Adds code for custom rotary (#714)

Author: kul3r4

wear/src/main/java/com/example/wear/snippets/m3/rotary/Rotary.kt

@@ -29,9 +29,11 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.State
 import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
@@ -42,8 +44,11 @@ import androidx.compose.ui.focus.focusRequester
 import androidx.compose.ui.input.pointer.pointerInteropFilter
 import androidx.compose.ui.input.rotary.onRotaryScrollEvent
 import androidx.compose.ui.unit.dp
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.wear.compose.foundation.lazy.ScalingLazyColumn
 import androidx.wear.compose.foundation.lazy.ScalingLazyColumnDefaults
+import androidx.wear.compose.foundation.lazy.TransformingLazyColumn
 import androidx.wear.compose.foundation.lazy.rememberScalingLazyListState
 import androidx.wear.compose.foundation.lazy.rememberTransformingLazyColumnState
 import androidx.wear.compose.material3.Button
@@ -57,6 +62,7 @@ import androidx.wear.compose.material3.Text
 import androidx.wear.compose.material3.rememberPickerState
 import androidx.wear.compose.ui.tooling.preview.WearPreviewDevices
 import androidx.wear.compose.ui.tooling.preview.WearPreviewFontScales
+import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.launch
 
 @Composable
@@ -105,7 +111,8 @@ fun TimePicker() {
             // [END_EXCLUDE]
             Picker(
                 readOnly = selectedColumn != 0,
-                modifier = Modifier.size(64.dp, 100.dp)
+                modifier = Modifier
+                    .size(64.dp, 100.dp)
                     .onRotaryScrollEvent {
                         coroutineScope.launch {
                             hourState.scrollBy(it.verticalScrollPixels)
@@ -134,7 +141,8 @@ fun TimePicker() {
             // [END_EXCLUDE]
             Picker(
                 readOnly = selectedColumn != 1,
-                modifier = Modifier.size(64.dp, 100.dp)
+                modifier = Modifier
+                    .size(64.dp, 100.dp)
                     .onRotaryScrollEvent {
                         coroutineScope.launch {
                             minuteState.scrollBy(it.verticalScrollPixels)
@@ -213,6 +221,59 @@ fun PositionScrollIndicator() {
     // [END android_wear_rotary_position_indicator]
 }
 
+@Composable
+fun VolumeScreen() {
+    // [START android_wear_rotary_custom_ui]
+    val focusRequester: FocusRequester = remember { FocusRequester() }
+    val volumeViewModel: VolumeViewModel.MyViewModel =
+        viewModel()
+    val volumeState by volumeViewModel.volumeState
+
+    TransformingLazyColumn(
+        modifier = Modifier
+            .fillMaxSize()
+            .onRotaryScrollEvent {
+                volumeViewModel.onVolumeChangeByScroll(it.verticalScrollPixels)
+                true
+            }
+            .focusRequester(focusRequester)
+            .focusable(),
+    ) {
+        // You can use volumeState here, for example:
+        item {
+            Text("Volume: $volumeState")
+        }
+    }
+    // [END android_wear_rotary_custom_ui]
+}
+
+// [START android_wear_rotary_custom_model]
+class VolumeRange(
+    val max: Int = 10,
+    val min: Int = 0
+)
+
+private object VolumeViewModel {
+    class MyViewModel : ViewModel() {
+        private val _volumeState = mutableIntStateOf(0)
+        val volumeState: State<Int>
+            get() = _volumeState
+
+        // ...
+        fun onVolumeChangeByScroll(pixels: Float) {
+            _volumeState.value = when {
+                pixels > 0 -> minOf(volumeState.value + 1, VolumeRange().max)
+                pixels < 0 -> maxOf(volumeState.value - 1, VolumeRange().min)
+                else -> volumeState.value
+            }
+        }
+    }
+}
+// [END android_wear_rotary_custom_model]
+
+
+
+
 @WearPreviewDevices
 @WearPreviewFontScales
 @Composable