DisplayContent.java revision 2d5618c22101cfc4d6478cfe1d846798389540c1 
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    private final DisplayInfo mDisplayInfo = new DisplayInfo();
70    private final Display mDisplay;
71
72    // Accessed directly by all users.
73    boolean layoutNeeded;
74    int pendingLayoutChanges;
75    final boolean isDefaultDisplay;
76
77    /**
78     * @param display May not be null.
79     */
80    DisplayContent(Display display) {
81        mDisplay = display;
82        mDisplayId = display.getDisplayId();
83        display.getDisplayInfo(mDisplayInfo);
84        isDefaultDisplay = mDisplayId == Display.DEFAULT_DISPLAY;
85    }
86
87    int getDisplayId() {
88        return mDisplayId;
89    }
90
91    WindowList getWindowList() {
92        return mWindows;
93    }
94
95    Display getDisplay() {
96        return mDisplay;
97    }
98
99    DisplayInfo getDisplayInfo() {
100        return mDisplayInfo;
101    }
102
103    public void updateDisplayInfo() {
104        mDisplay.getDisplayInfo(mDisplayInfo);
105    }
106
107    public void dump(String prefix, PrintWriter pw) {
108        pw.print(prefix); pw.print("Display: mDisplayId="); pw.println(mDisplayId);
109        final String subPrefix = "  " + prefix;
110        pw.print(subPrefix); pw.print("init="); pw.print(mInitialDisplayWidth); pw.print("x");
111            pw.print(mInitialDisplayHeight); pw.print(" "); pw.print(mInitialDisplayDensity);
112            pw.print("dpi");
113            if (mInitialDisplayWidth != mBaseDisplayWidth
114                    || mInitialDisplayHeight != mBaseDisplayHeight
115                    || mInitialDisplayDensity != mBaseDisplayDensity) {
116                pw.print(" base=");
117                pw.print(mBaseDisplayWidth); pw.print("x"); pw.print(mBaseDisplayHeight);
118                pw.print(" "); pw.print(mBaseDisplayDensity); pw.print("dpi");
119            }
120            pw.print(" cur=");
121            pw.print(mDisplayInfo.logicalWidth);
122            pw.print("x"); pw.print(mDisplayInfo.logicalHeight);
123            pw.print(" app=");
124            pw.print(mDisplayInfo.appWidth);
125            pw.print("x"); pw.print(mDisplayInfo.appHeight);
126            pw.print(" rng="); pw.print(mDisplayInfo.smallestNominalAppWidth);
127            pw.print("x"); pw.print(mDisplayInfo.smallestNominalAppHeight);
128            pw.print("-"); pw.print(mDisplayInfo.largestNominalAppWidth);
129            pw.print("x"); pw.println(mDisplayInfo.largestNominalAppHeight);
130        pw.print(subPrefix); pw.print("layoutNeeded="); pw.print(layoutNeeded);
131        if (mMagnificationSpec != null) {
132            pw.print(" mMagnificationSpec="); pw.print(mMagnificationSpec);
133        }
134        pw.println();
135    }
136}
137