com.goodow.web.ui.client.search.DefaultHeader.java Source code

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Here is the source code for com.goodow.web.ui.client.search.DefaultHeader.java

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/*
 * Copyright 2012 Goodow.com
 * 
 * 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.goodow.web.ui.client.search;

import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Style.Display;
import com.google.gwt.dom.client.TableCellElement;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.http.client.UrlBuilder;
import com.google.gwt.i18n.client.LocaleInfo;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.Cookies;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.Window.Location;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.Widget;
import com.google.inject.Singleton;

import java.util.Date;

@Singleton
public class DefaultHeader extends Composite implements Header {

    interface DefaultHeaderUiBinder extends UiBinder<Widget, DefaultHeader> {
    }

    private static DefaultHeaderUiBinder uiBinder = GWT.create(DefaultHeaderUiBinder.class);

    @UiField
    HTMLPanel titleBar;
    /**
     * A drop box used to change the locale.
     */
    @UiField
    ListBox localeBox;
    /**
     * The container around locale selection.
     */
    @UiField
    TableCellElement localeSelectionCell;

    public DefaultHeader() {
        initWidget(uiBinder.createAndBindUi(this));
        initializeLocaleBox();
    }

    /**
     * Initialize the {@link ListBox} used for locale selection.
     */
    private void initializeLocaleBox() {
        final String cookieName = LocaleInfo.getLocaleCookieName();
        final String queryParam = LocaleInfo.getLocaleQueryParam();
        if (cookieName == null && queryParam == null) {
            // if there is no way for us to affect the locale, don't show the selector
            localeSelectionCell.getStyle().setDisplay(Display.NONE);
            return;
        }
        String currentLocale = LocaleInfo.getCurrentLocale().getLocaleName();
        if (currentLocale.equals("default")) {
            currentLocale = "zh";
        }
        String[] localeNames = LocaleInfo.getAvailableLocaleNames();
        for (String localeName : localeNames) {
            if (!localeName.equals("default")) {
                String nativeName = LocaleInfo.getLocaleNativeDisplayName(localeName);
                localeBox.addItem(nativeName, localeName);
                if (localeName.equals(currentLocale)) {
                    localeBox.setSelectedIndex(localeBox.getItemCount() - 1);
                }
            }
        }
        localeBox.addChangeHandler(new ChangeHandler() {
            @Override
            @SuppressWarnings("deprecation")
            public void onChange(final ChangeEvent event) {
                String localeName = localeBox.getValue(localeBox.getSelectedIndex());
                if (cookieName != null) {
                    // expire in one year
                    Date expires = new Date();
                    expires.setYear(expires.getYear() + 1);
                    Cookies.setCookie(cookieName, localeName, expires);
                }
                if (queryParam != null) {
                    UrlBuilder builder = Location.createUrlBuilder().setParameter(queryParam, localeName);
                    Window.Location.replace(builder.buildString());
                } else {
                    // If we are using only cookies, just reload
                    Window.Location.reload();
                }
            }
        });
    }
}