RotationGestureOverlay.java

package com.arman.osmdroidmapsforge.map.overlays;

import android.content.Context;
import android.graphics.Canvas;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;

import com.arman.osmdroidmapsforge.map.utils.RotationGestureDetector;

import org.osmdroid.views.MapView;
import org.osmdroid.views.overlay.IOverlayMenuProvider;
import org.osmdroid.views.overlay.Overlay;


/**
 * Created by Arman on 2/20/2015.
 */
public class RotationGestureOverlay extends Overlay implements
        RotationGestureDetector.RotationListener, IOverlayMenuProvider
{
    private final static boolean SHOW_ROTATE_MENU_ITEMS = false;

    private final static int MENU_ENABLED = getSafeMenuId();
    private final static int MENU_ROTATE_CCW = getSafeMenuId();
    private final static int MENU_ROTATE_CW = getSafeMenuId();

    private final RotationGestureDetector mRotationDetector;
    private MapView mMapView;
    private boolean mOptionsMenuEnabled = true;

    public RotationGestureOverlay(Context context, MapView mapView)
    {
        super(context);
        mMapView = mapView;
        mRotationDetector = new RotationGestureDetector(this);
    }

    @Override
    protected void draw(Canvas c, MapView osmv, boolean shadow) {
        // No drawing necessary
    }

    @Override
    public boolean onTouchEvent(MotionEvent event, MapView mapView)
    {
        if (this.isEnabled()) {
            mRotationDetector.onTouch(event);
        }
        return super.onTouchEvent(event, mapView);
    }

    @Override
    public void onRotate(float deltaAngle)
    {
        mMapView.setMapOrientation(mMapView.getMapOrientation() + deltaAngle);
    }

    @Override
    public boolean isOptionsMenuEnabled()
    {
        return mOptionsMenuEnabled;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu pMenu, int pMenuIdOffset, MapView pMapView)
    {
        pMenu.add(0, MENU_ENABLED + pMenuIdOffset, Menu.NONE, "Enable rotation").setIcon(
                android.R.drawable.ic_menu_info_details);
        if (SHOW_ROTATE_MENU_ITEMS) {
            pMenu.add(0, MENU_ROTATE_CCW + pMenuIdOffset, Menu.NONE,
                    "Rotate maps counter clockwise").setIcon(android.R.drawable.ic_menu_rotate);
            pMenu.add(0, MENU_ROTATE_CW + pMenuIdOffset, Menu.NONE, "Rotate maps clockwise")
                    .setIcon(android.R.drawable.ic_menu_rotate);
        }
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem pItem, int pMenuIdOffset, MapView pMapView)
    {
        if (pItem.getItemId() == MENU_ENABLED + pMenuIdOffset) {
            if (this.isEnabled()) {
                mMapView.setMapOrientation(0);
                this.setEnabled(false);
            } else {
                this.setEnabled(true);
                return true;
            }
        } else if (pItem.getItemId() == MENU_ROTATE_CCW + pMenuIdOffset) {
            mMapView.setMapOrientation(mMapView.getMapOrientation() - 10);
        } else if (pItem.getItemId() == MENU_ROTATE_CW + pMenuIdOffset) {
            mMapView.setMapOrientation(mMapView.getMapOrientation() + 10);
        }

        return false;
    }

    @Override
    public boolean onPrepareOptionsMenu(final Menu pMenu, final int pMenuIdOffset, final MapView pMapView)
    {
        pMenu.findItem(MENU_ENABLED + pMenuIdOffset).setTitle(
                this.isEnabled() ? "Disable rotation" : "Enable rotation");
        return false;
    }

    @Override
    public void setOptionsMenuEnabled(boolean enabled)
    {
        mOptionsMenuEnabled = enabled;
    }
}