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      1 /*
      2  * Copyright (C) 2006 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.annotation.NonNull;
     20 import android.content.Context;
     21 import android.os.Bundle;
     22 import android.os.IBinder;
     23 import android.os.RemoteException;
     24 
     25 import com.android.internal.os.IResultReceiver;
     26 import com.android.internal.R;
     27 
     28 import java.util.List;
     29 
     30 /**
     31  * Provides low-level communication with the system window manager for
     32  * operations that are bound to a particular context, display or parent window.
     33  * Instances of this object are sensitive to the compatibility info associated
     34  * with the running application.
     35  *
     36  * This object implements the {@link ViewManager} interface,
     37  * allowing you to add any View subclass as a top-level window on the screen.
     38  * Additional window manager specific layout parameters are defined for
     39  * control over how windows are displayed.  It also implements the {@link WindowManager}
     40  * interface, allowing you to control the displays attached to the device.
     41  *
     42  * <p>Applications will not normally use WindowManager directly, instead relying
     43  * on the higher-level facilities in {@link android.app.Activity} and
     44  * {@link android.app.Dialog}.
     45  *
     46  * <p>Even for low-level window manager access, it is almost never correct to use
     47  * this class.  For example, {@link android.app.Activity#getWindowManager}
     48  * provides a window manager for adding windows that are associated with that
     49  * activity -- the window manager will not normally allow you to add arbitrary
     50  * windows that are not associated with an activity.
     51  *
     52  * @see WindowManager
     53  * @see WindowManagerGlobal
     54  * @hide
     55  */
     56 public final class WindowManagerImpl implements WindowManager {
     57     private final WindowManagerGlobal mGlobal = WindowManagerGlobal.getInstance();
     58     private final Context mContext;
     59     private final Window mParentWindow;
     60 
     61     private IBinder mDefaultToken;
     62 
     63     public WindowManagerImpl(Context context) {
     64         this(context, null);
     65     }
     66 
     67     private WindowManagerImpl(Context context, Window parentWindow) {
     68         mContext = context;
     69         mParentWindow = parentWindow;
     70     }
     71 
     72     public WindowManagerImpl createLocalWindowManager(Window parentWindow) {
     73         return new WindowManagerImpl(mContext, parentWindow);
     74     }
     75 
     76     public WindowManagerImpl createPresentationWindowManager(Context displayContext) {
     77         return new WindowManagerImpl(displayContext, mParentWindow);
     78     }
     79 
     80     /**
     81      * Sets the window token to assign when none is specified by the client or
     82      * available from the parent window.
     83      *
     84      * @param token The default token to assign.
     85      */
     86     public void setDefaultToken(IBinder token) {
     87         mDefaultToken = token;
     88     }
     89 
     90     @Override
     91     public void addView(@NonNull View view, @NonNull ViewGroup.LayoutParams params) {
     92         applyDefaultToken(params);
     93         mGlobal.addView(view, params, mContext.getDisplay(), mParentWindow);
     94     }
     95 
     96     @Override
     97     public void updateViewLayout(@NonNull View view, @NonNull ViewGroup.LayoutParams params) {
     98         applyDefaultToken(params);
     99         mGlobal.updateViewLayout(view, params);
    100     }
    101 
    102     private void applyDefaultToken(@NonNull ViewGroup.LayoutParams params) {
    103         // Only use the default token if we don't have a parent window.
    104         if (mDefaultToken != null && mParentWindow == null) {
    105             if (!(params instanceof WindowManager.LayoutParams)) {
    106                 throw new IllegalArgumentException("Params must be WindowManager.LayoutParams");
    107             }
    108 
    109             // Only use the default token if we don't already have a token.
    110             final WindowManager.LayoutParams wparams = (WindowManager.LayoutParams) params;
    111             if (wparams.token == null) {
    112                 wparams.token = mDefaultToken;
    113             }
    114         }
    115     }
    116 
    117     @Override
    118     public void removeView(View view) {
    119         mGlobal.removeView(view, false);
    120     }
    121 
    122     @Override
    123     public void removeViewImmediate(View view) {
    124         mGlobal.removeView(view, true);
    125     }
    126 
    127     @Override
    128     public void requestAppKeyboardShortcuts(
    129             final KeyboardShortcutsReceiver receiver, int deviceId) {
    130         IResultReceiver resultReceiver = new IResultReceiver.Stub() {
    131             @Override
    132             public void send(int resultCode, Bundle resultData) throws RemoteException {
    133                 List<KeyboardShortcutGroup> result =
    134                         resultData.getParcelableArrayList(PARCEL_KEY_SHORTCUTS_ARRAY);
    135                 receiver.onKeyboardShortcutsReceived(result);
    136             }
    137         };
    138         try {
    139             WindowManagerGlobal.getWindowManagerService()
    140                 .requestAppKeyboardShortcuts(resultReceiver, deviceId);
    141         } catch (RemoteException e) {
    142         }
    143     }
    144 
    145     @Override
    146     public Display getDefaultDisplay() {
    147         return mContext.getDisplay();
    148     }
    149 }
    150