1/* 2 * Copyright (C) 2017 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 17package androidx.transition; 18 19import android.animation.Animator; 20import android.animation.AnimatorListenerAdapter; 21import android.graphics.Matrix; 22import android.os.Build; 23import android.util.Log; 24import android.widget.ImageView; 25 26import java.lang.reflect.InvocationTargetException; 27import java.lang.reflect.Method; 28 29class ImageViewUtils { 30 private static final String TAG = "ImageViewUtils"; 31 32 private static Method sAnimateTransformMethod; 33 private static boolean sAnimateTransformMethodFetched; 34 35 /** 36 * Starts animating the transformation of the image view. This has to be called before calling 37 * {@link #animateTransform(ImageView, Matrix)}. 38 */ 39 static void startAnimateTransform(ImageView view) { 40 if (Build.VERSION.SDK_INT < 21) { 41 final ImageView.ScaleType scaleType = view.getScaleType(); 42 view.setTag(R.id.save_scale_type, scaleType); 43 if (scaleType == ImageView.ScaleType.MATRIX) { 44 view.setTag(R.id.save_image_matrix, view.getImageMatrix()); 45 } else { 46 view.setScaleType(ImageView.ScaleType.MATRIX); 47 } 48 view.setImageMatrix(MatrixUtils.IDENTITY_MATRIX); 49 } 50 } 51 52 /** 53 * Sets the matrix to animate the content of the image view. 54 */ 55 static void animateTransform(ImageView view, Matrix matrix) { 56 if (Build.VERSION.SDK_INT < 21) { 57 view.setImageMatrix(matrix); 58 } else { 59 fetchAnimateTransformMethod(); 60 if (sAnimateTransformMethod != null) { 61 try { 62 sAnimateTransformMethod.invoke(view, matrix); 63 } catch (IllegalAccessException e) { 64 // Do nothing 65 } catch (InvocationTargetException e) { 66 throw new RuntimeException(e.getCause()); 67 } 68 } 69 } 70 } 71 72 private static void fetchAnimateTransformMethod() { 73 if (!sAnimateTransformMethodFetched) { 74 try { 75 sAnimateTransformMethod = ImageView.class.getDeclaredMethod("animateTransform", 76 Matrix.class); 77 sAnimateTransformMethod.setAccessible(true); 78 } catch (NoSuchMethodException e) { 79 Log.i(TAG, "Failed to retrieve animateTransform method", e); 80 } 81 sAnimateTransformMethodFetched = true; 82 } 83 } 84 85 /** 86 * Reserves that the caller will stop calling {@link #animateTransform(ImageView, Matrix)} when 87 * the specified animator ends. 88 */ 89 static void reserveEndAnimateTransform(final ImageView view, Animator animator) { 90 if (Build.VERSION.SDK_INT < 21) { 91 animator.addListener(new AnimatorListenerAdapter() { 92 @Override 93 public void onAnimationEnd(Animator animation) { 94 final ImageView.ScaleType scaleType = (ImageView.ScaleType) 95 view.getTag(R.id.save_scale_type); 96 view.setScaleType(scaleType); 97 view.setTag(R.id.save_scale_type, null); 98 if (scaleType == ImageView.ScaleType.MATRIX) { 99 view.setImageMatrix((Matrix) view.getTag(R.id.save_image_matrix)); 100 view.setTag(R.id.save_image_matrix, null); 101 } 102 animation.removeListener(this); 103 } 104 }); 105 } 106 } 107 108 private ImageViewUtils() { 109 } 110} 111