Compose: language selection
This commit is contained in:
Grishka
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package org.joinmastodon.android.ui.viewcontrollers;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.os.Build;
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import android.text.TextUtils;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.ViewTreeObserver;
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import android.view.textclassifier.TextClassificationManager;
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import android.view.textclassifier.TextLanguage;
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import android.widget.Checkable;
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import android.widget.CheckedTextView;
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import android.widget.RadioButton;
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import android.widget.TextView;
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import org.joinmastodon.android.R;
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import org.joinmastodon.android.api.MastodonAPIController;
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import org.joinmastodon.android.ui.DividerItemDecoration;
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import org.joinmastodon.android.ui.utils.UiUtils;
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import org.joinmastodon.android.ui.views.CheckableLinearLayout;
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import org.parceler.Parcel;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Comparator;
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import java.util.List;
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import java.util.Locale;
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import java.util.Objects;
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import java.util.function.Consumer;
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import java.util.stream.Collectors;
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import androidx.annotation.NonNull;
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import androidx.annotation.RequiresApi;
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import androidx.recyclerview.widget.LinearLayoutManager;
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import androidx.recyclerview.widget.RecyclerView;
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import me.grishka.appkit.utils.BindableViewHolder;
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import me.grishka.appkit.utils.MergeRecyclerAdapter;
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import me.grishka.appkit.utils.V;
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import me.grishka.appkit.views.UsableRecyclerView;
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public class ComposeLanguageAlertViewController{
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private Context context;
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private UsableRecyclerView list;
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private List<LocaleInfo> allLocales;
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private List<SpecialLocaleInfo> specialLocales=new ArrayList<>();
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private int selectedIndex=0;
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private Locale selectedLocale;
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public ComposeLanguageAlertViewController(Context context, String preferred, SelectedOption previouslySelected, String postText){
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this.context=context;
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allLocales=Arrays.stream(Locale.getAvailableLocales())
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.map(Locale::getLanguage)
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.distinct()
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.map(code->{
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Locale l=Locale.forLanguageTag(code);
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String name=l.getDisplayLanguage(Locale.getDefault());
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return new LocaleInfo(l, capitalizeLanguageName(name));
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})
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.sorted(Comparator.comparing(a->a.displayName))
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.collect(Collectors.toList());
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if(!TextUtils.isEmpty(preferred)){
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Locale l=Locale.forLanguageTag(preferred);
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SpecialLocaleInfo pref=new SpecialLocaleInfo();
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pref.locale=l;
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pref.displayName=capitalizeLanguageName(l.getDisplayLanguage(Locale.getDefault()));
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pref.title=context.getString(R.string.language_default);
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specialLocales.add(pref);
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}
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Locale def=Locale.forLanguageTag(Locale.getDefault().getLanguage());
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if(!def.getLanguage().equals(preferred)){
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SpecialLocaleInfo d=new SpecialLocaleInfo();
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d.locale=def;
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d.displayName=capitalizeLanguageName(def.getDisplayName());
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d.title=context.getString(R.string.language_system);
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specialLocales.add(d);
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}
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if(Build.VERSION.SDK_INT>=29 && !TextUtils.isEmpty(postText)){
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SpecialLocaleInfo detected=new SpecialLocaleInfo();
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detected.displayName=context.getString(R.string.language_detecting);
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detected.enabled=false;
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specialLocales.add(detected);
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detectLanguage(detected, postText);
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}
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if(previouslySelected!=null){
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if((previouslySelected.index<specialLocales.size() && Objects.equals(previouslySelected.locale, specialLocales.get(previouslySelected.index).locale)) ||
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(previouslySelected.index<specialLocales.size()+allLocales.size() && Objects.equals(previouslySelected.locale, allLocales.get(previouslySelected.index-specialLocales.size()).locale))){
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selectedIndex=previouslySelected.index;
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selectedLocale=previouslySelected.locale;
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}
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}else{
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selectedLocale=specialLocales.get(0).locale;
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}
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list=new UsableRecyclerView(context);
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MergeRecyclerAdapter adapter=new MergeRecyclerAdapter();
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adapter.addAdapter(new SpecialLanguagesAdapter());
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adapter.addAdapter(new AllLocalesAdapter());
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list.setAdapter(adapter);
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list.setLayoutManager(new LinearLayoutManager(context));
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list.addItemDecoration(new DividerItemDecoration(context, R.attr.colorM3OutlineVariant, 1, 16, 16, vh->vh.getAbsoluteAdapterPosition()==specialLocales.size()-1));
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list.addItemDecoration(new RecyclerView.ItemDecoration(){
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private Paint paint=new Paint();
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{
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paint.setColor(UiUtils.getThemeColor(context, R.attr.colorM3OutlineVariant));
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paint.setStyle(Paint.Style.STROKE);
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paint.setStrokeWidth(V.dp(1));
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}
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@Override
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public void onDrawOver(@NonNull Canvas c, @NonNull RecyclerView parent, @NonNull RecyclerView.State state){
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if(parent.canScrollVertically(1)){
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float y=parent.getHeight()-paint.getStrokeWidth()/2f;
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c.drawLine(0, y, parent.getWidth(), y, paint);
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}
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if(parent.canScrollVertically(-1)){
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float y=paint.getStrokeWidth()/2f;
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c.drawLine(0, y, parent.getWidth(), y, paint);
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}
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}
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});
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if(previouslySelected!=null && selectedIndex>0){
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list.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener(){
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@Override
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public boolean onPreDraw(){
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list.getViewTreeObserver().removeOnPreDrawListener(this);
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if(list.findViewHolderForAdapterPosition(selectedIndex)==null)
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list.scrollToPosition(selectedIndex);
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return true;
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}
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});
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}
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}
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@RequiresApi(api = Build.VERSION_CODES.Q)
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private void detectLanguage(SpecialLocaleInfo info, String text){
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MastodonAPIController.runInBackground(()->{
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TextLanguage lang=context.getSystemService(TextClassificationManager.class).getTextClassifier().detectLanguage(new TextLanguage.Request.Builder(text).build());
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list.post(()->{
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SpecialLanguageViewHolder holder=(SpecialLanguageViewHolder) list.findViewHolderForAdapterPosition(specialLocales.indexOf(info));
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if(lang.getLocaleHypothesisCount()==0 || lang.getConfidenceScore(lang.getLocale(0))<0.75f){
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info.displayName=context.getString(R.string.language_cant_detect);
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}else{
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Locale locale=lang.getLocale(0).toLocale();
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info.locale=locale;
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info.displayName=capitalizeLanguageName(locale.getDisplayName(Locale.getDefault()));
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info.title=context.getString(R.string.language_detected);
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info.enabled=true;
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if(holder!=null)
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UiUtils.beginLayoutTransition(holder.view);
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}
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if(holder!=null)
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holder.rebind();
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});
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});
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}
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public View getView(){
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return list;
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}
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// Needed because in some languages (e.g. Slavic ones) these names returned by the system start with a lowercase letter
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private String capitalizeLanguageName(String name){
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return name.substring(0, 1).toUpperCase(Locale.getDefault())+name.substring(1);
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}
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public SelectedOption getSelectedOption(){
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return new SelectedOption(selectedIndex, selectedLocale);
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}
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private void selectItem(int index){
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if(index==selectedIndex)
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return;
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if(selectedIndex!=-1){
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RecyclerView.ViewHolder holder=list.findViewHolderForAdapterPosition(selectedIndex);
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if(holder!=null && holder.itemView instanceof Checkable checkable)
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checkable.setChecked(false);
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}
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RecyclerView.ViewHolder holder=list.findViewHolderForAdapterPosition(index);
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if(holder!=null && holder.itemView instanceof Checkable checkable)
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checkable.setChecked(true);
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selectedIndex=index;
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}
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private class AllLocalesAdapter extends RecyclerView.Adapter<SimpleLanguageViewHolder>{
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@NonNull
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@Override
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public SimpleLanguageViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType){
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return new SimpleLanguageViewHolder();
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}
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@Override
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public void onBindViewHolder(@NonNull SimpleLanguageViewHolder holder, int position){
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holder.bind(allLocales.get(position));
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}
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@Override
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public int getItemCount(){
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return allLocales.size();
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}
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@Override
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public int getItemViewType(int position){
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return 1;
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}
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}
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private class SimpleLanguageViewHolder extends BindableViewHolder<LocaleInfo> implements UsableRecyclerView.Clickable{
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private final CheckedTextView text;
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public SimpleLanguageViewHolder(){
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super(context, R.layout.item_alert_single_choice_1line, list);
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text=(CheckedTextView) itemView;
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text.setCompoundDrawablesRelativeWithIntrinsicBounds(new RadioButton(context).getButtonDrawable(), null, null, null);
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}
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@Override
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public void onBind(LocaleInfo item){
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text.setText(item.displayName);
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text.setChecked(selectedIndex==getAbsoluteAdapterPosition());
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}
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@Override
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public void onClick(){
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selectItem(getAbsoluteAdapterPosition());
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selectedLocale=item.locale;
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}
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}
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private class SpecialLanguagesAdapter extends RecyclerView.Adapter<SpecialLanguageViewHolder>{
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@NonNull
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@Override
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public SpecialLanguageViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType){
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return new SpecialLanguageViewHolder();
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}
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@Override
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public void onBindViewHolder(@NonNull SpecialLanguageViewHolder holder, int position){
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holder.bind(specialLocales.get(position));
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}
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@Override
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public int getItemCount(){
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return specialLocales.size();
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}
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@Override
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public int getItemViewType(int position){
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return 2;
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}
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}
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private class SpecialLanguageViewHolder extends BindableViewHolder<SpecialLocaleInfo> implements UsableRecyclerView.DisableableClickable{
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private final TextView text, title;
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private final CheckableLinearLayout view;
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public SpecialLanguageViewHolder(){
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super(context, R.layout.item_alert_single_choice_2lines, list);
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text=findViewById(R.id.text);
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title=findViewById(R.id.title);
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view=((CheckableLinearLayout) itemView);
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findViewById(R.id.radiobutton).setBackground(new RadioButton(context).getButtonDrawable());
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}
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@Override
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public void onBind(SpecialLocaleInfo item){
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text.setText(item.displayName);
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if(!TextUtils.isEmpty(item.title)){
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title.setVisibility(View.VISIBLE);
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title.setText(item.title);
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}else{
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title.setVisibility(View.GONE);
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}
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text.setEnabled(item.enabled);
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view.setEnabled(item.enabled);
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view.setChecked(selectedIndex==getAbsoluteAdapterPosition());
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}
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@Override
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public void onClick(){
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selectItem(getAbsoluteAdapterPosition());
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selectedLocale=item.locale;
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}
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@Override
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public boolean isEnabled(){
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return item.enabled;
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}
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}
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private static class LocaleInfo{
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public final Locale locale;
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public final String displayName;
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private LocaleInfo(Locale locale, String displayName){
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this.locale=locale;
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this.displayName=displayName;
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}
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}
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private static class SpecialLocaleInfo{
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public Locale locale;
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public String displayName;
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public String title;
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public boolean enabled=true;
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}
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@Parcel
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public static class SelectedOption{
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public int index;
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public Locale locale;
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public SelectedOption(){}
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public SelectedOption(int index, Locale locale){
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this.index=index;
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this.locale=locale;
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}
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}
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}
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