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      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      */
     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 
     84     public void start() {
     85         mValueAnimator.start();
     86     }
     87 
     88     public void cancel() {
     89         mValueAnimator.cancel();
     90     }
     91 
     92     public boolean hasEqualFinalState(FolderPreviewItemAnim anim) {
     93         return finalTransY == anim.finalTransY && finalTransX == anim.finalTransX &&
     94                 finalScale == anim.finalScale;
     95 
     96     }
     97 }
     98