com.google.gwt.gwtai.demo.client.StopWatchAppletTab.java Source code

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Here is the source code for com.google.gwt.gwtai.demo.client.StopWatchAppletTab.java

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/*
 * Copyright 2008 Adrian Buerki
 * 
 * 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.google.gwt.gwtai.demo.client;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.gwtai.applet.client.AppletJSUtil;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.DisclosurePanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * The content of the <code>StopWatchApplet</code> demo tab.
 * 
 * @author Adrian Buerki <a.buerki@gmail.com>
 */
public class StopWatchAppletTab extends Composite {

    public StopWatchAppletTab() {
        VerticalPanel panelMain = new VerticalPanel();
        panelMain.setWidth("100%");
        panelMain.setSpacing(4);

        VerticalPanel panelLaps = new VerticalPanel();
        panelLaps.setWidth("100%");
        panelLaps.setSpacing(4);

        Button buttonStart = new Button("Start");
        Button buttonStop = new Button("Stop");

        final StopWatchApplet stopWatchApplet = (StopWatchApplet) GWT.create(StopWatchApplet.class);

        buttonStart.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                stopWatchApplet.startWatch();
            }
        });

        buttonStop.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                stopWatchApplet.stopWatch();
            }
        });

        HorizontalPanel buttonPanel = new HorizontalPanel();
        buttonPanel.setSpacing(4);
        buttonPanel.add(buttonStart);
        buttonPanel.add(buttonStop);

        Widget widgetApplet = AppletJSUtil.createAppletWidget(stopWatchApplet);
        AppletJSUtil.registerAppletCallback(stopWatchApplet, new StopWatchCallback(panelLaps));

        Label labelTitle = new Label(
                "Register a callback object to notify GWT of changes from within the Applet code.");
        DisclosurePanel panelCode = new DisclosurePanel("View code");
        panelCode.setWidth("100%");
        panelCode.setAnimationEnabled(true);
        panelCode.setContent(createCodeHTML());

        panelMain.add(labelTitle);
        panelMain.add(widgetApplet);
        panelMain.add(buttonPanel);
        panelMain.add(panelLaps);
        panelMain.add(panelCode);

        panelMain.setCellHorizontalAlignment(labelTitle, VerticalPanel.ALIGN_CENTER);
        panelMain.setCellHorizontalAlignment(widgetApplet, VerticalPanel.ALIGN_CENTER);
        panelMain.setCellHorizontalAlignment(panelLaps, VerticalPanel.ALIGN_CENTER);
        panelMain.setCellHorizontalAlignment(buttonPanel, VerticalPanel.ALIGN_CENTER);

        initWidget(panelMain);
    }

    /**
     * Helper-Method to construct an HTML element containing some example code
     * snippets.
     */
    private HTML createCodeHTML() {
        String html = "<b>StopWatchAppletTab.java</b>" + "<pre>...\n"
                + "StopWatchApplet stopWatchApplet = (StopWatchApplet) GWT.create(StopWatchApplet.class);\n"
                + "Widget widgetApplet = AppletJSUtil.createAppletWidget(stopWatchApplet);\n"
                + "AppletJSUtil.registerAppletCallback(stopWatchApplet, new StopWatchCallback(panelLaps));\n"
                + "...</pre>\n" + "<b>StopWatchCallback.java</b>" + "<pre>...\n"
                + "public class StopWatchCallback implements AppletCallback&lt;String&gt; {\n"
                + "  private VerticalPanel _panelLaps;\n" + "  private int _lap;\n\n"
                + "  public StopWatchCallback(VerticalPanel panelLaps) {\n" + "    _panelLaps = panelLaps;\n"
                + "    _lap = 1;\n" + "  }\n\n" + "  public void callback(String msg) {\n"
                + "    _panelLaps.add(new HTML(\"&lt;b&gt;Lap \" + _lap + \"&lt;/b&gt; : \" + msg + \" seconds\"));\n"
                + "    _lap++;\n" + "  }\n" + "}</pre>" + "<b>StopWatchAppletImpl.java</b>" + "<pre>...\n"
                + "public class StopWatchAppletImpl extends JApplet implements StopWatchApplet {\n" + "  ...\n"
                + "  public void init() {\n" + "    ...\n" + "    JButton buttonLap = new JButton(\"Lap\");\n"
                + "    buttonLap.addActionListener(new ActionListener() {\n\n"
                + "      public void actionPerformed(ActionEvent e) {\n" + "        startWatch();\n"
                + "        AppletUtil.callback(StopWatchAppletImpl.this, _swLabel.getText());\n" + "      }\n"
                + "    });\n" + "    ...\n" + "  }\n" + "}</pre>";

        return new HTML(html);
    }

}