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/*
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (C) Alkacon Software (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.acacia.client;

import org.opencms.acacia.client.css.I_CmsLayoutBundle;
import org.opencms.acacia.client.ui.CmsAttributeValueView;
import org.opencms.acacia.client.ui.CmsValuePanel;
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 com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Style.Position;
import com.google.gwt.user.client.DOM;

/**
 * The drag and drop controller for attribute value sorting.

*/ public class CmsAttributeDNDController implements I_CmsDNDController { /** The drag overlay. */ private Element m_dragOverlay; /** The starting position. */ private int m_startPosition; /** * @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) { removeDragOverlay(); clearTargets(handler); // remove the drag helper reference from handler, to avoid helper.removeFromParent() call handler.setDragHelper(null); } /** * @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) */ public boolean onDragStart(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) { if ((target instanceof CmsValuePanel) && (draggable instanceof CmsAttributeValueView) && ((CmsAttributeValueView)draggable).isDragEnabled()) { installDragOverlay(); handler.setOrientation(Orientation.VERTICAL); m_startPosition = ((CmsAttributeValueView)draggable).getValueIndex(); handler.clearTargets(); handler.addTarget(target); target.getElement().getStyle().setPosition(Position.RELATIVE); target.getElement().insertBefore(handler.getPlaceholder(), draggable.getElement()); ((CmsValuePanel)target).highlightOutline(); 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) */ public void onDrop(I_CmsDraggable draggable, I_CmsDropTarget target, CmsDNDHandler handler) { CmsAttributeValueView attributeValue = (CmsAttributeValueView)draggable; int targetIndex = target.getPlaceholderIndex(); if (targetIndex > m_startPosition) { targetIndex--; } attributeValue.getHandler().moveAttributeValue(attributeValue, m_startPosition, targetIndex); removeDragOverlay(); clearTargets(handler); // remove the drag helper reference from handler, to avoid helper.removeFromParent() call handler.setDragHelper(null); } /** * @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) { ((CmsValuePanel)target).updateHighlightingPosition(); } /** * @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 } /** * Clears the handlers drag and drop targets.

* * @param handler the drag and drop handler */ private void clearTargets(final CmsDNDHandler handler) { ((CmsValuePanel)handler.getCurrentTarget()).removeHighlighting(); handler.getCurrentTarget().getElement().getStyle().clearPosition(); Scheduler.get().scheduleDeferred(new ScheduledCommand() { /** * @see com.google.gwt.user.client.Command#execute() */ public void execute() { handler.clearTargets(); } }); } /** * Installs the drag overlay to avoid any mouse over issues or similar.

*/ private void installDragOverlay() { if (m_dragOverlay != null) { m_dragOverlay.removeFromParent(); } m_dragOverlay = DOM.createDiv(); m_dragOverlay.addClassName(I_CmsLayoutBundle.INSTANCE.form().dragOverlay()); Document.get().getBody().appendChild(m_dragOverlay); } /** * Removes the drag overlay.

*/ private void removeDragOverlay() { if (m_dragOverlay != null) { m_dragOverlay.removeFromParent(); m_dragOverlay = null; } } }





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