Updated on 2026-08-14

features/send-v2/impl/src/main/java/com/tangem/features/send/v2/send/DefaultSendComponent.kt

@@ -201,7 +201,7 @@ internal class DefaultSendComponent @AssistedInject constructor(
             params = SendConfirmComponent.Params(
                 state = model.uiState.value,
                 userWallet = model.userWallet,
-                currentRoute = currentRoute.filterIsInstance<SendRoute.Confirm>(),
+                currentRoute = currentRoute,
                 isBalanceHidingFlow = model.isBalanceHiddenFlow,
                 analyticsCategoryName = SendAnalyticEvents.SEND_CATEGORY,
                 cryptoCurrencyStatus = model.cryptoCurrencyStatus,

features/send-v2/impl/src/main/java/com/tangem/features/send/v2/send/confirm/SendConfirmComponent.kt

@@ -140,7 +140,7 @@ internal class SendConfirmComponent(
         val feeCryptoCurrencyStatus: CryptoCurrencyStatus,
         val appCurrency: AppCurrency,
         val callback: ModelCallback,
-        val currentRoute: Flow<SendRoute.Confirm>,
+        val currentRoute: Flow<SendRoute>,
         val isBalanceHidingFlow: StateFlow<Boolean>,
         val predefinedValues: PredefinedValues,
     ) {

features/send-v2/impl/src/main/java/com/tangem/features/send/v2/send/confirm/model/SendConfirmModel.kt

@@ -490,7 +490,7 @@ internal class SendConfirmModel @Inject constructor(
             flow = uiState,
             flow2 = params.currentRoute,
             transform = { state, route -> state to route },
-        ).onEach { (state, _) ->
+        ).filter { it.second is SendRoute.Confirm }.onEach { (state, _) ->
             val amountUM = state.amountUM as? AmountState.Data
             val confirmUM = state.confirmUM
             params.callback.onResult(

features/send-v2/impl/src/main/java/com/tangem/features/send/v2/send/model/SendModel.kt

@@ -31,11 +31,12 @@ import com.tangem.domain.wallets.usecase.GetUserWalletUseCase
 import com.tangem.features.send.v2.api.SendComponent
 import com.tangem.features.send.v2.common.NavigationUM
 import com.tangem.features.send.v2.send.SendRoute
-import com.tangem.features.send.v2.send.confirm.model.SendConfirmAlertFactory
 import com.tangem.features.send.v2.send.confirm.SendConfirmComponent
+import com.tangem.features.send.v2.send.confirm.model.SendConfirmAlertFactory
 import com.tangem.features.send.v2.send.confirm.ui.state.ConfirmUM
 import com.tangem.features.send.v2.send.ui.state.SendUM
 import com.tangem.features.send.v2.subcomponents.amount.SendAmountComponent
+import com.tangem.features.send.v2.subcomponents.amount.SendAmountUpdateQRTrigger
 import com.tangem.features.send.v2.subcomponents.destination.SendDestinationComponent
 import com.tangem.features.send.v2.subcomponents.destination.model.transformers.SendDestinationInitialStateTransformer
 import com.tangem.features.send.v2.subcomponents.destination.ui.state.DestinationUM
@@ -74,6 +75,7 @@ internal class SendModel @Inject constructor(
     private val getCardInfoUseCase: GetCardInfoUseCase,
     private val sendFeedbackEmailUseCase: SendFeedbackEmailUseCase,
     private val getBalanceHidingSettingsUseCase: GetBalanceHidingSettingsUseCase,
+    private val sendAmountUpdateQRTrigger: SendAmountUpdateQRTrigger,
 ) : Model(), SendComponentCallback {
 
     private val params: SendComponent.Params = paramsContainer.require()
@@ -110,6 +112,7 @@ internal class SendModel @Inject constructor(
     }
 
     override fun onAmountResult(amountUM: AmountState) {
+        predefinedAmountValue = null // reset predefined amount
         _uiState.update { it.copy(amountUM = amountUM) }
     }
 
@@ -118,6 +121,7 @@ internal class SendModel @Inject constructor(
     }
 
     override fun onResult(sendUM: SendUM) {
+        predefinedAmountValue = null // reset predefined amount
         _uiState.update { sendUM }
     }
 
@@ -227,7 +231,13 @@ internal class SendModel @Inject constructor(
 
     private fun onQrCodeScanned(address: String) {
         val parsedQrCode = parseQrCodeUseCase(address, cryptoCurrency).getOrNull()
+        // Decompose component can be active or inactive depending on its state and navigation stack
+        // If it is in inactive state use parameter to pass value to amount component
         predefinedAmountValue = parsedQrCode?.amount?.parseBigDecimal(cryptoCurrency.decimals)
+        // If it is in active state use flow to update value in amount component
+        modelScope.launch {
+            predefinedAmountValue?.let { sendAmountUpdateQRTrigger.triggerUpdateAmount(it) }
+        }
     }
 
     private fun onFailedTxEmailClick(errorMessage: String? = null) {

features/send-v2/impl/src/main/java/com/tangem/features/send/v2/subcomponents/amount/SendAmountReduceTrigger.kt

@@ -25,14 +25,33 @@ interface SendAmountReduceListener {
     val ignoreReduceTriggerFlow: Flow<Unit>
 }
 
+/**
+ * Trigger amount change from another component.
+ * Different from another triggers because it takes raw string instead of BigDecimal
+ */
+interface SendAmountUpdateQRTrigger {
+    suspend fun triggerUpdateAmount(amountValue: String)
+}
+
+/**
+ * Trigger amount change from another component.
+ * Different from another triggers because it takes raw string instead of BigDecimal
+ */
+interface SendAmountUpdateQRListener {
+    val updateAmountTriggerFlow: Flow<String>
+}
+
 @Singleton
 internal class DefaultSendAmountReduceTrigger @Inject constructor() :
     SendAmountReduceTrigger,
-    SendAmountReduceListener {
+    SendAmountReduceListener,
+    SendAmountUpdateQRTrigger,
+    SendAmountUpdateQRListener {
 
     override val reduceToTriggerFlow = MutableSharedFlow<BigDecimal>()
     override val reduceByTriggerFlow = MutableSharedFlow<ReduceByData>()
     override val ignoreReduceTriggerFlow = MutableSharedFlow<Unit>()
+    override val updateAmountTriggerFlow = MutableSharedFlow<String>()
 
     override suspend fun triggerReduceBy(reduceBy: ReduceByData) {
         reduceByTriggerFlow.emit(reduceBy)
@@ -45,4 +64,8 @@ internal class DefaultSendAmountReduceTrigger @Inject constructor() :
     override suspend fun triggerIgnoreReduce() {
         ignoreReduceTriggerFlow.emit(Unit)
     }
+
+    override suspend fun triggerUpdateAmount(amountValue: String) {
+        updateAmountTriggerFlow.emit(amountValue)
+    }
 }

features/send-v2/impl/src/main/java/com/tangem/features/send/v2/subcomponents/amount/di/SendAmountModule.kt

@@ -1,8 +1,7 @@
 package com.tangem.features.send.v2.subcomponents.amount.di
 
+import com.tangem.features.send.v2.subcomponents.amount.*
 import com.tangem.features.send.v2.subcomponents.amount.DefaultSendAmountReduceTrigger
-import com.tangem.features.send.v2.subcomponents.amount.SendAmountReduceListener
-import com.tangem.features.send.v2.subcomponents.amount.SendAmountReduceTrigger
 import dagger.Binds
 import dagger.Module
 import dagger.hilt.InstallIn
@@ -20,4 +19,12 @@ internal interface SendAmountModule {
     @Singleton
     @Binds
     fun provideSendAmountReduceListener(impl: DefaultSendAmountReduceTrigger): SendAmountReduceListener
+
+    @Singleton
+    @Binds
+    fun provideSendAmountUpdateQRListener(impl: DefaultSendAmountReduceTrigger): SendAmountUpdateQRListener
+
+    @Singleton
+    @Binds
+    fun provideSendAmountUpdateQRTrigger(impl: DefaultSendAmountReduceTrigger): SendAmountUpdateQRTrigger
 }

features/send-v2/impl/src/main/java/com/tangem/features/send/v2/subcomponents/amount/model/SendAmountModel.kt

@@ -27,6 +27,7 @@ import com.tangem.features.send.v2.send.analytics.SendAnalyticEvents.SendScreenS
 import com.tangem.features.send.v2.send.ui.state.ButtonsUM
 import com.tangem.features.send.v2.subcomponents.amount.SendAmountComponentParams
 import com.tangem.features.send.v2.subcomponents.amount.SendAmountReduceListener
+import com.tangem.features.send.v2.subcomponents.amount.SendAmountUpdateQRListener
 import com.tangem.features.send.v2.subcomponents.amount.analytics.SendAmountAnalyticEvents
 import com.tangem.features.send.v2.subcomponents.amount.analytics.SendAmountAnalyticEvents.SelectedCurrencyType
 import com.tangem.features.send.v2.subcomponents.fee.SendFeeData
@@ -50,6 +51,7 @@ internal class SendAmountModel @Inject constructor(
     private val getMinimumTransactionAmountSyncUseCase: GetMinimumTransactionAmountSyncUseCase,
     private val sendAmountReduceListener: SendAmountReduceListener,
     private val feeReloadTrigger: SendFeeReloadTrigger,
+    private val sendAmountUpdateQRListener: SendAmountUpdateQRListener,
     private val analyticsEventHandler: AnalyticsEventHandler,
 ) : Model(), AmountScreenClickIntents {
 
@@ -71,6 +73,7 @@ internal class SendAmountModel @Inject constructor(
         subscribeOnAmountReduceByTriggerUpdates()
         subscribeOnAmountReduceToTriggerUpdates()
         subscribeOnAmountIgnoreReduceTriggerUpdates()
+        subscribeOnAmountUpdateQRTriggerUpdates()
     }
 
     private fun initMinBoundary() {
@@ -105,8 +108,8 @@ internal class SendAmountModel @Inject constructor(
                     ),
                 )
             }
-            params.predefinedAmountValue?.let(::onAmountValueChange)
         }
+        params.predefinedAmountValue?.let(::onAmountValueChange)
     }
 
     fun updateState(amountUM: AmountState) {
@@ -215,6 +218,14 @@ internal class SendAmountModel @Inject constructor(
             .launchIn(modelScope)
     }
 
+    private fun subscribeOnAmountUpdateQRTriggerUpdates() {
+        sendAmountUpdateQRListener.updateAmountTriggerFlow
+            .onEach { amount ->
+                onAmountValueChange(amount)
+                saveResult()
+            }.launchIn(modelScope)
+    }
+
     private fun saveResult() {
         val params = params as? SendAmountComponentParams.AmountParams ?: return
         params.callback.onAmountResult(uiState.value)