| /* |
| * 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 android.view; |
| |
| import android.os.Build; |
| import android.util.Log; |
| |
| /** |
| * Checks whether a sequence of input events is self-consistent. |
| * Logs a description of each problem detected. |
| * <p> |
| * When a problem is detected, the event is tainted. This mechanism prevents the same |
| * error from being reported multiple times. |
| * </p> |
| * |
| * @hide |
| */ |
| public final class InputEventConsistencyVerifier { |
| private static final boolean IS_ENG_BUILD = Build.IS_ENG; |
| |
| private static final String EVENT_TYPE_KEY = "KeyEvent"; |
| private static final String EVENT_TYPE_TRACKBALL = "TrackballEvent"; |
| private static final String EVENT_TYPE_TOUCH = "TouchEvent"; |
| private static final String EVENT_TYPE_GENERIC_MOTION = "GenericMotionEvent"; |
| |
| // The number of recent events to log when a problem is detected. |
| // Can be set to 0 to disable logging recent events but the runtime overhead of |
| // this feature is negligible on current hardware. |
| private static final int RECENT_EVENTS_TO_LOG = 5; |
| |
| // The object to which the verifier is attached. |
| private final Object mCaller; |
| |
| // Consistency verifier flags. |
| private final int mFlags; |
| |
| // Tag for logging which a client can set to help distinguish the output |
| // from different verifiers since several can be active at the same time. |
| // If not provided defaults to the simple class name. |
| private final String mLogTag; |
| |
| // The most recently checked event and the nesting level at which it was checked. |
| // This is only set when the verifier is called from a nesting level greater than 0 |
| // so that the verifier can detect when it has been asked to verify the same event twice. |
| // It does not make sense to examine the contents of the last event since it may have |
| // been recycled. |
| private int mLastEventSeq; |
| private String mLastEventType; |
| private int mLastNestingLevel; |
| |
| // Copy of the most recent events. |
| private InputEvent[] mRecentEvents; |
| private boolean[] mRecentEventsUnhandled; |
| private int mMostRecentEventIndex; |
| |
| // Current event and its type. |
| private InputEvent mCurrentEvent; |
| private String mCurrentEventType; |
| |
| // Linked list of key state objects. |
| private KeyState mKeyStateList; |
| |
| // Current state of the trackball. |
| private boolean mTrackballDown; |
| private boolean mTrackballUnhandled; |
| |
| // Bitfield of pointer ids that are currently down. |
| // Assumes that the largest possible pointer id is 31, which is potentially subject to change. |
| // (See MAX_POINTER_ID in frameworks/base/include/ui/Input.h) |
| private int mTouchEventStreamPointers; |
| |
| // The device id and source of the current stream of touch events. |
| private int mTouchEventStreamDeviceId = -1; |
| private int mTouchEventStreamSource; |
| |
| // Set to true when we discover that the touch event stream is inconsistent. |
| // Reset on down or cancel. |
| private boolean mTouchEventStreamIsTainted; |
| |
| // Set to true if the touch event stream is partially unhandled. |
| private boolean mTouchEventStreamUnhandled; |
| |
| // Set to true if we received hover enter. |
| private boolean mHoverEntered; |
| |
| // The bitset of buttons which we've received ACTION_BUTTON_PRESS for. |
| private int mButtonsPressed; |
| |
| // The current violation message. |
| private StringBuilder mViolationMessage; |
| |
| /** |
| * Indicates that the verifier is intended to act on raw device input event streams. |
| * Disables certain checks for invariants that are established by the input dispatcher |
| * itself as it delivers input events, such as key repeating behavior. |
| */ |
| public static final int FLAG_RAW_DEVICE_INPUT = 1 << 0; |
| |
| /** |
| * Creates an input consistency verifier. |
| * @param caller The object to which the verifier is attached. |
| * @param flags Flags to the verifier, or 0 if none. |
| */ |
| public InputEventConsistencyVerifier(Object caller, int flags) { |
| this(caller, flags, null); |
| } |
| |
| /** |
| * Creates an input consistency verifier. |
| * @param caller The object to which the verifier is attached. |
| * @param flags Flags to the verifier, or 0 if none. |
| * @param logTag Tag for logging. If null defaults to the short class name. |
| */ |
| public InputEventConsistencyVerifier(Object caller, int flags, String logTag) { |
| this.mCaller = caller; |
| this.mFlags = flags; |
| this.mLogTag = (logTag != null) ? logTag : "InputEventConsistencyVerifier"; |
| } |
| |
| /** |
| * Determines whether the instrumentation should be enabled. |
| * @return True if it should be enabled. |
| */ |
| public static boolean isInstrumentationEnabled() { |
| return IS_ENG_BUILD; |
| } |
| |
| /** |
| * Resets the state of the input event consistency verifier. |
| */ |
| public void reset() { |
| mLastEventSeq = -1; |
| mLastNestingLevel = 0; |
| mTrackballDown = false; |
| mTrackballUnhandled = false; |
| mTouchEventStreamPointers = 0; |
| mTouchEventStreamIsTainted = false; |
| mTouchEventStreamUnhandled = false; |
| mHoverEntered = false; |
| mButtonsPressed = 0; |
| |
| while (mKeyStateList != null) { |
| final KeyState state = mKeyStateList; |
| mKeyStateList = state.next; |
| state.recycle(); |
| } |
| } |
| |
| /** |
| * Checks an arbitrary input event. |
| * @param event The event. |
| * @param nestingLevel The nesting level: 0 if called from the base class, |
| * or 1 from a subclass. If the event was already checked by this consistency verifier |
| * at a higher nesting level, it will not be checked again. Used to handle the situation |
| * where a subclass dispatching method delegates to its superclass's dispatching method |
| * and both dispatching methods call into the consistency verifier. |
| */ |
| public void onInputEvent(InputEvent event, int nestingLevel) { |
| if (event instanceof KeyEvent) { |
| final KeyEvent keyEvent = (KeyEvent)event; |
| onKeyEvent(keyEvent, nestingLevel); |
| } else { |
| final MotionEvent motionEvent = (MotionEvent)event; |
| if (motionEvent.isTouchEvent()) { |
| onTouchEvent(motionEvent, nestingLevel); |
| } else if ((motionEvent.getSource() & InputDevice.SOURCE_CLASS_TRACKBALL) != 0) { |
| onTrackballEvent(motionEvent, nestingLevel); |
| } else { |
| onGenericMotionEvent(motionEvent, nestingLevel); |
| } |
| } |
| } |
| |
| /** |
| * Checks a key event. |
| * @param event The event. |
| * @param nestingLevel The nesting level: 0 if called from the base class, |
| * or 1 from a subclass. If the event was already checked by this consistency verifier |
| * at a higher nesting level, it will not be checked again. Used to handle the situation |
| * where a subclass dispatching method delegates to its superclass's dispatching method |
| * and both dispatching methods call into the consistency verifier. |
| */ |
| public void onKeyEvent(KeyEvent event, int nestingLevel) { |
| if (!startEvent(event, nestingLevel, EVENT_TYPE_KEY)) { |
| return; |
| } |
| |
| try { |
| ensureMetaStateIsNormalized(event.getMetaState()); |
| |
| final int action = event.getAction(); |
| final int deviceId = event.getDeviceId(); |
| final int source = event.getSource(); |
| final int keyCode = event.getKeyCode(); |
| switch (action) { |
| case KeyEvent.ACTION_DOWN: { |
| KeyState state = findKeyState(deviceId, source, keyCode, /*remove*/ false); |
| if (state != null) { |
| // If the key is already down, ensure it is a repeat. |
| // We don't perform this check when processing raw device input |
| // because the input dispatcher itself is responsible for setting |
| // the key repeat count before it delivers input events. |
| if (state.unhandled) { |
| state.unhandled = false; |
| } else if ((mFlags & FLAG_RAW_DEVICE_INPUT) == 0 |
| && event.getRepeatCount() == 0) { |
| problem("ACTION_DOWN but key is already down and this event " |
| + "is not a key repeat."); |
| } |
| } else { |
| addKeyState(deviceId, source, keyCode); |
| } |
| break; |
| } |
| case KeyEvent.ACTION_UP: { |
| KeyState state = findKeyState(deviceId, source, keyCode, /*remove*/ true); |
| if (state == null) { |
| problem("ACTION_UP but key was not down."); |
| } else { |
| state.recycle(); |
| } |
| break; |
| } |
| case KeyEvent.ACTION_MULTIPLE: |
| break; |
| default: |
| problem("Invalid action " + KeyEvent.actionToString(action) |
| + " for key event."); |
| break; |
| } |
| } finally { |
| finishEvent(); |
| } |
| } |
| |
| /** |
| * Checks a trackball event. |
| * @param event The event. |
| * @param nestingLevel The nesting level: 0 if called from the base class, |
| * or 1 from a subclass. If the event was already checked by this consistency verifier |
| * at a higher nesting level, it will not be checked again. Used to handle the situation |
| * where a subclass dispatching method delegates to its superclass's dispatching method |
| * and both dispatching methods call into the consistency verifier. |
| */ |
| public void onTrackballEvent(MotionEvent event, int nestingLevel) { |
| if (!startEvent(event, nestingLevel, EVENT_TYPE_TRACKBALL)) { |
| return; |
| } |
| |
| try { |
| ensureMetaStateIsNormalized(event.getMetaState()); |
| |
| final int action = event.getAction(); |
| final int source = event.getSource(); |
| if ((source & InputDevice.SOURCE_CLASS_TRACKBALL) != 0) { |
| switch (action) { |
| case MotionEvent.ACTION_DOWN: |
| if (mTrackballDown && !mTrackballUnhandled) { |
| problem("ACTION_DOWN but trackball is already down."); |
| } else { |
| mTrackballDown = true; |
| mTrackballUnhandled = false; |
| } |
| ensureHistorySizeIsZeroForThisAction(event); |
| ensurePointerCountIsOneForThisAction(event); |
| break; |
| case MotionEvent.ACTION_UP: |
| if (!mTrackballDown) { |
| problem("ACTION_UP but trackball is not down."); |
| } else { |
| mTrackballDown = false; |
| mTrackballUnhandled = false; |
| } |
| ensureHistorySizeIsZeroForThisAction(event); |
| ensurePointerCountIsOneForThisAction(event); |
| break; |
| case MotionEvent.ACTION_MOVE: |
| ensurePointerCountIsOneForThisAction(event); |
| break; |
| default: |
| problem("Invalid action " + MotionEvent.actionToString(action) |
| + " for trackball event."); |
| break; |
| } |
| |
| if (mTrackballDown && event.getPressure() <= 0) { |
| problem("Trackball is down but pressure is not greater than 0."); |
| } else if (!mTrackballDown && event.getPressure() != 0) { |
| problem("Trackball is up but pressure is not equal to 0."); |
| } |
| } else { |
| problem("Source was not SOURCE_CLASS_TRACKBALL."); |
| } |
| } finally { |
| finishEvent(); |
| } |
| } |
| |
| /** |
| * Checks a touch event. |
| * @param event The event. |
| * @param nestingLevel The nesting level: 0 if called from the base class, |
| * or 1 from a subclass. If the event was already checked by this consistency verifier |
| * at a higher nesting level, it will not be checked again. Used to handle the situation |
| * where a subclass dispatching method delegates to its superclass's dispatching method |
| * and both dispatching methods call into the consistency verifier. |
| */ |
| public void onTouchEvent(MotionEvent event, int nestingLevel) { |
| if (!startEvent(event, nestingLevel, EVENT_TYPE_TOUCH)) { |
| return; |
| } |
| |
| final int action = event.getAction(); |
| final boolean newStream = action == MotionEvent.ACTION_DOWN |
| || action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_OUTSIDE; |
| if (newStream && (mTouchEventStreamIsTainted || mTouchEventStreamUnhandled)) { |
| mTouchEventStreamIsTainted = false; |
| mTouchEventStreamUnhandled = false; |
| mTouchEventStreamPointers = 0; |
| } |
| if (mTouchEventStreamIsTainted) { |
| event.setTainted(true); |
| } |
| |
| try { |
| ensureMetaStateIsNormalized(event.getMetaState()); |
| |
| final int deviceId = event.getDeviceId(); |
| final int source = event.getSource(); |
| |
| if (!newStream && mTouchEventStreamDeviceId != -1 |
| && (mTouchEventStreamDeviceId != deviceId |
| || mTouchEventStreamSource != source)) { |
| problem("Touch event stream contains events from multiple sources: " |
| + "previous device id " + mTouchEventStreamDeviceId |
| + ", previous source " + Integer.toHexString(mTouchEventStreamSource) |
| + ", new device id " + deviceId |
| + ", new source " + Integer.toHexString(source)); |
| } |
| mTouchEventStreamDeviceId = deviceId; |
| mTouchEventStreamSource = source; |
| |
| final int pointerCount = event.getPointerCount(); |
| if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { |
| switch (action) { |
| case MotionEvent.ACTION_DOWN: |
| if (mTouchEventStreamPointers != 0) { |
| problem("ACTION_DOWN but pointers are already down. " |
| + "Probably missing ACTION_UP from previous gesture."); |
| } |
| ensureHistorySizeIsZeroForThisAction(event); |
| ensurePointerCountIsOneForThisAction(event); |
| mTouchEventStreamPointers = 1 << event.getPointerId(0); |
| break; |
| case MotionEvent.ACTION_UP: |
| ensureHistorySizeIsZeroForThisAction(event); |
| ensurePointerCountIsOneForThisAction(event); |
| mTouchEventStreamPointers = 0; |
| mTouchEventStreamIsTainted = false; |
| break; |
| case MotionEvent.ACTION_MOVE: { |
| final int expectedPointerCount = |
| Integer.bitCount(mTouchEventStreamPointers); |
| if (pointerCount != expectedPointerCount) { |
| problem("ACTION_MOVE contained " + pointerCount |
| + " pointers but there are currently " |
| + expectedPointerCount + " pointers down."); |
| mTouchEventStreamIsTainted = true; |
| } |
| break; |
| } |
| case MotionEvent.ACTION_CANCEL: |
| mTouchEventStreamPointers = 0; |
| mTouchEventStreamIsTainted = false; |
| break; |
| case MotionEvent.ACTION_OUTSIDE: |
| if (mTouchEventStreamPointers != 0) { |
| problem("ACTION_OUTSIDE but pointers are still down."); |
| } |
| ensureHistorySizeIsZeroForThisAction(event); |
| ensurePointerCountIsOneForThisAction(event); |
| mTouchEventStreamIsTainted = false; |
| break; |
| default: { |
| final int actionMasked = event.getActionMasked(); |
| final int actionIndex = event.getActionIndex(); |
| if (actionMasked == MotionEvent.ACTION_POINTER_DOWN) { |
| if (mTouchEventStreamPointers == 0) { |
| problem("ACTION_POINTER_DOWN but no other pointers were down."); |
| mTouchEventStreamIsTainted = true; |
| } |
| if (actionIndex < 0 || actionIndex >= pointerCount) { |
| problem("ACTION_POINTER_DOWN index is " + actionIndex |
| + " but the pointer count is " + pointerCount + "."); |
| mTouchEventStreamIsTainted = true; |
| } else { |
| final int id = event.getPointerId(actionIndex); |
| final int idBit = 1 << id; |
| if ((mTouchEventStreamPointers & idBit) != 0) { |
| problem("ACTION_POINTER_DOWN specified pointer id " + id |
| + " which is already down."); |
| mTouchEventStreamIsTainted = true; |
| } else { |
| mTouchEventStreamPointers |= idBit; |
| } |
| } |
| ensureHistorySizeIsZeroForThisAction(event); |
| } else if (actionMasked == MotionEvent.ACTION_POINTER_UP) { |
| if (actionIndex < 0 || actionIndex >= pointerCount) { |
| problem("ACTION_POINTER_UP index is " + actionIndex |
| + " but the pointer count is " + pointerCount + "."); |
| mTouchEventStreamIsTainted = true; |
| } else { |
| final int id = event.getPointerId(actionIndex); |
| final int idBit = 1 << id; |
| if ((mTouchEventStreamPointers & idBit) == 0) { |
| problem("ACTION_POINTER_UP specified pointer id " + id |
| + " which is not currently down."); |
| mTouchEventStreamIsTainted = true; |
| } else { |
| mTouchEventStreamPointers &= ~idBit; |
| } |
| } |
| ensureHistorySizeIsZeroForThisAction(event); |
| } else { |
| problem("Invalid action " + MotionEvent.actionToString(action) |
| + " for touch event."); |
| } |
| break; |
| } |
| } |
| } else { |
| problem("Source was not SOURCE_CLASS_POINTER."); |
| } |
| } finally { |
| finishEvent(); |
| } |
| } |
| |
| /** |
| * Checks a generic motion event. |
| * @param event The event. |
| * @param nestingLevel The nesting level: 0 if called from the base class, |
| * or 1 from a subclass. If the event was already checked by this consistency verifier |
| * at a higher nesting level, it will not be checked again. Used to handle the situation |
| * where a subclass dispatching method delegates to its superclass's dispatching method |
| * and both dispatching methods call into the consistency verifier. |
| */ |
| public void onGenericMotionEvent(MotionEvent event, int nestingLevel) { |
| if (!startEvent(event, nestingLevel, EVENT_TYPE_GENERIC_MOTION)) { |
| return; |
| } |
| |
| try { |
| ensureMetaStateIsNormalized(event.getMetaState()); |
| |
| final int action = event.getAction(); |
| final int source = event.getSource(); |
| final int buttonState = event.getButtonState(); |
| final int actionButton = event.getActionButton(); |
| if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { |
| switch (action) { |
| case MotionEvent.ACTION_HOVER_ENTER: |
| ensurePointerCountIsOneForThisAction(event); |
| mHoverEntered = true; |
| break; |
| case MotionEvent.ACTION_HOVER_MOVE: |
| ensurePointerCountIsOneForThisAction(event); |
| break; |
| case MotionEvent.ACTION_HOVER_EXIT: |
| ensurePointerCountIsOneForThisAction(event); |
| if (!mHoverEntered) { |
| problem("ACTION_HOVER_EXIT without prior ACTION_HOVER_ENTER"); |
| } |
| mHoverEntered = false; |
| break; |
| case MotionEvent.ACTION_SCROLL: |
| ensureHistorySizeIsZeroForThisAction(event); |
| ensurePointerCountIsOneForThisAction(event); |
| break; |
| case MotionEvent.ACTION_BUTTON_PRESS: |
| ensureActionButtonIsNonZeroForThisAction(event); |
| if ((mButtonsPressed & actionButton) != 0) { |
| problem("Action button for ACTION_BUTTON_PRESS event is " + |
| actionButton + ", but it has already been pressed and " + |
| "has yet to be released."); |
| } |
| |
| mButtonsPressed |= actionButton; |
| // The system will automatically mirror the stylus buttons onto the button |
| // state as the old set of generic buttons for apps targeting pre-M. If |
| // it looks this has happened, go ahead and set the generic buttons as |
| // pressed to prevent spurious errors. |
| if (actionButton == MotionEvent.BUTTON_STYLUS_PRIMARY && |
| (buttonState & MotionEvent.BUTTON_SECONDARY) != 0) { |
| mButtonsPressed |= MotionEvent.BUTTON_SECONDARY; |
| } else if (actionButton == MotionEvent.BUTTON_STYLUS_SECONDARY && |
| (buttonState & MotionEvent.BUTTON_TERTIARY) != 0) { |
| mButtonsPressed |= MotionEvent.BUTTON_TERTIARY; |
| } |
| |
| if (mButtonsPressed != buttonState) { |
| problem(String.format("Reported button state differs from " + |
| "expected button state based on press and release events. " + |
| "Is 0x%08x but expected 0x%08x.", |
| buttonState, mButtonsPressed)); |
| } |
| break; |
| case MotionEvent.ACTION_BUTTON_RELEASE: |
| ensureActionButtonIsNonZeroForThisAction(event); |
| if ((mButtonsPressed & actionButton) != actionButton) { |
| problem("Action button for ACTION_BUTTON_RELEASE event is " + |
| actionButton + ", but it was either never pressed or has " + |
| "already been released."); |
| } |
| |
| mButtonsPressed &= ~actionButton; |
| // The system will automatically mirror the stylus buttons onto the button |
| // state as the old set of generic buttons for apps targeting pre-M. If |
| // it looks this has happened, go ahead and set the generic buttons as |
| // released to prevent spurious errors. |
| if (actionButton == MotionEvent.BUTTON_STYLUS_PRIMARY && |
| (buttonState & MotionEvent.BUTTON_SECONDARY) == 0) { |
| mButtonsPressed &= ~MotionEvent.BUTTON_SECONDARY; |
| } else if (actionButton == MotionEvent.BUTTON_STYLUS_SECONDARY && |
| (buttonState & MotionEvent.BUTTON_TERTIARY) == 0) { |
| mButtonsPressed &= ~MotionEvent.BUTTON_TERTIARY; |
| } |
| |
| if (mButtonsPressed != buttonState) { |
| problem(String.format("Reported button state differs from " + |
| "expected button state based on press and release events. " + |
| "Is 0x%08x but expected 0x%08x.", |
| buttonState, mButtonsPressed)); |
| } |
| break; |
| default: |
| problem("Invalid action for generic pointer event."); |
| break; |
| } |
| } else if ((source & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { |
| switch (action) { |
| case MotionEvent.ACTION_MOVE: |
| ensurePointerCountIsOneForThisAction(event); |
| break; |
| default: |
| problem("Invalid action for generic joystick event."); |
| break; |
| } |
| } |
| } finally { |
| finishEvent(); |
| } |
| } |
| |
| /** |
| * Notifies the verifier that a given event was unhandled and the rest of the |
| * trace for the event should be ignored. |
| * This method should only be called if the event was previously checked by |
| * the consistency verifier using {@link #onInputEvent} and other methods. |
| * @param event The event. |
| * @param nestingLevel The nesting level: 0 if called from the base class, |
| * or 1 from a subclass. If the event was already checked by this consistency verifier |
| * at a higher nesting level, it will not be checked again. Used to handle the situation |
| * where a subclass dispatching method delegates to its superclass's dispatching method |
| * and both dispatching methods call into the consistency verifier. |
| */ |
| public void onUnhandledEvent(InputEvent event, int nestingLevel) { |
| if (nestingLevel != mLastNestingLevel) { |
| return; |
| } |
| |
| if (mRecentEventsUnhandled != null) { |
| mRecentEventsUnhandled[mMostRecentEventIndex] = true; |
| } |
| |
| if (event instanceof KeyEvent) { |
| final KeyEvent keyEvent = (KeyEvent)event; |
| final int deviceId = keyEvent.getDeviceId(); |
| final int source = keyEvent.getSource(); |
| final int keyCode = keyEvent.getKeyCode(); |
| final KeyState state = findKeyState(deviceId, source, keyCode, /*remove*/ false); |
| if (state != null) { |
| state.unhandled = true; |
| } |
| } else { |
| final MotionEvent motionEvent = (MotionEvent)event; |
| if (motionEvent.isTouchEvent()) { |
| mTouchEventStreamUnhandled = true; |
| } else if ((motionEvent.getSource() & InputDevice.SOURCE_CLASS_TRACKBALL) != 0) { |
| if (mTrackballDown) { |
| mTrackballUnhandled = true; |
| } |
| } |
| } |
| } |
| |
| private void ensureMetaStateIsNormalized(int metaState) { |
| final int normalizedMetaState = KeyEvent.normalizeMetaState(metaState); |
| if (normalizedMetaState != metaState) { |
| problem(String.format("Metastate not normalized. Was 0x%08x but expected 0x%08x.", |
| metaState, normalizedMetaState)); |
| } |
| } |
| |
| private void ensurePointerCountIsOneForThisAction(MotionEvent event) { |
| final int pointerCount = event.getPointerCount(); |
| if (pointerCount != 1) { |
| problem("Pointer count is " + pointerCount + " but it should always be 1 for " |
| + MotionEvent.actionToString(event.getAction())); |
| } |
| } |
| |
| private void ensureActionButtonIsNonZeroForThisAction(MotionEvent event) { |
| final int actionButton = event.getActionButton(); |
| if (actionButton == 0) { |
| problem("No action button set. Action button should always be non-zero for " + |
| MotionEvent.actionToString(event.getAction())); |
| |
| } |
| } |
| |
| private void ensureHistorySizeIsZeroForThisAction(MotionEvent event) { |
| final int historySize = event.getHistorySize(); |
| if (historySize != 0) { |
| problem("History size is " + historySize + " but it should always be 0 for " |
| + MotionEvent.actionToString(event.getAction())); |
| } |
| } |
| |
| private boolean startEvent(InputEvent event, int nestingLevel, String eventType) { |
| // Ignore the event if we already checked it at a higher nesting level. |
| final int seq = event.getSequenceNumber(); |
| if (seq == mLastEventSeq && nestingLevel < mLastNestingLevel |
| && eventType == mLastEventType) { |
| return false; |
| } |
| |
| if (nestingLevel > 0) { |
| mLastEventSeq = seq; |
| mLastEventType = eventType; |
| mLastNestingLevel = nestingLevel; |
| } else { |
| mLastEventSeq = -1; |
| mLastEventType = null; |
| mLastNestingLevel = 0; |
| } |
| |
| mCurrentEvent = event; |
| mCurrentEventType = eventType; |
| return true; |
| } |
| |
| private void finishEvent() { |
| if (mViolationMessage != null && mViolationMessage.length() != 0) { |
| if (!mCurrentEvent.isTainted()) { |
| // Write a log message only if the event was not already tainted. |
| mViolationMessage.append("\n in ").append(mCaller); |
| mViolationMessage.append("\n "); |
| appendEvent(mViolationMessage, 0, mCurrentEvent, false); |
| |
| if (RECENT_EVENTS_TO_LOG != 0 && mRecentEvents != null) { |
| mViolationMessage.append("\n -- recent events --"); |
| for (int i = 0; i < RECENT_EVENTS_TO_LOG; i++) { |
| final int index = (mMostRecentEventIndex + RECENT_EVENTS_TO_LOG - i) |
| % RECENT_EVENTS_TO_LOG; |
| final InputEvent event = mRecentEvents[index]; |
| if (event == null) { |
| break; |
| } |
| mViolationMessage.append("\n "); |
| appendEvent(mViolationMessage, i + 1, event, mRecentEventsUnhandled[index]); |
| } |
| } |
| |
| Log.d(mLogTag, mViolationMessage.toString()); |
| |
| // Taint the event so that we do not generate additional violations from it |
| // further downstream. |
| mCurrentEvent.setTainted(true); |
| } |
| mViolationMessage.setLength(0); |
| } |
| |
| if (RECENT_EVENTS_TO_LOG != 0) { |
| if (mRecentEvents == null) { |
| mRecentEvents = new InputEvent[RECENT_EVENTS_TO_LOG]; |
| mRecentEventsUnhandled = new boolean[RECENT_EVENTS_TO_LOG]; |
| } |
| final int index = (mMostRecentEventIndex + 1) % RECENT_EVENTS_TO_LOG; |
| mMostRecentEventIndex = index; |
| if (mRecentEvents[index] != null) { |
| mRecentEvents[index].recycle(); |
| } |
| mRecentEvents[index] = mCurrentEvent.copy(); |
| mRecentEventsUnhandled[index] = false; |
| } |
| |
| mCurrentEvent = null; |
| mCurrentEventType = null; |
| } |
| |
| private static void appendEvent(StringBuilder message, int index, |
| InputEvent event, boolean unhandled) { |
| message.append(index).append(": sent at ").append(event.getEventTimeNano()); |
| message.append(", "); |
| if (unhandled) { |
| message.append("(unhandled) "); |
| } |
| message.append(event); |
| } |
| |
| private void problem(String message) { |
| if (mViolationMessage == null) { |
| mViolationMessage = new StringBuilder(); |
| } |
| if (mViolationMessage.length() == 0) { |
| mViolationMessage.append(mCurrentEventType).append(": "); |
| } else { |
| mViolationMessage.append("\n "); |
| } |
| mViolationMessage.append(message); |
| } |
| |
| private KeyState findKeyState(int deviceId, int source, int keyCode, boolean remove) { |
| KeyState last = null; |
| KeyState state = mKeyStateList; |
| while (state != null) { |
| if (state.deviceId == deviceId && state.source == source |
| && state.keyCode == keyCode) { |
| if (remove) { |
| if (last != null) { |
| last.next = state.next; |
| } else { |
| mKeyStateList = state.next; |
| } |
| state.next = null; |
| } |
| return state; |
| } |
| last = state; |
| state = state.next; |
| } |
| return null; |
| } |
| |
| private void addKeyState(int deviceId, int source, int keyCode) { |
| KeyState state = KeyState.obtain(deviceId, source, keyCode); |
| state.next = mKeyStateList; |
| mKeyStateList = state; |
| } |
| |
| private static final class KeyState { |
| private static Object mRecycledListLock = new Object(); |
| private static KeyState mRecycledList; |
| |
| public KeyState next; |
| public int deviceId; |
| public int source; |
| public int keyCode; |
| public boolean unhandled; |
| |
| private KeyState() { |
| } |
| |
| public static KeyState obtain(int deviceId, int source, int keyCode) { |
| KeyState state; |
| synchronized (mRecycledListLock) { |
| state = mRecycledList; |
| if (state != null) { |
| mRecycledList = state.next; |
| } else { |
| state = new KeyState(); |
| } |
| } |
| state.deviceId = deviceId; |
| state.source = source; |
| state.keyCode = keyCode; |
| state.unhandled = false; |
| return state; |
| } |
| |
| public void recycle() { |
| synchronized (mRecycledListLock) { |
| next = mRecycledList; |
| mRecycledList = next; |
| } |
| } |
| } |
| } |
