GroupItItem.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2014 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.zul.groupit;
 
import org.turro.string.Strings;
import org.turro.contacts.GroupIt;
import org.turro.i18n.I_;
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 GroupItItem extends Treeitem implements AfterCompose {
 
  private Treechildren children;
  private boolean loadOnDemand;
  private final String entityPath;
 
  public GroupItItem(GroupIt group, boolean loadOnDemand, String entityPath) {
    super();
    this.loadOnDemand = loadOnDemand;
    this.entityPath = entityPath;
    setValue(group);
    setLabel(group == null ? I_.get("All") : group.getName());
    setTooltiptext(getLabel());
  }
 
  @Override
  public GroupItTree getTree() {
    return (GroupItTree) super.getTree();
  }
 
  public GroupIt getGroup() {
    return (GroupIt) getValue();
  }
 
  public void showContents() {
    fillGroup();
    setOpen(true);
  }
 
  public void reloadContents() {
    if(!isLeaf() && children == null) {
      children = new Treechildren();
      appendChild(children);
    }
    if(children != null) {
      children.getChildren().clear();
      showContents();
    }
  }
 
  public boolean isLeaf() {
    GroupIt group = getGroup();
    if(Strings.isBlank(entityPath)) {
      return group == null ? 
              GroupIt.roots(getTree().getCategory()).isEmpty() : 
              group.children().isEmpty();
    } else {
      return group == null ? 
              GroupIt.roots(getTree().getCategory(), entityPath).isEmpty() : 
              group.children(entityPath).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()) {
          fillGroup();
        }
      }
    });
  }
 
  public GroupItItem addGroup(GroupIt group, boolean loadOnDemand) {
    GroupItItem cat = new GroupItItem(group, loadOnDemand, entityPath);
    children.appendChild(cat);
    cat.afterCompose();
    return cat;
  }
 
  private void fillGroup() {
    if(children != null && children.getChildren().isEmpty()) {
      GroupIt group = getGroup();
      if(Strings.isBlank(entityPath)) {
        for(GroupIt gpr : group == null ? 
                GroupIt.roots(getTree().getCategory()) : 
                group.children()) {
          addGroup(gpr, loadOnDemand);
        }
      } else {
        for(GroupIt gpr : group == null ? 
                GroupIt.roots(getTree().getCategory(), entityPath) : 
                group.children(entityPath)) {
          addGroup(gpr, loadOnDemand);
        }
      }
    }
  }
 
  private void addChildrenSpace() {
    if(!isLeaf()) {
      children = new Treechildren();
      appendChild(children);
      if(!loadOnDemand) {
        fillGroup();
        setOpen(true);
      }
    }
  }
 
  public boolean isLoadOnDemand() {
    return loadOnDemand;
  }
 
  public void setLoadOnDemand(boolean loadOnDemand) {
    this.loadOnDemand = loadOnDemand;
  }
 
  @Override
  public void afterCompose() {
    initLoadOnDemand();
    addChildrenSpace();
  }
 
}