write-composable

Development

Use when creating a new Composable or modifying an existing one in the Alkaa project — screen structure, state handling, adaptive layouts, Kuvio usage, or previews.

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Write Composable

Overview

Composables in Alkaa follow a strict three-layer Screen → Loader → Content pattern. All UI uses Kuvio components exclusively, state flows from ViewModel through the Loader, and every composable requires both dark and light previews.

Screen Structure

Every screen has three layers: <Feature>Screen (public, stateless, NavGraph entry point) → <Feature>Loader (internal, injects ViewModel, collects state) → <Feature>Content (internal, stateless, tested with Compose Testing).

→ See references/SCREEN_PATTERNS.md for Kotlin code examples of each layer.

For screens with list→detail relationships, a two-pane adaptive layout is required on wide windows (tablets, desktop). The isSinglePane boolean originates at the NavGraph entry and flows unchanged to the Loader where branching happens.

→ See references/ADAPTIVE_LAYOUTS.md for isSinglePane flow, Loader branching pattern, ListDetailPaneScaffold, and toolbar adaptation.

Rules

Rule	Details
Kuvio only	Use `KuvioText`, `KuvioIcon`, etc. — never raw `Text`, `Icon`, or Material components
Modifier param	Every rendering composable accepts `modifier: Modifier = Modifier`
Paddings	Always even numbers, multiples of 4 (4, 8, 12, 16, 24 dp)
Snackbar	Use Snackbar, never Toast
Adaptive	Screens must work on landscape, tablets, and desktop
Previews	All composables need both dark and light previews
isSinglePane origin	Always computed at NavGraph entry via `currentWindowAdaptiveInfo().windowSizeClass.isSinglePane()`

Red Flags

Stop if you notice:

koinInject() or get() called outside of a Loader
Text(text = ..., style = ...) anywhere in the code
No Modifier parameter on a rendering composable
A single preview without dark/light variants
Odd padding or padding not a multiple of 4
A needed Kuvio component doesn't exist → implement with write-design-system-component first

Common Mistakes

Mistake	Fix
Injecting ViewModel outside a Loader	Move all `koinViewModel()` / `koinInject()` calls to `<Feature>Loader`
Using raw `Text(style = ...)`	Use the appropriate `Kuvio*Text` variant instead
Mapping or transforming data inside a composable	Push logic to the ViewModel; composables only render
Missing `Modifier` parameter on a rendering composable	Add `modifier: Modifier = Modifier` to every rendering function
Single preview without dark/light variants	Always provide both light and dark `@Preview`
Non-multiple-of-4 padding	Use multiples of 4 (4, 8, 12, 16, 24 dp)
Computing `isSinglePane` inside a composable	Always compute at NavGraph entry, never inside the screen
Passing `isSinglePane = true` to detail pane in `ListDetailPaneScaffold`	Side-panel detail always receives `false`
Calling `navigator.navigateTo()` without `coroutineScope.launch`	`navigateTo` is a suspend function — wrap in `coroutineScope.launch`

Related Skills

Missing Kuvio component → use write-design-system-component skill before implementing the composable
User-facing strings → use localization skill
Testing composable behavior → use write-ui-tests skill