Improve animation of Swipe to reply: replace usage of SwipeToDismiss by Modifier.draggable

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/TimelineItemEventRow.kt

@@ -14,13 +14,13 @@
  * limitations under the License.
  */
 
-@file:OptIn(ExperimentalMaterial3Api::class)
-
 package io.element.android.features.messages.impl.timeline.components
 
 import androidx.compose.foundation.Canvas
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.gestures.Orientation
+import androidx.compose.foundation.gestures.draggable
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -28,6 +28,7 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.absoluteOffset
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
@@ -35,15 +36,10 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.layout.wrapContentHeight
 import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.material3.DismissDirection
-import androidx.compose.material3.DismissState
-import androidx.compose.material3.DismissValue
-import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.SwipeToDismiss
-import androidx.compose.material3.rememberDismissState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
@@ -55,6 +51,7 @@ import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.tooling.preview.PreviewParameter
 import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.IntOffset
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.compose.ui.zIndex
@@ -78,6 +75,9 @@ import io.element.android.libraries.designsystem.components.avatar.Avatar
 import io.element.android.libraries.designsystem.components.avatar.AvatarData
 import io.element.android.libraries.designsystem.preview.ElementPreviewDark
 import io.element.android.libraries.designsystem.preview.ElementPreviewLight
+import io.element.android.libraries.designsystem.swipe.SwipeableActionsState
+import io.element.android.libraries.designsystem.swipe.rememberSwipeableActionsState
+import io.element.android.libraries.designsystem.text.toPx
 import io.element.android.libraries.designsystem.theme.components.Text
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.core.UserId
@@ -93,7 +93,10 @@ import io.element.android.libraries.matrix.ui.components.AttachmentThumbnailInfo
 import io.element.android.libraries.matrix.ui.components.AttachmentThumbnailType
 import io.element.android.libraries.theme.ElementTheme
 import io.element.android.libraries.ui.strings.CommonStrings
+import kotlinx.coroutines.launch
 import org.jsoup.Jsoup
+import kotlin.math.abs
+import kotlin.math.roundToInt
 
 @Composable
 fun TimelineItemEventRow(
@@ -110,6 +113,7 @@ fun TimelineItemEventRow(
     onSwipeToReply: () -> Unit,
     modifier: Modifier = Modifier
 ) {
+    val coroutineScope = rememberCoroutineScope()
     val interactionSource = remember { MutableInteractionSource() }
 
     fun onUserDataClicked() {
@@ -123,38 +127,30 @@ fun TimelineItemEventRow(
 
     Column(modifier = modifier.fillMaxWidth()) {
         if (canReply) {
-            val dismissState = rememberDismissState(
-                confirmValueChange = {
-                    if (it == DismissValue.DismissedToEnd) {
+            val state: SwipeableActionsState = rememberSwipeableActionsState()
+            val offset = state.offset.value
+            val swipeThresholdPx = 40.dp.toPx()
+            val thresholdCrossed = abs(offset) > swipeThresholdPx
+            Box(Modifier.fillMaxWidth()) {
+                Row(modifier = Modifier.matchParentSize()) {
+                    ReplySwipeIndicator({ offset / 120 })
+                }
+                TimelineItemEventRowContent(
+                    modifier = Modifier
+                        .absoluteOffset { IntOffset(x = offset.roundToInt(), y = 0) }
+                        .draggable(
+                            orientation = Orientation.Horizontal,
+                            enabled = !state.isResettingOnRelease,
+                            onDragStopped = {
+                                coroutineScope.launch {
+                                    if (thresholdCrossed) {
                                         onSwipeToReply()
                                     }
-                    // Do not dismiss the message, return false!
-                    false
+                                    state.resetOffset()
                                 }
-            )
-            SwipeToDismiss(
-                state = dismissState,
-                background = {
-                    ReplySwipeIndicator({ dismissState.toSwipeProgress() })
                             },
-                directions = setOf(DismissDirection.StartToEnd),
-                dismissContent = {
-                    TimelineItemEventRowContent(
-                        event = event,
-                        isHighlighted = isHighlighted,
-                        interactionSource = interactionSource,
-                        onClick = onClick,
-                        onLongClick = onLongClick,
-                        onTimestampClicked = onTimestampClicked,
-                        inReplyToClicked = ::inReplyToClicked,
-                        onUserDataClicked = ::onUserDataClicked,
-                        onReactionClicked = { emoji -> onReactionClick(emoji, event) },
-                        onMoreReactionsClicked = { onMoreReactionsClick(event) },
-                    )
-                }
-            )
-        } else {
-            TimelineItemEventRowContent(
+                            state = state.draggableState,
+                        ),
                     event = event,
                     isHighlighted = isHighlighted,
                     interactionSource = interactionSource,
@@ -174,6 +170,7 @@ fun TimelineItemEventRow(
             }
         }
     }
+}
 
 @Composable
 private fun TimelineItemEventRowContent(
@@ -267,14 +264,6 @@ private fun TimelineItemEventRowContent(
     }
 }
 
-private fun DismissState.toSwipeProgress(): Float {
-    return when (targetValue) {
-        DismissValue.Default -> 0f
-        DismissValue.DismissedToEnd -> progress * 3
-        DismissValue.DismissedToStart -> progress * 3
-    }
-}
-
 @Composable
 private fun MessageSenderInformation(
     sender: String,
@@ -700,7 +689,6 @@ private fun ContentTimestampToPreview(event: TimelineItem.Event) {
     }
 }
 
-
 @Preview
 @Composable
 internal fun TimelineItemEventRowWithManyReactionsLightPreview() =

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/swipe/SwipeableActionsState.kt

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.libraries.designsystem.swipe
+
+import androidx.compose.animation.core.Animatable
+import androidx.compose.animation.core.tween
+import androidx.compose.foundation.MutatePriority
+import androidx.compose.foundation.gestures.DraggableState
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.Stable
+import androidx.compose.runtime.State
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+
+/**
+ * Inspired from https://github.com/bmarty/swipe/blob/trunk/swipe/src/main/kotlin/me/saket/swipe/SwipeableActionsState.kt
+ */
+@Composable
+fun rememberSwipeableActionsState(): SwipeableActionsState {
+    return remember { SwipeableActionsState() }
+}
+
+@Stable
+class SwipeableActionsState {
+    /**
+     * The current position (in pixels) of the content.
+     */
+    val offset: State<Float> get() = offsetState
+    private var offsetState = mutableStateOf(0f)
+
+    /**
+     * Whether the content is currently animating to reset its offset after it was swiped.
+     */
+    var isResettingOnRelease: Boolean by mutableStateOf(false)
+        private set
+
+    val draggableState = DraggableState { delta ->
+        val targetOffset = offsetState.value + delta
+        val isAllowed = isResettingOnRelease || targetOffset > 0f
+
+        offsetState.value += if (isAllowed) delta else 0f
+    }
+
+    suspend fun resetOffset() {
+        draggableState.drag(MutatePriority.PreventUserInput) {
+            isResettingOnRelease = true
+            try {
+                Animatable(offsetState.value).animateTo(
+                    targetValue = 0f,
+                    animationSpec = tween(durationMillis = 300),
+                ) {
+                    dragBy(value - offsetState.value)
+                }
+            } finally {
+                isResettingOnRelease = false
+            }
+        }
+    }
+}