feat: collapsible task list sections (#91)

app/src/main/java/de/jeanlucmakiola/agendula/data/prefs/SettingsPrefs.kt

@@ -15,6 +15,7 @@ import de.jeanlucmakiola.agendula.domain.Task
 import de.jeanlucmakiola.agendula.domain.TaskFilter
 import de.jeanlucmakiola.agendula.domain.TaskFormField
 import de.jeanlucmakiola.agendula.domain.TaskReminder
+import de.jeanlucmakiola.agendula.domain.TaskSection
 import de.jeanlucmakiola.agendula.domain.asTaskReminder
 import de.jeanlucmakiola.agendula.domain.asReminderLead
 import de.jeanlucmakiola.agendula.domain.TaskSortOrder
@@ -43,6 +44,7 @@ fun TimeFormatPref.is24Hour(systemIs24Hour: Boolean): Boolean = when (this) {
 }
 
 const val DEFAULT_SNOOZE_MINUTES = 10
+/** Done starts folded away, to keep the open tasks in focus. */ val DEFAULT_COLLAPSED_SECTIONS: Set<TaskSection> = setOf(TaskSection.COMPLETED)
 
 /** The snooze lengths Settings offers. */
 val SNOOZE_PRESETS = listOf(5, 10, 15, 30, 60)
@@ -103,6 +105,8 @@ data class Settings(
     val hiddenFromSmartLists: Set<Long> = emptySet(),
     /** Pre-fill a new task's start with today's date. */
     val defaultStartToday: Boolean = false,
+    /** Task-list sections folded away; Done starts folded. */
+    val collapsedSections: Set<TaskSection> = DEFAULT_COLLAPSED_SECTIONS,
 ) {
     /** [tasks] as [filter] shows them: a smart list drops the lists kept out of it. */
     fun visibleIn(filter: TaskFilter, tasks: List<Task>): List<Task> =
@@ -168,9 +172,18 @@ class SettingsPrefs @Inject constructor(
                     .toSet()
             },
             defaultStartToday = p[DEFAULT_START_TODAY] ?: false,
+            collapsedSections = p[COLLAPSED_SECTIONS]
+                ?.mapNotNull { name -> runCatching { TaskSection.valueOf(name) }.getOrNull() }
+                ?.toSet()
+                ?: DEFAULT_COLLAPSED_SECTIONS,
         )
     }
 
+    suspend fun setSectionCollapsed(section: TaskSection, collapsed: Boolean) = dataStore.edit { p ->
+        val current = p[COLLAPSED_SECTIONS] ?: DEFAULT_COLLAPSED_SECTIONS.mapTo(HashSet()) { it.name }
+        p[COLLAPSED_SECTIONS] = if (collapsed) current + section.name else current - section.name
+    }
+
     suspend fun setSortOrder(order: TaskSortOrder) = dataStore.edit { it[SORT_ORDER] = order.name }
 
     suspend fun setSnoozeMinutes(minutes: Int) = dataStore.edit { it[SNOOZE_MINUTES] = minutes.coerceAtLeast(1) }
@@ -328,6 +341,7 @@ class SettingsPrefs @Inject constructor(
         val PUSH_ENABLED = booleanPreferencesKey("push_enabled")
         val SMART_LIST_HIDDEN = stringSetPreferencesKey("smart_list_hidden")
         val DEFAULT_START_TODAY = booleanPreferencesKey("default_start_today")
+        val COLLAPSED_SECTIONS = stringSetPreferencesKey("collapsed_sections")
         val SAVED_FILTERS = stringPreferencesKey("saved_filters")
         val SAVED_FILTER_NEXT_ID = longPreferencesKey("saved_filter_next_id")
     }

app/src/main/java/de/jeanlucmakiola/agendula/ui/tasklist/TaskListScreen.kt

@@ -371,8 +371,6 @@ private fun TaskListBody(
     // rows; inside a single real list both are redundant.
     val showListName = filter is TaskFilter.Smart || filter is TaskFilter.Tagged ||
         (filter is TaskFilter.Saved && state.savedFilter?.listIds?.size != 1)
-    // Completed tasks collapse away by default to keep the active list in focus.
-    var completedExpanded by rememberSaveable { mutableStateOf(false) }
     // Parents the user expanded to reveal their subtasks inline. Children are
     // grouped from the same flat task set the list already holds.
     var expandedParents by rememberSaveable { mutableStateOf(emptySet<Long>()) }
@@ -420,23 +418,20 @@ private fun TaskListBody(
         }
 
         sections.forEach { section ->
-            val collapsible = showHeaders && section.section == TaskSection.COMPLETED
+            // Every header folds its section away (#91); Done starts folded.
+            val expanded = !showHeaders || section.section !in state.collapsedSections
             if (showHeaders) {
                 stickyHeader(key = "hdr-${section.section}") {
-                    if (collapsible) {
-                        CollapsibleSectionHeader(
-                            label = sectionLabel(section.section),
-                            count = section.tasks.size,
-                            expanded = completedExpanded,
-                            onToggle = { completedExpanded = !completedExpanded },
-                            onClear = onClearCompleted,
-                        )
-                    } else {
-                        SectionHeader(sectionLabel(section.section))
-                    }
+                    CollapsibleSectionHeader(
+                        label = sectionLabel(section.section),
+                        count = section.tasks.size,
+                        expanded = expanded,
+                        onToggle = { viewModel.setSectionCollapsed(section.section, expanded) },
+                        onClear = onClearCompleted.takeIf { section.section == TaskSection.COMPLETED },
+                    )
                 }
             }
-            if (!collapsible || completedExpanded) {
+            if (expanded) {
                 // Flatten the section into one grouped run: each parent, followed
                 // by its subtasks when expanded. Each row's corners then come from
                 // its place in the whole run (positionOf below) — so the children
@@ -1127,19 +1122,6 @@ private fun cardShape(position: Position, full: androidx.compose.ui.unit.Dp, sma
         Position.Bottom -> RoundedCornerShape(topStart = small, topEnd = small, bottomStart = full, bottomEnd = full)
     }
 
-@Composable
-private fun SectionHeader(text: String) {
-    // Opaque surface so rows scroll cleanly under the pinned header.
-    Surface(color = MaterialTheme.colorScheme.surface, modifier = Modifier.fillMaxWidth()) {
-        Text(
-            text = text,
-            style = MaterialTheme.typography.titleSmall,
-            color = MaterialTheme.colorScheme.onSurfaceVariant,
-            modifier = Modifier.padding(start = 28.dp, end = 28.dp, top = 16.dp, bottom = 8.dp),
-        )
-    }
-}
-
 /** A tappable section header with a count and a chevron that rotates on expand. */
 @Composable
 private fun CollapsibleSectionHeader(

app/src/main/java/de/jeanlucmakiola/agendula/ui/tasklist/TaskListViewModel.kt

@@ -3,6 +3,7 @@ package de.jeanlucmakiola.agendula.ui.tasklist
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
+import de.jeanlucmakiola.agendula.data.prefs.DEFAULT_COLLAPSED_SECTIONS
 import de.jeanlucmakiola.agendula.data.prefs.SettingsPrefs
 import de.jeanlucmakiola.agendula.data.sync.RemoteLists
 import de.jeanlucmakiola.agendula.data.tasks.TasksRepository
@@ -14,6 +15,7 @@ import de.jeanlucmakiola.agendula.domain.TaskFiltering
 import de.jeanlucmakiola.agendula.domain.tagsInUse
 import de.jeanlucmakiola.agendula.domain.TaskForm
 import de.jeanlucmakiola.agendula.domain.TaskList
+import de.jeanlucmakiola.agendula.domain.TaskSection
 import de.jeanlucmakiola.agendula.domain.TaskSortOrder
 import de.jeanlucmakiola.agendula.domain.comparator
 import de.jeanlucmakiola.agendula.ui.lists.ListWriteFailure
@@ -56,6 +58,8 @@ sealed interface TaskListUiState {
         /** Whether a real list uses the bottom quick-add bar instead of the FAB. */
         val bottomAddBar: Boolean = false,
         val sortOrder: TaskSortOrder = TaskSortOrder.DUE,
+        /** Sections whose rows are folded under their header. */
+        val collapsedSections: Set<TaskSection> = DEFAULT_COLLAPSED_SECTIONS,
         /** This real list is kept out of the smart lists. */
         val hiddenFromSmartLists: Boolean = false,
         /** Tags the unnarrowed view carries, offered as filter chips. */
@@ -144,6 +148,7 @@ class TaskListViewModel @Inject constructor(
                             showAddSubtaskRow = settings.showAddSubtaskRow,
                             bottomAddBar = settings.bottomAddBar,
                             sortOrder = settings.sortOrder,
+                            collapsedSections = settings.collapsedSections,
                             hiddenFromSmartLists = st.list?.id?.let { it in settings.hiddenFromSmartLists } ?: false,
                         )
                     } else {
@@ -277,6 +282,9 @@ class TaskListViewModel @Inject constructor(
     fun setHiddenFromSmartLists(listId: Long, hidden: Boolean) =
         viewModelScope.launch { settingsPrefs.setHiddenFromSmartLists(listId, hidden) }
 
+    fun setSectionCollapsed(section: TaskSection, collapsed: Boolean) =
+        viewModelScope.launch { settingsPrefs.setSectionCollapsed(section, collapsed) }
+
     fun setSortOrder(order: TaskSortOrder) = viewModelScope.launch { settingsPrefs.setSortOrder(order) }
 
     /**