com.google.gwt.sample.showcase.client.content.i18n.CwPluralFormsExample.java Source code

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Here is the source code for com.google.gwt.sample.showcase.client.content.i18n.CwPluralFormsExample.java

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/*
 * Copyright 2009 Google Inc.
 *
 * 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.sample.showcase.client.content.i18n;

import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.RunAsyncCallback;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyUpEvent;
import com.google.gwt.event.dom.client.KeyUpHandler;
import com.google.gwt.i18n.client.Constants;
import com.google.gwt.sample.showcase.client.ContentWidget;
import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseData;
import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseRaw;
import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseSource;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Anchor;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.FlexTable.FlexCellFormatter;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HasVerticalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.Widget;

/**
 * Example file.
 */
@ShowcaseRaw({ "PluralMessages.java", "PluralMessages_fr.properties" })
public class CwPluralFormsExample extends ContentWidget {
    /**
     * The constants used in this Content Widget.
     */
    @ShowcaseSource
    public static interface CwConstants extends Constants {
        String cwPluralFormsExampleArg0Label();

        String cwPluralFormsExampleDescription();

        String cwPluralFormsExampleFormattedLabel();

        String cwPluralFormsExampleLinkText();

        String cwPluralFormsExampleName();
    }

    /**
     * The {@link TextBox} where the user enters argument 0.
     */
    @ShowcaseData
    private TextBox arg0Box = null;

    /**
     * An instance of the constants.
     */
    @ShowcaseData
    private final CwConstants constants;

    /**
     * The {@link Label} used to display the message.
     */
    @ShowcaseData
    private Label formattedMessage = null;

    /**
     * The plural messages used in this example.
     */
    @ShowcaseData
    private PluralMessages pluralMessages = null;

    /**
     * Constructor.
     *
     * @param constants the constants
     */
    public CwPluralFormsExample(CwConstants constants) {
        super(constants.cwPluralFormsExampleName(), constants.cwPluralFormsExampleDescription(), false,
                "PluralMessages.java", "PluralMessages_fr.properties");
        this.constants = constants;
    }

    /**
     * Initialize this example.
     */
    @ShowcaseSource
    @Override
    public Widget onInitialize() {
        // Create the internationalized error messages
        pluralMessages = GWT.create(PluralMessages.class);

        // Use a FlexTable to layout the content
        FlexTable layout = new FlexTable();
        FlexCellFormatter formatter = layout.getFlexCellFormatter();
        layout.setCellSpacing(5);

        // Add a link to the source code of the Interface
        final String rawFile = getSimpleName(PluralMessages.class);
        Anchor link = new Anchor(rawFile);
        link.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                fireRawSourceRequest(rawFile + ".java");
            }
        });
        HorizontalPanel linkPanel = new HorizontalPanel();
        linkPanel.setSpacing(3);
        linkPanel.add(new HTML(constants.cwPluralFormsExampleLinkText()));
        linkPanel.add(link);
        layout.setWidget(0, 0, linkPanel);
        formatter.setColSpan(0, 0, 2);

        // Add argument 0
        arg0Box = new TextBox();
        arg0Box.setText("13");
        layout.setHTML(2, 0, constants.cwPluralFormsExampleArg0Label());
        layout.setWidget(2, 1, arg0Box);

        // Add the formatted message
        formattedMessage = new Label();
        layout.setHTML(5, 0, constants.cwPluralFormsExampleFormattedLabel());
        layout.setWidget(5, 1, formattedMessage);
        formatter.setVerticalAlignment(5, 0, HasVerticalAlignment.ALIGN_TOP);

        // Add handlers to all of the argument boxes
        KeyUpHandler keyUpHandler = new KeyUpHandler() {
            public void onKeyUp(KeyUpEvent event) {
                updateMessage();
            }
        };
        arg0Box.addKeyUpHandler(keyUpHandler);

        // Return the layout Widget
        updateMessage();
        return layout;
    }

    @Override
    protected void asyncOnInitialize(final AsyncCallback<Widget> callback) {
        GWT.runAsync(CwPluralFormsExample.class, new RunAsyncCallback() {

            public void onFailure(Throwable caught) {
                callback.onFailure(caught);
            }

            public void onSuccess() {
                callback.onSuccess(onInitialize());
            }
        });
    }

    /**
     * Update the formatted message.
     */
    @ShowcaseSource
    private void updateMessage() {
        try {
            int count = Integer.parseInt(arg0Box.getText().trim());
            formattedMessage.setText(pluralMessages.treeCount(count));
        } catch (NumberFormatException e) {
            // Ignore.
        }
    }
}