Collapse empty weeks in date picker

app/src/main/java/com/lukeneedham/videodiary/ui/feature/common/datepicker/DiaryDatePicker.kt

@@ -5,11 +5,17 @@ import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.semantics.contentDescription
+import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.tooling.preview.Preview
+import com.lukeneedham.videodiary.R
 import com.lukeneedham.videodiary.domain.model.Day
 import java.time.DayOfWeek
 import java.time.LocalDate
@@ -34,9 +40,27 @@ fun DiaryDatePicker(
         placeholderDaysStart + week.map { Weekday.Value(it) } + placeholderDaysEnd
     }
 
+    val today = LocalDate.now()
+    val rows = buildList<WeekRow> {
+        var previousWasCollapsed = false
+        weekDays.forEach { week ->
+            val isCurrentWeek = week.any { it is Weekday.Value && it.day.date == today }
+            val isEmpty = week.none { it is Weekday.Value && it.day.video != null }
+            if (!isCurrentWeek && isEmpty) {
+                if (!previousWasCollapsed) {
+                    add(WeekRow.Collapsed)
+                    previousWasCollapsed = true
+                }
+            } else {
+                add(WeekRow.Normal(week))
+                previousWasCollapsed = false
+            }
+        }
+    }
+
     val firstVisibleWeekIndex = remember {
-        val res = weekDays.indexOfFirst { week ->
-            week.any { it is Weekday.Value && it.day.date == initialFocusedDate }
+        val res = rows.indexOfFirst { row ->
+            row is WeekRow.Normal && row.week.any { it is Weekday.Value && it.day.date == initialFocusedDate }
         }
         if (res == -1) 0 else res
     }
@@ -53,30 +77,46 @@ fun DiaryDatePicker(
         state = state,
         modifier = modifier
     ) {
-        items(weekDays) { week ->
-            Row(modifier = Modifier.fillParentMaxWidth()) {
-                week.forEach { weekday ->
-                    Box(
-                        modifier = Modifier
-                            .weight(1f)
-                    ) {
-                        when (weekday) {
-                            is Weekday.Empty -> {
-                                // Nothing
-                            }
+        items(rows) { row ->
+            when (row) {
+                is WeekRow.Normal -> {
+                    Row(modifier = Modifier.fillParentMaxWidth()) {
+                        row.week.forEach { weekday ->
+                            Box(
+                                modifier = Modifier
+                                    .weight(1f)
+                            ) {
+                                when (weekday) {
+                                    is Weekday.Empty -> {
+                                        // Nothing
+                                    }
 
-                            is Weekday.Value -> {
-                                val day = weekday.day
-                                DiaryDatePickerDay(
-                                    day = day,
-                                    onClick = {
-                                        onDateSelected(day.date)
+                                    is Weekday.Value -> {
+                                        val day = weekday.day
+                                        DiaryDatePickerDay(
+                                            day = day,
+                                            onClick = {
+                                                onDateSelected(day.date)
+                                            }
+                                        )
                                     }
-                                )
+                                }
                             }
                         }
                     }
                 }
+
+                is WeekRow.Collapsed -> {
+                    val collapsedDescription = stringResource(R.string.date_picker_collapsed_weeks_description)
+                    Box(
+                        contentAlignment = Alignment.Center,
+                        modifier = Modifier
+                            .fillParentMaxWidth()
+                            .semantics { contentDescription = collapsedDescription }
+                    ) {
+                        Text(text = stringResource(R.string.date_picker_collapsed_weeks))
+                    }
+                }
             }
         }
     }
@@ -87,6 +127,11 @@ private sealed interface Weekday {
     data object Empty : Weekday
 }
 
+private sealed interface WeekRow {
+    data class Normal(val week: List<Weekday>) : WeekRow
+    data object Collapsed : WeekRow
+}
+
 @Preview
 @Composable
 private fun Preview() {

app/src/main/res/values/strings.xml

@@ -1,3 +1,5 @@
 <resources>
     <string name="app_name">Video Diary</string>
+    <string name="date_picker_collapsed_weeks">…</string>
+    <string name="date_picker_collapsed_weeks_description">Empty weeks collapsed</string>
 </resources>