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Diffstat (limited to 'core/java/android/webkit/WebViewInputDispatcher.java')
| -rw-r--r-- | core/java/android/webkit/WebViewInputDispatcher.java | 1293 |
1 files changed, 0 insertions, 1293 deletions
diff --git a/core/java/android/webkit/WebViewInputDispatcher.java b/core/java/android/webkit/WebViewInputDispatcher.java deleted file mode 100644 index f64547f255db..000000000000 --- a/core/java/android/webkit/WebViewInputDispatcher.java +++ /dev/null @@ -1,1293 +0,0 @@ -/* - * Copyright (C) 2012 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.webkit; - -import android.content.Context; -import android.os.Handler; -import android.os.Looper; -import android.os.Message; -import android.os.SystemClock; -import android.util.Log; -import android.view.MotionEvent; -import android.view.ViewConfiguration; - -/** - * Perform asynchronous dispatch of input events in a {@link WebView}. - * - * This dispatcher is shared by the UI thread ({@link WebViewClassic}) and web kit - * thread ({@link WebViewCore}). The UI thread enqueues events for - * processing, waits for the web kit thread to handle them, and then performs - * additional processing depending on the outcome. - * - * How it works: - * - * 1. The web view thread receives an input event from the input system on the UI - * thread in its {@link WebViewClassic#onTouchEvent} handler. It sends the input event - * to the dispatcher, then immediately returns true to the input system to indicate that - * it will handle the event. - * - * 2. The web kit thread is notified that an event has been enqueued. Meanwhile additional - * events may be enqueued from the UI thread. In some cases, the dispatcher may decide to - * coalesce motion events into larger batches or to cancel events that have been - * sitting in the queue for too long. - * - * 3. The web kit thread wakes up and handles all input events that are waiting for it. - * After processing each input event, it informs the dispatcher whether the web application - * has decided to handle the event itself and to prevent default event handling. - * - * 4. If web kit indicates that it wants to prevent default event handling, then web kit - * consumes the remainder of the gesture and web view receives a cancel event if - * needed. Otherwise, the web view handles the gesture on the UI thread normally. - * - * 5. If the web kit thread takes too long to handle an input event, then it loses the - * right to handle it. The dispatcher synthesizes a cancellation event for web kit and - * then tells the web view on the UI thread to handle the event that timed out along - * with the rest of the gesture. - * - * One thing to keep in mind about the dispatcher is that what goes into the dispatcher - * is not necessarily what the web kit or UI thread will see. As mentioned above, the - * dispatcher may tweak the input event stream to improve responsiveness. Both web view and - * web kit are guaranteed to perceive a consistent stream of input events but - * they might not always see the same events (especially if one decides - * to prevent the other from handling a particular gesture). - * - * This implementation very deliberately does not refer to the {@link WebViewClassic} - * or {@link WebViewCore} classes, preferring to communicate with them only via - * interfaces to avoid unintentional coupling to their implementation details. - * - * Currently, the input dispatcher only handles pointer events (includes touch, - * hover and scroll events). In principle, it could be extended to handle trackball - * and key events if needed. - * - * @hide - */ -final class WebViewInputDispatcher { - private static final String TAG = "WebViewInputDispatcher"; - private static final boolean DEBUG = false; - // This enables batching of MotionEvents. It will combine multiple MotionEvents - // together into a single MotionEvent if more events come in while we are - // still waiting on the processing of a previous event. - // If this is set to false, we will instead opt to drop ACTION_MOVE - // events we cannot keep up with. - // TODO: If batching proves to be working well, remove this - private static final boolean ENABLE_EVENT_BATCHING = true; - - private final Object mLock = new Object(); - - // Pool of queued input events. (guarded by mLock) - private static final int MAX_DISPATCH_EVENT_POOL_SIZE = 10; - private DispatchEvent mDispatchEventPool; - private int mDispatchEventPoolSize; - - // Posted state, tracks events posted to the dispatcher. (guarded by mLock) - private final TouchStream mPostTouchStream = new TouchStream(); - private boolean mPostSendTouchEventsToWebKit; - private boolean mPostDoNotSendTouchEventsToWebKitUntilNextGesture; - private boolean mPostLongPressScheduled; - private boolean mPostClickScheduled; - private boolean mPostShowTapHighlightScheduled; - private boolean mPostHideTapHighlightScheduled; - private int mPostLastWebKitXOffset; - private int mPostLastWebKitYOffset; - private float mPostLastWebKitScale; - - // State for event tracking (click, longpress, double tap, etc..) - private boolean mIsDoubleTapCandidate; - private boolean mIsTapCandidate; - private float mInitialDownX; - private float mInitialDownY; - private float mTouchSlopSquared; - private float mDoubleTapSlopSquared; - - // Web kit state, tracks events observed by web kit. (guarded by mLock) - private final DispatchEventQueue mWebKitDispatchEventQueue = new DispatchEventQueue(); - private final TouchStream mWebKitTouchStream = new TouchStream(); - private final WebKitCallbacks mWebKitCallbacks; - private final WebKitHandler mWebKitHandler; - private boolean mWebKitDispatchScheduled; - private boolean mWebKitTimeoutScheduled; - private long mWebKitTimeoutTime; - - // UI state, tracks events observed by the UI. (guarded by mLock) - private final DispatchEventQueue mUiDispatchEventQueue = new DispatchEventQueue(); - private final TouchStream mUiTouchStream = new TouchStream(); - private final UiCallbacks mUiCallbacks; - private final UiHandler mUiHandler; - private boolean mUiDispatchScheduled; - - // Give up on web kit handling of input events when this timeout expires. - private static final long WEBKIT_TIMEOUT_MILLIS = 200; - private static final int TAP_TIMEOUT = ViewConfiguration.getTapTimeout(); - private static final int LONG_PRESS_TIMEOUT = - ViewConfiguration.getLongPressTimeout() + TAP_TIMEOUT; - private static final int DOUBLE_TAP_TIMEOUT = ViewConfiguration.getDoubleTapTimeout(); - private static final int PRESSED_STATE_DURATION = ViewConfiguration.getPressedStateDuration(); - - /** - * Event type: Indicates a touch event type. - * - * This event is delivered together with a {@link MotionEvent} with one of the - * following actions: {@link MotionEvent#ACTION_DOWN}, {@link MotionEvent#ACTION_MOVE}, - * {@link MotionEvent#ACTION_UP}, {@link MotionEvent#ACTION_POINTER_DOWN}, - * {@link MotionEvent#ACTION_POINTER_UP}, {@link MotionEvent#ACTION_CANCEL}. - */ - public static final int EVENT_TYPE_TOUCH = 0; - - /** - * Event type: Indicates a hover event type. - * - * This event is delivered together with a {@link MotionEvent} with one of the - * following actions: {@link MotionEvent#ACTION_HOVER_ENTER}, - * {@link MotionEvent#ACTION_HOVER_MOVE}, {@link MotionEvent#ACTION_HOVER_MOVE}. - */ - public static final int EVENT_TYPE_HOVER = 1; - - /** - * Event type: Indicates a scroll event type. - * - * This event is delivered together with a {@link MotionEvent} with action - * {@link MotionEvent#ACTION_SCROLL}. - */ - public static final int EVENT_TYPE_SCROLL = 2; - - /** - * Event type: Indicates a long-press event type. - * - * This event is delivered in the middle of a sequence of {@link #EVENT_TYPE_TOUCH} events. - * It includes a {@link MotionEvent} with action {@link MotionEvent#ACTION_MOVE} - * that indicates the current touch coordinates of the long-press. - * - * This event is sent when the current touch gesture has been held longer than - * the long-press interval. - */ - public static final int EVENT_TYPE_LONG_PRESS = 3; - - /** - * Event type: Indicates a click event type. - * - * This event is delivered after a sequence of {@link #EVENT_TYPE_TOUCH} events that - * comprise a complete gesture ending with {@link MotionEvent#ACTION_UP}. - * It includes a {@link MotionEvent} with action {@link MotionEvent#ACTION_UP} - * that indicates the location of the click. - * - * This event is sent shortly after the end of a touch after the double-tap - * interval has expired to indicate a click. - */ - public static final int EVENT_TYPE_CLICK = 4; - - /** - * Event type: Indicates a double-tap event type. - * - * This event is delivered after a sequence of {@link #EVENT_TYPE_TOUCH} events that - * comprise a complete gesture ending with {@link MotionEvent#ACTION_UP}. - * It includes a {@link MotionEvent} with action {@link MotionEvent#ACTION_UP} - * that indicates the location of the double-tap. - * - * This event is sent immediately after a sequence of two touches separated - * in time by no more than the double-tap interval and separated in space - * by no more than the double-tap slop. - */ - public static final int EVENT_TYPE_DOUBLE_TAP = 5; - - /** - * Event type: Indicates that a hit test should be performed - */ - public static final int EVENT_TYPE_HIT_TEST = 6; - - /** - * Flag: This event is private to this queue. Do not forward it. - */ - public static final int FLAG_PRIVATE = 1 << 0; - - /** - * Flag: This event is currently being processed by web kit. - * If a timeout occurs, make a copy of it before forwarding the event to another queue. - */ - public static final int FLAG_WEBKIT_IN_PROGRESS = 1 << 1; - - /** - * Flag: A timeout occurred while waiting for web kit to process this input event. - */ - public static final int FLAG_WEBKIT_TIMEOUT = 1 << 2; - - /** - * Flag: Indicates that the event was transformed for delivery to web kit. - * The event must be transformed back before being delivered to the UI. - */ - public static final int FLAG_WEBKIT_TRANSFORMED_EVENT = 1 << 3; - - public WebViewInputDispatcher(UiCallbacks uiCallbacks, WebKitCallbacks webKitCallbacks) { - this.mUiCallbacks = uiCallbacks; - mUiHandler = new UiHandler(uiCallbacks.getUiLooper()); - - this.mWebKitCallbacks = webKitCallbacks; - mWebKitHandler = new WebKitHandler(webKitCallbacks.getWebKitLooper()); - - ViewConfiguration config = ViewConfiguration.get(mUiCallbacks.getContext()); - mDoubleTapSlopSquared = config.getScaledDoubleTapSlop(); - mDoubleTapSlopSquared = (mDoubleTapSlopSquared * mDoubleTapSlopSquared); - mTouchSlopSquared = config.getScaledTouchSlop(); - mTouchSlopSquared = (mTouchSlopSquared * mTouchSlopSquared); - } - - /** - * Sets whether web kit wants to receive touch events. - * - * @param enable True to enable dispatching of touch events to web kit, otherwise - * web kit will be skipped. - */ - public void setWebKitWantsTouchEvents(boolean enable) { - if (DEBUG) { - Log.d(TAG, "webkitWantsTouchEvents: " + enable); - } - synchronized (mLock) { - if (mPostSendTouchEventsToWebKit != enable) { - if (!enable) { - enqueueWebKitCancelTouchEventIfNeededLocked(); - } - mPostSendTouchEventsToWebKit = enable; - } - } - } - - /** - * Posts a pointer event to the dispatch queue. - * - * @param event The event to post. - * @param webKitXOffset X offset to apply to events before dispatching them to web kit. - * @param webKitYOffset Y offset to apply to events before dispatching them to web kit. - * @param webKitScale The scale factor to apply to translated events before dispatching - * them to web kit. - * @return True if the dispatcher will handle the event, false if the event is unsupported. - */ - public boolean postPointerEvent(MotionEvent event, - int webKitXOffset, int webKitYOffset, float webKitScale) { - if (event == null) { - throw new IllegalArgumentException("event cannot be null"); - } - - if (DEBUG) { - Log.d(TAG, "postPointerEvent: " + event); - } - - final int action = event.getActionMasked(); - final int eventType; - switch (action) { - case MotionEvent.ACTION_DOWN: - case MotionEvent.ACTION_MOVE: - case MotionEvent.ACTION_UP: - case MotionEvent.ACTION_POINTER_DOWN: - case MotionEvent.ACTION_POINTER_UP: - case MotionEvent.ACTION_CANCEL: - eventType = EVENT_TYPE_TOUCH; - break; - case MotionEvent.ACTION_SCROLL: - eventType = EVENT_TYPE_SCROLL; - break; - case MotionEvent.ACTION_HOVER_ENTER: - case MotionEvent.ACTION_HOVER_MOVE: - case MotionEvent.ACTION_HOVER_EXIT: - eventType = EVENT_TYPE_HOVER; - break; - default: - return false; // currently unsupported event type - } - - synchronized (mLock) { - // Ensure that the event is consistent and should be delivered. - MotionEvent eventToEnqueue = event; - if (eventType == EVENT_TYPE_TOUCH) { - eventToEnqueue = mPostTouchStream.update(event); - if (eventToEnqueue == null) { - if (DEBUG) { - Log.d(TAG, "postPointerEvent: dropped event " + event); - } - unscheduleLongPressLocked(); - unscheduleClickLocked(); - hideTapCandidateLocked(); - return false; - } - - if (action == MotionEvent.ACTION_DOWN && mPostSendTouchEventsToWebKit) { - if (mUiCallbacks.shouldInterceptTouchEvent(eventToEnqueue)) { - mPostDoNotSendTouchEventsToWebKitUntilNextGesture = true; - } else if (mPostDoNotSendTouchEventsToWebKitUntilNextGesture) { - // Recover from a previous web kit timeout. - mPostDoNotSendTouchEventsToWebKitUntilNextGesture = false; - } - } - } - - // Copy the event because we need to retain ownership. - if (eventToEnqueue == event) { - eventToEnqueue = event.copy(); - } - - DispatchEvent d = obtainDispatchEventLocked(eventToEnqueue, eventType, 0, - webKitXOffset, webKitYOffset, webKitScale); - updateStateTrackersLocked(d, event); - enqueueEventLocked(d); - } - return true; - } - - private void scheduleLongPressLocked() { - unscheduleLongPressLocked(); - mPostLongPressScheduled = true; - mUiHandler.sendEmptyMessageDelayed(UiHandler.MSG_LONG_PRESS, - LONG_PRESS_TIMEOUT); - } - - private void unscheduleLongPressLocked() { - if (mPostLongPressScheduled) { - mPostLongPressScheduled = false; - mUiHandler.removeMessages(UiHandler.MSG_LONG_PRESS); - } - } - - private void postLongPress() { - synchronized (mLock) { - if (!mPostLongPressScheduled) { - return; - } - mPostLongPressScheduled = false; - - MotionEvent event = mPostTouchStream.getLastEvent(); - if (event == null) { - return; - } - - switch (event.getActionMasked()) { - case MotionEvent.ACTION_DOWN: - case MotionEvent.ACTION_MOVE: - case MotionEvent.ACTION_POINTER_DOWN: - case MotionEvent.ACTION_POINTER_UP: - break; - default: - return; - } - - MotionEvent eventToEnqueue = MotionEvent.obtainNoHistory(event); - eventToEnqueue.setAction(MotionEvent.ACTION_MOVE); - DispatchEvent d = obtainDispatchEventLocked(eventToEnqueue, EVENT_TYPE_LONG_PRESS, 0, - mPostLastWebKitXOffset, mPostLastWebKitYOffset, mPostLastWebKitScale); - enqueueEventLocked(d); - } - } - - private void hideTapCandidateLocked() { - unscheduleHideTapHighlightLocked(); - unscheduleShowTapHighlightLocked(); - mUiCallbacks.showTapHighlight(false); - } - - private void showTapCandidateLocked() { - unscheduleHideTapHighlightLocked(); - unscheduleShowTapHighlightLocked(); - mUiCallbacks.showTapHighlight(true); - } - - private void scheduleShowTapHighlightLocked() { - unscheduleShowTapHighlightLocked(); - mPostShowTapHighlightScheduled = true; - mUiHandler.sendEmptyMessageDelayed(UiHandler.MSG_SHOW_TAP_HIGHLIGHT, - TAP_TIMEOUT); - } - - private void unscheduleShowTapHighlightLocked() { - if (mPostShowTapHighlightScheduled) { - mPostShowTapHighlightScheduled = false; - mUiHandler.removeMessages(UiHandler.MSG_SHOW_TAP_HIGHLIGHT); - } - } - - private void scheduleHideTapHighlightLocked() { - unscheduleHideTapHighlightLocked(); - mPostHideTapHighlightScheduled = true; - mUiHandler.sendEmptyMessageDelayed(UiHandler.MSG_HIDE_TAP_HIGHLIGHT, - PRESSED_STATE_DURATION); - } - - private void unscheduleHideTapHighlightLocked() { - if (mPostHideTapHighlightScheduled) { - mPostHideTapHighlightScheduled = false; - mUiHandler.removeMessages(UiHandler.MSG_HIDE_TAP_HIGHLIGHT); - } - } - - private void postShowTapHighlight(boolean show) { - synchronized (mLock) { - if (show) { - if (!mPostShowTapHighlightScheduled) { - return; - } - mPostShowTapHighlightScheduled = false; - } else { - if (!mPostHideTapHighlightScheduled) { - return; - } - mPostHideTapHighlightScheduled = false; - } - mUiCallbacks.showTapHighlight(show); - } - } - - private void scheduleClickLocked() { - unscheduleClickLocked(); - mPostClickScheduled = true; - mUiHandler.sendEmptyMessageDelayed(UiHandler.MSG_CLICK, DOUBLE_TAP_TIMEOUT); - } - - private void unscheduleClickLocked() { - if (mPostClickScheduled) { - mPostClickScheduled = false; - mUiHandler.removeMessages(UiHandler.MSG_CLICK); - } - } - - private void postClick() { - synchronized (mLock) { - if (!mPostClickScheduled) { - return; - } - mPostClickScheduled = false; - - MotionEvent event = mPostTouchStream.getLastEvent(); - if (event == null || event.getAction() != MotionEvent.ACTION_UP) { - return; - } - - showTapCandidateLocked(); - MotionEvent eventToEnqueue = MotionEvent.obtainNoHistory(event); - DispatchEvent d = obtainDispatchEventLocked(eventToEnqueue, EVENT_TYPE_CLICK, 0, - mPostLastWebKitXOffset, mPostLastWebKitYOffset, mPostLastWebKitScale); - enqueueEventLocked(d); - } - } - - private void checkForDoubleTapOnDownLocked(MotionEvent event) { - mIsDoubleTapCandidate = false; - if (!mPostClickScheduled) { - return; - } - int deltaX = (int) mInitialDownX - (int) event.getX(); - int deltaY = (int) mInitialDownY - (int) event.getY(); - if ((deltaX * deltaX + deltaY * deltaY) < mDoubleTapSlopSquared) { - unscheduleClickLocked(); - mIsDoubleTapCandidate = true; - } - } - - private boolean isClickCandidateLocked(MotionEvent event) { - if (event == null - || event.getActionMasked() != MotionEvent.ACTION_UP - || !mIsTapCandidate) { - return false; - } - long downDuration = event.getEventTime() - event.getDownTime(); - return downDuration < LONG_PRESS_TIMEOUT; - } - - private void enqueueDoubleTapLocked(MotionEvent event) { - MotionEvent eventToEnqueue = MotionEvent.obtainNoHistory(event); - DispatchEvent d = obtainDispatchEventLocked(eventToEnqueue, EVENT_TYPE_DOUBLE_TAP, 0, - mPostLastWebKitXOffset, mPostLastWebKitYOffset, mPostLastWebKitScale); - enqueueEventLocked(d); - } - - private void enqueueHitTestLocked(MotionEvent event) { - mUiCallbacks.clearPreviousHitTest(); - MotionEvent eventToEnqueue = MotionEvent.obtainNoHistory(event); - DispatchEvent d = obtainDispatchEventLocked(eventToEnqueue, EVENT_TYPE_HIT_TEST, 0, - mPostLastWebKitXOffset, mPostLastWebKitYOffset, mPostLastWebKitScale); - enqueueEventLocked(d); - } - - private void checkForSlopLocked(MotionEvent event) { - if (!mIsTapCandidate) { - return; - } - int deltaX = (int) mInitialDownX - (int) event.getX(); - int deltaY = (int) mInitialDownY - (int) event.getY(); - if ((deltaX * deltaX + deltaY * deltaY) > mTouchSlopSquared) { - unscheduleLongPressLocked(); - mIsTapCandidate = false; - hideTapCandidateLocked(); - } - } - - private void updateStateTrackersLocked(DispatchEvent d, MotionEvent event) { - mPostLastWebKitXOffset = d.mWebKitXOffset; - mPostLastWebKitYOffset = d.mWebKitYOffset; - mPostLastWebKitScale = d.mWebKitScale; - int action = event != null ? event.getAction() : MotionEvent.ACTION_CANCEL; - if (d.mEventType != EVENT_TYPE_TOUCH) { - return; - } - - if (action == MotionEvent.ACTION_CANCEL - || event.getPointerCount() > 1) { - unscheduleLongPressLocked(); - unscheduleClickLocked(); - hideTapCandidateLocked(); - mIsDoubleTapCandidate = false; - mIsTapCandidate = false; - hideTapCandidateLocked(); - } else if (action == MotionEvent.ACTION_DOWN) { - checkForDoubleTapOnDownLocked(event); - scheduleLongPressLocked(); - mIsTapCandidate = true; - mInitialDownX = event.getX(); - mInitialDownY = event.getY(); - enqueueHitTestLocked(event); - if (mIsDoubleTapCandidate) { - hideTapCandidateLocked(); - } else { - scheduleShowTapHighlightLocked(); - } - } else if (action == MotionEvent.ACTION_UP) { - unscheduleLongPressLocked(); - if (isClickCandidateLocked(event)) { - if (mIsDoubleTapCandidate) { - hideTapCandidateLocked(); - enqueueDoubleTapLocked(event); - } else { - scheduleClickLocked(); - } - } else { - hideTapCandidateLocked(); - } - } else if (action == MotionEvent.ACTION_MOVE) { - checkForSlopLocked(event); - } - } - - /** - * Dispatches pending web kit events. - * Must only be called from the web kit thread. - * - * This method may be used to flush the queue of pending input events - * immediately. This method may help to reduce input dispatch latency - * if called before certain expensive operations such as drawing. - */ - public void dispatchWebKitEvents() { - dispatchWebKitEvents(false); - } - - private void dispatchWebKitEvents(boolean calledFromHandler) { - for (;;) { - // Get the next event, but leave it in the queue so we can move it to the UI - // queue if a timeout occurs. - DispatchEvent d; - MotionEvent event; - final int eventType; - int flags; - synchronized (mLock) { - if (!ENABLE_EVENT_BATCHING) { - drainStaleWebKitEventsLocked(); - } - d = mWebKitDispatchEventQueue.mHead; - if (d == null) { - if (mWebKitDispatchScheduled) { - mWebKitDispatchScheduled = false; - if (!calledFromHandler) { - mWebKitHandler.removeMessages( - WebKitHandler.MSG_DISPATCH_WEBKIT_EVENTS); - } - } - return; - } - - event = d.mEvent; - if (event != null) { - event.offsetLocation(d.mWebKitXOffset, d.mWebKitYOffset); - event.scale(d.mWebKitScale); - d.mFlags |= FLAG_WEBKIT_TRANSFORMED_EVENT; - } - - eventType = d.mEventType; - if (eventType == EVENT_TYPE_TOUCH) { - event = mWebKitTouchStream.update(event); - if (DEBUG && event == null && d.mEvent != null) { - Log.d(TAG, "dispatchWebKitEvents: dropped event " + d.mEvent); - } - } - - d.mFlags |= FLAG_WEBKIT_IN_PROGRESS; - flags = d.mFlags; - } - - // Handle the event. - final boolean preventDefault; - if (event == null) { - preventDefault = false; - } else { - preventDefault = dispatchWebKitEvent(event, eventType, flags); - } - - synchronized (mLock) { - flags = d.mFlags; - d.mFlags = flags & ~FLAG_WEBKIT_IN_PROGRESS; - boolean recycleEvent = event != d.mEvent; - - if ((flags & FLAG_WEBKIT_TIMEOUT) != 0) { - // A timeout occurred! - recycleDispatchEventLocked(d); - } else { - // Web kit finished in a timely manner. Dequeue the event. - assert mWebKitDispatchEventQueue.mHead == d; - mWebKitDispatchEventQueue.dequeue(); - - updateWebKitTimeoutLocked(); - - if ((flags & FLAG_PRIVATE) != 0) { - // Event was intended for web kit only. All done. - recycleDispatchEventLocked(d); - } else if (preventDefault) { - // Web kit has decided to consume the event! - if (d.mEventType == EVENT_TYPE_TOUCH) { - enqueueUiCancelTouchEventIfNeededLocked(); - unscheduleLongPressLocked(); - } - } else { - // Web kit is being friendly. Pass the event to the UI. - enqueueUiEventUnbatchedLocked(d); - } - } - - if (event != null && recycleEvent) { - event.recycle(); - } - - if (eventType == EVENT_TYPE_CLICK) { - scheduleHideTapHighlightLocked(); - } - } - } - } - - // Runs on web kit thread. - private boolean dispatchWebKitEvent(MotionEvent event, int eventType, int flags) { - if (DEBUG) { - Log.d(TAG, "dispatchWebKitEvent: event=" + event - + ", eventType=" + eventType + ", flags=" + flags); - } - boolean preventDefault = mWebKitCallbacks.dispatchWebKitEvent( - this, event, eventType, flags); - if (DEBUG) { - Log.d(TAG, "dispatchWebKitEvent: preventDefault=" + preventDefault); - } - return preventDefault; - } - - private boolean isMoveEventLocked(DispatchEvent d) { - return d.mEvent != null - && d.mEvent.getActionMasked() == MotionEvent.ACTION_MOVE; - } - - private void drainStaleWebKitEventsLocked() { - DispatchEvent d = mWebKitDispatchEventQueue.mHead; - while (d != null && d.mNext != null - && isMoveEventLocked(d) - && isMoveEventLocked(d.mNext)) { - DispatchEvent next = d.mNext; - skipWebKitEventLocked(d); - d = next; - } - mWebKitDispatchEventQueue.mHead = d; - } - - // Called by WebKit when it doesn't care about the rest of the touch stream - public void skipWebkitForRemainingTouchStream() { - // Just treat this like a timeout - handleWebKitTimeout(); - } - - // Runs on UI thread in response to the web kit thread appearing to be unresponsive. - private void handleWebKitTimeout() { - synchronized (mLock) { - if (!mWebKitTimeoutScheduled) { - return; - } - mWebKitTimeoutScheduled = false; - - if (DEBUG) { - Log.d(TAG, "handleWebKitTimeout: timeout occurred!"); - } - - // Drain the web kit event queue. - DispatchEvent d = mWebKitDispatchEventQueue.dequeueList(); - - // If web kit was processing an event (must be at the head of the list because - // it can only do one at a time), then clone it or ignore it. - if ((d.mFlags & FLAG_WEBKIT_IN_PROGRESS) != 0) { - d.mFlags |= FLAG_WEBKIT_TIMEOUT; - if ((d.mFlags & FLAG_PRIVATE) != 0) { - d = d.mNext; // the event is private to web kit, ignore it - } else { - d = copyDispatchEventLocked(d); - d.mFlags &= ~FLAG_WEBKIT_IN_PROGRESS; - } - } - - // Enqueue all non-private events for handling by the UI thread. - while (d != null) { - DispatchEvent next = d.mNext; - skipWebKitEventLocked(d); - d = next; - } - - // Tell web kit to cancel all pending touches. - // This also prevents us from sending web kit any more touches until the - // next gesture begins. (As required to ensure touch event stream consistency.) - enqueueWebKitCancelTouchEventIfNeededLocked(); - } - } - - private void skipWebKitEventLocked(DispatchEvent d) { - d.mNext = null; - if ((d.mFlags & FLAG_PRIVATE) != 0) { - recycleDispatchEventLocked(d); - } else { - d.mFlags |= FLAG_WEBKIT_TIMEOUT; - enqueueUiEventUnbatchedLocked(d); - } - } - - /** - * Dispatches pending UI events. - * Must only be called from the UI thread. - * - * This method may be used to flush the queue of pending input events - * immediately. This method may help to reduce input dispatch latency - * if called before certain expensive operations such as drawing. - */ - public void dispatchUiEvents() { - dispatchUiEvents(false); - } - - private void dispatchUiEvents(boolean calledFromHandler) { - for (;;) { - MotionEvent event; - final int eventType; - final int flags; - synchronized (mLock) { - DispatchEvent d = mUiDispatchEventQueue.dequeue(); - if (d == null) { - if (mUiDispatchScheduled) { - mUiDispatchScheduled = false; - if (!calledFromHandler) { - mUiHandler.removeMessages(UiHandler.MSG_DISPATCH_UI_EVENTS); - } - } - return; - } - - event = d.mEvent; - if (event != null && (d.mFlags & FLAG_WEBKIT_TRANSFORMED_EVENT) != 0) { - event.scale(1.0f / d.mWebKitScale); - event.offsetLocation(-d.mWebKitXOffset, -d.mWebKitYOffset); - d.mFlags &= ~FLAG_WEBKIT_TRANSFORMED_EVENT; - } - - eventType = d.mEventType; - if (eventType == EVENT_TYPE_TOUCH) { - event = mUiTouchStream.update(event); - if (DEBUG && event == null && d.mEvent != null) { - Log.d(TAG, "dispatchUiEvents: dropped event " + d.mEvent); - } - } - - flags = d.mFlags; - - if (event == d.mEvent) { - d.mEvent = null; // retain ownership of event, don't recycle it yet - } - recycleDispatchEventLocked(d); - - if (eventType == EVENT_TYPE_CLICK) { - scheduleHideTapHighlightLocked(); - } - } - - // Handle the event. - if (event != null) { - dispatchUiEvent(event, eventType, flags); - event.recycle(); - } - } - } - - // Runs on UI thread. - private void dispatchUiEvent(MotionEvent event, int eventType, int flags) { - if (DEBUG) { - Log.d(TAG, "dispatchUiEvent: event=" + event - + ", eventType=" + eventType + ", flags=" + flags); - } - mUiCallbacks.dispatchUiEvent(event, eventType, flags); - } - - private void enqueueEventLocked(DispatchEvent d) { - if (!shouldSkipWebKit(d)) { - enqueueWebKitEventLocked(d); - } else { - enqueueUiEventLocked(d); - } - } - - private boolean shouldSkipWebKit(DispatchEvent d) { - switch (d.mEventType) { - case EVENT_TYPE_CLICK: - case EVENT_TYPE_HOVER: - case EVENT_TYPE_SCROLL: - case EVENT_TYPE_HIT_TEST: - return false; - case EVENT_TYPE_TOUCH: - // TODO: This should be cleaned up. We now have WebViewInputDispatcher - // and WebViewClassic both checking for slop and doing their own - // thing - they should be consolidated. And by consolidated, I mean - // WebViewClassic's version should just be deleted. - // The reason this is done is because webpages seem to expect - // that they only get an ontouchmove if the slop has been exceeded. - if (mIsTapCandidate && d.mEvent != null - && d.mEvent.getActionMasked() == MotionEvent.ACTION_MOVE) { - return true; - } - return !mPostSendTouchEventsToWebKit - || mPostDoNotSendTouchEventsToWebKitUntilNextGesture; - } - return true; - } - - private void enqueueWebKitCancelTouchEventIfNeededLocked() { - // We want to cancel touch events that were delivered to web kit. - // Enqueue a null event at the end of the queue if needed. - if (mWebKitTouchStream.isCancelNeeded() || !mWebKitDispatchEventQueue.isEmpty()) { - DispatchEvent d = obtainDispatchEventLocked(null, EVENT_TYPE_TOUCH, FLAG_PRIVATE, - 0, 0, 1.0f); - enqueueWebKitEventUnbatchedLocked(d); - mPostDoNotSendTouchEventsToWebKitUntilNextGesture = true; - } - } - - private void enqueueWebKitEventLocked(DispatchEvent d) { - if (batchEventLocked(d, mWebKitDispatchEventQueue.mTail)) { - if (DEBUG) { - Log.d(TAG, "enqueueWebKitEventLocked: batched event " + d.mEvent); - } - recycleDispatchEventLocked(d); - } else { - enqueueWebKitEventUnbatchedLocked(d); - } - } - - private void enqueueWebKitEventUnbatchedLocked(DispatchEvent d) { - if (DEBUG) { - Log.d(TAG, "enqueueWebKitEventUnbatchedLocked: enqueued event " + d.mEvent); - } - mWebKitDispatchEventQueue.enqueue(d); - scheduleWebKitDispatchLocked(); - updateWebKitTimeoutLocked(); - } - - private void scheduleWebKitDispatchLocked() { - if (!mWebKitDispatchScheduled) { - mWebKitHandler.sendEmptyMessage(WebKitHandler.MSG_DISPATCH_WEBKIT_EVENTS); - mWebKitDispatchScheduled = true; - } - } - - private void updateWebKitTimeoutLocked() { - DispatchEvent d = mWebKitDispatchEventQueue.mHead; - if (d != null && mWebKitTimeoutScheduled && mWebKitTimeoutTime == d.mTimeoutTime) { - return; - } - if (mWebKitTimeoutScheduled) { - mUiHandler.removeMessages(UiHandler.MSG_WEBKIT_TIMEOUT); - mWebKitTimeoutScheduled = false; - } - if (d != null) { - mUiHandler.sendEmptyMessageAtTime(UiHandler.MSG_WEBKIT_TIMEOUT, d.mTimeoutTime); - mWebKitTimeoutScheduled = true; - mWebKitTimeoutTime = d.mTimeoutTime; - } - } - - private void enqueueUiCancelTouchEventIfNeededLocked() { - // We want to cancel touch events that were delivered to the UI. - // Enqueue a null event at the end of the queue if needed. - if (mUiTouchStream.isCancelNeeded() || !mUiDispatchEventQueue.isEmpty()) { - DispatchEvent d = obtainDispatchEventLocked(null, EVENT_TYPE_TOUCH, FLAG_PRIVATE, - 0, 0, 1.0f); - enqueueUiEventUnbatchedLocked(d); - } - } - - private void enqueueUiEventLocked(DispatchEvent d) { - if (batchEventLocked(d, mUiDispatchEventQueue.mTail)) { - if (DEBUG) { - Log.d(TAG, "enqueueUiEventLocked: batched event " + d.mEvent); - } - recycleDispatchEventLocked(d); - } else { - enqueueUiEventUnbatchedLocked(d); - } - } - - private void enqueueUiEventUnbatchedLocked(DispatchEvent d) { - if (DEBUG) { - Log.d(TAG, "enqueueUiEventUnbatchedLocked: enqueued event " + d.mEvent); - } - mUiDispatchEventQueue.enqueue(d); - scheduleUiDispatchLocked(); - } - - private void scheduleUiDispatchLocked() { - if (!mUiDispatchScheduled) { - mUiHandler.sendEmptyMessage(UiHandler.MSG_DISPATCH_UI_EVENTS); - mUiDispatchScheduled = true; - } - } - - private boolean batchEventLocked(DispatchEvent in, DispatchEvent tail) { - if (!ENABLE_EVENT_BATCHING) { - return false; - } - if (tail != null && tail.mEvent != null && in.mEvent != null - && in.mEventType == tail.mEventType - && in.mFlags == tail.mFlags - && in.mWebKitXOffset == tail.mWebKitXOffset - && in.mWebKitYOffset == tail.mWebKitYOffset - && in.mWebKitScale == tail.mWebKitScale) { - return tail.mEvent.addBatch(in.mEvent); - } - return false; - } - - private DispatchEvent obtainDispatchEventLocked(MotionEvent event, - int eventType, int flags, int webKitXOffset, int webKitYOffset, float webKitScale) { - DispatchEvent d = obtainUninitializedDispatchEventLocked(); - d.mEvent = event; - d.mEventType = eventType; - d.mFlags = flags; - d.mTimeoutTime = SystemClock.uptimeMillis() + WEBKIT_TIMEOUT_MILLIS; - d.mWebKitXOffset = webKitXOffset; - d.mWebKitYOffset = webKitYOffset; - d.mWebKitScale = webKitScale; - if (DEBUG) { - Log.d(TAG, "Timeout time: " + (d.mTimeoutTime - SystemClock.uptimeMillis())); - } - return d; - } - - private DispatchEvent copyDispatchEventLocked(DispatchEvent d) { - DispatchEvent copy = obtainUninitializedDispatchEventLocked(); - if (d.mEvent != null) { - copy.mEvent = d.mEvent.copy(); - } - copy.mEventType = d.mEventType; - copy.mFlags = d.mFlags; - copy.mTimeoutTime = d.mTimeoutTime; - copy.mWebKitXOffset = d.mWebKitXOffset; - copy.mWebKitYOffset = d.mWebKitYOffset; - copy.mWebKitScale = d.mWebKitScale; - copy.mNext = d.mNext; - return copy; - } - - private DispatchEvent obtainUninitializedDispatchEventLocked() { - DispatchEvent d = mDispatchEventPool; - if (d != null) { - mDispatchEventPoolSize -= 1; - mDispatchEventPool = d.mNext; - d.mNext = null; - } else { - d = new DispatchEvent(); - } - return d; - } - - private void recycleDispatchEventLocked(DispatchEvent d) { - if (d.mEvent != null) { - d.mEvent.recycle(); - d.mEvent = null; - } - - if (mDispatchEventPoolSize < MAX_DISPATCH_EVENT_POOL_SIZE) { - mDispatchEventPoolSize += 1; - d.mNext = mDispatchEventPool; - mDispatchEventPool = d; - } - } - - /* Implemented by {@link WebViewClassic} to perform operations on the UI thread. */ - public static interface UiCallbacks { - /** - * Gets the UI thread's looper. - * @return The looper. - */ - public Looper getUiLooper(); - - /** - * Gets the UI's context - * @return The context - */ - public Context getContext(); - - /** - * Dispatches an event to the UI. - * @param event The event. - * @param eventType The event type. - * @param flags The event's dispatch flags. - */ - public void dispatchUiEvent(MotionEvent event, int eventType, int flags); - - /** - * Asks the UI thread whether this touch event stream should be - * intercepted based on the touch down event. - * @param event The touch down event. - * @return true if the UI stream wants the touch stream without going - * through webkit or false otherwise. - */ - public boolean shouldInterceptTouchEvent(MotionEvent event); - - /** - * Inform's the UI that it should show the tap highlight - * @param show True if it should show the highlight, false if it should hide it - */ - public void showTapHighlight(boolean show); - - /** - * Called when we are sending a new EVENT_TYPE_HIT_TEST to WebKit, so - * previous hit tests should be cleared as they are obsolete. - */ - public void clearPreviousHitTest(); - } - - /* Implemented by {@link WebViewCore} to perform operations on the web kit thread. */ - public static interface WebKitCallbacks { - /** - * Gets the web kit thread's looper. - * @return The looper. - */ - public Looper getWebKitLooper(); - - /** - * Dispatches an event to web kit. - * @param dispatcher The WebViewInputDispatcher sending the event - * @param event The event. - * @param eventType The event type. - * @param flags The event's dispatch flags. - * @return True if web kit wants to prevent default event handling. - */ - public boolean dispatchWebKitEvent(WebViewInputDispatcher dispatcher, - MotionEvent event, int eventType, int flags); - } - - // Runs on UI thread. - private final class UiHandler extends Handler { - public static final int MSG_DISPATCH_UI_EVENTS = 1; - public static final int MSG_WEBKIT_TIMEOUT = 2; - public static final int MSG_LONG_PRESS = 3; - public static final int MSG_CLICK = 4; - public static final int MSG_SHOW_TAP_HIGHLIGHT = 5; - public static final int MSG_HIDE_TAP_HIGHLIGHT = 6; - - public UiHandler(Looper looper) { - super(looper); - } - - @Override - public void handleMessage(Message msg) { - switch (msg.what) { - case MSG_DISPATCH_UI_EVENTS: - dispatchUiEvents(true); - break; - case MSG_WEBKIT_TIMEOUT: - handleWebKitTimeout(); - break; - case MSG_LONG_PRESS: - postLongPress(); - break; - case MSG_CLICK: - postClick(); - break; - case MSG_SHOW_TAP_HIGHLIGHT: - postShowTapHighlight(true); - break; - case MSG_HIDE_TAP_HIGHLIGHT: - postShowTapHighlight(false); - break; - default: - throw new IllegalStateException("Unknown message type: " + msg.what); - } - } - } - - // Runs on web kit thread. - private final class WebKitHandler extends Handler { - public static final int MSG_DISPATCH_WEBKIT_EVENTS = 1; - - public WebKitHandler(Looper looper) { - super(looper); - } - - @Override - public void handleMessage(Message msg) { - switch (msg.what) { - case MSG_DISPATCH_WEBKIT_EVENTS: - dispatchWebKitEvents(true); - break; - default: - throw new IllegalStateException("Unknown message type: " + msg.what); - } - } - } - - private static final class DispatchEvent { - public DispatchEvent mNext; - - public MotionEvent mEvent; - public int mEventType; - public int mFlags; - public long mTimeoutTime; - public int mWebKitXOffset; - public int mWebKitYOffset; - public float mWebKitScale; - } - - private static final class DispatchEventQueue { - public DispatchEvent mHead; - public DispatchEvent mTail; - - public boolean isEmpty() { - return mHead != null; - } - - public void enqueue(DispatchEvent d) { - if (mHead == null) { - mHead = d; - mTail = d; - } else { - mTail.mNext = d; - mTail = d; - } - } - - public DispatchEvent dequeue() { - DispatchEvent d = mHead; - if (d != null) { - DispatchEvent next = d.mNext; - if (next == null) { - mHead = null; - mTail = null; - } else { - mHead = next; - d.mNext = null; - } - } - return d; - } - - public DispatchEvent dequeueList() { - DispatchEvent d = mHead; - if (d != null) { - mHead = null; - mTail = null; - } - return d; - } - } - - /** - * Keeps track of a stream of touch events so that we can discard touch - * events that would make the stream inconsistent. - */ - private static final class TouchStream { - private MotionEvent mLastEvent; - - /** - * Gets the last touch event that was delivered. - * @return The last touch event, or null if none. - */ - public MotionEvent getLastEvent() { - return mLastEvent; - } - - /** - * Updates the touch event stream. - * @param event The event that we intend to send, or null to cancel the - * touch event stream. - * @return The event that we should actually send, or null if no event should - * be sent because the proposed event would make the stream inconsistent. - */ - public MotionEvent update(MotionEvent event) { - if (event == null) { - if (isCancelNeeded()) { - event = mLastEvent; - if (event != null) { - event.setAction(MotionEvent.ACTION_CANCEL); - mLastEvent = null; - } - } - return event; - } - - switch (event.getActionMasked()) { - case MotionEvent.ACTION_MOVE: - case MotionEvent.ACTION_UP: - case MotionEvent.ACTION_POINTER_DOWN: - case MotionEvent.ACTION_POINTER_UP: - if (mLastEvent == null - || mLastEvent.getAction() == MotionEvent.ACTION_UP) { - return null; - } - updateLastEvent(event); - return event; - - case MotionEvent.ACTION_DOWN: - updateLastEvent(event); - return event; - - case MotionEvent.ACTION_CANCEL: - if (mLastEvent == null) { - return null; - } - updateLastEvent(null); - return event; - - default: - return null; - } - } - - /** - * Returns true if there is a gesture in progress that may need to be canceled. - * @return True if cancel is needed. - */ - public boolean isCancelNeeded() { - return mLastEvent != null && mLastEvent.getAction() != MotionEvent.ACTION_UP; - } - - private void updateLastEvent(MotionEvent event) { - if (mLastEvent != null) { - mLastEvent.recycle(); - } - mLastEvent = event != null ? MotionEvent.obtainNoHistory(event) : null; - } - } -}
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