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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.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 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 Transition#createAnimator(ViewGroup, TransitionValues, TransitionValues)}
     41  * method.</p>
     42  */
     43 public class TransitionValues {
     44 
     45     /**
     46      * The View with these values
     47      */
     48     public View view;
     49 
     50     /**
     51      * The set of values tracked by transitions for this scene
     52      */
     53     public final Map<String, Object> values = new ArrayMap<String, Object>();
     54 
     55     @Override
     56     public boolean equals(Object other) {
     57         if (other instanceof TransitionValues) {
     58             if (view == ((TransitionValues) other).view) {
     59                 if (values.equals(((TransitionValues) other).values)) {
     60                     return true;
     61                 }
     62             }
     63         }
     64         return false;
     65     }
     66 
     67     @Override
     68     public int hashCode() {
     69         return 31*view.hashCode() + values.hashCode();
     70     }
     71 
     72     @Override
     73     public String toString() {
     74         String returnValue = "TransitionValues@" + Integer.toHexString(hashCode()) + ":\n";
     75         returnValue += "    view = " + view + "\n";
     76         returnValue += "    values:";
     77         for (String s : values.keySet()) {
     78             returnValue += "    " + s + ": " + values.get(s) + "\n";
     79         }
     80         return returnValue;
     81     }
     82 }