DisplayContent.java revision 1cf70bbf96930662cab0e699d70b62865766ff52 
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
17package com.android.server.wm;
18
19import android.os.RemoteCallbackList;
20import android.view.Display;
21import android.view.DisplayInfo;
22import android.view.IDisplayContentChangeListener;
23
24import java.io.PrintWriter;
25import java.util.ArrayList;
26
27class DisplayContentList extends ArrayList<DisplayContent> {
28}
29
30/**
31 * Utility class for keeping track of the WindowStates and other pertinent contents of a
32 * particular Display.
33 *
34 * IMPORTANT: No method from this class should ever be used without holding
35 * WindowManagerService.mWindowMap.
36 */
37class DisplayContent {
38
39    /** Unique identifier of this stack. */
40    private final int mDisplayId;
41
42    /** Z-ordered (bottom-most first) list of all Window objects. Assigned to an element
43     * from mDisplayWindows; */
44    private WindowList mWindows = new WindowList();
45
46    // Specification for magnifying the display content.
47    MagnificationSpec mMagnificationSpec;
48
49    // Callback for observing content changes on a display.
50    RemoteCallbackList<IDisplayContentChangeListener> mDisplayContentChangeListeners;
51
52    // This protects the following display size properties, so that
53    // getDisplaySize() doesn't need to acquire the global lock.  This is
54    // needed because the window manager sometimes needs to use ActivityThread
55    // while it has its global state locked (for example to load animation
56    // resources), but the ActivityThread also needs get the current display
57    // size sometimes when it has its package lock held.
58    //
59    // These will only be modified with both mWindowMap and mDisplaySizeLock
60    // held (in that order) so the window manager doesn't need to acquire this
61    // lock when needing these values in its normal operation.
62    final Object mDisplaySizeLock = new Object();
63    int mInitialDisplayWidth = 0;
64    int mInitialDisplayHeight = 0;
65    int mInitialDisplayDensity = 0;
66    int mBaseDisplayWidth = 0;
67    int mBaseDisplayHeight = 0;
68    int mBaseDisplayDensity = 0;
69    final DisplayInfo mDisplayInfo = new DisplayInfo();
70    final Display mDisplay;
71
72    // Accessed directly by all users.
73    boolean layoutNeeded;
74    int pendingLayoutChanges;
75    final boolean isDefaultDisplay;
76
77    DisplayContent(Display display) {
78        mDisplay = display;
79        mDisplayId = display.getDisplayId();
80        display.getDisplayInfo(mDisplayInfo);
81        isDefaultDisplay = mDisplayId == Display.DEFAULT_DISPLAY;
82    }
83
84    int getDisplayId() {
85        return mDisplayId;
86    }
87
88    WindowList getWindowList() {
89        return mWindows;
90    }
91
92    Display getDisplay() {
93        return mDisplay;
94    }
95
96    DisplayInfo getDisplayInfo() {
97        // TODO: Add a listener for changes to Display and update mDisplayInfo when appropriate.
98        return mDisplayInfo;
99    }
100
101    public void dump(PrintWriter pw) {
102        pw.print("  Display: mDisplayId="); pw.println(mDisplayId);
103        pw.print("  init="); pw.print(mInitialDisplayWidth); pw.print("x");
104        pw.print(mInitialDisplayHeight); pw.print(" "); pw.print(mInitialDisplayDensity);
105        pw.print("dpi");
106        if (mInitialDisplayWidth != mBaseDisplayWidth
107                || mInitialDisplayHeight != mBaseDisplayHeight
108                || mInitialDisplayDensity != mBaseDisplayDensity) {
109            pw.print(" base=");
110            pw.print(mBaseDisplayWidth); pw.print("x"); pw.print(mBaseDisplayHeight);
111            pw.print(" "); pw.print(mBaseDisplayDensity); pw.print("dpi");
112        }
113        pw.print(" cur=");
114        pw.print(mDisplayInfo.logicalWidth);
115        pw.print("x"); pw.print(mDisplayInfo.logicalHeight);
116        pw.print(" app=");
117        pw.print(mDisplayInfo.appWidth);
118        pw.print("x"); pw.print(mDisplayInfo.appHeight);
119        pw.print(" rng="); pw.print(mDisplayInfo.smallestNominalAppWidth);
120        pw.print("x"); pw.print(mDisplayInfo.smallestNominalAppHeight);
121        pw.print("-"); pw.print(mDisplayInfo.largestNominalAppWidth);
122        pw.print("x"); pw.println(mDisplayInfo.largestNominalAppHeight);
123        pw.print("  layoutNeeded="); pw.println(layoutNeeded);
124        pw.print("magnificationSpec="); pw.println(mMagnificationSpec.toString());
125        pw.println();
126    }
127}
128