android/sdk/src/main/java/com/taobao/weex/dom/action/RemoveElementAction.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 com.taobao.weex.dom.action;

import com.taobao.weex.WXSDKInstance;
import com.taobao.weex.adapter.IWXUserTrackAdapter;
import com.taobao.weex.common.WXErrorCode;
import com.taobao.weex.dom.DOMAction;
import com.taobao.weex.dom.DOMActionContext;
import com.taobao.weex.dom.RenderAction;
import com.taobao.weex.dom.RenderActionContext;
import com.taobao.weex.dom.WXDomObject;
import com.taobao.weex.ui.component.WXComponent;
import com.taobao.weex.ui.component.WXVContainer;

/**
 * Created by sospartan on 27/02/2017.
 */
final class RemoveElementAction implements DOMAction, RenderAction {
  private final String mRef;

  RemoveElementAction(String ref) {
    mRef = ref;
  }

  @Override
  public void executeDom(DOMActionContext context) {
    if (context.isDestory()) {
      return;
    }
    WXSDKInstance instance = context.getInstance();
    WXDomObject domObject = context.getDomByRef(mRef);
    if (domObject == null) {
      if (instance != null) {
        instance.commitUTStab(IWXUserTrackAdapter.DOM_MODULE, WXErrorCode.WX_ERR_DOM_REMOVEELEMENT);
      }
      return;
    }
    WXDomObject parent = domObject.parent;
    if (parent == null) {
      if (instance != null) {
        instance.commitUTStab(IWXUserTrackAdapter.DOM_MODULE, WXErrorCode.WX_ERR_DOM_REMOVEELEMENT);
      }
      return;
    }
    domObject.traverseTree(context.getRemoveElementConsumer());
    parent.remove(domObject);
    context.unregisterDOMObject(mRef);

    context.postRenderTask(this);

    if (instance != null) {
      instance.commitUTStab(IWXUserTrackAdapter.DOM_MODULE, WXErrorCode.WX_SUCCESS);
    }
  }

  @Override
  public void executeRender(RenderActionContext context) {
    WXComponent component = context.getComponent(mRef);
    if (component == null || component.getParent() == null) {
      return;
    }
    WXVContainer parent = component.getParent();
    clearRegistryForComponent(context, component);
    parent.remove(component, true);
    context.unregisterComponent(mRef);
  }

  private void clearRegistryForComponent(RenderActionContext context, WXComponent component) {
    WXComponent removedComponent = context.unregisterComponent(component.getDomObject().getRef());
    if (removedComponent != null) {
      removedComponent.removeAllEvent();
      removedComponent.removeStickyStyle();
    }
    if (component instanceof WXVContainer) {
      WXVContainer container = (WXVContainer) component;
      int count = container.childCount();
      for (int i = count - 1; i >= 0; --i) {
        clearRegistryForComponent(context, container.getChild(i));
      }
    }

  }
}