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/*
* Copyright 2011 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.tests;
import java.io.File;
import com.vaadin.Application;
import com.vaadin.data.util.FilesystemContainer;
import com.vaadin.data.util.FilesystemContainer.FileItem;
import com.vaadin.tests.util.SampleDirectory;
import com.vaadin.ui.Component.Event;
import com.vaadin.ui.Component.Listener;
import com.vaadin.ui.Field;
import com.vaadin.ui.Label;
import com.vaadin.ui.Panel;
import com.vaadin.ui.Tree;
import com.vaadin.ui.UI.LegacyWindow;
import com.vaadin.ui.VerticalLayout;
/**
* Browsable file explorer using Vaadin Tree component. Demonstrates: how to use
* <code>com.vaadin.ui.Component.Tree</code> datasource container, how to create
* <code>com.vaadin.data.util.FilesystemContainer</code>, how to read
* <code>com.vaadin.ui.Component.Event</code> objects, how to receive and handle
* any event by implementing <code>com.vaadin.ui.Component.Listener</code>.
*
* @since 4.0.0
*
*/
public class TreeFilesystemContainer extends
com.vaadin.Application.LegacyApplication implements Listener {
// Filesystem explorer panel and it's components
private final Panel explorerPanel = new Panel("Filesystem explorer");
private final Tree filesystem = new Tree();
// File properties panel and it's components
private final Panel propertyPanel = new Panel("File properties");
private final Label fileProperties = new Label();
@Override
public void init() {
final LegacyWindow w = new LegacyWindow("Tree FilesystemContainer demo");
setMainWindow(w);
final VerticalLayout main = new VerticalLayout();
w.setContent(main);
main.setMargin(true);
main.setSpacing(true);
propertyPanel.setHeight("120px");
main.addComponent(propertyPanel);
explorerPanel.setHeight("100%");
main.addComponent(explorerPanel);
main.setExpandRatio(explorerPanel, 1);
// Explorer panel contains tree
explorerPanel.addComponent(filesystem);
// Property panel contains label
propertyPanel.addComponent(fileProperties);
fileProperties.setCaption("No file selected.");
propertyPanel.setEnabled(false);
// Get sample directory
final File sampleDir = SampleDirectory.getDirectory(
Application.getCurrent(), w);
// Populate tree with FilesystemContainer
final FilesystemContainer fsc = new FilesystemContainer(sampleDir, true);
filesystem.setContainerDataSource(fsc);
// "this" handles all filesystem events
// e.g. node clicked, expanded etc.
filesystem.addListener(this);
// Value changes are immediate
filesystem.setImmediate(true);
}
/**
* Listener for any component events. This class has been registered as an
* listener for component fsTree.
*/
@Override
public void componentEvent(Event event) {
// Check if event occured at fsTree component
if (event.getSource() == filesystem) {
// Check if event is about changing value
if (event.getClass() == Field.ValueChangeEvent.class) {
// Update property panel contents
final FileItem fileItem = (FileItem) filesystem
.getItem(filesystem.getValue());
fileProperties.setIcon(fileItem.getIcon());
fileProperties.setCaption(fileItem.getName() + ", size "
+ fileItem.getSize() + " bytes.");
propertyPanel.setEnabled(true);
}
// here we could check for other type of events for filesystem
// component
}
// here we could check for other component's events
}
}
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