Example usage for com.google.gwt.user.cellview.client CellTree addOpenHandler

Introduction

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

Prototype

public HandlerRegistration addOpenHandler(OpenHandler<TreeNode> handler) 

Source Link

Usage

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

License:Apache License

/**
 * This is the entry point method.//w  w w. jav  a  2 s  .  co m
 */
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: ";
                }/*w w w .  j av a  2 s.  co 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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