1 /* 2 * Copyright (C) 2018 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 com.android.launcher3.util; 18 19 import static com.android.launcher3.LauncherAnimUtils.VIEW_ALPHA; 20 21 import android.view.View; 22 23 import com.android.launcher3.anim.AlphaUpdateListener; 24 25 /** 26 * Utility class to handle separating a single value as a factor of multiple values 27 */ 28 public class MultiValueAlpha extends MultiPropertyFactory<View> { 29 30 private static final FloatBiFunction ALPHA_AGGREGATOR = (a, b) -> a * b; 31 32 // Whether we should change from INVISIBLE to VISIBLE and vice versa at low alpha values. 33 private boolean mUpdateVisibility; 34 MultiValueAlpha(View view, int size)35 public MultiValueAlpha(View view, int size) { 36 super(view, VIEW_ALPHA, size, ALPHA_AGGREGATOR, 1f); 37 } 38 39 /** Sets whether we should update between INVISIBLE and VISIBLE based on alpha. */ setUpdateVisibility(boolean updateVisibility)40 public void setUpdateVisibility(boolean updateVisibility) { 41 mUpdateVisibility = updateVisibility; 42 } 43 44 @Override apply(float value)45 protected void apply(float value) { 46 super.apply(value); 47 if (mUpdateVisibility) { 48 AlphaUpdateListener.updateVisibility(mTarget); 49 } 50 } 51 } 52