Refactored units list composables

app/src/main/java/com/sadellie/unitto/data/units/UnitGroup.kt

@@ -1,5 +1,6 @@
 package com.sadellie.unitto.data.units
 
+import androidx.annotation.StringRes
 import com.sadellie.unitto.R
 
 val ALL_UNIT_GROUPS: List<UnitGroup> by lazy {
@@ -10,7 +11,10 @@ val ALL_UNIT_GROUPS: List<UnitGroup> by lazy {
  * As not all measurements can be converted between into other, we separate them into groups.
  * Within one groups all measurements can be converted
  */
-enum class UnitGroup(val res: Int, val canNegate: Boolean = false) {
+enum class UnitGroup(
+    @StringRes val res: Int,
+    val canNegate: Boolean = false
+) {
     LENGTH(res = R.string.length),
     CURRENCY(res = R.string.currency),
     MASS(res = R.string.mass),

app/src/main/java/com/sadellie/unitto/screens/second/SecondScreen.kt

@@ -84,17 +84,17 @@ fun SecondScreen(
                 )
                 UnitsList(
                     groupedUnits = unitsList,
-                    changeAction = { viewModel.changeUnitFrom(it); focusManager.clearFocus(true); navigateUp() },
+                    selectAction = { viewModel.changeUnitFrom(it); focusManager.clearFocus(true); navigateUp() },
                     favoriteAction = { viewModel.favoriteUnit(it) },
                     currentUnit = viewModel.unitFrom,
                 )
             } else {
                 UnitsList(
                     groupedUnits = unitsList,
-                    changeAction = { viewModel.changeUnitTo(it); focusManager.clearFocus(true); navigateUp() },
+                    selectAction = { viewModel.changeUnitTo(it); focusManager.clearFocus(true); navigateUp() },
                     favoriteAction = { viewModel.favoriteUnit(it) },
                     currentUnit = viewModel.unitTo,
-                    inputValue = viewModel.mainUIState.inputValue.toBigDecimal(),
+                    input = viewModel.mainUIState.inputValue.toBigDecimal(),
                     unitFrom = viewModel.unitFrom
                 )
             }

app/src/main/java/com/sadellie/unitto/screens/second/components/UnitListItem.kt

@@ -24,7 +24,6 @@ import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -40,34 +39,29 @@ import com.sadellie.unitto.R
 import com.sadellie.unitto.data.units.AbstractUnit
 
 /**
- * Represents one list item. Once clicked will navigate up
+ * Represents one list item. Once clicked will navigate up.
  *
- * @param modifier Modifier that will be applied to a box that surrounds row.
- * @param changeAction Function to change current unit. Called when choosing unit
- * @param favoriteAction Function to mark unit as favorite. It's a toggle
- * @param item The unit itself
- * @param isSelected Whether this unit is selected or not (current pair of unit)
- * @param convertValue Used for right side units. Shows conversion from unit on the left
+ * @param unit The unit itself.
+ * @param isSelected Whether this unit is selected or not (current pair of unit).
+ * @param selectAction Function to change current unit. Called when choosing unit.
+ * @param favoriteAction Function to mark unit as favorite. It's a toggle.
+ * @param shortNameLabel String on the second line.
  */
 @Composable
-fun UnitListItem(
-    modifier: Modifier,
-    changeAction: (AbstractUnit) -> Unit,
-    favoriteAction: (AbstractUnit) -> Unit,
-    item: AbstractUnit,
+private fun BasicUnitListItem(
+    unit: AbstractUnit,
     isSelected: Boolean,
-    convertValue: (AbstractUnit) -> String
+    selectAction: (AbstractUnit) -> Unit,
+    favoriteAction: (AbstractUnit) -> Unit,
+    shortNameLabel: String
 ) {
-    var isFavorite: Boolean by rememberSaveable { mutableStateOf(item.isFavorite) }
-    var convertedValue: String by remember { mutableStateOf("") }
+    var isFavorite: Boolean by rememberSaveable { mutableStateOf(unit.isFavorite) }
     Box(
-        modifier = modifier
+        modifier = Modifier
             .clickable(
                 interactionSource = remember { MutableInteractionSource() },
                 indication = rememberRipple(), // You can also change the color and radius of the ripple
-                onClick = {
-                    changeAction(item)
-                }
+                onClick = { selectAction(unit) }
             )
             .padding(horizontal = 12.dp)
     ) {
@@ -87,19 +81,19 @@ fun UnitListItem(
                     .weight(1f)
             ) {
                 Text(
-                    text = stringResource(id = item.displayName),
+                    text = stringResource(id = unit.displayName),
                     maxLines = 1,
                     overflow = TextOverflow.Ellipsis
                 )
                 Text(
-                    text = convertedValue + stringResource(id = item.shortName),
+                    text = shortNameLabel,
                     style = MaterialTheme.typography.bodySmall,
                     color = MaterialTheme.colorScheme.onSurfaceVariant,
                     maxLines = 1,
                     overflow = TextOverflow.Ellipsis
                 )
             }
-            IconButton(onClick = { favoriteAction(item); isFavorite = !isFavorite }) {
+            IconButton(onClick = { favoriteAction(unit); isFavorite = !isFavorite }) {
                 AnimatedContent(
                     targetState = isFavorite,
                     transitionSpec = {
@@ -107,15 +101,57 @@ fun UnitListItem(
                     }
                 ) {
                     Icon(
-                        if (item.isFavorite) Icons.Filled.Favorite else Icons.Filled.FavoriteBorder,
+                        if (unit.isFavorite) Icons.Filled.Favorite else Icons.Filled.FavoriteBorder,
                         contentDescription = stringResource(id = R.string.favorite_button_description)
                     )
                 }
             }
         }
     }
-    LaunchedEffect(Unit) {
-        // Converting value
-        convertedValue = convertValue(item)
-    }
 }
+
+/**
+ * Represents one list item. Once clicked will navigate up. Has without conversion.
+ *
+ * @param unit The unit itself.
+ * @param isSelected Whether this unit is selected or not (current pair of unit).
+ * @param selectAction Function to change current unit. Called when choosing unit.
+ * @param favoriteAction Function to mark unit as favorite. It's a toggle.
+ */
+@Composable
+fun UnitListItem(
+    unit: AbstractUnit,
+    isSelected: Boolean,
+    selectAction: (AbstractUnit) -> Unit,
+    favoriteAction: (AbstractUnit) -> Unit,
+) = BasicUnitListItem(
+    unit = unit,
+    isSelected = isSelected,
+    selectAction = selectAction,
+    favoriteAction = favoriteAction,
+    stringResource(id = unit.shortName)
+)
+
+/**
+ * Represents one list item. Once clicked will navigate up. Has with conversion.
+ *
+ * @param unit The unit itself.
+ * @param isSelected Whether this unit is selected or not (current pair of unit).
+ * @param selectAction Function to change current unit. Called when choosing unit.
+ * @param favoriteAction Function to mark unit as favorite. It's a toggle.
+ * @param convertValue Function to call that will convert this unit.
+ */
+@Composable
+fun UnitListItem(
+    unit: AbstractUnit,
+    isSelected: Boolean,
+    selectAction: (AbstractUnit) -> Unit,
+    favoriteAction: (AbstractUnit) -> Unit,
+    convertValue: (AbstractUnit) -> String
+) = BasicUnitListItem(
+    unit = unit,
+    isSelected = isSelected,
+    selectAction = selectAction,
+    favoriteAction = favoriteAction,
+    shortNameLabel = "${convertValue(unit)} ${stringResource(id = unit.shortName)}"
+)

app/src/main/java/com/sadellie/unitto/screens/second/components/UnitsList.kt

@@ -19,22 +19,18 @@ import java.math.BigDecimal
 
 
 /**
- * Component with grouped units
+ * Component with grouped units.
  *
- * @param groupedUnits Grouped [AbstractUnit]s to be listed
- * @param changeAction Action to perform when clicking on a list item
- * @param favoriteAction Action to perform when clicking "favorite" button on list item
- * @param inputValue Current input value. Used for right side screen
- * @param unitFrom Current unit on the left. Used for right side screen
- * @param currentUnit Currently selected unit. Will be visually distinguishable
+ * @param groupedUnits Grouped [AbstractUnit]s to be listed.
+ * @param selectAction Action to perform when clicking on a list item.
+ * @param favoriteAction Action to perform when clicking "favorite" button on list item.
+ * @param currentUnit Currently selected unit. Will be visually distinguishable.
  */
 @Composable
 fun UnitsList(
     groupedUnits: Map<UnitGroup, List<AbstractUnit>>,
-    changeAction: (AbstractUnit) -> Unit,
+    selectAction: (AbstractUnit) -> Unit,
     favoriteAction: (AbstractUnit) -> Unit,
-    inputValue: BigDecimal = BigDecimal.ONE,
-    unitFrom: AbstractUnit? = null,
     currentUnit: AbstractUnit,
 ) {
     LazyColumn(
@@ -42,41 +38,82 @@ fun UnitsList(
         content = {
             if (groupedUnits.isEmpty()) {
                 item { SearchPlaceholder() }
-            } else {
-                groupedUnits.forEach { (unitGroup, listOfUnits) ->
-                    stickyHeader {
-                        Text(
-                            modifier = Modifier
-                                .background(MaterialTheme.colorScheme.background)
-                                .fillMaxWidth()
-                                .padding(vertical = 12.dp, horizontal = 8.dp),
-                            text = stringResource(id = unitGroup.res),
-                            style = MaterialTheme.typography.titleMedium,
-                            color = MaterialTheme.colorScheme.primary
-                        )
-                    }
-                    items(items = listOfUnits, key = { it.unitId }) { unit ->
-                        UnitListItem(
-                            modifier = Modifier,
-                            changeAction = changeAction,
-                            favoriteAction = favoriteAction,
-                            item = unit,
-                            isSelected = currentUnit == unit,
-                            convertValue = {
-                                if (unitFrom != null) {
-                                    Formatter.format(
-                                        unitFrom
-                                            .convert(it, inputValue, 3)
-                                            .toPlainString()
-                                    ).plus(" ")
-                                } else {
-                                    ""
-                                }
-                            }
-                        )
-                    }
+                return@LazyColumn
+            }
+            groupedUnits.forEach { (unitGroup, listOfUnits) ->
+                stickyHeader { Header(text = stringResource(id = unitGroup.res)) }
+                items(items = listOfUnits, key = { it.unitId }) { unit ->
+                    UnitListItem(
+                        unit = unit,
+                        isSelected = currentUnit == unit,
+                        selectAction = selectAction,
+                        favoriteAction = favoriteAction
+                    )
                 }
             }
         }
     )
 }
+
+
+/**
+ * Component with grouped units/
+ *
+ * @param groupedUnits Grouped [AbstractUnit]s to be listed.
+ * @param selectAction Action to perform when clicking on a list item.
+ * @param favoriteAction Action to perform when clicking "favorite" button on list item.
+ * @param currentUnit Currently selected unit. Will be visually distinguishable.
+ * @param unitFrom Unit to convert from. Used for conversion in short name field.
+ * @param input Current input value. Used for conversion in short name field.
+ */
+@Composable
+fun UnitsList(
+    groupedUnits: Map<UnitGroup, List<AbstractUnit>>,
+    selectAction: (AbstractUnit) -> Unit,
+    favoriteAction: (AbstractUnit) -> Unit,
+    currentUnit: AbstractUnit,
+    unitFrom: AbstractUnit,
+    input: BigDecimal
+) {
+    LazyColumn(
+        modifier = Modifier.fillMaxSize(),
+        content = {
+            if (groupedUnits.isEmpty()) {
+                item { SearchPlaceholder() }
+                return@LazyColumn
+            }
+            groupedUnits.forEach { (unitGroup, listOfUnits) ->
+                stickyHeader { Header(text = stringResource(id = unitGroup.res)) }
+                items(items = listOfUnits, key = { it.unitId }) { unit ->
+                    UnitListItem(
+                        unit = unit,
+                        isSelected = currentUnit == unit,
+                        selectAction = selectAction,
+                        favoriteAction = favoriteAction,
+                        convertValue = {
+                            Formatter.format(unitFrom.convert(unit, input, 3).toPlainString())
+                        }
+                    )
+                }
+            }
+        }
+    )
+}
+
+/**
+ * Unit group header.
+ *
+ * @param text Unit group name.
+ */
+@Composable
+private fun Header(text: String) {
+    Text(
+        modifier = Modifier
+            .background(MaterialTheme.colorScheme.background)
+            .fillMaxWidth()
+            .padding(vertical = 12.dp, horizontal = 8.dp),
+        text = text,
+        style = MaterialTheme.typography.titleMedium,
+        color = MaterialTheme.colorScheme.primary
+    )
+}