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Fix slider tails sometimes not dimming correctly

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Originally noticed during review of another change:
https://github.com/ppy/osu/pull/27369#issuecomment-1966140198.

`DrawableOsuHitObject` tries to solve the initial dimming of objects
by applying transform to a list of dimmable parts. For plain drawables
this is safe, but if one of the parts is a DHO, it is not safe,
because drawable transforms can be cleared at will.

In particular, on first use of a drawable slider,
`UpdateInitialTransforms()` would fire via `LoadComplete()` on the
`DrawableSlider`, but *then*, also via `LoadComplete()`,
the `DrawableSliderTail` would update its own state and by doing so
inadvertently clear the dim transform just added by the slider.

To fix, ensure dim transforms are applied to DHOs
via `ApplyCustomUpdateState`.
This commit is contained in:
Bartłomiej Dach 2024-02-27 11:45:03 +01:00
parent 087a2a741a
commit bbdd85020c
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1 changed files with 11 additions and 0 deletions
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11
osu.Game.Rulesets.Osu/Objects/Drawables/DrawableOsuHitObject.cs
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@ -80,6 +80,17 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
base.UpdateInitialTransforms();
foreach (var piece in DimmablePieces)
{
// if the specified dimmable piece is a DHO, it is generally not safe to tack transforms onto it directly
// as they may be cleared via the `updateState()` DHO flow,
// so use `ApplyCustomUpdateState` instead. which does not have this pitfall.
if (piece is DrawableHitObject drawableObjectPiece)
drawableObjectPiece.ApplyCustomUpdateState += (dho, _) => applyDim(dho);
else
applyDim(piece);
}
void applyDim(Drawable piece)
{
piece.FadeColour(new Color4(195, 195, 195, 255));
using (piece.BeginDelayedSequence(InitialLifetimeOffset - OsuHitWindows.MISS_WINDOW))