/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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 Lesser General Public License for more details.
*
* Copyright (c) 2002-2013 Pentaho Corporation.. All rights reserved.
*/
package org.pentaho.reporting.designer.core.editor.report;
import java.awt.datatransfer.DataFlavor;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import org.pentaho.reporting.designer.core.util.dnd.ElementMetaDataTransferable;
import org.pentaho.reporting.designer.core.util.dnd.FieldDescriptionTransferable;
import org.pentaho.reporting.designer.core.util.dnd.GenericDNDHandler;
import org.pentaho.reporting.engine.classic.core.metadata.ElementMetaData;
import org.pentaho.reporting.engine.classic.core.metadata.ElementType;
import org.pentaho.reporting.engine.classic.core.wizard.AutoGeneratorUtility;
import org.pentaho.reporting.engine.classic.core.wizard.ContextAwareDataSchemaModel;
import org.pentaho.reporting.engine.classic.core.wizard.DataAttributeContext;
import org.pentaho.reporting.engine.classic.core.wizard.DataAttributes;
import org.pentaho.reporting.engine.classic.core.wizard.DataSchema;
import org.pentaho.reporting.engine.classic.core.wizard.DefaultDataAttributeContext;
/**
* Todo: Document Me
*
* @author Thomas Morgner
*/
public class BandDndHandler extends GenericDNDHandler
{
private ReportElementDragHandler dragHandler;
private ReportElementEditorContext editorContext;
public BandDndHandler(final ReportElementEditorContext editorContext)
{
super(new DataFlavor[]
{ElementMetaDataTransferable.ELEMENT_FLAVOR,
FieldDescriptionTransferable.ELEMENT_FLAVOR});
this.editorContext = editorContext;
}
protected int updateDragOver(final DropTargetDragEvent event)
{
try
{
if (ElementMetaDataTransferable.ELEMENT_FLAVOR.equals(getFlavor()))
{
final ElementMetaData data = (ElementMetaData) getTransferData();
if (data == null)
{
return DnDConstants.ACTION_NONE;
}
if (dragHandler == null)
{
dragHandler = createDragHandler(data);
if (dragHandler == null)
{
return DnDConstants.ACTION_NONE;
}
return dragHandler.dragStarted(event, editorContext, data, null);
}
else
{
return dragHandler.dragUpdated(event, editorContext, data, null);
}
}
if (FieldDescriptionTransferable.ELEMENT_FLAVOR.equals(getFlavor()))
{
final String fieldName = (String) getTransferData();
final ElementMetaData data = createMetaData(fieldName);
if (data == null)
{
return DnDConstants.ACTION_NONE;
}
if (dragHandler == null)
{
dragHandler = createDragHandler(data);
if (dragHandler == null)
{
return DnDConstants.ACTION_NONE;
}
return dragHandler.dragStarted(event, editorContext, data, fieldName);
}
else
{
return dragHandler.dragUpdated(event, editorContext, data, fieldName);
}
}
return DnDConstants.ACTION_NONE;
}
finally
{
editorContext.getRepresentationContainer().revalidate();
editorContext.getRepresentationContainer().repaint();
}
}
private ReportElementDragHandler createDragHandler(final ElementMetaData metaData)
{
if (metaData == null)
{
return null;
}
ReportElementEditor elementEditor = ReportElementEditorRegistry.getInstance().getPlugin(metaData.getName());
if (elementEditor == null)
{
elementEditor = ReportElementEditorRegistry.getInstance().getPlugin(null);
if (elementEditor == null)
{
return null;
}
}
return elementEditor.createDragHandler();
}
/**
* Called while a drag operation is ongoing, when the mouse pointer has exited the operable part of the drop site
* for the <code>DropTarget</code> registered with this listener.
*
* @param dte the <code>DropTargetEvent</code>
*/
public void dragExit(final DropTargetEvent dte)
{
if (dragHandler == null)
{
super.dragExit(dte);
return;
}
dragHandler.dragAborted(dte, editorContext);
dragHandler = null;
super.dragExit(dte);
editorContext.getRepresentationContainer().revalidate();
editorContext.getRepresentationContainer().repaint();
}
public void drop(final DropTargetDropEvent dtde)
{
if (dragHandler == null)
{
dtde.rejectDrop();
return;
}
try
{
if (ElementMetaDataTransferable.ELEMENT_FLAVOR.equals(getFlavor()))
{
final ElementMetaData metaData = (ElementMetaData) getTransferData();
dragHandler.drop(dtde, editorContext, metaData, null);
return;
}
if (FieldDescriptionTransferable.ELEMENT_FLAVOR.equals(getFlavor()))
{
final String fieldName = (String) getTransferData();
final ElementMetaData metaData = createMetaData(fieldName);
dragHandler.drop(dtde, editorContext, metaData, fieldName);
return;
}
dtde.rejectDrop();
}
finally
{
editorContext.getRepresentationContainer().revalidate();
editorContext.getRepresentationContainer().repaint();
dragHandler = null;
}
}
private ElementMetaData createMetaData(final String fieldName)
{
final ContextAwareDataSchemaModel model = editorContext.getRenderContext().getReportDataSchemaModel();
final DataSchema dataSchema = model.getDataSchema();
final DataAttributes attributes = dataSchema.getAttributes(fieldName);
final DataAttributeContext dataAttributeContext = new DefaultDataAttributeContext();
if (attributes == null)
{
return null;
}
final ElementType type = AutoGeneratorUtility.createFieldType(attributes, dataAttributeContext);
if (type == null)
{
return null;
}
return type.getMetaData();
}
}