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

/*
 * Copyright (C) 2017 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.content.Context;
import android.graphics.drawable.Drawable;
import androidx.annotation.VisibleForTesting;
import androidx.preference.PreferenceScreen;

import com.android.internal.app.ColorDisplayController;
import com.android.internal.logging.nano.MetricsProto;

import com.android.settings.applications.LayoutPreference;
import com.android.settings.R;
import com.android.settings.widget.RadioButtonPickerFragment;
import com.android.settingslib.widget.CandidateInfo;

import java.util.ArrayList;
import java.util.List;

@SuppressWarnings("WeakerAccess")
public class ColorModePreferenceFragment extends RadioButtonPickerFragment
        implements ColorDisplayController.Callback {

    @VisibleForTesting
    static final String KEY_COLOR_MODE_NATURAL = "color_mode_natural";
    @VisibleForTesting
    static final String KEY_COLOR_MODE_BOOSTED = "color_mode_boosted";
    @VisibleForTesting
    static final String KEY_COLOR_MODE_SATURATED = "color_mode_saturated";
    @VisibleForTesting
    static final String KEY_COLOR_MODE_AUTOMATIC = "color_mode_automatic";

    private ColorDisplayController mController;

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        mController = new ColorDisplayController(context);
        mController.setListener(this);
    }

    @Override
    public void onDetach() {
        super.onDetach();
        if (mController != null) {
            mController.setListener(null);
            mController = null;
        }
    }

    @Override
    protected int getPreferenceScreenResId() {
        return R.xml.color_mode_settings;
    }

    @VisibleForTesting
    void configureAndInstallPreview(LayoutPreference preview, PreferenceScreen screen) {
        preview.setSelectable(false);
        screen.addPreference(preview);
    }

    @Override
    protected void addStaticPreferences(PreferenceScreen screen) {
        final LayoutPreference preview = new LayoutPreference(screen.getContext(),
                R.layout.color_mode_preview);
        configureAndInstallPreview(preview, screen);
    }

    @Override
    protected List<? extends CandidateInfo> getCandidates() {
        final Context c = getContext();
        final int[] availableColorModes = c.getResources().getIntArray(
                com.android.internal.R.array.config_availableColorModes);

        List<ColorModeCandidateInfo> candidates = new ArrayList<ColorModeCandidateInfo>();
        if (availableColorModes != null) {
            for (int colorMode : availableColorModes) {
                if (colorMode == ColorDisplayController.COLOR_MODE_NATURAL) {
                    candidates.add(new ColorModeCandidateInfo(
                                c.getText(R.string.color_mode_option_natural),
                                KEY_COLOR_MODE_NATURAL, true /* enabled */));
                } else if (colorMode == ColorDisplayController.COLOR_MODE_BOOSTED) {
                    candidates.add(new ColorModeCandidateInfo(
                                c.getText(R.string.color_mode_option_boosted),
                                KEY_COLOR_MODE_BOOSTED, true /* enabled */));
                } else if (colorMode == ColorDisplayController.COLOR_MODE_SATURATED) {
                    candidates.add(new ColorModeCandidateInfo(
                                c.getText(R.string.color_mode_option_saturated),
                                KEY_COLOR_MODE_SATURATED, true /* enabled */));
                } else if (colorMode == ColorDisplayController.COLOR_MODE_AUTOMATIC) {
                    candidates.add(new ColorModeCandidateInfo(
                                c.getText(R.string.color_mode_option_automatic),
                                KEY_COLOR_MODE_AUTOMATIC, true /* enabled */));
                }
            }
        }
        return candidates;
    }

    @Override
    protected String getDefaultKey() {
        final int colorMode = mController.getColorMode();
        if (colorMode == ColorDisplayController.COLOR_MODE_AUTOMATIC) {
            return KEY_COLOR_MODE_AUTOMATIC;
        } else if (colorMode == ColorDisplayController.COLOR_MODE_SATURATED) {
            return KEY_COLOR_MODE_SATURATED;
        } else if (colorMode == ColorDisplayController.COLOR_MODE_BOOSTED) {
            return KEY_COLOR_MODE_BOOSTED;
        }
        return KEY_COLOR_MODE_NATURAL;
    }

    @Override
    protected boolean setDefaultKey(String key) {
        switch (key) {
            case KEY_COLOR_MODE_NATURAL:
                mController.setColorMode(ColorDisplayController.COLOR_MODE_NATURAL);
                break;
            case KEY_COLOR_MODE_BOOSTED:
                mController.setColorMode(ColorDisplayController.COLOR_MODE_BOOSTED);
                break;
            case KEY_COLOR_MODE_SATURATED:
                mController.setColorMode(ColorDisplayController.COLOR_MODE_SATURATED);
                break;
            case KEY_COLOR_MODE_AUTOMATIC:
                mController.setColorMode(ColorDisplayController.COLOR_MODE_AUTOMATIC);
                break;
        }
        return true;
    }

    @Override
    public int getMetricsCategory() {
        return MetricsProto.MetricsEvent.COLOR_MODE_SETTINGS;
    }

    @VisibleForTesting
    static class ColorModeCandidateInfo extends CandidateInfo {
        private final CharSequence mLabel;
        private final String mKey;

        ColorModeCandidateInfo(CharSequence label, String key, boolean enabled) {
            super(enabled);
            mLabel = label;
            mKey = key;
        }

        @Override
        public CharSequence loadLabel() {
            return mLabel;
        }

        @Override
        public Drawable loadIcon() {
            return null;
        }

        @Override
        public String getKey() {
            return mKey;
        }
    }

    @Override
    public void onAccessibilityTransformChanged(boolean state) {
        // Color modes are no not configurable when Accessibility transforms are enabled. Close
        // this fragment in that case.
        if (state) {
            getActivity().onBackPressed();
        }
    }
}