See inline commentary. I don't really have any energy left to provide
anything else, other than maybe a demonstration of how this dies in
framework:
diff --git a/osu.Framework.Tests/Visual/UserInterface/TestSceneScreenStackUnbindOnExit.cs b/osu.Framework.Tests/Visual/UserInterface/TestSceneScreenStackUnbindOnExit.cs
new file mode 100644
index 000000000..c74ce6636
--- /dev/null
+++ b/osu.Framework.Tests/Visual/UserInterface/TestSceneScreenStackUnbindOnExit.cs
@@ -0,0 +1,59 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using NUnit.Framework;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics.UserInterface;
+using osu.Framework.Screens;
+
+namespace osu.Framework.Tests.Visual.UserInterface
+{
+ public partial class TestSceneScreenStackUnbindOnExit : FrameworkTestScene
+ {
+ [Cached]
+ private ScreenStack screenStack = new ScreenStack();
+
+ [Test]
+ public void TestScreenExitUnbindDoesNotInterruptLoadComplete()
+ {
+ AddStep("set up the scenario", () =>
+ {
+ Child = screenStack;
+ screenStack.Push(new Screen());
+ screenStack.Push(new BrokenScreen());
+ });
+ AddUntilStep("wait to get to target screen", () => screenStack.CurrentScreen, Is.InstanceOf<Screen>);
+ }
+
+ private partial class BrokenSlider : BasicSliderBar<float>
+ {
+ [Resolved]
+ private ScreenStack screenStack { get; set; } = null!;
+
+ protected override void LoadComplete()
+ {
+ // exiting the current screen provokes the behaviour of unbinding all bindables in the screen's subtree
+ screenStack.CurrentScreen.Exit();
+
+ // ...but the following calls should still take correct effect inside `SliderBar`
+ // (namely one consisting of propagating `{Min,Max}Value` into `currentNumberInstantaneous`)
+ // so that it doesn't have its internal invariants violated
+ CurrentNumber.MinValue = -10;
+ CurrentNumber.MaxValue = 10;
+
+ // this notably calls `Scheduler.AddOnce(updateValue)` inside, which will happen *in the imminent future, in the same frame as `LoadComplete()` here.
+ // if the above mutations of `{Min,Max}Value` don't correctly propagate inside the slider bar due to an overly eager unbind, this will cause a crash.
+ base.LoadComplete();
+ }
+ }
+
+ private partial class BrokenScreen : Screen
+ {
+ [BackgroundDependencyLoader]
+ private void load()
+ {
+ InternalChild = new BrokenSlider();
+ }
+ }
+ }
+}
I attempted to address what I perceive to be the root issue here which
is that `ScreenStack` is allowed to arbitrarily unbind bindables under
drawables which are by all means still in the scene graph. The attempt
consisted of scheduling the unbind until after children of the screen
stack, but that caused 150 game-side tests to fail, seemingly on
something relevant to bindable leases, so I give up.
The test scene doesn't exercise the custom sample playback, but I hope I
can be forgiven for this as setting up a custom editor beatmap just for
this to work is rather cumbersome.
In order of severity:
- You could actually click on the textbox portion of a disabled textbox,
focus it, select text, input stuff, and commit, which would die
on the spot.
- The slider part had no visual indication that it's not interactable
anymore.
Intended to match the rest of the UI which is less rounded these days.
See inline comment for reason for not matching `FormControl` corner
radius just yet.
- Below 20 custom sample sets, they are shown as ternary buttons.
- Above 20 custom sample sets, they are shown in a dropdown (yes there
are actual cases of this as I've been informed by the NAT; one example
being https://osu.ppy.sh/beatmapsets/1018061#osu/2197383)
As a bonus, to make determining what the heck is actually changing when
adjusting these controls, the full set of applicable sounds now plays on
adding/removing additions, changing their banks, as well as changing the
custom set (if any).
For now there are no user-facing controls to add the samples to the map
yourself, you have to know how to name the `.wav`s and edit-externally
them in yourself. *For now.*