How to use

DropEvent

in

org.pentaho.ui.xul.dnd

public void onDragFromLocalTable( DropEvent event ) {
 event.setAccepted( true );
}

 UIRepositoryDirectory targetDirectory = null;
 if ( event.getDropParent() != null && event.getDropParent() instanceof UIRepositoryDirectory ) {
  targetDirectory = (UIRepositoryDirectory) event.getDropParent();
  if ( event.getDataTransfer().getData().size() > 0 ) {
   for ( Object o : event.getDataTransfer().getData() ) {
    if ( o instanceof UIRepositoryObject ) {
     moveList.add( (UIRepositoryObject) o );
   moveFiles( moveList, targetDirectory );
   event.getDataTransfer().setData( dirList );
 if ( mainController == null || !mainController.handleLostRepository( e ) ) {
  result = false;
  event.setAccepted( false );
  messageBox.setTitle( BaseMessages.getString( PKG, "Dialog.Error" ) );
  messageBox.setAcceptLabel( BaseMessages.getString( PKG, "Dialog.Ok" ) );
event.setAccepted( result );
try {
 directoryBinding.fireSourceChanged();

@Bindable
public void checkDropLocation( DropEvent event ) {
 List<Object> data = event.getDataTransfer().getData();
 for ( Object obj : data ) {
  if ( obj instanceof AbstractMetaDataModelNode && event.getDropParent() != null ) {
   event.setAccepted( ( (AbstractMetaDataModelNode) event.getDropParent() ).acceptsDrop( obj ) );
  }
 }
}

public void onModelDrop( DropEvent event ) throws ModelerException {
 try {
  IDropTarget dropNode = (IDropTarget) event.getDropParent();
  Object newData = null;
  for ( Object data : event.getDataTransfer().getData() ) {
   newData = dropNode.onDrop( data );
  }
  if ( newData == null ) {
   event.setAccepted( false );
  } else {
   event.getDataTransfer().setData( Collections.singletonList( newData ) );
  }
 } catch ( ModelerException e ) {
  throw e;
 }
}

public void onDragFromGlobalTree( DropEvent event ) {
 for ( UIRepositoryDirectory uiRepositoryDirectory : this.getSelectedFolderItems() ) {
  String path = uiRepositoryDirectory.getDirectory().getPath();
  if ( path.equals( HOME_PATH ) || path.equals( PUBLIC_PATH ) ) {
   event.setAccepted( false );
   return;
  }
 }
 event.setAccepted( true );
}

if ( ( (ILockObject) contentToLock ).isLocked() ) {
 event.setAccepted( false );
 messageBox.setTitle( BaseMessages.getString( PKG, "Dialog.Error" ) ); //$NON-NLS-1$
 messageBox.setAcceptLabel( BaseMessages.getString( PKG, "Dialog.Ok" ) ); //$NON-NLS-1$
 && repositoryDirectoryHasLockedObject( event, (UIRepositoryDirectory) ro ) ) {
event.setAccepted( false );
break;

private boolean areAnyRepositoryObjectsLocked( DropEvent event, UIRepositoryObjects repositoryObjects )
 throws KettleException {
 for ( UIRepositoryObject ro : repositoryObjects ) {
  if ( ro instanceof ILockObject ) {
   final UIRepositoryContent contentToLock = (UIRepositoryContent) ro;
   if ( ( (ILockObject) contentToLock ).isLocked() ) {
    // Content is locked, move is not allowed.
    event.setAccepted( false );
    messageBox.setTitle( BaseMessages.getString( PKG, "Dialog.Error" ) ); //$NON-NLS-1$
    messageBox.setAcceptLabel( BaseMessages.getString( PKG, "Dialog.Ok" ) ); //$NON-NLS-1$
    messageBox.setMessage( BaseMessages.getString( PKG, "BrowseController.FolderMoveNotAllowed" ) ); //$NON-NLS-1$
    messageBox.open();
    return true;
   }
  }
 }
 return false;
}

@Bindable
public void onModelTreeDrop( DropEvent event ) {
 try {
  if ( getModelerPerspective() == ModelerPerspective.ANALYSIS ) {
   dimTreeHelper.onModelDrop( event );
  } else {
   catTreeHelper.onModelDrop( event );
  }
 } catch ( Exception e ) {
  event.setAccepted( false );
  try {
   XulMessageBox msg = null; //$NON-NLS-1$
   msg = (XulMessageBox) document.createElement( "messagebox" );
   msg.setTitle( ModelerMessagesHolder.getMessages().getString( "invalid_model" ) ); //$NON-NLS-1$
   msg.setMessage( e.getCause().getMessage() );
   msg.open();
  } catch ( Exception e1 ) {
   e1.printStackTrace();
  }
 }
}