MapViewGestureDetectorListener.java

package com.mapbox.mapboxsdk.views;

import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import com.mapbox.mapboxsdk.api.ILatLng;
import com.mapbox.mapboxsdk.util.constants.UtilConstants;

/**
 * A custom gesture detector that processes gesture events and dispatches them
 * to the map's overlay system.
 */
public class MapViewGestureDetectorListener extends SimpleOnGestureListener {

    private final MapView mapView;

    /**
     * Bind a new gesture detector to a map
     *
     * @param mv a map view
     */
    public MapViewGestureDetectorListener(final MapView mv) {
        this.mapView = mv;
    }

    @Override
    public boolean onDown(final MotionEvent e) {

        // Stop scrolling if we are in the middle of a fling!
        if (this.mapView.mIsFlinging) {
            this.mapView.mScroller.abortAnimation();
            this.mapView.mIsFlinging = false;
        }

        if (this.mapView.getOverlayManager().onDown(e, this.mapView)) {
            return true;
        }

        return true;
    }

    @Override
    public boolean onFling(final MotionEvent e1, final MotionEvent e2, final float velocityX, final float velocityY) {
        if (this.mapView.isAnimating() || this.mapView.getOverlayManager().onFling(e1, e2, velocityX, velocityY, this.mapView)) {
            return true;
        }

        final int worldSize = this.mapView.getProjection().mapSize(this.mapView.getZoomLevel(false));
        this.mapView.mIsFlinging = true;
        this.mapView.mScroller.fling(this.mapView.getScrollX(), this.mapView.getScrollY(),
                (int) -velocityX, (int) -velocityY, -worldSize, worldSize, -worldSize, worldSize);
        return true;
    }

    @Override
    public void onLongPress(final MotionEvent e) {
        if (this.mapView.getOverlayManager().onLongPress(e, this.mapView)) {
            return;
        }
        if (UtilConstants.DEBUGMODE) {
            final ILatLng center = this.mapView.getProjection().fromPixels(e.getX(), e.getY());
            this.mapView.zoomOutFixing(center, false);
        }
    }

    @Override
    public boolean onScroll(final MotionEvent e1, final MotionEvent e2, final float distanceX,
            final float distanceY) {
        if (this.mapView.isAnimating() || this.mapView.getOverlayManager()
                .onScroll(e1, e2, distanceX, distanceY, this.mapView)) {
            return true;
        }
        this.mapView.getController().panBy((int) distanceX, (int) distanceY, true);
        return true;
    }

    @Override
    public void onShowPress(final MotionEvent e) {
        this.mapView.getOverlayManager().onShowPress(e, this.mapView);
    }

    @Override
    public boolean onSingleTapUp(final MotionEvent e) {
        return false;
    }

    @Override
    public boolean onSingleTapConfirmed(final MotionEvent e) {
        return this.mapView.getOverlayManager().onSingleTapConfirmed(e, this.mapView);
    }

    @Override
    public boolean onDoubleTap(final MotionEvent e) {
        if (this.mapView.getOverlayManager().onDoubleTap(e, this.mapView)) {
            return true;
        }
        final ILatLng center = this.mapView.getProjection().fromPixels(e.getX(), e.getY());
        return this.mapView.zoomInFixing(center, false);
    }
}