Updated on 2026-08-14

core/ui/src/main/java/com/tangem/core/ui/message/EventMessage.kt

@@ -0,0 +1,47 @@
+package com.tangem.core.ui.message
+
+import androidx.compose.material.SnackbarDuration
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.Immutable
+import androidx.compose.runtime.Stable
+import com.tangem.core.decompose.ui.UiMessage
+import com.tangem.core.ui.extensions.TextReference
+
+/**
+ * Event that is used to show a message in the UI.
+ *
+ * @see EventMessageHandler
+ * */
+@Immutable
+sealed interface EventMessage : UiMessage
+
+/**
+ * Shows a snackbar.
+ *
+ * @param message The message to show.
+ * @param duration The duration of the snackbar.
+ * @param actionLabel The label of the action button.
+ * @param action The action to perform when the action button is clicked.
+ * */
+data class SnackbarMessage(
+    val message: TextReference,
+    val duration: SnackbarDuration = SnackbarDuration.Short,
+    val actionLabel: TextReference? = null,
+    val action: (() -> Unit)? = null,
+) : EventMessage
+
+/**
+ * Shows a [content] in the UI.
+ *
+ * @param content The content to show.
+ * */
+data class ContentMessage(val content: Content) : EventMessage {
+
+    @Stable
+    fun interface Content {
+
+        @Suppress("ComposableFunctionName", "TopLevelComposableFunctions")
+        @Composable
+        operator fun invoke(onDismiss: () -> Unit)
+    }
+}

core/ui/src/main/java/com/tangem/core/ui/message/EventMessageEffect.kt

@@ -0,0 +1,43 @@
+package com.tangem.core.ui.message
+
+import android.content.Context
+import androidx.compose.material.SnackbarHostState
+import androidx.compose.material.SnackbarResult
+import androidx.compose.runtime.*
+import androidx.compose.ui.platform.LocalContext
+import com.tangem.core.ui.event.EventEffect
+import com.tangem.core.ui.extensions.resolveReference
+
+@Composable
+fun EventMessageEffect(messageHandler: EventMessageHandler, snackbarHostState: SnackbarHostState) {
+    val messageEvent by messageHandler.collectAsState()
+    val context = LocalContext.current
+    var contentMessage: ContentMessage? by remember { mutableStateOf(value = null) }
+
+    EventEffect(event = messageEvent) { message ->
+        when (message) {
+            is ContentMessage -> {
+                contentMessage = message
+            }
+            is SnackbarMessage -> {
+                showSnackbar(snackbarHostState, message, context)
+            }
+        }
+    }
+
+    contentMessage?.content?.invoke(
+        onDismiss = { contentMessage = null },
+    )
+}
+
+private suspend fun showSnackbar(snackbarHostState: SnackbarHostState, message: SnackbarMessage, context: Context) {
+    val result = snackbarHostState.showSnackbar(
+        message = message.message.resolveReference(context.resources),
+        actionLabel = message.actionLabel?.resolveReference(context.resources),
+        duration = message.duration,
+    )
+
+    if (result == SnackbarResult.ActionPerformed) {
+        message.action?.invoke()
+    }
+}

core/ui/src/main/java/com/tangem/core/ui/message/EventMessageHandler.kt

@@ -0,0 +1,27 @@
+package com.tangem.core.ui.message
+
+import com.tangem.core.decompose.ui.UiMessage
+import com.tangem.core.decompose.ui.UiMessageHandler
+import com.tangem.core.ui.event.StateEvent
+import com.tangem.core.ui.event.consumedEvent
+import com.tangem.core.ui.event.triggeredEvent
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+
+/**
+ * Message handler that is used to show or remove an [EventMessage] in the UI.
+ */
+class EventMessageHandler(
+    private val events: MutableStateFlow<StateEvent<EventMessage>>,
+) : UiMessageHandler, StateFlow<StateEvent<EventMessage>> by events {
+
+    override fun handleMessage(message: UiMessage) {
+        if (message !is EventMessage) return
+
+        events.value = triggeredEvent(message, ::consumeEvent)
+    }
+
+    private fun consumeEvent() {
+        events.value = consumedEvent()
+    }
+}

core/ui/src/main/java/com/tangem/core/ui/test/TestTags.kt

@@ -0,0 +1,9 @@
+package com.tangem.core.ui.test
+
+object TestTags {
+    const val STORIES_SCREEN = "STORIES_SCREEN_CONTAINER"
+    const val STORIES_SCREEN_SCAN_BUTTON = "STORIES_SCREEN_SCAN_BUTTON"
+    const val STORIES_SCREEN_ORDER_BUTTON = "STORIES_SCREEN_ORDER_BUTTON"
+
+    const val WALLET_SCREEN = "WALLET_SCREEN_CONTAINER"
+}