Add Preview for timeline items.

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

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2022 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.timeline.components
+
+import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.CornerSize
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+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.sp
+import io.element.android.features.messages.timeline.model.AggregatedReaction
+import io.element.android.features.messages.timeline.model.AggregatedReactionProvider
+import io.element.android.libraries.designsystem.preview.ElementPreviewDark
+import io.element.android.libraries.designsystem.preview.ElementPreviewLight
+import io.element.android.libraries.designsystem.theme.components.Surface
+import io.element.android.libraries.designsystem.theme.components.Text
+
+@Composable
+fun MessagesReactionButton(reaction: AggregatedReaction, modifier: Modifier = Modifier) {
+    Surface(
+        modifier = modifier,
+        color = MaterialTheme.colorScheme.surfaceVariant,
+        border = BorderStroke(2.dp, MaterialTheme.colorScheme.background),
+        shape = RoundedCornerShape(corner = CornerSize(12.dp)),
+    ) {
+        Row(
+            modifier = Modifier.padding(vertical = 5.dp, horizontal = 8.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            // TODO `reaction.isHighlighted` is not used.
+            Text(text = reaction.key, fontSize = 12.sp)
+            Spacer(modifier = Modifier.width(4.dp))
+            Text(text = reaction.count, color = MaterialTheme.colorScheme.secondary, fontSize = 12.sp)
+        }
+    }
+}
+
+@Preview
+@Composable
+internal fun MessagesReactionButtonLightPreview(@PreviewParameter(AggregatedReactionProvider::class) reaction: AggregatedReaction) =
+    ElementPreviewLight { ContentToPreview(reaction) }
+
+@Preview
+@Composable
+internal fun MessagesReactionButtonDarkPreview(@PreviewParameter(AggregatedReactionProvider::class) reaction: AggregatedReaction) =
+    ElementPreviewDark { ContentToPreview(reaction) }
+
+@Composable
+private fun ContentToPreview(reaction: AggregatedReaction) {
+    MessagesReactionButton(reaction)
+}

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

@@ -20,7 +20,11 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Warning
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.tooling.preview.Preview
 import io.element.android.features.messages.timeline.model.content.TimelineItemEncryptedContent
+import io.element.android.libraries.designsystem.preview.ElementPreviewDark
+import io.element.android.libraries.designsystem.preview.ElementPreviewLight
+import org.matrix.rustcomponents.sdk.EncryptedMessage
 
 @Composable
 fun TimelineItemEncryptedView(
@@ -34,3 +38,22 @@ fun TimelineItemEncryptedView(
         modifier = modifier
     )
 }
+
+@Preview
+@Composable
+internal fun TimelineItemEncryptedViewLightPreview() =
+    ElementPreviewLight { ContentToPreview() }
+
+@Preview
+@Composable
+internal fun TimelineItemEncryptedViewDarkPreview() =
+    ElementPreviewDark { ContentToPreview() }
+
+@Composable
+private fun ContentToPreview() {
+    TimelineItemEncryptedView(
+        content = TimelineItemEncryptedContent(
+            encryptedMessage = EncryptedMessage.Unknown,
+        )
+    )
+}

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

@@ -28,9 +28,15 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.painter.ColorPainter
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.tooling.preview.PreviewParameter
 import coil.compose.AsyncImage
 import coil.request.ImageRequest
 import io.element.android.features.messages.timeline.model.content.TimelineItemImageContent
+import io.element.android.features.messages.timeline.model.content.TimelineItemImageContentProvider
+import io.element.android.libraries.designsystem.preview.ElementPreviewDark
+import io.element.android.libraries.designsystem.preview.ElementPreviewLight
+import io.element.android.libraries.designsystem.preview.debugPlaceholderBackground
 
 @Composable
 fun TimelineItemImageView(
@@ -48,7 +54,7 @@ fun TimelineItemImageView(
             .aspectRatio(content.aspectRatio),
         contentAlignment = Alignment.Center,
     ) {
-        var isLoading = rememberSaveable(content.imageMeta) { mutableStateOf(true) }
+        val isLoading = rememberSaveable(content.imageMeta) { mutableStateOf(true) }
         val context = LocalContext.current
         val model = ImageRequest.Builder(context)
             .data(content.imageMeta)
@@ -57,9 +63,24 @@ fun TimelineItemImageView(
         AsyncImage(
             model = model,
             contentDescription = null,
-            placeholder = ColorPainter(MaterialTheme.colorScheme.surfaceVariant),
+            placeholder = debugPlaceholderBackground(ColorPainter(MaterialTheme.colorScheme.surfaceVariant)),
             contentScale = ContentScale.Crop,
             onSuccess = { isLoading.value = false },
         )
     }
 }
+
+@Preview
+@Composable
+internal fun TimelineItemImageViewLightPreview(@PreviewParameter(TimelineItemImageContentProvider::class) content: TimelineItemImageContent) =
+    ElementPreviewLight { ContentToPreview(content) }
+
+@Preview
+@Composable
+internal fun TimelineItemImageViewDarkPreview(@PreviewParameter(TimelineItemImageContentProvider::class) content: TimelineItemImageContent) =
+    ElementPreviewDark { ContentToPreview(content) }
+
+@Composable
+private fun ContentToPreview(content: TimelineItemImageContent) {
+    TimelineItemImageView(content)
+}

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

@@ -65,11 +65,11 @@ fun TimelineItemInformativeView(
 
 @Preview
 @Composable
-internal fun MatrixUserRowLightPreview() = ElementPreviewLight { ContentToPreview() }
+internal fun TimelineItemInformativeViewLightPreview() = ElementPreviewLight { ContentToPreview() }
 
 @Preview
 @Composable
-internal fun MatrixUserRowDarkPreview() = ElementPreviewDark { ContentToPreview() }
+internal fun TimelineItemInformativeViewDarkPreview() = ElementPreviewDark { ContentToPreview() }
 
 @Composable
 private fun ContentToPreview() {

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

@@ -16,24 +16,16 @@
 
 package io.element.android.features.messages.timeline.components
 
-import androidx.compose.foundation.BorderStroke
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.width
-import androidx.compose.foundation.shape.CornerSize
-import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
-import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
-import androidx.compose.ui.unit.sp
 import com.google.accompanist.flowlayout.FlowRow
-import io.element.android.features.messages.timeline.model.AggregatedReaction
+import io.element.android.features.messages.timeline.model.AggregatedReactionProvider
 import io.element.android.features.messages.timeline.model.TimelineItemReactions
-import io.element.android.libraries.designsystem.theme.components.Surface
-import io.element.android.libraries.designsystem.theme.components.Text
+import io.element.android.libraries.designsystem.preview.ElementPreviewDark
+import io.element.android.libraries.designsystem.preview.ElementPreviewLight
+import kotlinx.collections.immutable.toPersistentList
 
 @Composable
 fun TimelineItemReactionsView(
@@ -52,21 +44,22 @@ fun TimelineItemReactionsView(
     }
 }
 
+@Preview
 @Composable
-fun MessagesReactionButton(reaction: AggregatedReaction, modifier: Modifier = Modifier) {
-    Surface(
-        modifier = modifier,
-        color = MaterialTheme.colorScheme.surfaceVariant,
-        border = BorderStroke(2.dp, MaterialTheme.colorScheme.background),
-        shape = RoundedCornerShape(corner = CornerSize(12.dp)),
-    ) {
-        Row(
-            modifier = Modifier.padding(vertical = 5.dp, horizontal = 8.dp),
-            verticalAlignment = Alignment.CenterVertically
-        ) {
-            Text(text = reaction.key, fontSize = 12.sp)
-            Spacer(modifier = Modifier.width(4.dp))
-            Text(text = reaction.count, color = MaterialTheme.colorScheme.secondary, fontSize = 12.sp)
-        }
-    }
+internal fun TimelineItemReactionsViewLightPreview() =
+    ElementPreviewLight { ContentToPreview() }
+
+@Preview
+@Composable
+internal fun TimelineItemReactionsViewDarkPreview() =
+    ElementPreviewDark { ContentToPreview() }
+
+@Composable
+private fun ContentToPreview() {
+    TimelineItemReactionsView(
+        reactionsState = TimelineItemReactions(
+            // Use values from AggregatedReactionProvider
+            reactions = AggregatedReactionProvider().values.toPersistentList()
+        )
+    )
 }

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

@@ -20,7 +20,10 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Delete
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.tooling.preview.Preview
 import io.element.android.features.messages.timeline.model.content.TimelineItemRedactedContent
+import io.element.android.libraries.designsystem.preview.ElementPreviewDark
+import io.element.android.libraries.designsystem.preview.ElementPreviewLight
 
 @Composable
 fun TimelineItemRedactedView(
@@ -34,3 +37,18 @@ fun TimelineItemRedactedView(
         modifier = modifier
     )
 }
+
+@Preview
+@Composable
+internal fun TimelineItemRedactedViewLightPreview() =
+    ElementPreviewLight { ContentToPreview() }
+
+@Preview
+@Composable
+internal fun TimelineItemRedactedViewDarkPreview() =
+    ElementPreviewDark { ContentToPreview() }
+
+@Composable
+private fun ContentToPreview() {
+    TimelineItemRedactedView(TimelineItemRedactedContent)
+}

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

@@ -20,7 +20,10 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Info
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.tooling.preview.Preview
 import io.element.android.features.messages.timeline.model.content.TimelineItemUnknownContent
+import io.element.android.libraries.designsystem.preview.ElementPreviewDark
+import io.element.android.libraries.designsystem.preview.ElementPreviewLight
 
 @Composable
 fun TimelineItemUnknownView(
@@ -34,3 +37,18 @@ fun TimelineItemUnknownView(
         modifier = modifier
     )
 }
+
+@Preview
+@Composable
+internal fun TimelineItemUnknownViewLightPreview() =
+    ElementPreviewLight { ContentToPreview() }
+
+@Preview
+@Composable
+internal fun TimelineItemUnknownViewDarkPreview() =
+    ElementPreviewDark { ContentToPreview() }
+
+@Composable
+private fun ContentToPreview() {
+    TimelineItemUnknownView(TimelineItemUnknownContent)
+}

features/messages/src/main/kotlin/io/element/android/features/messages/timeline/model/AggregatedReactionProvider.kt

@@ -0,0 +1,35 @@
+/*
+ * 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.timeline.model
+
+import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+
+open class AggregatedReactionProvider : PreviewParameterProvider<AggregatedReaction> {
+    override val values: Sequence<AggregatedReaction>
+        get() = sequenceOf(
+            aAggregatedReaction(),
+            aAggregatedReaction().copy(count = "88"),
+            aAggregatedReaction().copy(isHighlighted = true),
+            aAggregatedReaction().copy(count = "88", isHighlighted = true),
+        )
+}
+
+fun aAggregatedReaction() = AggregatedReaction(
+    key = "👍",
+    count = "1", // TODO Why is it a String?
+    isHighlighted = false,
+)

features/messages/src/main/kotlin/io/element/android/features/messages/timeline/model/content/TimelineItemImageContentProvider.kt

@@ -0,0 +1,36 @@
+/*
+ * 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.timeline.model.content
+
+import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+import io.element.android.libraries.matrix.media.MediaResolver
+
+open class TimelineItemImageContentProvider : PreviewParameterProvider<TimelineItemImageContent> {
+    override val values: Sequence<TimelineItemImageContent>
+        get() = sequenceOf(
+            aTimelineItemImageContent(),
+            aTimelineItemImageContent().copy(aspectRatio = 1.0f),
+            aTimelineItemImageContent().copy(aspectRatio = 1.5f),
+        )
+}
+
+fun aTimelineItemImageContent() = TimelineItemImageContent(
+    body = "a body",
+    imageMeta = MediaResolver.Meta(source = null, kind = MediaResolver.Kind.Content),
+    blurhash = null,
+    aspectRatio = 0.5f,
+)

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/preview/Images.kt

@@ -18,6 +18,7 @@ package io.element.android.libraries.designsystem.preview
 
 import androidx.annotation.DrawableRes
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.graphics.painter.Painter
 import androidx.compose.ui.platform.LocalInspectionMode
 import androidx.compose.ui.res.painterResource
 import io.element.android.libraries.designsystem.R
@@ -27,14 +28,21 @@ import io.element.android.libraries.designsystem.R
  * but it does not render in preview. In the meantime, you can use this trick to have image.
  */
 @Composable
-fun debugPlaceholder(@DrawableRes debugPreview: Int) = if (LocalInspectionMode.current) {
+fun debugPlaceholder(
+    @DrawableRes debugPreview: Int,
+    nonDebugPainter: Painter? = null,
+) = if (LocalInspectionMode.current) {
     painterResource(id = debugPreview)
 } else {
-    null
+    nonDebugPainter
 }
 
 @Composable
-fun debugPlaceholderBackground() = debugPlaceholder(debugPreview = R.drawable.sample_background)
+fun debugPlaceholderBackground(nonDebugPainter: Painter? = null): Painter? {
+    return debugPlaceholder(debugPreview = R.drawable.sample_background, nonDebugPainter)
+}
 
 @Composable
-fun debugPlaceholderAvatar() = debugPlaceholder(debugPreview = R.drawable.sample_avatar)
+fun debugPlaceholderAvatar(nonDebugPainter: Painter? = null): Painter? {
+    return debugPlaceholder(debugPreview = R.drawable.sample_avatar, nonDebugPainter)
+}

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/MatrixUserRow.kt

@@ -89,12 +89,12 @@ fun MatrixUserRow(
 
 @Preview
 @Composable
-fun MatrixUserRowLightPreview(@PreviewParameter(MatrixUserProvider::class) matrixUser: MatrixUser) =
+internal fun MatrixUserRowLightPreview(@PreviewParameter(MatrixUserProvider::class) matrixUser: MatrixUser) =
     ElementPreviewLight { ContentToPreview(matrixUser) }
 
 @Preview
 @Composable
-fun MatrixUserRowDarkPreview(@PreviewParameter(MatrixUserProvider::class) matrixUser: MatrixUser) =
+internal fun MatrixUserRowDarkPreview(@PreviewParameter(MatrixUserProvider::class) matrixUser: MatrixUser) =
     ElementPreviewDark { ContentToPreview(matrixUser) }
 
 @Composable