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Observe messages for previous/next navigation

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M66B
2019-01-12 10:45:57 +00:00
parent 2f6b18cd61
commit 0e49cdfe8f
3 changed files with 228 additions and 206 deletions
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57
app/src/main/java/eu/faircode/email/ViewModelMessages.java
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@@ -19,35 +19,76 @@ package eu.faircode.email;
Copyright 2018-2019 by Marcel Bokhorst (M66B)
*/
import java.util.HashMap;
import java.util.Map;
import androidx.lifecycle.Lifecycle;
import androidx.lifecycle.LifecycleObserver;
import androidx.lifecycle.LifecycleOwner;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.Observer;
import androidx.lifecycle.OnLifecycleEvent;
import androidx.lifecycle.ViewModel;
import androidx.paging.PagedList;
public class ViewModelMessages extends ViewModel {
private PagedList<TupleMessageEx> messages = null;
private Map<Boolean, LiveData<PagedList<TupleMessageEx>>> messages = new HashMap<>();
void setMessages(PagedList<TupleMessageEx> messages) {
this.messages = messages;
void setMessages(AdapterMessage.ViewType viewType, LiveData<PagedList<TupleMessageEx>> messages) {
boolean thread = (viewType == AdapterMessage.ViewType.THREAD);
this.messages.put(thread, messages);
}
void observe(AdapterMessage.ViewType viewType, LifecycleOwner owner, Observer<PagedList<TupleMessageEx>> observer) {
if (owner.getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED)) {
final boolean thread = (viewType == AdapterMessage.ViewType.THREAD);
messages.get(thread).observe(owner, observer);
owner.getLifecycle().addObserver(new LifecycleObserver() {
@OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
public void onDestroyed() {
Log.i("Removed model thread=" + thread);
messages.remove(thread);
}
});
}
}
void removeObservers(AdapterMessage.ViewType viewType, LifecycleOwner owner) {
if (owner.getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED)) {
boolean thread = (viewType == AdapterMessage.ViewType.THREAD);
LiveData<PagedList<TupleMessageEx>> list = messages.get(thread);
if (list != null)
list.removeObservers(owner);
}
}
boolean isEmpty(AdapterMessage.ViewType viewType) {
boolean thread = (viewType == AdapterMessage.ViewType.THREAD);
LiveData<PagedList<TupleMessageEx>> list = messages.get(thread);
return (list == null || list.getValue() == null || list.getValue().size() == 0);
}
@Override
protected void onCleared() {
messages = null;
messages.clear();
}
Target[] getPrevNext(String thread) {
if (messages == null)
LiveData<PagedList<TupleMessageEx>> list = messages.get(false);
if (list == null || list.getValue() == null || list.getValue().size() == 0)
return new Target[]{null, null};
boolean found = false;
TupleMessageEx prev = null;
TupleMessageEx next = null;
for (int i = 0; i < messages.size(); i++) {
TupleMessageEx item = messages.get(i);
for (int i = 0; i < list.getValue().size(); i++) {
TupleMessageEx item = list.getValue().get(i);
if (item == null)
continue;
if (found) {
prev = item;
messages.loadAround(i);
list.getValue().loadAround(i);
break;
}
if (thread.equals(item.thread))