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package it.niedermann.nextcloud.deck.ui.helper.dnd;
import android.app.Activity;
import android.graphics.Point;
import android.view.DragEvent;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.cardview.widget.CardView;
import androidx.recyclerview.widget.RecyclerView;
import androidx.viewpager.widget.ViewPager;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import butterknife.BindInt;
import butterknife.ButterKnife;
import it.niedermann.nextcloud.deck.DeckLog;
import it.niedermann.nextcloud.deck.R;
import it.niedermann.nextcloud.deck.model.full.FullCard;
import it.niedermann.nextcloud.deck.ui.card.CardAdapter;
import it.niedermann.nextcloud.deck.ui.stack.StackAdapter;
public class CrossTabDragAndDrop {
private static final ScrollHelper SCROLL_HELPER = new ScrollHelper();
public interface CardMovedByDragListener {
void onCardMoved(FullCard movedCard, long stackId, int position);
}
private final Activity activity;
private final float pxToReact;
private long lastSwap = 0;
private long lastMove = 0;
@BindInt(R.integer.drag_n_drop_dp_to_react)
int dragAndDropDPtoReact;
@BindInt(R.integer.drag_n_drop_dp_to_react_top_bottom)
int dragAndDropDPtoReactTopBottom;
@BindInt(R.integer.drag_n_drop_ms_to_react)
int msToReact;
@BindInt(R.integer.drag_n_drop_dp_to_react_top_bottom)
int msToReactOnMove;
private final float pxToReactTopBottom;
private final Set<CardMovedByDragListener> moveListenerList = new HashSet<>(1);
public CrossTabDragAndDrop(Activity activity) {
this.activity = activity;
ButterKnife.bind(this, activity);
final float density = activity.getResources().getDisplayMetrics().density;
this.pxToReact = dragAndDropDPtoReact * density;
this.pxToReactTopBottom = dragAndDropDPtoReactTopBottom * density;
}
public void register(final ViewPager viewPager) {
viewPager.setOnDragListener((View v, DragEvent dragEvent) -> {
DraggedCardLocalState draggedCardLocalState = (DraggedCardLocalState) dragEvent.getLocalState();
CardView cardView = draggedCardLocalState.getDraggedView();
switch (dragEvent.getAction()) {
case DragEvent.ACTION_DRAG_STARTED: {
cardView.setVisibility(View.INVISIBLE);
draggedCardLocalState.onDragStart(viewPager);
break;
}
case DragEvent.ACTION_DRAG_LOCATION: {
RecyclerView currentRecyclerView = draggedCardLocalState.getRecyclerView();
CardAdapter cardAdapter = draggedCardLocalState.getCardAdapter();
Point size = new Point();
activity.getWindowManager().getDefaultDisplay().getSize(size);
long now = System.currentTimeMillis();
if (lastSwap + msToReact < now) { // don't change Tabs so fast!
int oldTabPosition = viewPager.getCurrentItem();
boolean shouldSwitchTab = true;
int newTabPosition = -1;
// change tab? if yes, which direction?
if (dragEvent.getX() <= pxToReact) {
newTabPosition = oldTabPosition - 1;
} else if (dragEvent.getX() >= size.x - pxToReact) {
newTabPosition = oldTabPosition + 1;
} else {
shouldSwitchTab = false;
}
if (shouldSwitchTab && isMovePossible(viewPager, newTabPosition)) {
removeItem(currentRecyclerView, cardView, cardAdapter);
detectAndKillDuplicatesInNeighbourTab(viewPager, draggedCardLocalState.getDraggedCard(), oldTabPosition, newTabPosition);
switchTab(viewPager, draggedCardLocalState, now, newTabPosition);
return true;
}
}
//scroll if needed
if (dragEvent.getY() <= pxToReactTopBottom) {
SCROLL_HELPER.startScroll(currentRecyclerView, ScrollHelper.ScrollDirection.UP);
} else if (dragEvent.getY() >= currentRecyclerView.getBottom() - pxToReactTopBottom) {
SCROLL_HELPER.startScroll(currentRecyclerView, ScrollHelper.ScrollDirection.DOWN);
} else {
SCROLL_HELPER.stopScroll();
}
if (lastMove + msToReactOnMove < now){
//push around the other cards
View viewUnder = currentRecyclerView.findChildViewUnder(dragEvent.getX(), dragEvent.getY());
if (viewUnder != null) {
int toPositon = currentRecyclerView.getChildAdapterPosition(viewUnder);
if (toPositon != -1) {
// DeckLog.log("dnd childUnder: "+((TextView)((LinearLayout)((LinearLayout)((CardView) viewUnder).getChildAt(0)).getChildAt(0)).getChildAt(0)).getText());
int fromPosition = currentRecyclerView.getChildAdapterPosition(cardView);
if (fromPosition != -1 && fromPosition != toPositon) {
cardAdapter.moveItem(fromPosition, toPositon);
draggedCardLocalState.setPositionInCardAdapter(toPositon);
lastMove = now;
}
}
}
}
break;
}
case DragEvent.ACTION_DROP: {
SCROLL_HELPER.stopScroll();
cardView.setVisibility(View.VISIBLE);
notifyListeners(draggedCardLocalState);
break;
}
}
return true;
});
}
private void switchTab(ViewPager viewPager, final DraggedCardLocalState draggedCardLocalState, long now, int newPosition) {
draggedCardLocalState.onTabChanged(viewPager, newPosition);
viewPager.setCurrentItem(newPosition);
final RecyclerView recyclerView = draggedCardLocalState.getRecyclerView();
CardAdapter cardAdapter = draggedCardLocalState.getCardAdapter();
//insert card in new tab
View firstVisibleView = recyclerView.getChildAt(0);
int positionToInsert = firstVisibleView == null ? 0 : recyclerView.getChildAdapterPosition(firstVisibleView) + 1;
cardAdapter.addItem(draggedCardLocalState.getDraggedCard(), positionToInsert);
RecyclerView.OnChildAttachStateChangeListener onChildAttachStateChangeListener = new RecyclerView.OnChildAttachStateChangeListener() {
@Override
public void onChildViewAttachedToWindow(@NonNull View view) {
recyclerView.removeOnChildAttachStateChangeListener(this);
draggedCardLocalState.setInsertedListener(null);
CardView cardView = (CardView) view;
cardView.setVisibility(View.INVISIBLE);
draggedCardLocalState.setDraggedView(cardView);
}
@Override
public void onChildViewDetachedFromWindow(@NonNull View view) {/* do nothing */}
};
draggedCardLocalState.setInsertedListener(onChildAttachStateChangeListener);
recyclerView.addOnChildAttachStateChangeListener(onChildAttachStateChangeListener);
cardAdapter.notifyItemInserted(positionToInsert);
cardAdapter.notifyItemChanged(positionToInsert);
lastSwap = now;
}
private static boolean isMovePossible(ViewPager viewPager, int newPosition) {
return newPosition < viewPager.getAdapter().getCount() && newPosition >= 0;
}
private void detectAndKillDuplicatesInNeighbourTab(ViewPager viewPager, FullCard cardToFind, int oldTabPosition, int newTabPosition) {
int tabPositionToCheck = newTabPosition > oldTabPosition ? newTabPosition+1 : newTabPosition-1;
if (isMovePossible(viewPager, tabPositionToCheck)) {
viewPager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener(){
@Override
public void onPageSelected(int position) {
super.onPageSelected(position);
viewPager.removeOnPageChangeListener(this);
StackAdapter stackAdapter = (StackAdapter) viewPager.getAdapter();
DeckLog.log("### tabPositionToCheck: " + tabPositionToCheck);
DeckLog.log("### item: " + stackAdapter.getItem(tabPositionToCheck).getAdapter());
CardAdapter cardAdapter = stackAdapter.getItem(tabPositionToCheck).getAdapter();
cardAdapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
@Override
public void onChanged() {
super.onChanged();
cardAdapter.unregisterAdapterDataObserver(this);
List<FullCard> cardList = cardAdapter.getCardList();
for (int i = 0; i < cardList.size(); i++) {
FullCard c = cardList.get(i);
if (cardToFind.getCard().getLocalId().equals(c.getLocalId())){
cardAdapter.removeItem(i);
cardAdapter.notifyItemRemoved(i);
// DeckLog.log("dnd removed dupe at tab "+tabPositionToCheck+": "+c.getCard().getTitle());
break;
}
}
}
});
}
});
}
}
private static void removeItem(RecyclerView currentRecyclerView, CardView cardView, CardAdapter cardAdapter) {
int oldCardPosition = currentRecyclerView.getChildAdapterPosition(cardView);
if (oldCardPosition != -1) {
cardAdapter.removeItem(oldCardPosition);
}
}
private void notifyListeners(DraggedCardLocalState draggedCardLocalState) {
for (CardMovedByDragListener listener : moveListenerList) {
listener.onCardMoved(draggedCardLocalState.getDraggedCard(), draggedCardLocalState.getCurrentStackId(), draggedCardLocalState.getPositionInCardAdapter());
}
}
public void addCardMovedByDragListener(CardMovedByDragListener listener){
moveListenerList.add(listener);
}
public void removeCardMovedByDragListener(CardMovedByDragListener listener){
moveListenerList.remove(listener);
}
}
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