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      1 /*
      2  * Copyright (C) 2014 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.view;
     18 
     19 import android.graphics.Rect;
     20 import android.os.IBinder;
     21 import android.os.Parcel;
     22 import android.os.Parcelable;
     23 import android.util.Pools;
     24 
     25 import java.util.ArrayList;
     26 import java.util.List;
     27 
     28 /**
     29  * This class represents information about a window from the
     30  * window manager to another part of the system.
     31  *
     32  * @hide
     33  */
     34 public class WindowInfo implements Parcelable {
     35     private static final int MAX_POOL_SIZE = 10;
     36 
     37     private static final Pools.SynchronizedPool<WindowInfo> sPool =
     38             new Pools.SynchronizedPool<WindowInfo>(MAX_POOL_SIZE);
     39 
     40     public int type;
     41     public int layer;
     42     public IBinder token;
     43     public IBinder parentToken;
     44     public boolean focused;
     45     public final Rect boundsInScreen = new Rect();
     46     public List<IBinder> childTokens;
     47 
     48     private WindowInfo() {
     49         /* do nothing - hide constructor */
     50     }
     51 
     52     public static WindowInfo obtain() {
     53         WindowInfo window = sPool.acquire();
     54         if (window == null) {
     55             window = new WindowInfo();
     56         }
     57         return window;
     58     }
     59 
     60     public static WindowInfo obtain(WindowInfo other) {
     61         WindowInfo window = obtain();
     62         window.type = other.type;
     63         window.layer = other.layer;
     64         window.token = other.token;
     65         window.parentToken = other.parentToken;
     66         window.focused = other.focused;
     67         window.boundsInScreen.set(other.boundsInScreen);
     68 
     69         if (other.childTokens != null && !other.childTokens.isEmpty()) {
     70             if (window.childTokens == null) {
     71                 window.childTokens = new ArrayList<IBinder>(other.childTokens);
     72             } else {
     73                 window.childTokens.addAll(other.childTokens);
     74             }
     75         }
     76 
     77         return window;
     78     }
     79 
     80     public void recycle() {
     81         clear();
     82         sPool.release(this);
     83     }
     84 
     85     @Override
     86     public int describeContents() {
     87         return 0;
     88     }
     89 
     90     @Override
     91     public void writeToParcel(Parcel parcel, int flags) {
     92         parcel.writeInt(type);
     93         parcel.writeInt(layer);
     94         parcel.writeStrongBinder(token);
     95         parcel.writeStrongBinder(parentToken);
     96         parcel.writeInt(focused ? 1 : 0);
     97         boundsInScreen.writeToParcel(parcel, flags);
     98 
     99         if (childTokens != null && !childTokens.isEmpty()) {
    100             parcel.writeInt(1);
    101             parcel.writeBinderList(childTokens);
    102         } else {
    103             parcel.writeInt(0);
    104         }
    105     }
    106 
    107     @Override
    108     public String toString() {
    109         StringBuilder builder = new StringBuilder();
    110         builder.append("WindowInfo[");
    111         builder.append("type=").append(type);
    112         builder.append(", layer=").append(layer);
    113         builder.append(", token=").append(token);
    114         builder.append(", bounds=").append(boundsInScreen);
    115         builder.append(", parent=").append(parentToken);
    116         builder.append(", focused=").append(focused);
    117         builder.append(", children=").append(childTokens);
    118         builder.append(']');
    119         return builder.toString();
    120     }
    121 
    122     private void initFromParcel(Parcel parcel) {
    123         type = parcel.readInt();
    124         layer = parcel.readInt();
    125         token = parcel.readStrongBinder();
    126         parentToken = parcel.readStrongBinder();
    127         focused = (parcel.readInt() == 1);
    128         boundsInScreen.readFromParcel(parcel);
    129 
    130         final boolean hasChildren = (parcel.readInt() == 1);
    131         if (hasChildren) {
    132             if (childTokens == null) {
    133                 childTokens = new ArrayList<IBinder>();
    134             }
    135             parcel.readBinderList(childTokens);
    136         }
    137     }
    138 
    139     private void clear() {
    140         type = 0;
    141         layer = 0;
    142         token = null;
    143         parentToken = null;
    144         focused = false;
    145         boundsInScreen.setEmpty();
    146         if (childTokens != null) {
    147             childTokens.clear();
    148         }
    149     }
    150 
    151     public static final Parcelable.Creator<WindowInfo> CREATOR =
    152             new Creator<WindowInfo>() {
    153         @Override
    154         public WindowInfo createFromParcel(Parcel parcel) {
    155             WindowInfo window = obtain();
    156             window.initFromParcel(parcel);
    157             return window;
    158         }
    159 
    160         @Override
    161         public WindowInfo[] newArray(int size) {
    162             return new WindowInfo[size];
    163         }
    164     };
    165 }
    166