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Code Issues Releases Wiki Activity

Fix possible mis-ordering of scroll position updates

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1. Checking whether the scroll position has changed must be done _after_ Current is updated in base.UpdateAfterChildren. This was causing the timeline to sometimes not provide smooth scrolling while the track is not running.

2. We can't just move all code to UpdateAfterChildren to fulfill (1) - we need the code to follow the track time to still run prior to base.UpdateAfterChildren, so that it modifies Current prior to base.UpdateAfterChildren changing to position.
This commit is contained in:
smoogipoo 2018-06-25 20:31:06 +09:00
parent e75ff1145c
commit cd74ec705e
1 changed files with 28 additions and 28 deletions
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30
osu.Game/Screens/Edit/Screens/Compose/Timeline/Timeline.cs
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@ -88,21 +88,21 @@ namespace osu.Game.Screens.Edit.Screens.Compose.Timeline
// The extrema of track time should be positioned at the centre of the container when scrolled to the start or end
Content.Margin = new MarginPadding { Horizontal = DrawWidth / 2 };
if (handlingDragInput)
{
// The user is dragging - the track should always follow the timeline
seekTrackToCurrent();
}
else if (adjustableClock.IsRunning)
{
// If the user hasn't provided mouse input but the track is running, always follow the track
// This needs to happen after transforms are updated, but before the scroll position is updated in base.UpdateAfterChildren
if (adjustableClock.IsRunning)
scrollToTrackTime();
}
else
protected override void UpdateAfterChildren()
{
// The track isn't playing, so we want to smooth-scroll once more, and re-enable wheel scrolling
// There are two cases we have to be wary of:
// 1) The user scrolls on this timeline: We want the track to follow us
base.UpdateAfterChildren();
if (handlingDragInput)
seekTrackToCurrent();
else if (!adjustableClock.IsRunning)
{
// The track isn't running. There are two cases we have to be wary of:
// 1) The user flick-drags on this timeline: We want the track to follow us
// 2) The user changes the track time through some other means (scrolling in the editor or overview timeline): We want to follow the track time
// The simplest way to cover both cases is by checking whether the scroll position has changed and the audio hasn't been changed externally
@ -114,8 +114,9 @@ namespace osu.Game.Screens.Edit.Screens.Compose.Timeline
lastScrollPosition = Current;
lastTrackTime = adjustableClock.CurrentTime;
}
void seekTrackToCurrent()
private void seekTrackToCurrent()
{
var track = Beatmap.Value.Track;
if (track is TrackVirtual || !track.IsLoaded)
@ -125,7 +126,7 @@ namespace osu.Game.Screens.Edit.Screens.Compose.Timeline
adjustableClock.Seek(Current / Content.DrawWidth * Beatmap.Value.Track.Length);
}
void scrollToTrackTime()
private void scrollToTrackTime()
{
var track = Beatmap.Value.Track;
if (track is TrackVirtual || !track.IsLoaded)
@ -133,7 +134,6 @@ namespace osu.Game.Screens.Edit.Screens.Compose.Timeline
ScrollTo((float)(adjustableClock.CurrentTime / Beatmap.Value.Track.Length) * Content.DrawWidth, false);
}
}
protected override bool OnMouseDown(InputState state, MouseDownEventArgs args)
{