[Android] Perform eager gesture recognition on MotionEvents

content/public/android/java/src/org/chromium/content/browser/LongPressDetector.java

Index: content/public/android/java/src/org/chromium/content/browser/LongPressDetector.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/LongPressDetector.java b/content/public/android/java/src/org/chromium/content/browser/LongPressDetector.java
deleted file mode 100644
index 391441ecfa32458a0b3101e0c64425debb3f5997..0000000000000000000000000000000000000000
--- a/content/public/android/java/src/org/chromium/content/browser/LongPressDetector.java
+++ /dev/null
@@ -1,166 +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.Handler;
-import android.os.Message;
-import android.view.MotionEvent;
-import android.view.ViewConfiguration;
-
-import java.util.Iterator;
-
-/**
- * This class controls long press timers and is owned by a ContentViewGestureHandler.
- *
- * For instance, we may receive a DOWN then UP, so we may need to cancel the
- * timer before the UP completes its roundtrip from WebKit.
- */
-class LongPressDetector {
-    private MotionEvent mCurrentDownEvent;
-    private final LongPressDelegate mLongPressDelegate;
-    private final Handler mLongPressHandler;
-    private final int mTouchSlopSquare;
-    private boolean mInLongPress;
-
-    private static final int LONG_PRESS = 2;
-
-    private static final int LONGPRESS_TIMEOUT = ViewConfiguration.getLongPressTimeout();
-    private static final int TAP_TIMEOUT = ViewConfiguration.getTapTimeout();
-
-    LongPressDetector(Context context, LongPressDelegate delegate) {
-        mLongPressDelegate = delegate;
-        mLongPressHandler = new LongPressHandler();
-        final ViewConfiguration configuration = ViewConfiguration.get(context);
-        int touchSlop = configuration.getScaledTouchSlop();
-        mTouchSlopSquare = touchSlop * touchSlop;
-    }
-
-    private class LongPressHandler extends Handler {
-        LongPressHandler() {
-            super();
-        }
-
-        @Override
-        public void handleMessage(Message msg) {
-            switch (msg.what) {
-                case LONG_PRESS:
-                    dispatchLongPress();
-                    break;
-                default:
-                    throw new RuntimeException("Unknown message " + msg); // never
-            }
-        }
-    }
-
-    /**
-     * This is an interface to execute the LongPress when it receives the onLongPress message.
-     */
-    interface LongPressDelegate {
-        /**
-         * @param event The event will be recycled after this call has returned.
-         */
-        public void onLongPress(MotionEvent event);
-    }
-
-    private static long calculateLongPressTimeoutTime(MotionEvent ev) {
-        // Using getEventTime instead of getDownTime since for Android WebView,
-        // event stream can be arbitrarily delayed.
-        return ev.getEventTime() + TAP_TIMEOUT + LONGPRESS_TIMEOUT;
-    }
-
-    /**
-     * Initiates a LONG_PRESS gesture timer if needed.
-     */
-    void startLongPressTimerIfNeeded(MotionEvent ev) {
-        if (ev.getAction() != MotionEvent.ACTION_DOWN) return;
-
-        // If there is a current down, we do not expect another down event before
-        // receiving an up event
-        if (mCurrentDownEvent != null) return;
-
-        mCurrentDownEvent = MotionEvent.obtain(ev);
-        mLongPressHandler.sendEmptyMessageAtTime(LONG_PRESS,
-                calculateLongPressTimeoutTime(mCurrentDownEvent));
-        mInLongPress = false;
-    }
-
-    // Cancel LONG_PRESS timers.
-    void cancelLongPressIfNeeded(MotionEvent ev) {
-        if (!hasPendingMessage() ||
-            mCurrentDownEvent == null || ev.getDownTime() != mCurrentDownEvent.getDownTime()) {
-            return;
-        }
-        final int action = ev.getAction();
-        final float y = ev.getY();
-        final float x = ev.getX();
-        switch (action & MotionEvent.ACTION_MASK) {
-            case MotionEvent.ACTION_MOVE:
-                final int deltaX = (int) (x - mCurrentDownEvent.getX());
-                final int deltaY = (int) (y - mCurrentDownEvent.getY());
-                int distance = (deltaX * deltaX) + (deltaY * deltaY);
-                if (distance > mTouchSlopSquare) {
-                    cancelLongPress();
-                }
-                break;
-            case MotionEvent.ACTION_UP:
-            case MotionEvent.ACTION_CANCEL:
-                if (calculateLongPressTimeoutTime(mCurrentDownEvent) > ev.getEventTime()) {
-                    cancelLongPress();
-                }
-                break;
-            default:
-                break;
-        }
-    }
-
-    // Given a stream of pending events, cancel the LONG_PRESS timer if appropriate.
-    void cancelLongPressIfNeeded(Iterator<MotionEvent> pendingEvents) {
-        if (mCurrentDownEvent == null)
-            return;
-        long currentDownTime = mCurrentDownEvent.getDownTime();
-        while (pendingEvents.hasNext()) {
-            MotionEvent pending = pendingEvents.next();
-            if (pending.getDownTime() != currentDownTime) {
-                break;
-            }
-            cancelLongPressIfNeeded(pending);
-        }
-    }
-
-    void cancelLongPress() {
-        mInLongPress = false;
-        if (hasPendingMessage()) {
-            mLongPressHandler.removeMessages(LONG_PRESS);
-            mCurrentDownEvent.recycle();
-            mCurrentDownEvent = null;
-        }
-    }
-
-    // Used this to check if a onSingleTapUp is part of a long press event.
-    boolean isInLongPress() {
-        return mInLongPress;
-    }
-
-    private void dispatchLongPress() {
-        mInLongPress = true;
-        mLongPressDelegate.onLongPress(mCurrentDownEvent);
-        mCurrentDownEvent.recycle();
-        mCurrentDownEvent = null;
-    }
-
-    boolean hasPendingMessage() {
-        return mCurrentDownEvent != null;
-    }
-
-    /**
-     * This is for testing only.
-     * Sends a LongPress gesture. This should always be called after a down event.
-     */
-    void sendLongPressGestureForTest() {
-        if (mCurrentDownEvent == null) return;
-        dispatchLongPress();
-    }
-}