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      1 /*
      2  * Copyright (C) 2013 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 android.transition;
     18 
     19 import android.util.ArrayMap;
     20 import android.view.View;
     21 import android.view.ViewGroup;
     22 
     23 import java.util.ArrayList;
     24 import java.util.Map;
     25 
     26 /**
     27  * Data structure which holds cached values for the transition.
     28  * The view field is the target which all of the values pertain to.
     29  * The values field is a map which holds information for fields
     30  * according to names selected by the transitions. These names should
     31  * be unique to avoid clobbering values stored by other transitions,
     32  * such as the convention project:transition_name:property_name. For
     33  * example, the platform might store a property "alpha" in a transition
     34  * "Fader" as "android:fader:alpha".
     35  *
     36  * <p>These values are cached during the
     37  * {@link Transition#captureStartValues(TransitionValues)}
     38  * capture} phases of a scene change, once when the start values are captured
     39  * and again when the end values are captured. These start/end values are then
     40  * passed into the transitions via the
     41  * for {@link Transition#createAnimator(ViewGroup, TransitionValues, TransitionValues)}
     42  * method.</p>
     43  */
     44 public class TransitionValues {
     45 
     46     /**
     47      * The View with these values
     48      */
     49     public View view;
     50 
     51     /**
     52      * The set of values tracked by transitions for this scene
     53      */
     54     public final Map<String, Object> values = new ArrayMap<String, Object>();
     55 
     56     /**
     57      * The Transitions that targeted this view.
     58      */
     59     final ArrayList<Transition> targetedTransitions = new ArrayList<Transition>();
     60 
     61     @Override
     62     public boolean equals(Object other) {
     63         if (other instanceof TransitionValues) {
     64             if (view == ((TransitionValues) other).view) {
     65                 if (values.equals(((TransitionValues) other).values)) {
     66                     return true;
     67                 }
     68             }
     69         }
     70         return false;
     71     }
     72 
     73     @Override
     74     public int hashCode() {
     75         return 31*view.hashCode() + values.hashCode();
     76     }
     77 
     78     @Override
     79     public String toString() {
     80         String returnValue = "TransitionValues@" + Integer.toHexString(hashCode()) + ":\n";
     81         returnValue += "    view = " + view + "\n";
     82         returnValue += "    values:";
     83         for (String s : values.keySet()) {
     84             returnValue += "    " + s + ": " + values.get(s) + "\n";
     85         }
     86         return returnValue;
     87     }
     88 }