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      1 /*
      2  * Copyright (C) 2012 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 
     24 /**
     25  * Information the state of a window.
     26  *
     27  * @hide
     28  */
     29 public class WindowInfo implements Parcelable {
     30 
     31     private static final int MAX_POOL_SIZE = 20;
     32 
     33     private static int UNDEFINED = -1;
     34 
     35     private static Object sPoolLock = new Object();
     36     private static WindowInfo sPool;
     37     private static int sPoolSize;
     38 
     39     private WindowInfo mNext;
     40     private boolean mInPool;
     41 
     42     public IBinder token;
     43 
     44     public final Rect frame = new Rect();
     45 
     46     public final Rect touchableRegion = new Rect();
     47 
     48     public int type = UNDEFINED;
     49 
     50     public float compatibilityScale = UNDEFINED;
     51 
     52     public boolean visible;
     53 
     54     public int displayId = UNDEFINED;
     55 
     56     public int layer = UNDEFINED;
     57 
     58     private WindowInfo() {
     59         /* do nothing - reduce visibility */
     60     }
     61 
     62     @Override
     63     public int describeContents() {
     64         return 0;
     65     }
     66 
     67     @Override
     68     public void writeToParcel(Parcel parcel, int flags) {
     69         parcel.writeStrongBinder(token);
     70         parcel.writeParcelable(frame, 0);
     71         parcel.writeParcelable(touchableRegion, 0);
     72         parcel.writeInt(type);
     73         parcel.writeFloat(compatibilityScale);
     74         parcel.writeInt(visible ? 1 : 0);
     75         parcel.writeInt(displayId);
     76         parcel.writeInt(layer);
     77         recycle();
     78     }
     79 
     80     private void initFromParcel(Parcel parcel) {
     81         token = parcel.readStrongBinder();
     82         frame.set((Rect) parcel.readParcelable(null));
     83         touchableRegion.set((Rect) parcel.readParcelable(null));
     84         type = parcel.readInt();
     85         compatibilityScale = parcel.readFloat();
     86         visible = (parcel.readInt() == 1);
     87         displayId = parcel.readInt();
     88         layer = parcel.readInt();
     89     }
     90 
     91     public static WindowInfo obtain(WindowInfo other) {
     92         WindowInfo info = obtain();
     93         info.token = other.token;
     94         info.frame.set(other.frame);
     95         info.touchableRegion.set(other.touchableRegion);
     96         info.type = other.type;
     97         info.compatibilityScale = other.compatibilityScale;
     98         info.visible = other.visible;
     99         info.displayId = other.displayId;
    100         info.layer = other.layer;
    101         return info;
    102     }
    103 
    104     public static WindowInfo obtain() {
    105         synchronized (sPoolLock) {
    106             if (sPoolSize > 0) {
    107                 WindowInfo info = sPool;
    108                 sPool = info.mNext;
    109                 info.mNext = null;
    110                 info.mInPool = false;
    111                 sPoolSize--;
    112                 return info;
    113             } else {
    114                 return new WindowInfo();
    115             }
    116         }
    117     }
    118 
    119     public void recycle() {
    120         if (mInPool) {
    121             throw new IllegalStateException("Already recycled.");
    122         }
    123         clear();
    124         synchronized (sPoolLock) {
    125             if (sPoolSize < MAX_POOL_SIZE) {
    126                 mNext = sPool;
    127                 sPool = this;
    128                 mInPool = true;
    129                 sPoolSize++;
    130             }
    131         }
    132     }
    133 
    134     private void clear() {
    135         token = null;
    136         frame.setEmpty();
    137         touchableRegion.setEmpty();
    138         type = UNDEFINED;
    139         compatibilityScale = UNDEFINED;
    140         visible = false;
    141         displayId = UNDEFINED;
    142         layer = UNDEFINED;
    143     }
    144 
    145     @Override
    146     public String toString() {
    147         StringBuilder builder = new StringBuilder();
    148         builder.append("Window [token:").append((token != null) ? token.hashCode() : null);
    149         builder.append(", displayId:").append(displayId);
    150         builder.append(", type:").append(type);
    151         builder.append(", visible:").append(visible);
    152         builder.append(", layer:").append(layer);
    153         builder.append(", compatibilityScale:").append(compatibilityScale);
    154         builder.append(", frame:").append(frame);
    155         builder.append(", touchableRegion:").append(touchableRegion);
    156         builder.append("]");
    157         return builder.toString();
    158     }
    159 
    160     /**
    161      * @see Parcelable.Creator
    162      */
    163     public static final Parcelable.Creator<WindowInfo> CREATOR =
    164             new Parcelable.Creator<WindowInfo>() {
    165         public WindowInfo createFromParcel(Parcel parcel) {
    166             WindowInfo info = WindowInfo.obtain();
    167             info.initFromParcel(parcel);
    168             return info;
    169         }
    170 
    171         public WindowInfo[] newArray(int size) {
    172             return new WindowInfo[size];
    173         }
    174     };
    175 }
    176