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