@Override public void drop(DragAndDropEvent event) { WrapperTargetDetails ed = (WrapperTargetDetails) event.getTargetDetails(); Transferable ctr = event.getTransferable(); // use "component" (from DragDropPane) if available, else take // the source component Component component = null; if (ctr instanceof WrapperTransferable) { component = ((WrapperTransferable) ctr).getDraggedComponent(); } else if (ctr instanceof DataBoundTransferable) { // Item has been dragged, construct a Label from // Item id Label l = new Label(); l.setSizeUndefined(); l.setValue("ItemId : " + ((DataBoundTransferable) ctr).getItemId()); component = l; } if (component != null) { if (component.getParent() != root) { root.addComponent(component); Integer left = ed.getAbsoluteLeft(); Integer top = ed.getAbsoluteTop(); MouseEventDetails eventDetails = ed.getMouseEvent(); int clientX = eventDetails.getClientX(); int clientY = eventDetails.getClientY(); try { root.getPosition(component).setTopValue(Float.valueOf(clientY - top)); root.getPosition(component).setLeftValue(Float.valueOf(clientX - left)); } catch (Exception e) { } } else { // drag started and ended inside the this Pane MouseEventDetails start = ((WrapperTransferable) event.getTransferable()).getMouseDownEvent(); MouseEventDetails eventDetails = ed.getMouseEvent(); int deltaX = eventDetails.getClientX() - start.getClientX(); int deltaY = eventDetails.getClientY() - start.getClientY(); ComponentPosition p = root.getPosition(component); p.setTopValue(p.getTopValue() + deltaY); p.setLeftValue(p.getLeftValue() + deltaX); } } else { // drag coming outside of Vaadin WrapperTransferable wtr = (WrapperTransferable) ctr; String object = wtr.getText(); // String html = wtr.getHtml(); // String url = (String) ctr.getData("Url"); final Label l = new Label(); l.setCaption("Generated from HTML5 drag:"); if (object != null) { if (object.length() > 80) { object = object.substring(0, 79); } l.setValue(object); } else { l.setValue("HTML5 dd"); } Html5File[] files = wtr.getFiles(); if (files != null) { for (Html5File html5File : files) { l.setCaption(html5File.getFileName()); html5File.setStreamVariable( new StreamVariable() { ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); @Override public OutputStream getOutputStream() { return byteArrayOutputStream; } @Override public boolean listenProgress() { return false; } @Override public void onProgress(StreamingProgressEvent event) {} @Override public void streamingStarted(StreamingStartEvent event) {} @Override public void streamingFinished(StreamingEndEvent event) { l.setValue( (new String(byteArrayOutputStream.toByteArray()).substring(0, 80) + "...")); } @Override public void streamingFailed(StreamingErrorEvent event) {} @Override public boolean isInterrupted() { return false; } }); } } l.setSizeUndefined(); root.addComponent(l); } return; }