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/*
* Copyright (C) 2018 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.settings.display;
import android.app.ActivityManager;
import android.content.ContentResolver;
import android.content.Context;
import android.database.ContentObserver;
import android.hardware.display.ColorDisplayManager;
import android.net.Uri;
import android.os.Handler;
import android.os.Looper;
import android.os.UserHandle;
import android.provider.Settings.Secure;
import android.provider.Settings.System;
import androidx.annotation.VisibleForTesting;
import androidx.preference.Preference;
import androidx.preference.PreferenceScreen;
import com.android.settingslib.core.lifecycle.LifecycleObserver;
import com.android.settingslib.core.lifecycle.events.OnStart;
import com.android.settingslib.core.lifecycle.events.OnStop;
import com.android.settings.core.TogglePreferenceController;
public class DisplayWhiteBalancePreferenceController extends TogglePreferenceController
implements LifecycleObserver, OnStart, OnStop {
private ColorDisplayManager mColorDisplayManager;
@VisibleForTesting
ContentObserver mContentObserver;
private Preference mPreference;
public DisplayWhiteBalancePreferenceController(Context context, String key) {
super(context, key);
}
@Override
public int getAvailabilityStatus() {
return getColorDisplayManager().isDisplayWhiteBalanceAvailable(mContext) ?
AVAILABLE : DISABLED_FOR_USER;
}
@Override
public boolean isChecked() {
return getColorDisplayManager().isDisplayWhiteBalanceEnabled();
}
@Override
public boolean setChecked(boolean isChecked) {
return getColorDisplayManager().setDisplayWhiteBalanceEnabled(isChecked);
}
@Override
public void onStart() {
if (!isAvailable()) {
return;
}
final ContentResolver cr = mContext.getContentResolver();
mContentObserver = new ContentObserver(new Handler(Looper.getMainLooper())) {
@Override
public void onChange(boolean selfChange, Uri uri) {
super.onChange(selfChange, uri);
updateVisibility();
}
};
cr.registerContentObserver(
Secure.getUriFor(Secure.ACCESSIBILITY_DISPLAY_INVERSION_ENABLED),
false /* notifyForDescendants */, mContentObserver,
ActivityManager.getCurrentUser());
cr.registerContentObserver(
Secure.getUriFor(Secure.ACCESSIBILITY_DISPLAY_DALTONIZER_ENABLED),
false /* notifyForDescendants */, mContentObserver,
ActivityManager.getCurrentUser());
cr.registerContentObserver(
System.getUriFor(System.DISPLAY_COLOR_MODE),
false /* notifyForDescendants */, mContentObserver,
ActivityManager.getCurrentUser());
updateVisibility();
}
@Override
public void onStop() {
if (mContentObserver != null) {
mContext.getContentResolver().unregisterContentObserver(mContentObserver);
mContentObserver = null;
}
}
@Override
public void displayPreference(PreferenceScreen screen) {
super.displayPreference(screen);
mPreference = screen.findPreference(getPreferenceKey());
}
@VisibleForTesting
ColorDisplayManager getColorDisplayManager() {
if (mColorDisplayManager == null) {
mColorDisplayManager = mContext.getSystemService(ColorDisplayManager.class);
}
return mColorDisplayManager;
}
@VisibleForTesting
void updateVisibility() {
if (mPreference != null) {
ColorDisplayManager cdm = getColorDisplayManager();
// Display white balance is only valid in linear light space. COLOR_MODE_SATURATED
// implies unmanaged color mode, and hence unknown color processing conditions.
// We also disallow display white balance when color accessibility features are enabled.
mPreference.setVisible(cdm.getColorMode() != ColorDisplayManager.COLOR_MODE_SATURATED &&
!cdm.areAccessibilityTransformsEnabled(mContext));
}
}
}
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