Content scanner (Element Pro): scan timeline events for unsafe content (#7159)

* Simplify how event content with captions are displayed The caption component will now be added in `TimelineItemEventContentView` instead of separately in each `TimelineItem__View` component * Make sure `CoilMediaFetcher` methods to fetch media throw errors We need to catch them later to check if the content scanner marked some thumbnails or medias as invalid/unsafe in `AsyncImage` instances * Add a `ContentScannerService` that allows us to manually scan a list of medias in an event and then update and store the results The results take the form of `ContentValidationValue`, stored in a `ContentValidationState` instance tied to the event * Create `EventContentValidationCache` to keep the `ContentValidationStates` for events in a room * Expose `EventContentValidationCache` to Compose using `LocalEventContentValidationState` Also add a couple of helper functions to avoid having to manually remember the states * Use the new components to display invalid content in the timeline items * Add `blurhash` to most media items so we can use it while validating the thumbnails/medias * Fix custom layout issues with screenshot and UI tests * Also check the validation state for replied-to events in the composer * Fix and add tests * Handle unrecoverable content validation errors too: display a 'not found' UI * Improve the performance of `EqualWidthColumn` for the single item case * Update screenshots --------- Co-authored-by: ElementBot <android@element.io>
2026-11-02 12:07:28 +00:00 · 2026-07-16 09:59:51 +02:00
parent 56cf00560e
commit 0d03472c60
241 changed files with 2881 additions and 828 deletions
@@ -29,21 +29,32 @@ fun EqualWidthColumn(
 ) {
    SubcomposeLayout(modifier = modifier) { constraints ->
        val measurables = subcompose(0, content).map { it.measure(constraints) }
-        val maxWidth = measurables.maxOf { it.width }
-        val newConstraints = constraints.copy(minWidth = maxWidth)
-        val newMeasurables = if (measurables.all { it.width == maxWidth }) {
-            // Skip re-measuring if all children have the same width
-            measurables
+        if (measurables.isEmpty()) {
+            // No children, so just return a layout with 0 width and height
+            layout(0, 0) {}
+        } else if (measurables.size == 1) {
+            // No need to re-measure if there's only one child
+            val measurable = measurables.first()
+            layout(measurable.width, measurable.height) {
+                measurable.placeRelative(0, 0)
+            }
        } else {
-            // Re-measure with the largest width as the minWidth to have all children constrained to the same width
-            subcompose(1, content).map { it.measure(newConstraints) }
-        }
-        val totalHeight = (newMeasurables.sumOf { it.height } + spacing.toPx() * (newMeasurables.size - 1)).roundToInt()
-        layout(maxWidth, totalHeight) {
-            var yPosition = 0
-            newMeasurables.forEach { measurable ->
-                measurable.placeRelative(0, yPosition)
-                yPosition += measurable.height + spacing.roundToPx()
+            val maxWidth = measurables.maxOf { it.width }
+            val newConstraints = constraints.copy(minWidth = maxWidth)
+            val newMeasurables = if (measurables.all { it.width == maxWidth }) {
+                // Skip re-measuring if all children have the same width
+                measurables
+            } else {
+                // Re-measure with the largest width as the minWidth to have all children constrained to the same width
+                subcompose(1, content).map { it.measure(newConstraints) }
+            }
+            val totalHeight = (newMeasurables.sumOf { it.height } + spacing.toPx() * (newMeasurables.size - 1)).roundToInt()
+            layout(maxWidth, totalHeight) {
+                var yPosition = 0
+                newMeasurables.forEach { measurable ->
+                    measurable.placeRelative(0, yPosition)
+                    yPosition += measurable.height + spacing.roundToPx()
+                }
            }
        }
    }