Dashboard

Dashboard dashboard = new Dashboard();
dashboard.setMinimumColumnWidth("150px");
dashboard.setMaximumColumnCount(3);

DashboardWidget visitors = new DashboardWidget("Visitors");
visitors.setContent(createWidgetContent());
dashboard.add(visitors);

DashboardWidget downloads = new DashboardWidget("Downloads");
downloads.setContent(createWidgetContent());
dashboard.add(downloads);

DashboardWidget conversions = new DashboardWidget("Conversions");
conversions.setContent(createWidgetContent());
dashboard.add(conversions);

DashboardWidget visitorsByCountry = new DashboardWidget(
        "Visitors by country");
visitorsByCountry.setContent(createWidgetContent());
visitorsByCountry.setRowspan(2);
dashboard.add(visitorsByCountry);

DashboardWidget browserDistribution = new DashboardWidget("Browsers");
browserDistribution.setContent(createWidgetContent());
dashboard.add(browserDistribution);

DashboardWidget catImage = new DashboardWidget("A kittykat!");
catImage.setContent(createWidgetContent());
dashboard.add(catImage);

DashboardWidget visitorsByBrowser = new DashboardWidget(
        "Visitors by browser");
visitorsByBrowser.setContent(createWidgetContent());
visitorsByBrowser.setColspan(2);
dashboard.add(visitorsByBrowser);

add(dashboard);

// NOTE: This example uses the additional classes WidgetConfig and
// DashboardStorage, which you can find by switching to the respective file
// tab.

// Since the default DashboardWidget class doesn't allow setting custom
// data, we create a custom class that extends DashboardWidget, and add a
// field for storing the widget type.
public static class CustomWidget extends DashboardWidget {
    private final WidgetConfig.WidgetType type;

    public CustomWidget(WidgetConfig.WidgetType type, String title) {
        super(title);
        this.type = type;
    }

    public WidgetConfig.WidgetType getType() {
        return type;
    }
}

// This is the default configuration for the dashboard. Note that the order
// of the widgets in the list determines the order in which they are
// displayed in the dashboard.
private final List<WidgetConfig> defaultConfig = List.of(
        new WidgetConfig(WidgetConfig.WidgetType.VISITORS, 1, 1),
        new WidgetConfig(WidgetConfig.WidgetType.DOWNLOADS, 1, 1),
        new WidgetConfig(WidgetConfig.WidgetType.CONVERSIONS, 1, 1),
        new WidgetConfig(WidgetConfig.WidgetType.VISITORS_BY_COUNTRY, 1, 2),
        new WidgetConfig(WidgetConfig.WidgetType.BROWSER_DISTRIBUTION, 1,
                1),
        new WidgetConfig(WidgetConfig.WidgetType.CAT_IMAGE, 1, 1),
        new WidgetConfig(WidgetConfig.WidgetType.VISITORS_BY_BROWSER, 2,
                1));

public DashboardEditable(DashboardStorage dashboardStorage) {
    this.dashboardStorage = dashboardStorage;

    createToolbar();
    createDashboard();
}

private void createDashboard() {
    // Create dashboard and load initial configuration
    dashboard = new Dashboard();
    loadConfiguration();

    dashboard.setMinimumColumnWidth("150px");
    dashboard.setMaximumColumnCount(3);
    add(dashboard);
}

private void createToolbar() {
    MenuBar toolbar = new MenuBar();
    toolbar.addThemeVariants(MenuBarVariant.LUMO_DROPDOWN_INDICATORS);

    MenuItem edit = toolbar.addItem("Edit");
    edit.addThemeNames("primary");
    edit.addClickListener(event -> {
        if (dashboard.isEditable()) {
            dashboard.setEditable(false);
            edit.setText("Edit");
        } else {
            dashboard.setEditable(true);
            edit.setText("Apply");
        }
    });

    MenuItem save = toolbar.addItem("Save");
    save.addClickListener(event -> saveConfiguration());

    MenuItem load = toolbar.addItem("Load");
    load.addClickListener(event -> loadConfiguration());

    MenuItem addWidget = toolbar.addItem("Add widget");
    for (WidgetConfig.WidgetType widgetType : WidgetConfig.WidgetType
            .values()) {
        addWidget.getSubMenu().addItem(widgetType.getLabel(),
                event -> addWidget(widgetType));
    }

    MenuItem restore = toolbar.addItem("Restore default");
    restore.addThemeNames("error");
    restore.addClickListener(event -> restoreDefault());

    add(toolbar);
}

private void saveConfiguration() {
    // To save the dashboard configuration, we iterate over the current
    // widgets in the dashboard and map them into configuration objects.
    List<WidgetConfig> dashboardConfig = dashboard.getWidgets().stream()
            .map(widget -> {
                // Cast to our custom widget class and extract type,
                // colspan, and rowspan
                CustomWidget customWidget = (CustomWidget) widget;
                return new WidgetConfig(customWidget.getType(),
                        widget.getColspan(), widget.getRowspan());
            }).toList();

    // Then save the configuration to the database or other storage
    // In this example, we just store it in a session-scoped bean
    dashboardStorage.save(dashboardConfig);
}

private void loadConfiguration() {
    // Load the dashboard configuration from database or other storage
    // In this example, we just load it from a session-scoped bean
    // If no configuration is found, use the default configuration
    List<WidgetConfig> dashboardConfig = dashboardStorage.load();
    if (dashboardConfig == null) {
        dashboardConfig = defaultConfig;
    }

    applyConfiguration(dashboardConfig);
}

private void applyConfiguration(List<WidgetConfig> dashboardConfig) {
    // To apply a dashboard configuration, we first clear the dashboard and
    // then create widgets based on the configuration
    dashboard.removeAll();
    for (WidgetConfig config : dashboardConfig) {
        CustomWidget widget = createWidget(config);
        dashboard.add(widget);
    }
}

private CustomWidget createWidget(WidgetConfig config) {
    // In this example all widget types have the same content, and the title
    // is stored in the enum, so we can use generic logic to create a widget
    CustomWidget widget = new CustomWidget(config.getType(),
            config.getType().getLabel());
    widget.setContent(createWidgetContent());
    widget.setColspan(config.getColspan());
    widget.setRowspan(config.getRowspan());

    // In practice, different widget types will have different content. In
    // that case you can use a switch statement to create the widget content
    // based on the type.
    //
    // switch (config.type()) {
    //     case VISITORS:
    //         widget.setTitle("Visitors");
    //         widget.setContent(new VisitorsWidgetContent());
    //         break;
    //     ...
    // }
    return widget;
}

private void addWidget(WidgetConfig.WidgetType widgetType) {
    // For adding a new widget, we retrieve the default configuration for
    // the widget type and create a widget based on that configuration
    WidgetConfig defaultWidgetConfig = defaultConfig.stream()
            .filter(widgetConfig -> widgetConfig.getType() == widgetType)
            .findFirst().orElseThrow();
    CustomWidget widget = createWidget(defaultWidgetConfig);

    dashboard.add(widget);
}

private void restoreDefault() {
    // To restore defaults, we just apply the default configuration
    applyConfiguration(defaultConfig);
}

DashboardSection statsSection = dashboard
        .addSection("Monthly Funnel Stats");

DashboardWidget visitors = new DashboardWidget("Visitors");
visitors.setContent(createWidgetContent());
statsSection.add(visitors);

DashboardWidget downloads = new DashboardWidget("Downloads");
downloads.setContent(createWidgetContent());
statsSection.add(downloads);

DashboardWidget conversions = new DashboardWidget("Conversions");
conversions.setContent(createWidgetContent());
statsSection.add(conversions);