/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* For further information about Alkacon Software, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.gwt.client.ui.tree;
import com.google.gwt.event.logical.shared.OpenEvent;
import com.google.gwt.user.client.Timer;
/**
* Lazy list tree open handler abstract implementation.<p>
*
* @param <I> the specific lazy tree item implementation
*
* @since 8.0.0
*
* @see org.opencms.gwt.client.ui.tree.CmsLazyTree
* @see org.opencms.gwt.client.ui.tree.CmsLazyTreeItem
* @see org.opencms.gwt.client.ui.tree.I_CmsLazyOpenHandler
*/
public abstract class A_CmsLazyOpenHandler<I extends CmsLazyTreeItem> implements I_CmsLazyOpenHandler<I> {
/**
* Timer for showing the loading message.<p>
*/
private final class OpenTimer extends Timer {
/** The tree item to open. */
private I m_target;
/**
* Default constructor.<p>
*
* @param target the tree item to open
*/
public OpenTimer(I target) {
m_target = target;
}
/**
* @see com.google.gwt.user.client.Timer#run()
*/
@Override
public void run() {
m_target.setOpen(true);
}
}
/**
* @see org.opencms.gwt.client.ui.tree.I_CmsLazyOpenHandler#onOpen(com.google.gwt.event.logical.shared.OpenEvent)
*/
public void onOpen(OpenEvent<I> event) {
I target = event.getTarget();
if (target.getLoadState() != CmsLazyTreeItem.LoadState.UNLOADED) {
return;
}
new OpenTimer(target).schedule(500);
target.onStartLoading();
target.setOpen(false);
load(target);
}
}