Magisk/app/src/main/java/com/topjohnwu/magisk/components/BasePreferenceFragment.java

package com.topjohnwu.magisk.components;

import android.annotation.SuppressLint;
import android.content.SharedPreferences;
import android.os.Build;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.preference.Preference;
import androidx.preference.PreferenceCategory;
import androidx.preference.PreferenceFragmentCompat;
import androidx.preference.PreferenceGroupAdapter;
import androidx.preference.PreferenceScreen;
import androidx.preference.PreferenceViewHolder;
import androidx.recyclerview.widget.RecyclerView;

import com.topjohnwu.magisk.App;
import com.topjohnwu.magisk.R;
import com.topjohnwu.magisk.utils.Topic;

public abstract class BasePreferenceFragment extends PreferenceFragmentCompat
        implements SharedPreferences.OnSharedPreferenceChangeListener, Topic.AutoSubscriber {

    public App app = App.self;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = super.onCreateView(inflater, container, savedInstanceState);
        app.prefs.registerOnSharedPreferenceChangeListener(this);
        Topic.subscribe(this);
        return v;
    }

    @Override
    public void onDestroyView() {
        app.prefs.unregisterOnSharedPreferenceChangeListener(this);
        Topic.unsubscribe(this);
        super.onDestroyView();
    }

    @Override
    public int[] getSubscribedTopics() {
        return BaseActivity.EMPTY_INT_ARRAY;
    }

    @Override
    protected RecyclerView.Adapter onCreateAdapter(PreferenceScreen preferenceScreen) {
        return new PreferenceGroupAdapter(preferenceScreen) {
            @SuppressLint("RestrictedApi")
            @Override
            public void onBindViewHolder(PreferenceViewHolder holder, int position) {
                super.onBindViewHolder(holder, position);
                Preference preference = getItem(position);
                if (preference instanceof PreferenceCategory)
                    setZeroPaddingToLayoutChildren(holder.itemView);
                else {
                    View iconFrame = holder.itemView.findViewById(R.id.icon_frame);
                    if (iconFrame != null) {
                        iconFrame.setVisibility(preference.getIcon() == null ? View.GONE : View.VISIBLE);
                    }
                }
            }
        };
    }

    private void setZeroPaddingToLayoutChildren(View view) {
        if (!(view instanceof ViewGroup))
            return;
        ViewGroup viewGroup = (ViewGroup) view;
        int childCount = viewGroup.getChildCount();
        for (int i = 0; i < childCount; i++) {
            setZeroPaddingToLayoutChildren(viewGroup.getChildAt(i));
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1)
                viewGroup.setPaddingRelative(0, viewGroup.getPaddingTop(), viewGroup.getPaddingEnd(), viewGroup.getPaddingBottom());
            else
                viewGroup.setPadding(0, viewGroup.getPaddingTop(), viewGroup.getPaddingRight(), viewGroup.getPaddingBottom());
        }
    }
}