Added virtual view hierarchy for keyboard accessibility. (9a81ce92) · Commits · e / os / android_packages_inputmethods_LatinIME

java/Android.mk

+1 −0

Original line number	Diff line number	Diff line
		@@ -30,6 +30,7 @@ LOCAL_REQUIRED_MODULES := libjni_latinime

		LOCAL_STATIC_JAVA_LIBRARIES := android-common
		LOCAL_STATIC_JAVA_LIBRARIES += inputmethod-common
		LOCAL_STATIC_JAVA_LIBRARIES += android-support-v4

		# Do not compress dictionary files to mmap dict data runtime
		LOCAL_AAPT_FLAGS := -0 .dict

java/src/com/android/inputmethod/accessibility/AccessibilityEntityProvider.java

0 → 100644

+377 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2012 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.graphics.Rect;
		import android.inputmethodservice.InputMethodService;
		import android.support.v4.view.ViewCompat;
		import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
		import android.support.v4.view.accessibility.AccessibilityNodeProviderCompat;
		import android.support.v4.view.accessibility.AccessibilityRecordCompat;
		import android.util.Log;
		import android.util.SparseArray;
		import android.view.View;
		import android.view.ViewTreeObserver.OnGlobalLayoutListener;
		import android.view.accessibility.AccessibilityEvent;
		import android.view.inputmethod.EditorInfo;

		import com.android.inputmethod.keyboard.Key;
		import com.android.inputmethod.keyboard.Keyboard;
		import com.android.inputmethod.keyboard.KeyboardView;

		import java.util.Collections;
		import java.util.LinkedList;
		import java.util.List;
		import java.util.Set;

		/**
		* Exposes a virtual view sub-tree for {@link KeyboardView} and generates
		* {@link AccessibilityEvent}s for individual {@link Key}s.
		* <p>
		* A virtual sub-tree is composed of imaginary {@link View}s that are reported
		* as a part of the view hierarchy for accessibility purposes. This enables
		* custom views that draw complex content to report them selves as a tree of
		* virtual views, thus conveying their logical structure.
		* </p>
		*/
		public class AccessibilityEntityProvider extends AccessibilityNodeProviderCompat {
		private static final String TAG = AccessibilityEntityProvider.class.getSimpleName();

		private final KeyboardView mKeyboardView;
		private final InputMethodService mInputMethodService;
		private final KeyCodeDescriptionMapper mKeyCodeDescriptionMapper;
		private final AccessibilityUtils mAccessibilityUtils;

		/** A map of integer IDs to {@link Key}s. */
		private final SparseArray<Key> mVirtualViewIdToKey = new SparseArray<Key>();

		/** Temporary rect used to calculate in-screen bounds. */
		private final Rect mTempBoundsInScreen = new Rect();

		/** The parent view's cached on-screen location. */
		private final int[] mParentLocation = new int[2];

		public AccessibilityEntityProvider(KeyboardView keyboardView, InputMethodService inputMethod) {
		mKeyboardView = keyboardView;
		mInputMethodService = inputMethod;

		mKeyCodeDescriptionMapper = KeyCodeDescriptionMapper.getInstance();
		mAccessibilityUtils = AccessibilityUtils.getInstance();

		assignVirtualViewIds();
		updateParentLocation();

		// Ensure that the on-screen bounds are cleared when the layout changes.
		mKeyboardView.getViewTreeObserver().addOnGlobalLayoutListener(mGlobalLayoutListener);
		}

		/**
		* Creates and populates an {@link AccessibilityEvent} for the specified key
		* and event type.
		*
		* @param key A key on the host keyboard view.
		* @param eventType The event type to create.
		* @return A populated {@link AccessibilityEvent} for the key.
		* @see AccessibilityEvent
		*/
		public AccessibilityEvent createAccessibilityEvent(Key key, int eventType) {
		final int virtualViewId = generateVirtualViewIdForKey(key);
		final String keyDescription = getKeyDescription(key);

		final AccessibilityEvent event = AccessibilityEvent.obtain(eventType);
		event.setPackageName(mKeyboardView.getContext().getPackageName());
		event.setClassName(key.getClass().getName());
		event.getText().add(keyDescription);

		final AccessibilityRecordCompat record = new AccessibilityRecordCompat(event);
		record.setSource(mKeyboardView, virtualViewId);

		return event;
		}

		/**
		* Returns an {@link AccessibilityNodeInfoCompat} representing a virtual
		* view, i.e. a descendant of the host View, with the given <code>virtualViewId</code> or
		* the host View itself if <code>virtualViewId</code> equals to {@link View#NO_ID}.
		* <p>
		* A virtual descendant is an imaginary View that is reported as a part of
		* the view hierarchy for accessibility purposes. This enables custom views
		* that draw complex content to report them selves as a tree of virtual
		* views, thus conveying their logical structure.
		* </p>
		* <p>
		* The implementer is responsible for obtaining an accessibility node info
		* from the pool of reusable instances and setting the desired properties of
		* the node info before returning it.
		* </p>
		*
		* @param virtualViewId A client defined virtual view id.
		* @return A populated {@link AccessibilityNodeInfoCompat} for a virtual
		* descendant or the host View.
		* @see AccessibilityNodeInfoCompat
		*/
		@Override
		public AccessibilityNodeInfoCompat createAccessibilityNodeInfo(int virtualViewId) {
		AccessibilityNodeInfoCompat info = null;

		if (virtualViewId == View.NO_ID) {
		// We are requested to create an AccessibilityNodeInfo describing
		// this View, i.e. the root of the virtual sub-tree.
		info = AccessibilityNodeInfoCompat.obtain(mKeyboardView);
		ViewCompat.onInitializeAccessibilityNodeInfo(mKeyboardView, info);

		// Add the virtual children of the root View.
		// TODO(alanv): Need to assign a unique ID to each key.
		final Keyboard keyboard = mKeyboardView.getKeyboard();
		final Set<Key> keys = keyboard.mKeys;
		for (Key key : keys) {
		final int childVirtualViewId = generateVirtualViewIdForKey(key);
		info.addChild(mKeyboardView, childVirtualViewId);
		}
		} else {
		// Find the view that corresponds to the given id.
		final Key key = mVirtualViewIdToKey.get(virtualViewId);
		if (key == null) {
		Log.e(TAG, "Invalid virtual view ID: " + virtualViewId);
		return null;
		}

		final String keyDescription = getKeyDescription(key);
		final Rect boundsInParent = key.mHitBox;

		// Calculate the key's in-screen bounds.
		mTempBoundsInScreen.set(boundsInParent);
		mTempBoundsInScreen.offset(mParentLocation[0], mParentLocation[1]);

		final Rect boundsInScreen = mTempBoundsInScreen;

		// Obtain and initialize an AccessibilityNodeInfo with
		// information about the virtual view.
		info = AccessibilityNodeInfoCompat.obtain();
		info.addAction(AccessibilityNodeInfoCompat.ACTION_SELECT);
		info.addAction(AccessibilityNodeInfoCompat.ACTION_CLEAR_SELECTION);
		info.setPackageName(mKeyboardView.getContext().getPackageName());
		info.setClassName(key.getClass().getName());
		info.setBoundsInParent(boundsInParent);
		info.setBoundsInScreen(boundsInScreen);
		info.setParent(mKeyboardView);
		info.setSource(mKeyboardView, virtualViewId);
		info.setBoundsInScreen(boundsInScreen);
		info.setText(keyDescription);
		}

		return info;
		}

		/**
		* Performs an accessibility action on a virtual view, i.e. a descendant of
		* the host View, with the given <code>virtualViewId</code> or the host View itself if
		* <code>virtualViewId</code> equals to {@link View#NO_ID}.
		*
		* @param action The action to perform.
		* @param virtualViewId A client defined virtual view id.
		* @return True if the action was performed.
		* @see #createAccessibilityNodeInfo(int)
		* @see AccessibilityNodeInfoCompat
		*/
		@Override
		public boolean performAccessibilityAction(int action, int virtualViewId) {
		if (virtualViewId == View.NO_ID) {
		// Perform the action on the host View.
		switch (action) {
		case AccessibilityNodeInfoCompat.ACTION_SELECT:
		if (!mKeyboardView.isSelected()) {
		mKeyboardView.setSelected(true);
		return mKeyboardView.isSelected();
		}
		break;
		case AccessibilityNodeInfoCompat.ACTION_CLEAR_SELECTION:
		if (mKeyboardView.isSelected()) {
		mKeyboardView.setSelected(false);
		return !mKeyboardView.isSelected();
		}
		break;
		}
		} else {
		// Find the view that corresponds to the given id.
		final Key child = mVirtualViewIdToKey.get(virtualViewId);
		if (child == null)
		return false;

		// Perform the action on a virtual view.
		switch (action) {
		case AccessibilityNodeInfoCompat.ACTION_SELECT:
		// TODO: Provide some focus indicator.
		return true;
		case AccessibilityNodeInfoCompat.ACTION_CLEAR_SELECTION:
		// TODO: Provide some clear focus indicator.
		return true;
		}
		}

		return false;
		}

		/**
		* Finds {@link AccessibilityNodeInfoCompat}s by text. The match is case
		* insensitive containment. The search is relative to the virtual view, i.e.
		* a descendant of the host View, with the given <code>virtualViewId</code> or the host
		* View itself <code>virtualViewId</code> equals to {@link View#NO_ID}.
		*
		* @param virtualViewId A client defined virtual view id which defined the
		* root of the tree in which to perform the search.
		* @param text The searched text.
		* @return A list of node info.
		* @see #createAccessibilityNodeInfo(int)
		* @see AccessibilityNodeInfoCompat
		*/
		@Override
		public List<AccessibilityNodeInfoCompat> findAccessibilityNodeInfosByText(
		String text, int virtualViewId) {
		final String searchedLowerCase = text.toLowerCase();
		final Keyboard keyboard = mKeyboardView.getKeyboard();

		List<AccessibilityNodeInfoCompat> results = null;

		if (virtualViewId == View.NO_ID) {
		for (Key key : keyboard.mKeys) {
		results = findByTextAndPopulate(searchedLowerCase, key, results);
		}
		} else {
		final Key key = mVirtualViewIdToKey.get(virtualViewId);

		results = findByTextAndPopulate(searchedLowerCase, key, results);
		}

		if (results == null) {
		return Collections.emptyList();
		}

		return results;
		}

		/**
		* Helper method for {@link #findAccessibilityNodeInfosByText(String, int)}.
		* Takes a current set of results and matches a specified key against a
		* lower-case search string. Returns an updated list of results.
		*
		* @param searchedLowerCase The lower-case search string.
		* @param key The key to compare against.
		* @param results The current list of results, or {@code null} if no results
		* found.
		* @return An updated list of results, or {@code null} if no results found.
		*/
		private List<AccessibilityNodeInfoCompat> findByTextAndPopulate(String searchedLowerCase,
		Key key, List<AccessibilityNodeInfoCompat> results) {
		if (!keyContainsText(key, searchedLowerCase)) {
		return results;
		}

		final int childVirtualViewId = generateVirtualViewIdForKey(key);
		final AccessibilityNodeInfoCompat nodeInfo = createAccessibilityNodeInfo(
		childVirtualViewId);

		if (results == null) {
		results = new LinkedList<AccessibilityNodeInfoCompat>();
		}

		results.add(nodeInfo);

		return results;
		}

		/**
		* Returns whether a key's current description contains the lower-case
		* search text.
		*
		* @param key The key to compare against.
		* @param textLowerCase The lower-case search string.
		* @return {@code true} if the key contains the search text.
		*/
		private boolean keyContainsText(Key key, String textLowerCase) {
		if (key == null) {
		return false;
		}

		final String description = getKeyDescription(key);

		if (description == null) {
		return false;
		}

		return description.toLowerCase().contains(textLowerCase);
		}

		/**
		* Returns the context-specific description for a {@link Key}.
		*
		* @param key The key to describe.
		* @return The context-specific description of the key.
		*/
		private String getKeyDescription(Key key) {
		final EditorInfo editorInfo = mInputMethodService.getCurrentInputEditorInfo();
		final boolean shouldObscure = mAccessibilityUtils.shouldObscureInput(editorInfo);
		final String keyDescription = mKeyCodeDescriptionMapper.getDescriptionForKey(
		mKeyboardView.getContext(), mKeyboardView.getKeyboard(), key, shouldObscure);

		return keyDescription;
		}

		/**
		* Assigns virtual view IDs to keyboard keys and populates the related maps.
		*/
		private void assignVirtualViewIds() {
		final Keyboard keyboard = mKeyboardView.getKeyboard();
		if (keyboard == null) {
		return;
		}

		mVirtualViewIdToKey.clear();

		final Set<Key> keySet = keyboard.mKeys;
		for (Key key : keySet) {
		final int virtualViewId = generateVirtualViewIdForKey(key);
		mVirtualViewIdToKey.put(virtualViewId, key);
		}
		}

		/**
		* Updates the parent's on-screen location.
		*/
		private void updateParentLocation() {
		mKeyboardView.getLocationOnScreen(mParentLocation);
		}

		/**
		* Generates a virtual view identifier for the specified key.
		*
		* @param key The key to identify.
		* @return A virtual view identifier.
		*/
		private static int generateVirtualViewIdForKey(Key key) {
		// The key code is unique within an instance of a Keyboard.
		return key.mCode;
		}

		private final OnGlobalLayoutListener mGlobalLayoutListener = new OnGlobalLayoutListener() {
		@Override
		public void onGlobalLayout() {
		assignVirtualViewIds();
		updateParentLocation();
		}
		};
		}

java/src/com/android/inputmethod/accessibility/AccessibilityUtils.java

+5 −6

Original line number	Diff line number	Diff line
		@@ -21,13 +21,14 @@ import android.inputmethodservice.InputMethodService;
		import android.media.AudioManager;
		import android.os.SystemClock;
		import android.provider.Settings;
		import android.support.v4.view.MotionEventCompat;
		import android.util.Log;
		import android.view.MotionEvent;
		import android.view.accessibility.AccessibilityEvent;
		import android.view.accessibility.AccessibilityManager;
		import android.view.inputmethod.EditorInfo;

		import com.android.inputmethod.compat.AccessibilityManagerCompatWrapper;
		import com.android.inputmethod.compat.AccessibilityManagerCompatUtils;
		import com.android.inputmethod.compat.AudioManagerCompatWrapper;
		import com.android.inputmethod.compat.InputTypeCompatUtils;
		import com.android.inputmethod.compat.MotionEventCompatUtils;
		@@ -44,7 +45,6 @@ public class AccessibilityUtils {

		private Context mContext;
		private AccessibilityManager mAccessibilityManager;
		private AccessibilityManagerCompatWrapper mCompatManager;
		private AudioManagerCompatWrapper mAudioManager;

		/*
		@@ -77,7 +77,6 @@ public class AccessibilityUtils {
		mContext = context;
		mAccessibilityManager = (AccessibilityManager) context
		.getSystemService(Context.ACCESSIBILITY_SERVICE);
		mCompatManager = new AccessibilityManagerCompatWrapper(mAccessibilityManager);

		final AudioManager audioManager = (AudioManager) context
		.getSystemService(Context.AUDIO_SERVICE);
		@@ -94,7 +93,7 @@ public class AccessibilityUtils {
		public boolean isTouchExplorationEnabled() {
		return ENABLE_ACCESSIBILITY
		&& mAccessibilityManager.isEnabled()
		&& mCompatManager.isTouchExplorationEnabled();
		&& AccessibilityManagerCompatUtils.isTouchExplorationEnabled(mAccessibilityManager);
		}

		/**
		@@ -110,7 +109,7 @@ public class AccessibilityUtils {

		return action == MotionEventCompatUtils.ACTION_HOVER_ENTER
		\|\| action == MotionEventCompatUtils.ACTION_HOVER_EXIT
		\|\| action == MotionEventCompatUtils.ACTION_HOVER_MOVE;
		\|\| action == MotionEventCompat.ACTION_HOVER_MOVE;
		}

		/**

java/src/com/android/inputmethod/accessibility/AccessibleKeyboardViewProxy.java

+108 −56

File changed.

Preview size limit exceeded, changes collapsed.

java/src/com/android/inputmethod/accessibility/FlickGestureDetector.java

+3 −2

Original line number	Diff line number	Diff line
		@@ -18,6 +18,7 @@ package com.android.inputmethod.accessibility;

		import android.content.Context;
		import android.os.Message;
		import android.support.v4.view.MotionEventCompat;
		import android.view.MotionEvent;
		import android.view.ViewConfiguration;

		@@ -32,7 +33,7 @@ import com.android.inputmethod.latin.StaticInnerHandlerWrapper;
		* properties:
		* <ul>
		* <li>Begins with a {@link MotionEventCompatUtils#ACTION_HOVER_ENTER} event
		* <li>Contains any number of {@link MotionEventCompatUtils#ACTION_HOVER_MOVE}
		* <li>Contains any number of {@link MotionEventCompat#ACTION_HOVER_MOVE}
		* events
		* <li>Ends with a {@link MotionEventCompatUtils#ACTION_HOVER_EXIT} event
		* <li>Maximum duration of 250 milliseconds
		@@ -128,7 +129,7 @@ public abstract class FlickGestureDetector {
		final float distanceSquare = calculateDistanceSquare(mCachedHoverEnter, event);

		switch (event.getAction()) {
		case MotionEventCompatUtils.ACTION_HOVER_MOVE:
		case MotionEventCompat.ACTION_HOVER_MOVE:
		// Consume all valid move events before timeout.
		return true;
		case MotionEventCompatUtils.ACTION_HOVER_EXIT: