/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. 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 distributed under the
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* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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package com.android.settings.display;
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import android.app.ActivityManager;
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import android.content.ContentResolver;
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import android.content.Context;
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import android.database.ContentObserver;
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import android.hardware.display.ColorDisplayManager;
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import android.net.Uri;
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import android.os.Handler;
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import android.os.Looper;
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import android.os.UserHandle;
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import android.provider.Settings.Secure;
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import android.provider.Settings.System;
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import androidx.annotation.VisibleForTesting;
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import androidx.preference.Preference;
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import androidx.preference.PreferenceScreen;
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import com.android.settingslib.core.lifecycle.LifecycleObserver;
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import com.android.settingslib.core.lifecycle.events.OnStart;
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import com.android.settingslib.core.lifecycle.events.OnStop;
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import com.android.settings.core.TogglePreferenceController;
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public class DisplayWhiteBalancePreferenceController extends TogglePreferenceController
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implements LifecycleObserver, OnStart, OnStop {
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private ColorDisplayManager mColorDisplayManager;
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@VisibleForTesting
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ContentObserver mContentObserver;
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private Preference mPreference;
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public DisplayWhiteBalancePreferenceController(Context context, String key) {
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super(context, key);
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}
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@Override
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public int getAvailabilityStatus() {
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return getColorDisplayManager().isDisplayWhiteBalanceAvailable(mContext) ?
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AVAILABLE : DISABLED_FOR_USER;
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}
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@Override
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public boolean isChecked() {
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return getColorDisplayManager().isDisplayWhiteBalanceEnabled();
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}
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@Override
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public boolean setChecked(boolean isChecked) {
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return getColorDisplayManager().setDisplayWhiteBalanceEnabled(isChecked);
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}
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@Override
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public void onStart() {
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if (!isAvailable()) {
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return;
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}
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final ContentResolver cr = mContext.getContentResolver();
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mContentObserver = new ContentObserver(new Handler(Looper.getMainLooper())) {
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@Override
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public void onChange(boolean selfChange, Uri uri) {
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super.onChange(selfChange, uri);
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updateVisibility();
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}
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};
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cr.registerContentObserver(
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Secure.getUriFor(Secure.ACCESSIBILITY_DISPLAY_INVERSION_ENABLED),
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false /* notifyForDescendants */, mContentObserver,
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ActivityManager.getCurrentUser());
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cr.registerContentObserver(
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Secure.getUriFor(Secure.ACCESSIBILITY_DISPLAY_DALTONIZER_ENABLED),
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false /* notifyForDescendants */, mContentObserver,
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ActivityManager.getCurrentUser());
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cr.registerContentObserver(
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System.getUriFor(System.DISPLAY_COLOR_MODE),
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false /* notifyForDescendants */, mContentObserver,
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ActivityManager.getCurrentUser());
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updateVisibility();
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}
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@Override
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public void onStop() {
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if (mContentObserver != null) {
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mContext.getContentResolver().unregisterContentObserver(mContentObserver);
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mContentObserver = null;
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}
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}
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@Override
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public void displayPreference(PreferenceScreen screen) {
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super.displayPreference(screen);
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mPreference = screen.findPreference(getPreferenceKey());
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}
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@VisibleForTesting
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ColorDisplayManager getColorDisplayManager() {
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if (mColorDisplayManager == null) {
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mColorDisplayManager = mContext.getSystemService(ColorDisplayManager.class);
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}
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return mColorDisplayManager;
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}
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@VisibleForTesting
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void updateVisibility() {
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if (mPreference != null) {
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ColorDisplayManager cdm = getColorDisplayManager();
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// Display white balance is only valid in linear light space. COLOR_MODE_SATURATED
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// implies unmanaged color mode, and hence unknown color processing conditions.
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// We also disallow display white balance when color accessibility features are enabled.
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mPreference.setVisible(cdm.getColorMode() != ColorDisplayManager.COLOR_MODE_SATURATED &&
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!cdm.areAccessibilityTransformsEnabled(mContext));
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}
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}
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}
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