1 /* 2 * Copyright (C) 2013 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 */ 16 17 package android.transition; 18 19 import android.animation.Animator; 20 import android.animation.ObjectAnimator; 21 import android.annotation.NonNull; 22 import android.annotation.Nullable; 23 import android.view.View; 24 import android.view.ViewGroup; 25 26 /** 27 * This transition captures the rotation property of targets before and after 28 * the scene change and animates any changes. 29 * 30 * @hide 31 */ 32 public class Rotate extends Transition { 33 34 private static final String PROPNAME_ROTATION = "android:rotate:rotation"; 35 36 @Override captureStartValues(TransitionValues transitionValues)37 public void captureStartValues(TransitionValues transitionValues) { 38 transitionValues.values.put(PROPNAME_ROTATION, transitionValues.view.getRotation()); 39 } 40 41 @Override captureEndValues(TransitionValues transitionValues)42 public void captureEndValues(TransitionValues transitionValues) { 43 transitionValues.values.put(PROPNAME_ROTATION, transitionValues.view.getRotation()); 44 } 45 46 @Nullable 47 @Override createAnimator(@onNull ViewGroup sceneRoot, @Nullable TransitionValues startValues, @Nullable TransitionValues endValues)48 public Animator createAnimator(@NonNull ViewGroup sceneRoot, 49 @Nullable TransitionValues startValues, 50 @Nullable TransitionValues endValues) { 51 if (startValues == null || endValues == null) { 52 return null; 53 } 54 final View view = endValues.view; 55 float startRotation = (Float) startValues.values.get(PROPNAME_ROTATION); 56 float endRotation = (Float) endValues.values.get(PROPNAME_ROTATION); 57 if (startRotation != endRotation) { 58 view.setRotation(startRotation); 59 return ObjectAnimator.ofFloat(view, View.ROTATION, 60 startRotation, endRotation); 61 } 62 return null; 63 } 64 } 65