74 lines
2.3 KiB
Java
74 lines
2.3 KiB
Java
/*
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* Copyright (c) 2019 Hemanth Savarala.
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*
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* Licensed under the GNU General Public License v3
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*
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* This is free software: you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by
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* the Free Software Foundation either version 3 of the License, or (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*/
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package code.name.monkey.retromusic.util;
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import android.graphics.Canvas;
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import androidx.annotation.NonNull;
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import androidx.recyclerview.widget.ItemTouchHelper;
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import androidx.recyclerview.widget.RecyclerView;
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public class SwipeAndDragHelper extends ItemTouchHelper.Callback {
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private final ActionCompletionContract contract;
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public SwipeAndDragHelper(@NonNull ActionCompletionContract contract) {
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this.contract = contract;
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}
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@Override
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public int getMovementFlags(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {
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int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
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return makeMovementFlags(dragFlags, 0);
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}
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@Override
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public boolean onMove(
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@NonNull RecyclerView recyclerView,
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RecyclerView.ViewHolder viewHolder,
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RecyclerView.ViewHolder target) {
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contract.onViewMoved(viewHolder.getLayoutPosition(), target.getLayoutPosition());
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return true;
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}
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@Override
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public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {}
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@Override
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public boolean isLongPressDragEnabled() {
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return false;
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}
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@Override
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public void onChildDraw(
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@NonNull Canvas c,
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@NonNull RecyclerView recyclerView,
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@NonNull RecyclerView.ViewHolder viewHolder,
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float dX,
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float dY,
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int actionState,
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boolean isCurrentlyActive) {
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if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
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float alpha = 1 - (Math.abs(dX) / recyclerView.getWidth());
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viewHolder.itemView.setAlpha(alpha);
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}
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super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
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}
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public interface ActionCompletionContract {
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void onViewMoved(int oldPosition, int newPosition);
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}
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}
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