EntityTreeItem.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2021 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.entities;
 
import java.util.Collections;
import java.util.List;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.EventListener;
import org.zkoss.zk.ui.event.Events;
import org.zkoss.zk.ui.ext.AfterCompose;
import org.zkoss.zul.Treechildren;
import org.zkoss.zul.Treeitem;
 
public class EntityTreeItem extends Treeitem implements AfterCompose {
 
  private Treechildren children;
  private boolean loadOnDemand;
 
  public EntityTreeItem(IElephantEntity entity, boolean loadOnDemand) {
    super();
    this.loadOnDemand = loadOnDemand;
    setValue(entity);
    setLabel(entity.getName());
    setTooltiptext(getLabel());
  }
 
  @Override
  public EntityTree getTree() {
    return (EntityTree) super.getTree();
  }
 
  public IElephantEntity getCategory() {
    return (IElephantEntity) getValue();
  }
 
  public void showContents() {
    fillCategory();
    setOpen(true);
  }
 
  public void reloadContents() {
    if(children != null) {
      children.getChildren().clear();
      showContents();
    }
  }
 
  public boolean isLeaf() {
    return getEntityChildren().isEmpty();
  }
 
  private void initLoadOnDemand() {
    if(!loadOnDemand) return;
 
    setOpen(false);
 
    addEventListener(Events.ON_OPEN, new EventListener() {
      @Override
      public void onEvent(Event event) throws Exception {
        // load files and add folders
        if(isOpen()) {
          fillCategory();
        }
      }
    });
  }
 
  public EntityTreeItem addCategory(IElephantEntity category, boolean loadOnDemand) {
    EntityTreeItem cat = new EntityTreeItem(category, loadOnDemand);
    children.appendChild(cat);
    cat.afterCompose();
    return cat;
  }
 
  private void fillCategory() {
    if(children != null && children.getChildren().isEmpty()) {
      for(IElephantEntity cat : getEntityChildren()) {
        addCategory(cat, loadOnDemand);
      }
    }
  }
 
  private void addChildrenSpace() {
    if(!isLeaf()) {
      children = new Treechildren();
      appendChild(children);
      if(!loadOnDemand) {
        fillCategory();
        setOpen(true);
      }
    }
  }
 
  public boolean isLoadOnDemand() {
    return loadOnDemand;
  }
 
  public void setLoadOnDemand(boolean loadOnDemand) {
    this.loadOnDemand = loadOnDemand;
  }
 
  @Override
  public void afterCompose() {
    initLoadOnDemand();
    addChildrenSpace();
  }
 
  private List<IElephantEntity> entityChildren;
  
  private List<IElephantEntity> getEntityChildren() {
    if(entityChildren == null) {
      entityChildren = getCategory().getChildren();
    }
    if(entityChildren == null) {
      entityChildren = Collections.EMPTY_LIST;
    }
    return entityChildren;
  }
  
}