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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     public CharSequence title;
     48     public int accessibilityIdOfAnchor = View.NO_ID;
     49     public boolean inPictureInPicture;
     50 
     51     private WindowInfo() {
     52         /* do nothing - hide constructor */
     53     }
     54 
     55     public static WindowInfo obtain() {
     56         WindowInfo window = sPool.acquire();
     57         if (window == null) {
     58             window = new WindowInfo();
     59         }
     60         return window;
     61     }
     62 
     63     public static WindowInfo obtain(WindowInfo other) {
     64         WindowInfo window = obtain();
     65         window.type = other.type;
     66         window.layer = other.layer;
     67         window.token = other.token;
     68         window.parentToken = other.parentToken;
     69         window.focused = other.focused;
     70         window.boundsInScreen.set(other.boundsInScreen);
     71         window.title = other.title;
     72         window.accessibilityIdOfAnchor = other.accessibilityIdOfAnchor;
     73         window.inPictureInPicture = other.inPictureInPicture;
     74 
     75         if (other.childTokens != null && !other.childTokens.isEmpty()) {
     76             if (window.childTokens == null) {
     77                 window.childTokens = new ArrayList<IBinder>(other.childTokens);
     78             } else {
     79                 window.childTokens.addAll(other.childTokens);
     80             }
     81         }
     82 
     83         return window;
     84     }
     85 
     86     public void recycle() {
     87         clear();
     88         sPool.release(this);
     89     }
     90 
     91     @Override
     92     public int describeContents() {
     93         return 0;
     94     }
     95 
     96     @Override
     97     public void writeToParcel(Parcel parcel, int flags) {
     98         parcel.writeInt(type);
     99         parcel.writeInt(layer);
    100         parcel.writeStrongBinder(token);
    101         parcel.writeStrongBinder(parentToken);
    102         parcel.writeInt(focused ? 1 : 0);
    103         boundsInScreen.writeToParcel(parcel, flags);
    104         parcel.writeCharSequence(title);
    105         parcel.writeInt(accessibilityIdOfAnchor);
    106         parcel.writeInt(inPictureInPicture ? 1 : 0);
    107 
    108         if (childTokens != null && !childTokens.isEmpty()) {
    109             parcel.writeInt(1);
    110             parcel.writeBinderList(childTokens);
    111         } else {
    112             parcel.writeInt(0);
    113         }
    114     }
    115 
    116     @Override
    117     public String toString() {
    118         StringBuilder builder = new StringBuilder();
    119         builder.append("WindowInfo[");
    120         builder.append("title=").append(title);
    121         builder.append(", type=").append(type);
    122         builder.append(", layer=").append(layer);
    123         builder.append(", token=").append(token);
    124         builder.append(", bounds=").append(boundsInScreen);
    125         builder.append(", parent=").append(parentToken);
    126         builder.append(", focused=").append(focused);
    127         builder.append(", children=").append(childTokens);
    128         builder.append(", accessibility anchor=").append(accessibilityIdOfAnchor);
    129         builder.append(']');
    130         return builder.toString();
    131     }
    132 
    133     private void initFromParcel(Parcel parcel) {
    134         type = parcel.readInt();
    135         layer = parcel.readInt();
    136         token = parcel.readStrongBinder();
    137         parentToken = parcel.readStrongBinder();
    138         focused = (parcel.readInt() == 1);
    139         boundsInScreen.readFromParcel(parcel);
    140         title = parcel.readCharSequence();
    141         accessibilityIdOfAnchor = parcel.readInt();
    142         inPictureInPicture = (parcel.readInt() == 1);
    143 
    144         final boolean hasChildren = (parcel.readInt() == 1);
    145         if (hasChildren) {
    146             if (childTokens == null) {
    147                 childTokens = new ArrayList<IBinder>();
    148             }
    149             parcel.readBinderList(childTokens);
    150         }
    151     }
    152 
    153     private void clear() {
    154         type = 0;
    155         layer = 0;
    156         token = null;
    157         parentToken = null;
    158         focused = false;
    159         boundsInScreen.setEmpty();
    160         if (childTokens != null) {
    161             childTokens.clear();
    162         }
    163         inPictureInPicture = false;
    164     }
    165 
    166     public static final Parcelable.Creator<WindowInfo> CREATOR =
    167             new Creator<WindowInfo>() {
    168         @Override
    169         public WindowInfo createFromParcel(Parcel parcel) {
    170             WindowInfo window = obtain();
    171             window.initFromParcel(parcel);
    172             return window;
    173         }
    174 
    175         @Override
    176         public WindowInfo[] newArray(int size) {
    177             return new WindowInfo[size];
    178         }
    179     };
    180 }
    181