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Fix: scrolling button not scroll to first/last item #335

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Fix: scrolling button not scroll to first/last item #335

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13 changes: 4 additions & 9 deletions zeapp/android/src/main/java/de/berlindroid/zeapp/zeui/ZeFloatingScroller.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -19,25 +19,20 @@ import androidx.compose.material3.Text as ZeText

@Composable
fun ZeFloatingScroller(
coroutineScope: CoroutineScope,
lazyListState: LazyListState,
scrollLength: Float,
modifier: Modifier = Modifier,
text: String,
onClick: () -> Unit,
) {
FloatingActionButton(
containerColor = ZeBlack,
modifier = Modifier
modifier = modifier
.padding(16.dp)
.border(
width = 1.dp,
color = ZeWhite,
shape = RoundedCornerShape(16.dp),
),
onClick = {
coroutineScope.launch {
lazyListState.animateScrollBy(scrollLength)
}
},
onClick = onClick,
) {
ZeText(
text = text,
Expand Down
13 changes: 7 additions & 6 deletions zeapp/android/src/main/java/de/berlindroid/zeapp/zeui/ZeNavigationPad.kt
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Original file line number Diff line number Diff line change
@@ -1,10 +1,8 @@
package de.berlindroid.zeapp.zeui

import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.lazy.LazyListState
import androidx.compose.runtime.Composable
import androidx.compose.runtime.derivedStateOf
Expand All @@ -14,13 +12,13 @@ import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import kotlinx.coroutines.launch

@Composable
fun ZeNavigationPad(
lazyListState: LazyListState,
) {
val coroutineScope = rememberCoroutineScope()
val scrollLength = 425f
val topReached by remember { derivedStateOf { lazyListState.layoutInfo.visibleItemsInfo.firstOrNull()?.offset == 0 } }
val bottomReached by remember {
derivedStateOf {
Expand All @@ -36,11 +34,14 @@ fun ZeNavigationPad(
horizontalAlignment = Alignment.End,
) {
if (!topReached) {
ZeFloatingScroller(coroutineScope, lazyListState, -scrollLength, "↑")
ZeFloatingScroller(text = "↑") {
coroutineScope.launch { lazyListState.animateScrollToItem(0) }
}
}
Spacer(modifier = Modifier.size(10.dp))
if (!bottomReached) {
ZeFloatingScroller(coroutineScope, lazyListState, scrollLength, "↓")
ZeFloatingScroller(text = "↓") {
coroutineScope.launch { lazyListState.animateScrollToItem(lazyListState.layoutInfo.totalItemsCount - 1) }
}
}
}
}