android/sdk/src/main/java/org/apache/weex/ui/view/listview/adapter/ListBaseViewHolder.java

/*
 * 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 org.apache.weex.ui.view.listview.adapter;

import android.support.v7.widget.RecyclerView;
import android.view.View;

import org.apache.weex.ui.component.WXComponent;
import org.apache.weex.ui.component.WXHeader;

import java.lang.ref.WeakReference;


/**
 * There are bi-directional association between ViewHolder and View.
 * This is accomplished by weak-reference and final field from ViewHolder to View.
 * From View to ViewHolder, this is done by set {@link android.view.ViewGroup.LayoutParams} to View.
 */
public class ListBaseViewHolder extends RecyclerView.ViewHolder {
  private int mViewType;
  private boolean isRecycled;
  private WeakReference<WXComponent> mComponent;

  public ListBaseViewHolder(WXComponent component, int viewType) {
    super(component.getHostView());
    mViewType = viewType;
    mComponent = new WeakReference(component);
    // This tag is used to determine whether bind / rebind data is needed.
    // It should be false When component can not be recycled Which means
    // no need to bind / rebind data.
    isRecycled = component.canRecycled();
  }

  public ListBaseViewHolder(WXComponent component, int viewType, boolean forceBindData) {
    this(component, viewType);
    isRecycled = isRecycled || forceBindData;
  }

  public ListBaseViewHolder(View view, int viewType) {
    super(view);
    mViewType = viewType;
  }

  public boolean isRecycled() {
    return isRecycled;
  }

  public void recycled() {
    if (mComponent != null && mComponent.get() != null) {
      mComponent.get().recycled();
      isRecycled = true;

    }
  }

  public void bindData(WXComponent component) {
    if (mComponent != null && mComponent.get() != null) {
      mComponent.get().bindData(component);
      isRecycled = false;
    }
  }
    
  public boolean isFullSpan() {
    return mComponent != null && mComponent.get() instanceof WXHeader;
  }

  public boolean canRecycled() {
    if (mComponent != null && mComponent.get() != null) {
      return mComponent.get().canRecycled();
    }
    return true;
  }

  public View getView() {
    return itemView;
  }

  public int getViewType() {
    return mViewType;
  }

  public void setComponentUsing(boolean using) {
    if (mComponent != null && mComponent.get() != null)
      mComponent.get().setUsing(using);
  }

  public WXComponent getComponent() {
    return mComponent != null ? mComponent.get() : null;
  }
}