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Fix Scrollbar when the list contains sticky header (#8181)

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* Fix Scrollbar when the list contains sticky header

* Fix VerticalFastScroller when the list contains sticky header

* exposé
This commit is contained in:
Ivan Iskandar
2022-10-10 22:59:01 +07:00
committed by GitHub
parent 8500add09f
commit fba244423f
3 changed files with 30 additions and 5 deletions
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18
app/src/main/java/eu/kanade/presentation/components/VerticalFastScroller.kt
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@@ -42,9 +42,10 @@ import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.dp
import androidx.compose.ui.util.fastFirstOrNull
import androidx.compose.ui.util.fastForEach
import androidx.compose.ui.util.fastMaxBy
import eu.kanade.presentation.util.plus
import eu.kanade.presentation.components.Scroller.STICKY_HEADER_KEY_PREFIX
import kotlinx.coroutines.channels.BufferOverflow
import kotlinx.coroutines.flow.MutableSharedFlow
import kotlinx.coroutines.flow.collectLatest
@@ -53,6 +54,11 @@ import kotlin.math.max
import kotlin.math.min
import kotlin.math.roundToInt
/**
* Draws vertical fast scroller to a lazy list
*
* Set key with [STICKY_HEADER_KEY_PREFIX] prefix to any sticky header item in the list.
*/
@Composable
fun VerticalFastScroller(
listState: LazyListState,
@@ -386,7 +392,8 @@ private fun computeScrollRange(state: LazyGridState): Int {
private fun computeScrollOffset(state: LazyListState): Int {
if (state.layoutInfo.totalItemsCount == 0) return 0
val visibleItems = state.layoutInfo.visibleItemsInfo
val startChild = visibleItems.first()
val startChild = visibleItems
.fastFirstOrNull { (it.key as? String)?.startsWith(STICKY_HEADER_KEY_PREFIX)?.not() ?: true }!!
val endChild = visibleItems.last()
val minPosition = min(startChild.index, endChild.index)
val maxPosition = max(startChild.index, endChild.index)
@@ -401,13 +408,18 @@ private fun computeScrollOffset(state: LazyListState): Int {
private fun computeScrollRange(state: LazyListState): Int {
if (state.layoutInfo.totalItemsCount == 0) return 0
val visibleItems = state.layoutInfo.visibleItemsInfo
val startChild = visibleItems.first()
val startChild = visibleItems
.fastFirstOrNull { (it.key as? String)?.startsWith(STICKY_HEADER_KEY_PREFIX)?.not() ?: true }!!
val endChild = visibleItems.last()
val laidOutArea = endChild.bottom - startChild.top
val laidOutRange = abs(startChild.index - endChild.index) + 1
return (laidOutArea.toFloat() / laidOutRange * state.layoutInfo.totalItemsCount).roundToInt()
}
object Scroller {
const val STICKY_HEADER_KEY_PREFIX = "sticky:"
}
private val ThumbLength = 48.dp
private val ThumbThickness = 8.dp
private val ThumbShape = RoundedCornerShape(ThumbThickness / 2)