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

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

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/*
 * Copyright 2008 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.HorizontalPanel;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.Widget;

import java.util.MissingResourceException;

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

        String cwConstantsWithLookupExampleLinkText();

        String cwConstantsWithLookupExampleMethodName();

        String cwConstantsWithLookupExampleName();

        String cwConstantsWithLookupExampleNoInput();

        String cwConstantsWithLookupExampleNoMatches();

        String cwConstantsWithLookupExampleResults();
    }

    /**
     * A {@link TextBox} where the user can select a color to lookup.
     */
    @ShowcaseData
    private TextBox colorBox = null;

    /**
     * The {@link ColorConstants} that map colors to values.
     */
    private ColorConstants colorConstants = null;

    /**
     * A {@link TextBox} where the results of the lookup are displayed.
     */
    @ShowcaseData
    private TextBox colorResultsBox = null;

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

    /**
     * Constructor.
     *
     * @param constants the constants
     */
    public CwConstantsWithLookupExample(CwConstants constants) {
        super(constants.cwConstantsWithLookupExampleName(), constants.cwConstantsWithLookupExampleDescription(),
                false, "ColorConstants.java", "ColorConstants.properties");
        this.constants = constants;
    }

    /**
     * Initialize this example.
     */
    @ShowcaseSource
    @Override
    public Widget onInitialize() {
        // Create the internationalized constants
        colorConstants = GWT.create(ColorConstants.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(ColorConstants.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.cwConstantsWithLookupExampleLinkText()));
        linkPanel.add(link);
        layout.setWidget(0, 0, linkPanel);
        formatter.setColSpan(0, 0, 2);

        // Add a field so the user can type a color
        colorBox = new TextBox();
        colorBox.setText("red");
        colorBox.setWidth("17em");
        layout.setHTML(1, 0, constants.cwConstantsWithLookupExampleMethodName());
        layout.setWidget(1, 1, colorBox);

        // Show the last name
        colorResultsBox = new TextBox();
        colorResultsBox.setEnabled(false);
        colorResultsBox.setWidth("17em");
        layout.setHTML(2, 0, constants.cwConstantsWithLookupExampleResults());
        layout.setWidget(2, 1, colorResultsBox);

        // Add a handler to update the color as the user types a lookup value
        colorBox.addKeyUpHandler(new KeyUpHandler() {
            public void onKeyUp(KeyUpEvent event) {
                updateColor();
            }
        });

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

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

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

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

    /**
     * Lookup the color based on the value the user entered.
     */
    @ShowcaseSource
    private void updateColor() {
        String key = colorBox.getText().trim();
        if (key.equals("")) {
            colorResultsBox.setText(constants.cwConstantsWithLookupExampleNoInput());
        } else {
            try {
                String color = colorConstants.getString(key);
                colorResultsBox.setText(color);
            } catch (MissingResourceException e) {
                colorResultsBox.setText(constants.cwConstantsWithLookupExampleNoMatches());
            }
        }
    }
}