feat: add mobile touch controls to Null Pow!#10
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Add swipe gesture detection for directional input (swipe left/right/up/down to change direction) and tap-to-start for game start/restart. Also adds an on-screen D-pad overlay on touch devices during gameplay as a fallback input method. Overlay text adapts to show touch-specific instructions on mobile. https://claude.ai/code/session_01Acnw2xmmT7syDmbKsjnZkH
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Phaser's scene-level pointer events may not fire until the scene is fully initialized, making taps on the initial screen unresponsive. Switch to native DOM touchstart/touchend events on the game container, which are available immediately regardless of Phaser's boot state. https://claude.ai/code/session_01Acnw2xmmT7syDmbKsjnZkH
The initial screen only accepted Space key via KeyboardInput, making it impossible to start the game on mobile or by clicking. Add a pointerdown handler on the Game component (matching Breakout/Aquarium/Floppy Heads pattern) so click or tap starts/restarts the game from any non-play phase. Update overlay text to mention click as an option on desktop. https://claude.ai/code/session_01Acnw2xmmT7syDmbKsjnZkH
- Add "click on canvas starts the game" test (desktop) - Add "tap on canvas starts the game" test (mobile) - Add "swipe changes player direction" test (mobile, uses TouchEvent dispatch) - Fix beforeEach: use focus() instead of click()/tap() to avoid accidentally starting the game via the new onPointerDown handler All 17 null-pow E2E tests pass (desktop + mobile). https://claude.ai/code/session_01Acnw2xmmT7syDmbKsjnZkH
Root cause: KeyboardInput used `scene.input.keyboard!` (non-null assertion).
On mobile devices where Phaser's keyboard plugin may be null, this crashes
and prevents the entire Game children tree from rendering — including the
onPointerDown handler that should allow taps to start the game.
Fix:
- Rename KeyboardInput → GameInput, combining keyboard + pointer input
- Guard `scene.input.keyboard` with null check (safe skip on mobile)
- Register `scene.input.on("pointerdown")` directly inside the component
(fires reliably on both desktop click and mobile tap)
- Remove separate onPointerDown prop from <Game> (now handled in GameInput)
- Add E2E tests: JS error detection, synthetic TouchEvent tap, debug counters
https://claude.ai/code/session_01Acnw2xmmT7syDmbKsjnZkH
Two fixes:
1. Arrow keys caused page scrolling on desktop — switch from Phaser's
keyboard plugin to document.addEventListener("keydown") with
preventDefault(), matching Floppy Heads' approach.
2. Mobile tap still unreliable — bypass Phaser's input system entirely
and register pointerdown + touchstart listeners directly on the
canvas DOM element via scene.game.canvas. This eliminates dependency
on Phaser's internal touch→pointer conversion pipeline.
Also simplifies touch input: swipe handler now registered on canvas
(not #game-container), tap handled by GameInput's canvas listeners.
https://claude.ai/code/session_01Acnw2xmmT7syDmbKsjnZkH
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Summary
Implementation details
All changes are in
examples/null-pow/src/main.tsx:createSwipeHandler()— Tracks pointer down/up positions viaGame'sonPointerDown/onPointerUpprops, calculates swipe direction or detects tapsDPadcomponent — Phaser GameObjects (rectangles + text arrows) withinteractive+onPointerDownfor direct touch inputisTouchDevicedetection viaontouchstart/maxTouchPointsplayphase on touch devicesTest plan
https://claude.ai/code/session_01Acnw2xmmT7syDmbKsjnZkH