content: /*
   * Copyright (C) 2010 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.amnesica.kryptey.inputmethod.keyboard;
  
  import android.content.res.Resources;
  import android.content.res.TypedArray;
  import android.util.Log;
  import android.view.MotionEvent;
  
  import com.amnesica.kryptey.inputmethod.R;
  import com.amnesica.kryptey.inputmethod.keyboard.internal.BogusMoveEventDetector;
  import com.amnesica.kryptey.inputmethod.keyboard.internal.DrawingProxy;
  import com.amnesica.kryptey.inputmethod.keyboard.internal.PointerTrackerQueue;
  import com.amnesica.kryptey.inputmethod.keyboard.internal.TimerProxy;
  import com.amnesica.kryptey.inputmethod.latin.common.Constants;
  import com.amnesica.kryptey.inputmethod.latin.common.CoordinateUtils;
  import com.amnesica.kryptey.inputmethod.latin.define.DebugFlags;
  import com.amnesica.kryptey.inputmethod.latin.settings.Settings;
  
  import java.util.ArrayList;
  
  public final class PointerTracker implements PointerTrackerQueue.Element {
    private static final String TAG = PointerTracker.class.getSimpleName();
    private static final boolean DEBUG_EVENT = false;
    private static final boolean DEBUG_MOVE_EVENT = false;
    private static final boolean DEBUG_LISTENER = false;
    private static final boolean DEBUG_MODE = DebugFlags.DEBUG_ENABLED || DEBUG_EVENT;
  
    static final class PointerTrackerParams {
      public final boolean mKeySelectionByDraggingFinger;
      public final int mTouchNoiseThresholdTime;
      public final int mTouchNoiseThresholdDistance;
      public final int mKeyRepeatStartTimeout;
      public final int mKeyRepeatInterval;
      public final int mLongPressShiftLockTimeout;
  
      public PointerTrackerParams(final TypedArray mainKeyboardViewAttr) {
        mKeySelectionByDraggingFinger = mainKeyboardViewAttr.getBoolean(
            R.styleable.MainKeyboardView_keySelectionByDraggingFinger, false);
        mTouchNoiseThresholdTime = mainKeyboardViewAttr.getInt(
            R.styleable.MainKeyboardView_touchNoiseThresholdTime, 0);
        mTouchNoiseThresholdDistance = mainKeyboardViewAttr.getDimensionPixelSize(
            R.styleable.MainKeyboardView_touchNoiseThresholdDistance, 0);
        mKeyRepeatStartTimeout = mainKeyboardViewAttr.getInt(
            R.styleable.MainKeyboardView_keyRepeatStartTimeout, 0);
        mKeyRepeatInterval = mainKeyboardViewAttr.getInt(
            R.styleable.MainKeyboardView_keyRepeatInterval, 0);
        mLongPressShiftLockTimeout = mainKeyboardViewAttr.getInt(
            R.styleable.MainKeyboardView_longPressShiftLockTimeout, 0);
      }
    }
  
    // Parameters for pointer handling.
    private static PointerTrackerParams sParams;
    private static final int sPointerStep = (int) (10.0 * Resources.getSystem().getDisplayMetrics().density);
  
    private static final ArrayList<PointerTracker> sTrackers = new ArrayList<>();
    private static final PointerTrackerQueue sPointerTrackerQueue = new PointerTrackerQueue();
  
    public final int mPointerId;
  
    private static DrawingProxy sDrawingProxy;
    private static TimerProxy sTimerProxy;
    private static KeyboardActionListener sListener = KeyboardActionListener.EMPTY_LISTENER;
  
    // The {@link KeyDetector} is set whenever the down event is processed. Also this is updated
    // when new {@link Keyboard} is set by {@link #setKeyDetector(KeyDetector)}.
    private KeyDetector mKeyDetector = new KeyDetector();
    private Keyboard mKeyboard;
    private final BogusMoveEventDetector mBogusMoveEventDetector = new BogusMoveEventDetector();
  
    // The position and time at which first down event occurred.
    private final int[] mDownCoordinates = CoordinateUtils.newInstance();
  
    // The current key where this pointer is.
    private Key mCurrentKey = null;
    // The position where the current key was recognized for the first time.
    private int mKeyX;
    private int mKeyY;
  
    // Last pointer position.
    private int mLastX;
    private int mLastY;
    private int mStartX;
    //private int mStartY;
    private long mStartTime;
    private boolean mCursorMoved = false;
  
    // true if keyboard layout has been changed.
    private boolean mKeyboardLayoutHasBeenChanged;
  
    // true if this pointer is no longer triggering any action because it has been canceled.
    private boolean mIsTrackingForActionDisabled;
  
    // the more keys panel currently being shown. equals null if no panel is active.
    private MoreKeysPanel mMoreKeysPanel;
  
    private static final int MULTIPLIER_FOR_LONG_PRESS_TIMEOUT_IN_SLIDING_INPUT = 3;
    // true if this pointer is in the dragging finger mode.
    boolean mIsInDraggingFinger;
    // true if this pointer is sliding from a modifier key and in the sliding key input mode,
    // so that further modifier keys should be ignored.
    boolean mIsInSlidingKeyInput;
    // if not a NOT_A_CODE, the key of this code is repeating
    private int mCurrentRepeatingKeyCode = Constants.NOT_A_CODE;
  
    // true if dragging finger is allowed.
    private boolean mIsAllowedDraggingFinger;
  
    // TODO: Add PointerTrackerFactory singleton and move some class static methods into it.
    public static void init(final TypedArray mainKeyboardViewAttr, final TimerProxy timerProxy,
                            final DrawingProxy drawingProxy) {
      sParams = new PointerTrackerParams(mainKeyboardViewAttr);
  
      final Resources res = mainKeyboardViewAttr.getResources();
      BogusMoveEventDetector.init(res);
  
      sTimerProxy = timerProxy;
      sDrawingProxy = drawingProxy;
    }
  
    public static PointerTracker getPointerTracker(final int id) {
      final ArrayList<PointerTracker> trackers = sTrackers;
  
      // Create pointer trackers until we can get 'id+1'-th tracker, if needed.
      for (int i = trackers.size(); i <= id; i++) {
        final PointerTracker tracker = new PointerTracker(i);
        trackers.add(tracker);
      }
  
      return trackers.get(id);
    }
  
    public static boolean isAnyInDraggingFinger() {
      return sPointerTrackerQueue.isAnyInDraggingFinger();
    }
  
    public static void cancelAllPointerTrackers() {
      sPointerTrackerQueue.cancelAllPointerTrackers();
    }
  
    public static void setKeyboardActionListener(final KeyboardActionListener listener) {
      sListener = listener;
    }
  
    public static void setKeyDetector(final KeyDetector keyDetector) {
      final Keyboard keyboard = keyDetector.getKeyboard();
      if (keyboard == null) {
        return;
      }
      final int trackersSize = sTrackers.size();
      for (int i = 0; i < trackersSize; ++i) {
        final PointerTracker tracker = sTrackers.get(i);
        tracker.setKeyDetectorInner(keyDetector);
      }
    }
  
    public static void setReleasedKeyGraphicsToAllKeys() {
      final int trackersSize = sTrackers.size();
      for (int i = 0; i < trackersSize; ++i) {
        final PointerTracker tracker = sTrackers.get(i);
        tracker.setReleasedKeyGraphics(tracker.getKey(), true /* withAnimation */);
      }
    }
  
    public static void dismissAllMoreKeysPanels() {
      final int trackersSize = sTrackers.size();
      for (int i = 0; i < trackersSize; ++i) {
        final PointerTracker tracker = sTrackers.get(i);
        tracker.dismissMoreKeysPanel();
      }
    }
  
    private PointerTracker(final int id) {
      mPointerId = id;
    }
  
    // Returns true if keyboard has been changed by this callback.
    private boolean callListenerOnPressAndCheckKeyboardLayoutChange(final Key key,
                                                                    final int repeatCount) {
      // While gesture input is going on, this method should be a no-operation. But when gesture
      // input has been canceled, <code>sInGesture</code> and <code>mIsDetectingGesture</code>
      // are set to false. To keep this method is a no-operation,
      // <code>mIsTrackingForActionDisabled</code> should also be taken account of.
      final boolean ignoreModifierKey = mIsInDraggingFinger && key.isModifier();
      if (DEBUG_LISTENER) {
        Log.d(TAG, String.format("[%d] onPress    : %s%s%s", mPointerId,
            (key == null ? "none" : Constants.printableCode(key.getCode())),
            ignoreModifierKey ? " ignoreModifier" : "",
            repeatCount > 0 ? " repeatCount=" + repeatCount : ""));
      }
      if (ignoreModifierKey) {
        return false;
      }
      sListener.onPressKey(key.getCode(), repeatCount, getActivePointerTrackerCount() == 1);
      final boolean keyboardLayoutHasBeenChanged = mKeyboardLayoutHasBeenChanged;
      mKeyboardLayoutHasBeenChanged = false;
      sTimerProxy.startTypingStateTimer(key);
      return keyboardLayoutHasBeenChanged;
    }
  
    // Note that we need primaryCode argument because the keyboard may in shifted state and the
    // primaryCode is different from {@link Key#mKeyCode}.
    private void callListenerOnCodeInput(final Key key, final int primaryCode, final int x,
                                         final int y, final boolean isKeyRepeat) {
      final boolean ignoreModifierKey = mIsInDraggingFinger && key.isModifier();
      final boolean altersCode = key.altCodeWhileTyping() && sTimerProxy.isTypingState();
      final int code = altersCode ? key.getAltCode() : primaryCode;
      if (DEBUG_LISTENER) {
        final String output = code == Constants.CODE_OUTPUT_TEXT
            ? key.getOutputText() : Constants.printableCode(code);
        Log.d(TAG, String.format("[%d] onCodeInput: %4d %4d %s%s%s", mPointerId, x, y,
            output, ignoreModifierKey ? " ignoreModifier" : "",
            altersCode ? " altersCode" : ""));
      }
      if (ignoreModifierKey) {
        return;
      }
  
      if (code == Constants.CODE_OUTPUT_TEXT) {
        sListener.onTextInput(key.getOutputText());
      } else if (code != Constants.CODE_UNSPECIFIED) {
        sListener.onCodeInput(code,
            Constants.NOT_A_COORDINATE, Constants.NOT_A_COORDINATE, isKeyRepeat);
      }
    }
  
    // Note that we need primaryCode argument because the keyboard may be in shifted state and the
    // primaryCode is different from {@link Key#mKeyCode}.
    private void callListenerOnRelease(final Key key, final int primaryCode,
                                       final boolean withSliding) {
      // See the comment at {@link #callListenerOnPressAndCheckKeyboardLayoutChange(Key}}.
      final boolean ignoreModifierKey = mIsInDraggingFinger && key.isModifier();
      if (DEBUG_LISTENER) {
        Log.d(TAG, String.format("[%d] onRelease  : %s%s%s", mPointerId,
            Constants.printableCode(primaryCode),
            withSliding ? " sliding" : "", ignoreModifierKey ? " ignoreModifier" : ""));
      }
      if (ignoreModifierKey) {
        return;
      }
      sListener.onReleaseKey(primaryCode, withSliding);
    }
  
    private void callListenerOnFinishSlidingInput() {
      if (DEBUG_LISTENER) {
        Log.d(TAG, String.format("[%d] onFinishSlidingInput", mPointerId));
      }
      sListener.onFinishSlidingInput();
    }
  
    private void setKeyDetectorInner(final KeyDetector keyDetector) {
      final Keyboard keyboard = keyDetector.getKeyboard();
      if (keyboard == null) {
        return;
      }
      if (keyDetector == mKeyDetector && keyboard == mKeyboard) {
        return;
      }
      mKeyDetector = keyDetector;
      mKeyboard = keyboard;
      // Mark that keyboard layout has been changed.
      mKeyboardLayoutHasBeenChanged = true;
      final int keyPaddedWidth = mKeyboard.mMostCommonKeyWidth
          + Math.round(mKeyboard.mHorizontalGap);
      final int keyPaddedHeight = mKeyboard.mMostCommonKeyHeight
          + Math.round(mKeyboard.mVerticalGap);
      // Keep {@link #mCurrentKey} that comes from previous keyboard. The key preview of
      // {@link #mCurrentKey} will be dismissed by {@setReleasedKeyGraphics(Key)} via
      // {@link onMoveEventInternal(int,int,long)} or {@link #onUpEventInternal(int,int,long)}.
      mBogusMoveEventDetector.setKeyboardGeometry(keyPaddedWidth, keyPaddedHeight);
    }
  
    @Override
    public boolean isInDraggingFinger() {
      return mIsInDraggingFinger;
    }
  
    public Key getKey() {
      return mCurrentKey;
    }
  
    @Override
    public boolean isModifier() {
      return mCurrentKey != null && mCurrentKey.isModifier();
    }
  
    public Key getKeyOn(final int x, final int y) {
      return mKeyDetector.detectHitKey(x, y);
    }
  
    private void setReleasedKeyGraphics(final Key key, final boolean withAnimation) {
      if (key == null) {
        return;
      }
  
      sDrawingProxy.onKeyReleased(key, withAnimation);
  
      if (key.isShift()) {
        for (final Key shiftKey : mKeyboard.mShiftKeys) {
          if (shiftKey != key) {
            sDrawingProxy.onKeyReleased(shiftKey, false /* withAnimation */);
          }
        }
      }
  
      if (key.altCodeWhileTyping()) {
        final int altCode = key.getAltCode();
        final Key altKey = mKeyboard.getKey(altCode);
        if (altKey != null) {
          sDrawingProxy.onKeyReleased(altKey, false /* withAnimation */);
        }
        for (final Key k : mKeyboard.mAltCodeKeysWhileTyping) {
          if (k != key && k.getAltCode() == altCode) {
            sDrawingProxy.onKeyReleased(k, false /* withAnimation */);
          }
        }
      }
    }
  
    private void setPressedKeyGraphics(final Key key) {
      if (key == null) {
        return;
      }
  
      // Even if the key is disabled, it should respond if it is in the altCodeWhileTyping state.
      final boolean altersCode = key.altCodeWhileTyping() && sTimerProxy.isTypingState();
  
      sDrawingProxy.onKeyPressed(key, true);
  
      if (key.isShift()) {
        for (final Key shiftKey : mKeyboard.mShiftKeys) {
          if (shiftKey != key) {
            sDrawingProxy.onKeyPressed(shiftKey, false /* withPreview */);
          }
        }
      }
  
      if (altersCode) {
        final int altCode = key.getAltCode();
        final Key altKey = mKeyboard.getKey(altCode);
        if (altKey != null) {
          sDrawingProxy.onKeyPressed(altKey, false /* withPreview */);
        }
        for (final Key k : mKeyboard.mAltCodeKeysWhileTyping) {
          if (k != key && k.getAltCode() == altCode) {
            sDrawingProxy.onKeyPressed(k, false /* withPreview */);
          }
        }
      }
    }
  
    public void getLastCoordinates(final int[] outCoords) {
      CoordinateUtils.set(outCoords, mLastX, mLastY);
    }
  
    private Key onDownKey(final int x, final int y) {
      CoordinateUtils.set(mDownCoordinates, x, y);
      mBogusMoveEventDetector.onDownKey();
      return onMoveToNewKey(onMoveKeyInternal(x, y), x, y);
    }
  
    private static int getDistance(final int x1, final int y1, final int x2, final int y2) {
      return (int) Math.hypot(x1 - x2, y1 - y2);
    }
  
    private Key onMoveKeyInternal(final int x, final int y) {
      mBogusMoveEventDetector.onMoveKey(getDistance(x, y, mLastX, mLastY));
      mLastX = x;
      mLastY = y;
      return mKeyDetector.detectHitKey(x, y);
    }
  
    private Key onMoveKey(final int x, final int y) {
      return onMoveKeyInternal(x, y);
    }
  
    private Key onMoveToNewKey(final Key newKey, final int x, final int y) {
      mCurrentKey = newKey;
      mKeyX = x;
      mKeyY = y;
      return newKey;
    }
  
    /* package */
    static int getActivePointerTrackerCount() {
      return sPointerTrackerQueue.size();
    }
  
    public void processMotionEvent(final MotionEvent me, final KeyDetector keyDetector) {
      final int action = me.getActionMasked();
      final long eventTime = me.getEventTime();
      if (action == MotionEvent.ACTION_MOVE) {
        // When this pointer is the only active pointer and is showing a more keys panel,
        // we should ignore other pointers' motion event.
        final boolean shouldIgnoreOtherPointers =
            isShowingMoreKeysPanel() && getActivePointerTrackerCount() == 1;
        final int pointerCount = me.getPointerCount();
        for (int index = 0; index < pointerCount; index++) {
          final int id = me.getPointerId(index);
          if (shouldIgnoreOtherPointers && id != mPointerId) {
            continue;
          }
          final int x = (int) me.getX(index);
          final int y = (int) me.getY(index);
          final PointerTracker tracker = getPointerTracker(id);
          tracker.onMoveEvent(x, y, eventTime);
        }
        return;
      }
      final int index = me.getActionIndex();
      final int x = (int) me.getX(index);
      final int y = (int) me.getY(index);
      switch (action) {
        case MotionEvent.ACTION_DOWN:
        case MotionEvent.ACTION_POINTER_DOWN:
          onDownEvent(x, y, eventTime, keyDetector);
          break;
        case MotionEvent.ACTION_UP:
        case MotionEvent.ACTION_POINTER_UP:
          onUpEvent(x, y, eventTime);
          break;
        case MotionEvent.ACTION_CANCEL:
          onCancelEvent(x, y, eventTime);
          break;
      }
    }
  
    private void onDownEvent(final int x, final int y, final long eventTime,
                             final KeyDetector keyDetector) {
      setKeyDetectorInner(keyDetector);
      if (DEBUG_EVENT) {
        printTouchEvent("onDownEvent:", x, y, eventTime);
      }
      // Naive up-to-down noise filter.
      final long deltaT = eventTime;
      if (deltaT < sParams.mTouchNoiseThresholdTime) {
        final int distance = getDistance(x, y, mLastX, mLastY);
        if (distance < sParams.mTouchNoiseThresholdDistance) {
          if (DEBUG_MODE)
            Log.w(TAG, String.format("[%d] onDownEvent:"
                    + " ignore potential noise: time=%d distance=%d",
                mPointerId, deltaT, distance));
          cancelTrackingForAction();
          return;
        }
      }
  
      final Key key = getKeyOn(x, y);
      mBogusMoveEventDetector.onActualDownEvent(x, y);
      if (key != null && key.isModifier()) {
        // Before processing a down event of modifier key, all pointers already being
        // tracked should be released.
        sPointerTrackerQueue.releaseAllPointers(eventTime);
      }
      sPointerTrackerQueue.add(this);
      onDownEventInternal(x, y);
    }
  
    /* package */ boolean isShowingMoreKeysPanel() {
      return (mMoreKeysPanel != null);
    }
  
    private void dismissMoreKeysPanel() {
      if (isShowingMoreKeysPanel()) {
        mMoreKeysPanel.dismissMoreKeysPanel();
        mMoreKeysPanel = null;
      }
    }
  
    private void onDownEventInternal(final int x, final int y) {
      Key key = onDownKey(x, y);
      // Key selection by dragging finger is allowed when 1) key selection by dragging finger is
      // enabled by configuration, 2) this pointer starts dragging from modifier key, or 3) this
      // pointer's KeyDetector always allows key selection by dragging finger, such as
      // {@link MoreKeysKeyboard}.
      mIsAllowedDraggingFinger = sParams.mKeySelectionByDraggingFinger
          || (key != null && key.isModifier())
          || mKeyDetector.alwaysAllowsKeySelectionByDraggingFinger();
      mKeyboardLayoutHasBeenChanged = false;
      mIsTrackingForActionDisabled = false;
      resetKeySelectionByDraggingFinger();
      if (key != null) {
        // This onPress call may have changed keyboard layout. Those cases are detected at
        // {@link #setKeyboard}. In those cases, we should update key according to the new
        // keyboard layout.
        if (callListenerOnPressAndCheckKeyboardLayoutChange(key, 0 /* repeatCount */)) {
          key = onDownKey(x, y);
        }
  
        startRepeatKey(key);
        startLongPressTimer(key);
        setPressedKeyGraphics(key);
        mStartX = x;
        //mStartY = y;
        mStartTime = System.currentTimeMillis();
      }
    }
  
    private void startKeySelectionByDraggingFinger(final Key key) {
      if (!mIsInDraggingFinger) {
        mIsInSlidingKeyInput = key.isModifier();
      }
      mIsInDraggingFinger = true;
    }
  
    private void resetKeySelectionByDraggingFinger() {
      mIsInDraggingFinger = false;
      mIsInSlidingKeyInput = false;
    }
  
    private void onMoveEvent(final int x, final int y, final long eventTime) {
      if (DEBUG_MOVE_EVENT) {
        printTouchEvent("onMoveEvent:", x, y, eventTime);
      }
      if (mIsTrackingForActionDisabled) {
        return;
      }
  
      if (isShowingMoreKeysPanel()) {
        final int translatedX = mMoreKeysPanel.translateX(x);
        final int translatedY = mMoreKeysPanel.translateY(y);
        mMoreKeysPanel.onMoveEvent(translatedX, translatedY, mPointerId);
        onMoveKey(x, y);
        return;
      }
      onMoveEventInternal(x, y, eventTime);
    }
  
    private void processDraggingFingerInToNewKey(final Key newKey, final int x, final int y) {
      // This onPress call may have changed keyboard layout. Those cases are detected
      // at {@link #setKeyboard}. In those cases, we should update key according
      // to the new keyboard layout.
      Key key = newKey;
      if (callListenerOnPressAndCheckKeyboardLayoutChange(key, 0 /* repeatCount */)) {
        key = onMoveKey(x, y);
      }
      onMoveToNewKey(key, x, y);
      if (mIsTrackingForActionDisabled) {
        return;
      }
      startLongPressTimer(key);
      setPressedKeyGraphics(key);
    }
  
    private void processDraggingFingerOutFromOldKey(final Key oldKey) {
      setReleasedKeyGraphics(oldKey, true /* withAnimation */);
      callListenerOnRelease(oldKey, oldKey.getCode(), true /* withSliding */);
      startKeySelectionByDraggingFinger(oldKey);
      sTimerProxy.cancelKeyTimersOf(this);
    }
  
    private void dragFingerFromOldKeyToNewKey(final Key key, final int x, final int y,
                                              final long eventTime, final Key oldKey) {
      // The pointer has been slid in to the new key from the previous key, we must call
      // onRelease() first to notify that the previous key has been released, then call
      // onPress() to notify that the new key is being pressed.
      processDraggingFingerOutFromOldKey(oldKey);
      startRepeatKey(key);
      if (mIsAllowedDraggingFinger) {
        processDraggingFingerInToNewKey(key, x, y);
      }
      // HACK: If there are currently multiple touches, register the key even if the finger
      // slides off the key. This defends against noise from some touch panels when there are
      // close multiple touches.
      // Caveat: When in chording input mode with a modifier key, we don't use this hack.
      else if (getActivePointerTrackerCount() > 1
          && !sPointerTrackerQueue.hasModifierKeyOlderThan(this)) {
        if (DEBUG_MODE) {
          Log.w(TAG, String.format("[%d] onMoveEvent:"
              + " detected sliding finger while multi touching", mPointerId));
        }
        onUpEvent(x, y, eventTime);
        cancelTrackingForAction();
        setReleasedKeyGraphics(oldKey, true /* withAnimation */);
      } else {
        cancelTrackingForAction();
        setReleasedKeyGraphics(oldKey, true /* withAnimation */);
      }
    }
  
    private void dragFingerOutFromOldKey(final Key oldKey, final int x, final int y) {
      // The pointer has been slid out from the previous key, we must call onRelease() to
      // notify that the previous key has been released.
      processDraggingFingerOutFromOldKey(oldKey);
      if (mIsAllowedDraggingFinger) {
        onMoveToNewKey(null, x, y);
      } else {
        cancelTrackingForAction();
      }
    }
  
    private void onMoveEventInternal(final int x, final int y, final long eventTime) {
      final Key oldKey = mCurrentKey;
  
      if (oldKey != null && oldKey.getCode() == Constants.CODE_SPACE && Settings.getInstance().getCurrent().mSpaceSwipeEnabled) {
        //Pointer slider
        int steps = (x - mStartX) / sPointerStep;
        final int longpressTimeout = Settings.getInstance().getCurrent().mKeyLongpressTimeout / MULTIPLIER_FOR_LONG_PRESS_TIMEOUT_IN_SLIDING_INPUT;
        if (steps != 0 && mStartTime + longpressTimeout < System.currentTimeMillis()) {
          mCursorMoved = true;
          mStartX += steps * sPointerStep;
          sListener.onMovePointer(steps);
        }
        return;
      }
  
      if (oldKey != null && oldKey.getCode() == Constants.CODE_DELETE && Settings.getInstance().getCurrent().mDeleteSwipeEnabled) {
        //Delete slider
        int steps = (x - mStartX) / sPointerStep;
        if (steps != 0) {
          sTimerProxy.cancelKeyTimersOf(this);
          mCursorMoved = true;
          mStartX += steps * sPointerStep;
          sListener.onMoveDeletePointer(steps);
        }
        return;
      }
  
      final Key newKey = onMoveKey(x, y);
      if (newKey != null) {
        if (oldKey != null && isMajorEnoughMoveToBeOnNewKey(x, y, newKey)) {
          dragFingerFromOldKeyToNewKey(newKey, x, y, eventTime, oldKey);
        } else if (oldKey == null) {
          // The pointer has been slid in to the new key, but the finger was not on any keys.
          // In this case, we must call onPress() to notify that the new key is being pressed.
          processDraggingFingerInToNewKey(newKey, x, y);
        }
      } else { // newKey == null
        if (oldKey != null && isMajorEnoughMoveToBeOnNewKey(x, y, newKey)) {
          dragFingerOutFromOldKey(oldKey, x, y);
        }
      }
    }
  
    private void onUpEvent(final int x, final int y, final long eventTime) {
      if (DEBUG_EVENT) {
        printTouchEvent("onUpEvent  :", x, y, eventTime);
      }
  
      sTimerProxy.cancelUpdateBatchInputTimer(this);
      if (mCurrentKey != null && mCurrentKey.isModifier()) {
        // Before processing an up event of modifier key, all pointers already being
        // tracked should be released.
        sPointerTrackerQueue.releaseAllPointersExcept(this, eventTime);
      } else {
        sPointerTrackerQueue.releaseAllPointersOlderThan(this, eventTime);
      }
      onUpEventInternal(x, y);
      sPointerTrackerQueue.remove(this);
    }
  
    // Let this pointer tracker know that one of newer-than-this pointer trackers got an up event.
    // This pointer tracker needs to keep the key top graphics "pressed", but needs to get a
    // "virtual" up event.
    @Override
    public void onPhantomUpEvent(final long eventTime) {
      if (DEBUG_EVENT) {
        printTouchEvent("onPhntEvent:", mLastX, mLastY, eventTime);
      }
      onUpEventInternal(mLastX, mLastY);
      cancelTrackingForAction();
    }
  
    private void onUpEventInternal(final int x, final int y) {
      sTimerProxy.cancelKeyTimersOf(this);
      final boolean isInDraggingFinger = mIsInDraggingFinger;
      final boolean isInSlidingKeyInput = mIsInSlidingKeyInput;
      resetKeySelectionByDraggingFinger();
      final Key currentKey = mCurrentKey;
      mCurrentKey = null;
      final int currentRepeatingKeyCode = mCurrentRepeatingKeyCode;
      mCurrentRepeatingKeyCode = Constants.NOT_A_CODE;
      // Release the last pressed key.
      setReleasedKeyGraphics(currentKey, true /* withAnimation */);
  
      if (mCursorMoved && currentKey.getCode() == Constants.CODE_DELETE) {
        sListener.onUpWithDeletePointerActive();
      }
  
      if (isShowingMoreKeysPanel()) {
        if (!mIsTrackingForActionDisabled) {
          final int translatedX = mMoreKeysPanel.translateX(x);
          final int translatedY = mMoreKeysPanel.translateY(y);
          mMoreKeysPanel.onUpEvent(translatedX, translatedY, mPointerId);
        }
        dismissMoreKeysPanel();
        return;
      }
  
      if (mCursorMoved) {
        mCursorMoved = false;
        return;
      }
      if (mIsTrackingForActionDisabled) {
        return;
      }
      if (currentKey != null && currentKey.isRepeatable()
          && (currentKey.getCode() == currentRepeatingKeyCode) && !isInDraggingFinger) {
        return;
      }
      detectAndSendKey(currentKey, mKeyX, mKeyY);
      if (isInSlidingKeyInput) {
        callListenerOnFinishSlidingInput();
      }
    }
  
    @Override
    public void cancelTrackingForAction() {
      if (isShowingMoreKeysPanel()) {
        return;
      }
      mIsTrackingForActionDisabled = true;
    }
  
    public void onLongPressed() {
      sTimerProxy.cancelLongPressTimersOf(this);
      if (isShowingMoreKeysPanel()) {
        return;
      }
      if (mCursorMoved) {
        return;
      }
      final Key key = getKey();
      if (key == null) {
        return;
      }
      if (key.hasNoPanelAutoMoreKey()) {
        cancelKeyTracking();
        final int moreKeyCode = key.getMoreKeys()[0].mCode;
        sListener.onPressKey(moreKeyCode, 0 /* repeatCont */, true /* isSinglePointer */);
        sListener.onCodeInput(moreKeyCode, Constants.NOT_A_COORDINATE,
            Constants.NOT_A_COORDINATE, false /* isKeyRepeat */);
        sListener.onReleaseKey(moreKeyCode, false /* withSliding */);
        return;
      }
      final int code = key.getCode();
      if (code == Constants.CODE_SPACE || code == Constants.CODE_LANGUAGE_SWITCH) {
        // Long pressing the space key invokes IME switcher dialog.
        if (sListener.onCustomRequest(Constants.CUSTOM_CODE_SHOW_INPUT_METHOD_PICKER)) {
          cancelKeyTracking();
          sListener.onReleaseKey(code, false /* withSliding */);
          return;
        }
      }
  
      setReleasedKeyGraphics(key, false /* withAnimation */);
      final MoreKeysPanel moreKeysPanel = sDrawingProxy.showMoreKeysKeyboard(key, this);
      if (moreKeysPanel == null) {
        return;
      }
      final int translatedX = moreKeysPanel.translateX(mLastX);
      final int translatedY = moreKeysPanel.translateY(mLastY);
      moreKeysPanel.onDownEvent(translatedX, translatedY, mPointerId);
      mMoreKeysPanel = moreKeysPanel;
    }
  
    private void cancelKeyTracking() {
      resetKeySelectionByDraggingFinger();
      cancelTrackingForAction();
      setReleasedKeyGraphics(mCurrentKey, true /* withAnimation */);
      sPointerTrackerQueue.remove(this);
    }
  
    private void onCancelEvent(final int x, final int y, final long eventTime) {
      if (DEBUG_EVENT) {
        printTouchEvent("onCancelEvt:", x, y, eventTime);
      }
  
      cancelAllPointerTrackers();
      sPointerTrackerQueue.releaseAllPointers(eventTime);
      onCancelEventInternal();
    }
  
    private void onCancelEventInternal() {
      sTimerProxy.cancelKeyTimersOf(this);
      setReleasedKeyGraphics(mCurrentKey, true /* withAnimation */);
      resetKeySelectionByDraggingFinger();
      dismissMoreKeysPanel();
    }
  
    private boolean isMajorEnoughMoveToBeOnNewKey(final int x, final int y, final Key newKey) {
      final Key curKey = mCurrentKey;
      if (newKey == curKey) {
        return false;
      }
      if (curKey == null /* && newKey != null */) {
        return true;
      }
      // Here curKey points to the different key from newKey.
      final int keyHysteresisDistanceSquared = mKeyDetector.getKeyHysteresisDistanceSquared(
          mIsInSlidingKeyInput);
      final int distanceFromKeyEdgeSquared = curKey.squaredDistanceToHitboxEdge(x, y);
      if (distanceFromKeyEdgeSquared >= keyHysteresisDistanceSquared) {
        if (DEBUG_MODE) {
          final float distanceToEdgeRatio = (float) Math.sqrt(distanceFromKeyEdgeSquared)
              / (mKeyboard.mMostCommonKeyWidth + mKeyboard.mHorizontalGap);
          Log.d(TAG, String.format("[%d] isMajorEnoughMoveToBeOnNewKey:"
              + " %.2f key width from key edge", mPointerId, distanceToEdgeRatio));
        }
        return true;
      }
      if (!mIsAllowedDraggingFinger && mBogusMoveEventDetector.hasTraveledLongDistance(x, y)) {
        if (DEBUG_MODE) {
          final float keyDiagonal = (float) Math.hypot(
              mKeyboard.mMostCommonKeyWidth + mKeyboard.mHorizontalGap,
              mKeyboard.mMostCommonKeyHeight + mKeyboard.mVerticalGap);
          final float lengthFromDownRatio =
              mBogusMoveEventDetector.getAccumulatedDistanceFromDownKey() / keyDiagonal;
          Log.d(TAG, String.format("[%d] isMajorEnoughMoveToBeOnNewKey:"
                  + " %.2f key diagonal from virtual down point",
              mPointerId, lengthFromDownRatio));
        }
        return true;
      }
      return false;
    }
  
    private void startLongPressTimer(final Key key) {
      // Note that we need to cancel all active long press shift key timers if any whenever we
      // start a new long press timer for both non-shift and shift keys.
      sTimerProxy.cancelLongPressShiftKeyTimer();
      if (key == null) return;
      if (!key.isLongPressEnabled()) return;
      // Caveat: Please note that isLongPressEnabled() can be true even if the current key
      // doesn't have its more keys. (e.g. spacebar, globe key) If we are in the dragging finger
      // mode, we will disable long press timer of such key.
      // We always need to start the long press timer if the key has its more keys regardless of
      // whether or not we are in the dragging finger mode.
      if (mIsInDraggingFinger && key.getMoreKeys() == null) return;
  
      final int delay = getLongPressTimeout(key.getCode());
      if (delay <= 0) return;
      sTimerProxy.startLongPressTimerOf(this, delay);
    }
  
    private int getLongPressTimeout(final int code) {
      if (code == Constants.CODE_SHIFT) {
        return sParams.mLongPressShiftLockTimeout;
      }
      final int longpressTimeout = Settings.getInstance().getCurrent().mKeyLongpressTimeout;
      if (mIsInSlidingKeyInput) {
        // We use longer timeout for sliding finger input started from the modifier key.
        return longpressTimeout * MULTIPLIER_FOR_LONG_PRESS_TIMEOUT_IN_SLIDING_INPUT;
      }
      if (code == Constants.CODE_SPACE) {
        // Cursor can be moved in space
        return longpressTimeout * MULTIPLIER_FOR_LONG_PRESS_TIMEOUT_IN_SLIDING_INPUT;
      }
      return longpressTimeout;
    }
  
    private void detectAndSendKey(final Key key, final int x, final int y) {
      if (key == null) return;
  
      final int code = key.getCode();
      callListenerOnCodeInput(key, code, x, y, false /* isKeyRepeat */);
      callListenerOnRelease(key, code, false /* withSliding */);
    }
  
    private void startRepeatKey(final Key key) {
      if (key == null) return;
      if (!key.isRepeatable()) return;
      // Don't start key repeat when we are in the dragging finger mode.
      if (mIsInDraggingFinger) return;
      final int startRepeatCount = 1;
      startKeyRepeatTimer(startRepeatCount);
    }
  
    public void onKeyRepeat(final int code, final int repeatCount) {
      final Key key = getKey();
      if (key == null || key.getCode() != code) {
        mCurrentRepeatingKeyCode = Constants.NOT_A_CODE;
        return;
      }
      mCurrentRepeatingKeyCode = code;
      final int nextRepeatCount = repeatCount + 1;
      startKeyRepeatTimer(nextRepeatCount);
      callListenerOnPressAndCheckKeyboardLayoutChange(key, repeatCount);
      callListenerOnCodeInput(key, code, mKeyX, mKeyY, true /* isKeyRepeat */);
    }
  
    private void startKeyRepeatTimer(final int repeatCount) {
      final int delay =
          (repeatCount == 1) ? sParams.mKeyRepeatStartTimeout : sParams.mKeyRepeatInterval;
      sTimerProxy.startKeyRepeatTimerOf(this, repeatCount, delay);
    }
  
    private void printTouchEvent(final String title, final int x, final int y,
                                 final long eventTime) {
      final Key key = mKeyDetector.detectHitKey(x, y);
      final String code = (key == null ? "none" : Constants.printableCode(key.getCode()));
      Log.d(TAG, String.format("[%d]%s%s %4d %4d %5d %s", mPointerId,
          (mIsTrackingForActionDisabled ? "-" : " "), title, x, y, eventTime, code));
    }
  }
  