1 /* 2 * Copyright (C) 2016 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.anim; 18 19 import android.animation.TimeInterpolator; 20 import android.util.FloatProperty; 21 import android.util.IntProperty; 22 import android.view.View; 23 24 /** 25 * Utility class for setting a property with or without animation 26 */ 27 public interface PropertySetter { 28 29 PropertySetter NO_ANIM_PROPERTY_SETTER = new PropertySetter() { }; 30 31 /** 32 * Sets the view alpha using the provided interpolator. 33 * Unlike {@link #setFloat}, this also updates the visibility of the view as alpha changes 34 * between zero and non-zero. 35 */ setViewAlpha(View view, float alpha, TimeInterpolator interpolator)36 default void setViewAlpha(View view, float alpha, TimeInterpolator interpolator) { 37 if (view != null) { 38 view.setAlpha(alpha); 39 AlphaUpdateListener.updateVisibility(view); 40 } 41 } 42 43 /** 44 * Updates the float property of the target using the provided interpolator 45 */ setFloat(T target, FloatProperty<T> property, float value, TimeInterpolator interpolator)46 default <T> void setFloat(T target, FloatProperty<T> property, float value, 47 TimeInterpolator interpolator) { 48 property.setValue(target, value); 49 } 50 51 /** 52 * Updates the int property of the target using the provided interpolator 53 */ setInt(T target, IntProperty<T> property, int value, TimeInterpolator interpolator)54 default <T> void setInt(T target, IntProperty<T> property, int value, 55 TimeInterpolator interpolator) { 56 property.setValue(target, value); 57 } 58 } 59