DefaultCardStreamAnimator.java

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/*
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* Copyright 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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*     http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.batchstepsensor.cardstream;
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import android.animation.ObjectAnimator;
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import android.animation.PropertyValuesHolder;
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import android.annotation.TargetApi;
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import android.content.Context;
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import android.graphics.Point;
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import android.os.Build;
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import android.view.View;
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import android.view.WindowManager;
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import android.view.animation.BounceInterpolator;
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class DefaultCardStreamAnimator extends CardStreamAnimator {
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    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
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    @Override
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    public ObjectAnimator getDisappearingAnimator(Context context){
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        ObjectAnimator animator = ObjectAnimator.ofPropertyValuesHolder(new Object(),
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                PropertyValuesHolder.ofFloat("alpha", 1.f, 0.f),
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                PropertyValuesHolder.ofFloat("scaleX", 1.f, 0.f),
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                PropertyValuesHolder.ofFloat("scaleY", 1.f, 0.f),
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                PropertyValuesHolder.ofFloat("rotation", 0.f, 270.f));
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        animator.setDuration((long) (200 * mSpeedFactor));
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        return animator;
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    }
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    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
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    @Override
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    public ObjectAnimator getAppearingAnimator(Context context){
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        final Point outPoint = new Point();
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        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
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        wm.getDefaultDisplay().getSize(outPoint);
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        ObjectAnimator animator = ObjectAnimator.ofPropertyValuesHolder(new Object(),
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                PropertyValuesHolder.ofFloat("alpha", 0.f, 1.f),
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                PropertyValuesHolder.ofFloat("translationY", outPoint.y / 2.f, 0.f),
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                PropertyValuesHolder.ofFloat("rotation", -45.f, 0.f));
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        animator.setDuration((long) (200 * mSpeedFactor));
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        return animator;
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    }
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    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
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    @Override
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    public ObjectAnimator getInitalAnimator(Context context){
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        ObjectAnimator animator = ObjectAnimator.ofPropertyValuesHolder(new Object(),
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                PropertyValuesHolder.ofFloat("alpha", 0.5f, 1.f),
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                PropertyValuesHolder.ofFloat("rotation", 60.f, 0.f));
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        animator.setDuration((long) (200 * mSpeedFactor));
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        return animator;
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    }
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    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
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    @Override
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    public ObjectAnimator getSwipeInAnimator(View view, float deltaX, float deltaY){
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        float deltaXAbs = Math.abs(deltaX);
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        float fractionCovered = 1.f - (deltaXAbs / view.getWidth());
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        long duration = Math.abs((int) ((1 - fractionCovered) * 200 * mSpeedFactor));
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        // Animate position and alpha of swiped item
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        ObjectAnimator animator = ObjectAnimator.ofPropertyValuesHolder(view,
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                PropertyValuesHolder.ofFloat("alpha", 1.f),
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                PropertyValuesHolder.ofFloat("translationX", 0.f),
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                PropertyValuesHolder.ofFloat("rotationY", 0.f));
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        animator.setDuration(duration).setInterpolator(new BounceInterpolator());
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        return  animator;
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    }
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    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
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    @Override
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    public ObjectAnimator getSwipeOutAnimator(View view, float deltaX, float deltaY){
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        float endX;
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        float endRotationY;
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        float deltaXAbs = Math.abs(deltaX);
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        float fractionCovered = 1.f - (deltaXAbs / view.getWidth());
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        long duration = Math.abs((int) ((1 - fractionCovered) * 200 * mSpeedFactor));
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        endX = deltaX < 0 ? -view.getWidth() : view.getWidth();
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        if (deltaX > 0)
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            endRotationY = -15.f;
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        else
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            endRotationY = 15.f;
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        // Animate position and alpha of swiped item
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        return ObjectAnimator.ofPropertyValuesHolder(view,
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                PropertyValuesHolder.ofFloat("alpha", 0.f),
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                PropertyValuesHolder.ofFloat("translationX", endX),
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                PropertyValuesHolder.ofFloat("rotationY", endRotationY)).setDuration(duration);
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    }
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}