DDTest7.java

package com.vaadin.tests.dd;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import com.vaadin.event.dd.DragAndDropEvent;
import com.vaadin.event.dd.DropHandler;
import com.vaadin.event.dd.acceptcriteria.AcceptCriterion;
import com.vaadin.tests.components.TestBase;
import com.vaadin.tests.util.Person;
import com.vaadin.tests.util.PersonContainer;
import com.vaadin.tests.util.TestUtils;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.UI;
import com.vaadin.v7.data.Item;
import com.vaadin.v7.data.util.IndexedContainer;
import com.vaadin.v7.event.DataBoundTransferable;
import com.vaadin.v7.ui.AbstractSelect.AbstractSelectTargetDetails;
import com.vaadin.v7.ui.Table;

public class DDTest7 extends TestBase {

    java.util.Random r = new java.util.Random(1);

    HorizontalLayout hl = new HorizontalLayout();
    Table table = new Table(
            "Drag and drop sortable table with lazy loading rule. Dragged row can only be accepted after hevier row (weigh column). If starting from topmost row in viewport, heviests will end up on top.");

    @Override
    protected void setup() {
        UI w = getLayout().getUI();

        TestUtils.injectCSS(w,
                ".v-table-row-drag-middle .v-table-cell-content {"
                        + "        background-color: inherit ; border-bottom: 1px solid cyan;"
                        + "}"
                        + ".v-table-row-drag-middle .v-table-cell-wrapper {"
                        + "        margin-bottom: -1px;" + "}" + ""
                        // always show the drop hint below
                        + ".v-table-row-drag-top .v-table-cell-content {"
                        + "border-top: 0; margin-top:0;border-bottom:1px solid cyan;"
                        + "        margin-bottom: -1px;" + "}" + ""

        );

        // hl.addComponent(tree1);
        hl.addComponent(table);
        // hl.addComponent(tree2);
        hl.setWidth("100%");
        hl.setSpacing(true);
        hl.setExpandRatio(table, 1);
        table.setWidth("100%");
        table.setPageLength(10);
        table.setRowHeaderMode(Table.ROW_HEADER_MODE_ID);
        table.setSelectable(true);
        table.setMultiSelect(true);
        populateTable();
        addComponent(hl);

        /*
         * Make table rows draggable
         */
        table.setDragMode(Table.TableDragMode.ROW);

        table.setDropHandler(new DropHandler() {
            // accept only drags from this table
            AcceptCriterion crit = new Table.TableDropCriterion() {
                @Override
                protected Set<Object> getAllowedItemIds(
                        DragAndDropEvent dragEvent, Table table,
                        Collection<Object> visibleItemIds) {

                    Object draggedItemId = ((Table.TableTransferable) dragEvent
                            .getTransferable()).getItemId();
                    Integer weightOfDraggedRow = (Integer) table
                            .getItem(draggedItemId).getItemProperty("Weight")
                            .getValue();

                    HashSet<Object> accepted = new HashSet<>();
                    for (Object itemId : visibleItemIds) {
                        Item item = table.getItem(itemId);
                        Integer w = (Integer) item.getItemProperty("Weight")
                                .getValue();
                        if (weightOfDraggedRow < w) {
                            accepted.add(itemId);
                        }

                    }
                    return accepted;
                }
            };

            @Override
            public AcceptCriterion getAcceptCriterion() {
                return crit;
            }

            @Override
            public void drop(DragAndDropEvent dropEvent) {
                AbstractSelectTargetDetails dropTargetData = (AbstractSelectTargetDetails) dropEvent
                        .getTargetDetails();
                DataBoundTransferable transferable = (DataBoundTransferable) dropEvent
                        .getTransferable();
                Object itemIdOver = dropTargetData.getItemIdOver();
                Object itemId = transferable.getItemId();
                if (itemId == null || itemIdOver == null
                        || itemId.equals(itemIdOver)) {
                    return; // no move happened
                }

                // IndexedContainer goodies... (hint: don't use it in real apps)
                IndexedContainer containerDataSource = (IndexedContainer) table
                        .getContainerDataSource();
                int newIndex = containerDataSource.indexOfId(itemIdOver) - 1;
                // always add after
                newIndex++;
                if (newIndex < 0) {
                    newIndex = 0;
                }
                Object idAfter = containerDataSource.getIdByIndex(newIndex);
                Collection<?> selections = (Collection<?>) table.getValue();
                if (selections != null && selections.contains(itemId)) {
                    // dragged a selected item, if multiple rows selected, drag
                    // them too (functionality similar to apple mail)
                    for (Object object : selections) {
                        moveAfter(containerDataSource, object, idAfter);
                    }

                } else {
                    // move just the dragged row, not considering selection at
                    // all
                    moveAfter(containerDataSource, itemId, idAfter);
                }

            }

            private void moveAfter(IndexedContainer containerDataSource,
                    Object itemId, Object idAfter) {
                try {
                    IndexedContainer clone = null;
                    clone = (IndexedContainer) containerDataSource.clone();
                    containerDataSource.removeItem(itemId);
                    Item newItem = containerDataSource.addItemAfter(idAfter,
                            itemId);
                    Item item = clone.getItem(itemId);
                    for (Object propId : item.getItemPropertyIds()) {
                        newItem.getItemProperty(propId).setValue(
                                item.getItemProperty(propId).getValue());
                    }

                } catch (CloneNotSupportedException e) {
                    e.printStackTrace();
                }

            }
        });

    }

    private void populateTable() {
        table.addContainerProperty("Name", String.class, "");
        table.addContainerProperty("Weight", Integer.class, 0);

        PersonContainer testData = PersonContainer.createWithTestData();

        for (int i = 0; i < 40; i++) {
            Item addItem = table.addItem("Item" + i);
            Person p = testData.getIdByIndex(i);
            addItem.getItemProperty("Name")
                    .setValue(p.getFirstName() + " " + p.getLastName());
            addItem.getItemProperty("Weight").setValue(50 + r.nextInt(60));
        }

    }

    @Override
    protected String getDescription() {
        return "dd";
    }

    @Override
    protected Integer getTicketNumber() {
        return 119;
    }

}