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

Issue 181833003: [Android] Out with the Android GR, in with the new unified C++ GR (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Rebase Created 6 years, 10 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 92573f4550742e59f064ee6526dd86287a782a46..0000000000000000000000000000000000000000
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewGestureHandler.java
+++ /dev/null
@@ -1,993 +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.annotation.TargetApi;
-import android.content.Context;
-import android.os.Build;
-import android.os.Bundle;
-import android.os.SystemClock;
-import android.util.Log;
-import android.view.InputDevice;
-import android.view.MotionEvent;
-import android.view.ScaleGestureDetector;
-import android.view.ViewConfiguration;
-
-import org.chromium.base.CommandLine;
-import org.chromium.base.TraceEvent;
-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;
-
-/**
- * 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 {
-
- private static final String TAG = "ContentViewGestureHandler";
- /**
- * Used for FLING_START x velocity
- */
- static final String VELOCITY_X = "Velocity X";
- /**
- * Used for FLING_START y velocity
- */
- static final String VELOCITY_Y = "Velocity Y";
- /**
- * Used for SCROLL_BY x distance (scroll offset of update)
- */
- static final String DISTANCE_X = "Distance X";
- /**
- * Used for SCROLL_BY y distance (scroll offset of update)
- */
- static final String DISTANCE_Y = "Distance Y";
- /**
- * Used for SCROLL_START delta X hint (movement triggering scroll)
- */
- static final String DELTA_HINT_X = "Delta Hint X";
- /**
- * Used for SCROLL_START delta Y hint (movement triggering scroll)
- */
- static final String DELTA_HINT_Y = "Delta Hint Y";
- /**
- * Used in SINGLE_TAP_CONFIRMED to check whether ShowPress has been called before.
- */
- static final String SHOW_PRESS = "ShowPress";
- /**
- * Used for PINCH_BY delta
- */
- static final String DELTA = "Delta";
-
- 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 OnGestureListener mListener;
- private OnDoubleTapListener mDoubleTapListener;
- private ScaleGestureDetector mMultiTouchDetector;
- private ScaleGestureListener mMultiTouchListener;
- private MotionEvent mCurrentDownEvent;
- private final MotionEventDelegate mMotionEventDelegate;
-
- // 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 TAP_DOWN event has yet to be accompanied by a corresponding
- // SINGLE_TAP_UP, SINGLE_TAP_CONFIRMED, TAP_CANCEL or 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;
-
- // Used to remove the touch slop from the initial scroll event in a scroll gesture.
- private boolean mSeenFirstScrollEvent;
-
- private boolean mPinchInProgress = false;
-
- private static final int DOUBLE_TAP_TIMEOUT = ViewConfiguration.getDoubleTapTimeout();
-
- // 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 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;
-
- 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 {
- /**
- * Signal the start of gesture detection for the provided {@link MotionEvent}.
- * @param event The {@link MotionEvent} being fed to the gesture detectors.
- */
- public void onTouchEventHandlingBegin(MotionEvent event);
-
- /**
- * Signal that all gestures for the current {@link MotionEvent} have been dispatched.
- */
- public void onTouchEventHandlingEnd();
-
- /**
- * Forward a generated event to the client. This will normally be wrapped by
- * calls to {@link #onTouchEventHandlingBegin(MotionEvent)} and
- * {@link #onTouchEventHandlingEnd()}, unless the gesture is generated from
- * a touch timeout, e.g., LONG_PRESS.
- * @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 forwarded successfully.
- */
- boolean onGestureEventCreated(int type, long timeMs, int x, int y, Bundle extraParams);
- }
-
- ContentViewGestureHandler(Context context, MotionEventDelegate delegate) {
- mExtraParamBundleSingleTap = new Bundle();
- mExtraParamBundleFling = new Bundle();
- mExtraParamBundleScroll = new Bundle();
- mExtraParamBundleScrollStart = new Bundle();
- mExtraParamBundleDoubleTapDragZoom = new Bundle();
- mExtraParamBundlePinchBy = new Bundle();
-
- mMotionEventDelegate = delegate;
- mSnapScrollController = new SnapScrollController(context);
- mPxToDp = 1.0f / context.getResources().getDisplayMetrics().density;
-
- mDisableClickDelay = CommandLine.isInitialized() &&
- CommandLine.getInstance().hasSwitch(ContentSwitches.DISABLE_CLICK_DELAY);
-
- initGestureDetectors(context);
- }
-
- 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;
- mLastLongPressEvent = null;
- mNeedsTapEndingEvent = false;
- if (sendMotionEventAsGesture(GestureEventType.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);
- // 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(GestureEventType.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(GestureEventType.SCROLL_BY,
- e2.getEventTime(), x, y, mExtraParamBundleScroll);
- }
-
- 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(GestureEventType.SHOW_PRESS, 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) {
- if (e.getEventTime() - e.getDownTime() > DOUBLE_TAP_TIMEOUT) {
- if (sendTapEndingEventAsGesture(
- GestureEventType.SINGLE_TAP_UP, e, null)) {
- mIgnoreSingleTap = true;
- }
- 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(
- GestureEventType.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 (mIgnoreSingleTap) return true;
-
- mExtraParamBundleSingleTap.putBoolean(SHOW_PRESS, mShowPressIsCalled);
- assert mExtraParamBundleSingleTap.size() == 1;
- if (sendTapEndingEventAsGesture(GestureEventType.SINGLE_TAP_CONFIRMED, e,
- mExtraParamBundleSingleTap)) {
- mIgnoreSingleTap = true;
- }
- return true;
- }
-
- @Override
- public boolean onDoubleTapEvent(MotionEvent e) {
- switch (e.getActionMasked()) {
- case MotionEvent.ACTION_DOWN:
- // Note that this will be called before the corresponding |onDown()|
- // of the same ACTION_DOWN event. Thus, the preceding TAP_DOWN
- // should be cancelled prior to sending a new one (in |onDown()|).
- sendTapCancelIfNecessary(e);
- mDoubleTapDragZoomAnchorX = e.getX();
- mDoubleTapDragZoomAnchorY = e.getY();
- mDoubleTapMode = DOUBLE_TAP_MODE_DRAG_DETECTION_IN_PROGRESS;
- // If a long-press fires during a double-tap, the GestureDetector
- // will stop feeding MotionEvents to |onDoubleTapEvent()|,
- // preventing double-tap drag zoom. Long press detection will be
- // re-enabled on the next ACTION_DOWN.
- mGestureDetector.setIsLongpressEnabled(false);
- 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(GestureEventType.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(GestureEventType.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(
- GestureEventType.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 boolean onLongPress(MotionEvent e) {
- assert !isDoubleTapActive();
- if (isScaleGestureDetectionInProgress()) return false;
- setIgnoreSingleTap(true);
- mLastLongPressEvent = e;
- sendMotionEventAsGesture(GestureEventType.LONG_PRESS, e, null);
- // Returning true puts the GestureDetector in "longpress" mode, disabling
- // further scrolling. This is undesirable, as it is quite common for a
- // longpress gesture to fire on content that won't trigger a context menu.
- return false;
- }
-
- /**
- * 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);
-
- mMultiTouchListener = new ScaleGestureListener();
- mMultiTouchDetector = new ScaleGestureDetector(context, mMultiTouchListener);
- // ScaleGestureDetector's "QuickScale" feature was introduced in KitKat.
- // As ContentViewGestureHandler already implements this feature,
- // explicitly disable it to prevent double-handling of the gesture.
- if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
- disableQuickScale(mMultiTouchDetector);
- }
- } finally {
- TraceEvent.end();
- }
- }
-
- private class ScaleGestureListener implements ScaleGestureDetector.OnScaleGestureListener {
- // Completely silence scaling events. Used in WebView when zoom support
- // is turned off.
- private boolean mPermanentlyIgnoreDetectorEvents = false;
-
- // Whether any pinch zoom event has been sent to native.
- private boolean mPinchEventSent;
-
- // ScaleGestureDetector previous to 4.2.2 failed to record the touch event time
- // (b/7626515), so we record it manually for synthesizing pinch gestures.
- private long mCurrentEventTime;
-
- void setCurrentEventTime(long currentEventTime) {
- mCurrentEventTime = currentEventTime;
- }
-
- private long getEventTime(ScaleGestureDetector detector) {
- // Workaround for b/7626515, fixed in 4.2.2.
- assert mCurrentEventTime != 0;
- assert detector.getEventTime() == 0 || detector.getEventTime() == mCurrentEventTime;
- return mCurrentEventTime;
- }
-
- boolean getPermanentlyIgnoreDetectorEvents() {
- return mPermanentlyIgnoreDetectorEvents;
- }
-
- void setPermanentlyIgnoreDetectorEvents(boolean value) {
- // Note that returning false from onScaleBegin / onScale makes the
- // gesture detector not to emit further scaling notifications
- // related to this gesture. Thus, if detector events are enabled in
- // the middle of the gesture, we don't need to do anything.
- mPermanentlyIgnoreDetectorEvents = value;
- }
-
- @Override
- public boolean onScaleBegin(ScaleGestureDetector detector) {
- if (mPermanentlyIgnoreDetectorEvents) return false;
- mPinchEventSent = false;
- setIgnoreSingleTap(true);
- return true;
- }
-
- @Override
- public void onScaleEnd(ScaleGestureDetector detector) {
- if (!mPinchEventSent) return;
- pinchEnd(getEventTime(detector));
- mPinchEventSent = false;
- }
-
- @Override
- public boolean onScale(ScaleGestureDetector detector) {
- if (mPermanentlyIgnoreDetectorEvents) return false;
- // It is possible that pinchBegin() was never called when we reach here.
- // This happens when webkit handles the 2nd touch down event. That causes
- // ContentView to ignore the onScaleBegin() call. And if webkit does not
- // handle the touch move events afterwards, we will face a situation
- // that pinchBy() is called without any pinchBegin().
- // To solve this problem, we call pinchBegin() here if it is never called.
- if (!mPinchEventSent) {
- pinchBegin(getEventTime(detector),
- (int) detector.getFocusX(), (int) detector.getFocusY());
- mPinchEventSent = true;
- }
- pinchBy(getEventTime(detector), (int) detector.getFocusX(), (int) detector.getFocusY(),
- detector.getScaleFactor());
- return true;
- }
- };
-
- @TargetApi(Build.VERSION_CODES.KITKAT)
- private static void disableQuickScale(ScaleGestureDetector scaleGestureDetector) {
- if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return;
- scaleGestureDetector.setQuickScaleEnabled(false);
- }
-
- /**
- * 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) {
- if (velocityX == 0 && velocityY == 0) {
- endTouchScrollIfNecessary(timeMs, true);
- return;
- }
-
- if (!mTouchScrolling) {
- // The native side needs a SCROLL_BEGIN before 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(GestureEventType.SCROLL_START, timeMs, x, y, mExtraParamBundleScrollStart);
- }
- endTouchScrollIfNecessary(timeMs, false);
-
- mExtraParamBundleFling.putInt(VELOCITY_X, velocityX);
- mExtraParamBundleFling.putInt(VELOCITY_Y, velocityY);
- assert mExtraParamBundleFling.size() == 2;
- sendGesture(GestureEventType.FLING_START, timeMs, x, y, mExtraParamBundleFling);
- }
-
- /**π
- * End DOUBLE_TAP_MODE_DRAG_ZOOM by sending SCROLL_END and 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.
- */
- private void endDoubleTapDragIfNecessary(MotionEvent event) {
- assert event != null;
- if (!isDoubleTapActive()) return;
- if (mDoubleTapMode == DOUBLE_TAP_MODE_DRAG_ZOOM) {
- pinchEnd(event.getEventTime());
- sendGesture(GestureEventType.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 SCROLL_END event if necessary.
- * @param timeMs The time in ms for the event initiating this gesture.
- * @param sendScrollEndEvent Whether to send SCROLL_END event.
- */
- private void endTouchScrollIfNecessary(long timeMs, boolean sendScrollEndEvent) {
- if (!mTouchScrolling) return;
- mTouchScrolling = false;
- if (sendScrollEndEvent) {
- sendGesture(GestureEventType.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 PINCH_BEGIN and 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.
- */
- private void pinchBegin(long timeMs, int x, int y) {
- sendGesture(GestureEventType.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.
- */
- private void pinchBy(long timeMs, int anchorX, int anchorY, float delta) {
- mExtraParamBundlePinchBy.putFloat(DELTA, delta);
- assert mExtraParamBundlePinchBy.size() == 1;
- sendGesture(GestureEventType.PINCH_BY, timeMs, anchorX, anchorY, mExtraParamBundlePinchBy);
- mPinchInProgress = true;
- }
-
- /**
- * End a pinch gesture.
- * @param timeMs The time in ms for the event initiating this gesture.
- */
- private void pinchEnd(long timeMs) {
- sendGesture(GestureEventType.PINCH_END, timeMs, 0, 0, null);
- mPinchInProgress = false;
- }
-
- /**
- * Ignore singleTap gestures.
- */
- void setIgnoreSingleTap(boolean value) {
- mIgnoreSingleTap = value;
- }
-
- /**
- * 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() {
- if (mIgnoreRemainingTouchEvents) return;
-
- MotionEvent me = obtainActionCancelMotionEvent();
- if (mCurrentDownEvent != null) {
- // Only insert a synthetic event if there's an active touch sequence.
- onTouchEvent(me);
- } else {
- // Otherwise, we still want to reset the gesture detector pipeline
- // (e.g., reset double-tap detection state).
- mGestureDetector.onTouchEvent(me);
- processTouchEventForMultiTouch(me);
- }
- me.recycle();
-
- assert mCurrentDownEvent == null;
- mIgnoreRemainingTouchEvents = true;
- }
-
- /**
- * Handle the incoming MotionEvent.
- * @return Whether the event was handled.
- */
- boolean onTouchEvent(MotionEvent event) {
- final int eventAction = event.getActionMasked();
- // Only these actions have any effect on gesture detection. Other
- // actions have no corresponding WebTouchEvent type and may confuse the
- // touch pipline, so we ignore them entirely.
- if (eventAction != MotionEvent.ACTION_DOWN
- && eventAction != MotionEvent.ACTION_UP
- && eventAction != MotionEvent.ACTION_CANCEL
- && eventAction != MotionEvent.ACTION_MOVE
- && eventAction != MotionEvent.ACTION_POINTER_DOWN
- && eventAction != MotionEvent.ACTION_POINTER_UP) {
- return false;
- }
-
- try {
- TraceEvent.begin("onTouchEvent");
-
- if (mIgnoreRemainingTouchEvents) {
- if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
- mIgnoreRemainingTouchEvents = false;
- } else {
- return false;
- }
- }
-
- return processTouchEvent(event);
- } finally {
- TraceEvent.end("onTouchEvent");
- }
- }
-
- /**
- * Handle content view losing focus -- ensure that any remaining active state is removed.
- */
- void onWindowFocusLost() {
- // TODO(jdduke): Determine if this should behave more like setIgnoreRemainingTouchEvents().
- if (mLastLongPressEvent != null) {
- sendTapCancelIfNecessary(mLastLongPressEvent);
- }
- }
-
- private MotionEvent obtainActionCancelMotionEvent() {
- MotionEvent me = MotionEvent.obtain(
- mCurrentDownEvent != null ?
- mCurrentDownEvent.getDownTime() : 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);
- processTouchEventForMultiTouch(me);
- me.recycle();
- }
-
- private boolean processTouchEvent(MotionEvent event) {
- if (!canHandle(event)) return false;
-
- try {
- mMotionEventDelegate.onTouchEventHandlingBegin(event);
-
- final boolean wasTouchScrolling = mTouchScrolling;
-
- mSnapScrollController.setSnapScrollingMode(event, isScaleGestureDetectionInProgress());
-
- if (event.getActionMasked() == MotionEvent.ACTION_POINTER_DOWN) {
- endDoubleTapDragIfNecessary(event);
- } else if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
- mGestureDetector.setIsLongpressEnabled(true);
- mCurrentDownEvent = MotionEvent.obtain(event);
- }
-
- boolean handled = mGestureDetector.onTouchEvent(event);
- handled |= processTouchEventForMultiTouch(event);
-
- if (event.getAction() == MotionEvent.ACTION_UP
- || event.getAction() == MotionEvent.ACTION_CANCEL) {
- if (event.getAction() == MotionEvent.ACTION_CANCEL) {
- sendTapCancelIfNecessary(event);
- }
-
- // "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);
- }
-
- if (mCurrentDownEvent != null) recycleEvent(mCurrentDownEvent);
- mCurrentDownEvent = null;
- }
- return handled;
- } finally {
- mMotionEventDelegate.onTouchEventHandlingEnd();
- }
- }
-
- private boolean isScaleGestureDetectionInProgress() {
- return !mMultiTouchListener.getPermanentlyIgnoreDetectorEvents()
- && mMultiTouchDetector.isInProgress();
- }
-
- private boolean processTouchEventForMultiTouch(MotionEvent event) {
- // TODO(jdduke): Need to deal with multi-touch transition
- mMultiTouchListener.setCurrentEventTime(event.getEventTime());
- try {
- boolean inGesture = isScaleGestureDetectionInProgress();
- boolean retVal = mMultiTouchDetector.onTouchEvent(event);
- if (!inGesture && (event.getActionMasked() == MotionEvent.ACTION_UP
- || event.getActionMasked() == MotionEvent.ACTION_CANCEL)) {
- return false;
- }
- return retVal;
- } catch (Exception e) {
- Log.e(TAG, "ScaleGestureDetector got into a bad state!", e);
- assert false;
- }
- return false;
- }
-
- 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;
- // The only valid gestures that can occur after the touch sequence has
- // ended are SHOW_PRESS and SINGLE_TAP_CONFIRMED, potentially triggered
- // after the double-tap delay window times out.
- if (mCurrentDownEvent == null
- && type != GestureEventType.SINGLE_TAP_CONFIRMED
- && type != GestureEventType.SHOW_PRESS) {
- return false;
- }
- return mMotionEventDelegate.onGestureEventCreated(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(GestureEventType.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.
- */
- private 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.
- */
- private boolean triggerLongTapIfNeeded(MotionEvent ev) {
- if (mLastLongPressEvent != null
- && ev.getAction() == MotionEvent.ACTION_UP
- && !isScaleGestureDetectionInProgress()) {
- sendTapCancelIfNecessary(ev);
- sendMotionEventAsGesture(GestureEventType.LONG_TAP, ev, null);
- return true;
- }
- return false;
- }
-
- /**
- * 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 multi-touch gestures are supported.
- */
- public void updateMultiTouchSupport(boolean supportsMultiTouchZoom) {
- mMultiTouchListener.setPermanentlyIgnoreDetectorEvents(!supportsMultiTouchZoom);
- }
-
- /**
- * 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();
- }
-
- /**
- * @return Whether double-tap gesture detection is enabled.
- */
- public boolean isDoubleTapDisabled() {
- return mDoubleTapMode == DOUBLE_TAP_MODE_DISABLED || mShouldDisableDoubleTap;
- }
-
- /**
- * @return Whether the click delay preceding a double tap is disabled.
- */
- public boolean isClickDelayDisabled() {
- return mDisableClickDelay;
- }
-
- /**
- * @return Whether a double tap-gesture is in-progress.
- */
- public 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 boolean isDistanceGreaterThanTouchSlop(float distanceX, float distanceY) {
- return distanceX * distanceX + distanceY * distanceY > mScaledTouchSlopSquare;
- }
-}
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