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There is a newer version: 6.2.2
package org.icepdf.ri.common.views.annotations;

/*
 * Copyright 2006-2016 ICEsoft Technologies Inc.
 *
 * 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 org.icepdf.ri.util.jxlayer.JXLayer;
import org.icepdf.ri.util.jxlayer.plaf.LayerUI;

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.geom.AffineTransform;


/**
 * FreeTextArea extends JTextArea overriding key method need to insure that
 * when the parent graphic context is scaled the FreeText area mouse events
 * are also taken into account.
 *
 * @since 5.0.2
 */
@SuppressWarnings("serial")
public class FreeTextArea extends JTextArea {

    public interface ZoomProvider {
        public float getZoom();
    }

    private ZoomProvider zoomProvider;
    private boolean active;
    public FreeTextArea(final ZoomProvider zoomProvider) {
        super();
        this.zoomProvider = zoomProvider;
        // enable more precise painting of glyphs.
        getDocument().putProperty("i18n", Boolean.TRUE.toString());
        putClientProperty("i18n", Boolean.TRUE.toString());
        LayerUI layerUI = new LayerUI() {
            @SuppressWarnings("unchecked")
            @Override
            public void installUI(JComponent c) {
                super.installUI(c);
                // enable mouse motion events for the layer's sub components
                ((JXLayer) c).setLayerEventMask(
                        AWTEvent.MOUSE_MOTION_EVENT_MASK | AWTEvent.MOUSE_EVENT_MASK);
            }

            @SuppressWarnings("unchecked")
            @Override
            public void uninstallUI(JComponent c) {
                super.uninstallUI(c);
                // reset the layer event mask
                ((JXLayer) c).setLayerEventMask(0);
            }

            @Override
            public void eventDispatched(AWTEvent ae, JXLayer l) {
                MouseEvent e = (MouseEvent) ae;
                // transform the point in MouseEvent using the current zoom factor
                float zoom = FreeTextArea.this.zoomProvider.getZoom();
                MouseEvent newEvent = new MouseEvent((Component) e.getSource(),
                        e.getID(), e.getWhen(), e.getModifiers(),
                        (int) (e.getX() / zoom), (int) (e.getY() / zoom),
                        e.getClickCount(), e.isPopupTrigger(), e.getButton());
                // consume the MouseEvent and then process the modified event
                e.consume();
                FreeTextArea.this.processMouseEvent(newEvent);
                FreeTextArea.this.processMouseMotionEvent(newEvent);
            }
        };
        new JXLayer(this, layerUI);
    }

    @Override
    protected void paintBorder(Graphics g) {
        if (!active) {
            return;
        }
        super.paintBorder(g);
    }

    @Override
    protected void paintComponent(Graphics g) {
        if (!active) {
            return;
        }
        float zoom = this.zoomProvider.getZoom();
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        g2.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
        AffineTransform old = g2.getTransform();
        g2.scale(zoom, zoom);
        // paint the component at the scale of the page.
        super.paintComponent(g2);
        g2.setTransform(old);
    }

    public void repaint(int x, int y, int width, int height) {
        super.repaint(0, 0, getWidth(), getHeight());
    }

    public boolean isActive() {
        return active;
    }

    public void setActive(boolean active) {
        this.active = active;
    }
}