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;
}
}
/**
* 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();
}
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();
}
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();
}
}
