org.wicketstuff.progressbar.examples.SimpleProgressExamplePage.java Source code

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Here is the source code for org.wicketstuff.progressbar.examples.SimpleProgressExamplePage.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.wicketstuff.progressbar.examples;

import org.apache.wicket.Component;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.extensions.ajax.markup.html.IndicatingAjaxButton;
import org.apache.wicket.markup.html.form.Form;
import org.wicketstuff.progressbar.ProgressBar;
import org.wicketstuff.progressbar.Progression;
import org.wicketstuff.progressbar.ProgressionModel;

/**
 * <p>
 * Simple example of an active progress bar without using a dedicated Spring task service.
 * </p>
 * 
 * <p>
 * The progress is stored directly in the page and the task is started in a new thread (this is not
 * suited for production!).
 * </p>
 * 
 * @author Christopher Hlubek (hlubek)
 * 
 */
public class SimpleProgressExamplePage extends PageSupport {

    private static final long serialVersionUID = 1L;

    /**
     * The current progress is stored here
     */
    int progress = 0;

    int item = 0;

    public SimpleProgressExamplePage() {
        final Form<Void> form = new Form<Void>("form");
        final ProgressBar bar;
        form.add(bar = new ProgressBar("bar", new ProgressionModel() {
            private static final long serialVersionUID = 1L;

            // Get current progress from page field
            @Override
            protected Progression getProgression() {
                return new Progression(progress, "Item " + item);
            }
        }) {
            private static final long serialVersionUID = 1L;

            @Override
            protected void onFinished(AjaxRequestTarget target) {
                // Hide progress bar after finish
                setVisible(false);
                // Add some JavaScript after finish
                target.appendJavaScript("alert('Task done!')");

                // re-enable button
                Component button = form.get("submit");
                button.setEnabled(true);
                target.add(button);
            }
        });
        // Hide progress bar initially
        bar.setVisible(false);

        form.add(new IndicatingAjaxButton("submit", form) {
            private static final long serialVersionUID = 1L;

            @Override
            protected void onSubmit(AjaxRequestTarget target, Form<?> form) {
                // Start the progress bar, will set visibility to true
                bar.start(target);
                // Thread holds reference to page :(
                new Thread() {
                    @Override
                    public void run() {
                        for (int i = 0; i <= 50; i++) {
                            try {
                                Thread.sleep(400);
                            } catch (InterruptedException e) {
                            }
                            item = i;
                            progress = i * 2;
                        }
                        // The bar is stopped automatically, if progress is done
                    }
                }.start();

                // disable button
                setEnabled(false);
            }

            @Override
            protected void onError(AjaxRequestTarget target, Form<?> form) {

                target.prependJavaScript("alert('Failed to update progress');");
            }

        });
        form.setOutputMarkupId(true);
        add(form);
    }
}