOR;
        }
    }

    private void textChanged() {
        value = Strings.emptyToNull(getText().trim());
        valueValid = value != null || optional;
        Stream.of(getListeners(TextListener.class)).forEach(l -> l.textChanged(this));
    }
}