| /* |
| * 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.server.accessibility; |
| |
| import com.android.server.wm.InputFilter; |
| |
| import android.content.Context; |
| import android.util.Slog; |
| import android.view.InputDevice; |
| import android.view.InputEvent; |
| import android.view.MotionEvent; |
| import android.view.WindowManagerPolicy; |
| |
| /** |
| * Input filter for accessibility. |
| * |
| * Currently just a stub but will eventually implement touch exploration, etc. |
| */ |
| public class AccessibilityInputFilter extends InputFilter { |
| private static final String TAG = "AccessibilityInputFilter"; |
| private static final boolean DEBUG = false; |
| |
| private final Context mContext; |
| |
| /** |
| * This is an interface for explorers that take a {@link MotionEvent} |
| * stream and perform touch exploration of the screen content. |
| */ |
| public interface Explorer { |
| /** |
| * Handles a {@link MotionEvent}. |
| * |
| * @param event The event to handle. |
| * @param policyFlags The policy flags associated with the event. |
| */ |
| public void onMotionEvent(MotionEvent event, int policyFlags); |
| |
| /** |
| * Requests that the explorer clears its internal state. |
| * |
| * @param event The last received event. |
| * @param policyFlags The policy flags associated with the event. |
| */ |
| public void clear(MotionEvent event, int policyFlags); |
| |
| /** |
| * Requests that the explorer clears its internal state. |
| */ |
| public void clear(); |
| } |
| |
| private TouchExplorer mTouchExplorer; |
| private int mTouchscreenSourceDeviceId; |
| |
| public AccessibilityInputFilter(Context context) { |
| super(context.getMainLooper()); |
| mContext = context; |
| } |
| |
| @Override |
| public void onInstalled() { |
| if (DEBUG) { |
| Slog.d(TAG, "Accessibility input filter installed."); |
| } |
| mTouchExplorer = new TouchExplorer(this, mContext); |
| super.onInstalled(); |
| } |
| |
| @Override |
| public void onUninstalled() { |
| if (DEBUG) { |
| Slog.d(TAG, "Accessibility input filter uninstalled."); |
| } |
| mTouchExplorer.clear(); |
| super.onUninstalled(); |
| } |
| |
| @Override |
| public void onInputEvent(InputEvent event, int policyFlags) { |
| if (DEBUG) { |
| Slog.d(TAG, "Received event: " + event + ", policyFlags=0x" |
| + Integer.toHexString(policyFlags)); |
| } |
| if (event.getSource() == InputDevice.SOURCE_TOUCHSCREEN) { |
| MotionEvent motionEvent = (MotionEvent) event; |
| int deviceId = event.getDeviceId(); |
| if (mTouchscreenSourceDeviceId != deviceId) { |
| mTouchscreenSourceDeviceId = deviceId; |
| mTouchExplorer.clear(motionEvent, policyFlags); |
| } |
| if ((policyFlags & WindowManagerPolicy.FLAG_PASS_TO_USER) != 0) { |
| mTouchExplorer.onMotionEvent(motionEvent, policyFlags); |
| } else { |
| mTouchExplorer.clear(motionEvent, policyFlags); |
| } |
| } else { |
| super.onInputEvent(event, policyFlags); |
| } |
| } |
| } |