Example usage for com.google.gwt.user.client HistoryListener HistoryListener

Introduction

In this page you can find the example usage for com.google.gwt.user.client HistoryListener HistoryListener.

Prototype

HistoryListener

Source Link

Usage

From source file:com.google.gwt.sample.feedreader.client.GwtFeedReader.java

License:Apache License

/**
 * Initialize the global state of the application.
 *///from  w  w  w.j av  a 2s.c  o m
private void initialize() {
    // This function should only work once.
    if (configuration != null) {
        return;
    }

    configuration = new Configuration();

    // Create the root UI element
    manifest = new ManifestPanel(configuration);

    // Use a WindowCloseListener to save the configuration
    Window.addWindowCloseListener(new WindowCloseListener() {

        public void onWindowClosed() {
            configuration.save();
        }

        public String onWindowClosing() {
            // TODO have a configuration value to warn before closing.
            return null;
        }
    });

    // Start a timer to automatically save the configuration in case of sudden
    // exit.
    (new Timer() {
        public void run() {
            configuration.save();
        }
    }).scheduleRepeating(1000 * 60 * 5);

    // Add a HistoryListener to control the application.
    History.addHistoryListener(new HistoryListener() {
        /**
         * Prevent repeated loads of the same token.
         */
        String lastToken = "";

        public void onHistoryChanged(String token) {
            if (lastToken.equals(token)) {
                return;
            }

            if (token != null) {
                lastToken = token;
                processHistoryToken(token);
            }
        }
    });

    // The stylesheet are factored into two pieces: a common template
    // that defines sizes and structural elements.
    StyleInjector.injectStylesheet(Resources.INSTANCE.layoutCss().getText());
    // And further CSS rules that provide look-and-feel and localized resources
    StyleInjector.injectStylesheet(Resources.INSTANCE.appearanceCss().getText(), Resources.INSTANCE);

    UnsunkLabel logo = new UnsunkLabel();
    logo.addStyleName("logo");
    RootPanel.get().add(logo, 0, 0);
}

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