Release /v1.3.7

Release /v1.3.7

app/build.gradle.kts

@@ -17,8 +17,8 @@ android {
         minSdk = libs.versions.minSdk.get().toInt()
         targetSdk = libs.versions.targetSdk.get().toInt()
 
-        versionCode = 15
-        versionName = "1.3.6"
+        versionCode = 16
+        versionName = "1.3.7"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }

core/design-system/src/main/java/team/aliens/dms/android/core/designsystem/Picker.kt

@@ -0,0 +1,115 @@
+package team.aliens.dms.android.core.designsystem
+
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.gestures.snapping.rememberSnapFlingBehavior
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.material3.LocalContentColor
+import androidx.compose.material3.LocalTextStyle
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.snapshotFlow
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.drawWithContent
+import androidx.compose.ui.graphics.BlendMode
+import androidx.compose.ui.graphics.Brush
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.CompositingStrategy
+import androidx.compose.ui.graphics.graphicsLayer
+import androidx.compose.ui.layout.onSizeChanged
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.style.TextOverflow
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.map
+
+@OptIn(ExperimentalFoundationApi::class)
+@Composable
+fun Picker(
+    items: List<String>,
+    state: PickerState = rememberPickerState(),
+    modifier: Modifier = Modifier,
+    startIndex: Int  = 0,
+    visibleItemsCount: Int = 3,
+    textModifier: Modifier = Modifier,
+    textStyle: TextStyle = LocalTextStyle.current,
+) {
+    val visibleItemsMiddle = visibleItemsCount / 2
+    val listScrollCount = Integer.MAX_VALUE
+    val listScrollMiddle = listScrollCount / 2
+    val listStartIndex = listScrollMiddle - listScrollMiddle % items.size - visibleItemsMiddle + startIndex
+
+    fun getItem(index: Int) = items[index % items.size]
+
+    val listState = rememberLazyListState(initialFirstVisibleItemIndex = listStartIndex)
+    val flingBehavior = rememberSnapFlingBehavior(lazyListState = listState)
+
+    val itemHeightPixels = remember { mutableIntStateOf(0) }
+    val itemHeightDp = pixelsToDp(itemHeightPixels.value)
+
+    val fadingEdgeGradient = remember {
+        Brush.verticalGradient(
+            0f to Color.Transparent,
+            0.5f to Color.Black,
+            1f to Color.Transparent
+        )
+    }
+
+    LaunchedEffect(listState) {
+        snapshotFlow { listState.firstVisibleItemIndex }
+            .map { index -> getItem(index + visibleItemsMiddle) }
+            .distinctUntilChanged()
+            .collect { item -> state.selectedItem = item }
+    }
+
+    Box(modifier = modifier) {
+        LazyColumn(
+            state = listState,
+            flingBehavior = flingBehavior,
+            horizontalAlignment = Alignment.CenterHorizontally,
+            modifier = Modifier
+                .fillMaxWidth()
+                .height(itemHeightDp * visibleItemsCount)
+                .fadingEdge(fadingEdgeGradient)
+        ) {
+            items(listScrollCount) { index ->
+                Text(
+                    text = getItem(index),
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis,
+                    style = textStyle,
+                    modifier = Modifier
+                        .onSizeChanged { size -> itemHeightPixels.value = size.height }
+                        .then(textModifier)
+                )
+            }
+        }
+    }
+}
+
+private fun Modifier.fadingEdge(brush: Brush) = this
+    .graphicsLayer(compositingStrategy = CompositingStrategy.Offscreen)
+    .drawWithContent {
+        drawContent()
+        drawRect(brush = brush, blendMode = BlendMode.DstIn)
+    }
+
+@Composable
+private fun pixelsToDp(pixels: Int) = with(LocalDensity.current) { pixels.toDp() }
+
+@Composable
+fun rememberPickerState() = remember { PickerState() }
+
+class PickerState {
+    var selectedItem by mutableStateOf("")
+}