| /** |
| * 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.template; |
| |
| import android.support.v4.util.ArrayMap; |
| import android.support.v7.widget.LinearLayoutManager; |
| import android.support.v7.widget.RecyclerView; |
| import android.support.v7.widget.StaggeredGridLayoutManager; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.FrameLayout; |
| |
| import com.taobao.weex.common.Constants; |
| import com.taobao.weex.ui.view.refresh.wrapper.BounceRecyclerView; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * StickyHelper For Template List |
| * Created by furture on 2017/8/24. |
| */ |
| public class TemplateStickyHelper { |
| private WXRecyclerTemplateList recyclerTemplateList; |
| private List<Integer> stickyPositions; |
| private ArrayMap<Integer, TemplateViewHolder> stickyHolderCache; |
| private List<String> mStickyTypes; |
| |
| |
| public TemplateStickyHelper(WXRecyclerTemplateList recyclerTemplateList) { |
| this.recyclerTemplateList = recyclerTemplateList; |
| this.stickyPositions = new ArrayList<>(); |
| this.stickyHolderCache = new ArrayMap(); |
| this.mStickyTypes = new ArrayList<>(8); |
| } |
| |
| /** |
| * dispatch scroll event, sticky header |
| * */ |
| public void onBeforeScroll(int dx, int dy) { |
| if(stickyPositions == null || stickyPositions.size() == 0){ |
| return; |
| } |
| BounceRecyclerView bounceRecyclerView = recyclerTemplateList.getHostView(); |
| RecyclerView recyclerView = recyclerTemplateList.getHostView().getInnerView(); |
| RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager(); |
| int firstVisiblePosition = -1; |
| int lastVisiblePosition = -1; |
| if (layoutManager instanceof LinearLayoutManager) { |
| firstVisiblePosition = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition(); |
| lastVisiblePosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition(); |
| }else if (layoutManager instanceof StaggeredGridLayoutManager) { |
| int [] firstVisibleItemPositions = new int[3];//max 3 column |
| firstVisiblePosition = ((StaggeredGridLayoutManager) layoutManager).findFirstVisibleItemPositions(firstVisibleItemPositions)[0]; |
| lastVisiblePosition = ((StaggeredGridLayoutManager) layoutManager).findLastVisibleItemPositions(firstVisibleItemPositions)[0]; |
| } |
| if(firstVisiblePosition < 0){ |
| return; |
| } |
| |
| TemplateViewHolder firstVisibleItemHolder = (TemplateViewHolder) recyclerView.findViewHolderForAdapterPosition(firstVisiblePosition); |
| if(firstVisibleItemHolder == null){ |
| return; |
| } |
| |
| //find match sticky position |
| int matchStickyPosition = -1; |
| for (Integer headerPosition : stickyPositions){ |
| if(headerPosition == null){ |
| continue; |
| } |
| if(headerPosition <= firstVisiblePosition){ |
| matchStickyPosition = Math.max(matchStickyPosition, headerPosition); |
| }else{ |
| break; |
| } |
| } |
| if(matchStickyPosition < 0){ |
| //remove holder for match position not found |
| View stickyFakeView = bounceRecyclerView.getChildAt(bounceRecyclerView.getChildCount() - 1); |
| if(stickyFakeView.getTag() instanceof TemplateViewHolder){ |
| TemplateViewHolder stickyFakeViewHolder = (TemplateViewHolder) stickyFakeView.getTag(); |
| bounceRecyclerView.removeView(stickyFakeViewHolder.itemView); |
| stickyFakeViewHolder.itemView.setTranslationY(0); |
| if(stickyFakeViewHolder.getComponent() != null |
| && stickyFakeViewHolder.getComponent().getDomObject() != null |
| && stickyFakeViewHolder.getComponent().getDomObject().getEvents().contains(Constants.Event.UNSTICKY)){ |
| stickyFakeViewHolder.getComponent().fireEvent(Constants.Event.UNSTICKY); |
| } |
| } |
| |
| /**check has sticky cell not visible */ |
| for(int i=0; i<recyclerView.getChildCount(); i++) { |
| View itemView = recyclerView.getChildAt(i); |
| TemplateViewHolder itemHolder = (TemplateViewHolder) recyclerView.getChildViewHolder(itemView); |
| if (itemHolder == null) { |
| continue; |
| } |
| int adapterPosition = itemHolder.getAdapterPosition(); |
| if (!stickyPositions.contains(adapterPosition)) { |
| continue; |
| } |
| if(itemView.getVisibility() != View.VISIBLE) { |
| itemView.setVisibility(View.VISIBLE); |
| } |
| } |
| return; |
| } |
| |
| //onCreate holder for match position if not exist |
| View stickyFakeView = bounceRecyclerView.getChildAt(bounceRecyclerView.getChildCount() - 1); |
| if(!(stickyFakeView.getTag() instanceof TemplateViewHolder) |
| || ((TemplateViewHolder) stickyFakeView.getTag()).getHolderPosition() != matchStickyPosition){ |
| |
| //remove previous sticky header |
| if(stickyFakeView.getTag() instanceof TemplateViewHolder && |
| ((TemplateViewHolder) stickyFakeView.getTag()).getHolderPosition() != matchStickyPosition){ |
| TemplateViewHolder stickyFakeViewHolder = (TemplateViewHolder) stickyFakeView.getTag(); |
| bounceRecyclerView.removeView(stickyFakeViewHolder.itemView); |
| stickyFakeViewHolder.itemView.setTranslationY(0); |
| if(stickyFakeViewHolder.getComponent() != null |
| && stickyFakeViewHolder.getComponent().getDomObject() != null |
| && stickyFakeViewHolder.getComponent().getDomObject().getEvents().contains(Constants.Event.UNSTICKY)){ |
| stickyFakeViewHolder.getComponent().fireEvent(Constants.Event.UNSTICKY); |
| } |
| } |
| |
| //onCreate new sticky |
| int stickyHolderType = recyclerTemplateList.getItemViewType(matchStickyPosition); |
| TemplateViewHolder fakeStickyHolder = stickyHolderCache.get(stickyHolderType); |
| if(fakeStickyHolder == null){ |
| fakeStickyHolder = recyclerTemplateList.onCreateViewHolder(recyclerView, stickyHolderType); |
| stickyHolderCache.put(stickyHolderType, fakeStickyHolder); |
| } |
| recyclerTemplateList.onBindViewHolder(fakeStickyHolder, matchStickyPosition); |
| fakeStickyHolder.itemView.setTranslationY(0); |
| fakeStickyHolder.itemView.setTag(fakeStickyHolder); |
| FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); |
| fakeStickyHolder.getComponent().clearPreLayout(); |
| if(fakeStickyHolder.itemView.getParent() != null){ |
| ViewGroup parent = (ViewGroup) fakeStickyHolder.itemView.getParent(); |
| parent.removeView(fakeStickyHolder.itemView); |
| } |
| bounceRecyclerView.addView(fakeStickyHolder.itemView, params); |
| fakeStickyHolder.getComponent().setLayout(fakeStickyHolder.getComponent().getDomObject()); |
| stickyFakeView = fakeStickyHolder.itemView; |
| if(fakeStickyHolder.getComponent() != null |
| && fakeStickyHolder.getComponent().getDomObject() != null |
| && fakeStickyHolder.getComponent().getDomObject().getEvents().contains(Constants.Event.STICKY)){ |
| fakeStickyHolder.getComponent().fireEvent(Constants.Event.STICKY); |
| } |
| } |
| TemplateViewHolder stickyFakeViewHolder = (TemplateViewHolder) stickyFakeView.getTag(); |
| for(int i=0; i<recyclerView.getChildCount(); i++){ |
| View itemView = recyclerView.getChildAt(i); |
| TemplateViewHolder itemHolder = (TemplateViewHolder) recyclerView.getChildViewHolder(itemView); |
| if(itemHolder == null){ |
| continue; |
| } |
| int adapterPosition = itemHolder.getAdapterPosition(); |
| if(!stickyPositions.contains(adapterPosition)){ |
| continue; |
| } |
| if(adapterPosition == stickyFakeViewHolder.getHolderPosition()){ |
| if(itemView.getVisibility() != View.INVISIBLE) { |
| itemView.setVisibility(View.INVISIBLE); |
| } |
| }else{ |
| if(itemView.getVisibility() != View.VISIBLE) { |
| itemView.setVisibility(View.VISIBLE); |
| } |
| } |
| } |
| |
| if(firstVisibleItemHolder.getComponent().isSticky()){ |
| if(firstVisibleItemHolder.itemView.getY() < 0){ |
| if(firstVisibleItemHolder.itemView.getVisibility() != View.INVISIBLE) { |
| firstVisibleItemHolder.itemView.setVisibility(View.INVISIBLE); |
| } |
| if(stickyFakeView.getVisibility() != View.VISIBLE) { |
| stickyFakeView.setVisibility(View.VISIBLE); |
| } |
| stickyFakeView.bringToFront(); |
| }else{ |
| if(firstVisibleItemHolder.itemView.getVisibility() != View.VISIBLE) { |
| firstVisibleItemHolder.itemView.setVisibility(View.VISIBLE); |
| } |
| if(stickyFakeView.getVisibility() != View.GONE) { |
| stickyFakeView.setVisibility(View.GONE); |
| } |
| } |
| }else{ |
| if(stickyFakeView.getVisibility() != View.VISIBLE){ |
| stickyFakeView.setVisibility(View.VISIBLE); |
| } |
| } |
| |
| //handle sticky is related, find next sticky position on screen |
| int nextVisiblePostion = firstVisiblePosition + 1; |
| if(lastVisiblePosition > 0){ |
| for(int i=nextVisiblePostion; i<= lastVisiblePosition; i++){ |
| if(stickyPositions.contains(i)){ |
| nextVisiblePostion = i; |
| break; |
| } |
| } |
| } |
| if(!stickyPositions.contains(nextVisiblePostion)){ |
| if(stickyFakeViewHolder.itemView.getTranslationY() < 0){ |
| stickyFakeViewHolder.itemView.setTranslationY(0); |
| } |
| return; |
| } |
| TemplateViewHolder nextStickyHolder = (TemplateViewHolder) recyclerView.findViewHolderForAdapterPosition(nextVisiblePostion); |
| if(nextStickyHolder == null |
| || nextStickyHolder.getComponent() == null){ |
| return; |
| } |
| int translationY = (int)(nextStickyHolder.itemView.getY() - stickyFakeViewHolder.itemView.getMeasuredHeight()); |
| if(translationY <= 0){ |
| stickyFakeViewHolder.itemView.setTranslationY(translationY); |
| }else{ |
| stickyFakeViewHolder.itemView.setTranslationY(0); |
| } |
| } |
| |
| public List<Integer> getStickyPositions() { |
| if(stickyPositions == null){ |
| stickyPositions = new ArrayList<>(); |
| } |
| return stickyPositions; |
| } |
| |
| public List<String> getStickyTypes() { |
| return mStickyTypes; |
| } |
| } |
