UI.Card

UI.Card(input: Input): Node

Creates a themed surface for grouping related content, with consistent padding, border, elevation, inherited colors, and optional motion. It is a layout container rather than a playing-card animation primitive.

Mental model

This is a declarative node: app.render describes it again from current state, while the host matches its stable id to the existing view.

Before you use it

Add luastra/ui to this module's dependencies in luastra.json, then import it with require("luastra/ui"). The project must declare the ui.render capability. app.render must return one UI.Screen root; place this node inside that tree rather than invoking it for a hidden side effect.

How it fits

The constructor validates its fields immediately and returns a UI.Node. After app.render returns, the host reconciles that node by stable id with the current semantic DOM-based interface. Current desktop and mobile hosts package the same web artifact; native adapters are used at capability boundaries.

Shared parameter groups

Parameters

Children and layout

Content of one visual card.

Accessibility and keyboard

A stable id, logical render-tree order, and visible labels preserve predictable keyboard and screen-reader navigation.

Common mistakes

• Using a duplicate id or an uppercase path segment.
• Passing a shared-group parameter that is not listed on this component page.

Returns

Node — a validated declarative UI node that becomes part of the next host-neutral render tree.

What happens next

A validated declarative node appears after it is returned as part of the current render tree.

Failures and fixes

Invalid fields, duplicate IDs, unsupported child combinations, or a missing ui.render capability fail during check, render-tree validation, or host startup.

Availability

Source API in 0.5.0-alpha; the public installer targets 0.5.0-alpha. Verify host-specific behavior against the selected SDK.

Focused example

UI.Card {
    id = "result/card",
    width = "full",
    surface = "elevated",
    padding = "lg",
    gap = "sm",
    UI.Text { id = "result/title", text = "Result", variant = "heading" },
    UI.Text { id = "result/value", text = "42" },
}

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