com.google.gwt.sample.stockwatcher.client.BrowserHistoryExample.java Source code

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Here is the source code for com.google.gwt.sample.stockwatcher.client.BrowserHistoryExample.java

Source

package com.google.gwt.sample.stockwatcher.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TabPanel;

/**
 * Entry point classes define <code>onModuleLoad()</code>.
 */
public class BrowserHistoryExample implements EntryPoint {

    TabPanel tabPanel;

    /**
     * This is the entry point method.
     */
    public void onModuleLoad() {
        tabPanel = new TabPanel();

        tabPanel.add(new HTML("<h1>Page 0 Content: Llamas</h1>"), " Page 0 ");
        tabPanel.add(new HTML("<h1>Page 1 Content: Alpacas</h1>"), " Page 1 ");
        tabPanel.add(new HTML("<h1>Page 2 Content: Camels</h1>"), " Page 2 ");

        tabPanel.addSelectionHandler(new SelectionHandler<Integer>() {
            public void onSelection(SelectionEvent<Integer> event) {
                History.newItem("page" + event.getSelectedItem());
            }
        });

        History.addValueChangeHandler(new ValueChangeHandler<String>() {
            public void onValueChange(ValueChangeEvent<String> event) {
                String historyToken = event.getValue();

                // Parse the history token
                try {
                    if (historyToken.substring(0, 4).equals("page")) {
                        String tabIndexToken = historyToken.substring(4, 5);
                        int tabIndex = Integer.parseInt(tabIndexToken);
                        // Select the specified tab panel
                        tabPanel.selectTab(tabIndex);
                    } else {
                        tabPanel.selectTab(0);
                    }

                } catch (IndexOutOfBoundsException e) {
                    tabPanel.selectTab(0);
                }
            }
        });

        tabPanel.selectTab(0);
        RootPanel.get().add(tabPanel);
    }
}