/*
* Copyright 2000-2014 Vaadin Ltd.
*
* 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 com.vaadin.client.extensions;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.IFrameElement;
import com.google.gwt.dom.client.Style;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.dom.client.Style.Visibility;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;
import com.vaadin.client.ComponentConnector;
import com.vaadin.client.ServerConnector;
import com.vaadin.server.FileDownloader;
import com.vaadin.shared.ui.Connect;
@Connect(FileDownloader.class)
public class FileDownloaderConnector extends AbstractExtensionConnector
implements ClickHandler {
private IFrameElement iframe;
@Override
protected void extend(ServerConnector target) {
final Widget downloadWidget = ((ComponentConnector) target).getWidget();
downloadWidget.addDomHandler(this, ClickEvent.getType());
}
@Override
public void onClick(ClickEvent event) {
final String url = getResourceUrl("dl");
if (url != null && !url.isEmpty()) {
if (iframe != null) {
// make sure it is not on dom tree already, might start
// multiple downloads at once
iframe.removeFromParent();
}
iframe = Document.get().createIFrameElement();
Style style = iframe.getStyle();
style.setVisibility(Visibility.HIDDEN);
style.setHeight(0, Unit.PX);
style.setWidth(0, Unit.PX);
iframe.setFrameBorder(0);
iframe.setTabIndex(-1);
iframe.setSrc(url);
RootPanel.getBodyElement().appendChild(iframe);
}
}
@Override
public void setParent(ServerConnector parent) {
super.setParent(parent);
if (parent == null && iframe != null) {
iframe.removeFromParent();
}
}
}