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 package com.android.launcher3.folder; 17 18 import android.animation.Animator; 19 import android.animation.AnimatorListenerAdapter; 20 import android.animation.ValueAnimator; 21 22 import com.android.launcher3.LauncherAnimUtils; 23 24 /** 25 * Animates a Folder preview item. 26 */ 27 class FolderPreviewItemAnim { 28 29 private static PreviewItemDrawingParams sTmpParams = new PreviewItemDrawingParams(0, 0, 0, 0); 30 31 private ValueAnimator mValueAnimator; 32 33 float finalScale; 34 float finalTransX; 35 float finalTransY; 36 37 /** 38 * @param params layout params to animate 39 * @param index0 original index of the item to be animated 40 * @param items0 original number of items in the preview 41 * @param index1 new index of the item to be animated 42 * @param items1 new number of items in the preview 43 * @param duration duration in ms of the animation 44 * @param onCompleteRunnable runnable to execute upon animation completion 45 */ FolderPreviewItemAnim(final PreviewItemManager previewItemManager, final PreviewItemDrawingParams params, int index0, int items0, int index1, int items1, int duration, final Runnable onCompleteRunnable)46 FolderPreviewItemAnim(final PreviewItemManager previewItemManager, 47 final PreviewItemDrawingParams params, int index0, int items0, int index1, int items1, 48 int duration, final Runnable onCompleteRunnable) { 49 previewItemManager.computePreviewItemDrawingParams(index1, items1, sTmpParams); 50 51 finalScale = sTmpParams.scale; 52 finalTransX = sTmpParams.transX; 53 finalTransY = sTmpParams.transY; 54 55 previewItemManager.computePreviewItemDrawingParams(index0, items0, sTmpParams); 56 57 final float scale0 = sTmpParams.scale; 58 final float transX0 = sTmpParams.transX; 59 final float transY0 = sTmpParams.transY; 60 61 mValueAnimator = LauncherAnimUtils.ofFloat(0f, 1.0f); 62 mValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener(){ 63 public void onAnimationUpdate(ValueAnimator animation) { 64 float progress = animation.getAnimatedFraction(); 65 66 params.transX = transX0 + progress * (finalTransX - transX0); 67 params.transY = transY0 + progress * (finalTransY - transY0); 68 params.scale = scale0 + progress * (finalScale - scale0); 69 previewItemManager.onParamsChanged(); 70 } 71 }); 72 mValueAnimator.addListener(new AnimatorListenerAdapter() { 73 @Override 74 public void onAnimationEnd(Animator animation) { 75 if (onCompleteRunnable != null) { 76 onCompleteRunnable.run(); 77 } 78 params.anim = null; 79 } 80 }); 81 mValueAnimator.setDuration(duration); 82 } 83 start()84 public void start() { 85 mValueAnimator.start(); 86 } 87 cancel()88 public void cancel() { 89 mValueAnimator.cancel(); 90 } 91 hasEqualFinalState(FolderPreviewItemAnim anim)92 public boolean hasEqualFinalState(FolderPreviewItemAnim anim) { 93 return finalTransY == anim.finalTransY && finalTransX == anim.finalTransX && 94 finalScale == anim.finalScale; 95 96 } 97 } 98