Scroll to top when selecting another stanza

composeApp/src/commonMain/kotlin/mg/dot/feufaro/ScreenSolfa.kt

@@ -13,6 +13,7 @@ import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.safeDrawing
 import androidx.compose.foundation.layout.windowInsetsPadding
+import androidx.compose.foundation.lazy.grid.rememberLazyGridState
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.Text
@@ -21,6 +22,7 @@ import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
@@ -37,6 +39,7 @@ import mg.dot.feufaro.solfa.LazyVerticalGridTUO
 import kotlin.math.roundToInt
 import cafe.adriel.voyager.core.screen.Screen
 import cafe.adriel.voyager.koin.koinScreenModel
+import kotlinx.coroutines.launch
 import mg.dot.feufaro.data.GridTUOData
 import mg.dot.feufaro.viewmodel.SolfaScreenModel
 import java.io.ObjectStreamException
@@ -53,6 +56,8 @@ object ScreenSolfa : Screen {
         val measure by sharedScreenModel.measure.collectAsState()
         val stanza by sharedScreenModel.stanza.collectAsState()
         val gridTUOData = GridTUOData(measure, tuoList, stanza)
+        val lazyGridState = rememberLazyGridState()
+        val coroutineScope = rememberCoroutineScope()
         Column(
             Modifier.fillMaxSize()
                 .pointerInput(Unit) {
@@ -66,6 +71,7 @@ object ScreenSolfa : Screen {
                 },
             horizontalAlignment = Alignment.CenterHorizontally,
         ) {
+            val columnScrollState = rememberScrollState()
             if (showContextualMenu) {
                 Popup(
                     alignment = Alignment.TopStart,
@@ -85,7 +91,7 @@ object ScreenSolfa : Screen {
                 modifier = Modifier
                     .fillMaxWidth()
                     .weight(1f)
-                    .verticalScroll(rememberScrollState())
+                    .verticalScroll(columnScrollState)
             ) {
                 FlowRow(
                     modifier = Modifier.fillMaxWidth()
@@ -104,11 +110,13 @@ object ScreenSolfa : Screen {
                             .padding(horizontal = 4.dp)
                     )
                     Text(text = measureString)
+                    Text(text = "Stanza: $stanza")
                 }
                 LazyVerticalGridTUO(
                     gridTUOData,
                     gridWidthPx = gridWidthPx,
-                    onGridWidthMeasured = { width -> gridWidthPx = width }
+                    onGridWidthMeasured = { width -> gridWidthPx = width },
+                    lazyGridState = lazyGridState
                 )
                 MGButton(onClick = {
                     //showContent = !showContent
@@ -131,13 +139,16 @@ object ScreenSolfa : Screen {
                             enabled = (i != stanza.toInt()),
                             onClick = {
                                 sharedScreenModel.setStanza(i)
+                                coroutineScope.launch {
+                                    lazyGridState.animateScrollToItem(0)
+                                    columnScrollState.animateScrollTo(0)
+                                }
                             },
                             modifier = Modifier.padding(horizontal = 4.dp)
                         ) {
                             Text("$i")
                         }
                     }
-                    Text(text = "Stanza: $stanza")
                     val songAuthor: String by sharedScreenModel.songAuthor.collectAsState()
                     val songComposer: String by sharedScreenModel.songComposer.collectAsState()
                     val songRhythm: String by sharedScreenModel.songRhythm.collectAsState()

composeApp/src/commonMain/kotlin/mg/dot/feufaro/solfa/TimeUnitObject.kt

@@ -4,6 +4,7 @@ import androidx.compose.foundation.background
 import androidx.compose.runtime.Composable
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.grid.GridCells
+import androidx.compose.foundation.lazy.grid.LazyGridState
 import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
 import androidx.compose.foundation.lazy.grid.items
 import androidx.compose.ui.Modifier
@@ -334,7 +335,8 @@ fun LazyVerticalGridTUO(
     viewModel: GridTUOData,
     gridWidthPx: Int,
     onGridWidthMeasured: (Int) -> Unit,
-    modifier: Modifier = Modifier
+    modifier: Modifier = Modifier,
+    lazyGridState: LazyGridState
 ) {
     val regexMeasure = Regex("(\\d)/\\d").find(viewModel.measure)
     val tuoList  = viewModel.tuoList
@@ -373,7 +375,8 @@ fun LazyVerticalGridTUO(
 
             horizontalArrangement = Arrangement.spacedBy(horizontalArrangementSpacing),
             verticalArrangement = Arrangement.spacedBy(8.dp),
-            contentPadding = PaddingValues(8.dp) // c'est juste le padding exterieur de toute la liste
+            contentPadding = PaddingValues(8.dp), // c'est juste le padding exterieur de toute la liste
+            state = lazyGridState
         ) {
             items(items = tuoList.drop(1), key = { it.numBlock }) { oneTUO ->
                 TimeUnitComposable(