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Unified Diff: content/public/android/java/src/org/chromium/content/browser/ContentViewGestureHandler.java

Issue 141533006: [Android] Move the java content/ package to content_public/ to start the split. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Small fixes and findbugs line update Created 6 years, 11 months ago
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Index: content/public/android/java/src/org/chromium/content/browser/ContentViewGestureHandler.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewGestureHandler.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewGestureHandler.java
deleted file mode 100644
index 6d03fcaddb31f3956b9b26b91091ec588242243e..0000000000000000000000000000000000000000
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewGestureHandler.java
+++ /dev/null
@@ -1,1294 +0,0 @@
-// Copyright 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.content.browser;
-
-import android.content.Context;
-import android.os.Bundle;
-import android.os.SystemClock;
-import android.util.Log;
-import android.view.InputDevice;
-import android.view.MotionEvent;
-import android.view.ViewConfiguration;
-
-import org.chromium.base.CommandLine;
-import org.chromium.base.TraceEvent;
-import org.chromium.content.browser.LongPressDetector.LongPressDelegate;
-import org.chromium.content.browser.third_party.GestureDetector;
-import org.chromium.content.browser.third_party.GestureDetector.OnDoubleTapListener;
-import org.chromium.content.browser.third_party.GestureDetector.OnGestureListener;
-import org.chromium.content.common.ContentSwitches;
-
-import java.util.ArrayDeque;
-import java.util.Deque;
-
-/**
- * This class handles all MotionEvent handling done in ContentViewCore including the gesture
- * recognition. It sends all related native calls through the interface MotionEventDelegate.
- */
-class ContentViewGestureHandler implements LongPressDelegate {
-
- private static final String TAG = "ContentViewGestureHandler";
- /**
- * Used for GESTURE_FLING_START x velocity
- */
- static final String VELOCITY_X = "Velocity X";
- /**
- * Used for GESTURE_FLING_START y velocity
- */
- static final String VELOCITY_Y = "Velocity Y";
- /**
- * Used for GESTURE_SCROLL_BY x distance (scroll offset of update)
- */
- static final String DISTANCE_X = "Distance X";
- /**
- * Used for GESTURE_SCROLL_BY y distance (scroll offset of update)
- */
- static final String DISTANCE_Y = "Distance Y";
- /**
- * Used for GESTURE_SCROLL_START delta X hint (movement triggering scroll)
- */
- static final String DELTA_HINT_X = "Delta Hint X";
- /**
- * Used for GESTURE_SCROLL_START delta Y hint (movement triggering scroll)
- */
- static final String DELTA_HINT_Y = "Delta Hint Y";
- /**
- * Used in GESTURE_SINGLE_TAP_CONFIRMED to check whether ShowPress has been called before.
- */
- static final String SHOW_PRESS = "ShowPress";
- /**
- * Used for GESTURE_PINCH_BY delta
- */
- static final String DELTA = "Delta";
-
- /**
- * Used by UMA stat for tracking accidental double tap navigations. Specifies the amount of
- * time after a double tap within which actions will be recorded to the UMA stat.
- */
- private static final long ACTION_AFTER_DOUBLE_TAP_WINDOW_MS = 5000;
-
- private final Bundle mExtraParamBundleSingleTap;
- private final Bundle mExtraParamBundleFling;
- private final Bundle mExtraParamBundleScroll;
- private final Bundle mExtraParamBundleScrollStart;
- private final Bundle mExtraParamBundleDoubleTapDragZoom;
- private final Bundle mExtraParamBundlePinchBy;
- private GestureDetector mGestureDetector;
- private final ZoomManager mZoomManager;
- private LongPressDetector mLongPressDetector;
- private OnGestureListener mListener;
- private OnDoubleTapListener mDoubleTapListener;
- private MotionEvent mCurrentDownEvent;
- private final MotionEventDelegate mMotionEventDelegate;
-
- // Queue of motion events.
- private final Deque<MotionEvent> mPendingMotionEvents = new ArrayDeque<MotionEvent>();
-
- // All events are forwarded to the GestureDetector, bypassing Javascript.
- private static final int NO_TOUCH_HANDLER = 0;
-
- // All events are forwarded as normal to Javascript, and if unconsumed to the GestureDetector.
- // * Activated from the renderer by way of |hasTouchEventHandlers(true)|.
- private static final int HAS_TOUCH_HANDLER = 1;
-
- // Events in the current gesture are forwarded to the GestureDetector, bypassing Javascript.
- // * Activated if the touch down for the current gesture had no Javascript consumer.
- private static final int NO_TOUCH_HANDLER_FOR_GESTURE = 2;
-
- // Events in the current gesture are forwarded to Javascript, and not to the GestureDetector.
- // * Activated if *any* touch event in the current sequence was consumed by Javascript.
- private static final int JAVASCRIPT_CONSUMING_GESTURE = 3;
-
- private static final int TOUCH_HANDLING_STATE_DEFAULT = NO_TOUCH_HANDLER;
-
- private int mTouchHandlingState = TOUCH_HANDLING_STATE_DEFAULT;
-
- // Remember whether onShowPress() is called. If it is not, in onSingleTapConfirmed()
- // we will first show the press state, then trigger the click.
- private boolean mShowPressIsCalled;
-
- // Whether a sent GESTURE_TAP_DOWN event has yet to be accompanied by a corresponding
- // GESTURE_SINGLE_TAP_UP, GESTURE_SINGLE_TAP_CONFIRMED, GESTURE_TAP_CANCEL or
- // GESTURE_DOUBLE_TAP.
- private boolean mNeedsTapEndingEvent;
-
- // This flag is used for ignoring the remaining touch events, i.e., All the events until the
- // next ACTION_DOWN. This is automatically set to false on the next ACTION_DOWN.
- private boolean mIgnoreRemainingTouchEvents;
-
- // TODO(klobag): this is to avoid a bug in GestureDetector. With multi-touch,
- // mAlwaysInTapRegion is not reset. So when the last finger is up, onSingleTapUp()
- // will be mistakenly fired.
- private boolean mIgnoreSingleTap;
-
- // True from right before we send the first scroll event until the last finger is raised.
- private boolean mTouchScrolling;
-
- // TODO(wangxianzhu): For now it is true after a fling is started until the next
- // touch. Should reset it to false on end of fling if the UI is able to know when the
- // fling ends.
- private boolean mFlingMayBeActive;
-
- // Used to remove the touch slop from the initial scroll event in a scroll gesture.
- private boolean mSeenFirstScrollEvent;
-
- private boolean mPinchInProgress = false;
-
- // Guard against nested |trySendPendingEventsToNative()| loops.
- private boolean mSendingPendingEventsToNative = false;
-
- private static final int DOUBLE_TAP_TIMEOUT = ViewConfiguration.getDoubleTapTimeout();
-
- //On single tap this will store the x, y coordinates of the touch.
- private int mSingleTapX;
- private int mSingleTapY;
-
- // Indicate current double tap mode state.
- private int mDoubleTapMode = DOUBLE_TAP_MODE_NONE;
-
- // x, y coordinates for an Anchor on double tap drag zoom.
- private float mDoubleTapDragZoomAnchorX;
- private float mDoubleTapDragZoomAnchorY;
-
- // On double tap this will store the y coordinates of the touch.
- private float mDoubleTapY;
-
- // Double tap drag zoom sensitive (speed).
- private static final float DOUBLE_TAP_DRAG_ZOOM_SPEED = 0.005f;
-
- // Used to track the last rawX/Y coordinates for moves. This gives absolute scroll distance.
- // Useful for full screen tracking.
- private float mLastRawX = 0;
- private float mLastRawY = 0;
-
- // Cache of square of the scaled touch slop so we don't have to calculate it on every touch.
- private int mScaledTouchSlopSquare;
-
- // Object that keeps track of and updates scroll snapping behavior.
- private final SnapScrollController mSnapScrollController;
-
- // Used to track the accumulated scroll error over time. This is used to remove the
- // rounding error we introduced by passing integers to webkit.
- private float mAccumulatedScrollErrorX = 0;
- private float mAccumulatedScrollErrorY = 0;
-
- // The page's viewport and scale sometimes allow us to disable double tap gesture detection,
- // according to the logic in ContentViewCore.onRenderCoordinatesUpdated().
- private boolean mShouldDisableDoubleTap;
-
- // Keeps track of the last long press event, if we end up opening a context menu, we would need
- // to potentially use the event to send GESTURE_TAP_CANCEL to remove ::active styling
- private MotionEvent mLastLongPressEvent;
-
- // Whether the click delay should always be disabled by sending clicks for double tap gestures.
- private final boolean mDisableClickDelay;
-
- // Used for tracking UMA ActionAfterDoubleTap to tell user's immediate
- // action after a double tap.
- private long mLastDoubleTapTimeMs;
-
- // Coordinates of the start of a touch sequence offered to native (i.e. the touchdown).
- private float mTouchDownToNativeX;
- private float mTouchDownToNativeY;
-
- // True iff a (potential) touchmove offered to native has exceeded the touch slop distance
- // OR it had multiple pointers.
- private boolean mTouchMoveToNativeConfirmed;
-
- static final int GESTURE_SHOW_PRESSED_STATE = 0;
- static final int GESTURE_DOUBLE_TAP = 1;
- static final int GESTURE_SINGLE_TAP_UP = 2;
- static final int GESTURE_SINGLE_TAP_CONFIRMED = 3;
- static final int GESTURE_SINGLE_TAP_UNCONFIRMED = 4;
- static final int GESTURE_LONG_PRESS = 5;
- static final int GESTURE_SCROLL_START = 6;
- static final int GESTURE_SCROLL_BY = 7;
- static final int GESTURE_SCROLL_END = 8;
- static final int GESTURE_FLING_START = 9;
- static final int GESTURE_FLING_CANCEL = 10;
- static final int GESTURE_PINCH_BEGIN = 11;
- static final int GESTURE_PINCH_BY = 12;
- static final int GESTURE_PINCH_END = 13;
- static final int GESTURE_TAP_CANCEL = 14;
- static final int GESTURE_LONG_TAP = 15;
- static final int GESTURE_TAP_DOWN = 16;
-
- // These have to be kept in sync with content/port/common/input_event_ack_state.h
- static final int INPUT_EVENT_ACK_STATE_UNKNOWN = 0;
- static final int INPUT_EVENT_ACK_STATE_CONSUMED = 1;
- static final int INPUT_EVENT_ACK_STATE_NOT_CONSUMED = 2;
- static final int INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS = 3;
- static final int INPUT_EVENT_ACK_STATE_IGNORED = 4;
-
- // Return values of sendPendingEventToNative();
- static final int EVENT_FORWARDED_TO_NATIVE = 0;
- static final int EVENT_DROPPED = 1;
- static final int EVENT_NOT_FORWARDED = 2;
-
- private final float mPxToDp;
-
- static final int DOUBLE_TAP_MODE_NONE = 0;
- static final int DOUBLE_TAP_MODE_DRAG_DETECTION_IN_PROGRESS = 1;
- static final int DOUBLE_TAP_MODE_DRAG_ZOOM = 2;
- static final int DOUBLE_TAP_MODE_DISABLED = 3;
-
- /**
- * This is an interface to handle MotionEvent related communication with the native side also
- * access some ContentView specific parameters.
- */
- public interface MotionEventDelegate {
- /**
- * Send a raw {@link MotionEvent} to the native side
- * @param timeMs Time of the event in ms.
- * @param action The action type for the event.
- * @param pts The TouchPoint array to be sent for the event.
- * @return Whether the event was sent to the native side successfully or not.
- */
- public boolean sendTouchEvent(long timeMs, int action, TouchPoint[] pts);
-
- /**
- * Send a gesture event to the native side.
- * @param type The type of the gesture event.
- * @param timeMs The time the gesture event occurred at.
- * @param x The x location for the gesture event.
- * @param y The y location for the gesture event.
- * @param extraParams A bundle that holds specific extra parameters for certain gestures.
- * This is read-only and should not be modified in this function.
- * Refer to gesture type definition for more information.
- * @return Whether the gesture was sent successfully.
- */
- boolean sendGesture(int type, long timeMs, int x, int y, Bundle extraParams);
-
- /**
- * Show the zoom picker UI.
- */
- public void invokeZoomPicker();
-
- /**
- * Send action after dobule tap for UMA stat tracking.
- * @param type The action that occured
- * @param clickDelayEnabled Whether the tap down delay is active
- */
- public void sendActionAfterDoubleTapUMA(int type, boolean clickDelayEnabled);
-
- /**
- * Send single tap UMA.
- * @param type The tap type: delayed or undelayed
- */
- public void sendSingleTapUMA(int type);
- }
-
- ContentViewGestureHandler(
- Context context, MotionEventDelegate delegate, ZoomManager zoomManager) {
- mExtraParamBundleSingleTap = new Bundle();
- mExtraParamBundleFling = new Bundle();
- mExtraParamBundleScroll = new Bundle();
- mExtraParamBundleScrollStart = new Bundle();
- mExtraParamBundleDoubleTapDragZoom = new Bundle();
- mExtraParamBundlePinchBy = new Bundle();
-
- mLongPressDetector = new LongPressDetector(context, this);
- mMotionEventDelegate = delegate;
- mZoomManager = zoomManager;
- mSnapScrollController = new SnapScrollController(context, mZoomManager);
- mPxToDp = 1.0f / context.getResources().getDisplayMetrics().density;
-
- mDisableClickDelay = CommandLine.isInitialized() &&
- CommandLine.getInstance().hasSwitch(ContentSwitches.DISABLE_CLICK_DELAY);
-
- initGestureDetectors(context);
- }
-
- /**
- * Used to override the default long press detector, gesture detector and listener.
- * This is used for testing only.
- * @param longPressDetector The new LongPressDetector to be assigned.
- * @param gestureDetector The new GestureDetector to be assigned.
- * @param listener The new onGestureListener to be assigned.
- */
- void setTestDependencies(
- LongPressDetector longPressDetector, GestureDetector gestureDetector,
- OnGestureListener listener) {
- if (longPressDetector != null) mLongPressDetector = longPressDetector;
- if (gestureDetector != null) mGestureDetector = gestureDetector;
- if (listener != null) mListener = listener;
- }
-
- private void initGestureDetectors(final Context context) {
- final int scaledTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
- mScaledTouchSlopSquare = scaledTouchSlop * scaledTouchSlop;
- try {
- TraceEvent.begin();
- GestureDetector.SimpleOnGestureListener listener =
- new GestureDetector.SimpleOnGestureListener() {
- @Override
- public boolean onDown(MotionEvent e) {
- mShowPressIsCalled = false;
- mIgnoreSingleTap = false;
- mTouchScrolling = false;
- mSeenFirstScrollEvent = false;
- mLastRawX = e.getRawX();
- mLastRawY = e.getRawY();
- mAccumulatedScrollErrorX = 0;
- mAccumulatedScrollErrorY = 0;
- mNeedsTapEndingEvent = false;
- if (sendMotionEventAsGesture(GESTURE_TAP_DOWN, e, null)) {
- mNeedsTapEndingEvent = true;
- }
- // Return true to indicate that we want to handle touch
- return true;
- }
-
- @Override
- public boolean onScroll(MotionEvent e1, MotionEvent e2,
- float rawDistanceX, float rawDistanceY) {
- assert e1.getEventTime() <= e2.getEventTime();
- float distanceX = rawDistanceX;
- float distanceY = rawDistanceY;
- if (!mSeenFirstScrollEvent) {
- // Remove the touch slop region from the first scroll event to avoid a
- // jump.
- mSeenFirstScrollEvent = true;
- double distance = Math.sqrt(
- distanceX * distanceX + distanceY * distanceY);
- double epsilon = 1e-3;
- if (distance > epsilon) {
- double ratio = Math.max(0, distance - scaledTouchSlop) / distance;
- distanceX *= ratio;
- distanceY *= ratio;
- }
- }
- mSnapScrollController.updateSnapScrollMode(distanceX, distanceY);
- if (mSnapScrollController.isSnappingScrolls()) {
- if (mSnapScrollController.isSnapHorizontal()) {
- distanceY = 0;
- } else {
- distanceX = 0;
- }
- }
-
- mLastRawX = e2.getRawX();
- mLastRawY = e2.getRawY();
- if (!mTouchScrolling) {
- sendTapCancelIfNecessary(e1);
- endFlingIfNecessary(e2.getEventTime());
- // Note that scroll start hints are in distance traveled, where
- // scroll deltas are in the opposite direction.
- mExtraParamBundleScrollStart.putInt(DELTA_HINT_X, (int) -rawDistanceX);
- mExtraParamBundleScrollStart.putInt(DELTA_HINT_Y, (int) -rawDistanceY);
- assert mExtraParamBundleScrollStart.size() == 2;
- if (sendGesture(GESTURE_SCROLL_START, e2.getEventTime(),
- (int) e1.getX(), (int) e1.getY(),
- mExtraParamBundleScrollStart)) {
- mTouchScrolling = true;
- }
- }
-
- // distanceX and distanceY is the scrolling offset since last onScroll.
- // Because we are passing integers to webkit, this could introduce
- // rounding errors. The rounding errors will accumulate overtime.
- // To solve this, we should be adding back the rounding errors each time
- // when we calculate the new offset.
- int x = (int) e2.getX();
- int y = (int) e2.getY();
- int dx = (int) (distanceX + mAccumulatedScrollErrorX);
- int dy = (int) (distanceY + mAccumulatedScrollErrorY);
- mAccumulatedScrollErrorX = distanceX + mAccumulatedScrollErrorX - dx;
- mAccumulatedScrollErrorY = distanceY + mAccumulatedScrollErrorY - dy;
-
- mExtraParamBundleScroll.putInt(DISTANCE_X, dx);
- mExtraParamBundleScroll.putInt(DISTANCE_Y, dy);
- assert mExtraParamBundleScroll.size() == 2;
-
- if ((dx | dy) != 0) {
- sendGesture(GESTURE_SCROLL_BY,
- e2.getEventTime(), x, y, mExtraParamBundleScroll);
- }
-
- mMotionEventDelegate.invokeZoomPicker();
-
- return true;
- }
-
- @Override
- public boolean onFling(MotionEvent e1, MotionEvent e2,
- float velocityX, float velocityY) {
- assert e1.getEventTime() <= e2.getEventTime();
- if (mSnapScrollController.isSnappingScrolls()) {
- if (mSnapScrollController.isSnapHorizontal()) {
- velocityY = 0;
- } else {
- velocityX = 0;
- }
- }
-
- fling(e2.getEventTime(), (int) e1.getX(0), (int) e1.getY(0),
- (int) velocityX, (int) velocityY);
- return true;
- }
-
- @Override
- public void onShowPress(MotionEvent e) {
- mShowPressIsCalled = true;
- sendMotionEventAsGesture(GESTURE_SHOW_PRESSED_STATE, e, null);
- }
-
- @Override
- public boolean onSingleTapUp(MotionEvent e) {
- if (isDistanceBetweenDownAndUpTooLong(e.getRawX(), e.getRawY())) {
- sendTapCancelIfNecessary(e);
- mIgnoreSingleTap = true;
- return true;
- }
- // This is a hack to address the issue where user hovers
- // over a link for longer than DOUBLE_TAP_TIMEOUT, then
- // onSingleTapConfirmed() is not triggered. But we still
- // want to trigger the tap event at UP. So we override
- // onSingleTapUp() in this case. This assumes singleTapUp
- // gets always called before singleTapConfirmed.
- if (!mIgnoreSingleTap && !mLongPressDetector.isInLongPress()) {
- if (e.getEventTime() - e.getDownTime() > DOUBLE_TAP_TIMEOUT) {
- float x = e.getX();
- float y = e.getY();
- if (sendTapEndingEventAsGesture(GESTURE_SINGLE_TAP_UP, e, null)) {
- mIgnoreSingleTap = true;
- }
- setClickXAndY((int) x, (int) y);
-
- mMotionEventDelegate.sendSingleTapUMA(
- isDoubleTapDisabled() ?
- ContentViewCore.UMASingleTapType.UNDELAYED_TAP :
- ContentViewCore.UMASingleTapType.DELAYED_TAP);
-
- return true;
- } else if (isDoubleTapDisabled() || mDisableClickDelay) {
- // If double tap has been disabled, there is no need to wait
- // for the double tap timeout.
- return onSingleTapConfirmed(e);
- } else {
- // Notify Blink about this tapUp event anyway,
- // when none of the above conditions applied.
- sendMotionEventAsGesture(GESTURE_SINGLE_TAP_UNCONFIRMED, e, null);
- }
- }
-
- return triggerLongTapIfNeeded(e);
- }
-
- @Override
- public boolean onSingleTapConfirmed(MotionEvent e) {
- // Long taps in the edges of the screen have their events delayed by
- // ContentViewHolder for tab swipe operations. As a consequence of the delay
- // this method might be called after receiving the up event.
- // These corner cases should be ignored.
- if (mLongPressDetector.isInLongPress() || mIgnoreSingleTap) return true;
-
- mMotionEventDelegate.sendSingleTapUMA(
- isDoubleTapDisabled() ?
- ContentViewCore.UMASingleTapType.UNDELAYED_TAP :
- ContentViewCore.UMASingleTapType.DELAYED_TAP);
-
- int x = (int) e.getX();
- int y = (int) e.getY();
- mExtraParamBundleSingleTap.putBoolean(SHOW_PRESS, mShowPressIsCalled);
- assert mExtraParamBundleSingleTap.size() == 1;
- if (sendTapEndingEventAsGesture(GESTURE_SINGLE_TAP_CONFIRMED, e,
- mExtraParamBundleSingleTap)) {
- mIgnoreSingleTap = true;
- }
-
- setClickXAndY(x, y);
- return true;
- }
-
- @Override
- public boolean onDoubleTapEvent(MotionEvent e) {
- switch (e.getActionMasked()) {
- case MotionEvent.ACTION_DOWN:
- sendTapCancelIfNecessary(e);
- mDoubleTapDragZoomAnchorX = e.getX();
- mDoubleTapDragZoomAnchorY = e.getY();
- mDoubleTapMode = DOUBLE_TAP_MODE_DRAG_DETECTION_IN_PROGRESS;
- break;
- case MotionEvent.ACTION_MOVE:
- if (mDoubleTapMode
- == DOUBLE_TAP_MODE_DRAG_DETECTION_IN_PROGRESS) {
- float distanceX = mDoubleTapDragZoomAnchorX - e.getX();
- float distanceY = mDoubleTapDragZoomAnchorY - e.getY();
-
- // Begin double tap drag zoom mode if the move distance is
- // further than the threshold.
- if (isDistanceGreaterThanTouchSlop(distanceX, distanceY)) {
- sendTapCancelIfNecessary(e);
- mExtraParamBundleScrollStart.putInt(DELTA_HINT_X,
- (int) -distanceX);
- mExtraParamBundleScrollStart.putInt(DELTA_HINT_Y,
- (int) -distanceY);
- assert mExtraParamBundleScrollStart.size() == 2;
- sendGesture(GESTURE_SCROLL_START, e.getEventTime(),
- (int) e.getX(), (int) e.getY(),
- mExtraParamBundleScrollStart);
- pinchBegin(e.getEventTime(),
- Math.round(mDoubleTapDragZoomAnchorX),
- Math.round(mDoubleTapDragZoomAnchorY));
- mDoubleTapMode = DOUBLE_TAP_MODE_DRAG_ZOOM;
- }
- } else if (mDoubleTapMode == DOUBLE_TAP_MODE_DRAG_ZOOM) {
- assert mExtraParamBundleDoubleTapDragZoom.isEmpty();
- sendGesture(GESTURE_SCROLL_BY, e.getEventTime(),
- (int) e.getX(), (int) e.getY(),
- mExtraParamBundleDoubleTapDragZoom);
-
- float dy = mDoubleTapY - e.getY();
- pinchBy(e.getEventTime(),
- Math.round(mDoubleTapDragZoomAnchorX),
- Math.round(mDoubleTapDragZoomAnchorY),
- (float) Math.pow(dy > 0 ?
- 1.0f - DOUBLE_TAP_DRAG_ZOOM_SPEED :
- 1.0f + DOUBLE_TAP_DRAG_ZOOM_SPEED,
- Math.abs(dy * mPxToDp)));
- }
- break;
- case MotionEvent.ACTION_UP:
- if (mDoubleTapMode != DOUBLE_TAP_MODE_DRAG_ZOOM) {
- // Normal double tap gesture.
- sendTapEndingEventAsGesture(GESTURE_DOUBLE_TAP, e, null);
- }
- endDoubleTapDragIfNecessary(e);
- break;
- case MotionEvent.ACTION_CANCEL:
- sendTapCancelIfNecessary(e);
- endDoubleTapDragIfNecessary(e);
- break;
- default:
- break;
- }
- mDoubleTapY = e.getY();
- return true;
- }
-
- @Override
- public void onLongPress(MotionEvent e) {
- if (!mZoomManager.isScaleGestureDetectionInProgress() &&
- (mDoubleTapMode == DOUBLE_TAP_MODE_NONE ||
- isDoubleTapDisabled())) {
- mLastLongPressEvent = e;
- sendMotionEventAsGesture(GESTURE_LONG_PRESS, e, null);
- }
- }
-
- /**
- * This method inspects the distance between where the user started touching
- * the surface, and where she released. If the points are too far apart, we
- * should assume that the web page has consumed the scroll-events in-between,
- * and as such, this should not be considered a single-tap.
- *
- * We use the Android frameworks notion of how far a touch can wander before
- * we think the user is scrolling.
- *
- * @param x the new x coordinate
- * @param y the new y coordinate
- * @return true if the distance is too long to be considered a single tap
- */
- private boolean isDistanceBetweenDownAndUpTooLong(float x, float y) {
- return isDistanceGreaterThanTouchSlop(mLastRawX - x, mLastRawY - y);
- }
- };
- mListener = listener;
- mDoubleTapListener = listener;
- mGestureDetector = new GestureDetector(context, listener);
- mGestureDetector.setIsLongpressEnabled(false);
- } finally {
- TraceEvent.end();
- }
- }
-
- /**
- * @return LongPressDetector handling setting up timers for and canceling LongPress gestures.
- */
- LongPressDetector getLongPressDetector() {
- return mLongPressDetector;
- }
-
- /**
- * @param event Start a LongPress gesture event from the listener.
- */
- @Override
- public void onLongPress(MotionEvent event) {
- mListener.onLongPress(event);
- }
-
- /**
- * Cancels any ongoing LongPress timers.
- */
- void cancelLongPress() {
- mLongPressDetector.cancelLongPress();
- }
-
- /**
- * Fling the ContentView from the current position.
- * @param x Fling touch starting position
- * @param y Fling touch starting position
- * @param velocityX Initial velocity of the fling (X) measured in pixels per second.
- * @param velocityY Initial velocity of the fling (Y) measured in pixels per second.
- */
- void fling(long timeMs, int x, int y, int velocityX, int velocityY) {
- endFlingIfNecessary(timeMs);
-
- if (velocityX == 0 && velocityY == 0) {
- endTouchScrollIfNecessary(timeMs, true);
- return;
- }
-
- if (!mTouchScrolling) {
- // The native side needs a GESTURE_SCROLL_BEGIN before GESTURE_FLING_START
- // to send the fling to the correct target. Send if it has not sent.
- // The distance traveled in one second is a reasonable scroll start hint.
- mExtraParamBundleScrollStart.putInt(DELTA_HINT_X, velocityX);
- mExtraParamBundleScrollStart.putInt(DELTA_HINT_Y, velocityY);
- assert mExtraParamBundleScrollStart.size() == 2;
- sendGesture(GESTURE_SCROLL_START, timeMs, x, y, mExtraParamBundleScrollStart);
- }
- endTouchScrollIfNecessary(timeMs, false);
-
- mFlingMayBeActive = true;
-
- mExtraParamBundleFling.putInt(VELOCITY_X, velocityX);
- mExtraParamBundleFling.putInt(VELOCITY_Y, velocityY);
- assert mExtraParamBundleFling.size() == 2;
- sendGesture(GESTURE_FLING_START, timeMs, x, y, mExtraParamBundleFling);
- }
-
- /**
- * Send a GESTURE_FLING_CANCEL event if necessary.
- * @param timeMs The time in ms for the event initiating this gesture.
- */
- void endFlingIfNecessary(long timeMs) {
- if (!mFlingMayBeActive) return;
- mFlingMayBeActive = false;
- sendGesture(GESTURE_FLING_CANCEL, timeMs, 0, 0, null);
- }
-
- /**
- * End DOUBLE_TAP_MODE_DRAG_ZOOM by sending GESTURE_SCROLL_END and GESTURE_PINCH_END events.
- * @param event A hint event that its x, y, and eventTime will be used for the ending events
- * to send. This argument is an optional and can be null.
- */
- void endDoubleTapDragIfNecessary(MotionEvent event) {
- assert event != null;
- if (!isDoubleTapActive()) return;
- if (mDoubleTapMode == DOUBLE_TAP_MODE_DRAG_ZOOM) {
- pinchEnd(event.getEventTime());
- sendGesture(GESTURE_SCROLL_END, event.getEventTime(),
- (int) event.getX(), (int) event.getY(), null);
- }
- mDoubleTapMode = DOUBLE_TAP_MODE_NONE;
- updateDoubleTapListener();
- }
-
- /**
- * Reset touch scroll flag and optionally send a GESTURE_SCROLL_END event if necessary.
- * @param timeMs The time in ms for the event initiating this gesture.
- * @param sendScrollEndEvent Whether to send GESTURE_SCROLL_END event.
- */
- private void endTouchScrollIfNecessary(long timeMs, boolean sendScrollEndEvent) {
- if (!mTouchScrolling) return;
- mTouchScrolling = false;
- if (sendScrollEndEvent) {
- sendGesture(GESTURE_SCROLL_END, timeMs, 0, 0, null);
- }
- }
-
- /**
- * @return Whether native is tracking a scroll.
- */
- boolean isNativeScrolling() {
- // TODO(wangxianzhu): Also return true when fling is active once the UI knows exactly when
- // the fling ends.
- return mTouchScrolling;
- }
-
- /**
- * @return Whether native is tracking a pinch (i.e. between sending GESTURE_PINCH_BEGIN and
- * GESTURE_PINCH_END).
- */
- boolean isNativePinching() {
- return mPinchInProgress;
- }
-
- /**
- * Starts a pinch gesture.
- * @param timeMs The time in ms for the event initiating this gesture.
- * @param x The x coordinate for the event initiating this gesture.
- * @param y The x coordinate for the event initiating this gesture.
- */
- void pinchBegin(long timeMs, int x, int y) {
- sendGesture(GESTURE_PINCH_BEGIN, timeMs, x, y, null);
- }
-
- /**
- * Pinch by a given percentage.
- * @param timeMs The time in ms for the event initiating this gesture.
- * @param anchorX The x coordinate for the anchor point to be used in pinch.
- * @param anchorY The y coordinate for the anchor point to be used in pinch.
- * @param delta The percentage to pinch by.
- */
- void pinchBy(long timeMs, int anchorX, int anchorY, float delta) {
- mExtraParamBundlePinchBy.putFloat(DELTA, delta);
- assert mExtraParamBundlePinchBy.size() == 1;
- sendGesture(GESTURE_PINCH_BY, timeMs, anchorX, anchorY, mExtraParamBundlePinchBy);
- mPinchInProgress = true;
- }
-
- /**
- * End a pinch gesture.
- * @param timeMs The time in ms for the event initiating this gesture.
- */
- void pinchEnd(long timeMs) {
- sendGesture(GESTURE_PINCH_END, timeMs, 0, 0, null);
- mPinchInProgress = false;
- }
-
- /**
- * Ignore singleTap gestures.
- */
- void setIgnoreSingleTap(boolean value) {
- mIgnoreSingleTap = value;
- }
-
- private void setClickXAndY(int x, int y) {
- mSingleTapX = x;
- mSingleTapY = y;
- }
-
- /**
- * @return The x coordinate for the last point that a singleTap gesture was initiated from.
- */
- public int getSingleTapX() {
- return mSingleTapX;
- }
-
- /**
- * @return The y coordinate for the last point that a singleTap gesture was initiated from.
- */
- public int getSingleTapY() {
- return mSingleTapY;
- }
-
- /**
- * Cancel the current touch event sequence by sending ACTION_CANCEL and ignore all the
- * subsequent events until the next ACTION_DOWN.
- *
- * One example usecase is stop processing the touch events when showing context popup menu.
- */
- public void setIgnoreRemainingTouchEvents() {
- onTouchEvent(obtainActionCancelMotionEvent());
- mIgnoreRemainingTouchEvents = true;
- }
-
- /**
- * Handle the incoming MotionEvent.
- * @return Whether the event was handled.
- */
- boolean onTouchEvent(MotionEvent event) {
- try {
- TraceEvent.begin("onTouchEvent");
-
- if (mIgnoreRemainingTouchEvents) {
- if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
- mIgnoreRemainingTouchEvents = false;
- } else {
- return false;
- }
- }
-
- mLongPressDetector.cancelLongPressIfNeeded(event);
- // Notify native that scrolling has stopped whenever a down action is processed prior to
- // passing the event to native as it will drop them as an optimization if scrolling is
- // enabled. Ending the fling ensures scrolling has stopped as well as terminating the
- // current fling if applicable.
- if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
- endFlingIfNecessary(event.getEventTime());
- }
-
- return queueEvent(event);
- } finally {
- TraceEvent.end("onTouchEvent");
- }
- }
-
- /**
- * Handle content view losing focus -- ensure that any remaining active state is removed.
- */
- void onWindowFocusLost() {
- if (mLongPressDetector.isInLongPress() && mLastLongPressEvent != null) {
- sendTapCancelIfNecessary(mLastLongPressEvent);
- }
- }
-
- private MotionEvent obtainActionCancelMotionEvent() {
- MotionEvent me = MotionEvent.obtain(
- SystemClock.uptimeMillis(),
- SystemClock.uptimeMillis(),
- MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0);
- me.setSource(mCurrentDownEvent != null ?
- mCurrentDownEvent.getSource() : InputDevice.SOURCE_CLASS_POINTER);
- return me;
- }
-
- /**
- * Resets gesture handlers state; called on didStartLoading().
- * Note that this does NOT clear the pending motion events queue;
- * it gets cleared in hasTouchEventHandlers() called from WebKit
- * FrameLoader::transitionToCommitted iff the page ever had touch handlers.
- */
- void resetGestureHandlers() {
- MotionEvent me = obtainActionCancelMotionEvent();
- mGestureDetector.onTouchEvent(me);
- mZoomManager.processTouchEvent(me);
- me.recycle();
- mLongPressDetector.cancelLongPress();
- if (mCurrentDownEvent != null) recycleEvent(mCurrentDownEvent);
- mCurrentDownEvent = null;
- }
-
- /**
- * Sets the flag indicating that the content has registered listeners for touch events.
- */
- void hasTouchEventHandlers(boolean hasTouchHandlers) {
- if (hasTouchHandlers) {
- // If no touch handler was previously registered, ensure that we
- // don't send a partial gesture to Javascript.
- if (mTouchHandlingState == NO_TOUCH_HANDLER)
- mTouchHandlingState = NO_TOUCH_HANDLER_FOR_GESTURE;
- } else {
- // When mainframe is loading, FrameLoader::transitionToCommitted will
- // call this method with |hasTouchHandlers| of false. We use this as
- // an indicator to clear the pending motion events so that events from
- // the previous page will not be carried over to the new page.
- mTouchHandlingState = NO_TOUCH_HANDLER;
- mPendingMotionEvents.clear();
- }
- }
-
- /**
- * Queues or coalesces |event| into the pending queue.
- * - If there are no touch handlers, |event| will skip the queue and be processed immediately.
- * - If there are no pending events, |event| will be sent to native or processed immediately,
- * depending on the disposition of the current gesture sequence.
- * @return Whether the event was queued OR processed.
- */
- private boolean queueEvent(MotionEvent event) {
- if (mTouchHandlingState == NO_TOUCH_HANDLER) {
- assert mPendingMotionEvents.isEmpty();
- return processTouchEvent(event);
- }
-
- if (event.getActionMasked() == MotionEvent.ACTION_MOVE) {
- // Avoid flooding the renderer process with move events: if the previous pending
- // command is also a move (common case) that has not yet been forwarded, skip sending
- // this event to the webkit side and collapse it into the pending event.
- MotionEvent previousEvent = mPendingMotionEvents.peekLast();
- if (previousEvent != null
- && previousEvent != mPendingMotionEvents.peekFirst()
- && previousEvent.getActionMasked() == MotionEvent.ACTION_MOVE
- && previousEvent.getPointerCount() == event.getPointerCount()) {
- TraceEvent.instant("queueEvent:EventCoalesced",
- "QueueSize = " + mPendingMotionEvents.size());
- MotionEvent.PointerCoords[] coords =
- new MotionEvent.PointerCoords[event.getPointerCount()];
- for (int i = 0; i < coords.length; ++i) {
- coords[i] = new MotionEvent.PointerCoords();
- event.getPointerCoords(i, coords[i]);
- }
- previousEvent.addBatch(event.getEventTime(), coords, event.getMetaState());
- return true;
- }
- }
-
- // Copy the event, as the original may get mutated after this method returns.
- MotionEvent clone = MotionEvent.obtain(event);
- mPendingMotionEvents.add(clone);
- if (mPendingMotionEvents.size() == 1) {
- trySendPendingEventsToNative();
- } else {
- TraceEvent.instant("queueEvent:EventQueued",
- "QueueSize = " + mPendingMotionEvents.size());
- }
- return true;
- }
-
- private int sendPendingEventToNative() {
- MotionEvent event = mPendingMotionEvents.peekFirst();
- if (event == null) {
- assert false : "Cannot send from an empty pending event queue";
- return EVENT_NOT_FORWARDED;
- }
- assert mTouchHandlingState != NO_TOUCH_HANDLER;
-
- // The start of a new (multi)touch sequence will reset the touch handling state, and
- // should always be offered to Javascript (when there is any touch handler).
- if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
- mTouchHandlingState = HAS_TOUCH_HANDLER;
- mTouchMoveToNativeConfirmed = false;
- mTouchDownToNativeX = event.getX();
- mTouchDownToNativeY = event.getY();
- }
-
- if (mTouchHandlingState == NO_TOUCH_HANDLER_FOR_GESTURE) return EVENT_NOT_FORWARDED;
-
- if (event.getActionMasked() == MotionEvent.ACTION_MOVE) {
- if (!mTouchMoveToNativeConfirmed) {
- if (event.getPointerCount() > 1) {
- mTouchMoveToNativeConfirmed = true;
- } else {
- final float distanceX = event.getX() - mTouchDownToNativeX;
- final float distanceY = event.getY() - mTouchDownToNativeY;
- if (isDistanceGreaterThanTouchSlop(distanceX, distanceY)) {
- mTouchMoveToNativeConfirmed = true;
- }
- }
- }
- // If javascript has not yet prevent-defaulted the touch sequence, only send move events
- // if the move has exceeded the slop threshold OR there are multiple pointers.
- if (mTouchHandlingState != JAVASCRIPT_CONSUMING_GESTURE
- && !mTouchMoveToNativeConfirmed) {
- return EVENT_DROPPED;
- }
- }
-
- TouchPoint[] pts = new TouchPoint[event.getPointerCount()];
- int type = TouchPoint.createTouchPoints(event, pts);
-
- if (type == TouchPoint.CONVERSION_ERROR) return EVENT_NOT_FORWARDED;
-
- if (mMotionEventDelegate.sendTouchEvent(event.getEventTime(), type, pts)) {
- return EVENT_FORWARDED_TO_NATIVE;
- }
- return EVENT_NOT_FORWARDED;
- }
-
- private boolean processTouchEvent(MotionEvent event) {
- final boolean wasTouchScrolling = mTouchScrolling;
-
- mSnapScrollController.setSnapScrollingMode(event);
-
- if (event.getActionMasked() == MotionEvent.ACTION_POINTER_DOWN) {
- endDoubleTapDragIfNecessary(event);
- }
-
- mLongPressDetector.cancelLongPressIfNeeded(event);
- mLongPressDetector.startLongPressTimerIfNeeded(event);
-
- // Use the framework's GestureDetector to detect pans and zooms not already
- // handled by the WebKit touch events gesture manager.
- boolean handled = false;
- if (canHandle(event)) {
- handled |= mGestureDetector.onTouchEvent(event);
- if (event.getAction() == MotionEvent.ACTION_DOWN) {
- mCurrentDownEvent = MotionEvent.obtain(event);
- }
- }
-
- handled |= mZoomManager.processTouchEvent(event);
-
- if (event.getAction() == MotionEvent.ACTION_UP
- || event.getAction() == MotionEvent.ACTION_CANCEL) {
- if (mCurrentDownEvent != null) recycleEvent(mCurrentDownEvent);
- mCurrentDownEvent = null;
-
- // "Last finger raised" could be an end to movement, but it should
- // only terminate scrolling if the event did not cause a fling.
- if (wasTouchScrolling && !handled) {
- endTouchScrollIfNecessary(event.getEventTime(), true);
- }
- }
-
- return handled;
- }
-
- /**
- * Respond to a MotionEvent being returned from the native side.
- * @param ackResult The status acknowledgment code.
- */
- void confirmTouchEvent(int ackResult) {
- try {
- TraceEvent.begin("confirmTouchEvent");
-
- if (mPendingMotionEvents.isEmpty()) {
- Log.w(TAG, "confirmTouchEvent with Empty pending list!");
- return;
- }
- assert mTouchHandlingState != NO_TOUCH_HANDLER;
- assert mTouchHandlingState != NO_TOUCH_HANDLER_FOR_GESTURE;
-
- MotionEvent ackedEvent = mPendingMotionEvents.removeFirst();
- switch (ackResult) {
- case INPUT_EVENT_ACK_STATE_UNKNOWN:
- // This should never get sent.
- assert (false);
- break;
- case INPUT_EVENT_ACK_STATE_CONSUMED:
- case INPUT_EVENT_ACK_STATE_IGNORED:
- if (mTouchHandlingState != JAVASCRIPT_CONSUMING_GESTURE
- && ackedEvent.getActionMasked() != MotionEvent.ACTION_DOWN) {
- sendTapCancelIfNecessary(ackedEvent);
- resetGestureHandlers();
- } else {
- mZoomManager.passTouchEventThrough(ackedEvent);
- }
- mTouchHandlingState = JAVASCRIPT_CONSUMING_GESTURE;
- trySendPendingEventsToNative();
- break;
- case INPUT_EVENT_ACK_STATE_NOT_CONSUMED:
- if (mTouchHandlingState != JAVASCRIPT_CONSUMING_GESTURE) {
- processTouchEvent(ackedEvent);
- }
- trySendPendingEventsToNative();
- break;
- case INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS:
- if (mTouchHandlingState != JAVASCRIPT_CONSUMING_GESTURE) {
- processTouchEvent(ackedEvent);
- }
- if (ackedEvent.getActionMasked() == MotionEvent.ACTION_DOWN) {
- drainAllPendingEventsUntilNextDown();
- } else {
- trySendPendingEventsToNative();
- }
- break;
- default:
- break;
- }
-
- mLongPressDetector.cancelLongPressIfNeeded(mPendingMotionEvents.iterator());
- recycleEvent(ackedEvent);
- } finally {
- TraceEvent.end("confirmTouchEvent");
- }
- }
-
- private void trySendPendingEventsToNative() {
- // Avoid nested send loops (possible when acks are synchronous), instead
- // relying on the top-most call to dispatch any queued events.
- if (mSendingPendingEventsToNative) return;
- try {
- mSendingPendingEventsToNative = true;
- while (!mPendingMotionEvents.isEmpty()) {
- int forward = sendPendingEventToNative();
- if (forward == EVENT_FORWARDED_TO_NATIVE) break;
-
- // Even though we missed sending one event to native, as long as we haven't
- // received INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS, we should keep sending
- // events on the queue to native.
- MotionEvent event = mPendingMotionEvents.removeFirst();
- if (mTouchHandlingState != JAVASCRIPT_CONSUMING_GESTURE
- && forward != EVENT_DROPPED) {
- processTouchEvent(event);
- }
- recycleEvent(event);
- }
- } finally {
- mSendingPendingEventsToNative = false;
- }
- }
-
- private void drainAllPendingEventsUntilNextDown() {
- assert mTouchHandlingState == HAS_TOUCH_HANDLER;
- mTouchHandlingState = NO_TOUCH_HANDLER_FOR_GESTURE;
-
- // Now process all events that are in the queue until the next down event.
- MotionEvent nextEvent = mPendingMotionEvents.peekFirst();
- while (nextEvent != null && nextEvent.getActionMasked() != MotionEvent.ACTION_DOWN) {
- processTouchEvent(nextEvent);
- mPendingMotionEvents.removeFirst();
- recycleEvent(nextEvent);
- nextEvent = mPendingMotionEvents.peekFirst();
- }
-
- trySendPendingEventsToNative();
- }
-
- private void recycleEvent(MotionEvent event) {
- event.recycle();
- }
-
- private boolean sendMotionEventAsGesture(
- int type, MotionEvent event, Bundle extraParams) {
- return sendGesture(type, event.getEventTime(),
- (int) event.getX(), (int) event.getY(), extraParams);
- }
-
- private boolean sendGesture(
- int type, long timeMs, int x, int y, Bundle extraParams) {
- assert timeMs != 0;
- updateDoubleTapUmaTimer();
-
- if (type == GESTURE_DOUBLE_TAP) reportDoubleTap();
-
- return mMotionEventDelegate.sendGesture(type, timeMs, x, y, extraParams);
- }
-
- private boolean sendTapEndingEventAsGesture(int type, MotionEvent e, Bundle extraParams) {
- if (!sendMotionEventAsGesture(type, e, extraParams)) return false;
- mNeedsTapEndingEvent = false;
- return true;
- }
-
- private void sendTapCancelIfNecessary(MotionEvent e) {
- if (!mNeedsTapEndingEvent) return;
- if (!sendTapEndingEventAsGesture(GESTURE_TAP_CANCEL, e, null)) return;
- mLastLongPressEvent = null;
- }
-
- /**
- * @return Whether the ContentViewGestureHandler can handle a MotionEvent right now. True only
- * if it's the start of a new stream (ACTION_DOWN), or a continuation of the current stream.
- */
- boolean canHandle(MotionEvent ev) {
- return ev.getAction() == MotionEvent.ACTION_DOWN ||
- (mCurrentDownEvent != null && mCurrentDownEvent.getDownTime() == ev.getDownTime());
- }
-
- /**
- * @return Whether the event can trigger a LONG_TAP gesture. True when it can and the event
- * will be consumed.
- */
- boolean triggerLongTapIfNeeded(MotionEvent ev) {
- if (mLongPressDetector.isInLongPress() && ev.getAction() == MotionEvent.ACTION_UP &&
- !mZoomManager.isScaleGestureDetectionInProgress()) {
- sendTapCancelIfNecessary(ev);
- sendMotionEventAsGesture(GESTURE_LONG_TAP, ev, null);
- return true;
- }
- return false;
- }
-
- /**
- * This is for testing only.
- * @return The first motion event on the pending motion events queue.
- */
- MotionEvent peekFirstInPendingMotionEventsForTesting() {
- return mPendingMotionEvents.peekFirst();
- }
-
- /**
- * This is for testing only.
- * @return The number of motion events on the pending motion events queue.
- */
- int getNumberOfPendingMotionEventsForTesting() {
- return mPendingMotionEvents.size();
- }
-
- /**
- * This is for testing only.
- * Sends a show pressed state gesture through mListener. This should always be called after
- * a down event;
- */
- void sendShowPressedStateGestureForTesting() {
- if (mCurrentDownEvent == null) return;
- mListener.onShowPress(mCurrentDownEvent);
- }
-
- /**
- * This is for testing only.
- * @return Whether a sent TapDown event has been accompanied by a tap-ending event.
- */
- boolean needsTapEndingEventForTesting() {
- return mNeedsTapEndingEvent;
- }
-
- /**
- * Update whether double-tap gestures are supported. This allows
- * double-tap gesture suppression independent of whether or not the page's
- * viewport and scale would normally prevent double-tap.
- * Note: This should never be called while a double-tap gesture is in progress.
- * @param supportDoubleTap Whether double-tap gestures are supported.
- */
- public void updateDoubleTapSupport(boolean supportDoubleTap) {
- assert !isDoubleTapActive();
- int doubleTapMode = supportDoubleTap ?
- DOUBLE_TAP_MODE_NONE : DOUBLE_TAP_MODE_DISABLED;
- if (mDoubleTapMode == doubleTapMode) return;
- mDoubleTapMode = doubleTapMode;
- updateDoubleTapListener();
- }
-
- /**
- * Update whether double-tap gesture detection should be suppressed due to
- * the viewport or scale of the current page. Suppressing double-tap gesture
- * detection allows for rapid and responsive single-tap gestures.
- * @param shouldDisableDoubleTap Whether double-tap should be suppressed.
- */
- public void updateShouldDisableDoubleTap(boolean shouldDisableDoubleTap) {
- if (mShouldDisableDoubleTap == shouldDisableDoubleTap) return;
- mShouldDisableDoubleTap = shouldDisableDoubleTap;
- updateDoubleTapListener();
- }
-
- private boolean isDoubleTapDisabled() {
- return mDoubleTapMode == DOUBLE_TAP_MODE_DISABLED || mShouldDisableDoubleTap;
- }
-
- private boolean isDoubleTapActive() {
- return mDoubleTapMode != DOUBLE_TAP_MODE_DISABLED &&
- mDoubleTapMode != DOUBLE_TAP_MODE_NONE;
- }
-
- private void updateDoubleTapListener() {
- if (isDoubleTapDisabled()) {
- // Defer nulling the DoubleTapListener until the double tap gesture is complete.
- if (isDoubleTapActive()) return;
- mGestureDetector.setOnDoubleTapListener(null);
- } else {
- mGestureDetector.setOnDoubleTapListener(mDoubleTapListener);
- }
- }
-
- private void reportDoubleTap() {
- // Make sure repeated double taps don't get silently dropped from
- // the statistics.
- if (mLastDoubleTapTimeMs > 0) {
- mMotionEventDelegate.sendActionAfterDoubleTapUMA(
- ContentViewCore.UMAActionAfterDoubleTap.NO_ACTION, !mDisableClickDelay);
- }
-
- mLastDoubleTapTimeMs = SystemClock.uptimeMillis();
- }
-
- /**
- * Update the UMA stat tracking accidental double tap navigations with a user action.
- * @param type The action the user performed, one of the UMAActionAfterDoubleTap values
- * defined in ContentViewCore.
- */
- public void reportActionAfterDoubleTapUMA(int type) {
- updateDoubleTapUmaTimer();
-
- if (mLastDoubleTapTimeMs == 0) return;
-
- long nowMs = SystemClock.uptimeMillis();
- if ((nowMs - mLastDoubleTapTimeMs) < ACTION_AFTER_DOUBLE_TAP_WINDOW_MS) {
- mMotionEventDelegate.sendActionAfterDoubleTapUMA(type, !mDisableClickDelay);
- mLastDoubleTapTimeMs = 0;
- }
- }
-
- // Watch for the UMA "action after double tap" timer expiring and reset
- // the timer if necessary.
- private void updateDoubleTapUmaTimer() {
- if (mLastDoubleTapTimeMs == 0) return;
-
- long nowMs = SystemClock.uptimeMillis();
- if ((nowMs - mLastDoubleTapTimeMs) >= ACTION_AFTER_DOUBLE_TAP_WINDOW_MS) {
- // Time expired, user took no action (that we care about).
- mMotionEventDelegate.sendActionAfterDoubleTapUMA(
- ContentViewCore.UMAActionAfterDoubleTap.NO_ACTION, !mDisableClickDelay);
- mLastDoubleTapTimeMs = 0;
- }
- }
-
- private boolean isDistanceGreaterThanTouchSlop(float distanceX, float distanceY) {
- return distanceX * distanceX + distanceY * distanceY > mScaledTouchSlopSquare;
- }
-}
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