adding swiping to start reply process

features/messenger/src/main/kotlin/app/dapk/st/messenger/MessengerScreen.kt

@@ -2,10 +2,17 @@ package app.dapk.st.messenger
 
 import android.content.res.Configuration
 import androidx.activity.result.ActivityResultLauncher
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.core.Animatable
+import androidx.compose.animation.slideInVertically
+import androidx.compose.animation.slideOutVertically
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
 import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.gestures.Orientation
+import androidx.compose.foundation.gestures.draggable
+import androidx.compose.foundation.gestures.rememberDraggableState
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.*
 import androidx.compose.foundation.shape.CircleShape
@@ -53,6 +60,7 @@ import app.dapk.st.navigator.Navigator
 import coil.compose.rememberAsyncImagePainter
 import coil.request.ImageRequest
 import kotlinx.coroutines.launch
+import kotlin.math.roundToInt
 
 @Composable
 internal fun MessengerScreen(
@@ -83,7 +91,9 @@ internal fun MessengerScreen(
         })
         when (state.composerState) {
             is ComposerState.Text -> {
-                Room(state.roomState)
+                Room(state.roomState, onReply = {
+                    viewModel.post(MessengerAction.ComposerEnterReplyMode(it))
+                })
                 TextComposer(
                     state.composerState,
                     onTextChange = { viewModel.post(MessengerAction.ComposerTextUpdate(it)) },
@@ -119,11 +129,11 @@ private fun MessengerViewModel.ObserveEvents(galleryLauncher: ActivityResultLaun
 }
 
 @Composable
-private fun ColumnScope.Room(roomStateLce: Lce<MessengerState>) {
+private fun ColumnScope.Room(roomStateLce: Lce<MessengerState>, onReply: (RoomEvent) -> Unit) {
     when (val state = roomStateLce) {
         is Lce.Loading -> CenteredLoading()
         is Lce.Content -> {
-            RoomContent(state.value.self, state.value.roomState)
+            RoomContent(state.value.self, state.value.roomState, onReply)
             val eventBarHeight = 14.dp
             val typing = state.value.typing
             when {
@@ -166,7 +176,7 @@ private fun ColumnScope.Room(roomStateLce: Lce<MessengerState>) {
 }
 
 @Composable
-private fun ColumnScope.RoomContent(self: UserId, state: RoomState) {
+private fun ColumnScope.RoomContent(self: UserId, state: RoomState, onReply: (RoomEvent) -> Unit) {
     val listState: LazyListState = rememberLazyListState(
         initialFirstVisibleItemIndex = 0
     )
@@ -192,7 +202,7 @@ private fun ColumnScope.RoomContent(self: UserId, state: RoomState) {
         ) { index, item ->
             val previousEvent = if (index != 0) state.events[index - 1] else null
             val wasPreviousMessageSameSender = previousEvent?.author?.id == item.author.id
-            AlignedBubble(item, self, wasPreviousMessageSameSender) {
+            AlignedBubble(item, self, wasPreviousMessageSameSender, onReply) {
                 when (item) {
                     is RoomEvent.Image -> MessageImage(it as BubbleContent<RoomEvent.Image>)
                     is Message -> TextBubbleContent(it as BubbleContent<RoomEvent.Message>)
@@ -215,6 +225,7 @@ private fun <T : RoomEvent> LazyItemScope.AlignedBubble(
     message: T,
     self: UserId,
     wasPreviousMessageSameSender: Boolean,
+    onReply: (RoomEvent) -> Unit,
     content: @Composable (BubbleContent<T>) -> Unit
 ) {
     when (message.author.id == self) {
@@ -224,7 +235,8 @@ private fun <T : RoomEvent> LazyItemScope.AlignedBubble(
                     Bubble(
                         message = message,
                         isNotSelf = false,
-                        wasPreviousMessageSameSender = wasPreviousMessageSameSender
+                        wasPreviousMessageSameSender = wasPreviousMessageSameSender,
+                        onReply = onReply,
                     ) {
                         content(BubbleContent(selfBackgroundShape, SmallTalkTheme.extendedColors.selfBubble, false, message))
                     }
@@ -237,7 +249,8 @@ private fun <T : RoomEvent> LazyItemScope.AlignedBubble(
                 Bubble(
                     message = message,
                     isNotSelf = true,
-                    wasPreviousMessageSameSender = wasPreviousMessageSameSender
+                    wasPreviousMessageSameSender = wasPreviousMessageSameSender,
+                    onReply = onReply,
                 ) {
                     content(BubbleContent(othersBackgroundShape, SmallTalkTheme.extendedColors.othersBubble, true, message))
                 }
@@ -332,9 +345,39 @@ private fun Bubble(
     message: RoomEvent,
     isNotSelf: Boolean,
     wasPreviousMessageSameSender: Boolean,
+    onReply: (RoomEvent) -> Unit,
     content: @Composable () -> Unit
 ) {
-    Row(Modifier.padding(horizontal = 12.dp)) {
+
+    val screenWidthDp = LocalConfiguration.current.screenWidthDp.dp
+    val localDensity = LocalDensity.current
+
+    val coroutineScope = rememberCoroutineScope()
+    val offsetX = remember { Animatable(0f) }
+
+    Row(
+        Modifier.padding(horizontal = 12.dp)
+            .offset { IntOffset(offsetX.value.roundToInt(), 0) }
+            .draggable(
+                orientation = Orientation.Horizontal,
+                state = rememberDraggableState {
+                    if ((offsetX.value + it) > 0) {
+                        coroutineScope.launch { offsetX.snapTo(offsetX.value + it) }
+                    }
+                },
+                onDragStopped = {
+                    with(localDensity) {
+                        if (offsetX.value > (screenWidthDp.toPx() * 0.15)) {
+                            onReply(message)
+                        }
+                    }
+
+                    coroutineScope.launch {
+                        offsetX.animateTo(targetValue = 0f)
+                    }
+                }
+            )
+    ) {
         when {
             isNotSelf -> {
                 val displayImageSize = 32.dp
@@ -583,9 +626,29 @@ private fun TextComposer(state: ComposerState.Text, onTextChange: (String) -> Un
             .fillMaxWidth()
             .height(IntrinsicSize.Min), verticalAlignment = Alignment.Bottom
     ) {
+        Column(
+            modifier = Modifier
+                .weight(1f)
+                .fillMaxHeight()
+        ) {
+//            AnimatedVisibility(
+//                visible = state.reply?.let { it is Message } ?: false,
+//                enter = slideInVertically { it - 50 },
+//                exit = slideOutVertically { it - 50 },
+//            ) {
+//
+//                val message = state.reply as Message
+//                Column(
+//                    modifier = Modifier
+//                        .background(SmallTalkTheme.extendedColors.othersBubble, RoundedCornerShape(topStart = 24.dp, topEnd = 24.dp))
+//                ) {
+//                    Text(message.author.displayName ?: message.author.id.value)
+//                    Text(message.content)
+//                    Spacer(Modifier.height(50.dp))
+//                }
+//            }
             Box(
                 modifier = Modifier
-                .align(Alignment.Bottom)
                     .weight(1f)
                     .fillMaxHeight()
                     .background(SmallTalkTheme.extendedColors.othersBubble, RoundedCornerShape(24.dp)),
@@ -615,6 +678,7 @@ private fun TextComposer(state: ComposerState.Text, onTextChange: (String) -> Un
                     )
                 }
             }
+        }
         Spacer(modifier = Modifier.width(6.dp))
         var size by remember { mutableStateOf(IntSize(0, 0)) }
         val enabled = state.value.isNotEmpty()

features/messenger/src/main/kotlin/app/dapk/st/messenger/MessengerState.kt

@@ -2,6 +2,7 @@ package app.dapk.st.messenger
 
 import app.dapk.st.core.Lce
 import app.dapk.st.matrix.common.RoomId
+import app.dapk.st.matrix.sync.RoomEvent
 import app.dapk.st.navigator.MessageAttachment
 
 data class MessengerScreenState(
@@ -16,12 +17,16 @@ sealed interface MessengerEvent {
 
 sealed interface ComposerState {
 
+    val reply: RoomEvent?
+
     data class Text(
         val value: String,
+        override val reply: RoomEvent?,
     ) : ComposerState
 
     data class Attachments(
         val values: List<MessageAttachment>,
+        override val reply: RoomEvent?,
     ) : ComposerState
 
 }

features/messenger/src/main/kotlin/app/dapk/st/messenger/MessengerViewModel.kt

@@ -34,7 +34,7 @@ internal class MessengerViewModel(
     initialState = MessengerScreenState(
         roomId = null,
         roomState = Lce.Loading(),
-        composerState = ComposerState.Text(value = "")
+        composerState = ComposerState.Text(value = "", reply = null)
     ),
     factory = factory,
 ) {
@@ -45,15 +45,40 @@ internal class MessengerViewModel(
         when (action) {
             is MessengerAction.OnMessengerVisible -> start(action)
             MessengerAction.OnMessengerGone -> syncJob?.cancel()
-            is MessengerAction.ComposerTextUpdate -> updateState { copy(composerState = ComposerState.Text(action.newValue)) }
+            is MessengerAction.ComposerTextUpdate -> updateState { copy(composerState = ComposerState.Text(action.newValue, composerState.reply)) }
             MessengerAction.ComposerSendText -> sendMessage()
-            MessengerAction.ComposerClear -> updateState { copy(composerState = ComposerState.Text("")) }
-            is MessengerAction.ComposerImageUpdate -> updateState { copy(composerState = ComposerState.Attachments(listOf(action.newValue))) }
+            MessengerAction.ComposerClear -> resetComposer()
+            is MessengerAction.ComposerImageUpdate -> updateState {
+                copy(
+                    composerState = ComposerState.Attachments(
+                        listOf(action.newValue),
+                        composerState.reply
+                    )
+                )
+            }
+
+            is MessengerAction.ComposerEnterReplyMode -> updateState {
+                copy(
+                    composerState = when (composerState) {
+                        is ComposerState.Attachments -> composerState.copy(reply = action.replyingTo)
+                        is ComposerState.Text -> composerState.copy(reply = action.replyingTo)
+                    }
+                )
+            }
+
+            MessengerAction.ComposerExitReplyMode -> updateState {
+                copy(
+                    composerState = when (composerState) {
+                        is ComposerState.Attachments -> composerState.copy(reply = null)
+                        is ComposerState.Text -> composerState.copy(reply = null)
+                    }
+                )
+            }
         }
     }
 
     private fun start(action: MessengerAction.OnMessengerVisible) {
-        updateState { copy(roomId = action.roomId, composerState = action.attachments?.let { ComposerState.Attachments(it) } ?: composerState) }
+        updateState { copy(roomId = action.roomId, composerState = action.attachments?.let { ComposerState.Attachments(it, null) } ?: composerState) }
         syncJob = viewModelScope.launch {
             roomStore.markRead(action.roomId)
 
@@ -104,7 +129,7 @@ internal class MessengerViewModel(
 
             is ComposerState.Attachments -> {
                 val copy = composerState.copy()
-                updateState { copy(composerState = ComposerState.Text("")) }
+                resetComposer()
 
                 state.roomState.takeIfContent()?.let { content ->
                     val roomState = content.roomState
@@ -125,6 +150,10 @@ internal class MessengerViewModel(
         }
     }
 
+    private fun resetComposer() {
+        updateState { copy(composerState = ComposerState.Text("", reply = null)) }
+    }
+
     fun startAttachment() {
         viewModelScope.launch {
             _events.emit(MessengerEvent.SelectImageAttachment)
@@ -141,6 +170,8 @@ private fun MessengerState.latestMessageEventFromOthers(self: UserId) = this.roo
 
 sealed interface MessengerAction {
     data class ComposerTextUpdate(val newValue: String) : MessengerAction
+    data class ComposerEnterReplyMode(val replyingTo: RoomEvent) : MessengerAction
+    object ComposerExitReplyMode : MessengerAction
     data class ComposerImageUpdate(val newValue: MessageAttachment) : MessengerAction
     object ComposerSendText : MessengerAction
     object ComposerClear : MessengerAction