[CredManUi] Style fixes

1. System bar colors to the spec described in the bug
2. Scrim color to lighter

Bug: 271478093
Test: manual (see bug for screenshot)
Change-Id: I424378881481909f4ae103cf518ce48e91806e20

packages/CredentialManager/Android.bp

@@ -20,6 +20,7 @@ android_app {
     },
 
     static_libs: [
+        "PlatformComposeCore",
         "androidx.activity_activity-compose",
         "androidx.appcompat_appcompat",
         "androidx.compose.animation_animation-core",

packages/CredentialManager/res/values/themes.xml

@@ -5,7 +5,5 @@
     <item name="android:windowNoTitle">true</item>
     <item name="android:windowBackground">@android:color/transparent</item>
     <item name="android:windowIsTranslucent">true</item>
-    <item name="android:statusBarColor">@android:color/transparent</item>
-    <item name="android:navigationBarColor">@android:color/transparent</item>
   </style>
 </resources>

packages/CredentialManager/src/com/android/credentialmanager/common/material/ModalBottomSheet.kt

@@ -306,10 +306,6 @@ fun rememberModalBottomSheetState(
  * @param sheetContentColor The preferred content color provided by the bottom sheet to its
  * children. Defaults to the matching content color for [sheetBackgroundColor], or if that is not
  * a color from the theme, this will keep the same content color set above the bottom sheet.
- * @param scrimColor The color of the scrim that is applied to the rest of the screen when the
- * bottom sheet is visible. If the color passed is [Color.Unspecified], then a scrim will no
- * longer be applied and the bottom sheet will not block interaction with the rest of the screen
- * when visible.
  * @param content The content of rest of the screen.
  */
 @Composable
@@ -322,7 +318,6 @@ fun ModalBottomSheetLayout(
     sheetElevation: Dp = ModalBottomSheetDefaults.Elevation,
     sheetBackgroundColor: Color = MaterialTheme.colorScheme.surface,
     sheetContentColor: Color = contentColorFor(sheetBackgroundColor),
-    scrimColor: Color = ModalBottomSheetDefaults.scrimColor,
     content: @Composable () -> Unit
 ) {
     val scope = rememberCoroutineScope()
@@ -332,7 +327,7 @@ fun ModalBottomSheetLayout(
         Box(Modifier.fillMaxSize()) {
             content()
             Scrim(
-                color = scrimColor,
+                color = ModalBottomSheetDefaults.scrimColor,
                 onDismiss = {
                     if (sheetState.confirmStateChange(Hidden)) {
                         scope.launch { sheetState.hide() }
@@ -505,5 +500,5 @@ object ModalBottomSheetDefaults {
      */
     val scrimColor: Color
         @Composable
-        get() = MaterialTheme.colorScheme.scrim
+        get() = MaterialTheme.colorScheme.scrim.copy(alpha = .32f)
 }

packages/CredentialManager/src/com/android/credentialmanager/common/ui/BottomSheet.kt

@@ -43,7 +43,6 @@ fun ModalBottomSheet(
         modifier = Modifier.background(Color.Transparent),
         sheetState = state,
         sheetContent = sheetContent,
-        scrimColor = MaterialTheme.colorScheme.scrim.copy(alpha = 0.8f),
         sheetShape = EntryShape.TopRoundedCorner,
     ) {}
     LaunchedEffect(state.currentValue) {

packages/CredentialManager/src/com/android/credentialmanager/common/ui/SystemUiControllerUtils.kt

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.credentialmanager.common.ui
+
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.graphics.Color
+import com.android.compose.SystemUiController
+import com.android.credentialmanager.common.material.ModalBottomSheetDefaults
+
+@Composable
+fun setTransparentSystemBarsColor(sysUiController: SystemUiController) {
+    sysUiController.setSystemBarsColor(color = Color.Transparent, darkIcons = false)
+}
+
+@Composable
+fun setBottomSheetSystemBarsColor(sysUiController: SystemUiController) {
+    sysUiController.setStatusBarColor(
+        color = ModalBottomSheetDefaults.scrimColor,
+        darkIcons = false
+    )
+    sysUiController.setNavigationBarColor(
+        color = MaterialTheme.colorScheme.surfaceColorAtElevation(
+            ElevationTokens.Level1
+        ),
+        darkIcons = false
+    )
+}

packages/CredentialManager/src/com/android/credentialmanager/createflow/CreateCredentialComponents.kt

@@ -31,6 +31,7 @@ import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import androidx.core.graphics.drawable.toBitmap
+import com.android.compose.rememberSystemUiController
 import com.android.credentialmanager.CredentialSelectorViewModel
 import com.android.credentialmanager.R
 import com.android.credentialmanager.common.BaseEntry
@@ -51,6 +52,7 @@ import com.android.credentialmanager.common.ui.MoreOptionTopAppBar
 import com.android.credentialmanager.common.ui.SheetContainerCard
 import com.android.credentialmanager.common.ui.PasskeyBenefitRow
 import com.android.credentialmanager.common.ui.HeadlineText
+import com.android.credentialmanager.common.ui.setBottomSheetSystemBarsColor
 
 @Composable
 fun CreateCredentialScreen(
@@ -58,6 +60,8 @@ fun CreateCredentialScreen(
     createCredentialUiState: CreateCredentialUiState,
     providerActivityLauncher: ManagedActivityResultLauncher<IntentSenderRequest, ActivityResult>
 ) {
+    val sysUiController = rememberSystemUiController()
+    setBottomSheetSystemBarsColor(sysUiController)
     ModalBottomSheet(
         sheetContent = {
             // Hide the sheet content as opposed to the whole bottom sheet to maintain the scrim

packages/CredentialManager/src/com/android/credentialmanager/getflow/GetCredentialComponents.kt

@@ -39,6 +39,7 @@ import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import androidx.core.graphics.drawable.toBitmap
+import com.android.compose.rememberSystemUiController
 import com.android.credentialmanager.CredentialSelectorViewModel
 import com.android.credentialmanager.R
 import com.android.credentialmanager.common.BaseEntry
@@ -57,6 +58,8 @@ import com.android.credentialmanager.common.ui.SnackbarActionText
 import com.android.credentialmanager.common.ui.HeadlineText
 import com.android.credentialmanager.common.ui.CredentialListSectionHeader
 import com.android.credentialmanager.common.ui.Snackbar
+import com.android.credentialmanager.common.ui.setTransparentSystemBarsColor
+import com.android.credentialmanager.common.ui.setBottomSheetSystemBarsColor
 
 @Composable
 fun GetCredentialScreen(
@@ -64,13 +67,16 @@ fun GetCredentialScreen(
     getCredentialUiState: GetCredentialUiState,
     providerActivityLauncher: ManagedActivityResultLauncher<IntentSenderRequest, ActivityResult>
 ) {
+    val sysUiController = rememberSystemUiController()
     if (getCredentialUiState.currentScreenState == GetScreenState.REMOTE_ONLY) {
+        setTransparentSystemBarsColor(sysUiController)
         RemoteCredentialSnackBarScreen(
             onClick = viewModel::getFlowOnMoreOptionOnSnackBarSelected,
             onCancel = viewModel::onUserCancel,
         )
     } else if (getCredentialUiState.currentScreenState
         == GetScreenState.UNLOCKED_AUTH_ENTRIES_ONLY) {
+        setTransparentSystemBarsColor(sysUiController)
         EmptyAuthEntrySnackBarScreen(
             authenticationEntryList =
             getCredentialUiState.providerDisplayInfo.authenticationEntryList,
@@ -78,6 +84,7 @@ fun GetCredentialScreen(
             onLastLockedAuthEntryNotFound = viewModel::onLastLockedAuthEntryNotFoundError,
         )
     } else {
+        setBottomSheetSystemBarsColor(sysUiController)
         ModalBottomSheet(
             sheetContent = {
                 // Hide the sheet content as opposed to the whole bottom sheet to maintain the scrim