| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package com.taobao.weex.ui.component.list; |
| |
| import android.support.annotation.NonNull; |
| import android.support.annotation.Nullable; |
| import android.support.v7.widget.RecyclerView; |
| import android.support.v7.widget.helper.ItemTouchHelper; |
| |
| import com.taobao.weex.WXEnvironment; |
| import com.taobao.weex.ui.component.WXComponent; |
| import com.taobao.weex.utils.WXLogUtils; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Description: |
| * Drag-drop support for list |
| * <p> |
| * Created by rowandjj(chuyi)<br/> |
| */ |
| |
| class DefaultDragHelper implements DragHelper { |
| |
| private boolean mLongPressEnabled; |
| |
| @NonNull |
| private final EventTrigger mEventTrigger; |
| @NonNull |
| private final RecyclerView mRecyclerView; |
| @NonNull |
| private final List<WXComponent> mDataSource; |
| @NonNull |
| private ItemTouchHelper mItemTouchHelper; |
| |
| private static final String EVENT_START_DRAG = "dragstart"; |
| private static final String EVENT_END_DRAG = "dragend"; |
| |
| private static final String TAG_EXCLUDED = "drag_excluded"; |
| |
| private static final String TAG = "WXListExComponent"; |
| |
| private boolean isDraggable = false; |
| |
| DefaultDragHelper(@NonNull List<WXComponent> dataSource, @NonNull RecyclerView recyclerView, @NonNull EventTrigger trigger) { |
| this.mDataSource = dataSource; |
| this.mEventTrigger = trigger; |
| this.mRecyclerView = recyclerView; |
| |
| //attach |
| this.mItemTouchHelper = new ItemTouchHelper(new DragSupportCallback(this, true)); |
| try { |
| mItemTouchHelper.attachToRecyclerView(mRecyclerView); |
| }catch (Throwable e) { |
| //ignore |
| } |
| } |
| |
| @Override |
| public void onDragStart(@NonNull WXComponent component, int from) { |
| if (WXEnvironment.isApkDebugable()) { |
| WXLogUtils.d(TAG, "list on drag start : from index " + from); |
| } |
| mEventTrigger.triggerEvent(EVENT_START_DRAG, buildEvent(component.getRef(), from, -1)); |
| } |
| |
| @Override |
| public void onDragEnd(@NonNull WXComponent component, int from, int to) { |
| if (WXEnvironment.isApkDebugable()) { |
| WXLogUtils.d(TAG, "list on drag end : " + "from index " + from + " to index " + to); |
| } |
| mEventTrigger.triggerEvent(EVENT_END_DRAG, buildEvent(component.getRef(), from, to)); |
| } |
| |
| @Override |
| public void onDragging(int fromPos, int toPos) { |
| if (WXEnvironment.isApkDebugable()) { |
| WXLogUtils.d(TAG, "list on dragging : from index " + fromPos + " to index " + toPos); |
| } |
| |
| RecyclerView.Adapter adapter = mRecyclerView.getAdapter(); |
| if (adapter == null) { |
| WXLogUtils.e(TAG, "drag failed because of RecyclerView#Adapter is not bound"); |
| return; |
| } |
| |
| if (fromPos >= 0 && fromPos <= mDataSource.size() - 1 && toPos >= 0 && toPos <= mDataSource.size() - 1) { |
| Collections.swap(mDataSource, fromPos, toPos); |
| adapter.notifyItemMoved(fromPos, toPos); |
| } |
| } |
| |
| @Override |
| public boolean isLongPressDragEnabled() { |
| return mLongPressEnabled; |
| } |
| |
| @Override |
| public void setLongPressDragEnabled(boolean enabled) { |
| this.mLongPressEnabled = enabled; |
| } |
| |
| @Override |
| public void startDrag(@NonNull RecyclerView.ViewHolder viewHolder) { |
| if (isDraggable) { |
| mItemTouchHelper.startDrag(viewHolder); |
| } |
| } |
| |
| @Override |
| public boolean isDraggable() { |
| return this.isDraggable; |
| } |
| |
| @Override |
| public void setDraggable(boolean draggable) { |
| this.isDraggable = draggable; |
| } |
| |
| @Override |
| public void setDragExcluded(@NonNull RecyclerView.ViewHolder viewHolder, boolean isExcluded) { |
| if (viewHolder.itemView == null) { |
| if (WXEnvironment.isApkDebugable()) { |
| WXLogUtils.e(TAG, "[error] viewHolder.itemView is null"); |
| } |
| return; |
| } |
| if (isExcluded) { |
| viewHolder.itemView.setTag(TAG_EXCLUDED); |
| } else { |
| viewHolder.itemView.setTag(null); |
| } |
| } |
| |
| @Override |
| public boolean isDragExcluded(@NonNull RecyclerView.ViewHolder viewHolder) { |
| if (viewHolder.itemView == null) { |
| if (WXEnvironment.isApkDebugable()) { |
| WXLogUtils.e(TAG, "[error] viewHolder.itemView is null"); |
| } |
| return false; |
| } |
| return viewHolder.itemView.getTag() != null && TAG_EXCLUDED.equals(viewHolder.itemView.getTag()); |
| } |
| |
| private Map<String, Object> buildEvent(@Nullable String target, int fromIndex, int toIndex) { |
| Map<String, Object> args = new HashMap<>(4); |
| args.put("target", target == null ? "unknown" : target); |
| args.put("fromIndex", fromIndex); |
| args.put("toIndex", toIndex); |
| args.put("timestamp", System.currentTimeMillis()); |
| return args; |
| } |
| } |