Rename LatinKeyboardBaseView to LatinKeyboardView

Bug: 5182291
Change-Id: I5089a14902b9f4ff1ab4f34e3f7a42aca5040d3e

1 files changed, 691 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/keyboard/LatinKeyboardView.java b/java/src/com/android/inputmethod/keyboard/LatinKeyboardView.java
new file mode 100644
index 000000000..be04b5a52
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/LatinKeyboardView.java
@@ -0,0 +1,691 @@
+/*
+ * Copyright (C) 2011 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.android.inputmethod.keyboard;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.content.res.Resources;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.os.Message;
+import android.os.SystemClock;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.GestureDetector;
+import android.view.LayoutInflater;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewConfiguration;
+import android.view.accessibility.AccessibilityEvent;
+import android.widget.PopupWindow;
+
+import com.android.inputmethod.accessibility.AccessibilityUtils;
+import com.android.inputmethod.accessibility.AccessibleKeyboardViewProxy;
+import com.android.inputmethod.deprecated.VoiceProxy;
+import com.android.inputmethod.keyboard.PointerTracker.DrawingProxy;
+import com.android.inputmethod.keyboard.PointerTracker.TimerProxy;
+import com.android.inputmethod.latin.LatinIME;
+import com.android.inputmethod.latin.R;
+import com.android.inputmethod.latin.StaticInnerHandlerWrapper;
+import com.android.inputmethod.latin.Utils;
+
+import java.util.WeakHashMap;
+
+/**
+ * A view that is responsible for detecting key presses and touch movements.
+ *
+ * @attr ref R.styleable#KeyboardView_keyHysteresisDistance
+ * @attr ref R.styleable#KeyboardView_verticalCorrection
+ * @attr ref R.styleable#KeyboardView_popupLayout
+ */
+public class LatinKeyboardView extends KeyboardView implements PointerTracker.KeyEventHandler,
+        SuddenJumpingTouchEventHandler.ProcessMotionEvent {
+    private static final String TAG = LatinKeyboardView.class.getSimpleName();
+
+    private static final boolean ENABLE_CAPSLOCK_BY_DOUBLETAP = true;
+
+    private final SuddenJumpingTouchEventHandler mTouchScreenRegulator;
+
+    // Timing constants
+    private final int mKeyRepeatInterval;
+
+    // XML attribute
+    private final float mVerticalCorrection;
+    private final int mPopupLayout;
+
+    // Mini keyboard
+    private PopupWindow mPopupWindow;
+    private PopupPanel mPopupPanel;
+    private int mPopupPanelPointerTrackerId;
+    private final WeakHashMap<Key, PopupPanel> mPopupPanelCache =
+            new WeakHashMap<Key, PopupPanel>();
+
+    /** Listener for {@link KeyboardActionListener}. */
+    private KeyboardActionListener mKeyboardActionListener;
+
+    private final boolean mHasDistinctMultitouch;
+    private int mOldPointerCount = 1;
+    private int mOldKeyIndex;
+
+    protected KeyDetector mKeyDetector;
+
+    // To detect double tap.
+    protected GestureDetector mGestureDetector;
+
+    private final KeyTimerHandler mKeyTimerHandler = new KeyTimerHandler(this);
+
+    private static class KeyTimerHandler extends StaticInnerHandlerWrapper<LatinKeyboardView>
+            implements TimerProxy {
+        private static final int MSG_REPEAT_KEY = 1;
+        private static final int MSG_LONGPRESS_KEY = 2;
+        private static final int MSG_IGNORE_DOUBLE_TAP = 3;
+
+        private boolean mInKeyRepeat;
+
+        public KeyTimerHandler(LatinKeyboardView outerInstance) {
+            super(outerInstance);
+        }
+
+        @Override
+        public void handleMessage(Message msg) {
+            final LatinKeyboardView keyboardView = getOuterInstance();
+            final PointerTracker tracker = (PointerTracker) msg.obj;
+            switch (msg.what) {
+            case MSG_REPEAT_KEY:
+                tracker.onRepeatKey(msg.arg1);
+                startKeyRepeatTimer(keyboardView.mKeyRepeatInterval, msg.arg1, tracker);
+                break;
+            case MSG_LONGPRESS_KEY:
+                keyboardView.openMiniKeyboardIfRequired(msg.arg1, tracker);
+                break;
+            }
+        }
+
+        @Override
+        public void startKeyRepeatTimer(long delay, int keyIndex, PointerTracker tracker) {
+            mInKeyRepeat = true;
+            sendMessageDelayed(obtainMessage(MSG_REPEAT_KEY, keyIndex, 0, tracker), delay);
+        }
+
+        public void cancelKeyRepeatTimer() {
+            mInKeyRepeat = false;
+            removeMessages(MSG_REPEAT_KEY);
+        }
+
+        public boolean isInKeyRepeat() {
+            return mInKeyRepeat;
+        }
+
+        @Override
+        public void startLongPressTimer(long delay, int keyIndex, PointerTracker tracker) {
+            cancelLongPressTimer();
+            sendMessageDelayed(obtainMessage(MSG_LONGPRESS_KEY, keyIndex, 0, tracker), delay);
+        }
+
+        @Override
+        public void cancelLongPressTimer() {
+            removeMessages(MSG_LONGPRESS_KEY);
+        }
+
+        @Override
+        public void cancelKeyTimers() {
+            cancelKeyRepeatTimer();
+            cancelLongPressTimer();
+            removeMessages(MSG_IGNORE_DOUBLE_TAP);
+        }
+
+        public void startIgnoringDoubleTap() {
+            sendMessageDelayed(obtainMessage(MSG_IGNORE_DOUBLE_TAP),
+                    ViewConfiguration.getDoubleTapTimeout());
+        }
+
+        public boolean isIgnoringDoubleTap() {
+            return hasMessages(MSG_IGNORE_DOUBLE_TAP);
+        }
+
+        public void cancelAllMessages() {
+            cancelKeyTimers();
+        }
+    }
+
+    private class DoubleTapListener extends GestureDetector.SimpleOnGestureListener {
+        private boolean mProcessingShiftDoubleTapEvent = false;
+
+        @Override
+        public boolean onDoubleTap(MotionEvent firstDown) {
+            final Keyboard keyboard = getKeyboard();
+            if (ENABLE_CAPSLOCK_BY_DOUBLETAP && keyboard instanceof LatinKeyboard
+                    && ((LatinKeyboard) keyboard).isAlphaKeyboard()) {
+                final int pointerIndex = firstDown.getActionIndex();
+                final int id = firstDown.getPointerId(pointerIndex);
+                final PointerTracker tracker = getPointerTracker(id);
+                // If the first down event is on shift key.
+                if (tracker.isOnShiftKey((int) firstDown.getX(), (int) firstDown.getY())) {
+                    mProcessingShiftDoubleTapEvent = true;
+                    return true;
+                }
+            }
+            mProcessingShiftDoubleTapEvent = false;
+            return false;
+        }
+
+        @Override
+        public boolean onDoubleTapEvent(MotionEvent secondTap) {
+            if (mProcessingShiftDoubleTapEvent
+                    && secondTap.getAction() == MotionEvent.ACTION_DOWN) {
+                final MotionEvent secondDown = secondTap;
+                final int pointerIndex = secondDown.getActionIndex();
+                final int id = secondDown.getPointerId(pointerIndex);
+                final PointerTracker tracker = getPointerTracker(id);
+                // If the second down event is also on shift key.
+                if (tracker.isOnShiftKey((int) secondDown.getX(), (int) secondDown.getY())) {
+                    // Detected a double tap on shift key. If we are in the ignoring double tap
+                    // mode, it means we have already turned off caps lock in
+                    // {@link KeyboardSwitcher#onReleaseShift} .
+                    final boolean ignoringDoubleTap = mKeyTimerHandler.isIgnoringDoubleTap();
+                    if (!ignoringDoubleTap)
+                        onDoubleTapShiftKey(tracker);
+                    return true;
+                }
+                // Otherwise these events should not be handled as double tap.
+                mProcessingShiftDoubleTapEvent = false;
+            }
+            return mProcessingShiftDoubleTapEvent;
+        }
+    }
+
+    public LatinKeyboardView(Context context, AttributeSet attrs) {
+        this(context, attrs, R.attr.keyboardViewStyle);
+    }
+
+    public LatinKeyboardView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+
+        mTouchScreenRegulator = new SuddenJumpingTouchEventHandler(getContext(), this);
+
+        final TypedArray a = context.obtainStyledAttributes(
+                attrs, R.styleable.KeyboardView, defStyle, R.style.KeyboardView);
+        mVerticalCorrection = a.getDimensionPixelOffset(
+                R.styleable.KeyboardView_verticalCorrection, 0);
+        mPopupLayout = a.getResourceId(R.styleable.KeyboardView_popupLayout, 0);
+        a.recycle();
+
+        final Resources res = getResources();
+        final float keyHysteresisDistance = res.getDimension(R.dimen.key_hysteresis_distance);
+        mKeyDetector = new KeyDetector(keyHysteresisDistance);
+
+        final boolean ignoreMultitouch = true;
+        mGestureDetector = new GestureDetector(
+                getContext(), new DoubleTapListener(), null, ignoreMultitouch);
+        mGestureDetector.setIsLongpressEnabled(false);
+
+        mHasDistinctMultitouch = context.getPackageManager()
+                .hasSystemFeature(PackageManager.FEATURE_TOUCHSCREEN_MULTITOUCH_DISTINCT);
+        mKeyRepeatInterval = res.getInteger(R.integer.config_key_repeat_interval);
+
+        PointerTracker.init(mHasDistinctMultitouch, getContext());
+    }
+
+    public void startIgnoringDoubleTap() {
+        if (ENABLE_CAPSLOCK_BY_DOUBLETAP)
+            mKeyTimerHandler.startIgnoringDoubleTap();
+    }
+
+    public void setKeyboardActionListener(KeyboardActionListener listener) {
+        mKeyboardActionListener = listener;
+        PointerTracker.setKeyboardActionListener(listener);
+    }
+
+    /**
+     * Returns the {@link KeyboardActionListener} object.
+     * @return the listener attached to this keyboard
+     */
+    @Override
+    public KeyboardActionListener getKeyboardActionListener() {
+        return mKeyboardActionListener;
+    }
+
+    @Override
+    public KeyDetector getKeyDetector() {
+        return mKeyDetector;
+    }
+
+    @Override
+    public DrawingProxy getDrawingProxy() {
+        return this;
+    }
+
+    @Override
+    public TimerProxy getTimerProxy() {
+        return mKeyTimerHandler;
+    }
+
+    @Override
+    public void setKeyPreviewPopupEnabled(boolean previewEnabled, int delay) {
+        final Keyboard keyboard = getKeyboard();
+        if (keyboard instanceof LatinKeyboard) {
+            final LatinKeyboard latinKeyboard = (LatinKeyboard)keyboard;
+            if (latinKeyboard.isPhoneKeyboard() || latinKeyboard.isNumberKeyboard()) {
+                // Phone and number keyboard never shows popup preview.
+                super.setKeyPreviewPopupEnabled(false, delay);
+                return;
+            }
+        }
+        super.setKeyPreviewPopupEnabled(previewEnabled, delay);
+    }
+
+    /**
+     * Attaches a keyboard to this view. The keyboard can be switched at any time and the
+     * view will re-layout itself to accommodate the keyboard.
+     * @see Keyboard
+     * @see #getKeyboard()
+     * @param keyboard the keyboard to display in this view
+     */
+    @Override
+    public void setKeyboard(Keyboard keyboard) {
+        // Remove any pending messages, except dismissing preview
+        mKeyTimerHandler.cancelKeyTimers();
+        super.setKeyboard(keyboard);
+        mKeyDetector.setKeyboard(
+                keyboard, -getPaddingLeft(), -getPaddingTop() + mVerticalCorrection);
+        mKeyDetector.setProximityThreshold(keyboard.mMostCommonKeyWidth);
+        PointerTracker.setKeyDetector(mKeyDetector);
+        mTouchScreenRegulator.setKeyboard(keyboard);
+        mPopupPanelCache.clear();
+    }
+
+    /**
+     * Returns whether the device has distinct multi-touch panel.
+     * @return true if the device has distinct multi-touch panel.
+     */
+    public boolean hasDistinctMultitouch() {
+        return mHasDistinctMultitouch;
+    }
+
+    /**
+     * When enabled, calls to {@link KeyboardActionListener#onCodeInput} will include key
+     * codes for adjacent keys.  When disabled, only the primary key code will be
+     * reported.
+     * @param enabled whether or not the proximity correction is enabled
+     */
+    public void setProximityCorrectionEnabled(boolean enabled) {
+        mKeyDetector.setProximityCorrectionEnabled(enabled);
+    }
+
+    /**
+     * Returns true if proximity correction is enabled.
+     */
+    public boolean isProximityCorrectionEnabled() {
+        return mKeyDetector.isProximityCorrectionEnabled();
+    }
+
+    @Override
+    public void cancelAllMessages() {
+        mKeyTimerHandler.cancelAllMessages();
+        super.cancelAllMessages();
+    }
+
+    private boolean openMiniKeyboardIfRequired(int keyIndex, PointerTracker tracker) {
+        // Check if we have a popup layout specified first.
+        if (mPopupLayout == 0) {
+            return false;
+        }
+
+        // Check if we are already displaying popup panel.
+        if (mPopupPanel != null)
+            return false;
+        final Key parentKey = tracker.getKey(keyIndex);
+        if (parentKey == null)
+            return false;
+        return onLongPress(parentKey, tracker);
+    }
+
+    private void onDoubleTapShiftKey(@SuppressWarnings("unused") PointerTracker tracker) {
+        // When shift key is double tapped, the first tap is correctly processed as usual tap. And
+        // the second tap is treated as this double tap event, so that we need not mark tracker
+        // calling setAlreadyProcessed() nor remove the tracker from mPointerQueue.
+        mKeyboardActionListener.onCodeInput(Keyboard.CODE_CAPSLOCK, null, 0, 0);
+    }
+
+    // This default implementation returns a popup mini keyboard panel.
+    protected PopupPanel onCreatePopupPanel(Key parentKey) {
+        if (parentKey.mPopupCharacters == null)
+            return null;
+
+        final View container = LayoutInflater.from(getContext()).inflate(mPopupLayout, null);
+        if (container == null)
+            throw new NullPointerException();
+
+        final PopupMiniKeyboardView miniKeyboardView =
+                (PopupMiniKeyboardView)container.findViewById(R.id.mini_keyboard_view);
+        final Keyboard parentKeyboard = getKeyboard();
+        final Keyboard miniKeyboard = new MiniKeyboard.Builder(
+                this, parentKeyboard.mPopupKeyboardResId, parentKey, parentKeyboard).build();
+        miniKeyboardView.setKeyboard(miniKeyboard);
+
+        container.measure(MeasureSpec.makeMeasureSpec(getWidth(), MeasureSpec.AT_MOST),
+                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
+
+        return miniKeyboardView;
+    }
+
+    @Override
+    protected boolean needsToDimKeyboard() {
+        return mPopupPanel != null;
+    }
+
+    public void setSpacebarTextFadeFactor(float fadeFactor, LatinKeyboard oldKeyboard) {
+        final Keyboard keyboard = getKeyboard();
+        // We should not set text fade factor to the keyboard which does not display the language on
+        // its spacebar.
+        if (keyboard instanceof LatinKeyboard && keyboard == oldKeyboard) {
+            ((LatinKeyboard)keyboard).setSpacebarTextFadeFactor(fadeFactor, this);
+        }
+    }
+
+    /**
+     * Called when a key is long pressed. By default this will open mini keyboard associated
+     * with this key.
+     * @param parentKey the key that was long pressed
+     * @param tracker the pointer tracker which pressed the parent key
+     * @return true if the long press is handled, false otherwise. Subclasses should call the
+     * method on the base class if the subclass doesn't wish to handle the call.
+     */
+    protected boolean onLongPress(Key parentKey, PointerTracker tracker) {
+        final int primaryCode = parentKey.mCode;
+        final Keyboard keyboard = getKeyboard();
+        if (keyboard instanceof LatinKeyboard) {
+            final LatinKeyboard latinKeyboard = (LatinKeyboard) keyboard;
+            if (primaryCode == Keyboard.CODE_DIGIT0 && latinKeyboard.isPhoneKeyboard()) {
+                tracker.onLongPressed();
+                // Long pressing on 0 in phone number keypad gives you a '+'.
+                return invokeOnKey(Keyboard.CODE_PLUS);
+            }
+            if (primaryCode == Keyboard.CODE_SHIFT && latinKeyboard.isAlphaKeyboard()) {
+                tracker.onLongPressed();
+                return invokeOnKey(Keyboard.CODE_CAPSLOCK);
+            }
+        }
+        if (primaryCode == Keyboard.CODE_SETTINGS || primaryCode == Keyboard.CODE_SPACE) {
+            // Both long pressing settings key and space key invoke IME switcher dialog.
+            if (getKeyboardActionListener().onCustomRequest(
+                    LatinIME.CODE_SHOW_INPUT_METHOD_PICKER)) {
+                tracker.onLongPressed();
+                return true;
+            } else {
+                return openPopupPanel(parentKey, tracker);
+            }
+        } else {
+            return openPopupPanel(parentKey, tracker);
+        }
+    }
+
+    private boolean invokeOnKey(int primaryCode) {
+        getKeyboardActionListener().onCodeInput(primaryCode, null,
+                KeyboardActionListener.NOT_A_TOUCH_COORDINATE,
+                KeyboardActionListener.NOT_A_TOUCH_COORDINATE);
+        return true;
+    }
+
+    private boolean openPopupPanel(Key parentKey, PointerTracker tracker) {
+        PopupPanel popupPanel = mPopupPanelCache.get(parentKey);
+        if (popupPanel == null) {
+            popupPanel = onCreatePopupPanel(parentKey);
+            if (popupPanel == null)
+                return false;
+            mPopupPanelCache.put(parentKey, popupPanel);
+        }
+        if (mPopupWindow == null) {
+            mPopupWindow = new PopupWindow(getContext());
+            mPopupWindow.setBackgroundDrawable(null);
+            mPopupWindow.setAnimationStyle(R.style.PopupMiniKeyboardAnimation);
+            // Allow popup window to be drawn off the screen.
+            mPopupWindow.setClippingEnabled(false);
+        }
+        mPopupPanel = popupPanel;
+        mPopupPanelPointerTrackerId = tracker.mPointerId;
+
+        popupPanel.showPopupPanel(this, parentKey, tracker, mPopupWindow);
+        final int translatedX = popupPanel.translateX(tracker.getLastX());
+        final int translatedY = popupPanel.translateY(tracker.getLastY());
+        tracker.onShowPopupPanel(translatedX, translatedY, SystemClock.uptimeMillis(), popupPanel);
+
+        invalidateAllKeys();
+        return true;
+    }
+
+    private PointerTracker getPointerTracker(final int id) {
+        return PointerTracker.getPointerTracker(id, this);
+    }
+
+    public boolean isInSlidingKeyInput() {
+        if (mPopupPanel != null) {
+            return true;
+        } else {
+            return PointerTracker.isAnyInSlidingKeyInput();
+        }
+    }
+
+    public int getPointerCount() {
+        return mOldPointerCount;
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent me) {
+        return mTouchScreenRegulator.onTouchEvent(me);
+    }
+
+    @Override
+    public boolean processMotionEvent(MotionEvent me) {
+        final boolean nonDistinctMultitouch = !mHasDistinctMultitouch;
+        final int action = me.getActionMasked();
+        final int pointerCount = me.getPointerCount();
+        final int oldPointerCount = mOldPointerCount;
+        mOldPointerCount = pointerCount;
+
+        // TODO: cleanup this code into a multi-touch to single-touch event converter class?
+        // If the device does not have distinct multi-touch support panel, ignore all multi-touch
+        // events except a transition from/to single-touch.
+        if (nonDistinctMultitouch && pointerCount > 1 && oldPointerCount > 1) {
+            return true;
+        }
+
+        // Gesture detector must be enabled only when mini-keyboard is not on the screen.
+        if (mPopupPanel == null && mGestureDetector != null
+                && mGestureDetector.onTouchEvent(me)) {
+            PointerTracker.dismissAllKeyPreviews();
+            mKeyTimerHandler.cancelKeyTimers();
+            return true;
+        }
+
+        final long eventTime = me.getEventTime();
+        final int index = me.getActionIndex();
+        final int id = me.getPointerId(index);
+        final int x, y;
+        if (mPopupPanel != null && id == mPopupPanelPointerTrackerId) {
+            x = mPopupPanel.translateX((int)me.getX(index));
+            y = mPopupPanel.translateY((int)me.getY(index));
+        } else {
+            x = (int)me.getX(index);
+            y = (int)me.getY(index);
+        }
+
+        if (mKeyTimerHandler.isInKeyRepeat()) {
+            final PointerTracker tracker = getPointerTracker(id);
+            // Key repeating timer will be canceled if 2 or more keys are in action, and current
+            // event (UP or DOWN) is non-modifier key.
+            if (pointerCount > 1 && !tracker.isModifier()) {
+                mKeyTimerHandler.cancelKeyRepeatTimer();
+            }
+            // Up event will pass through.
+        }
+
+        // TODO: cleanup this code into a multi-touch to single-touch event converter class?
+        // Translate mutli-touch event to single-touch events on the device that has no distinct
+        // multi-touch panel.
+        if (nonDistinctMultitouch) {
+            // Use only main (id=0) pointer tracker.
+            PointerTracker tracker = getPointerTracker(0);
+            if (pointerCount == 1 && oldPointerCount == 2) {
+                // Multi-touch to single touch transition.
+                // Send a down event for the latest pointer if the key is different from the
+                // previous key.
+                final int newKeyIndex = tracker.getKeyIndexOn(x, y);
+                if (mOldKeyIndex != newKeyIndex) {
+                    tracker.onDownEvent(x, y, eventTime, this);
+                    if (action == MotionEvent.ACTION_UP)
+                        tracker.onUpEvent(x, y, eventTime);
+                }
+            } else if (pointerCount == 2 && oldPointerCount == 1) {
+                // Single-touch to multi-touch transition.
+                // Send an up event for the last pointer.
+                final int lastX = tracker.getLastX();
+                final int lastY = tracker.getLastY();
+                mOldKeyIndex = tracker.getKeyIndexOn(lastX, lastY);
+                tracker.onUpEvent(lastX, lastY, eventTime);
+            } else if (pointerCount == 1 && oldPointerCount == 1) {
+                processMotionEvent(tracker, action, x, y, eventTime, this);
+            } else {
+                Log.w(TAG, "Unknown touch panel behavior: pointer count is " + pointerCount
+                        + " (old " + oldPointerCount + ")");
+            }
+            return true;
+        }
+
+        if (action == MotionEvent.ACTION_MOVE) {
+            for (int i = 0; i < pointerCount; i++) {
+                final PointerTracker tracker = getPointerTracker(me.getPointerId(i));
+                final int px, py;
+                if (mPopupPanel != null && tracker.mPointerId == mPopupPanelPointerTrackerId) {
+                    px = mPopupPanel.translateX((int)me.getX(i));
+                    py = mPopupPanel.translateY((int)me.getY(i));
+                } else {
+                    px = (int)me.getX(i);
+                    py = (int)me.getY(i);
+                }
+                tracker.onMoveEvent(px, py, eventTime);
+            }
+        } else {
+            processMotionEvent(getPointerTracker(id), action, x, y, eventTime, this);
+        }
+
+        return true;
+    }
+
+    private static void processMotionEvent(PointerTracker tracker, int action, int x, int y,
+            long eventTime, PointerTracker.KeyEventHandler handler) {
+        switch (action) {
+        case MotionEvent.ACTION_DOWN:
+        case MotionEvent.ACTION_POINTER_DOWN:
+            tracker.onDownEvent(x, y, eventTime, handler);
+            break;
+        case MotionEvent.ACTION_UP:
+        case MotionEvent.ACTION_POINTER_UP:
+            tracker.onUpEvent(x, y, eventTime);
+            break;
+        case MotionEvent.ACTION_MOVE:
+            tracker.onMoveEvent(x, y, eventTime);
+            break;
+        case MotionEvent.ACTION_CANCEL:
+            tracker.onCancelEvent(x, y, eventTime);
+            break;
+        }
+    }
+
+    @Override
+    public void closing() {
+        super.closing();
+        dismissPopupPanel();
+        mPopupPanelCache.clear();
+    }
+
+    @Override
+    public boolean dismissPopupPanel() {
+        if (mPopupWindow != null && mPopupWindow.isShowing()) {
+            mPopupWindow.dismiss();
+            mPopupPanel = null;
+            mPopupPanelPointerTrackerId = -1;
+            invalidateAllKeys();
+            return true;
+        }
+        return false;
+    }
+
+    public boolean handleBack() {
+        return dismissPopupPanel();
+    }
+
+    @Override
+    public void draw(Canvas c) {
+        Utils.GCUtils.getInstance().reset();
+        boolean tryGC = true;
+        for (int i = 0; i < Utils.GCUtils.GC_TRY_LOOP_MAX && tryGC; ++i) {
+            try {
+                super.draw(c);
+                tryGC = false;
+            } catch (OutOfMemoryError e) {
+                tryGC = Utils.GCUtils.getInstance().tryGCOrWait("LatinKeyboardView", e);
+            }
+        }
+    }
+
+    @Override
+    protected void onAttachedToWindow() {
+        // Token is available from here.
+        VoiceProxy.getInstance().onAttachedToWindow();
+    }
+
+    @Override
+    public boolean dispatchTouchEvent(MotionEvent event) {
+        // Drop non-hover touch events when touch exploration is enabled.
+        if (AccessibilityUtils.getInstance().isTouchExplorationEnabled()) {
+            return false;
+        }
+
+        return super.dispatchTouchEvent(event);
+    }
+
+    @Override
+    public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
+        if (AccessibilityUtils.getInstance().isTouchExplorationEnabled()) {
+            final PointerTracker tracker = getPointerTracker(0);
+            return AccessibleKeyboardViewProxy.getInstance().dispatchPopulateAccessibilityEvent(
+                    event, tracker) || super.dispatchPopulateAccessibilityEvent(event);
+        }
+
+        return super.dispatchPopulateAccessibilityEvent(event);
+    }
+
+    /**
+     * Receives hover events from the input framework. This method overrides
+     * View.dispatchHoverEvent(MotionEvent) on SDK version ICS or higher. On
+     * lower SDK versions, this method is never called.
+     *
+     * @param event The motion event to be dispatched.
+     * @return {@code true} if the event was handled by the view, {@code false}
+     *         otherwise
+     */
+    public boolean dispatchHoverEvent(MotionEvent event) {
+        if (AccessibilityUtils.getInstance().isTouchExplorationEnabled()) {
+            final PointerTracker tracker = getPointerTracker(0);
+            return AccessibleKeyboardViewProxy.getInstance().dispatchHoverEvent(event, tracker);
+        }
+
+        // Reflection doesn't support calling superclass methods.
+        return false;
+    }
+}