Update usage of Pages.

Change-Id: I5a9421041d497c83a12585ab429f847e441e4c92

app/src/main/java/com/google/samples/apps/sunflower/compose/home/HomeScreen.kt

@@ -71,9 +71,10 @@ enum class SunflowerPage(
 fun HomeScreen(
     modifier: Modifier = Modifier,
     onPlantClick: (Plant) -> Unit = {},
-    viewModel: PlantListViewModel = hiltViewModel()
+    viewModel: PlantListViewModel = hiltViewModel(),
+    pages: Array<SunflowerPage> = SunflowerPage.values()
 ) {
-    val pagerState = rememberPagerState()
+    val pagerState = rememberPagerState(pageCount = { pages.size })
     val scrollBehavior = TopAppBarDefaults.enterAlwaysScrollBehavior()
 
     Scaffold(
@@ -89,6 +90,7 @@ fun HomeScreen(
         HomePagerScreen(
             onPlantClick = onPlantClick,
             pagerState = pagerState,
+            pages = pages,
             Modifier.padding(top = contentPadding.calculateTopPadding())
         )
     }
@@ -99,8 +101,8 @@ fun HomeScreen(
 fun HomePagerScreen(
     onPlantClick: (Plant) -> Unit,
     pagerState: PagerState,
+    pages: Array<SunflowerPage>,
     modifier: Modifier = Modifier,
-    pages: Array<SunflowerPage> = SunflowerPage.values()
 ) {
     Column(modifier) {
         val coroutineScope = rememberCoroutineScope()
@@ -129,7 +131,6 @@ fun HomePagerScreen(
         // Pages
         HorizontalPager(
             modifier = Modifier.background(MaterialTheme.colorScheme.background),
-            pageCount = pages.size,
             state = pagerState,
             verticalAlignment = Alignment.Top
         ) { index ->
@@ -200,9 +201,11 @@ private fun HomeTopAppBar(
 @Composable
 private fun HomeScreenPreview() {
     SunflowerTheme {
+        val pages = SunflowerPage.values()
         HomePagerScreen(
             onPlantClick = {},
-            pagerState = PagerState(),
+            pagerState = rememberPagerState(pageCount = { pages.size }),
+            pages = pages
         )
     }
 }