Class ExpandingTouchNavRenderer

java.lang.Object

org.vaadin.addons.joelpop.appnavlayout.ui.layout.appnav.ExpandingTouchNavRenderer

All Implemented Interfaces:

NavRenderer

@CssImport("./expanding-touch-nav.css")
public class ExpandingTouchNavRenderer
extends Object
implements NavRenderer

An alternative NavRenderer for NavType.TOUCH — a grid of root sections in NavSlots.touchBar() that expands upward via a chevron when there are more than fit, instead of the default "More" popover. The primary row always shows a fixed, even number of items; the rest sit in a collapsible overflow section beneath it. Also drives the shared SecondaryTabBar drill-down bar, the same as every other built-in touch/rail renderer.

Constructor Summary

Constructors

Constructor	Description
ExpandingTouchNavRenderer()

Method Summary

Modifier and Type	Method	Description
NavType	navType()	The chrome this renderer requires — determines which NavStrategy gets built for whichever scenario this renderer is configured for.
void	render(NavRenderContext context)	Builds or updates this renderer's content for the current nav state.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface NavRenderer

railWidth

Constructor Details

ExpandingTouchNavRenderer

public ExpandingTouchNavRenderer()

Method Details

navType

public NavType navType()

Description copied from interface: NavRenderer

The chrome this renderer requires — determines which NavStrategy gets built for whichever scenario this renderer is configured for. Not a free choice: a renderer's NavRenderer.render(NavRenderContext) implementation already assumes one specific NavSlots accessor is live (e.g. SideRailNavRenderer only ever populates NavSlots.sideRail()), and that slot is only live under the matching NavType's strategy. This method makes that assumption explicit instead of leaving it to silently mismatch — a renderer configured for a scenario whose resolved chrome doesn't match its own navType() would otherwise render into a slot that's never attached to the page, with nothing to indicate why.

Specified by:

navType in interface NavRenderer

render

public void render(NavRenderContext context)

Description copied from interface: NavRenderer

Builds or updates this renderer's content for the current nav state. Called once when this scenario becomes active, again on every completed navigation, and again whenever nav configuration changes (grouper swap, path matcher change). The implementation decides which slot(s) in context.slots() to populate and how — including any overflow or drill-down scaffolding it needs (a "More…" popover, a chevron, a swipeable container, etc).

Specified by:

render in interface NavRenderer