001    // License: GPL. Copyright 2007 by Immanuel Scholz and others
002    package org.openstreetmap.josm.actions.mapmode;
003    
004    import static org.openstreetmap.josm.tools.I18n.tr;
005    
006    import java.awt.Cursor;
007    import java.awt.Point;
008    import java.awt.event.MouseEvent;
009    
010    import org.openstreetmap.josm.Main;
011    import org.openstreetmap.josm.data.coor.EastNorth;
012    import org.openstreetmap.josm.gui.layer.markerlayer.PlayHeadMarker;
013    
014    /**
015     * Singleton marker class to track position of audio.
016     *
017     * @author david.earl
018     *
019     */
020    public class PlayHeadDragMode extends MapMode {
021    
022        private boolean dragging = false;
023        private Point mousePos = null;
024        private Point mouseStart = null;
025        private PlayHeadMarker playHeadMarker = null;
026    
027        public PlayHeadDragMode(PlayHeadMarker m) {
028            super(tr("Drag play head"), "playheaddrag", tr("Drag play head"), null,
029                    Main.map, Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
030            playHeadMarker = m;
031        }
032    
033        @Override public void enterMode() {
034            super.enterMode();
035            Main.map.mapView.addMouseListener(this);
036            Main.map.mapView.addMouseMotionListener(this);
037        }
038    
039        @Override public void exitMode() {
040            super.exitMode();
041            Main.map.mapView.removeMouseListener(this);
042            Main.map.mapView.removeMouseMotionListener(this);
043        }
044    
045        @Override public void mousePressed(MouseEvent ev) {
046            mouseStart = mousePos = ev.getPoint();
047        }
048    
049        @Override public void mouseDragged(MouseEvent ev) {
050            if (mouseStart == null || mousePos == null) return;
051            if ((ev.getModifiersEx() & MouseEvent.BUTTON1_DOWN_MASK) == 0) return;
052            Point p = ev.getPoint();
053            if (p == null) return;
054            if (! dragging) {
055                if (p.distance(mouseStart) < 3) return;
056                playHeadMarker.startDrag();
057                dragging = true;
058            }
059            if (p.distance(mousePos) == 0) return;
060            playHeadMarker.drag(Main.map.mapView.getEastNorth(ev.getX(), ev.getY()));
061            mousePos = p;
062        }
063    
064        @Override public void mouseReleased(MouseEvent ev) {
065            Point p = ev.getPoint();
066            mouseStart = null;
067            if (ev.getButton() != MouseEvent.BUTTON1 || p == null || ! dragging)
068                return;
069    
070            updateKeyModifiers(ev);
071    
072            EastNorth en = Main.map.mapView.getEastNorth(ev.getX(), ev.getY());
073            if (! shift) {
074                playHeadMarker.reposition(en);
075            } else {
076                playHeadMarker.synchronize(en);
077            }
078            mousePos = null;
079            dragging = false;
080        }
081    
082        @Override public String getModeHelpText() {
083            return tr("Drag play head and release near track to play audio from there; SHIFT+release to synchronize audio at that point.");
084        }
085    }