bottom sheet state - progress does not expose correct value

[MFlisar]

When observing the bottom sheet state I see that the progress jumps to 1 as soon as I drag the bottom sheet to 50% and then it stays there.

LaunchedEffect(sheetState.targetDetent, sheetState.progress, sheetState.offset) {
     println("sheetState.progress = ${sheetState.progress}  | sheetState.offset = ${sheetState.offset} | sheetState.targetDetent = ${sheetState.targetDetent.identifier}")
 }

Logs look like following then:

// ... 
sheetState.progress = 0.5208952  | sheetState.offset = 1149.8516 | sheetState.targetDetent = hidden
sheetState.progress = 0.5164543  | sheetState.offset = 1160.5098 | sheetState.targetDetent = hidden
sheetState.progress = 0.5123608  | sheetState.offset = 1170.334 | sheetState.targetDetent = hidden
sheetState.progress = 0.5083179  | sheetState.offset = 1180.0371 | sheetState.targetDetent = hidden
sheetState.progress = 0.5039864  | sheetState.offset = 1190.4326 | sheetState.targetDetent = hidden
sheetState.progress = 0.50002766  | sheetState.offset = 1199.9336 | sheetState.targetDetent = hidden
sheetState.progress = 1.0  | sheetState.offset = 1208.8184 | sheetState.targetDetent = fully-expanded
sheetState.progress = 1.0  | sheetState.offset = 1217.7559 | sheetState.targetDetent = fully-expanded
sheetState.progress = 1.0  | sheetState.offset = 1225.1719 | sheetState.targetDetent = fully-expanded
sheetState.progress = 1.0  | sheetState.offset = 1232.7891 | sheetState.targetDetent = fully-expanded
// ... 

Seems like the internal logic skips the next best value (the closest inside UnstyledDraggableAnchors) and as a side effect the progress between settled and target instantly becomes 1...

Notes

• I use version 1.20.0
• I use a bottom sheet with extended and hidden state only

[feresr]

+1 I'm facing the same issue!

[alexstyl]

Thanks for reporting this issue @MFlisar. I am planning of having a look at all the issues around the end of this week.

Could you both kindly let me know if this is a blocker for you or how it affects you?

[feresr]

Hey @alexstyl thanks for the follow-up, it's not a blocker in my case, just a UI tweak.
I'm trying to hook up the Scrim alpha to this value so that it appears/disappears as the user pulls the sheet down.

[MFlisar]

I'm doing something similar - I want to animate something in parallel to the bottom sheet. No big deal though as long as sheetState.offset is working, I can always calculate the progress myself...

[hannta]

I'm also facing this issue when trying to animate content based on the bottom sheet's position.

As others have mentioned, the workaround is to use sheetState.offset. Though the documentation states that offset ranges from 0 to 1, it actually is the sheet's height. Because of this, sheetState.isIdle does not work as expected, it checks whether offset is exactly 1 or 0.