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 androidx.transition; 18 19 import android.view.View; 20 21 import java.util.ArrayList; 22 import java.util.HashMap; 23 import java.util.Map; 24 25 /** 26 * Data structure which holds cached values for the transition. 27 * The view field is the target which all of the values pertain to. 28 * The values field is a map which holds information for fields 29 * according to names selected by the transitions. These names should 30 * be unique to avoid clobbering values stored by other transitions, 31 * such as the convention project:transition_name:property_name. For 32 * example, the platform might store a property "alpha" in a transition 33 * "Fader" as "android:fader:alpha". 34 * 35 * <p>These values are cached during the 36 * {@link androidx.transition.Transition#captureStartValues(TransitionValues)} 37 * capture} phases of a scene change, once when the start values are captured 38 * and again when the end values are captured. These start/end values are then 39 * passed into the transitions via the 40 * for {@link androidx.transition.Transition#createAnimator(android.view.ViewGroup, 41 * TransitionValues, TransitionValues)} method.</p> 42 */ 43 public class TransitionValues { 44 45 /** 46 * The set of values tracked by transitions for this scene 47 */ 48 public final Map<String, Object> values = new HashMap<>(); 49 50 /** 51 * The View with these values 52 */ 53 public View view; 54 55 /** 56 * The Transitions that targeted this view. 57 */ 58 final ArrayList<Transition> mTargetedTransitions = new ArrayList<>(); 59 60 @Override equals(Object other)61 public boolean equals(Object other) { 62 if (other instanceof TransitionValues) { 63 if (view == ((TransitionValues) other).view) { 64 if (values.equals(((TransitionValues) other).values)) { 65 return true; 66 } 67 } 68 } 69 return false; 70 } 71 72 @Override hashCode()73 public int hashCode() { 74 return 31 * view.hashCode() + values.hashCode(); 75 } 76 77 @Override toString()78 public String toString() { 79 String returnValue = "TransitionValues@" + Integer.toHexString(hashCode()) + ":\n"; 80 returnValue += " view = " + view + "\n"; 81 returnValue += " values:"; 82 for (String s : values.keySet()) { 83 returnValue += " " + s + ": " + values.get(s) + "\n"; 84 } 85 return returnValue; 86 } 87 88 } 89