/*
* Copyright 2010 The gwtquery plugins team.
*
* 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 gwtquery.plugins.draggable.client.plugins;
import com.google.gwt.query.client.GQuery;
import com.google.gwt.query.client.plugins.events.GqEvent;
import gwtquery.plugins.draggable.client.DraggableHandler;
import gwtquery.plugins.draggable.client.DraggableOptions;
import gwtquery.plugins.draggable.client.events.DragContext;
import static com.google.gwt.query.client.GQuery.$;
import static com.google.gwt.query.client.GQuery.body;
/**
* This add-on handles the css cursor to display during drag operation.
*
* @author Julien Dramaix (julien.dramaix@gmail.com, @jdramaix)
*/
public class CursorPlugin implements DraggablePlugin {
private static String OLD_CURSOR_KEY = "oldCursor";
private static String CURSOR_CSS = "cursor";
private boolean isStarting = false;
public String getName() {
return "cursor";
}
public boolean hasToBeExecuted(DraggableOptions options) {
return options.getCursor() != null;
}
public void onDrag(DraggableHandler handler, DragContext ctx, GqEvent e) {
// nothing to do
}
public void onStart(DraggableHandler handler, DragContext ctx,
GqEvent e) {
if (ctx.getInitialDraggable() == ctx.getDraggable() && !isStarting) {
isStarting = true;
GQuery $body = $(body);
String oldCursor = $body.css(CURSOR_CSS);
if (oldCursor != null) {
$body.data(OLD_CURSOR_KEY, oldCursor);
}
$body.css(CURSOR_CSS, handler.getOptions().getCursor().getCssName());
}
}
public void onStop(DraggableHandler handler, DragContext ctx, GqEvent e) {
if (ctx.getInitialDraggable() != ctx.getDraggable()) {
return;
}
GQuery $body = $(body);
String oldCursor = $body.data(OLD_CURSOR_KEY, String.class);
$body.css(CURSOR_CSS, oldCursor);
isStarting = false;
}
}