J2HTML.java

div()
            .withClass("gw-CardViewWidget--tabbar")
            .with(
                    getWidget().getChildren(CardWidget.class).stream().map(card ->
                            div()
                                    .withId(card.getRenderId())
                                    .withClass("gw-CardViewWidget--tab")
                                    .withCondClass(card.isCurrent(), "gw-active")
                                    .withData("gw-click", "fireEvent")
                                    .with(
                                            div().withClass("gw-icon"),
                                            div().withClass("gw-CardViewWidget--tab--inner gw-label")
                                    )
                    ).collect(Collectors.toList()));