Examples of com.vaadin.event.dd.TargetDetails

com.vaadin.event.dd.TargetDetails
TargetDetails wraps drop target related information about {@link DragAndDropEvent}.
When a TargetDetails object is used in {@link DropHandler} it is oftenpreferable to cast the TargetDetails to an implementation provided by DropTarget like {@link TreeTargetDetails}. They often provide a better typed, drop target specific API. @since 6.3

    private TargetDetails constructDragDropDetails(DropTarget dropTarget,
            Map<String, Object> variables) {
        Map<String, Object> rawDragDropDetails = (Map<String, Object>) variables
                .get("evt");


        TargetDetails dropData = dropTarget
                .translateDropTargetDetails(rawDragDropDetails);


        if (dropData == null) {
            // Create a default DragDropDetails with all the raw variables
            dropData = new TargetDetailsImpl(rawDragDropDetails, dropTarget);

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            m_right = right;
        }


        public void drop(DragAndDropEvent event) {
            Transferable transferable = event.getTransferable();
            TargetDetails targetDetails = event.getTargetDetails();
            if (transferable instanceof TableTransferable) {
                TableTransferable tt = (TableTransferable) transferable;
                Object fromItemId = tt.getItemId();
                // get the active selection, but only if we drag from the same table
                Set<?> selection = m_associations.isActiveTable(tt.getSourceComponent()) ? m_associations.getActiveSelection() : null;

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         * Construct the Transferable and the DragDropDetails for the drop
         * operation based on the info passed from the client widgets (drag
         * source for Transferable, drop target for DragDropDetails).
         */
        Transferable transferable = constructTransferable(dropTarget, variables);
        TargetDetails dropData = constructDragDropDetails(dropTarget, variables);
        DragAndDropEvent dropEvent = new DragAndDropEvent(transferable,
                dropData);
        if (dropHandler.getAcceptCriterion().accept(dropEvent)) {
            dropHandler.drop(dropEvent);
        }

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         * Construct the Transferable and the DragDropDetails for the drag
         * operation based on the info passed from the client widgets (drag
         * source for Transferable, current target for DragDropDetails).
         */
        Transferable transferable = constructTransferable(dropTarget, variables);
        TargetDetails dragDropDetails = constructDragDropDetails(dropTarget,
                variables);


        dragEvent = new DragAndDropEvent(transferable, dragDropDetails);


        lastVisitAccepted = acceptCriterion.accept(dragEvent);

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    private TargetDetails constructDragDropDetails(DropTarget dropTarget,
            Map<String, Object> variables) {
        Map<String, Object> rawDragDropDetails = (Map<String, Object>) variables
                .get("evt");


        TargetDetails dropData = dropTarget
                .translateDropTargetDetails(rawDragDropDetails);


        if (dropData == null) {
            // Create a default DragDropDetails with all the raw variables
            dropData = new TargetDetailsImpl(rawDragDropDetails, dropTarget);

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         * Construct the Transferable and the DragDropDetails for the drop
         * operation based on the info passed from the client widgets (drag
         * source for Transferable, drop target for DragDropDetails).
         */
        Transferable transferable = constructTransferable(dropTarget, variables);
        TargetDetails dropData = constructDragDropDetails(dropTarget, variables);
        DragAndDropEvent dropEvent = new DragAndDropEvent(transferable,
                dropData);
        if (dropHandler.getAcceptCriterion().accept(dropEvent)) {
            dropHandler.drop(dropEvent);
        }

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         * Construct the Transferable and the DragDropDetails for the drag
         * operation based on the info passed from the client widgets (drag
         * source for Transferable, current target for DragDropDetails).
         */
        Transferable transferable = constructTransferable(dropTarget, variables);
        TargetDetails dragDropDetails = constructDragDropDetails(dropTarget,
                variables);


        dragEvent = new DragAndDropEvent(transferable, dragDropDetails);


        lastVisitAccepted = acceptCriterion.accept(dragEvent);

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    private TargetDetails constructDragDropDetails(DropTarget dropTarget,
            Map<String, Object> variables) {
        Map<String, Object> rawDragDropDetails = (Map<String, Object>) variables
                .get("evt");


        TargetDetails dropData = dropTarget
                .translateDropTargetDetails(rawDragDropDetails);


        if (dropData == null) {
            // Create a default DragDropDetails with all the raw variables
            dropData = new TargetDetailsImpl(rawDragDropDetails, dropTarget);

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        public void drop(DragAndDropEvent dropEvent) {
            Transferable transferable = dropEvent.getTransferable();
            Component sourceComponent = transferable.getSourceComponent();


            TargetDetails dropTargetData = dropEvent.getTargetDetails();
            DropTarget target = dropTargetData.getTarget();


            if (sourceComponent.getParent() != layout) {
                AbstractComponent c = getWrappedComponent(
                        createComponentFromPaletteItem(
                                sourceComponent.getCaption(), null), this);


                int index = 0;
                Iterator<Component> componentIterator = layout
                        .getComponentIterator();
                Component next = null;
                while (next != target && componentIterator.hasNext()) {
                    next = componentIterator.next();
                    if (next != sourceComponent) {
                        index++;
                    }
                }


                if (dropTargetData.getData("verticalLocation").equals(
                        VerticalDropLocation.TOP.toString())) {
                    index--;
                    if (index <= 0) {
                        index = 1;
                    }
                }


                layout.addComponent(c, index);
            }


            if (sourceComponent instanceof WrappedComponent) {
                // find the location where to move the dragged component
                boolean sourceWasAfterTarget = true;
                int index = 0;
                Iterator<Component> componentIterator = layout
                        .getComponentIterator();
                Component next = null;
                while (next != target && componentIterator.hasNext()) {
                    next = componentIterator.next();
                    if (next != sourceComponent) {
                        index++;
                    } else {
                        sourceWasAfterTarget = false;
                    }
                }
                if (next == null || next != target) {
                    // component not found - if dragging from another layout
                    return;
                }


                // drop on top of target?
                if (dropTargetData.getData("verticalLocation").equals(
                        VerticalDropLocation.MIDDLE.toString())) {
                    if (sourceWasAfterTarget) {
                        index--;
                    }
                }


                // drop before the target?
                else if (dropTargetData.getData("verticalLocation").equals(
                        VerticalDropLocation.TOP.toString())) {
                    index--;
                    if (index <= 0) {
                        index = 1;
                    }

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