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mobile-ui-scaling

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更新日2026年7月23日 10:56

How to correctly make UI scale on mobile in this project. The app scales every UI screen with the external ScalableContainer (@vibegameengine/ui-scaler): content is authored in a fixed logical `targetWidth` and shrunk by `transform: scale(min(1, innerWidth/targetWidth))`. On a phone a desktop-width target collapses the UI to ~30% (tiny, unreadable). The ONE correct fix is a DYNAMIC targetWidth per device via the shared `useResponsiveTargetWidth` hook — never remove the scaler, never patch it with per-element `transform: scale(N)` compensation, never invent a new scaling system. MANDATORY whenever a screen is "too small / doesn't scale / broken on mobile", when touching `targetWidth`, ScalableContainer, a HUD/menu/overlay on mobile, or any responsive UI work. Trigger on: "mobile UI", "doesn't scale on phone", "too small on mobile", "targetWidth", "ScalableContainer", "adaptive UI", "responsive", "portrait", "HUD too big/small on mobile", "меню не скейлится", "плашка на мобилке".

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vibegameengine/web-starter-kit

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Mobile UI scaling — dynamic targetWidth, verified by eye

The system (do NOT replace it)

Every UI screen is wrapped in ScalableContainer from @vibegameengine/ui-scaler. It renders one position:absolute; transform-origin:top-left div, sizes its logical canvas to targetWidth, and applies scale = min(1, window.innerWidth / targetWidth) (it only ever scales DOWN, never up). UI is authored in large logical px (menu 1448, HUD 1280) and shrunk to fit.

This is the project's scaling system. Keep it. Do not rip out ScalableContainer, do not rewrite screens as bespoke @media/rem layouts, do not add a second scaler.

The one correct fix

A screen that is "too small / doesn't scale" on a phone has a desktop targetWidth hardcoded. On a 390px phone scale = 390/1280 ≈ 0.30, so everything is 30% size. Fix it by making targetWidth dynamic per device — a smaller target on a narrow portrait phone keeps the on-screen scale near 1, so the UI fills the screen and stays legible.

Use the shared hook — never duplicate the logic, never hardcode:

import { useResponsiveTargetWidth } from '../../../shared/lib/ui-scale/useResponsiveTargetWidth'

const targetWidth = useResponsiveTargetWidth({ desktop: 1448, mobilePortrait: 640 })
// ...
<ScalableContainer targetWidth={targetWidth} zIndex={2}>

src/shared/lib/ui-scale/useResponsiveTargetWidth.ts picks mobilePortrait when innerWidth <= 720 && innerHeight >= innerWidth, else desktop, and reacts to resize / orientationchange.

Per-screen values

Only shrink the target where the screen is genuinely broken. A screen that already looks right on mobile keeps mobilePortrait === desktop (identical to before) — the hook stays for consistency but changes nothing.
Current production values: main menu { desktop: 1448, mobilePortrait: 640 } (was collapsing → now fills the screen); combat HUD { desktop: 1280, mobilePortrait: 1280 } (was already correct → left identical). See src/app/ui/main-menu/MainMenuScreen.tsx and src/features/combat/ui/GameHud/GameHud.tsx.
A screen with more elements (HUD) needs a larger mobile target than a sparse one (menu); tune the number by eye, not by formula.

Forbidden (these are the "костыли с обратным scale")

❌ Per-element compensation like .defeat { transform: scale(2) } to "un-shrink" one panel. If a panel is too small, the whole screen's targetWidth is wrong — fix the target, delete the hack.
❌ Removing ScalableContainer / replacing the transform-scale system.
❌ Duplicating computeMenuTargetWidth-style logic in a screen. Use the shared hook.

Runtime is scale-independent (no logic changes needed)

Touch/combat input does NOT depend on the scale factor: virtual sticks report unit direction vectors, and every world raycast / tap goes through the canvas rect, which is a full-window sibling of the scaler (outside the transform). Self-derived scale fields in InventoryGridPanel / MerchantStockGrid / VirtualStick collapse to 1 and stay correct. Changing targetWidth is a visual-only change.

MANDATORY verification — by eye, headed, both states

Per AGENTS.md #1, never claim a mobile layout "looks right" from tsc/build/code.

Capture a reference BEFORE you change anything. Screenshot the current (correct or broken) screen on a mobile viewport first, so you can compare after. Skipping this is the #1 mistake — you cannot match "identical to before" without it.
Drive a headed browser (chromium.launch({ headless: false }), never headless) against the already-running dev server on :5173 (never kill/restart it — see never-kill-dev-server). Mobile viewport, e.g. { width: 390, height: 844 }, isMobile: true, hasTouch: true.
Reach the real screen:
- Menu: http://localhost:5173/
- Combat HUD: http://localhost:5173/play?class=ember (bare /play renders nothing — it needs ?class=). Wait for canvas + ~12s for the dungeon + HUD.
- The death plaque (!alive && encounterStatus === 'defeat') only draws after a real defeat; confirm on device or force the state for one dev frame.
Screenshot into docs/shots/, open the image and look. Compare against the reference. Verify mobile fills/reads correctly AND desktop (e.g. 1440×900) is unchanged.

Save artifacts in-repo

Verification shots → docs/shots/. Throwaway Playwright scripts run from the repo root (so node_modules resolves) and are deleted after.

Related: memory mobile-scale-dynamic-targetwidth; skills patch9-ui (box-driven chrome already follows element size), ui-kit-architecture, fsd-ecs-architecture.

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name

mobile-ui-scaling

description

Mobile UI scaling — dynamic targetWidth, verified by eye

The system (do NOT replace it)

This is the project's scaling system. Keep it. Do not rip out ScalableContainer, do not rewrite screens as bespoke @media/rem layouts, do not add a second scaler.

The one correct fix

Use the shared hook — never duplicate the logic, never hardcode:

import { useResponsiveTargetWidth } from '../../../shared/lib/ui-scale/useResponsiveTargetWidth'

const targetWidth = useResponsiveTargetWidth({ desktop: 1448, mobilePortrait: 640 })
// ...
<ScalableContainer targetWidth={targetWidth} zIndex={2}>

src/shared/lib/ui-scale/useResponsiveTargetWidth.ts picks mobilePortrait when innerWidth <= 720 && innerHeight >= innerWidth, else desktop, and reacts to resize / orientationchange.

Per-screen values

Only shrink the target where the screen is genuinely broken. A screen that already looks right on mobile keeps mobilePortrait === desktop (identical to before) — the hook stays for consistency but changes nothing.
Current production values: main menu { desktop: 1448, mobilePortrait: 640 } (was collapsing → now fills the screen); combat HUD { desktop: 1280, mobilePortrait: 1280 } (was already correct → left identical). See src/app/ui/main-menu/MainMenuScreen.tsx and src/features/combat/ui/GameHud/GameHud.tsx.
A screen with more elements (HUD) needs a larger mobile target than a sparse one (menu); tune the number by eye, not by formula.

Forbidden (these are the "костыли с обратным scale")

❌ Per-element compensation like .defeat { transform: scale(2) } to "un-shrink" one panel. If a panel is too small, the whole screen's targetWidth is wrong — fix the target, delete the hack.
❌ Removing ScalableContainer / replacing the transform-scale system.
❌ Duplicating computeMenuTargetWidth-style logic in a screen. Use the shared hook.

Runtime is scale-independent (no logic changes needed)

MANDATORY verification — by eye, headed, both states

Per AGENTS.md #1, never claim a mobile layout "looks right" from tsc/build/code.

Capture a reference BEFORE you change anything. Screenshot the current (correct or broken) screen on a mobile viewport first, so you can compare after. Skipping this is the #1 mistake — you cannot match "identical to before" without it.
Drive a headed browser (chromium.launch({ headless: false }), never headless) against the already-running dev server on :5173 (never kill/restart it — see never-kill-dev-server). Mobile viewport, e.g. { width: 390, height: 844 }, isMobile: true, hasTouch: true.
Reach the real screen:
- Menu: http://localhost:5173/
- Combat HUD: http://localhost:5173/play?class=ember (bare /play renders nothing — it needs ?class=). Wait for canvas + ~12s for the dungeon + HUD.
- The death plaque (!alive && encounterStatus === 'defeat') only draws after a real defeat; confirm on device or force the state for one dev frame.
Screenshot into docs/shots/, open the image and look. Compare against the reference. Verify mobile fills/reads correctly AND desktop (e.g. 1440×900) is unchanged.

Save artifacts in-repo

Verification shots → docs/shots/. Throwaway Playwright scripts run from the repo root (so node_modules resolves) and are deleted after.

Related: memory mobile-scale-dynamic-targetwidth; skills patch9-ui (box-driven chrome already follows element size), ui-kit-architecture, fsd-ecs-architecture.