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OpenCms is an enterprise-ready, easy to use website content management system based on Java and XML technology. Offering a complete set of features, OpenCms helps content managers worldwide to create and maintain beautiful websites fast and efficiently.
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/*
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (c) Alkacon Software GmbH & Co. KG (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.ade.containerpage.client;

import org.opencms.gwt.client.dnd.CmsDNDHandler;
import org.opencms.gwt.client.dnd.CmsDNDHandler.Orientation;
import org.opencms.gwt.client.dnd.I_CmsDNDController;
import org.opencms.gwt.client.dnd.I_CmsDraggable;
import org.opencms.gwt.client.dnd.I_CmsDropTarget;
import org.opencms.gwt.client.ui.CmsList;
import org.opencms.gwt.client.ui.CmsListItem;

import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;

/**
 * The favorites editing drag and drop controller.
 *
 * @since 8.0.0
 */
public class CmsFavoritesDNDController implements I_CmsDNDController {

    /** The starting position. */
    private int m_startPosition;

    /** The sortable list. */
    private CmsList m_list;

    /**
     * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onAnimationStart(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler)
     */
    public void onAnimationStart(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) {

        // nothing to do
    }

    /**
     * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onBeforeDrop(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler)
     */
    public boolean onBeforeDrop(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) {

        // nothing to do
        return true;
    }

    /**
     * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onDragCancel(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler)
     */
    public void onDragCancel(I_CmsDraggable draggable, I_CmsDropTarget target, final CmsDNDHandler handler) {

        m_list.insertItem((CmsListItem)draggable, m_startPosition);
        Scheduler.get().scheduleDeferred(new ScheduledCommand() {

            /**
             * @see com.google.gwt.user.client.Command#execute()
             */
            public void execute() {

                handler.clearTargets();
            }
        });

    }

    /**
     * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onDragStart(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler)
     */
    @SuppressWarnings("unchecked")
    public boolean onDragStart(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) {

        handler.setOrientation(Orientation.VERTICAL);
        if ((target instanceof CmsList) && (draggable instanceof CmsListItem)) {
            m_list = (CmsList)target;
            m_startPosition = m_list.getItemPosition((CmsListItem)draggable);
            handler.clearTargets();
            handler.addTarget(target);
            target.getElement().insertBefore(handler.getPlaceholder(), draggable.getElement());
            return true;
        }
        return false;
    }

    /**
     * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onDrop(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler)
     */
    @SuppressWarnings("unchecked")
    public void onDrop(I_CmsDraggable draggable, I_CmsDropTarget target, final CmsDNDHandler handler) {

        if (target instanceof CmsList) {
            CmsList list = (CmsList)target;
            if (list.getWidgetCount() > target.getPlaceholderIndex()) {
                list.insertItem((CmsListItem)draggable, target.getPlaceholderIndex());
            } else {
                list.addItem((CmsListItem)draggable);
            }
        }
        Scheduler.get().scheduleDeferred(new ScheduledCommand() {

            /**
             * @see com.google.gwt.user.client.Command#execute()
             */
            public void execute() {

                handler.clearTargets();
            }
        });

    }

    /**
     * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onPositionedPlaceholder(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler)
     */
    public void onPositionedPlaceholder(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) {

        // nothing to do
    }

    /**
     * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onTargetEnter(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler)
     */
    public boolean onTargetEnter(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) {

        return true;
    }

    /**
     * @see org.opencms.gwt.client.dnd.I_CmsDNDController#onTargetLeave(org.opencms.gwt.client.dnd.I_CmsDraggable, org.opencms.gwt.client.dnd.I_CmsDropTarget, org.opencms.gwt.client.dnd.CmsDNDHandler)
     */
    public void onTargetLeave(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) {

        // nothing to do
    }

}