Fix username link sharing toolbar.

app/src/main/java/org/thoughtcrime/securesms/components/settings/app/usernamelinks/main/UsernameLinkSettingsFragment.kt

@@ -1,3 +1,5 @@
+@file:OptIn(ExperimentalMaterial3Api::class)
+
 package org.thoughtcrime.securesms.components.settings.app.usernamelinks.main
 
 import android.content.Intent
@@ -9,21 +11,24 @@ import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.slideInHorizontally
 import androidx.compose.animation.slideOutHorizontally
 import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.defaultMinSize
-import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.CenterAlignedTopAppBar
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.SnackbarHost
 import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.material3.TopAppBarScrollBehavior
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -32,6 +37,8 @@ import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.nestedscroll.nestedScroll
+import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
@@ -41,6 +48,7 @@ import androidx.navigation.NavController
 import androidx.navigation.fragment.findNavController
 import com.google.accompanist.permissions.ExperimentalPermissionsApi
 import com.google.accompanist.permissions.PermissionState
+import com.google.accompanist.permissions.PermissionStatus
 import com.google.accompanist.permissions.isGranted
 import com.google.accompanist.permissions.rememberPermissionState
 import kotlinx.coroutines.CoroutineScope
@@ -65,6 +73,7 @@ class UsernameLinkSettingsFragment : ComposeFragment() {
 
   private val screenshotController = ScreenshotController()
 
+  @OptIn(ExperimentalMaterial3Api::class)
   @Composable
   override fun FragmentContent() {
     val state by viewModel.state
@@ -72,10 +81,21 @@ class UsernameLinkSettingsFragment : ComposeFragment() {
     val scope: CoroutineScope = rememberCoroutineScope()
     val navController: NavController by remember { mutableStateOf(findNavController()) }
     var showResetDialog: Boolean by remember { mutableStateOf(false) }
+    val scrollBehavior = TopAppBarDefaults.pinnedScrollBehavior()
+    val cameraPermissionState: PermissionState = rememberPermissionState(permission = android.Manifest.permission.CAMERA)
 
     Scaffold(
       snackbarHost = { SnackbarHost(hostState = snackbarHostState) },
-      topBar = { TopAppBarContent(state.activeTab) }
+      topBar = {
+        TopAppBarContent(
+          activeTab = state.activeTab,
+          scrollBehavior = scrollBehavior,
+          onCodeTabSelected = { viewModel.onTabSelected(ActiveTab.Code) },
+          onScanTabSelected = { viewModel.onTabSelected(ActiveTab.Scan) },
+          cameraPermissionState = cameraPermissionState
+        )
+      },
+      modifier = Modifier.nestedScroll(scrollBehavior.nestedScrollConnection)
     ) { contentPadding ->
 
       if (state.indeterminateProgress) {
@@ -138,41 +158,57 @@ class UsernameLinkSettingsFragment : ComposeFragment() {
     viewModel.onResume()
   }
 
+  @OptIn(ExperimentalMaterial3Api::class)
   @Composable
-  private fun TopAppBarContent(activeTab: ActiveTab) {
-    val cameraPermissionState: PermissionState = rememberPermissionState(permission = android.Manifest.permission.CAMERA)
-
-    Box(
+  private fun TopAppBarContent(
+    activeTab: ActiveTab,
+    scrollBehavior: TopAppBarScrollBehavior = TopAppBarDefaults.pinnedScrollBehavior(),
+    onCodeTabSelected: () -> Unit = {},
+    onScanTabSelected: () -> Unit = {},
+    cameraPermissionState: PermissionState = previewPermissionState()
+  ) {
+    CenterAlignedTopAppBar(
       modifier = Modifier
-        .fillMaxWidth()
-        .height(64.dp)
-    ) {
-      Row(
-        modifier = Modifier
-          .fillMaxWidth()
-          .fillMaxHeight(),
-        horizontalArrangement = Arrangement.Center,
-        verticalAlignment = Alignment.CenterVertically
-      ) {
-        TabButton(
-          label = stringResource(R.string.UsernameLinkSettings_code_tab_name),
-          active = activeTab == ActiveTab.Code,
-          onClick = { viewModel.onTabSelected(ActiveTab.Code) },
-          modifier = Modifier.padding(end = 8.dp)
-        )
-        TabButton(
-          label = stringResource(R.string.UsernameLinkSettings_scan_tab_name),
-          active = activeTab == ActiveTab.Scan,
-          onClick = {
-            if (cameraPermissionState.status.isGranted) {
-              viewModel.onTabSelected(ActiveTab.Scan)
-            } else {
-              cameraPermissionState.launchPermissionRequest()
-            }
-          }
-        )
-      }
-    }
+        .fillMaxWidth(),
+      title = {
+        Row(
+          modifier = Modifier
+            .fillMaxWidth(),
+          horizontalArrangement = Arrangement.Center,
+          verticalAlignment = Alignment.CenterVertically
+        ) {
+          TabButton(
+            label = stringResource(R.string.UsernameLinkSettings_code_tab_name),
+            active = activeTab == ActiveTab.Code,
+            onClick = onCodeTabSelected,
+            modifier = Modifier.padding(end = 8.dp)
+          )
+          TabButton(
+            label = stringResource(R.string.UsernameLinkSettings_scan_tab_name),
+            active = activeTab == ActiveTab.Scan,
+            onClick = {
+              if (cameraPermissionState.status.isGranted) {
+                onScanTabSelected()
+              } else {
+                cameraPermissionState.launchPermissionRequest()
+              }
+            },
+            modifier = Modifier.padding(end = 8.dp)
+          )
+        }
+      },
+      navigationIcon = {
+        IconButton(
+          onClick = { requireActivity().onNavigateUp() }
+        ) {
+          Icon(
+            painter = painterResource(R.drawable.symbol_x_24),
+            contentDescription = stringResource(android.R.string.cancel)
+          )
+        }
+      },
+      scrollBehavior = scrollBehavior
+    )
   }
 
   @Composable
@@ -185,7 +221,7 @@ class UsernameLinkSettingsFragment : ComposeFragment() {
         contentColor = MaterialTheme.colorScheme.onSurface
       )
     }
-    Buttons.MediumTonal(
+    Buttons.Small(
       onClick = onClick,
       modifier = modifier.defaultMinSize(minWidth = 100.dp),
       shape = RoundedCornerShape(12.dp),
@@ -234,6 +270,14 @@ class UsernameLinkSettingsFragment : ComposeFragment() {
     }
   }
 
+  private fun previewPermissionState(): PermissionState {
+    return object : PermissionState {
+      override val permission: String = ""
+      override val status: PermissionStatus = PermissionStatus.Granted
+      override fun launchPermissionRequest() = Unit
+    }
+  }
+
   private fun shareQrBadge(badge: Bitmap) {
     try {
       ByteArrayOutputStream().use { byteArrayOutputStream ->