/*
* Copyright (c) 2009-2012 Lockheed Martin Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.eurekastreams.web.client.ui.pages.start.dragging;
import org.eurekastreams.server.action.request.start.ReorderGadgetRequest;
import org.eurekastreams.web.client.events.Observer;
import org.eurekastreams.web.client.events.UpdatedHistoryParametersEvent;
import org.eurekastreams.web.client.model.GadgetModel;
import org.eurekastreams.web.client.ui.Session;
import org.eurekastreams.web.client.ui.pages.start.GadgetPanel;
import org.eurekastreams.web.client.ui.pages.start.layouts.DropZonePanel;
import com.allen_sauer.gwt.dnd.client.DragContext;
import com.allen_sauer.gwt.dnd.client.DragEndEvent;
import com.allen_sauer.gwt.dnd.client.DragHandler;
import com.allen_sauer.gwt.dnd.client.DragStartEvent;
import com.allen_sauer.gwt.dnd.client.VetoDragException;
import com.google.gwt.user.client.ui.Widget;
/**
* The gadget drag handler.
*/
public class GadgetDragHandler implements DragHandler
{
/**
* The current tab.
*/
private Long tabId;
/**
* Default constructor.
*
* @param inTabId
* the tab id.
*/
public GadgetDragHandler(final Long inTabId)
{
tabId = inTabId;
Session.getInstance().getEventBus()
.addObserver(UpdatedHistoryParametersEvent.class, new Observer<UpdatedHistoryParametersEvent>()
{
public void update(final UpdatedHistoryParametersEvent event)
{
final String tabName = event.getParameters().get("tab");
if (tabName != null)
{
tabId = Long.valueOf(tabName);
}
}
}, true);
}
/**
* What happens when we're done drag and dropping.
*
* @param event
* the event that fires when dragging ends.
*/
public void onDragEnd(final DragEndEvent event)
{
final DragContext context = event.getContext();
final GadgetPanel gadgetZone = (GadgetPanel) context.draggable;
int zoneNumber = 0;
int zoneIndex = 0;
final Widget dropTarget = context.finalDropController.getDropTarget();
if (dropTarget instanceof DropZonePanel)
{
final DropZonePanel dropPanel = (DropZonePanel) dropTarget;
zoneNumber = dropPanel.getZoneNumber();
zoneIndex = dropPanel.getVisibleGadgetPosition(gadgetZone);
}
gadgetZone.setDropZone(dropTarget);
GadgetModel.getInstance().reorder(
new ReorderGadgetRequest(tabId, gadgetZone.getGadgetData().getId(), zoneNumber, zoneIndex));
// Not rerendering here because FF has an issue with rpc communitcations breaking afterwards.
// gadgetZone.rerender();
}
/**
* What happens when we start dragging (nothing).
*
* @param event
* the event that fires when dragging starts.
*/
public void onDragStart(final DragStartEvent event)
{
}
/**
* What happens right before we stop dragging (nothing).
*
* @param event
* the event that fires right before dragging ends.
* @throws VetoDragException
* thrown to "veto" ending the drag.
*/
public void onPreviewDragEnd(final DragEndEvent event) throws VetoDragException
{
}
/**
* What happens right before we start dragging. Int his case, we want to widen the spacer widget from 1px to 30 px
* to make it easier to drop into empty columns.
*
* @param event
* the event that fires right before dragging starts.
* @throws VetoDragException
* thrown to "veto" starting the drag.
*/
public void onPreviewDragStart(final DragStartEvent event) throws VetoDragException
{
}
}