Scorekeeper: show an entered 0, tap a past score to edit it

Zeros are now stored so a typed 0 shows as 0 while a blank cell stays blank.
Tapping a score in an earlier round opens that round for correction with the
cursor in the tapped cell, instead of needing the row number first.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

app/src/main/java/org/prolibertate/games/score/ScoreSheet.kt

@@ -21,9 +21,9 @@ data class ScorePlayer(val id: Int, val name: String = "")
 /**
  * What each player scored in one round, keyed by [ScorePlayer.id].
  *
- * A player absent from the map scored nothing, which is the same as zero — so
+ * A player absent from the map had nothing entered, which counts as zero in the
- * a round where only one person scored carries one entry rather than a column
+ * totals — so a round where only one person scored carries one entry rather
- * of noughts.
+ * than a column of noughts. A 0 that was typed is kept, so it can be shown.
  */
 @Serializable
 data class ScoreRound(val deltas: Map<Int, Int> = emptyMap()) {
@@ -114,12 +114,12 @@ data class ScoreSheet(
     }
 
     /**
-     * A round holding only what is worth storing: entries for players who are
+     * A round holding only entries for players who are still at the table.
-     * still at the table, and only where somebody actually scored.
+     * Zeros stay: a typed 0 is different from a cell left blank.
      */
     private fun roundOf(deltas: Map<Int, Int>): ScoreRound {
         val ids = players.map { it.id }.toSet()
-        return ScoreRound(deltas.filterKeys { it in ids }.filterValues { it != 0 })
+        return ScoreRound(deltas.filterKeys { it in ids })
     }
 
     /** Drops points recorded against anybody no longer at the table. */

app/src/main/java/org/prolibertate/games/ui/ScorekeeperScreen.kt

@@ -42,6 +42,8 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.SolidColor
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
 import androidx.compose.ui.graphics.graphicsLayer
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.platform.LocalDensity
@@ -193,9 +195,21 @@ private fun Sheet(modifier: Modifier, sheet: ScoreSheet, onChange: (ScoreSheet)
     var renaming by remember { mutableStateOf(-1) }
     // Which cell the ± button flips: the last one typed into.
     var lastTyped by remember { mutableStateOf(-1) }
+    // The cell to put the cursor in when a round is opened by tapping it.
+    var focusPlayer by remember { mutableStateOf(-1) }
 
     val editing = if (correcting >= 0) correction else pending
 
+    // Opens a round for correction. Both the round number and any of its cells
+    // come through here, so tapping a score edits that score directly.
+    val startCorrection: (Int, Int) -> Unit = { index, focus ->
+        correcting = index
+        correction.clear()
+        sheet.rounds[index].deltas.forEach { (id, points) -> correction[id] = points.toString() }
+        lastTyped = -1
+        focusPlayer = focus
+    }
+
     // Keep the row being filled in in view when a round is written down.
     LaunchedEffect(sheet.rounds.size) { rows.animateScrollTo(rows.maxValue) }
 
@@ -264,15 +278,7 @@ private fun Sheet(modifier: Modifier, sheet: ScoreSheet, onChange: (ScoreSheet)
                                     if (underCorrection) {
                                         correcting = -1
                                     } else {
-                                        correcting = index
+                                        startCorrection(index, -1)
-                                        correction.clear()
-                                        sheet.players.forEach { player ->
-                                            val points = round.delta(player.id)
-                                            if (points != 0) {
-                                                correction[player.id] = points.toString()
-                                            }
-                                        }
-                                        lastTyped = -1
                                     }
                                 },
                             )
@@ -282,13 +288,17 @@ private fun Sheet(modifier: Modifier, sheet: ScoreSheet, onChange: (ScoreSheet)
                         if (underCorrection) {
                             PointsField(
                                 text = correction[player.id].orEmpty(),
+                                autoFocus = focusPlayer == player.id,
                                 onText = {
                                     correction[player.id] = it
                                     lastTyped = player.id
                                 },
                             )
                         } else {
-                            PointsCell(text = signed(round.delta(player.id)))
+                            PointsCell(
+                                text = signed(round.deltas[player.id]),
+                                onClick = { startCorrection(index, player.id) },
+                            )
                         }
                     }
                 }
@@ -358,17 +368,20 @@ private fun Sheet(modifier: Modifier, sheet: ScoreSheet, onChange: (ScoreSheet)
                     pending.clear()
                 }
                 lastTyped = -1
+                focusPlayer = -1
             },
             onDelete = {
                 onChange(sheet.withoutRound(correcting))
                 correcting = -1
                 correction.clear()
                 lastTyped = -1
+                focusPlayer = -1
             },
             onCancel = {
                 correcting = -1
                 correction.clear()
                 lastTyped = -1
+                focusPlayer = -1
             },
         )
     }
@@ -583,11 +596,12 @@ private fun RoundLabel(text: String, selected: Boolean, onClick: () -> Unit) {
 }
 
 @Composable
-private fun PointsCell(text: String, muted: Boolean = false) {
+private fun PointsCell(text: String, muted: Boolean = false, onClick: (() -> Unit)? = null) {
     Box(
         modifier = Modifier
             .fillMaxSize()
-            .border(Dp.Hairline, MaterialTheme.colorScheme.outlineVariant),
+            .border(Dp.Hairline, MaterialTheme.colorScheme.outlineVariant)
+            .then(if (onClick != null) Modifier.clickable { onClick() } else Modifier),
         contentAlignment = Alignment.Center,
     ) {
         Text(
@@ -603,9 +617,11 @@ private fun PointsCell(text: String, muted: Boolean = false) {
     }
 }
 
-/** A cell being typed into. Blank means nothing scored, which is the same as nought. */
+/** A cell being typed into. Blank means nothing entered; a typed 0 is kept and shown. */
 @Composable
-private fun PointsField(text: String, onText: (String) -> Unit) {
+private fun PointsField(text: String, onText: (String) -> Unit, autoFocus: Boolean = false) {
+    val focus = remember { FocusRequester() }
+    LaunchedEffect(autoFocus) { if (autoFocus) focus.requestFocus() }
     BasicTextField(
         value = text,
         onValueChange = { onText(sanitiseAmount(it)) },
@@ -616,7 +632,7 @@ private fun PointsField(text: String, onText: (String) -> Unit) {
         ),
         cursorBrush = SolidColor(MaterialTheme.colorScheme.primary),
         keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number),
-        modifier = Modifier.fillMaxSize(),
+        modifier = Modifier.fillMaxSize().focusRequester(focus),
         decorationBox = { field ->
             Box(
                 modifier = Modifier
@@ -758,14 +774,13 @@ private fun flipSign(text: String): String {
     return (-value).toString()
 }
 
-/** The typed cells as points. Blanks, a lone minus and noughts all drop out. */
+/** The typed cells as points. Blanks and a lone minus drop out; a typed 0 stays. */
 private fun amountsAsPoints(amounts: Map<Int, String>): Map<Int, Int> =
-    amounts.mapNotNull { (id, text) -> text.toIntOrNull()?.takeIf { it != 0 }?.let { id to it } }
+    amounts.mapNotNull { (id, text) -> text.toIntOrNull()?.let { id to it } }.toMap()
-        .toMap()
 
-/** Nothing scored shows as an empty cell rather than a nought in every column. */
+/** Not entered shows as an empty cell; an entered 0 shows as 0. */
-private fun signed(points: Int): String = when {
+private fun signed(points: Int?): String = when {
+    points == null -> ""
     points > 0 -> "+$points"
-    points < 0 -> points.toString()
+    else -> points.toString()
-    else -> ""
 }

app/src/test/java/org/prolibertate/games/score/ScoreSheetTest.kt

@@ -182,4 +182,13 @@ class ScoreSheetTest {
         assertEquals(0, sheet.totals()[sheet.players[0].id])
         assertEquals(4, sheet.totals()[sheet.players[1].id])
     }
+
+    @Test
+    fun `a zero that was entered is kept, unlike a cell left blank`() {
+        val sheet = sheetOf("Alice", "Bob").let { it.withRound(mapOf(it.players[0].id to 0)) }
+        val round = sheet.rounds.first()
+        assertEquals(0, round.deltas[sheet.players[0].id])
+        assertEquals(null, round.deltas[sheet.players[1].id])
+        assertEquals(0, sheet.total(sheet.players[0].id))
+    }
 }