ui/views/RevealEffect/RevealEffectBasic/RevealEffectBasicSample/src/main/java/com/example/android/revealeffectbasic/RevealEffectBasicFragment.java

/*
 * Copyright 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.android.revealeffectbasic;

import android.animation.ValueAnimator;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AccelerateDecelerateInterpolator;

/**
 * This sample shows a view that is revealed when a button is clicked.
 */
public class RevealEffectBasicFragment extends Fragment {

    private final static String TAG = "RevealEffectBasicFragment";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }

    @Override
    public View onCreateView(
            LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        final View rootView = inflater.inflate(R.layout.reveal_effect_basic, container, false);

        View button = rootView.findViewById(R.id.button);

        /* Set a listener to reveal the view on ACTION_DOWN. */
        button.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                if (motionEvent.getActionMasked() == MotionEvent.ACTION_DOWN) {
                    View shape = rootView.findViewById(R.id.circle);
                    /* Create a reveal {@Link ValueAnimator} that starts clipping the view from
                    * the top left corner until the whole view is covered. */
                    ValueAnimator animator = shape.createRevealAnimator(
                            0,
                            0,
                            0,
                            (float) Math.hypot(shape.getWidth(), shape.getHeight()));

                    /* Set a natural ease-in/ease-out interpolator. */
                    animator.setInterpolator(new AccelerateDecelerateInterpolator());

                    animator.start();
                    return false;
                }
                return false;
            }
        });

        return rootView;
    }

}