1/* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16package android.support.v17.leanback.transition; 17 18import android.animation.Animator; 19import android.animation.ValueAnimator; 20import android.view.View; 21import android.view.ViewGroup; 22import android.transition.Transition; 23import android.transition.TransitionValues; 24 25/** 26 * @hide 27 */ 28class Scale extends Transition { 29 private static final String PROPNAME_SCALE = "android:leanback:scale"; 30 31 public Scale() { 32 } 33 34 private void captureValues(TransitionValues values) { 35 View view = values.view; 36 values.values.put(PROPNAME_SCALE, view.getScaleX()); 37 } 38 39 @Override 40 public void captureStartValues(TransitionValues transitionValues) { 41 captureValues(transitionValues); 42 } 43 44 @Override 45 public void captureEndValues(TransitionValues transitionValues) { 46 captureValues(transitionValues); 47 } 48 49 @Override 50 public Animator createAnimator(final ViewGroup sceneRoot, TransitionValues startValues, 51 TransitionValues endValues) { 52 if (startValues == null || endValues == null) { 53 return null; 54 } 55 56 final float startScale = (Float) startValues.values.get(PROPNAME_SCALE); 57 final float endScale = (Float) endValues.values.get(PROPNAME_SCALE); 58 59 final View view = startValues.view; 60 view.setScaleX(startScale); 61 view.setScaleY(startScale); 62 63 ValueAnimator animator = ValueAnimator.ofFloat(startScale, endScale); 64 animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 65 @Override 66 public void onAnimationUpdate(ValueAnimator animation) { 67 final float scale = (Float) animation.getAnimatedValue(); 68 view.setScaleX(scale); 69 view.setScaleY(scale); 70 } 71 }); 72 return animator; 73 } 74} 75