DisplayContent.java revision 59c009776dae5ccbdfb93d7151ff2065ca049dc3 
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.view.DisplayInfo;
20
21import java.io.PrintWriter;
22import java.util.ArrayList;
23
24class DisplayContentList extends ArrayList<DisplayContent> {
25}
26
27/**
28 * Utility class for keeping track of the WindowStates and other pertinent contents of a
29 * particular Display.
30 *
31 * IMPORTANT: No method from this class should ever be used without holding
32 * WindowManagerService.mWindowMap.
33 */
34class DisplayContent {
35
36    /** Unique identifier of this stack. */
37    private final int mDisplayId;
38
39    /** Z-ordered (bottom-most first) list of all Window objects. Assigned to an element
40     * from mDisplayWindows; */
41    private WindowList mWindows = new WindowList();
42
43
44    // This protects the following display size properties, so that
45    // getDisplaySize() doesn't need to acquire the global lock.  This is
46    // needed because the window manager sometimes needs to use ActivityThread
47    // while it has its global state locked (for example to load animation
48    // resources), but the ActivityThread also needs get the current display
49    // size sometimes when it has its package lock held.
50    //
51    // These will only be modified with both mWindowMap and mDisplaySizeLock
52    // held (in that order) so the window manager doesn't need to acquire this
53    // lock when needing these values in its normal operation.
54    final Object mDisplaySizeLock = new Object();
55    int mInitialDisplayWidth = 0;
56    int mInitialDisplayHeight = 0;
57    int mBaseDisplayWidth = 0;
58    int mBaseDisplayHeight = 0;
59    final DisplayInfo mDisplayInfo = new DisplayInfo();
60
61    DisplayContent(final int displayId) {
62        mDisplayId = displayId;
63    }
64
65    int getDisplayId() {
66        return mDisplayId;
67    }
68
69    WindowList getWindowList() {
70        return mWindows;
71    }
72
73    DisplayInfo getDisplayInfo() {
74        return mDisplayInfo;
75    }
76
77    public void dump(PrintWriter pw) {
78        pw.print("  Display: mDisplayId="); pw.println(mDisplayId);
79        pw.print("  init="); pw.print(mInitialDisplayWidth); pw.print("x");
80        pw.print(mInitialDisplayHeight);
81        if (mInitialDisplayWidth != mBaseDisplayWidth
82                || mInitialDisplayHeight != mBaseDisplayHeight) {
83            pw.print(" base=");
84            pw.print(mBaseDisplayWidth); pw.print("x"); pw.print(mBaseDisplayHeight);
85        }
86        if (mInitialDisplayWidth != mDisplayInfo.logicalWidth
87                || mInitialDisplayHeight != mDisplayInfo.logicalHeight) {
88            pw.print(" init="); pw.print(mInitialDisplayWidth);
89            pw.print("x"); pw.print(mInitialDisplayHeight);
90        }
91        pw.print(" cur=");
92        pw.print(mDisplayInfo.logicalWidth);
93        pw.print("x"); pw.print(mDisplayInfo.logicalHeight);
94        pw.print(" app=");
95        pw.print(mDisplayInfo.appWidth);
96        pw.print("x"); pw.print(mDisplayInfo.appHeight);
97        pw.print(" rng="); pw.print(mDisplayInfo.smallestNominalAppWidth);
98        pw.print("x"); pw.print(mDisplayInfo.smallestNominalAppHeight);
99        pw.print("-"); pw.print(mDisplayInfo.largestNominalAppWidth);
100        pw.print("x"); pw.println(mDisplayInfo.largestNominalAppHeight);
101        pw.println();
102    }
103}
104