Preserve log position when collapsing rows

app/src/main/java/se/ajpanton/notificationlog/EventSettingsFragment.kt

@@ -96,7 +96,7 @@ class FilterAppsFragment : Fragment(R.layout.fragment_event_settings) {
 
     private fun updateRuleLabels(rule: AppFilterSettings) {
         binding!!.appRuleToggle.text = modeLabel(rule.mode)
-        binding!!.onlySeenToggle.text = "Show only seen and checked apps"
+        binding!!.onlySeenToggle.text = "Show only seen and edited apps"
         binding!!.seenFirstToggle.text = "Show seen apps first"
     }
 

app/src/main/java/se/ajpanton/notificationlog/ViewLogsFragment.kt

@@ -21,6 +21,7 @@ import se.ajpanton.notificationlog.settings.DisplayEvent
 import java.text.DateFormat
 import java.util.Date
 import androidx.fragment.app.Fragment
+import androidx.core.view.children
 
 class ViewLogsFragment : Fragment(R.layout.fragment_view_logs) {
     private var binding: FragmentViewLogsBinding? = null
@@ -107,9 +108,12 @@ class ViewLogsFragment : Fragment(R.layout.fragment_view_logs) {
             val metadata = metadataValues(row.entry, settings)
             val contents = fieldValue(LogField.CONTENTS, row.entry, settings)
             val hasContents = LogField.CONTENTS in settings.visibleFields && !contents.isNullOrEmpty()
+            val collapseAnchor = if (expanded) captureCollapseAnchor(this@apply) else null
             val toggleExpanded = {
                 if (!expandedIds.add(row.entry.id)) expandedIds.remove(row.entry.id)
                 renderExpanded(row.entry.id in expandedIds)
+                collapseAnchor?.let(::restoreCollapseAnchor)
+                Unit
             }
             val metadataPill = metadataPill(metadata, expanded, toggleExpanded, row.entry.id).apply {
                 layoutParams = LinearLayout.LayoutParams(
@@ -293,6 +297,45 @@ class ViewLogsFragment : Fragment(R.layout.fragment_view_logs) {
         }
     }
 
+    private fun captureCollapseAnchor(collapsingRow: View): CollapseAnchor {
+        val currentBinding = binding ?: return CollapseAnchor.NONE
+        val scroll = currentBinding.logScroll
+        val rowsTop = currentBinding.logRows.top
+        val topEdge = scroll.scrollY - rowsTop
+        val bottomEdge = topEdge + scroll.height
+        val topRow = rowAt(currentBinding.logRows, topEdge)
+        val bottomRow = rowAt(currentBinding.logRows, bottomEdge)
+        return when {
+            topRow === collapsingRow && bottomRow === collapsingRow -> CollapseAnchor.CENTER_COLLAPSED_ROW(collapsingRow)
+            topRow === collapsingRow && bottomRow != null ->
+                CollapseAnchor.KEEP_BOTTOM_EDGE(bottomRow, bottomRow.bottom - bottomEdge)
+            bottomRow === collapsingRow && topRow != null ->
+                CollapseAnchor.KEEP_TOP_EDGE(topRow, topEdge - topRow.top)
+            else -> CollapseAnchor.NONE
+        }
+    }
+
+    private fun restoreCollapseAnchor(anchor: CollapseAnchor) {
+        val currentBinding = binding ?: return
+        val scroll = currentBinding.logScroll
+        val rows = currentBinding.logRows
+        rows.post {
+            if (binding !== currentBinding) return@post
+            val target = when (anchor) {
+                CollapseAnchor.NONE -> return@post
+                is CollapseAnchor.CENTER_COLLAPSED_ROW -> rows.top + anchor.row.top + anchor.row.height / 2 - scroll.height / 2
+                is CollapseAnchor.KEEP_TOP_EDGE -> rows.top + anchor.row.top + anchor.offset
+                is CollapseAnchor.KEEP_BOTTOM_EDGE -> rows.top + anchor.row.bottom - anchor.offset - scroll.height
+            }
+            val maximum = (scroll.getChildAt(0).height - scroll.height).coerceAtLeast(0)
+            scroll.scrollTo(0, target.coerceIn(0, maximum))
+        }
+    }
+
+    private fun rowAt(rows: LinearLayout, edge: Int): View? = rows.children.firstOrNull { row ->
+        edge >= row.top && edge <= row.bottom
+    }
+
     private fun dp(value: Int): Int = (value * resources.displayMetrics.density).toInt()
 
     private data class LogRow(val entry: NotificationLogEntry)
@@ -304,6 +347,13 @@ class ViewLogsFragment : Fragment(R.layout.fragment_view_logs) {
         val breakBeforePeriods: Boolean = false,
     )
 
+    private sealed interface CollapseAnchor {
+        data object NONE : CollapseAnchor
+        data class CENTER_COLLAPSED_ROW(val row: View) : CollapseAnchor
+        data class KEEP_TOP_EDGE(val row: View, val offset: Int) : CollapseAnchor
+        data class KEEP_BOTTOM_EDGE(val row: View, val offset: Int) : CollapseAnchor
+    }
+
     private companion object {
         const val LEFT_PILL_WEIGHT = 0.42f
         const val RIGHT_PILL_WEIGHT = 0.58f

app/src/main/java/se/ajpanton/notificationlog/settings/CaptureSettingsStore.kt

@@ -8,7 +8,7 @@ class CaptureSettingsStore(context: Context) {
     private val preferences = context.applicationContext.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE)
 
     var logGroupSummaries: Boolean
-        get() = preferences.getBoolean(LOG_GROUP_SUMMARIES, true)
+        get() = preferences.getBoolean(LOG_GROUP_SUMMARIES, false)
         set(value) = preferences.edit { putBoolean(LOG_GROUP_SUMMARIES, value) }
 
     private companion object {