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 */ 16 package android.transition; 17 18 import android.animation.Animator; 19 import android.animation.ObjectAnimator; 20 import android.animation.RectEvaluator; 21 import android.content.Context; 22 import android.graphics.Rect; 23 import android.util.AttributeSet; 24 import android.view.View; 25 import android.view.ViewGroup; 26 27 /** 28 * ChangeClipBounds captures the {@link android.view.View#getClipBounds()} before and after the 29 * scene change and animates those changes during the transition. 30 */ 31 public class ChangeClipBounds extends Transition { 32 33 private static final String TAG = "ChangeTransform"; 34 35 private static final String PROPNAME_CLIP = "android:clipBounds:clip"; 36 private static final String PROPNAME_BOUNDS = "android:clipBounds:bounds"; 37 38 private static final String[] sTransitionProperties = { 39 PROPNAME_CLIP, 40 }; 41 ChangeClipBounds()42 public ChangeClipBounds() {} 43 ChangeClipBounds(Context context, AttributeSet attrs)44 public ChangeClipBounds(Context context, AttributeSet attrs) { 45 super(context, attrs); 46 } 47 48 @Override getTransitionProperties()49 public String[] getTransitionProperties() { 50 return sTransitionProperties; 51 } 52 captureValues(TransitionValues values)53 private void captureValues(TransitionValues values) { 54 View view = values.view; 55 if (view.getVisibility() == View.GONE) { 56 return; 57 } 58 59 Rect clip = view.getClipBounds(); 60 values.values.put(PROPNAME_CLIP, clip); 61 if (clip == null) { 62 Rect bounds = new Rect(0, 0, view.getWidth(), view.getHeight()); 63 values.values.put(PROPNAME_BOUNDS, bounds); 64 } 65 } 66 67 @Override captureStartValues(TransitionValues transitionValues)68 public void captureStartValues(TransitionValues transitionValues) { 69 captureValues(transitionValues); 70 } 71 72 @Override captureEndValues(TransitionValues transitionValues)73 public void captureEndValues(TransitionValues transitionValues) { 74 captureValues(transitionValues); 75 } 76 77 @Override createAnimator(final ViewGroup sceneRoot, TransitionValues startValues, TransitionValues endValues)78 public Animator createAnimator(final ViewGroup sceneRoot, TransitionValues startValues, 79 TransitionValues endValues) { 80 if (startValues == null || endValues == null 81 || !startValues.values.containsKey(PROPNAME_CLIP) 82 || !endValues.values.containsKey(PROPNAME_CLIP)) { 83 return null; 84 } 85 Rect start = (Rect) startValues.values.get(PROPNAME_CLIP); 86 Rect end = (Rect) endValues.values.get(PROPNAME_CLIP); 87 if (start == null && end == null) { 88 return null; // No animation required since there is no clip. 89 } 90 91 if (start == null) { 92 start = (Rect) startValues.values.get(PROPNAME_BOUNDS); 93 } else if (end == null) { 94 end = (Rect) endValues.values.get(PROPNAME_BOUNDS); 95 } 96 if (start.equals(end)) { 97 return null; 98 } 99 100 endValues.view.setClipBounds(start); 101 RectEvaluator evaluator = new RectEvaluator(new Rect()); 102 return ObjectAnimator.ofObject(endValues.view, "clipBounds", evaluator, start, end); 103 } 104 } 105