src/com/android/settings/display/HdrBrightnessLevelPreferenceController.java

/*
 * Copyright (C) 2025 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 static android.provider.Settings.Secure.HDR_BRIGHTNESS_ENABLED;
import static android.provider.Settings.Secure.HDR_BRIGHTNESS_BOOST_LEVEL;

import android.content.Context;
import android.provider.Settings;

import androidx.annotation.NonNull;
import androidx.preference.Preference;
import androidx.preference.PreferenceScreen;

import com.android.settings.R;
import com.android.settings.core.SliderPreferenceController;
import com.android.settingslib.display.BrightnessUtils;
import com.android.settingslib.widget.SliderPreference;

import java.text.NumberFormat;
import java.util.Locale;

// LINT.IfChange
public class HdrBrightnessLevelPreferenceController extends SliderPreferenceController {

    private Locale mLocale;
    private NumberFormat mNumberFormat;
    private SliderPreference mPreference;

    public HdrBrightnessLevelPreferenceController(@NonNull Context context, @NonNull String key) {
        super(context, key);
    }

    @Override
    public int getAvailabilityStatus() {
        return HdrBrightnessUtils.getAvailabilityStatus(mContext);
    }

    @Override
    public int getSliceHighlightMenuRes() {
        return R.string.menu_key_display;
    }

    @Override
    public void displayPreference(PreferenceScreen screen) {
        super.displayPreference(screen);
        mPreference = screen.findPreference(getPreferenceKey());
        mPreference.setUpdatesContinuously(true);
        mPreference.setMax(getMax());
        mPreference.setMin(getMin());
        mPreference.setHapticFeedbackMode(SliderPreference.HAPTIC_FEEDBACK_MODE_ON_ENDS);
        mPreference.setSliderStateDescription(formatStateDescription(getSliderPosition()));
        mPreference.setSliderContentDescription(
                mContext.getString(R.string.hdr_brightness_slider_description));
    }

    @Override
    public final void updateState(Preference preference) {
        super.updateState(preference);
        boolean hdrBrightnessEnabled = Settings.Secure.getInt(mContext.getContentResolver(),
                HDR_BRIGHTNESS_ENABLED, /* def= */ 1) == 1;
        preference.setEnabled(hdrBrightnessEnabled);
    }

    @Override
    public int getSliderPosition() {
        return Math.round(Settings.Secure.getFloat(mContext.getContentResolver(),
                HDR_BRIGHTNESS_BOOST_LEVEL, /* def= */ 1) * getMax());
    }

    @Override
    public boolean setSliderPosition(int position) {
        mPreference.setSliderStateDescription(formatStateDescription(position));
        return Settings.Secure.putFloat(mContext.getContentResolver(), HDR_BRIGHTNESS_BOOST_LEVEL,
                ((float) position) / getMax());
    }

    @Override
    public int getMax() {
        return BrightnessUtils.GAMMA_SPACE_MAX;
    }

    @Override
    public int getMin() {
        return 0;
    }

    private CharSequence formatStateDescription(int progress) {
        Locale curLocale = mContext.getResources().getConfiguration().getLocales().get(0);
        if (mLocale == null || !mLocale.equals(curLocale)) {
            mLocale = curLocale;
            mNumberFormat = NumberFormat.getPercentInstance(mLocale);
        }
        return mNumberFormat.format(getPercent(progress));
    }

    private double getPercent(float progress) {
        final float maxProgress = getMax();
        final float minProgress = getMin();
        final float diffProgress = maxProgress - minProgress;
        if (diffProgress <= 0.0f) {
            return 0.0f;
        }
        final float percent = (progress - minProgress) / diffProgress;
        return Math.floor(Math.max(0.0f, Math.min(1.0f, percent)) * 100) / 100;
    }
}
// LINT.ThenChange(HdrBrightnessScreenApi.kt)