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A java library for reading/writing/manipulating epub files

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package nl.siegmann.epublib.viewer;

import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import nl.siegmann.epublib.browsersupport.NavigationEvent;
import nl.siegmann.epublib.browsersupport.NavigationEventListener;
import nl.siegmann.epublib.browsersupport.Navigator;
import nl.siegmann.epublib.domain.Book;

// package
class SpineSlider extends JSlider implements NavigationEventListener {

		/**
		 * 
		 */
		private static final long serialVersionUID = 8436441824668551056L;
		private final Navigator navigator;

		public SpineSlider(Navigator navigator) {
			super(JSlider.HORIZONTAL);
			this.navigator = navigator;
			navigator.addNavigationEventListener(this);
			setPaintLabels(false);
			addChangeListener(new ChangeListener() {
				public void stateChanged(ChangeEvent evt) {
					JSlider slider = (JSlider) evt.getSource();
					int value = slider.getValue();
					SpineSlider.this.navigator.gotoSpineSection(value, SpineSlider.this);
				}
			});
			initBook(navigator.getBook());
		}

		private void initBook(Book book) {
			if (book == null) {
				return;
			}
			super.setMinimum(0);
			super.setMaximum(book.getSpine().size() - 1);
			super.setValue(0);
//			setPaintTicks(true);
			updateToolTip();
		}

		private void updateToolTip() {
			String tooltip = "";
			if (navigator.getCurrentSpinePos() >= 0 && navigator.getBook() != null) {
				tooltip = String.valueOf(navigator.getCurrentSpinePos() + 1) + " / " + navigator.getBook().getSpine().size();
			}
			setToolTipText(tooltip);
		}

		@Override
		public void navigationPerformed(NavigationEvent navigationEvent) {
			updateToolTip();
			if (this == navigationEvent.getSource()) {
				return;
			}

			if (navigationEvent.isBookChanged()) {
				initBook(navigationEvent.getCurrentBook());
			} else if (navigationEvent.isResourceChanged()) {
				setValue(navigationEvent.getCurrentSpinePos());
			}
		}

	}