com.extjs.gxt.ui.client.dnd.ListViewDragSource.java Source code

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Here is the source code for com.extjs.gxt.ui.client.dnd.ListViewDragSource.java

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/*
 * Sencha GXT 2.3.1 - Sencha for GWT
 * Copyright(c) 2007-2013, Sencha, Inc.
 * licensing@sencha.com
 * 
 * http://www.sencha.com/products/gxt/license/
 */
package com.extjs.gxt.ui.client.dnd;

import java.util.List;

import com.extjs.gxt.ui.client.GXT;
import com.extjs.gxt.ui.client.data.ModelData;
import com.extjs.gxt.ui.client.dnd.DND.Operation;
import com.extjs.gxt.ui.client.event.ComponentEvent;
import com.extjs.gxt.ui.client.event.DNDEvent;
import com.extjs.gxt.ui.client.event.Events;
import com.extjs.gxt.ui.client.event.Listener;
import com.extjs.gxt.ui.client.util.Format;
import com.extjs.gxt.ui.client.widget.ListView;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeHtmlUtils;
import com.google.gwt.user.client.Element;

/**
 * A <code>DragSource</code> implementation for ListViews. Supports both single
 * and multi-selections. The selected model instances will be set as the data to
 * be dragged.
 */
public class ListViewDragSource extends DragSource {

    protected ListView<ModelData> listView;

    /**
     * Creates a new list view drag source instance.
     * 
     * @param listView the source list view
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public ListViewDragSource(ListView listView) {
        super(listView);
        this.listView = listView;
        setStatusText(GXT.MESSAGES.listField_itemsSelected(listView.getSelectionModel().getSelectedItems().size()));

        listView.addListener(Events.OnMouseDown, new Listener<ComponentEvent>() {
            public void handleEvent(ComponentEvent be) {
                be.cancelBubble();
                ListViewDragSource.this.listView.focus();
            }
        });
    }

    /**
     * Returns the sources list view.
     * 
     * @return the list view
     */
    public ListView<ModelData> getListView() {
        return listView;
    }

    @Override
    @SuppressWarnings({ "unchecked", "rawtypes" })
    protected void onDragDrop(DNDEvent e) {
        if (e.getOperation() == Operation.MOVE) {
            Object data = e.getData();
            if (data instanceof ModelData) {
                listView.getStore().remove((ModelData) data);
            } else if (data instanceof List) {
                List<ModelData> sel = (List) data;
                for (ModelData m : sel) {
                    listView.getStore().remove(m);
                }
            }
        }
    }

    @Override
    protected void onDragStart(DNDEvent e) {
        Element r = listView.findElement((Element) e.getDragEvent().getStartElement());
        if (r == null) {
            e.setCancelled(true);
            return;
        }

        List<ModelData> sel = listView.getSelectionModel().getSelectedItems();
        if (sel.size() > 0) {
            e.setCancelled(false);
            e.setData(sel);

            if (getStatusText() == null) {
                e.getStatus().update(GXT.MESSAGES.grid_ddText(sel.size()));
            } else {
                e.getStatus().update(SafeHtmlUtils.fromString(Format.substitute(getStatusText(), sel.size())));
            }
        }
    }

}