Added support for touch exploration to Latin IME.

    <!-- Label for "Wait" key of phone number keyboard.  Must be short to fit on key! [CHAR LIMIT=5]-->

    <string name="label_wait_key">Wait</string>

    <!-- Spoken description for the currently entered text -->

    <string name="spoken_current_text_is">Current text is "%s"</string>

    <!-- Spoken description when there is no text entered -->

    <string name="spoken_no_text_entered">No text entered</string>

    <!-- Spoken description for unknown keyboard keys. -->

    <string name="spoken_description_unknown">Key code %d</string>

    <!-- Spoken description for the "Shift" keyboard key. -->

    <string name="spoken_description_shift">Shift</string>

    <!-- Spoken description for the "Shift" keyboard key's pressed state. -->

    <string name="spoken_description_shift_shifted">Shift enabled</string>

    <!-- Spoken description for the "Shift" keyboard key's pressed state. -->

    <string name="spoken_description_caps_lock">Caps lock enabled</string>

    <!-- Spoken description for the "Delete" keyboard key. -->

    <string name="spoken_description_delete">Delete</string>

    <!-- Spoken description for the "To Symbol" keyboard key. -->

    <string name="spoken_description_to_symbol">Symbols</string>

    <!-- Spoken description for the "To Alpha" keyboard key. -->

    <string name="spoken_description_to_alpha">Letters</string>

    <!-- Spoken description for the "To Numbers" keyboard key. -->

    <string name="spoken_description_to_numeric">Numbers</string>

    <!-- Spoken description for the "Settings" keyboard key. -->

    <string name="spoken_description_settings">Settings</string>

    <!-- Spoken description for the "Tab" keyboard key. -->

    <string name="spoken_description_tab">Tab</string>

    <!-- Spoken description for the "Space" keyboard key. -->

    <string name="spoken_description_space">Space</string>

    <!-- Spoken description for the "Mic" keyboard key. -->

    <string name="spoken_description_mic">Voice input</string>

    <!-- Spoken description for the "Smiley" keyboard key. -->

    <string name="spoken_description_smiley">Smiley face</string>

    <!-- Spoken description for the "Return" keyboard key. -->

    <string name="spoken_description_return">Return</string>

    <!-- Spoken description for the "," keyboard key. -->

    <string name="spoken_description_comma">Comma</string>

    <!-- Spoken description for the "." keyboard key. -->

    <string name="spoken_description_period">Period</string>

    <!-- Spoken description for the "(" keyboard key. -->

    <string name="spoken_description_left_parenthesis">Left parenthesis</string>

    <!-- Spoken description for the ")" keyboard key. -->

    <string name="spoken_description_right_parenthesis">Right parenthesis</string>

    <!-- Spoken description for the ":" keyboard key. -->

    <string name="spoken_description_colon">Colon</string>

    <!-- Spoken description for the ";" keyboard key. -->

    <string name="spoken_description_semicolon">Semicolon</string>

    <!-- Spoken description for the "!" keyboard key. -->

    <string name="spoken_description_exclamation_mark">Exclamation mark</string>

    <!-- Spoken description for the "?" keyboard key. -->

    <string name="spoken_description_question_mark">Question mark</string>

    <!-- Spoken description for the """ keyboard key. -->

    <string name="spoken_description_double_quote">Double quote</string>

    <!-- Spoken description for the "'" keyboard key. -->

    <string name="spoken_description_single_quote">Single quote</string>

    <!-- Spoken description for the "•" keyboard key. -->

    <string name="spoken_description_dot">Dot</string>

    <!-- Spoken description for the "√" keyboard key. -->

    <string name="spoken_description_square_root">Square root</string>

    <!-- Spoken description for the "π" keyboard key. -->

    <string name="spoken_description_pi">Pi</string>

    <!-- Spoken description for the "Δ" keyboard key. -->

    <string name="spoken_description_delta">Delta</string>

    <!-- Spoken description for the "™" keyboard key. -->

    <string name="spoken_description_trademark">Trademark</string>

    <!-- Spoken description for the "℅" keyboard key. -->

    <string name="spoken_description_care_of">Care of</string>

    <!-- Spoken description for the "*" keyboard key. -->

    <string name="spoken_description_star">Star</string>

    <!-- Spoken description for the "#" keyboard key. -->

    <string name="spoken_description_pound">Pound</string>

    <!-- Spoken description for the "…" keyboard key. -->

    <string name="spoken_description_ellipsis">Ellipsis</string>

    <!-- Spoken description for the "„" keyboard key. -->

    <string name="spoken_description_low_double_quote">Low double quote</string>

    <!-- Voice related labels -->

    <!-- Title of the warning dialog that shows when a user initiates voice input for

/*

 * 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.accessibility;

import android.accessibilityservice.AccessibilityServiceInfo;

import android.content.Context;

import android.content.SharedPreferences;

import android.inputmethodservice.InputMethodService;

import android.os.SystemClock;

import android.util.Log;

import android.view.MotionEvent;

import android.view.accessibility.AccessibilityEvent;

import android.view.accessibility.AccessibilityManager;

import com.android.inputmethod.compat.AccessibilityEventCompatUtils;

import com.android.inputmethod.compat.AccessibilityManagerCompatWrapper;

import com.android.inputmethod.compat.MotionEventCompatUtils;

public class AccessibilityUtils {

    private static final String TAG = AccessibilityUtils.class.getSimpleName();

    private static final String CLASS = AccessibilityUtils.class.getClass().getName();

    private static final String PACKAGE = AccessibilityUtils.class.getClass().getPackage()

            .getName();

    private static final AccessibilityUtils sInstance = new AccessibilityUtils();

    private AccessibilityManager mAccessibilityManager;

    private AccessibilityManagerCompatWrapper mCompatManager;

    /*

     * Setting this constant to {@code false} will disable all keyboard

     * accessibility code, regardless of whether Accessibility is turned on in

     * the system settings. It should ONLY be used in the event of an emergency.

     */

    private static final boolean ENABLE_ACCESSIBILITY = true;

    public static void init(InputMethodService inputMethod, SharedPreferences prefs) {

        if (!ENABLE_ACCESSIBILITY)

            return;

        // These only need to be initialized if the kill switch is off.

        sInstance.initInternal(inputMethod, prefs);

        KeyCodeDescriptionMapper.init(inputMethod, prefs);

        AccessibleInputMethodServiceProxy.init(inputMethod, prefs);

        AccessibleKeyboardViewProxy.init(inputMethod, prefs);

    }

    public static AccessibilityUtils getInstance() {

        return sInstance;

    }

    private AccessibilityUtils() {

        // This class is not publicly instantiable.

    }

    private void initInternal(Context context, SharedPreferences prefs) {

        mAccessibilityManager = (AccessibilityManager) context

                .getSystemService(Context.ACCESSIBILITY_SERVICE);

        mCompatManager = new AccessibilityManagerCompatWrapper(mAccessibilityManager);

    }

    /**

     * Returns {@code true} if touch exploration is enabled. Currently, this

     * means that the kill switch is off, the device supports touch exploration,

     * and a spoken feedback service is turned on.

     *

     * @return {@code true} if touch exploration is enabled.

     */

    public boolean isTouchExplorationEnabled() {

        return ENABLE_ACCESSIBILITY

                && AccessibilityEventCompatUtils.supportsTouchExploration()

                && mAccessibilityManager.isEnabled()

                && !mCompatManager.getEnabledAccessibilityServiceList(

                        AccessibilityServiceInfo.FEEDBACK_SPOKEN).isEmpty();

    }

    /**

     * Returns {@true} if the provided event is a touch exploration (e.g. hover)

     * event. This is used to determine whether the event should be processed by

     * the touch exploration code within the keyboard.

     *

     * @param event The event to check.

     * @return {@true} is the event is a touch exploration event

     */

    public boolean isTouchExplorationEvent(MotionEvent event) {

        final int action = event.getAction();

        return action == MotionEventCompatUtils.ACTION_HOVER_ENTER

                || action == MotionEventCompatUtils.ACTION_HOVER_EXIT

                || action == MotionEventCompatUtils.ACTION_HOVER_MOVE;

    }

    /**

     * Sends the specified text to the {@link AccessibilityManager} to be

     * spoken.

     *

     * @param text the text to speak

     */

    public void speak(CharSequence text) {

        if (!mAccessibilityManager.isEnabled()) {

            Log.e(TAG, "Attempted to speak when accessibility was disabled!");

            return;

        }

        // The following is a hack to avoid using the heavy-weight TextToSpeech

        // class. Instead, we're just forcing a fake AccessibilityEvent into

        // the screen reader to make it speak.

        final AccessibilityEvent event = AccessibilityEvent

                .obtain(AccessibilityEventCompatUtils.TYPE_VIEW_HOVER_ENTER);

        event.setPackageName(PACKAGE);

        event.setClassName(CLASS);

        event.setEventTime(SystemClock.uptimeMillis());

        event.setEnabled(true);

        event.getText().add(text);

        mAccessibilityManager.sendAccessibilityEvent(event);

    }

}

/*

 * 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.accessibility;

import android.content.SharedPreferences;

import android.inputmethodservice.InputMethodService;

import android.os.Handler;

import android.os.Looper;

import android.os.Message;

import android.text.TextUtils;

import android.view.inputmethod.ExtractedText;

import android.view.inputmethod.ExtractedTextRequest;

import com.android.inputmethod.latin.R;

public class AccessibleInputMethodServiceProxy implements AccessibleKeyboardActionListener {

    private static final AccessibleInputMethodServiceProxy sInstance =

            new AccessibleInputMethodServiceProxy();

    /*

     * Delay for the handler event that's fired when Accessibility is on and the

     * user hovers outside of any valid keys. This is used to let the user know

     * that if they lift their finger, nothing will be typed.

     */

    private static final long DELAY_NO_HOVER_SELECTION = 250;

    private InputMethodService mInputMethod;

    private AccessibilityHandler mAccessibilityHandler;

    private class AccessibilityHandler extends Handler {

        private static final int MSG_NO_HOVER_SELECTION = 0;

        public AccessibilityHandler(Looper looper) {

            super(looper);

        }

        @Override

        public void handleMessage(Message msg) {

            switch (msg.what) {

            case MSG_NO_HOVER_SELECTION:

                notifyNoHoverSelection();

                break;

            }

        }

        public void postNoHoverSelection() {

            removeMessages(MSG_NO_HOVER_SELECTION);

            sendEmptyMessageDelayed(MSG_NO_HOVER_SELECTION, DELAY_NO_HOVER_SELECTION);

        }

        public void cancelNoHoverSelection() {

            removeMessages(MSG_NO_HOVER_SELECTION);

        }

    }

    public static void init(InputMethodService inputMethod, SharedPreferences prefs) {

        sInstance.initInternal(inputMethod, prefs);

    }

    public static AccessibleInputMethodServiceProxy getInstance() {

        return sInstance;

    }

    private AccessibleInputMethodServiceProxy() {

        // Not publicly instantiable.

    }

    private void initInternal(InputMethodService inputMethod, SharedPreferences prefs) {

        mInputMethod = inputMethod;

        mAccessibilityHandler = new AccessibilityHandler(inputMethod.getMainLooper());

    }

    /**

     * If touch exploration is enabled, cancels the event sent by

     * {@link AccessibleInputMethodServiceProxy#onHoverExit(int)} because the

     * user is currently hovering above a key.

     */

    @Override

    public void onHoverEnter(int primaryCode) {

        mAccessibilityHandler.cancelNoHoverSelection();

    }

    /**

     * If touch exploration is enabled, sends a delayed event to notify the user

     * that they are not currently hovering above a key.

     */

    @Override

    public void onHoverExit(int primaryCode) {

        mAccessibilityHandler.postNoHoverSelection();

    }

    /**

     * When Accessibility is turned on, notifies the user that they are not

     * currently hovering above a key. By default this will speak the currently

     * entered text.

     */

    private void notifyNoHoverSelection() {

        final ExtractedText extracted = mInputMethod.getCurrentInputConnection().getExtractedText(

                new ExtractedTextRequest(), 0);

        if (extracted == null)

            return;

        final CharSequence text;

        if (TextUtils.isEmpty(extracted.text)) {

            text = mInputMethod.getString(R.string.spoken_no_text_entered);

        } else {

            text = mInputMethod.getString(R.string.spoken_current_text_is, extracted.text);

        }

        AccessibilityUtils.getInstance().speak(text);

    }

}

/*

 * 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.accessibility;

public interface AccessibleKeyboardActionListener {

    /**

     * Called when the user hovers inside a key. This is sent only when

     * Accessibility is turned on. For keys that repeat, this is only called

     * once.

     *

     * @param primaryCode the code of the key that was hovered over

     */

    public void onHoverEnter(int primaryCode);

    /**

     * Called when the user hovers outside a key. This is sent only when

     * Accessibility is turned on. For keys that repeat, this is only called

     * once.

     *

     * @param primaryCode the code of the key that was hovered over

     */

    public void onHoverExit(int primaryCode);

}

/*

 * 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.accessibility;

import android.content.Context;

import android.content.SharedPreferences;

import android.graphics.Color;

import android.graphics.Paint;

import android.util.Log;

import android.view.MotionEvent;

import android.view.ViewConfiguration;

import android.view.accessibility.AccessibilityEvent;

import com.android.inputmethod.compat.AccessibilityEventCompatUtils;

import com.android.inputmethod.compat.MotionEventCompatUtils;

import com.android.inputmethod.keyboard.Key;

import com.android.inputmethod.keyboard.KeyDetector;

import com.android.inputmethod.keyboard.KeyboardView;

import com.android.inputmethod.keyboard.PointerTracker;

public class AccessibleKeyboardViewProxy {

    private static final String TAG = AccessibleKeyboardViewProxy.class.getSimpleName();

    private static final AccessibleKeyboardViewProxy sInstance = new AccessibleKeyboardViewProxy();

    // Delay in milliseconds between key press DOWN and UP events

    private static final long DELAY_KEY_PRESS = 10;

    private int mScaledEdgeSlop;

    private KeyboardView mView;

    private AccessibleKeyboardActionListener mListener;

    private int mLastHoverKeyIndex = KeyDetector.NOT_A_KEY;

    private int mLastX = -1;

    private int mLastY = -1;

    public static void init(Context context, SharedPreferences prefs) {

        sInstance.initInternal(context, prefs);

        sInstance.mListener = AccessibleInputMethodServiceProxy.getInstance();

    }

    public static AccessibleKeyboardViewProxy getInstance() {

        return sInstance;

    }

    public static void setView(KeyboardView view) {

        sInstance.mView = view;

    }

    private AccessibleKeyboardViewProxy() {

        // Not publicly instantiable.

    }

    private void initInternal(Context context, SharedPreferences prefs) {

        final Paint paint = new Paint();

        paint.setTextAlign(Paint.Align.LEFT);

        paint.setTextSize(14.0f);

        paint.setAntiAlias(true);

        paint.setColor(Color.YELLOW);

        mScaledEdgeSlop = ViewConfiguration.get(context).getScaledEdgeSlop();

    }

    public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event,

            PointerTracker tracker) {

        if (mView == null) {

            Log.e(TAG, "No keyboard view set!");

            return false;

        }

        switch (event.getEventType()) {

        case AccessibilityEventCompatUtils.TYPE_VIEW_HOVER_ENTER:

            final Key key = tracker.getKey(mLastHoverKeyIndex);

            if (key == null)

                break;

            final CharSequence description = KeyCodeDescriptionMapper.getInstance()

                    .getDescriptionForKey(mView.getContext(), mView.getKeyboard(), key);

            if (description == null)

                return false;

            event.getText().add(description);

            break;

        }

        return true;

    }

    /**

     * Receives hover events when accessibility is turned on in API > 11. In

     * earlier API levels, events are manually routed from onTouchEvent.

     *

     * @param event The hover event.

     * @return {@code true} if the event is handled

     */

    public boolean onHoverEvent(MotionEvent event, PointerTracker tracker) {

        return onTouchExplorationEvent(event, tracker);

    }

    public boolean dispatchTouchEvent(MotionEvent event) {

        // Since touch exploration translates hover double-tap to a regular

        // single-tap, we're going to drop non-touch exploration events.

        if (!AccessibilityUtils.getInstance().isTouchExplorationEvent(event))

            return true;

        return false;

    }

    /**

     * Handles touch exploration events when Accessibility is turned on.

     *

     * @param event The touch exploration hover event.

     * @return {@code true} if the event was handled

     */

    private boolean onTouchExplorationEvent(MotionEvent event, PointerTracker tracker) {

        final int x = (int) event.getX();

        final int y = (int) event.getY();

        switch (event.getAction()) {

        case MotionEventCompatUtils.ACTION_HOVER_ENTER:

        case MotionEventCompatUtils.ACTION_HOVER_MOVE:

            final int keyIndex = tracker.getKeyIndexOn(x, y);

            if (keyIndex != mLastHoverKeyIndex) {

                fireKeyHoverEvent(tracker, mLastHoverKeyIndex, false);

                mLastHoverKeyIndex = keyIndex;

                mLastX = x;

                mLastY = y;

                fireKeyHoverEvent(tracker, mLastHoverKeyIndex, true);

            }

            return true;

        case MotionEventCompatUtils.ACTION_HOVER_EXIT:

            final int width = mView.getWidth();

            final int height = mView.getHeight();

            if (x < mScaledEdgeSlop || y < mScaledEdgeSlop || x >= (width - mScaledEdgeSlop)

                    || y >= (height - mScaledEdgeSlop)) {

                fireKeyHoverEvent(tracker, mLastHoverKeyIndex, false);

                mLastHoverKeyIndex = KeyDetector.NOT_A_KEY;

                mLastX = -1;

                mLastY = -1;

            } else if (mLastHoverKeyIndex != KeyDetector.NOT_A_KEY) {

                fireKeyPressEvent(tracker, mLastX, mLastY, event.getEventTime());

            }

            return true;

        }

        return false;

    }

    private void fireKeyHoverEvent(PointerTracker tracker, int keyIndex, boolean entering) {

        if (mListener == null) {

            Log.e(TAG, "No accessible keyboard action listener set!");

            return;

        }

        if (mView == null) {

            Log.e(TAG, "No keyboard view set!");

            return;

        }

        if (keyIndex == KeyDetector.NOT_A_KEY)

            return;

        final Key key = tracker.getKey(keyIndex);

        if (key == null)

            return;

        if (entering) {

            mListener.onHoverEnter(key.mCode);

            mView.sendAccessibilityEvent(AccessibilityEventCompatUtils.TYPE_VIEW_HOVER_ENTER);

        } else {

            mListener.onHoverExit(key.mCode);

            mView.sendAccessibilityEvent(AccessibilityEventCompatUtils.TYPE_VIEW_HOVER_EXIT);

        }

    }

    private void fireKeyPressEvent(PointerTracker tracker, int x, int y, long eventTime) {

        tracker.onDownEvent(x, y, eventTime, null);

        tracker.onUpEvent(x, y, eventTime + DELAY_KEY_PRESS, null);

    }

}