ContextItem.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.elephant.web;
 
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.Events;
import org.zkoss.zul.Treecell;
import org.zkoss.zul.Treechildren;
import org.zkoss.zul.Treeitem;
import org.zkoss.zul.Treerow;
 
public class ContextItem extends Treeitem {
 
  private final ElContext context;
  private boolean loadOnDemand;
  private Treechildren children;
 
  public ContextItem(ElContext context, boolean loadOnDemand) {
    this.context = context;
    this.loadOnDemand = loadOnDemand;
    initLoadOnDemand();
    addCells();
    if(!context.getStaticChildren().isEmpty()) addChildrenSpace();
  }
 
  @Override
  public ContextTree getTree() {
    return (ContextTree) super.getTree();
  }
 
  public ElContext getElContext() {
    return context;
  }
 
  public ContextItem addContext(ElContext context, boolean loadOnDemand) {
    ContextItem ci = new ContextItem(context, loadOnDemand);
    children.appendChild(ci);
    return ci;
  }
 
  public void showContents() {
    if(children != null) {
      fillFolder();
      setOpen(true);
    }
  }
 
  public void reloadContents() {
    if(children != null) {
      children.getChildren().clear();
      showContents();
    }
  }
 
  private void addChildrenSpace() {
    children = new Treechildren();
    appendChild(children);
    if(!loadOnDemand) {
      fillFolder();
      setOpen(loadOnDemand);
    }
  }
 
  private void addCells() {
    Treerow row = new Treerow();
    appendChild(row);
    Treecell cell = new Treecell(context.getId());
    row.appendChild(cell);
    setImage("/_zul/images/www_context.png");
  }
 
  public boolean isLoadOnDemand() {
    return loadOnDemand;
  }
 
  public void setLoadOnDemand(boolean loadOnDemand) {
    this.loadOnDemand = loadOnDemand;
  }
 
  private void initLoadOnDemand() {
    if(!loadOnDemand) return;
 
    setOpen(false);
 
    addEventListener(Events.ON_OPEN, (Event event) -> {
      if(isOpen()) {
        fillFolder();
      }
    });
  }
 
  private void fillFolder() {
    if(children != null && children.getChildren().isEmpty()) {
      for(ElContext ctx : context.getStaticChildren()) {
        addContext(ctx, loadOnDemand);
      }
    }
  }
 
}