linphone-android/src/android/org/linphone/compatibility/CompatibilityScaleGestureDetector.java

package org.linphone.compatibility;

/*
CompatibilityScaleGestureDetector.java
Copyright (C) 2017  Belledonne Communications, Grenoble, France

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

import android.annotation.TargetApi;
import android.content.Context;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;

@TargetApi(8)
public class CompatibilityScaleGestureDetector extends ScaleGestureDetector.SimpleOnScaleGestureListener {
	private ScaleGestureDetector detector;
	private CompatibilityScaleGestureListener listener;

	public CompatibilityScaleGestureDetector(Context context) {
		detector = new ScaleGestureDetector(context, this);
	}

	public void setOnScaleListener(CompatibilityScaleGestureListener newListener) {
		listener = newListener;
	}

	public boolean onTouchEvent(MotionEvent event) {
		return detector.onTouchEvent(event);
	}

	@Override
    public boolean onScale(ScaleGestureDetector detector) {
		if (listener == null) {
			return false;
		}

		return listener.onScale(this);
    }

	public float getScaleFactor() {
		return detector.getScaleFactor();
	}

	public void destroy() {
		listener = null;
		detector = null;
	}
}