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/*
* 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.graphics.Color;
import android.graphics.Paint;
import android.inputmethodservice.InputMethodService;
import android.util.Log;
import android.view.MotionEvent;
import android.view.accessibility.AccessibilityEvent;
import android.view.inputmethod.EditorInfo;
import com.android.inputmethod.compat.AccessibilityEventCompatUtils;
import com.android.inputmethod.compat.MotionEventCompatUtils;
import com.android.inputmethod.keyboard.Key;
import com.android.inputmethod.keyboard.LatinKeyboardView;
import com.android.inputmethod.keyboard.PointerTracker;
public class AccessibleKeyboardViewProxy {
private static final String TAG = AccessibleKeyboardViewProxy.class.getSimpleName();
private static final AccessibleKeyboardViewProxy sInstance = new AccessibleKeyboardViewProxy();
private InputMethodService mInputMethod;
private FlickGestureDetector mGestureDetector;
private LatinKeyboardView mView;
private AccessibleKeyboardActionListener mListener;
private Key mLastHoverKey = null;
public static void init(InputMethodService inputMethod) {
sInstance.initInternal(inputMethod);
sInstance.mListener = AccessibleInputMethodServiceProxy.getInstance();
}
public static AccessibleKeyboardViewProxy getInstance() {
return sInstance;
}
public static void setView(LatinKeyboardView view) {
sInstance.mView = view;
}
private AccessibleKeyboardViewProxy() {
// Not publicly instantiable.
}
private void initInternal(InputMethodService inputMethod) {
final Paint paint = new Paint();
paint.setTextAlign(Paint.Align.LEFT);
paint.setTextSize(14.0f);
paint.setAntiAlias(true);
paint.setColor(Color.YELLOW);
mInputMethod = inputMethod;
mGestureDetector = new KeyboardFlickGestureDetector(inputMethod);
}
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
if (mView == null) {
Log.e(TAG, "No keyboard view set!");
return false;
}
switch (event.getEventType()) {
case AccessibilityEventCompatUtils.TYPE_VIEW_HOVER_ENTER:
final Key key = mLastHoverKey;
if (key == null)
break;
final EditorInfo info = mInputMethod.getCurrentInputEditorInfo();
final boolean shouldObscure = AccessibilityUtils.getInstance().shouldObscureInput(info);
final CharSequence description = KeyCodeDescriptionMapper.getInstance()
.getDescriptionForKey(mView.getContext(), mView.getKeyboard(), key,
shouldObscure);
if (description == null)
return false;
event.getText().add(description);
break;
}
return true;
}
/**
* Receives hover events when accessibility is turned on in SDK versions ICS
* and higher.
*
* @param event The hover event.
* @return {@code true} if the event is handled
*/
public boolean dispatchHoverEvent(MotionEvent event, PointerTracker tracker) {
if (mGestureDetector.onHoverEvent(event, this, tracker))
return true;
return onHoverEventInternal(event, tracker);
}
/**
* Handles touch exploration events when Accessibility is turned on.
*
* @param event The touch exploration hover event.
* @return {@code true} if the event was handled
*/
/*package*/ boolean onHoverEventInternal(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 Key key = tracker.getKeyOn(x, y);
if (key != mLastHoverKey) {
fireKeyHoverEvent(mLastHoverKey, false);
mLastHoverKey = key;
fireKeyHoverEvent(mLastHoverKey, true);
}
return true;
}
return false;
}
private void fireKeyHoverEvent(Key key, 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 (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 class KeyboardFlickGestureDetector extends FlickGestureDetector {
public KeyboardFlickGestureDetector(Context context) {
super(context);
}
@Override
public boolean onFlick(MotionEvent e1, MotionEvent e2, int direction) {
if (mListener != null) {
mListener.onFlickGesture(direction);
}
return true;
}
}
}
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