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ConversationListViewModel.java
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ConversationListViewModel.java
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package org.thoughtcrime.securesms.conversationlist;
import android.app.Application;
import android.database.ContentObserver;
import android.os.Handler;
import android.text.TextUtils;
import androidx.annotation.NonNull;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;
import androidx.lifecycle.ViewModelProvider;
import androidx.paging.DataSource;
import androidx.paging.LivePagedListBuilder;
import androidx.paging.PagedList;
import org.thoughtcrime.securesms.conversationlist.model.Conversation;
import org.thoughtcrime.securesms.conversationlist.model.SearchResult;
import org.thoughtcrime.securesms.database.DatabaseContentProviders;
import org.thoughtcrime.securesms.database.DatabaseFactory;
import org.thoughtcrime.securesms.dependencies.ApplicationDependencies;
import org.thoughtcrime.securesms.megaphone.Megaphone;
import org.thoughtcrime.securesms.megaphone.MegaphoneRepository;
import org.thoughtcrime.securesms.megaphone.Megaphones;
import org.thoughtcrime.securesms.search.SearchRepository;
import org.thoughtcrime.securesms.util.Debouncer;
import org.thoughtcrime.securesms.util.Util;
import org.thoughtcrime.securesms.util.concurrent.SignalExecutors;
import org.thoughtcrime.securesms.util.paging.Invalidator;
class ConversationListViewModel extends ViewModel {
private final Application application;
private final MutableLiveData<Megaphone> megaphone;
private final MutableLiveData<SearchResult> searchResult;
private final LiveData<PagedList<Conversation>> conversationList;
private final MutableLiveData<Integer> archivedCount;
private final SearchRepository searchRepository;
private final MegaphoneRepository megaphoneRepository;
private final Debouncer debouncer;
private final ContentObserver observer;
private final Invalidator invalidator;
private String lastQuery;
private ConversationListViewModel(@NonNull Application application, @NonNull SearchRepository searchRepository, boolean isArchived) {
this.application = application;
this.megaphone = new MutableLiveData<>();
this.searchResult = new MutableLiveData<>();
this.archivedCount = new MutableLiveData<>();
this.searchRepository = searchRepository;
this.megaphoneRepository = ApplicationDependencies.getMegaphoneRepository();
this.debouncer = new Debouncer(300);
this.invalidator = new Invalidator();
this.observer = new ContentObserver(new Handler()) {
@Override
public void onChange(boolean selfChange) {
if (!TextUtils.isEmpty(getLastQuery())) {
searchRepository.query(getLastQuery(), searchResult::postValue);
}
if (!isArchived) {
updateArchivedCount();
}
}
};
DataSource.Factory<Integer, Conversation> factory = new ConversationListDataSource.Factory(application, invalidator, isArchived);
PagedList.Config config = new PagedList.Config.Builder()
.setPageSize(15)
.setInitialLoadSizeHint(30)
.setEnablePlaceholders(true)
.build();
this.conversationList = new LivePagedListBuilder<>(factory, config).setFetchExecutor(ConversationListDataSource.EXECUTOR)
.setInitialLoadKey(0)
.build();
if (!isArchived) {
updateArchivedCount();
}
application.getContentResolver().registerContentObserver(DatabaseContentProviders.ConversationList.CONTENT_URI, true, observer);
}
@NonNull LiveData<SearchResult> getSearchResult() {
return searchResult;
}
@NonNull LiveData<Megaphone> getMegaphone() {
return megaphone;
}
@NonNull LiveData<PagedList<Conversation>> getConversationList() {
return conversationList;
}
@NonNull LiveData<Integer> getArchivedCount() {
return archivedCount;
}
void onVisible() {
megaphoneRepository.getNextMegaphone(megaphone::postValue);
}
void onMegaphoneCompleted(@NonNull Megaphones.Event event) {
megaphone.postValue(null);
megaphoneRepository.markFinished(event);
}
void onMegaphoneSnoozed(@NonNull Megaphones.Event event) {
megaphoneRepository.markSeen(event);
megaphone.postValue(null);
}
void onMegaphoneVisible(@NonNull Megaphone visible) {
megaphoneRepository.markVisible(visible.getEvent());
}
void updateQuery(String query) {
lastQuery = query;
debouncer.publish(() -> searchRepository.query(query, result -> {
Util.runOnMain(() -> {
if (query.equals(lastQuery)) {
searchResult.setValue(result);
}
});
}));
}
private @NonNull String getLastQuery() {
return lastQuery == null ? "" : lastQuery;
}
@Override
protected void onCleared() {
invalidator.invalidate();
debouncer.clear();
application.getContentResolver().unregisterContentObserver(observer);
}
private void updateArchivedCount() {
SignalExecutors.BOUNDED.execute(() -> {
archivedCount.postValue(DatabaseFactory.getThreadDatabase(application).getArchivedConversationListCount());
});
}
public static class Factory extends ViewModelProvider.NewInstanceFactory {
private final boolean isArchived;
public Factory(boolean isArchived) {
this.isArchived = isArchived;
}
@Override
public @NonNull<T extends ViewModel> T create(@NonNull Class<T> modelClass) {
//noinspection ConstantConditions
return modelClass.cast(new ConversationListViewModel(ApplicationDependencies.getApplication(), new SearchRepository(), isArchived));
}
}
}