source: josm/trunk/src/org/openstreetmap/josm/actions/mapmode/PlayHeadDragMode.java@ 627

// License: GPL. Copyright 2007 by Immanuel Scholz and others
package org.openstreetmap.josm.actions.mapmode;

import static org.openstreetmap.josm.tools.I18n.tr;

import java.awt.Cursor;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.MouseEvent;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.coor.EastNorth;
import org.openstreetmap.josm.gui.layer.markerlayer.PlayHeadMarker;

/**
 * Singleton marker class to track position of audio.
 * 
 * @author david.earl
 *
 */
public class PlayHeadDragMode extends MapMode {

        private boolean dragging = false;
        private Point mousePos = null;
        private Point mouseStart = null;
        private PlayHeadMarker playHeadMarker = null;
        
        public PlayHeadDragMode(PlayHeadMarker m) {
                super("play head drag", "playheaddrag", "play head trag", 0, Main.map, Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
                playHeadMarker = m;
        }
        
        @Override public void enterMode() {
                super.enterMode();
                Main.map.mapView.addMouseListener(this);
                Main.map.mapView.addMouseMotionListener(this);
        }

        @Override public void exitMode() {
                super.exitMode();
                Main.map.mapView.removeMouseListener(this);
                Main.map.mapView.removeMouseMotionListener(this);
        }

        @Override public void mousePressed(MouseEvent ev) {
                mouseStart = mousePos = ev.getPoint();
        }

        @Override public void mouseDragged(MouseEvent ev) {
                if (mouseStart == null || mousePos == null) return;
                if ((ev.getModifiersEx() & MouseEvent.BUTTON1_DOWN_MASK) == 0) return;
                Point p = ev.getPoint();
                if (p == null) return;
                if (! dragging) {
                        if (p.distance(mouseStart) < 3) return;
                        playHeadMarker.startDrag();
                        dragging = true;
                }
                if (p.distance(mousePos) == 0) return;
                playHeadMarker.drag(Main.map.mapView.getEastNorth(ev.getX(), ev.getY()));
                mousePos = p;
        }

        @Override public void mouseReleased(MouseEvent ev) {
                Point p = ev.getPoint();
                mouseStart = null;
                if (ev.getButton() != MouseEvent.BUTTON1 || p == null || ! dragging)
                        return;
                boolean shift = (ev.getModifiers() & ActionEvent.SHIFT_MASK) != 0;
                EastNorth en = Main.map.mapView.getEastNorth(ev.getX(), ev.getY());
                if (! shift) {
                        playHeadMarker.reposition(en);
                } else {
                        playHeadMarker.synchronize(en);
                }
                mousePos = null;        
                dragging = false;

        /*
                boolean ctrl = (e.getModifiers() & ActionEvent.CTRL_MASK) != 0;
                boolean alt = (e.getModifiers() & ActionEvent.ALT_MASK) != 0;
         */
        }

        @Override public String getModeHelpText() {
                return tr("Drag play head and release near track to play audio from there; SHIFT+release to synchronize audio at that point.");
        }
}