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Code Issues Releases Wiki Activity

Fix scroll operations in SectionsContainer failing if target moves due to loaded content

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This commit is contained in:
Dean Herbert 2023-06-07 15:24:12 +09:00
parent 7d49f5d7c6
commit 67e952150f
1 changed files with 42 additions and 6 deletions
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48
osu.Game/Graphics/Containers/SectionsContainer.cs
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@ -9,6 +9,8 @@ using osu.Framework.Bindables;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Layout;
using osu.Framework.Logging;
using osu.Framework.Threading;
using osu.Framework.Utils;
namespace osu.Game.Graphics.Containers
@ -156,23 +158,57 @@ namespace osu.Game.Graphics.Containers
footerHeight = null;
}
private ScheduledDelegate? scrollToTargetDelegate;
public void ScrollTo(Drawable target)
{
Logger.Log($"Scrolling to {target}..");
lastKnownScroll = null;
// implementation similar to ScrollIntoView but a bit more nuanced.
float top = scrollContainer.GetChildPosInContent(target);
float scrollTarget = getScrollTargetForDrawable(target);
float bottomScrollExtent = scrollContainer.ScrollableExtent;
float scrollTarget = top - scrollContainer.DisplayableContent * scroll_y_centre;
if (scrollTarget > bottomScrollExtent)
if (scrollTarget > scrollContainer.ScrollableExtent)
scrollContainer.ScrollToEnd();
else
scrollContainer.ScrollTo(scrollTarget);
if (target is T section)
lastClickedSection = section;
// Content may load in as a scroll occurs, changing the scroll target we need to aim for.
// This scheduled operation ensures that we keep trying until actually arriving at the target.
scrollToTargetDelegate?.Cancel();
scrollToTargetDelegate = Scheduler.AddDelayed(() =>
{
if (scrollContainer.UserScrolling)
{
Logger.Log("Scroll operation interrupted by user scroll");
scrollToTargetDelegate?.Cancel();
scrollToTargetDelegate = null;
return;
}
if (Precision.AlmostEquals(scrollContainer.Current, scrollTarget, 1))
{
Logger.Log($"Finished scrolling to {target}!");
scrollToTargetDelegate?.Cancel();
scrollToTargetDelegate = null;
return;
}
if (!Precision.AlmostEquals(getScrollTargetForDrawable(target), scrollTarget, 1))
{
Logger.Log($"Reattempting scroll to {target} due to change in position");
ScrollTo(target);
}
}, 50, true);
}
private float getScrollTargetForDrawable(Drawable target)
{
// implementation similar to ScrollIntoView but a bit more nuanced.
return scrollContainer.GetChildPosInContent(target) - scrollContainer.DisplayableContent * scroll_y_centre;
}
public void ScrollToTop() => scrollContainer.ScrollTo(0);