Merge "Remove Pager from PlatformComposeCore (1/2)" into udc-qpr-dev am: ef900a3efa

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24146484

Change-Id: Id52c5d9a27f071d90c5e3685f77672f4e04ec5ad
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

3 files changed, 0 insertions, 975 deletions

diff --git a/packages/SystemUI/compose/core/src/com/android/compose/pager/Pager.kt b/packages/SystemUI/compose/core/src/com/android/compose/pager/Pager.kt
deleted file mode 100644
index a80a1f934dab..000000000000
--- a/packages/SystemUI/compose/core/src/com/android/compose/pager/Pager.kt
+++ /dev/null
@@ -1,357 +0,0 @@
-/*
- * Copyright (C) 2022 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.compose.pager
-
-import androidx.compose.animation.core.AnimationSpec
-import androidx.compose.animation.core.DecayAnimationSpec
-import androidx.compose.animation.rememberSplineBasedDecay
-import androidx.compose.foundation.gestures.FlingBehavior
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.PaddingValues
-import androidx.compose.foundation.layout.wrapContentSize
-import androidx.compose.foundation.lazy.LazyColumn
-import androidx.compose.foundation.lazy.LazyRow
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.Stable
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.snapshotFlow
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.geometry.Offset
-import androidx.compose.ui.input.nestedscroll.NestedScrollConnection
-import androidx.compose.ui.input.nestedscroll.NestedScrollSource
-import androidx.compose.ui.input.nestedscroll.nestedScroll
-import androidx.compose.ui.unit.Dp
-import androidx.compose.ui.unit.Velocity
-import androidx.compose.ui.unit.dp
-import kotlinx.coroutines.flow.filter
-
-/** Library-wide switch to turn on debug logging. */
-internal const val DebugLog = false
-
-@RequiresOptIn(message = "Accompanist Pager is experimental. The API may be changed in the future.")
-@Retention(AnnotationRetention.BINARY)
-annotation class ExperimentalPagerApi
-
-/** Contains the default values used by [HorizontalPager] and [VerticalPager]. */
-@ExperimentalPagerApi
-object PagerDefaults {
-    /**
-     * Remember the default [FlingBehavior] that represents the scroll curve.
-     *
-     * @param state The [PagerState] to update.
-     * @param decayAnimationSpec The decay animation spec to use for decayed flings.
-     * @param snapAnimationSpec The animation spec to use when snapping.
-     */
-    @Composable
-    fun flingBehavior(
-        state: PagerState,
-        decayAnimationSpec: DecayAnimationSpec<Float> = rememberSplineBasedDecay(),
-        snapAnimationSpec: AnimationSpec<Float> = SnappingFlingBehaviorDefaults.snapAnimationSpec,
-    ): FlingBehavior =
-        rememberSnappingFlingBehavior(
-            lazyListState = state.lazyListState,
-            decayAnimationSpec = decayAnimationSpec,
-            snapAnimationSpec = snapAnimationSpec,
-        )
-
-    @Deprecated(
-        "Replaced with PagerDefaults.flingBehavior()",
-        ReplaceWith("PagerDefaults.flingBehavior(state, decayAnimationSpec, snapAnimationSpec)")
-    )
-    @Composable
-    fun rememberPagerFlingConfig(
-        state: PagerState,
-        decayAnimationSpec: DecayAnimationSpec<Float> = rememberSplineBasedDecay(),
-        snapAnimationSpec: AnimationSpec<Float> = SnappingFlingBehaviorDefaults.snapAnimationSpec,
-    ): FlingBehavior = flingBehavior(state, decayAnimationSpec, snapAnimationSpec)
-}
-
-/**
- * A horizontally scrolling layout that allows users to flip between items to the left and right.
- *
- * @param count the number of pages.
- * @param modifier the modifier to apply to this layout.
- * @param state the state object to be used to control or observe the pager's state.
- * @param reverseLayout reverse the direction of scrolling and layout, when `true` items will be
- *   composed from the end to the start and [PagerState.currentPage] == 0 will mean the first item
- *   is located at the end.
- * @param itemSpacing horizontal spacing to add between items.
- * @param flingBehavior logic describing fling behavior.
- * @param key the scroll position will be maintained based on the key, which means if you add/remove
- *   items before the current visible item the item with the given key will be kept as the first
- *   visible one.
- * @param content a block which describes the content. Inside this block you can reference
- *   [PagerScope.currentPage] and other properties in [PagerScope].
- * @sample com.google.accompanist.sample.pager.HorizontalPagerSample
- */
-@ExperimentalPagerApi
-@Composable
-fun HorizontalPager(
-    count: Int,
-    modifier: Modifier = Modifier,
-    state: PagerState = rememberPagerState(),
-    reverseLayout: Boolean = false,
-    itemSpacing: Dp = 0.dp,
-    flingBehavior: FlingBehavior = PagerDefaults.flingBehavior(state),
-    verticalAlignment: Alignment.Vertical = Alignment.CenterVertically,
-    key: ((page: Int) -> Any)? = null,
-    contentPadding: PaddingValues = PaddingValues(0.dp),
-    content: @Composable PagerScope.(page: Int) -> Unit,
-) {
-    Pager(
-        count = count,
-        state = state,
-        modifier = modifier,
-        isVertical = false,
-        reverseLayout = reverseLayout,
-        itemSpacing = itemSpacing,
-        verticalAlignment = verticalAlignment,
-        flingBehavior = flingBehavior,
-        key = key,
-        contentPadding = contentPadding,
-        content = content
-    )
-}
-
-/**
- * A vertically scrolling layout that allows users to flip between items to the top and bottom.
- *
- * @param count the number of pages.
- * @param modifier the modifier to apply to this layout.
- * @param state the state object to be used to control or observe the pager's state.
- * @param reverseLayout reverse the direction of scrolling and layout, when `true` items will be
- *   composed from the bottom to the top and [PagerState.currentPage] == 0 will mean the first item
- *   is located at the bottom.
- * @param itemSpacing vertical spacing to add between items.
- * @param flingBehavior logic describing fling behavior.
- * @param key the scroll position will be maintained based on the key, which means if you add/remove
- *   items before the current visible item the item with the given key will be kept as the first
- *   visible one.
- * @param content a block which describes the content. Inside this block you can reference
- *   [PagerScope.currentPage] and other properties in [PagerScope].
- * @sample com.google.accompanist.sample.pager.VerticalPagerSample
- */
-@ExperimentalPagerApi
-@Composable
-fun VerticalPager(
-    count: Int,
-    modifier: Modifier = Modifier,
-    state: PagerState = rememberPagerState(),
-    reverseLayout: Boolean = false,
-    itemSpacing: Dp = 0.dp,
-    flingBehavior: FlingBehavior = PagerDefaults.flingBehavior(state),
-    horizontalAlignment: Alignment.Horizontal = Alignment.CenterHorizontally,
-    key: ((page: Int) -> Any)? = null,
-    contentPadding: PaddingValues = PaddingValues(0.dp),
-    content: @Composable PagerScope.(page: Int) -> Unit,
-) {
-    Pager(
-        count = count,
-        state = state,
-        modifier = modifier,
-        isVertical = true,
-        reverseLayout = reverseLayout,
-        itemSpacing = itemSpacing,
-        horizontalAlignment = horizontalAlignment,
-        flingBehavior = flingBehavior,
-        key = key,
-        contentPadding = contentPadding,
-        content = content
-    )
-}
-
-@ExperimentalPagerApi
-@Composable
-internal fun Pager(
-    count: Int,
-    modifier: Modifier,
-    state: PagerState,
-    reverseLayout: Boolean,
-    itemSpacing: Dp,
-    isVertical: Boolean,
-    flingBehavior: FlingBehavior,
-    key: ((page: Int) -> Any)?,
-    contentPadding: PaddingValues,
-    verticalAlignment: Alignment.Vertical = Alignment.CenterVertically,
-    horizontalAlignment: Alignment.Horizontal = Alignment.CenterHorizontally,
-    content: @Composable PagerScope.(page: Int) -> Unit,
-) {
-    require(count >= 0) { "pageCount must be >= 0" }
-
-    // Provide our PagerState with access to the SnappingFlingBehavior animation target
-    // TODO: can this be done in a better way?
-    state.flingAnimationTarget = { (flingBehavior as? SnappingFlingBehavior)?.animationTarget }
-
-    LaunchedEffect(count) {
-        state.currentPage = minOf(count - 1, state.currentPage).coerceAtLeast(0)
-    }
-
-    // Once a fling (scroll) has finished, notify the state
-    LaunchedEffect(state) {
-        // When a 'scroll' has finished, notify the state
-        snapshotFlow { state.isScrollInProgress }
-            .filter { !it }
-            .collect { state.onScrollFinished() }
-    }
-
-    val pagerScope = remember(state) { PagerScopeImpl(state) }
-
-    // We only consume nested flings in the main-axis, allowing cross-axis flings to propagate
-    // as normal
-    val consumeFlingNestedScrollConnection =
-        ConsumeFlingNestedScrollConnection(
-            consumeHorizontal = !isVertical,
-            consumeVertical = isVertical,
-        )
-
-    if (isVertical) {
-        LazyColumn(
-            state = state.lazyListState,
-            verticalArrangement = Arrangement.spacedBy(itemSpacing, verticalAlignment),
-            horizontalAlignment = horizontalAlignment,
-            flingBehavior = flingBehavior,
-            reverseLayout = reverseLayout,
-            contentPadding = contentPadding,
-            modifier = modifier,
-        ) {
-            items(
-                count = count,
-                key = key,
-            ) { page ->
-                Box(
-                    Modifier
-                        // We don't any nested flings to continue in the pager, so we add a
-                        // connection which consumes them.
-                        // See: https://github.com/google/accompanist/issues/347
-                        .nestedScroll(connection = consumeFlingNestedScrollConnection)
-                        // Constraint the content to be <= than the size of the pager.
-                        .fillParentMaxHeight()
-                        .wrapContentSize()
-                ) {
-                    pagerScope.content(page)
-                }
-            }
-        }
-    } else {
-        LazyRow(
-            state = state.lazyListState,
-            verticalAlignment = verticalAlignment,
-            horizontalArrangement = Arrangement.spacedBy(itemSpacing, horizontalAlignment),
-            flingBehavior = flingBehavior,
-            reverseLayout = reverseLayout,
-            contentPadding = contentPadding,
-            modifier = modifier,
-        ) {
-            items(
-                count = count,
-                key = key,
-            ) { page ->
-                Box(
-                    Modifier
-                        // We don't any nested flings to continue in the pager, so we add a
-                        // connection which consumes them.
-                        // See: https://github.com/google/accompanist/issues/347
-                        .nestedScroll(connection = consumeFlingNestedScrollConnection)
-                        // Constraint the content to be <= than the size of the pager.
-                        .fillParentMaxWidth()
-                        .wrapContentSize()
-                ) {
-                    pagerScope.content(page)
-                }
-            }
-        }
-    }
-}
-
-private class ConsumeFlingNestedScrollConnection(
-    private val consumeHorizontal: Boolean,
-    private val consumeVertical: Boolean,
-) : NestedScrollConnection {
-    override fun onPostScroll(
-        consumed: Offset,
-        available: Offset,
-        source: NestedScrollSource
-    ): Offset =
-        when (source) {
-            // We can consume all resting fling scrolls so that they don't propagate up to the
-            // Pager
-            NestedScrollSource.Fling -> available.consume(consumeHorizontal, consumeVertical)
-            else -> Offset.Zero
-        }
-
-    override suspend fun onPostFling(consumed: Velocity, available: Velocity): Velocity {
-        // We can consume all post fling velocity on the main-axis
-        // so that it doesn't propagate up to the Pager
-        return available.consume(consumeHorizontal, consumeVertical)
-    }
-}
-
-private fun Offset.consume(
-    consumeHorizontal: Boolean,
-    consumeVertical: Boolean,
-): Offset =
-    Offset(
-        x = if (consumeHorizontal) this.x else 0f,
-        y = if (consumeVertical) this.y else 0f,
-    )
-
-private fun Velocity.consume(
-    consumeHorizontal: Boolean,
-    consumeVertical: Boolean,
-): Velocity =
-    Velocity(
-        x = if (consumeHorizontal) this.x else 0f,
-        y = if (consumeVertical) this.y else 0f,
-    )
-
-/** Scope for [HorizontalPager] content. */
-@ExperimentalPagerApi
-@Stable
-interface PagerScope {
-    /** Returns the current selected page */
-    val currentPage: Int
-
-    /** The current offset from the start of [currentPage], as a ratio of the page width. */
-    val currentPageOffset: Float
-}
-
-@ExperimentalPagerApi
-private class PagerScopeImpl(
-    private val state: PagerState,
-) : PagerScope {
-    override val currentPage: Int
-        get() = state.currentPage
-    override val currentPageOffset: Float
-        get() = state.currentPageOffset
-}
-
-/**
- * Calculate the offset for the given [page] from the current scroll position. This is useful when
- * using the scroll position to apply effects or animations to items.
- *
- * The returned offset can positive or negative, depending on whether which direction the [page] is
- * compared to the current scroll position.
- *
- * @sample com.google.accompanist.sample.pager.HorizontalPagerWithOffsetTransition
- */
-@ExperimentalPagerApi
-fun PagerScope.calculateCurrentOffsetForPage(page: Int): Float {
-    return (currentPage + currentPageOffset) - page
-}
diff --git a/packages/SystemUI/compose/core/src/com/android/compose/pager/PagerState.kt b/packages/SystemUI/compose/core/src/com/android/compose/pager/PagerState.kt
deleted file mode 100644
index 1822a68f1e77..000000000000
--- a/packages/SystemUI/compose/core/src/com/android/compose/pager/PagerState.kt
+++ /dev/null
@@ -1,348 +0,0 @@
-/*
- * Copyright (C) 2022 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.compose.pager
-
-import androidx.annotation.FloatRange
-import androidx.annotation.IntRange
-import androidx.compose.animation.core.AnimationSpec
-import androidx.compose.animation.core.spring
-import androidx.compose.foundation.MutatePriority
-import androidx.compose.foundation.gestures.ScrollScope
-import androidx.compose.foundation.gestures.ScrollableState
-import androidx.compose.foundation.interaction.InteractionSource
-import androidx.compose.foundation.lazy.LazyListItemInfo
-import androidx.compose.foundation.lazy.LazyListState
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.Stable
-import androidx.compose.runtime.derivedStateOf
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.saveable.Saver
-import androidx.compose.runtime.saveable.listSaver
-import androidx.compose.runtime.saveable.rememberSaveable
-import androidx.compose.runtime.setValue
-import kotlin.math.absoluteValue
-import kotlin.math.roundToInt
-
-@Deprecated(
-    "Replaced with rememberPagerState(initialPage) and count parameter on Pager composables",
-    ReplaceWith("rememberPagerState(initialPage)"),
-    level = DeprecationLevel.ERROR,
-)
-@Suppress("UNUSED_PARAMETER", "NOTHING_TO_INLINE")
-@ExperimentalPagerApi
-@Composable
-inline fun rememberPagerState(
-    @IntRange(from = 0) pageCount: Int,
-    @IntRange(from = 0) initialPage: Int = 0,
-    @FloatRange(from = 0.0, to = 1.0) initialPageOffset: Float = 0f,
-    @IntRange(from = 1) initialOffscreenLimit: Int = 1,
-    infiniteLoop: Boolean = false
-): PagerState {
-    return rememberPagerState(initialPage = initialPage)
-}
-
-/**
- * Creates a [PagerState] that is remembered across compositions.
- *
- * Changes to the provided values for [initialPage] will **not** result in the state being recreated
- * or changed in any way if it has already been created.
- *
- * @param initialPage the initial value for [PagerState.currentPage]
- */
-@ExperimentalPagerApi
-@Composable
-fun rememberPagerState(
-    @IntRange(from = 0) initialPage: Int = 0,
-): PagerState =
-    rememberSaveable(saver = PagerState.Saver) {
-        PagerState(
-            currentPage = initialPage,
-        )
-    }
-
-/**
- * A state object that can be hoisted to control and observe scrolling for [HorizontalPager].
- *
- * In most cases, this will be created via [rememberPagerState].
- *
- * @param currentPage the initial value for [PagerState.currentPage]
- */
-@ExperimentalPagerApi
-@Stable
-class PagerState(
-    @IntRange(from = 0) currentPage: Int = 0,
-) : ScrollableState {
-    // Should this be public?
-    internal val lazyListState = LazyListState(firstVisibleItemIndex = currentPage)
-
-    private var _currentPage by mutableStateOf(currentPage)
-
-    private val currentLayoutPageInfo: LazyListItemInfo?
-        get() =
-            lazyListState.layoutInfo.visibleItemsInfo
-                .asSequence()
-                .filter { it.offset <= 0 && it.offset + it.size > 0 }
-                .lastOrNull()
-
-    private val currentLayoutPageOffset: Float
-        get() =
-            currentLayoutPageInfo?.let { current ->
-                // We coerce since itemSpacing can make the offset > 1f.
-                // We don't want to count spacing in the offset so cap it to 1f
-                (-current.offset / current.size.toFloat()).coerceIn(0f, 1f)
-            }
-                ?: 0f
-
-    /**
-     * [InteractionSource] that will be used to dispatch drag events when this list is being
-     * dragged. If you want to know whether the fling (or animated scroll) is in progress, use
-     * [isScrollInProgress].
-     */
-    val interactionSource: InteractionSource
-        get() = lazyListState.interactionSource
-
-    /** The number of pages to display. */
-    @get:IntRange(from = 0)
-    val pageCount: Int by derivedStateOf { lazyListState.layoutInfo.totalItemsCount }
-
-    /**
-     * The index of the currently selected page. This may not be the page which is currently
-     * displayed on screen.
-     *
-     * To update the scroll position, use [scrollToPage] or [animateScrollToPage].
-     */
-    @get:IntRange(from = 0)
-    var currentPage: Int
-        get() = _currentPage
-        internal set(value) {
-            if (value != _currentPage) {
-                _currentPage = value
-            }
-        }
-
-    /**
-     * The current offset from the start of [currentPage], as a ratio of the page width.
-     *
-     * To update the scroll position, use [scrollToPage] or [animateScrollToPage].
-     */
-    val currentPageOffset: Float by derivedStateOf {
-        currentLayoutPageInfo?.let {
-            // The current page offset is the current layout page delta from `currentPage`
-            // (which is only updated after a scroll/animation).
-            // We calculate this by looking at the current layout page + it's offset,
-            // then subtracting the 'current page'.
-            it.index + currentLayoutPageOffset - _currentPage
-        }
-            ?: 0f
-    }
-
-    /** The target page for any on-going animations. */
-    private var animationTargetPage: Int? by mutableStateOf(null)
-
-    internal var flingAnimationTarget: (() -> Int?)? by mutableStateOf(null)
-
-    /**
-     * The target page for any on-going animations or scrolls by the user. Returns the current page
-     * if a scroll or animation is not currently in progress.
-     */
-    val targetPage: Int
-        get() =
-            animationTargetPage
-                ?: flingAnimationTarget?.invoke()
-                    ?: when {
-                    // If a scroll isn't in progress, return the current page
-                    !isScrollInProgress -> currentPage
-                    // If the offset is 0f (or very close), return the current page
-                    currentPageOffset.absoluteValue < 0.001f -> currentPage
-                    // If we're offset towards the start, guess the previous page
-                    currentPageOffset < -0.5f -> (currentPage - 1).coerceAtLeast(0)
-                    // If we're offset towards the end, guess the next page
-                    else -> (currentPage + 1).coerceAtMost(pageCount - 1)
-                }
-
-    @Deprecated(
-        "Replaced with animateScrollToPage(page, pageOffset)",
-        ReplaceWith("animateScrollToPage(page = page, pageOffset = pageOffset)")
-    )
-    @Suppress("UNUSED_PARAMETER")
-    suspend fun animateScrollToPage(
-        @IntRange(from = 0) page: Int,
-        @FloatRange(from = 0.0, to = 1.0) pageOffset: Float = 0f,
-        animationSpec: AnimationSpec<Float> = spring(),
-        initialVelocity: Float = 0f,
-        skipPages: Boolean = true,
-    ) {
-        animateScrollToPage(page = page, pageOffset = pageOffset)
-    }
-
-    /**
-     * Animate (smooth scroll) to the given page to the middle of the viewport.
-     *
-     * Cancels the currently running scroll, if any, and suspends until the cancellation is
-     * complete.
-     *
-     * @param page the page to animate to. Must be between 0 and [pageCount] (inclusive).
-     * @param pageOffset the percentage of the page width to offset, from the start of [page]. Must
-     *   be in the range 0f..1f.
-     */
-    suspend fun animateScrollToPage(
-        @IntRange(from = 0) page: Int,
-        @FloatRange(from = 0.0, to = 1.0) pageOffset: Float = 0f,
-    ) {
-        requireCurrentPage(page, "page")
-        requireCurrentPageOffset(pageOffset, "pageOffset")
-        try {
-            animationTargetPage = page
-
-            if (pageOffset <= 0.005f) {
-                // If the offset is (close to) zero, just call animateScrollToItem and we're done
-                lazyListState.animateScrollToItem(index = page)
-            } else {
-                // Else we need to figure out what the offset is in pixels...
-
-                var target =
-                    lazyListState.layoutInfo.visibleItemsInfo.firstOrNull { it.index == page }
-
-                if (target != null) {
-                    // If we have access to the target page layout, we can calculate the pixel
-                    // offset from the size
-                    lazyListState.animateScrollToItem(
-                        index = page,
-                        scrollOffset = (target.size * pageOffset).roundToInt()
-                    )
-                } else {
-                    // If we don't, we use the current page size as a guide
-                    val currentSize = currentLayoutPageInfo!!.size
-                    lazyListState.animateScrollToItem(
-                        index = page,
-                        scrollOffset = (currentSize * pageOffset).roundToInt()
-                    )
-
-                    // The target should be visible now
-                    target = lazyListState.layoutInfo.visibleItemsInfo.first { it.index == page }
-
-                    if (target.size != currentSize) {
-                        // If the size we used for calculating the offset differs from the actual
-                        // target page size, we need to scroll again. This doesn't look great,
-                        // but there's not much else we can do.
-                        lazyListState.animateScrollToItem(
-                            index = page,
-                            scrollOffset = (target.size * pageOffset).roundToInt()
-                        )
-                    }
-                }
-            }
-        } finally {
-            // We need to manually call this, as the `animateScrollToItem` call above will happen
-            // in 1 frame, which is usually too fast for the LaunchedEffect in Pager to detect
-            // the change. This is especially true when running unit tests.
-            onScrollFinished()
-        }
-    }
-
-    /**
-     * Instantly brings the item at [page] to the middle of the viewport.
-     *
-     * Cancels the currently running scroll, if any, and suspends until the cancellation is
-     * complete.
-     *
-     * @param page the page to snap to. Must be between 0 and [pageCount] (inclusive).
-     */
-    suspend fun scrollToPage(
-        @IntRange(from = 0) page: Int,
-        @FloatRange(from = 0.0, to = 1.0) pageOffset: Float = 0f,
-    ) {
-        requireCurrentPage(page, "page")
-        requireCurrentPageOffset(pageOffset, "pageOffset")
-        try {
-            animationTargetPage = page
-
-            // First scroll to the given page. It will now be laid out at offset 0
-            lazyListState.scrollToItem(index = page)
-
-            // If we have a start spacing, we need to offset (scroll) by that too
-            if (pageOffset > 0.0001f) {
-                scroll { currentLayoutPageInfo?.let { scrollBy(it.size * pageOffset) } }
-            }
-        } finally {
-            // We need to manually call this, as the `scroll` call above will happen in 1 frame,
-            // which is usually too fast for the LaunchedEffect in Pager to detect the change.
-            // This is especially true when running unit tests.
-            onScrollFinished()
-        }
-    }
-
-    internal fun onScrollFinished() {
-        // Then update the current page to our layout page
-        currentPage = currentLayoutPageInfo?.index ?: 0
-        // Clear the animation target page
-        animationTargetPage = null
-    }
-
-    override suspend fun scroll(
-        scrollPriority: MutatePriority,
-        block: suspend ScrollScope.() -> Unit
-    ) = lazyListState.scroll(scrollPriority, block)
-
-    override fun dispatchRawDelta(delta: Float): Float {
-        return lazyListState.dispatchRawDelta(delta)
-    }
-
-    override val isScrollInProgress: Boolean
-        get() = lazyListState.isScrollInProgress
-
-    override fun toString(): String =
-        "PagerState(" +
-            "pageCount=$pageCount, " +
-            "currentPage=$currentPage, " +
-            "currentPageOffset=$currentPageOffset" +
-            ")"
-
-    private fun requireCurrentPage(value: Int, name: String) {
-        if (pageCount == 0) {
-            require(value == 0) { "$name must be 0 when pageCount is 0" }
-        } else {
-            require(value in 0 until pageCount) { "$name[$value] must be >= 0 and < pageCount" }
-        }
-    }
-
-    private fun requireCurrentPageOffset(value: Float, name: String) {
-        if (pageCount == 0) {
-            require(value == 0f) { "$name must be 0f when pageCount is 0" }
-        } else {
-            require(value in 0f..1f) { "$name must be >= 0 and <= 1" }
-        }
-    }
-
-    companion object {
-        /** The default [Saver] implementation for [PagerState]. */
-        val Saver: Saver<PagerState, *> =
-            listSaver(
-                save = {
-                    listOf<Any>(
-                        it.currentPage,
-                    )
-                },
-                restore = {
-                    PagerState(
-                        currentPage = it[0] as Int,
-                    )
-                }
-            )
-    }
-}
diff --git a/packages/SystemUI/compose/core/src/com/android/compose/pager/SnappingFlingBehavior.kt b/packages/SystemUI/compose/core/src/com/android/compose/pager/SnappingFlingBehavior.kt
deleted file mode 100644
index 98140295306a..000000000000
--- a/packages/SystemUI/compose/core/src/com/android/compose/pager/SnappingFlingBehavior.kt
+++ /dev/null
@@ -1,270 +0,0 @@
-/*
- * Copyright (C) 2022 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.compose.pager
-
-import androidx.compose.animation.core.AnimationSpec
-import androidx.compose.animation.core.AnimationState
-import androidx.compose.animation.core.DecayAnimationSpec
-import androidx.compose.animation.core.animateDecay
-import androidx.compose.animation.core.animateTo
-import androidx.compose.animation.core.calculateTargetValue
-import androidx.compose.animation.core.spring
-import androidx.compose.animation.rememberSplineBasedDecay
-import androidx.compose.foundation.gestures.FlingBehavior
-import androidx.compose.foundation.gestures.ScrollScope
-import androidx.compose.foundation.lazy.LazyListItemInfo
-import androidx.compose.foundation.lazy.LazyListState
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
-import kotlin.math.abs
-
-/** Default values used for [SnappingFlingBehavior] & [rememberSnappingFlingBehavior]. */
-internal object SnappingFlingBehaviorDefaults {
-    /** TODO */
-    val snapAnimationSpec: AnimationSpec<Float> = spring(stiffness = 600f)
-}
-
-/**
- * Create and remember a snapping [FlingBehavior] to be used with [LazyListState].
- *
- * @param lazyListState The [LazyListState] to update.
- * @param decayAnimationSpec The decay animation spec to use for decayed flings.
- * @param snapAnimationSpec The animation spec to use when snapping.
- *
- * TODO: move this to a new module and make it public
- */
-@Composable
-internal fun rememberSnappingFlingBehavior(
-    lazyListState: LazyListState,
-    decayAnimationSpec: DecayAnimationSpec<Float> = rememberSplineBasedDecay(),
-    snapAnimationSpec: AnimationSpec<Float> = SnappingFlingBehaviorDefaults.snapAnimationSpec,
-): SnappingFlingBehavior =
-    remember(lazyListState, decayAnimationSpec, snapAnimationSpec) {
-        SnappingFlingBehavior(
-            lazyListState = lazyListState,
-            decayAnimationSpec = decayAnimationSpec,
-            snapAnimationSpec = snapAnimationSpec,
-        )
-    }
-
-/**
- * A snapping [FlingBehavior] for [LazyListState]. Typically this would be created via
- * [rememberSnappingFlingBehavior].
- *
- * @param lazyListState The [LazyListState] to update.
- * @param decayAnimationSpec The decay animation spec to use for decayed flings.
- * @param snapAnimationSpec The animation spec to use when snapping.
- */
-internal class SnappingFlingBehavior(
-    private val lazyListState: LazyListState,
-    private val decayAnimationSpec: DecayAnimationSpec<Float>,
-    private val snapAnimationSpec: AnimationSpec<Float>,
-) : FlingBehavior {
-    /** The target item index for any on-going animations. */
-    var animationTarget: Int? by mutableStateOf(null)
-        private set
-
-    override suspend fun ScrollScope.performFling(initialVelocity: Float): Float {
-        val itemInfo = currentItemInfo ?: return initialVelocity
-
-        // If the decay fling can scroll past the current item, fling with decay
-        return if (decayAnimationSpec.canFlingPastCurrentItem(itemInfo, initialVelocity)) {
-            performDecayFling(initialVelocity, itemInfo)
-        } else {
-            // Otherwise we 'spring' to current/next item
-            performSpringFling(
-                index =
-                    when {
-                        // If the velocity is greater than 1 item per second (velocity is px/s),
-                        // spring
-                        // in the relevant direction
-                        initialVelocity > itemInfo.size -> {
-                            (itemInfo.index + 1).coerceAtMost(
-                                lazyListState.layoutInfo.totalItemsCount - 1
-                            )
-                        }
-                        initialVelocity < -itemInfo.size -> itemInfo.index
-                        // If the velocity is 0 (or less than the size of the item), spring to
-                        // whichever item is closest to the snap point
-                        itemInfo.offset < -itemInfo.size / 2 -> itemInfo.index + 1
-                        else -> itemInfo.index
-                    },
-                initialVelocity = initialVelocity,
-            )
-        }
-    }
-
-    private suspend fun ScrollScope.performDecayFling(
-        initialVelocity: Float,
-        startItem: LazyListItemInfo,
-    ): Float {
-        val index =
-            when {
-                initialVelocity > 0 -> startItem.index + 1
-                else -> startItem.index
-            }
-        val forward = index > (currentItemInfo?.index ?: return initialVelocity)
-
-        // Update the animationTarget
-        animationTarget = index
-
-        var velocityLeft = initialVelocity
-        var lastValue = 0f
-        AnimationState(
-                initialValue = 0f,
-                initialVelocity = initialVelocity,
-            )
-            .animateDecay(decayAnimationSpec) {
-                val delta = value - lastValue
-                val consumed = scrollBy(delta)
-                lastValue = value
-                velocityLeft = this.velocity
-
-                val current = currentItemInfo
-                if (current == null) {
-                    cancelAnimation()
-                    return@animateDecay
-                }
-
-                if (
-                    !forward &&
-                        (current.index < index || current.index == index && current.offset >= 0)
-                ) {
-                    // 'snap back' to the item as we may have scrolled past it
-                    scrollBy(lazyListState.calculateScrollOffsetToItem(index).toFloat())
-                    cancelAnimation()
-                } else if (
-                    forward &&
-                        (current.index > index || current.index == index && current.offset <= 0)
-                ) {
-                    // 'snap back' to the item as we may have scrolled past it
-                    scrollBy(lazyListState.calculateScrollOffsetToItem(index).toFloat())
-                    cancelAnimation()
-                } else if (abs(delta - consumed) > 0.5f) {
-                    // avoid rounding errors and stop if anything is unconsumed
-                    cancelAnimation()
-                }
-            }
-        animationTarget = null
-        return velocityLeft
-    }
-
-    private suspend fun ScrollScope.performSpringFling(
-        index: Int,
-        scrollOffset: Int = 0,
-        initialVelocity: Float = 0f,
-    ): Float {
-        // If we don't have a current layout, we can't snap
-        val initialItem = currentItemInfo ?: return initialVelocity
-
-        val forward = index > initialItem.index
-        // We add 10% on to the size of the current item, to compensate for any item spacing, etc
-        val target = (if (forward) initialItem.size else -initialItem.size) * 1.1f
-
-        // Update the animationTarget
-        animationTarget = index
-
-        var velocityLeft = initialVelocity
-        var lastValue = 0f
-        AnimationState(
-                initialValue = 0f,
-                initialVelocity = initialVelocity,
-            )
-            .animateTo(
-                targetValue = target,
-                animationSpec = snapAnimationSpec,
-            ) {
-                // Springs can overshoot their target, clamp to the desired range
-                val coercedValue =
-                    if (forward) {
-                        value.coerceAtMost(target)
-                    } else {
-                        value.coerceAtLeast(target)
-                    }
-                val delta = coercedValue - lastValue
-                val consumed = scrollBy(delta)
-                lastValue = coercedValue
-                velocityLeft = this.velocity
-
-                val current = currentItemInfo
-                if (current == null) {
-                    cancelAnimation()
-                    return@animateTo
-                }
-
-                if (scrolledPastItem(initialVelocity, current, index, scrollOffset)) {
-                    // If we've scrolled to/past the item, stop the animation. We may also need to
-                    // 'snap back' to the item as we may have scrolled past it
-                    scrollBy(lazyListState.calculateScrollOffsetToItem(index).toFloat())
-                    cancelAnimation()
-                } else if (abs(delta - consumed) > 0.5f) {
-                    // avoid rounding errors and stop if anything is unconsumed
-                    cancelAnimation()
-                }
-            }
-        animationTarget = null
-        return velocityLeft
-    }
-
-    private fun LazyListState.calculateScrollOffsetToItem(index: Int): Int {
-        return layoutInfo.visibleItemsInfo.firstOrNull { it.index == index }?.offset ?: 0
-    }
-
-    private val currentItemInfo: LazyListItemInfo?
-        get() =
-            lazyListState.layoutInfo.visibleItemsInfo
-                .asSequence()
-                .filter { it.offset <= 0 && it.offset + it.size > 0 }
-                .lastOrNull()
-}
-
-private fun scrolledPastItem(
-    initialVelocity: Float,
-    currentItem: LazyListItemInfo,
-    targetIndex: Int,
-    targetScrollOffset: Int = 0,
-): Boolean {
-    return if (initialVelocity > 0) {
-        // forward
-        currentItem.index > targetIndex ||
-            (currentItem.index == targetIndex && currentItem.offset <= targetScrollOffset)
-    } else {
-        // backwards
-        currentItem.index < targetIndex ||
-            (currentItem.index == targetIndex && currentItem.offset >= targetScrollOffset)
-    }
-}
-
-private fun DecayAnimationSpec<Float>.canFlingPastCurrentItem(
-    currentItem: LazyListItemInfo,
-    initialVelocity: Float,
-): Boolean {
-    val targetValue =
-        calculateTargetValue(
-            initialValue = currentItem.offset.toFloat(),
-            initialVelocity = initialVelocity,
-        )
-    return when {
-        // forward. We add 10% onto the size to cater for any item spacing
-        initialVelocity > 0 -> targetValue <= -(currentItem.size * 1.1f)
-        // backwards. We add 10% onto the size to cater for any item spacing
-        else -> targetValue >= (currentItem.size * 0.1f)
-    }
-}