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fix(android): improve touch drag responsiveness

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Two improvements to drag responsiveness on Android:

1. Guard start_drag against touch-simulated mouse presses.
   start_drag (mouse path) now bails when Touches::iter_just_pressed()
   finds an active touch, so touch_start_drag always owns drag state on
   touch-screen devices. Without the guard, Bevy/Winit versions that
   synthesise MouseButton::Left from the primary touch would have the
   mouse drag path claim drag state first (start_drag runs before
   touch_start_drag in the system chain), leaving the card tracked via
   cursor_world instead of the Touches resource.

2. Lower mobile drag commit threshold 10 px → 8 px.
   Matches Android ViewConfiguration.getScaledTouchSlop() exactly.
   Smaller threshold reduces the snap-to-finger displacement at commit
   and makes drag feel more immediate.

Hardware confirmation (verify no stutter, tune if needed) remains a
manual step recorded in PLAYABILITY_TODO.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
funman300
2026-05-11 13:16:27 -07:00
parent 9fb59c7d47
commit 76a754d8e5
3 changed files with 24 additions and 4 deletions
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docs/android/PLAYABILITY_TODO.md
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@@ -107,9 +107,18 @@ rewrites required.
## P2 — Polish
- [ ] **Drag responsiveness on touch.** Bevy default touch-to-mouse
mapping can lag; confirm drag start threshold isn't too high for a
finger.
- [x] **Drag responsiveness on touch.** *Closed 2026-05-11.*
Two code-side improvements shipped; final feel confirmation still needs
hardware:
1. `start_drag` (mouse path) now bails out when a touch is just-pressed
(`Touches::iter_just_pressed()`), ensuring `touch_start_drag` always
owns the drag state on touch-screen devices — including Bevy/Winit
versions that simulate `MouseButton::Left` from the primary touch.
2. Mobile drag commit threshold lowered 10 px → 8 px, matching Android's
`ViewConfiguration.getScaledTouchSlop()` spec. Smaller threshold →
smaller snap-on-commit and faster perceived response.
**Remaining:** connect AVD or device and verify drag feels responsive
with no stutter; tune threshold further if needed.
- [ ] **Long-press menu.** Alternative to right-click (which doesn't
exist on touch). Wire to the existing right-click-highlight system.
- [ ] **HUD typography.** Reduce text sizes for `Score:`, `Moves:`,