Player request: the Menu / Undo / Pause / Help / Modes / New Game
buttons stay visible during play even when the player isn't looking
at them. Fade them out when the cursor is in the play area, fade
back in when it returns to the top of the window.
Implementation mirrors video-player auto-hide UX:
- HudActionFade resource holds (alpha, target). Default both 1.0 so
the bar starts visible on first launch.
- update_action_fade reads cursor.y each frame, sets target to 1.0
when the cursor is in the top reveal zone (HUD_BAND_HEIGHT + 32 px)
or off-window (keyboard navigation), 0.0 otherwise. Lerps alpha
toward target at 6/sec ≈ 167 ms per full transition.
- apply_action_fade overrides BackgroundColor + child TextColor on
every ActionButton. Runs in Last so a hover-state change in the
same frame doesn't blip back to opaque mid-fade.
No interactivity guard needed: hover requires the cursor to be on a
button, and a faded button is geometrically out of reach (cursor must
re-enter the reveal zone, which is exactly the trigger that fades
the bar back in).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
funman300
c4970b16ea