I think LazyColumn and LazyColumnFor still have bu...

# compose

[Bsn Net]

I think LazyColumn and LazyColumnFor still have bug in the LazyListState scroll position, my scenario : I have list of items (100 items), when I scroll down to say item no 30, then I filter the list, so it only has 10 items, it will crashed

java.lang.IllegalStateException: entered drag with non-zero pending scroll: -1403.0696
at androidx.compose.foundation.lazy.LazyListState.onScroll$foundation_release(LazyListState.kt:171)
at androidx.compose.foundation.lazy.LazyListState$scrollableController$1.invoke(LazyListState.kt:144)

On comparison, when I use ScrollableColumn, it works perfectly

[Mohamed Elfiky]

same issue

[Jeremy]

I've also seen issue in alpha04 if one of the rows within LazyColumn is changed size it will leave a blank space rather than compress

[Bsn Net]

Guys, do you know how to programmatically scroll to using LazyColumn ?

[Andrey Kulikov]

thanks for reporting. we will fix it for alpha05

[Jeremy]

alpha04, when using `animate{}` within one of the elements contained in a LazyColumnFor

[Andrey Kulikov]

this bug from the stacktrace is probably already fixed in master, so will be in a new release

[Andrey Kulikov]

Jeremy, are you sure the issue with blank space is reproducible on alpha04, not alpha03? could you please file a bug?

[Bsn Net]

@Andrey Kulikov is there any scroll to function for lazyColumn?

[Andrey Kulikov]

no, we are still working on adding scrollTo() methods on LazyListState, it is not yet ready, sorry

[Bsn Net]

Ok got it

[Prashant Priyadarshi]

@Andrey Kulikov, will the scrollTo() function for LazyListState be available in compose alpha05

[Prashant Priyadarshi]

I am also getting the same error for below code , screen is layed out but error is thrown on scroling

val listState = rememberLazyListState(
initialFirstVisibleItemIndex = someIndex)

putting in stack trace message just for reference

java.lang.IllegalStateException: entered drag with non-zero pending scroll: -657.0
at androidx.compose.foundation.lazy.LazyListState.onScroll$foundation_release(LazyListState.kt:171)
at androidx.compose.foundation.lazy.LazyListState$scrollableController$1.invoke(LazyListState.kt:144)
at androidx.compose.foundation.lazy.LazyListState$scrollableController$1.invoke(LazyListState.kt)
at androidx.compose.foundation.gestures.ScrollableKt$scrollable$4$scrollCallback$1.onScroll(Scrollable.kt:194)
at androidx.compose.ui.gesture.ScrollGestureFilterCoordinator$rawDragObserver$1.onDrag-k-4lQ0M(ScrollGestureFilter.kt:177)
at androidx.compose.ui.gesture.RawDragGestureFilter.onPointerInput-e3WT7_U(RawDragGestureFilter.kt:348)
at androidx.compose.ui.input.pointer.PointerInputFilter.onPointerEvent-d1fqKvQ(PointerEvent.kt:65)
at androidx.compose.ui.input.pointer.Node.dispatchToPointerInputFilter(HitPathTracker.kt:536)
at androidx.compose.ui.input.pointer.Node.dispatchChanges(HitPathTracker.kt:436)
at androidx.compose.ui.input.pointer.Node.dispatchChanges(HitPathTracker.kt:432)
at androidx.compose.ui.input.pointer.NodeParent.dispatchChanges(HitPathTracker.kt:286)
at androidx.compose.ui.input.pointer.HitPathTracker.dispatchChanges(HitPathTracker.kt:133)
at androidx.compose.ui.input.pointer.PointerInputEventProcessor.process-EhkylT0(PointerInputEventProcessor.kt:72)
at androidx.compose.ui.platform.AndroidComposeView.dispatchTouchEvent(AndroidComposeView.kt:613)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2555)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2555)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2555)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2555)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2555)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254)
at com.android.internal.policy.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2403)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1737)
at android.app.Activity.dispatchTouchEvent(Activity.java:2769)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
at com.android.internal.policy.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2364)
at android.view.View.dispatchPointerEvent(View.java:9517)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4242)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4108)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3654)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3707)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3673)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3799)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3681)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3856)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3654)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3707)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3673)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3681)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3654)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5969)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5908)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5869)
at android.view.ViewRootImpl$WindowInputEventReceiver.o

[Andrey Kulikov]

this crash will be fixed in alpha05. scrollTo will not make it to alpha 05, sorry