Render State Event in the timeline.

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/MessagesStateProvider.kt

@@ -20,9 +20,9 @@ import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.features.messages.impl.actionlist.anActionListState
 import io.element.android.features.messages.impl.textcomposer.AttachmentSourcePicker
 import io.element.android.features.messages.impl.textcomposer.aMessageComposerState
-import io.element.android.features.messages.impl.timeline.aTimelineItemContent
 import io.element.android.features.messages.impl.timeline.aTimelineItemList
 import io.element.android.features.messages.impl.timeline.aTimelineState
+import io.element.android.features.messages.impl.timeline.model.event.aTimelineItemTextContent
 import io.element.android.libraries.core.data.StableCharSequence
 import io.element.android.libraries.designsystem.components.avatar.AvatarData
 import io.element.android.libraries.matrix.api.core.RoomId
@@ -48,7 +48,7 @@ fun aMessagesState() = MessagesState(
         mode = MessageComposerMode.Normal("Hello"),
     ),
     timelineState = aTimelineState().copy(
-        timelineItems = aTimelineItemList(aTimelineItemContent()),
+        timelineItems = aTimelineItemList(aTimelineItemTextContent()),
     ),
     actionListState = anActionListState(),
     hasNetworkConnection = true,

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

@@ -21,7 +21,8 @@ import io.element.android.features.messages.impl.timeline.model.TimelineItem
 import io.element.android.features.messages.impl.timeline.model.TimelineItemGroupPosition
 import io.element.android.features.messages.impl.timeline.model.TimelineItemReactions
 import io.element.android.features.messages.impl.timeline.model.event.TimelineItemEventContent
-import io.element.android.features.messages.impl.timeline.model.event.TimelineItemTextContent
+import io.element.android.features.messages.impl.timeline.model.event.aTimelineItemStateEventContent
+import io.element.android.features.messages.impl.timeline.model.event.aTimelineItemTextContent
 import io.element.android.libraries.designsystem.components.avatar.AvatarData
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.core.UserId
@@ -55,6 +56,12 @@ internal fun aTimelineItemList(content: TimelineItemEventContent): ImmutableList
             content = content,
             groupPosition = TimelineItemGroupPosition.First
         ),
+        // A state event on top of it
+        aTimelineItemEvent(
+            isMine = false,
+            content = aTimelineItemStateEventContent(),
+            groupPosition = TimelineItemGroupPosition.None
+        ),
         // 3 items (First Middle Last) with isMine = true
         aTimelineItemEvent(
             isMine = true,
@@ -71,12 +78,18 @@ internal fun aTimelineItemList(content: TimelineItemEventContent): ImmutableList
             content = content,
             groupPosition = TimelineItemGroupPosition.First
         ),
+        // A state event on top of it
+        aTimelineItemEvent(
+            isMine = true,
+            content = aTimelineItemStateEventContent(),
+            groupPosition = TimelineItemGroupPosition.None
+        ),
     )
 }
 
 internal fun aTimelineItemEvent(
     isMine: Boolean = false,
-    content: TimelineItemEventContent = aTimelineItemContent(),
+    content: TimelineItemEventContent = aTimelineItemTextContent(),
     groupPosition: TimelineItemGroupPosition = TimelineItemGroupPosition.First
 ): TimelineItem.Event {
     val randomId = "\$" + Random.nextInt().toString()
@@ -96,10 +109,3 @@ internal fun aTimelineItemEvent(
         groupPosition = groupPosition,
     )
 }
-
-internal fun aTimelineItemContent(): TimelineItemEventContent {
-    return TimelineItemTextContent(
-        body = "Text",
-        htmlDocument = null
-    )
-}

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

@@ -55,6 +55,7 @@ import androidx.compose.ui.tooling.preview.PreviewParameter
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.zIndex
 import io.element.android.features.messages.impl.timeline.components.MessageEventBubble
+import io.element.android.features.messages.impl.timeline.components.MessageStateEventContainer
 import io.element.android.features.messages.impl.timeline.components.TimelineItemReactionsView
 import io.element.android.features.messages.impl.timeline.components.event.TimelineItemEventContentView
 import io.element.android.features.messages.impl.timeline.components.virtual.TimelineItemDaySeparatorView
@@ -63,6 +64,7 @@ import io.element.android.features.messages.impl.timeline.model.TimelineItem
 import io.element.android.features.messages.impl.timeline.model.bubble.BubbleState
 import io.element.android.features.messages.impl.timeline.model.event.TimelineItemEventContent
 import io.element.android.features.messages.impl.timeline.model.event.TimelineItemEventContentProvider
+import io.element.android.features.messages.impl.timeline.model.event.TimelineItemStateContent
 import io.element.android.features.messages.impl.timeline.model.virtual.TimelineItemDaySeparatorModel
 import io.element.android.features.messages.impl.timeline.model.virtual.TimelineItemLoadingModel
 import io.element.android.libraries.designsystem.components.avatar.Avatar
@@ -130,11 +132,12 @@ fun TimelineItemRow(
     onLongClick: (TimelineItem.Event) -> Unit,
 ) {
     when (timelineItem) {
-        is TimelineItem.Virtual -> TimelineItemVirtualRow(
+        is TimelineItem.Virtual -> {
+            TimelineItemVirtualRow(
                 virtual = timelineItem
             )
+        }
         is TimelineItem.Event -> {
-
             fun onClick() {
                 onClick(timelineItem)
             }
@@ -143,6 +146,14 @@ fun TimelineItemRow(
                 onLongClick(timelineItem)
             }
 
+            if (timelineItem.content is TimelineItemStateContent) {
+                TimelineItemStateEventRow(
+                    event = timelineItem,
+                    isHighlighted = isHighlighted,
+                    onClick = ::onClick,
+                    onLongClick = ::onLongClick
+                )
+            } else {
                 TimelineItemEventRow(
                     event = timelineItem,
                     isHighlighted = isHighlighted,
@@ -152,6 +163,7 @@ fun TimelineItemRow(
             }
         }
     }
+}
 
 @Composable
 fun TimelineItemVirtualRow(
@@ -232,6 +244,42 @@ fun TimelineItemEventRow(
     }
 }
 
+@Composable
+fun TimelineItemStateEventRow(
+    event: TimelineItem.Event,
+    isHighlighted: Boolean,
+    onClick: () -> Unit,
+    onLongClick: () -> Unit,
+    modifier: Modifier = Modifier
+) {
+    val interactionSource = remember { MutableInteractionSource() }
+    Box(
+        modifier = modifier
+            .fillMaxWidth()
+            .wrapContentHeight(),
+        contentAlignment = Alignment.Center
+    ) {
+        MessageStateEventContainer(
+            isHighlighted = isHighlighted,
+            interactionSource = interactionSource,
+            onClick = onClick,
+            onLongClick = onLongClick,
+            modifier = Modifier
+                .zIndex(-1f)
+                .widthIn(max = 320.dp)
+        ) {
+            val contentModifier = Modifier.padding(horizontal = 12.dp, vertical = 6.dp)
+            TimelineItemEventContentView(
+                content = event.content,
+                interactionSource = interactionSource,
+                onClick = onClick,
+                onLongClick = onLongClick,
+                modifier = contentModifier
+            )
+        }
+    }
+}
+
 @Composable
 private fun MessageSenderInformation(
     sender: String,

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

@@ -84,6 +84,7 @@ fun MessageEventBubble(
 
     fun Modifier.offsetForItem(): Modifier {
         return if (state.isMine) {
+            // FIXME setting y offset to -12.dp can overlap a state event displayed above.
             offset(y = -(12.dp))
         } else {
             offset(x = 20.dp, y = -(12.dp))

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

@@ -0,0 +1,99 @@
+/*
+ * 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.features.messages.impl.timeline.components
+
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.interaction.MutableInteractionSource
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.ripple.rememberRipple
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+import io.element.android.libraries.designsystem.preview.ElementPreviewDark
+import io.element.android.libraries.designsystem.preview.ElementPreviewLight
+import io.element.android.libraries.designsystem.theme.ElementTheme
+import io.element.android.libraries.designsystem.theme.components.Surface
+
+private val CORNER_RADIUS = 8.dp
+
+@OptIn(ExperimentalFoundationApi::class)
+@Composable
+fun MessageStateEventContainer(
+    isHighlighted: Boolean,
+    interactionSource: MutableInteractionSource,
+    modifier: Modifier = Modifier,
+    onClick: () -> Unit = {},
+    onLongClick: () -> Unit = {},
+    content: @Composable () -> Unit = {},
+) {
+    val backgroundColor = if (isHighlighted) {
+        ElementTheme.colors.messageHighlightedBackground
+    } else {
+        Color.Companion.Transparent
+    }
+    val shape = RoundedCornerShape(CORNER_RADIUS)
+    Surface(
+        modifier = modifier
+            .widthIn(min = 80.dp)
+            .clip(shape)
+            .combinedClickable(
+                onClick = onClick,
+                onLongClick = onLongClick,
+                indication = rememberRipple(),
+                interactionSource = interactionSource
+            ),
+        color = backgroundColor,
+        shape = shape,
+        content = content
+    )
+}
+
+@Preview
+@Composable
+internal fun MessageStateEventContainerLightPreview() =
+    ElementPreviewLight { ContentToPreview() }
+
+@Preview
+@Composable
+internal fun MessageStateEventContainerDarkPreview() =
+    ElementPreviewDark { ContentToPreview() }
+
+@Composable
+private fun ContentToPreview() {
+    Column {
+        MessageStateEventContainer(
+            isHighlighted = false,
+            interactionSource = MutableInteractionSource(),
+        ) {
+            Spacer(modifier = Modifier.size(width = 120.dp, height = 32.dp))
+        }
+        MessageStateEventContainer(
+            isHighlighted = true,
+            interactionSource = MutableInteractionSource(),
+        ) {
+            Spacer(modifier = Modifier.size(width = 120.dp, height = 32.dp))
+        }
+    }
+}

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

@@ -23,6 +23,7 @@ import io.element.android.features.messages.impl.timeline.model.event.TimelineIt
 import io.element.android.features.messages.impl.timeline.model.event.TimelineItemEventContent
 import io.element.android.features.messages.impl.timeline.model.event.TimelineItemImageContent
 import io.element.android.features.messages.impl.timeline.model.event.TimelineItemRedactedContent
+import io.element.android.features.messages.impl.timeline.model.event.TimelineItemStateContent
 import io.element.android.features.messages.impl.timeline.model.event.TimelineItemTextBasedContent
 import io.element.android.features.messages.impl.timeline.model.event.TimelineItemUnknownContent
 
@@ -58,5 +59,9 @@ fun TimelineItemEventContentView(
             content = content,
             modifier = modifier
         )
+        is TimelineItemStateContent -> TimelineItemStateView(
+            content = content,
+            modifier = modifier
+        )
     }
 }

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

@@ -0,0 +1,58 @@
+/*
+ * 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.features.messages.impl.timeline.components.event
+
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.sp
+import io.element.android.features.messages.impl.timeline.model.event.TimelineItemStateContent
+import io.element.android.features.messages.impl.timeline.model.event.aTimelineItemStateEventContent
+import io.element.android.libraries.designsystem.preview.ElementPreviewDark
+import io.element.android.libraries.designsystem.preview.ElementPreviewLight
+import io.element.android.libraries.designsystem.theme.components.Text
+
+@Composable
+fun TimelineItemStateView(
+    content: TimelineItemStateContent,
+    modifier: Modifier = Modifier
+) {
+    Text(
+        modifier = modifier,
+        color = MaterialTheme.colorScheme.secondary,
+        fontSize = 13.sp,
+        text = content.body,
+        textAlign = TextAlign.Center,
+    )
+}
+
+@Preview
+@Composable
+internal fun TimelineItemStateViewLightPreview() = ElementPreviewLight { ContentToPreview() }
+
+@Preview
+@Composable
+internal fun TimelineItemStateViewDarkPreview() = ElementPreviewDark { ContentToPreview() }
+
+@Composable
+private fun ContentToPreview() {
+    TimelineItemStateView(
+        content = aTimelineItemStateEventContent(),
+    )
+}

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/model/event/TimelineItemEventContentProvider.kt

@@ -65,3 +65,7 @@ fun aTimelineItemTextContent() = TimelineItemTextContent(
 )
 
 fun aTimelineItemUnknownContent() = TimelineItemUnknownContent
+
+fun aTimelineItemStateEventContent() = TimelineItemStateEventContent(
+    body = "A state event",
+)

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/model/event/TimelineItemProfileChangeContent.kt

@@ -16,11 +16,8 @@
 
 package io.element.android.features.messages.impl.timeline.model.event
 
-import org.jsoup.nodes.Document
-
 data class TimelineItemProfileChangeContent(
     override val body: String,
-    override val htmlDocument: Document? = null
+) : TimelineItemStateContent {
-) : TimelineItemTextBasedContent {
     override val type: String = "TimelineItemProfileChangeContent"
 }

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/model/event/TimelineItemRoomMembershipContent.kt

@@ -16,11 +16,8 @@
 
 package io.element.android.features.messages.impl.timeline.model.event
 
-import org.jsoup.nodes.Document
-
 data class TimelineItemRoomMembershipContent(
     override val body: String,
-    override val htmlDocument: Document? = null
+) : TimelineItemStateContent {
-) : TimelineItemTextBasedContent {
     override val type: String = "TimelineItemRoomMembershipContent"
 }

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/model/event/TimelineItemStateContent.kt

@@ -0,0 +1,21 @@
+/*
+ * 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.features.messages.impl.timeline.model.event
+
+sealed interface TimelineItemStateContent : TimelineItemEventContent {
+    val body: String
+}

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/model/event/TimelineItemStateEventContent.kt

@@ -16,11 +16,8 @@
 
 package io.element.android.features.messages.impl.timeline.model.event
 
-import org.jsoup.nodes.Document
-
 data class TimelineItemStateEventContent(
     override val body: String,
-    override val htmlDocument: Document? = null
+) : TimelineItemStateContent {
-) : TimelineItemTextBasedContent {
     override val type: String = "TimelineItemStateEventContent"
 }