Example usage for com.google.gwt.core.client.prefetch Prefetcher prefetch

Introduction

In this page you can find the example usage for com.google.gwt.core.client.prefetch Prefetcher prefetch.

Prototype

public static void prefetch(PrefetchableResource resource) 

Source Link

Document

Helper method to call #prefetch(Iterable) with a single resource.

Usage

From source file:com.google.gwt.sample.showcase.client.Showcase.java

License:Apache License

/**
 * This is the entry point method.//from   ww  w .  j a  v a  2s.com
 */
public void onModuleLoad() {
    // Generate the source code and css for the examples
    GWT.create(GeneratorInfo.class);

    // Inject global styles.
    injectThemeStyleSheet();
    images.css().ensureInjected();

    // Initialize the constants.
    ShowcaseConstants constants = GWT.create(ShowcaseConstants.class);

    // Create the application shell.
    final SingleSelectionModel<ContentWidget> selectionModel = new SingleSelectionModel<ContentWidget>();
    final MainMenuTreeViewModel treeModel = new MainMenuTreeViewModel(constants, selectionModel);
    Set<ContentWidget> contentWidgets = treeModel.getAllContentWidgets();
    shell = new ShowcaseShell(treeModel);
    RootLayoutPanel.get().add(shell);

    // Prefetch examples when opening the Category tree nodes.
    final List<Category> prefetched = new ArrayList<Category>();
    final CellTree mainMenu = shell.getMainMenu();
    mainMenu.addOpenHandler(new OpenHandler<TreeNode>() {
        public void onOpen(OpenEvent<TreeNode> event) {
            Object value = event.getTarget().getValue();
            if (!(value instanceof Category)) {
                return;
            }

            Category category = (Category) value;
            if (!prefetched.contains(category)) {
                prefetched.add(category);
                Prefetcher.prefetch(category.getSplitPoints());
            }
        }
    });

    // Always prefetch.
    Prefetcher.start();

    // Change the history token when a main menu item is selected.
    selectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() {
        public void onSelectionChange(SelectionChangeEvent event) {
            ContentWidget selected = selectionModel.getSelectedObject();
            if (selected != null) {
                History.newItem(getContentWidgetToken(selected), true);
            }
        }
    });

    // Setup a history handler to reselect the associate menu item.
    final ValueChangeHandler<String> historyHandler = new ValueChangeHandler<String>() {
        public void onValueChange(ValueChangeEvent<String> event) {
            // Get the content widget associated with the history token.
            ContentWidget contentWidget = treeModel.getContentWidgetForToken(event.getValue());
            if (contentWidget == null) {
                return;
            }

            // Expand the tree node associated with the content.
            Category category = treeModel.getCategoryForContentWidget(contentWidget);
            TreeNode node = mainMenu.getRootTreeNode();
            int childCount = node.getChildCount();
            for (int i = 0; i < childCount; i++) {
                if (node.getChildValue(i) == category) {
                    node.setChildOpen(i, true, true);
                    break;
                }
            }

            // Select the node in the tree.
            selectionModel.setSelected(contentWidget, true);

            // Display the content widget.
            displayContentWidget(contentWidget);
        }
    };
    History.addValueChangeHandler(historyHandler);

    // Show the initial example.
    if (History.getToken().length() > 0) {
        History.fireCurrentHistoryState();
    } else {
        // Use the first token available.
        TreeNode root = mainMenu.getRootTreeNode();
        TreeNode category = root.setChildOpen(0, true);
        ContentWidget content = (ContentWidget) category.getChildValue(0);
        selectionModel.setSelected(content, true);
    }

    // Generate a site map.
    createSiteMap(contentWidgets);
}

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From source file:thothbot.parallax.demo.client.Demo.java

License:Open Source License

public void onModuleLoad() {
    GWT.setUncaughtExceptionHandler(new GWT.UncaughtExceptionHandler() {
        public void onUncaughtException(Throwable throwable) {
            Log.error("Uncaught exception", throwable);
            if (!GWT.isScript()) {
                String text = "Uncaught exception: ";
                while (throwable != null) {
                    StackTraceElement[] stackTraceElements = throwable.getStackTrace();
                    text += throwable.toString() + "\n";

                    for (int i = 0; i < stackTraceElements.length; i++)
                        text += "    at " + stackTraceElements[i] + "\n";

                    throwable = throwable.getCause();
                    if (throwable != null)
                        text += "Caused by: ";
                }//from  w  w w.  j ava 2 s  .  c o m

                DialogBox dialogBox = new DialogBox(true);
                DOM.setStyleAttribute(dialogBox.getElement(), "backgroundColor", "#ABCDEF");
                text = text.replaceAll(" ", "&nbsp;");
                dialogBox.setHTML("<pre>" + text + "</pre>");
                dialogBox.center();
            }
        }
    });

    // Generate the source code for examples
    GWT.create(GenerateSourceSignal.class);

    // Generate the demo file
    GWT.create(GenerateFacebookSignal.class);

    resources.css().ensureInjected();

    // Create the application shell.
    final SingleSelectionModel<ContentWidget> selectionModel = new SingleSelectionModel<ContentWidget>();
    final DataModel treeModel = new DataModel(selectionModel);
    Set<ContentWidget> contentWidgets = treeModel.getAllContentWidgets();

    index = new Index();
    // Hide loading panel
    RootPanel.get("loading").getElement().getStyle().setVisibility(Visibility.HIDDEN);
    // Attach index panel
    RootLayoutPanel.get().add(index);

    index.getTabIndex().addClickHandler(new ClickHandler() {
        public void onClick(ClickEvent event) {
            displayIndex();
        }
    });

    indexWidget = new IndexWidget(treeModel);
    shell = new DemoShell(treeModel, index);

    // Prefetch examples when opening the Category tree nodes.
    final List<Category> prefetched = new ArrayList<Category>();
    final CellTree mainMenu = shell.getMainMenu();

    mainMenu.addOpenHandler(new OpenHandler<TreeNode>() {
        public void onOpen(OpenEvent<TreeNode> event) {
            Object value = event.getTarget().getValue();
            if (!(value instanceof Category))
                return;

            Category category = (Category) value;
            if (!prefetched.contains(category)) {
                prefetched.add(category);
                Prefetcher.prefetch(category.getSplitPoints());
            }
        }
    });

    // Always prefetch.
    Prefetcher.start();

    // Change the history token when a main menu item is selected.
    selectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() {
        public void onSelectionChange(SelectionChangeEvent event) {
            ContentWidget selected = selectionModel.getSelectedObject();
            if (selected != null) {
                index.setContentWidget(shell);
                History.newItem("!" + selected.getContentWidgetToken(), true);
            }
        }
    });

    // Setup a history handler to reselect the associate menu item.
    final ValueChangeHandler<String> historyHandler = new ValueChangeHandler<String>() {
        public void onValueChange(ValueChangeEvent<String> event) {
            // Get the content widget associated with the history token.
            ContentWidget contentWidget = treeModel
                    .getContentWidgetForToken(event.getValue().replaceFirst("!", ""));

            if (contentWidget == null)
                return;

            // Expand the tree node associated with the content.
            Category category = treeModel.getCategoryForContentWidget(contentWidget);
            TreeNode node = mainMenu.getRootTreeNode();
            int childCount = node.getChildCount();
            for (int i = 0; i < childCount; i++) {
                if (node.getChildValue(i) == category) {
                    node.setChildOpen(i, true, true);
                    break;
                }
            }

            // Display the content widget.
            displayContentWidget(contentWidget);

            //Add GA statistics
            trackPageview(Window.Location.getHref());

            // Select the node in the tree.
            selectionModel.setSelected(contentWidget, true);
        }
    };

    History.addValueChangeHandler(historyHandler);

    // Show the initial example.
    if (History.getToken().length() > 0)
        History.fireCurrentHistoryState();

    // Use the first token available.
    else
        displayIndex();

    // Generate a site map.
    createSiteMap(contentWidgets);
}

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