io.graphenee.vaadin.ResourcePreviewPanel Maven / Gradle / Ivy

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/*******************************************************************************
 * Copyright (c) 2016, 2018 Farrukh Ijaz
 *
 * 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 io.graphenee.vaadin;

import com.vaadin.server.ErrorHandler;
import com.vaadin.server.FileDownloader;
import com.vaadin.server.Page;
import com.vaadin.server.Resource;
import com.vaadin.ui.BrowserFrame;
import com.vaadin.ui.Notification.Type;
import com.vaadin.ui.UI;
import com.vaadin.ui.themes.ValoTheme;

import org.vaadin.viritin.button.MButton;
import org.vaadin.viritin.layouts.MHorizontalLayout;
import org.vaadin.viritin.layouts.MVerticalLayout;

import io.graphenee.vaadin.ui.GxNotification;
import io.graphenee.vaadin.util.VaadinUtils;

@SuppressWarnings("serial")
public class ResourcePreviewPanel extends TRAbstractPanel {

	private BrowserFrame viewer;
	private MButton downloadButton;

	@Override
	protected boolean isSpringComponent() {
		return false;
	}

	@Override
	protected void addButtonsToFooter(MHorizontalLayout layout) {
		downloadButton = new MButton("Download").withStyleName(ValoTheme.BUTTON_PRIMARY).withVisible(true);
		layout.addComponentAsFirst(downloadButton);
		layout.setExpandRatio(downloadButton, 1);
		layout.setWidth("100%");
	}

	@Override
	protected String panelTitle() {
		return "Preview";
	}

	@Override
	protected void addComponentsToContentLayout(MVerticalLayout layout) {
		viewer = new BrowserFrame(null);
		viewer.setResponsive(true);
		viewer.setSizeFull();
		layout.add(viewer);
		layout.setExpandRatio(viewer, 1);
	}

	@Override
	protected String popupHeight() {
		return Math.round(VaadinUtils.browserHeight() * 0.9) + "px";
	}

	@Override
	protected String popupWidth() {
		return Math.round(VaadinUtils.browserWidth() * 0.9) + "px";
	}

	public void preview(Resource resource) {
		build();
		viewer.setSource(resource);
		FileDownloader downloader = new FileDownloader(resource);
		downloader.setErrorHandler(new ErrorHandler() {

			@Override
			public void error(com.vaadin.server.ErrorEvent event) {
				event.getThrowable().printStackTrace();
				UI.getCurrent().access(() -> {
					GxNotification.closable(
							"Download the file again and wait until the download is finished before you open the file.",
							Type.ERROR_MESSAGE).show(Page.getCurrent());
					UI.getCurrent().push();
				});
			}
		});
		downloader.extend(downloadButton);
		openInModalPopup();
	}

	public void download(Resource resource) {
		preview(resource);
	}

}