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

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Here is the source code for com.google.gwt.gwtai.demo.client.CounterAppletTab.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.user.client.ui.Button;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.DialogBox;
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;
import com.google.gwt.gwtai.applet.client.AppletJSUtil;

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

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

        Button buttonInc = new Button("Increment");
        Button buttonDec = new Button("Decrement");
        Button buttonGet = new Button("Get current count");

        final CounterApplet counterApplet = (CounterApplet) GWT.create(CounterApplet.class);

        buttonInc.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                counterApplet.increment();
            }
        });

        buttonDec.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                counterApplet.decrement();
            }
        });

        buttonGet.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                Object value = counterApplet.getCurrentValue();

                DialogBox dialogBox = createDialogBox(value);
                dialogBox.center();
                dialogBox.show();
            }
        });

        HorizontalPanel buttonPanel = new HorizontalPanel();
        buttonPanel.setSpacing(4);
        buttonPanel.add(buttonInc);
        buttonPanel.add(buttonDec);
        buttonPanel.add(buttonGet);

        Widget widgetApplet = AppletJSUtil.createAppletWidget(counterApplet);
        Label labelTitle = new Label(
                "To call a method on an applet object from within your GWT code - a piece of cake!");
        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(panelCode);

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

        initWidget(panelMain);
    }

    private DialogBox createDialogBox(Object currentValue) {
        final DialogBox dialogBox = new DialogBox();
        dialogBox.setText("Current...");

        VerticalPanel panelContent = new VerticalPanel();
        panelContent.setWidth("100%");
        panelContent.setSpacing(4);
        dialogBox.setWidget(panelContent);

        HTML labelCurrentValue = new HTML("The current count is : " + currentValue);
        panelContent.add(labelCurrentValue);
        panelContent.setCellHorizontalAlignment(labelCurrentValue, VerticalPanel.ALIGN_CENTER);

        Button buttonCloseDlg = new Button("Close");
        buttonCloseDlg.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                dialogBox.hide();
            }
        });

        panelContent.add(buttonCloseDlg);
        panelContent.setCellHorizontalAlignment(buttonCloseDlg, VerticalPanel.ALIGN_RIGHT);

        return dialogBox;
    }

    /**
     * Helper-Method to construct an HTML element containing some example code snippets.
     */
    private HTML createCodeHTML() {
        String html = "<b>CounterAppletTab.java</b>" + "<pre>...\n"
                + "VerticalPanel panelMain = new VerticalPanel();\n"
                + "Button buttonInc = new Button(\"Increment\");\n"
                + "final CounterApplet counterApplet = (CounterApplet) GWT.create(CounterApplet.class);\n\n"
                + "buttonInc.addClickListener(new ClickListener() {\n" + "   public void onClick(Widget sender) {\n"
                + "      counterApplet.increment();\n" + "   }\n" + "});\n\n"
                + "Widget widgetApplet = AppletJSUtil.createAppletWidget(counterApplet);\n"
                + "panelMain.add(widgetApplet);\n\n" + "initWidget(panelMain);\n" + "...</pre>";

        return new HTML(html);
    }

}