source: trunk/src_apollo/org/apollo/gui/TimeAxisPanel.java@ 315

package org.apollo.gui;

import java.awt.Event;
import java.awt.Graphics;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.sound.sampled.AudioFormat;
import javax.swing.JPanel;

import org.apollo.util.AudioMath;

/**
 * A time scale along the X axis that can be rendered.
 * 
 * Observes a SampledTrackGraphView - keeps time axis consistent with
 * current time scale on the observed SampledTrackGraphView.
 * 
 * @author Brook Novak
 *
 */
public class TimeAxisPanel extends JPanel implements TimelineChangeListener, MouseListener {
        
        private static final long serialVersionUID = 1L;
        
        private SampledTrackGraphView observedSubject;
        
        private TimeAxis timeAxis = new TimeAxis();
        
        public TimeAxisPanel(SampledTrackGraphView graph) {
                assert (graph != null);
                
                observedSubject = graph;
                graph.addTimeScaleChangeListener(this); // observe
                
                // Auto-adjust scale when component resizes.
                this.addComponentListener(new ComponentListener() {

                        public void componentHidden(ComponentEvent e) {
                        }

                        public void componentMoved(ComponentEvent e) {
                        }

                        public void componentResized(ComponentEvent e) {
                                updateAxis();
                        }

                        public void componentShown(ComponentEvent e) {
                        }
                
                });
                
                updateAxis();
        }
        

        public void timelineChanged(Event e) {
                 updateAxis();
        }
        

        private void updateAxis() {
                
                // Is track model even set yet?
                if (observedSubject.getSampledTrackModel() == null ||
                                getWidth() == 0) return;
                
                AudioFormat format = observedSubject.getSampledTrackModel().getFormat();
                
                long startTimeMS = AudioMath.framesToMilliseconds(
                                observedSubject.getTimeScaleStart(), format);
                
                long timeLengthMS = AudioMath.framesToMilliseconds(
                                observedSubject.getTimeScaleLength(), format);
                
                long totalTrackMSLength = AudioMath.framesToMilliseconds(
                                observedSubject.getSampledTrackModel().getFrameCount(), format);
                
                timeAxis.setAxis(
                                startTimeMS, 
                                timeLengthMS, 
                                observedSubject.getTimeScaleLength(), 
                                totalTrackMSLength, 
                                getWidth());
                
                repaint();
                
        }
        
        @Override
        public void paint(Graphics g) {
                timeAxis.paint(g, 0, 0, getHeight(), getBackground());
        }

        /** BELOW: TRAPS MOUSE EVENTS TO GIVE FOCUS */
        public void mouseClicked(MouseEvent e) {
        }
        public void mouseEntered(MouseEvent e) {
        }
        public void mouseExited(MouseEvent e) {
        }
        public void mousePressed(MouseEvent e) {
        }
        public void mouseReleased(MouseEvent e) {
        }
}