1 /* 2 * Copyright (C) 2016 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.support.design.internal; 18 19 import android.animation.Animator; 20 import android.animation.ValueAnimator; 21 import android.support.annotation.RequiresApi; 22 import android.support.annotation.RestrictTo; 23 import android.support.transition.Transition; 24 import android.support.transition.TransitionValues; 25 import android.view.ViewGroup; 26 import android.widget.TextView; 27 28 import java.util.Map; 29 30 /** 31 * @hide 32 */ 33 @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP) 34 @RequiresApi(14) 35 public class TextScale extends Transition { 36 private static final String PROPNAME_SCALE = "android:textscale:scale"; 37 38 @Override captureStartValues(TransitionValues transitionValues)39 public void captureStartValues(TransitionValues transitionValues) { 40 captureValues(transitionValues); 41 } 42 43 @Override captureEndValues(TransitionValues transitionValues)44 public void captureEndValues(TransitionValues transitionValues) { 45 captureValues(transitionValues); 46 } 47 captureValues(TransitionValues transitionValues)48 private void captureValues(TransitionValues transitionValues) { 49 if (transitionValues.view instanceof TextView) { 50 TextView textview = (TextView) transitionValues.view; 51 transitionValues.values.put(PROPNAME_SCALE, textview.getScaleX()); 52 } 53 } 54 55 @Override createAnimator(ViewGroup sceneRoot, TransitionValues startValues, TransitionValues endValues)56 public Animator createAnimator(ViewGroup sceneRoot, TransitionValues startValues, 57 TransitionValues endValues) { 58 if (startValues == null || endValues == null || !(startValues.view instanceof TextView) 59 || !(endValues.view instanceof TextView)) { 60 return null; 61 } 62 final TextView view = (TextView) endValues.view; 63 Map<String, Object> startVals = startValues.values; 64 Map<String, Object> endVals = endValues.values; 65 final float startSize = startVals.get(PROPNAME_SCALE) != null ? (float) startVals.get( 66 PROPNAME_SCALE) : 1f; 67 final float endSize = endVals.get(PROPNAME_SCALE) != null ? (float) endVals.get( 68 PROPNAME_SCALE) : 1f; 69 if (startSize == endSize) { 70 return null; 71 } 72 73 ValueAnimator animator = ValueAnimator.ofFloat(startSize, endSize); 74 75 animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 76 @Override 77 public void onAnimationUpdate(ValueAnimator valueAnimator) { 78 float animatedValue = (float) valueAnimator.getAnimatedValue(); 79 view.setScaleX(animatedValue); 80 view.setScaleY(animatedValue); 81 } 82 }); 83 return animator; 84 } 85 } 86