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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.wm;
import static android.app.ActivityManager.StackId.PINNED_STACK_ID;
import static android.view.Display.DEFAULT_DISPLAY;
import static android.view.WindowManager.INPUT_CONSUMER_NAVIGATION;
import static android.view.WindowManager.INPUT_CONSUMER_PIP;
import static android.view.WindowManager.INPUT_CONSUMER_WALLPAPER;
import static android.view.WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;
import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_DISABLE_WALLPAPER_TOUCH_EVENTS;
import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_KEYGUARD;
import static android.view.WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
import static android.view.WindowManager.LayoutParams.TYPE_WALLPAPER;
import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_DRAG;
import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_FOCUS_LIGHT;
import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_INPUT;
import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_TASK_POSITIONING;
import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
import android.app.ActivityManager;
import android.graphics.Rect;
import android.os.Debug;
import android.os.Looper;
import android.os.RemoteException;
import android.util.ArrayMap;
import android.util.Log;
import android.util.Slog;
import android.view.InputChannel;
import android.view.InputEventReceiver;
import android.view.KeyEvent;
import android.view.WindowManager;
import android.view.WindowManagerPolicy;
import com.android.server.input.InputApplicationHandle;
import com.android.server.input.InputManagerService;
import com.android.server.input.InputWindowHandle;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Set;
import java.util.function.Consumer;
final class InputMonitor implements InputManagerService.WindowManagerCallbacks {
private final WindowManagerService mService;
// Current window with input focus for keys and other non-touch events. May be null.
private WindowState mInputFocus;
// When true, prevents input dispatch from proceeding until set to false again.
private boolean mInputDispatchFrozen;
// The reason the input is currently frozen or null if the input isn't frozen.
private String mInputFreezeReason = null;
// When true, input dispatch proceeds normally. Otherwise all events are dropped.
// Initially false, so that input does not get dispatched until boot is finished at
// which point the ActivityManager will enable dispatching.
private boolean mInputDispatchEnabled;
// When true, need to call updateInputWindowsLw().
private boolean mUpdateInputWindowsNeeded = true;
// Array of window handles to provide to the input dispatcher.
private InputWindowHandle[] mInputWindowHandles;
private int mInputWindowHandleCount;
private InputWindowHandle mFocusedInputWindowHandle;
private boolean mAddInputConsumerHandle;
private boolean mAddPipInputConsumerHandle;
private boolean mAddWallpaperInputConsumerHandle;
private boolean mDisableWallpaperTouchEvents;
private final Rect mTmpRect = new Rect();
private final UpdateInputForAllWindowsConsumer mUpdateInputForAllWindowsConsumer =
new UpdateInputForAllWindowsConsumer();
// Set to true when the first input device configuration change notification
// is received to indicate that the input devices are ready.
private final Object mInputDevicesReadyMonitor = new Object();
private boolean mInputDevicesReady;
/**
* The set of input consumer added to the window manager by name, which consumes input events
* for the windows below it.
*/
private final ArrayMap<String, InputConsumerImpl> mInputConsumers = new ArrayMap();
private static final class EventReceiverInputConsumer extends InputConsumerImpl
implements WindowManagerPolicy.InputConsumer {
private InputMonitor mInputMonitor;
private final InputEventReceiver mInputEventReceiver;
EventReceiverInputConsumer(WindowManagerService service, InputMonitor monitor,
Looper looper, String name,
InputEventReceiver.Factory inputEventReceiverFactory) {
super(service, name, null);
mInputMonitor = monitor;
mInputEventReceiver = inputEventReceiverFactory.createInputEventReceiver(
mClientChannel, looper);
}
@Override
public void dismiss() {
synchronized (mService.mWindowMap) {
if (mInputMonitor.destroyInputConsumer(mWindowHandle.name)) {
mInputEventReceiver.dispose();
}
}
}
}
public InputMonitor(WindowManagerService service) {
mService = service;
}
private void addInputConsumer(String name, InputConsumerImpl consumer) {
mInputConsumers.put(name, consumer);
updateInputWindowsLw(true /* force */);
}
boolean destroyInputConsumer(String name) {
if (disposeInputConsumer(mInputConsumers.remove(name))) {
updateInputWindowsLw(true /* force */);
return true;
}
return false;
}
private boolean disposeInputConsumer(InputConsumerImpl consumer) {
if (consumer != null) {
consumer.disposeChannelsLw();
return true;
}
return false;
}
InputConsumerImpl getInputConsumer(String name, int displayId) {
// TODO(multi-display): Allow input consumers on non-default displays?
return (displayId == DEFAULT_DISPLAY) ? mInputConsumers.get(name) : null;
}
void layoutInputConsumers(int dw, int dh) {
for (int i = mInputConsumers.size() - 1; i >= 0; i--) {
mInputConsumers.valueAt(i).layout(dw, dh);
}
}
WindowManagerPolicy.InputConsumer createInputConsumer(Looper looper, String name,
InputEventReceiver.Factory inputEventReceiverFactory) {
if (mInputConsumers.containsKey(name)) {
throw new IllegalStateException("Existing input consumer found with name: " + name);
}
final EventReceiverInputConsumer consumer = new EventReceiverInputConsumer(mService,
this, looper, name, inputEventReceiverFactory);
addInputConsumer(name, consumer);
return consumer;
}
void createInputConsumer(String name, InputChannel inputChannel) {
if (mInputConsumers.containsKey(name)) {
throw new IllegalStateException("Existing input consumer found with name: " + name);
}
final InputConsumerImpl consumer = new InputConsumerImpl(mService, name, inputChannel);
switch (name) {
case INPUT_CONSUMER_WALLPAPER:
consumer.mWindowHandle.hasWallpaper = true;
break;
case INPUT_CONSUMER_PIP:
// The touchable region of the Pip input window is cropped to the bounds of the
// stack, and we need FLAG_NOT_TOUCH_MODAL to ensure other events fall through
consumer.mWindowHandle.layoutParamsFlags |= FLAG_NOT_TOUCH_MODAL;
break;
}
addInputConsumer(name, consumer);
}
/* Notifies the window manager about a broken input channel.
*
* Called by the InputManager.
*/
@Override
public void notifyInputChannelBroken(InputWindowHandle inputWindowHandle) {
if (inputWindowHandle == null) {
return;
}
synchronized (mService.mWindowMap) {
WindowState windowState = (WindowState) inputWindowHandle.windowState;
if (windowState != null) {
Slog.i(TAG_WM, "WINDOW DIED " + windowState);
windowState.removeIfPossible();
}
}
}
/* Notifies the window manager about an application that is not responding.
* Returns a new timeout to continue waiting in nanoseconds, or 0 to abort dispatch.
*
* Called by the InputManager.
*/
@Override
public long notifyANR(InputApplicationHandle inputApplicationHandle,
InputWindowHandle inputWindowHandle, String reason) {
AppWindowToken appWindowToken = null;
WindowState windowState = null;
boolean aboveSystem = false;
synchronized (mService.mWindowMap) {
if (inputWindowHandle != null) {
windowState = (WindowState) inputWindowHandle.windowState;
if (windowState != null) {
appWindowToken = windowState.mAppToken;
}
}
if (appWindowToken == null && inputApplicationHandle != null) {
appWindowToken = (AppWindowToken)inputApplicationHandle.appWindowToken;
}
if (windowState != null) {
Slog.i(TAG_WM, "Input event dispatching timed out "
+ "sending to " + windowState.mAttrs.getTitle()
+ ". Reason: " + reason);
// Figure out whether this window is layered above system windows.
// We need to do this here to help the activity manager know how to
// layer its ANR dialog.
int systemAlertLayer = mService.mPolicy.getWindowLayerFromTypeLw(
TYPE_APPLICATION_OVERLAY, windowState.mOwnerCanAddInternalSystemWindow);
aboveSystem = windowState.mBaseLayer > systemAlertLayer;
} else if (appWindowToken != null) {
Slog.i(TAG_WM, "Input event dispatching timed out "
+ "sending to application " + appWindowToken.stringName
+ ". Reason: " + reason);
} else {
Slog.i(TAG_WM, "Input event dispatching timed out "
+ ". Reason: " + reason);
}
mService.saveANRStateLocked(appWindowToken, windowState, reason);
}
if (appWindowToken != null && appWindowToken.appToken != null) {
// Notify the activity manager about the timeout and let it decide whether
// to abort dispatching or keep waiting.
final AppWindowContainerController controller = appWindowToken.getController();
final boolean abort = controller != null && controller.keyDispatchingTimedOut(reason);
if (!abort) {
// The activity manager declined to abort dispatching.
// Wait a bit longer and timeout again later.
return appWindowToken.mInputDispatchingTimeoutNanos;
}
} else if (windowState != null) {
try {
// Notify the activity manager about the timeout and let it decide whether
// to abort dispatching or keep waiting.
long timeout = ActivityManager.getService().inputDispatchingTimedOut(
windowState.mSession.mPid, aboveSystem, reason);
if (timeout >= 0) {
// The activity manager declined to abort dispatching.
// Wait a bit longer and timeout again later.
return timeout * 1000000L; // nanoseconds
}
} catch (RemoteException ex) {
}
}
return 0; // abort dispatching
}
void addInputWindowHandle(final InputWindowHandle windowHandle) {
if (mInputWindowHandles == null) {
mInputWindowHandles = new InputWindowHandle[16];
}
if (mInputWindowHandleCount >= mInputWindowHandles.length) {
mInputWindowHandles = Arrays.copyOf(mInputWindowHandles,
mInputWindowHandleCount * 2);
}
mInputWindowHandles[mInputWindowHandleCount++] = windowHandle;
}
void addInputWindowHandle(final InputWindowHandle inputWindowHandle,
final WindowState child, int flags, final int type, final boolean isVisible,
final boolean hasFocus, final boolean hasWallpaper) {
// Add a window to our list of input windows.
inputWindowHandle.name = child.toString();
flags = child.getTouchableRegion(inputWindowHandle.touchableRegion, flags);
inputWindowHandle.layoutParamsFlags = flags;
inputWindowHandle.layoutParamsType = type;
inputWindowHandle.dispatchingTimeoutNanos = child.getInputDispatchingTimeoutNanos();
inputWindowHandle.visible = isVisible;
inputWindowHandle.canReceiveKeys = child.canReceiveKeys();
inputWindowHandle.hasFocus = hasFocus;
inputWindowHandle.hasWallpaper = hasWallpaper;
inputWindowHandle.paused = child.mAppToken != null ? child.mAppToken.paused : false;
inputWindowHandle.layer = child.mLayer;
inputWindowHandle.ownerPid = child.mSession.mPid;
inputWindowHandle.ownerUid = child.mSession.mUid;
inputWindowHandle.inputFeatures = child.mAttrs.inputFeatures;
final Rect frame = child.mFrame;
inputWindowHandle.frameLeft = frame.left;
inputWindowHandle.frameTop = frame.top;
inputWindowHandle.frameRight = frame.right;
inputWindowHandle.frameBottom = frame.bottom;
if (child.mGlobalScale != 1) {
// If we are scaling the window, input coordinates need
// to be inversely scaled to map from what is on screen
// to what is actually being touched in the UI.
inputWindowHandle.scaleFactor = 1.0f/child.mGlobalScale;
} else {
inputWindowHandle.scaleFactor = 1;
}
if (DEBUG_INPUT) {
Slog.d(TAG_WM, "addInputWindowHandle: "
+ child + ", " + inputWindowHandle);
}
addInputWindowHandle(inputWindowHandle);
if (hasFocus) {
mFocusedInputWindowHandle = inputWindowHandle;
}
}
private void clearInputWindowHandlesLw() {
while (mInputWindowHandleCount != 0) {
mInputWindowHandles[--mInputWindowHandleCount] = null;
}
mFocusedInputWindowHandle = null;
}
void setUpdateInputWindowsNeededLw() {
mUpdateInputWindowsNeeded = true;
}
/* Updates the cached window information provided to the input dispatcher. */
void updateInputWindowsLw(boolean force) {
if (!force && !mUpdateInputWindowsNeeded) {
return;
}
mUpdateInputWindowsNeeded = false;
if (false) Slog.d(TAG_WM, ">>>>>> ENTERED updateInputWindowsLw");
// Populate the input window list with information about all of the windows that
// could potentially receive input.
// As an optimization, we could try to prune the list of windows but this turns
// out to be difficult because only the native code knows for sure which window
// currently has touch focus.
// If there's a drag in flight, provide a pseudo-window to catch drag input
final boolean inDrag = (mService.mDragState != null);
if (inDrag) {
if (DEBUG_DRAG) {
Log.d(TAG_WM, "Inserting drag window");
}
final InputWindowHandle dragWindowHandle = mService.mDragState.getInputWindowHandle();
if (dragWindowHandle != null) {
addInputWindowHandle(dragWindowHandle);
} else {
Slog.w(TAG_WM, "Drag is in progress but there is no "
+ "drag window handle.");
}
}
final boolean inPositioning = (mService.mTaskPositioner != null);
if (inPositioning) {
if (DEBUG_TASK_POSITIONING) {
Log.d(TAG_WM, "Inserting window handle for repositioning");
}
final InputWindowHandle dragWindowHandle = mService.mTaskPositioner.mDragWindowHandle;
if (dragWindowHandle != null) {
addInputWindowHandle(dragWindowHandle);
} else {
Slog.e(TAG_WM,
"Repositioning is in progress but there is no drag window handle.");
}
}
// Add all windows on the default display.
mUpdateInputForAllWindowsConsumer.updateInputWindows(inDrag);
if (false) Slog.d(TAG_WM, "<<<<<<< EXITED updateInputWindowsLw");
}
/* Notifies that the input device configuration has changed. */
@Override
public void notifyConfigurationChanged() {
// TODO(multi-display): Notify proper displays that are associated with this input device.
mService.sendNewConfiguration(DEFAULT_DISPLAY);
synchronized (mInputDevicesReadyMonitor) {
if (!mInputDevicesReady) {
mInputDevicesReady = true;
mInputDevicesReadyMonitor.notifyAll();
}
}
}
/* Waits until the built-in input devices have been configured. */
public boolean waitForInputDevicesReady(long timeoutMillis) {
synchronized (mInputDevicesReadyMonitor) {
if (!mInputDevicesReady) {
try {
mInputDevicesReadyMonitor.wait(timeoutMillis);
} catch (InterruptedException ex) {
}
}
return mInputDevicesReady;
}
}
/* Notifies that the lid switch changed state. */
@Override
public void notifyLidSwitchChanged(long whenNanos, boolean lidOpen) {
mService.mPolicy.notifyLidSwitchChanged(whenNanos, lidOpen);
}
/* Notifies that the camera lens cover state has changed. */
@Override
public void notifyCameraLensCoverSwitchChanged(long whenNanos, boolean lensCovered) {
mService.mPolicy.notifyCameraLensCoverSwitchChanged(whenNanos, lensCovered);
}
/* Provides an opportunity for the window manager policy to intercept early key
* processing as soon as the key has been read from the device. */
@Override
public int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) {
return mService.mPolicy.interceptKeyBeforeQueueing(event, policyFlags);
}
/* Provides an opportunity for the window manager policy to intercept early motion event
* processing when the device is in a non-interactive state since these events are normally
* dropped. */
@Override
public int interceptMotionBeforeQueueingNonInteractive(long whenNanos, int policyFlags) {
return mService.mPolicy.interceptMotionBeforeQueueingNonInteractive(
whenNanos, policyFlags);
}
/* Provides an opportunity for the window manager policy to process a key before
* ordinary dispatch. */
@Override
public long interceptKeyBeforeDispatching(
InputWindowHandle focus, KeyEvent event, int policyFlags) {
WindowState windowState = focus != null ? (WindowState) focus.windowState : null;
return mService.mPolicy.interceptKeyBeforeDispatching(windowState, event, policyFlags);
}
/* Provides an opportunity for the window manager policy to process a key that
* the application did not handle. */
@Override
public KeyEvent dispatchUnhandledKey(
InputWindowHandle focus, KeyEvent event, int policyFlags) {
WindowState windowState = focus != null ? (WindowState) focus.windowState : null;
return mService.mPolicy.dispatchUnhandledKey(windowState, event, policyFlags);
}
/* Callback to get pointer layer. */
@Override
public int getPointerLayer() {
return mService.mPolicy.getWindowLayerFromTypeLw(WindowManager.LayoutParams.TYPE_POINTER)
* WindowManagerService.TYPE_LAYER_MULTIPLIER
+ WindowManagerService.TYPE_LAYER_OFFSET;
}
/* Called when the current input focus changes.
* Layer assignment is assumed to be complete by the time this is called.
*/
public void setInputFocusLw(WindowState newWindow, boolean updateInputWindows) {
if (DEBUG_FOCUS_LIGHT || DEBUG_INPUT) {
Slog.d(TAG_WM, "Input focus has changed to " + newWindow);
}
if (newWindow != mInputFocus) {
if (newWindow != null && newWindow.canReceiveKeys()) {
// Displaying a window implicitly causes dispatching to be unpaused.
// This is to protect against bugs if someone pauses dispatching but
// forgets to resume.
newWindow.mToken.paused = false;
}
mInputFocus = newWindow;
setUpdateInputWindowsNeededLw();
if (updateInputWindows) {
updateInputWindowsLw(false /*force*/);
}
}
}
public void setFocusedAppLw(AppWindowToken newApp) {
// Focused app has changed.
if (newApp == null) {
mService.mInputManager.setFocusedApplication(null);
} else {
final InputApplicationHandle handle = newApp.mInputApplicationHandle;
handle.name = newApp.toString();
handle.dispatchingTimeoutNanos = newApp.mInputDispatchingTimeoutNanos;
mService.mInputManager.setFocusedApplication(handle);
}
}
public void pauseDispatchingLw(WindowToken window) {
if (! window.paused) {
if (DEBUG_INPUT) {
Slog.v(TAG_WM, "Pausing WindowToken " + window);
}
window.paused = true;
updateInputWindowsLw(true /*force*/);
}
}
public void resumeDispatchingLw(WindowToken window) {
if (window.paused) {
if (DEBUG_INPUT) {
Slog.v(TAG_WM, "Resuming WindowToken " + window);
}
window.paused = false;
updateInputWindowsLw(true /*force*/);
}
}
public void freezeInputDispatchingLw() {
if (!mInputDispatchFrozen) {
if (DEBUG_INPUT) {
Slog.v(TAG_WM, "Freezing input dispatching");
}
mInputDispatchFrozen = true;
if (DEBUG_INPUT || true) {
mInputFreezeReason = Debug.getCallers(6);
}
updateInputDispatchModeLw();
}
}
public void thawInputDispatchingLw() {
if (mInputDispatchFrozen) {
if (DEBUG_INPUT) {
Slog.v(TAG_WM, "Thawing input dispatching");
}
mInputDispatchFrozen = false;
mInputFreezeReason = null;
updateInputDispatchModeLw();
}
}
public void setEventDispatchingLw(boolean enabled) {
if (mInputDispatchEnabled != enabled) {
if (DEBUG_INPUT) {
Slog.v(TAG_WM, "Setting event dispatching to " + enabled);
}
mInputDispatchEnabled = enabled;
updateInputDispatchModeLw();
}
}
private void updateInputDispatchModeLw() {
mService.mInputManager.setInputDispatchMode(mInputDispatchEnabled, mInputDispatchFrozen);
}
void dump(PrintWriter pw, String prefix) {
if (mInputFreezeReason != null) {
pw.println(prefix + "mInputFreezeReason=" + mInputFreezeReason);
}
final Set<String> inputConsumerKeys = mInputConsumers.keySet();
if (!inputConsumerKeys.isEmpty()) {
pw.println(prefix + "InputConsumers:");
for (String key : inputConsumerKeys) {
pw.println(prefix + " name=" + key);
}
}
}
private final class UpdateInputForAllWindowsConsumer implements Consumer<WindowState> {
InputConsumerImpl navInputConsumer;
InputConsumerImpl pipInputConsumer;
InputConsumerImpl wallpaperInputConsumer;
Rect pipTouchableBounds;
boolean inDrag;
WallpaperController wallpaperController;
private void updateInputWindows(boolean inDrag) {
// TODO: multi-display
navInputConsumer = getInputConsumer(INPUT_CONSUMER_NAVIGATION, DEFAULT_DISPLAY);
pipInputConsumer = getInputConsumer(INPUT_CONSUMER_PIP, DEFAULT_DISPLAY);
wallpaperInputConsumer = getInputConsumer(INPUT_CONSUMER_WALLPAPER, DEFAULT_DISPLAY);
mAddInputConsumerHandle = navInputConsumer != null;
mAddPipInputConsumerHandle = pipInputConsumer != null;
mAddWallpaperInputConsumerHandle = wallpaperInputConsumer != null;
mTmpRect.setEmpty();
pipTouchableBounds = mAddPipInputConsumerHandle ? mTmpRect : null;
mDisableWallpaperTouchEvents = false;
this.inDrag = inDrag;
wallpaperController = mService.mRoot.mWallpaperController;
mService.mRoot.forAllWindows(this, true /* traverseTopToBottom */);
if (mAddWallpaperInputConsumerHandle) {
// No visible wallpaper found, add the wallpaper input consumer at the end.
addInputWindowHandle(wallpaperInputConsumer.mWindowHandle);
}
// Send windows to native code.
mService.mInputManager.setInputWindows(mInputWindowHandles, mFocusedInputWindowHandle);
clearInputWindowHandlesLw();
}
@Override
public void accept(WindowState w) {
final InputChannel inputChannel = w.mInputChannel;
final InputWindowHandle inputWindowHandle = w.mInputWindowHandle;
if (inputChannel == null || inputWindowHandle == null || w.mRemoved
|| w.canReceiveTouchInput()) {
// Skip this window because it cannot possibly receive input.
return;
}
final int flags = w.mAttrs.flags;
final int privateFlags = w.mAttrs.privateFlags;
final int type = w.mAttrs.type;
final boolean hasFocus = w == mInputFocus;
final boolean isVisible = w.isVisibleLw();
if (w.getStackId() == PINNED_STACK_ID) {
if (mAddPipInputConsumerHandle
&& (inputWindowHandle.layer <= pipInputConsumer.mWindowHandle.layer)) {
// Update the bounds of the Pip input consumer to match the Pinned stack
w.getStack().getBounds(pipTouchableBounds);
pipInputConsumer.mWindowHandle.touchableRegion.set(pipTouchableBounds);
addInputWindowHandle(pipInputConsumer.mWindowHandle);
mAddPipInputConsumerHandle = false;
}
// TODO: Fix w.canReceiveTouchInput() to handle this case
if (!hasFocus) {
// Skip this pinned stack window if it does not have focus
return;
}
}
if (mAddInputConsumerHandle
&& inputWindowHandle.layer <= navInputConsumer.mWindowHandle.layer) {
addInputWindowHandle(navInputConsumer.mWindowHandle);
mAddInputConsumerHandle = false;
}
if (mAddWallpaperInputConsumerHandle) {
if (w.mAttrs.type == TYPE_WALLPAPER && w.isVisibleLw()) {
// Add the wallpaper input consumer above the first visible wallpaper.
addInputWindowHandle(wallpaperInputConsumer.mWindowHandle);
mAddWallpaperInputConsumerHandle = false;
}
}
if ((privateFlags & PRIVATE_FLAG_DISABLE_WALLPAPER_TOUCH_EVENTS) != 0) {
mDisableWallpaperTouchEvents = true;
}
final boolean hasWallpaper = wallpaperController.isWallpaperTarget(w)
&& (privateFlags & PRIVATE_FLAG_KEYGUARD) == 0
&& !mDisableWallpaperTouchEvents;
// If there's a drag in progress and 'child' is a potential drop target,
// make sure it's been told about the drag
if (inDrag && isVisible && w.getDisplayContent().isDefaultDisplay) {
mService.mDragState.sendDragStartedIfNeededLw(w);
}
addInputWindowHandle(
inputWindowHandle, w, flags, type, isVisible, hasFocus, hasWallpaper);
}
}
}