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/*
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* Copyright (C) 2015 Paul Burke
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.v2ray.ang.helper;
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import androidx.recyclerview.widget.RecyclerView;
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import androidx.recyclerview.widget.ItemTouchHelper;
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/**
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* Interface to listen for a move or dismissal event from a {@link ItemTouchHelper.Callback}.
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*
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* @author Paul Burke (ipaulpro)
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*/
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public interface ItemTouchHelperAdapter {
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/**
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* Called when an item has been dragged far enough to trigger a move. This is called every time
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* an item is shifted, and <strong>not</strong> at the end of a "drop" event.<br/>
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* <br/>
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* Implementations should call {@link RecyclerView.Adapter#notifyItemMoved(int, int)} after
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* adjusting the underlying data to reflect this move.
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*
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* @param fromPosition The start position of the moved item.
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* @param toPosition Then resolved position of the moved item.
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* @return True if the item was moved to the new adapter position.
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*
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* @see RecyclerView#getAdapterPositionFor(RecyclerView.ViewHolder)
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* @see RecyclerView.ViewHolder#getAdapterPosition()
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*/
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boolean onItemMove(int fromPosition, int toPosition);
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void onItemMoveCompleted();
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/**
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* Called when an item has been dismissed by a swipe.<br/>
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* <br/>
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* Implementations should call {@link RecyclerView.Adapter#notifyItemRemoved(int)} after
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* adjusting the underlying data to reflect this removal.
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*
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* @param position The position of the item dismissed.
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*
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* @see RecyclerView#getAdapterPositionFor(RecyclerView.ViewHolder)
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* @see RecyclerView.ViewHolder#getAdapterPosition()
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*/
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void onItemDismiss(int position);
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}
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/*
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* Copyright (C) 2015 Paul Burke
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.v2ray.ang.helper;
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import androidx.recyclerview.widget.ItemTouchHelper;
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/**
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* Interface to notify an item ViewHolder of relevant callbacks from {@link
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* ItemTouchHelper.Callback}.
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*
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* @author Paul Burke (ipaulpro)
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*/
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public interface ItemTouchHelperViewHolder {
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/**
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* Called when the {@link ItemTouchHelper} first registers an item as being moved or swiped.
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* Implementations should update the item view to indicate it's active state.
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*/
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void onItemSelected();
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/**
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* Called when the {@link ItemTouchHelper} has completed the move or swipe, and the active item
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* state should be cleared.
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*/
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void onItemClear();
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}
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/*
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* Copyright (C) 2015 Paul Burke
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.v2ray.ang.helper;
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import androidx.recyclerview.widget.RecyclerView;
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/**
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* Listener for manual initiation of a drag.
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*/
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public interface OnStartDragListener {
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/**
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* Called when a view is requesting a start of a drag.
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*
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* @param viewHolder The holder of the view to drag.
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*/
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void onStartDrag(RecyclerView.ViewHolder viewHolder);
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}
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/*
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* Copyright (C) 2015 Paul Burke
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.v2ray.ang.helper;
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import android.graphics.Canvas;
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import androidx.recyclerview.widget.GridLayoutManager;
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import androidx.recyclerview.widget.RecyclerView;
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import androidx.recyclerview.widget.ItemTouchHelper;
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import org.jetbrains.annotations.NotNull;
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/**
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* An implementation of {@link ItemTouchHelper.Callback} that enables basic drag & drop and
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* swipe-to-dismiss. Drag events are automatically started by an item long-press.<br/>
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* </br/>
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* Expects the <code>RecyclerView.Adapter</code> to listen for {@link
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* ItemTouchHelperAdapter} callbacks and the <code>RecyclerView.ViewHolder</code> to implement
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* {@link ItemTouchHelperViewHolder}.
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*
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* @author Paul Burke (ipaulpro)
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*/
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public class SimpleItemTouchHelperCallback extends ItemTouchHelper.Callback {
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public static final float ALPHA_FULL = 1.0f;
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private final ItemTouchHelperAdapter mAdapter;
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public SimpleItemTouchHelperCallback(ItemTouchHelperAdapter adapter) {
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mAdapter = adapter;
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}
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@Override
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public boolean isLongPressDragEnabled() {
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return true;
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}
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@Override
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public boolean isItemViewSwipeEnabled() {
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return false;
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}
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@Override
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public int getMovementFlags(RecyclerView recyclerView, @NotNull RecyclerView.ViewHolder viewHolder) {
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// Set movement flags based on the layout manager
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if (recyclerView.getLayoutManager() instanceof GridLayoutManager) {
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final int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
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final int swipeFlags = 0;
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return makeMovementFlags(dragFlags, swipeFlags);
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} else {
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final int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
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final int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
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return makeMovementFlags(dragFlags, swipeFlags);
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}
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}
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@Override
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public boolean onMove(@NotNull RecyclerView recyclerView, RecyclerView.ViewHolder source, RecyclerView.ViewHolder target) {
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if (source.getItemViewType() != target.getItemViewType()) {
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return false;
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}
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// Notify the adapter of the move
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mAdapter.onItemMove(source.getBindingAdapterPosition(), target.getBindingAdapterPosition());
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return true;
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}
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@Override
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public void onSwiped(RecyclerView.ViewHolder viewHolder, int i) {
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// Notify the adapter of the dismissal
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mAdapter.onItemDismiss(viewHolder.getBindingAdapterPosition());
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}
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@Override
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public void onChildDraw(@NotNull Canvas c, @NotNull RecyclerView recyclerView, @NotNull RecyclerView.ViewHolder viewHolder, float dX,
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float dY, int actionState, boolean isCurrentlyActive) {
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if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
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// Fade out the view as it is swiped out of the parent's bounds
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final float alpha = ALPHA_FULL - Math.abs(dX) / (float) viewHolder.itemView.getWidth();
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viewHolder.itemView.setAlpha(alpha);
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viewHolder.itemView.setTranslationX(dX);
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} else {
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super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
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}
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}
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@Override
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public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
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// We only want the active item to change
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if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
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if (viewHolder instanceof ItemTouchHelperViewHolder) {
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// Let the view holder know that this item is being moved or dragged
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ItemTouchHelperViewHolder itemViewHolder = (ItemTouchHelperViewHolder) viewHolder;
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itemViewHolder.onItemSelected();
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}
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}
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super.onSelectedChanged(viewHolder, actionState);
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}
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@Override
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public void clearView(@NotNull RecyclerView recyclerView, @NotNull RecyclerView.ViewHolder viewHolder) {
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super.clearView(recyclerView, viewHolder);
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mAdapter.onItemMoveCompleted();
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viewHolder.itemView.setAlpha(ALPHA_FULL);
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if (viewHolder instanceof ItemTouchHelperViewHolder) {
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// Tell the view holder it's time to restore the idle state
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ItemTouchHelperViewHolder itemViewHolder = (ItemTouchHelperViewHolder) viewHolder;
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itemViewHolder.onItemClear();
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}
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}
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}
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