Add status emoji badge to current user avatar in home top bar

features/home/impl/src/main/kotlin/io/element/android/features/home/impl/components/HomeTopBar.kt

@@ -8,6 +8,8 @@
 
 package io.element.android.features.home.impl.components
 
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.RowScope
@@ -15,9 +17,11 @@ import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.WindowInsetsSides
 import androidx.compose.foundation.layout.asPaddingValues
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.only
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.safeDrawing
+import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.statusBarsPadding
 import androidx.compose.foundation.pager.VerticalPager
 import androidx.compose.foundation.pager.rememberPagerState
@@ -25,8 +29,11 @@ import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.IconButtonDefaults
 import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.material3.TopAppBarScrollBehavior
+import androidx.compose.material3.minimumInteractiveComponentSize
 import androidx.compose.material3.rememberTopAppBarState
+import androidx.compose.material3.ripple
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
@@ -37,10 +44,20 @@ import androidx.compose.runtime.setValue
 import androidx.compose.runtime.snapshotFlow
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.drawWithContent
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.graphics.BlendMode
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.CompositingStrategy
+import androidx.compose.ui.graphics.graphicsLayer
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.platform.LocalLayoutDirection
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.heading
 import androidx.compose.ui.semantics.semantics
+import androidx.compose.ui.unit.Density
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.LayoutDirection
 import androidx.compose.ui.unit.dp
 import io.element.android.appconfig.RoomListConfig
 import io.element.android.compound.theme.ElementTheme
@@ -71,10 +88,13 @@ import io.element.android.libraries.designsystem.theme.components.IconButton
 import io.element.android.libraries.designsystem.theme.components.Text
 import io.element.android.libraries.designsystem.theme.components.TopAppBar
 import io.element.android.libraries.matrix.api.core.SessionId
+import io.element.android.libraries.matrix.api.user.DisplayedStatus
 import io.element.android.libraries.matrix.api.user.MatrixUser
+import io.element.android.libraries.matrix.api.user.UserStatus
 import io.element.android.libraries.matrix.ui.components.aMatrixUser
 import io.element.android.libraries.matrix.ui.components.aMatrixUserList
 import io.element.android.libraries.matrix.ui.model.getAvatarData
+import io.element.android.libraries.matrix.ui.model.toEmojiText
 import io.element.android.libraries.testtags.TestTags
 import io.element.android.libraries.testtags.testTag
 import io.element.android.libraries.ui.strings.CommonStrings
@@ -151,7 +171,7 @@ fun HomeTopBar(
             },
             // We want a 16dp left padding for the navigationIcon :
             // 4dp from default TopAppBarHorizontalPadding
-            // 8dp from AccountIcon default padding (because of IconButton)
+            // 8dp from AccountIcon default padding (48dp touch target around 32dp avatar)
             // 4dp extra padding using left insets
             windowInsets = WindowInsets(left = 4.dp),
         )
@@ -316,19 +336,36 @@ private fun AccountIcon(
     modifier: Modifier = Modifier,
 ) {
     val testTag = if (isCurrentAccount) Modifier.testTag(TestTags.homeScreenSettings) else Modifier
-    IconButton(
-        modifier = modifier.then(testTag),
-        onClick = onClick,
+    val interactionSource = remember { MutableInteractionSource() }
+    Box(
+        modifier = modifier
+            .then(testTag)
+            .minimumInteractiveComponentSize()
+            .clickable(
+                interactionSource = interactionSource,
+                onClick = onClick,
+                indication = ripple(bounded = false),
+            ),
+        contentAlignment = Alignment.Center,
     ) {
-        Box {
             val avatarData by remember(matrixUser) {
                 derivedStateOf {
                     matrixUser.getAvatarData(size = AvatarSize.CurrentUserTopBar)
                 }
             }
+            val statusEmoji = matrixUser.displayedStatus?.toEmojiText()
+            val avatarModifier = if (statusEmoji != null) {
+                Modifier.eraseStatusEmojiBackground(
+                    parentSize = AvatarSize.CurrentUserTopBar.dp,
+                    layoutDirection = LocalLayoutDirection.current,
+                )
+            } else {
+                Modifier
+            }
             Avatar(
                 avatarData = avatarData,
                 avatarType = AvatarType.User,
+                modifier = avatarModifier,
                 contentDescription = if (isCurrentAccount) {
                     if (showAvatarIndicator) {
                         stringResource(CommonStrings.a11y_settings_with_required_action)
@@ -339,11 +376,69 @@ private fun AccountIcon(
                     null
                 },
             )
+            if (statusEmoji != null) {
+                StatusEmojiBadge(
+                    emoji = statusEmoji,
+                    modifier = Modifier.align(Alignment.BottomEnd),
+                )
+            }
             if (showAvatarIndicator) {
                 RedIndicatorAtom(
                     modifier = Modifier.align(Alignment.TopEnd)
                 )
             }
+    }
+}
+
+private val statusEmojiBadgeSize = 20.dp
+private val statusEmojiBadgeRadius = statusEmojiBadgeSize / 2
+private val statusEmojiBadgeOffset = 8.dp
+
+private fun Modifier.eraseStatusEmojiBackground(
+    parentSize: Dp,
+    layoutDirection: LayoutDirection,
+): Modifier = this
+    .graphicsLayer {
+        compositingStrategy = CompositingStrategy.Offscreen
+    }
+    .drawWithContent {
+        drawContent()
+        drawCircle(
+            color = Color.Black,
+            center = Offset(
+                x = if (layoutDirection == LayoutDirection.Ltr) {
+                    (parentSize - statusEmojiBadgeRadius + statusEmojiBadgeOffset).toPx()
+                } else {
+                    (statusEmojiBadgeRadius - statusEmojiBadgeOffset).toPx()
+                },
+                y = size.height - statusEmojiBadgeRadius.toPx(),
+            ),
+            radius = statusEmojiBadgeRadius.toPx(),
+            blendMode = BlendMode.Clear,
+        )
+    }
+
+@Composable
+private fun StatusEmojiBadge(
+    emoji: String,
+    modifier: Modifier = Modifier,
+) {
+    val density = LocalDensity.current
+    // Ensure the emoji size is not affected by the user's font scale settings
+    val fixedFontScaleDensity = remember(density.density) {
+        Density(density = density.density, fontScale = 1f)
+    }
+    Box(
+        modifier = modifier
+            .offset(x = statusEmojiBadgeOffset)
+            .size(statusEmojiBadgeSize),
+        contentAlignment = Alignment.Center,
+    ) {
+        CompositionLocalProvider(LocalDensity provides fixedFontScaleDensity) {
+            Text(
+                text = emoji,
+                style = ElementTheme.typography.fontBodyMdRegular,
+            )
         }
     }
 }
@@ -432,6 +527,33 @@ internal fun HomeTopBarWithIndicatorPreview() = ElementPreview {
     )
 }
 
+@OptIn(ExperimentalMaterial3Api::class)
+@PreviewsDayNight
+@Composable
+internal fun HomeTopBarWithStatusPreview() = ElementPreview {
+    HomeTopBar(
+        selectedNavigationItem = HomeNavigationBarItem.Chats,
+        currentUserAndNeighbors = persistentListOf(
+            aMatrixUser(
+                id = "@id:domain",
+                displayName = USER_NAME_ALICE,
+                displayedStatus = DisplayedStatus.UserSet(UserStatus(emoji = "🌴", text = "Away")),
+            )
+        ),
+        showAvatarIndicator = false,
+        areSearchResultsDisplayed = false,
+        scrollBehavior = TopAppBarDefaults.pinnedScrollBehavior(rememberTopAppBarState()),
+        onOpenSettings = {},
+        onAccountSwitch = {},
+        onToggleSearch = {},
+        canReportBug = true,
+        displayFilters = true,
+        filtersState = aRoomListFiltersState(),
+        spaceFiltersState = anUnselectedSpaceFiltersState(),
+        onMenuActionClick = {},
+    )
+}
+
 @OptIn(ExperimentalMaterial3Api::class)
 @PreviewsDayNight
 @Composable