ui: float the offline indicator opposite the library FAB

Drop the strip above the tab bar, which kept the bottom of the library
busy, and go back to a floating tonal cloud-off button at the bottom
start, level with the FAB on the other side. Tapping it still leaves
offline mode, and the tab bar goes back to just tabs and the gear.

app/src/main/kotlin/com/subtracks/ui/library/LibraryScreen.kt

@@ -17,7 +17,6 @@ import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.layout.heightIn
 import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
@@ -46,6 +45,7 @@ import androidx.compose.material.icons.rounded.Search
 import androidx.compose.material.icons.rounded.Settings
 import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.FilledTonalIconButton
 import androidx.compose.material3.FilterChip
 import androidx.compose.material3.FilterChipDefaults
 import androidx.compose.material3.FloatingActionButton
@@ -90,7 +90,6 @@ import androidx.compose.ui.graphics.StrokeCap
 import androidx.compose.ui.graphics.drawscope.clipPath
 import androidx.compose.ui.graphics.drawscope.clipRect
 import androidx.compose.ui.graphics.graphicsLayer
-import androidx.compose.ui.graphics.lerp
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.layout.boundsInParent
 import androidx.compose.ui.layout.layout
@@ -100,7 +99,6 @@ import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.platform.LocalLayoutDirection
 import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.semantics.Role
 import androidx.compose.ui.semantics.clearAndSetSemantics
 import androidx.compose.ui.semantics.contentDescription
 import androidx.compose.ui.semantics.semantics
@@ -593,9 +591,6 @@ fun LibraryScreen(
                         .onSizeChanged { tabBarHeightPx = it.height.toFloat() }
                         .padding(bottom = bottomInset),
             ) {
-                if (offline) {
-                    OfflineStrip(onGoOnline = onExitOffline, headerColor = headerColor)
-                }
                 LibraryTabs(
                     pagerState = pagerState,
                     onTabSelected = { tab ->
@@ -623,6 +618,20 @@ fun LibraryScreen(
         }
 
         if (!searchActive) {
+            if (offline) {
+                FilledTonalIconButton(
+                    onClick = onExitOffline,
+                    modifier =
+                        Modifier
+                            .align(Alignment.BottomStart)
+                            .padding(start = 16.dp, bottom = tabBarHeight + 16.dp),
+                ) {
+                    Icon(
+                        imageVector = Icons.Rounded.CloudOff,
+                        contentDescription = stringResource(R.string.offline_mode_status),
+                    )
+                }
+            }
             val searchFab = selectedTab == LibraryTab.Home
             FloatingActionButton(
                 onClick = { if (searchFab) onOpenSearch() else showOptions = true },
@@ -837,7 +846,6 @@ private val TAB_ICON_SIZE = 24.dp
 private val TAB_VERTICAL_PADDING = 6.dp
 private val TOUCH_TARGET = 48.dp
 private const val LIST_OPTIONS_WEIGHT = 0.11f
-private const val OFFLINE_STRIP_TINT = 0.10f
 private val LIST_OPTIONS_BAR_WIDTHS = listOf(1f, 0.62f, 0.34f)
 
 @Composable
@@ -1015,44 +1023,6 @@ internal fun LibraryTabs(
     }
 }
 
-@Composable
-private fun OfflineStrip(
-    onGoOnline: () -> Unit,
-    headerColor: Color,
-    modifier: Modifier = Modifier,
-) {
-    Row(
-        modifier =
-            modifier
-                .fillMaxWidth()
-                .background(lerp(headerColor, MaterialTheme.colorScheme.primary, OFFLINE_STRIP_TINT))
-                .heightIn(min = 48.dp)
-                .clickable(role = Role.Button, onClick = onGoOnline)
-                .padding(horizontal = 16.dp, vertical = 8.dp),
-        verticalAlignment = Alignment.CenterVertically,
-        horizontalArrangement = Arrangement.spacedBy(8.dp),
-    ) {
-        Icon(
-            imageVector = Icons.Rounded.CloudOff,
-            contentDescription = null,
-            tint = MaterialTheme.colorScheme.primary,
-            modifier = Modifier.size(18.dp),
-        )
-        Text(
-            text = stringResource(R.string.offline_mode_banner),
-            style = MaterialTheme.typography.bodyMedium,
-            color = MaterialTheme.colorScheme.onBackground,
-            maxLines = 2,
-            modifier = Modifier.weight(1f),
-        )
-        Text(
-            text = stringResource(R.string.offline_go_online),
-            style = MaterialTheme.typography.labelLarge,
-            color = MaterialTheme.colorScheme.primary,
-        )
-    }
-}
-
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 private fun TabButton(

app/src/main/res/values/strings.xml

@@ -175,8 +175,7 @@
     <string name="filters">Filters</string>
     <string name="filter_downloaded">Downloaded</string>
     <string name="close_search">Close search</string>
-    <string name="offline_mode_banner">Offline mode</string>
-    <string name="offline_go_online">Go online</string>
+    <string name="offline_mode_status">Offline mode; tap to go online</string>
     <string name="shuffle_artist">Shuffle artist</string>
 
     <string name="status_playing">Playing</string>

app/src/test/kotlin/com/subtracks/ui/LibraryScreenTest.kt

@@ -510,7 +510,7 @@ class LibraryScreenTest {
 
     @Test
     @Config(qualifiers = "de-rDE-w320dp-h640dp-xhdpi")
-    fun theOfflineStripExplainsTheModeAndGoesOnline() {
+    fun theOfflineIndicatorGoesOnline() {
         var exited = false
         composeRule.setContent {
             SubtracksTheme {
@@ -533,11 +533,10 @@ class LibraryScreenTest {
         }
         composeRule.waitForIdle()
 
-        composeRule.onNodeWithText(composeRule.activity.getString(R.string.offline_mode_banner)).performClick()
-        assertTrue("the offline strip should leave offline mode", exited)
         composeRule
-            .onNodeWithContentDescription(composeRule.activity.getString(R.string.navigation_tabs_settings))
-            .assertWidthIsEqualTo(40.dp)
+            .onNodeWithContentDescription(composeRule.activity.getString(R.string.offline_mode_status))
+            .performClick()
+        assertTrue("the offline indicator should leave offline mode", exited)
     }
 
     private fun tabBounds(tab: LibraryTab) =