/*
* 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.DraggableOptions.HelperType;
import gwtquery.plugins.draggable.client.events.DragContext;
import static com.google.gwt.query.client.GQuery.$;
/**
* This add-on handle opacity of the helper
*
* @author Julien Dramaix (julien.dramaix@gmail.com, @jdramaix)
*/
public class OpacityPlugin implements DraggablePlugin {
private static String OLD_OPACITY_KEY = "oldOpacity";
private static String OPACITY_CSS_KEY = "opacity";
public String getName() {
return "opacity";
}
public boolean hasToBeExecuted(DraggableOptions options) {
Float opacity = options.getOpacity();
return opacity != null && opacity.floatValue() >= 0;
}
public void onDrag(DraggableHandler handler, DragContext ctx, GqEvent e) {
// do nothing
}
public void onStart(DraggableHandler handler, DragContext ctx,
GqEvent e) {
Float opacity = handler.getOptions().getOpacity();
GQuery $helper = handler.getHelper();
double oldOpacity = $helper.cur(OPACITY_CSS_KEY, true);
$helper.data(OLD_OPACITY_KEY, new Double(oldOpacity));
$helper.css(OPACITY_CSS_KEY, opacity.toString());
}
public void onStop(DraggableHandler handler, DragContext ctx, GqEvent e) {
GQuery $element = (handler.getOptions().getHelperType() == HelperType.ORIGINAL) ? handler.getHelper() : $(ctx.getDraggable());
if ($element == null || $element.length() == 0) {
return;
}
if ($element.data(OLD_OPACITY_KEY) == null) {
return;
}
Double oldOpacity = $element.data(OLD_OPACITY_KEY, Double.class);
$element.css(OPACITY_CSS_KEY, oldOpacity != null ? String.valueOf(oldOpacity) : "");
$element.removeData(OLD_OPACITY_KEY);
}
}