/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.camera.app;
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import android.app.Activity;
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import android.content.ContentResolver;
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import android.content.Context;
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import android.content.pm.ActivityInfo;
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import android.content.res.Configuration;
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import android.graphics.Point;
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import android.os.Handler;
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import android.provider.Settings;
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import android.view.Display;
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import android.view.OrientationEventListener;
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import android.view.Surface;
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import android.view.WindowManager;
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import com.android.camera.debug.Log;
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import com.android.camera.util.AndroidServices;
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import com.android.camera.util.ApiHelper;
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import com.android.camera.util.CameraUtil;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* The implementation of {@link com.android.camera.app.OrientationManager}
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* by {@link android.view.OrientationEventListener}.
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*/
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public class OrientationManagerImpl implements OrientationManager {
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private static final Log.Tag TAG = new Log.Tag("OrientMgrImpl");
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// DeviceOrientation hysteresis amount used in rounding, in degrees
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private static final int ORIENTATION_HYSTERESIS = 5;
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private final Activity mActivity;
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// The handler used to invoke listener callback.
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private final Handler mHandler;
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private final MyOrientationEventListener mOrientationListener;
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// We keep the last known orientation. So if the user first orient
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// the camera then point the camera to floor or sky, we still have
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// the correct orientation.
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private DeviceOrientation mLastDeviceOrientation = DeviceOrientation.CLOCKWISE_0;
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// If the framework orientation is locked.
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private boolean mOrientationLocked = false;
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// This is true if "Settings -> Display -> Rotation Lock" is checked. We
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// don't allow the orientation to be unlocked if the value is true.
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private boolean mRotationLockedSetting = false;
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private final List<OnOrientationChangeListener> mListeners =
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new ArrayList<OnOrientationChangeListener>();
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private final boolean mIsDefaultToPortrait;
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/**
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* Instantiates a new orientation manager.
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*
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* @param activity The main activity object.
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* @param handler The handler used to invoke listener callback.
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*/
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public OrientationManagerImpl(Activity activity, Handler handler) {
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mActivity = activity;
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mOrientationListener = new MyOrientationEventListener(activity);
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mHandler = handler;
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mIsDefaultToPortrait = isDefaultToPortrait(activity);
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}
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public void resume() {
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ContentResolver resolver = mActivity.getContentResolver();
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mRotationLockedSetting = Settings.System.getInt(
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resolver, Settings.System.ACCELEROMETER_ROTATION, 0) != 1;
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mOrientationListener.enable();
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}
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public void pause() {
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mOrientationListener.disable();
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}
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@Override
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public DeviceNaturalOrientation getDeviceNaturalOrientation() {
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return mIsDefaultToPortrait ? DeviceNaturalOrientation.PORTRAIT :
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DeviceNaturalOrientation.LANDSCAPE;
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}
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@Override
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public DeviceOrientation getDeviceOrientation() {
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return mLastDeviceOrientation;
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}
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@Override
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public DeviceOrientation getDisplayRotation() {
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return DeviceOrientation.from((360 - CameraUtil.getDisplayRotation()) % 360);
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}
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@Override
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public void addOnOrientationChangeListener(OnOrientationChangeListener listener) {
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if (mListeners.contains(listener)) {
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return;
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}
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mListeners.add(listener);
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}
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@Override
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public void removeOnOrientationChangeListener(OnOrientationChangeListener listener) {
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if (!mListeners.remove(listener)) {
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Log.v(TAG, "Removing non-existing listener.");
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}
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}
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@Override
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public boolean isInLandscape() {
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int roundedOrientationDegrees = mLastDeviceOrientation.getDegrees();
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if (mIsDefaultToPortrait) {
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if (roundedOrientationDegrees % 180 == 90) {
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return true;
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}
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} else {
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if (roundedOrientationDegrees % 180 == 0) {
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return true;
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}
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}
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return false;
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}
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@Override
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public boolean isInPortrait() {
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return !isInLandscape();
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}
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@Override
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public void lockOrientation() {
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if (mOrientationLocked || mRotationLockedSetting) {
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return;
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}
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mOrientationLocked = true;
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if (ApiHelper.HAS_ORIENTATION_LOCK) {
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mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);
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} else {
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mActivity.setRequestedOrientation(calculateCurrentScreenOrientation());
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}
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}
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@Override
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public void unlockOrientation() {
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if (!mOrientationLocked || mRotationLockedSetting) {
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return;
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}
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mOrientationLocked = false;
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Log.d(TAG, "unlock orientation");
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mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);
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}
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@Override
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public boolean isOrientationLocked() {
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return (mOrientationLocked || mRotationLockedSetting);
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}
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private int calculateCurrentScreenOrientation() {
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int displayRotation = getDisplayRotation(mActivity);
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// Display rotation >= 180 means we need to use the REVERSE landscape/portrait
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boolean standard = displayRotation < 180;
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if (mActivity.getResources().getConfiguration().orientation
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== Configuration.ORIENTATION_LANDSCAPE) {
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return standard
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? ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
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: ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
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} else {
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if (displayRotation == 90 || displayRotation == 270) {
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// If displayRotation = 90 or 270 then we are on a landscape
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// device. On landscape devices, portrait is a 90 degree
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// clockwise rotation from landscape, so we need
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// to flip which portrait we pick as display rotation is counter clockwise
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standard = !standard;
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}
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return standard
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? ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
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: ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
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}
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}
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// This listens to the device orientation, so we can update the compensation.
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private class MyOrientationEventListener extends OrientationEventListener {
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public MyOrientationEventListener(Context context) {
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super(context);
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}
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@Override
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public void onOrientationChanged(int orientation) {
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if (orientation == ORIENTATION_UNKNOWN) {
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return;
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}
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final DeviceOrientation roundedDeviceOrientation =
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roundOrientation(mLastDeviceOrientation, orientation);
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if (roundedDeviceOrientation == mLastDeviceOrientation) {
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return;
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}
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Log.v(TAG, "orientation changed (from:to) " + mLastDeviceOrientation +
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":" + roundedDeviceOrientation);
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mLastDeviceOrientation = roundedDeviceOrientation;
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for (final OnOrientationChangeListener listener : mListeners) {
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mHandler.post(new Runnable() {
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@Override
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public void run() {
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listener.onOrientationChanged(OrientationManagerImpl.this, roundedDeviceOrientation);
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}
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});
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}
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}
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}
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private static DeviceOrientation roundOrientation(DeviceOrientation oldDeviceOrientation,
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int newRawOrientation) {
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int dist = Math.abs(newRawOrientation - oldDeviceOrientation.getDegrees());
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dist = Math.min(dist, 360 - dist);
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boolean isOrientationChanged = (dist >= 45 + ORIENTATION_HYSTERESIS);
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if (isOrientationChanged) {
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int newRoundedOrientation = ((newRawOrientation + 45) / 90 * 90) % 360;
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switch (newRoundedOrientation) {
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case 0:
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return DeviceOrientation.CLOCKWISE_0;
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case 90:
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return DeviceOrientation.CLOCKWISE_90;
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case 180:
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return DeviceOrientation.CLOCKWISE_180;
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case 270:
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return DeviceOrientation.CLOCKWISE_270;
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}
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}
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return oldDeviceOrientation;
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}
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private static int getDisplayRotation(Activity activity) {
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int rotation = activity.getWindowManager().getDefaultDisplay()
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.getRotation();
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switch (rotation) {
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case Surface.ROTATION_0: return 0;
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case Surface.ROTATION_90: return 90;
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case Surface.ROTATION_180: return 180;
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case Surface.ROTATION_270: return 270;
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}
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return 0;
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}
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/**
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* Calculate the default orientation of the device based on the width and
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* height of the display when rotation = 0 (i.e. natural width and height)
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*
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* @param context current context
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* @return whether the default orientation of the device is portrait
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*/
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private static boolean isDefaultToPortrait(Context context) {
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Display currentDisplay = AndroidServices.instance().provideWindowManager()
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.getDefaultDisplay();
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Point displaySize = new Point();
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currentDisplay.getSize(displaySize);
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int orientation = currentDisplay.getRotation();
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int naturalWidth, naturalHeight;
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if (orientation == Surface.ROTATION_0 || orientation == Surface.ROTATION_180) {
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naturalWidth = displaySize.x;
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naturalHeight = displaySize.y;
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} else {
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naturalWidth = displaySize.y;
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naturalHeight = displaySize.x;
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}
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return naturalWidth < naturalHeight;
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}
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}
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