ZoomFragment.java

/*
 *  Copyright (c) 2013, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 *
 */

package com.marshalchen.common.demoofui.rebound;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;

import com.marshalchen.common.uimodule.rebound.*;
import com.marshalchen.common.demoofui.R;

public class ZoomFragment extends Fragment {

    private final BaseSpringSystem mSpringSystem = SpringSystem.create();
    private final ExampleSpringListener mSpringListener = new ExampleSpringListener();
    private FrameLayout mRootView;
    private Spring mScaleSpring;
    private View mImageView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mScaleSpring = mSpringSystem.createSpring();

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        mRootView = (FrameLayout) inflater.inflate(R.layout.rebound_zoom_fragment, container, false);
        mImageView = mRootView.findViewById(R.id.image_view);
        mRootView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:
                        mScaleSpring.setEndValue(1);
                        break;
                    case MotionEvent.ACTION_UP:
                    case MotionEvent.ACTION_CANCEL:
                        mScaleSpring.setEndValue(0);
                        break;
                }
                return true;
            }
        });
        return mRootView;
    }

    @Override
    public void onResume() {
        super.onResume();
        mScaleSpring.addListener(mSpringListener);
    }

    @Override
    public void onPause() {
        super.onPause();
        mScaleSpring.removeListener(mSpringListener);
    }

    private class ExampleSpringListener extends SimpleSpringListener {
        @Override
        public void onSpringUpdate(Spring spring) {
            float mappedValue = (float) SpringUtil.mapValueFromRangeToRange(spring.getCurrentValue(), 0, 1, 1, 0.5);
            mImageView.setScaleX(mappedValue);
            mImageView.setScaleY(mappedValue);
        }
    }
}