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;
}
}
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();
}
}