feat(ui): UI-Core foundation — scene.ui, focus/keyboard, widgets#138
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Additive UI-Core system (v0.14 Phase 4A, PR1 of 2): - Graphics.drawRoundedRectangle + buildRoundedRectangle (math/geometry) - FocusManager (app.focus / stage.focus): single-focus tracking, Tab/Shift-Tab traversal, focus-scope stack, keyboard routing to the focused node (node.focusable/tabIndex/onFocus/onBlur/onKeyDown) + KeyEvent - Modal input capture: InteractionManager.pushInputCapture/popInputCapture - scene.ui (UIRoot): screen-fixed UI layer auto-rendered above the world; UI is hit-tested in screen space ahead of the camera world, so widgets stay clickable/focusable under a panned camera (UI nodes kept out of the quadtree) - Widgets: Widget base (size/anchoring/enabled) + Label/Panel/Button/ProgressBar + Stack (row/column layout) - Example: examples/ui/hud-and-widgets + chapters/catalog entry Scene-stack simplification (#11) and overlay-example migration follow in PR2.
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v0.14 Phase 4A — UI-Core, PR 1 of 2 (additive, non-breaking).
What
Graphics.drawRoundedRectangle+buildRoundedRectangle(math/geometry)FocusManager(app.focus/stage.focus): single-focus tracking, Tab / Shift+Tab traversal, focus-scope stack, keyboard routing to the focused node —node.focusable/tabIndex/onFocus/onBlur/onKeyDown+KeyEventInteractionManager.pushInputCapture/popInputCapturescene.ui(UIRoot): screen-fixed UI layer, auto-rendered above the world. UI is hit-tested in screen space ahead of the camera world, so widgets stay clickable/focusable under a panned/zoomed camera (UI nodes use a no-op stage and stay out of the world quadtree).Widgetbase (size / anchoring / enabled) +Label/Panel/Button/ProgressBar+Stack(row/column layout)examples/ui/hud-and-widgets(+ chapter/catalog entry)Tests / gates
New tests: math/geometry, input/focus, input/interaction (capture), ui/scene-ui, ui/widgets. All CI-only gates green locally (
pnpm test3265, typecheck, lint:all, format:check, typecheck:examples/guides, docs:api:check, root-index).Follow-up (PR2, breaking)
Scene-stack simplification (#11): remove
SceneStackMode/Participation +pushScene/popScene, migrate overlay examples ontoscene.ui, add the UI guide.