Feet and inches input and output

closes #145

feature/converter/src/main/java/com/sadellie/unitto/feature/converter/ConverterScreen.kt

@@ -31,6 +31,8 @@ import androidx.compose.animation.fadeOut
 import androidx.compose.animation.shrinkVertically
 import androidx.compose.animation.togetherWith
 import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
@@ -46,6 +48,7 @@ import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.material3.VerticalDivider
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.derivedStateOf
@@ -57,6 +60,7 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.draw.rotate
+import androidx.compose.ui.focus.onFocusEvent
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
@@ -64,6 +68,7 @@ import androidx.compose.ui.text.TextRange
 import androidx.compose.ui.text.input.TextFieldValue
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.sadellie.unitto.core.base.OutputFormat
@@ -81,6 +86,7 @@ import com.sadellie.unitto.core.ui.common.textfield.FormatterSymbols
 import com.sadellie.unitto.core.ui.common.textfield.UnformattedTextField
 import com.sadellie.unitto.core.ui.datetime.formatDateWeekDayMonthYear
 import com.sadellie.unitto.data.common.format
+import com.sadellie.unitto.data.converter.MyUnitIDS
 import com.sadellie.unitto.data.model.UnitGroup
 import com.sadellie.unitto.data.model.unit.AbstractUnit
 import com.sadellie.unitto.feature.converter.components.DefaultKeyboard
@@ -109,6 +115,7 @@ internal fun ConverterRoute(
         deleteDigit = viewModel::deleteTokens,
         clearInput = viewModel::clearInput,
         onCursorChange = viewModel::onCursorChange,
+        onFocusOnInput2 = viewModel::updateFocused,
         onErrorClick = viewModel::updateCurrencyRates,
         addBracket = viewModel::addBracket
     )
@@ -126,6 +133,7 @@ private fun ConverterScreen(
     deleteDigit: () -> Unit,
     clearInput: () -> Unit,
     onCursorChange: (TextRange) -> Unit,
+    onFocusOnInput2: (Boolean) -> Unit,
     onErrorClick: (AbstractUnit) -> Unit,
     addBracket: () -> Unit,
 ) {
@@ -160,6 +168,7 @@ private fun ConverterScreen(
                     modifier = Modifier.padding(it),
                     uiState = uiState,
                     onCursorChange = onCursorChange,
+                    onFocusOnInput2 = onFocusOnInput2,
                     processInput = processInput,
                     deleteDigit = deleteDigit,
                     navigateToLeftScreen = navigateToLeftScreen,
@@ -254,6 +263,7 @@ private fun Default(
     modifier: Modifier,
     uiState: UnitConverterUIState.Default,
     onCursorChange: (TextRange) -> Unit,
+    onFocusOnInput2: (Boolean) -> Unit,
     processInput: (String) -> Unit,
     deleteDigit: () -> Unit,
     navigateToLeftScreen: () -> Unit,
@@ -288,7 +298,9 @@ private fun Default(
         modifier = modifier.fillMaxSize(),
         content1 = { contentModifier ->
             ColumnWithConstraints(modifier = contentModifier) {
-                val textFieldModifier = Modifier.fillMaxWidth().weight(2f)
+                val textFieldModifier = Modifier
+                    .fillMaxWidth()
+                    .weight(2f)
 
                 AnimatedVisibility(
                     visible = lastUpdate != null,
@@ -307,11 +319,56 @@ private fun Default(
                     )
                 }
 
+                if (uiState.unitFrom.id == MyUnitIDS.foot) {
+                    Row(
+                        modifier = textFieldModifier,
+                        horizontalArrangement = Arrangement.spacedBy(8.dp)
+                    ) {
+                        Column(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .weight(1f)
+                        ) {
+                            ExpressionTextField(
+                                modifier = Modifier.fillMaxWidth().weight(1f),
+                                minRatio = 0.7f,
+                                placeholder = Token.Digit._0,
+                                value = uiState.input1,
+                                onCursorChange = onCursorChange,
+                                pasteCallback = processInput,
+                                cutCallback = deleteDigit,
+                                formatterSymbols = uiState.formatterSymbols,
+                            )
+                            AnimatedUnitShortName(stringResource(uiState.unitFrom.shortName))
+                        }
+
+                        VerticalDivider()
+
+                        Column(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .weight(1f)
+                        ) {
+                            ExpressionTextField(
+                                modifier = Modifier.fillMaxWidth().weight(1f)
+                                    .onFocusEvent { state -> onFocusOnInput2(state.hasFocus) },
+                                minRatio = 0.7f,
+                                placeholder = Token.Digit._0,
+                                value = uiState.input2,
+                                onCursorChange = onCursorChange,
+                                pasteCallback = processInput,
+                                cutCallback = deleteDigit,
+                                formatterSymbols = uiState.formatterSymbols,
+                            )
+                            AnimatedUnitShortName(stringResource(R.string.unit_inch_short))
+                        }
+                    }
+                } else {
                     ExpressionTextField(
                         modifier = textFieldModifier,
                         minRatio = 0.7f,
                         placeholder = Token.Digit._0,
-                    value = uiState.input,
+                        value = uiState.input1,
                         onCursorChange = onCursorChange,
                         pasteCallback = processInput,
                         cutCallback = deleteDigit,
@@ -334,6 +391,7 @@ private fun Default(
                         )
                     }
                     AnimatedUnitShortName(stringResource(uiState.unitFrom.shortName))
+                }
 
                 ConverterResultTextField(
                     modifier = textFieldModifier,
@@ -392,6 +450,7 @@ private fun ConverterResultTextField(
             is ConverterResult.Default -> result.value.format(scale, outputFormat)
             is ConverterResult.NumberBase -> result.value.uppercase()
             is ConverterResult.Time -> result.format(mContext, formatterSymbols)
+            is ConverterResult.FootInch -> result.format(mContext, scale, outputFormat, formatterSymbols)
             else -> ""
         }
         mutableStateOf(TextFieldValue(value))
@@ -430,7 +489,9 @@ private fun ConverterResultTextField(
             )
         }
 
-        is ConverterResult.NumberBase, is ConverterResult.Time -> {
+        is ConverterResult.NumberBase,
+        is ConverterResult.Time,
+        is ConverterResult.FootInch -> {
             UnformattedTextField(
                 modifier = modifier,
                 value = resultTextField,
@@ -527,6 +588,7 @@ private fun PreviewConverterScreen() {
         deleteDigit = {},
         clearInput = {},
         onCursorChange = {},
+        onFocusOnInput2 = {},
         onErrorClick = {},
         addBracket = {}
     )

feature/converter/src/main/java/com/sadellie/unitto/feature/converter/ConverterUIState.kt

@@ -24,6 +24,7 @@ import com.sadellie.unitto.core.base.R
 import com.sadellie.unitto.core.base.Token
 import com.sadellie.unitto.core.ui.common.textfield.FormatterSymbols
 import com.sadellie.unitto.core.ui.common.textfield.formatExpression
+import com.sadellie.unitto.data.common.format
 import com.sadellie.unitto.data.common.isEqualTo
 import com.sadellie.unitto.data.common.isGreaterThan
 import com.sadellie.unitto.data.common.isLessThan
@@ -37,7 +38,8 @@ internal sealed class UnitConverterUIState {
     data object Loading : UnitConverterUIState()
 
     data class Default(
-        val input: TextFieldValue = TextFieldValue(),
+        val input1: TextFieldValue,
+        val input2: TextFieldValue,
         val calculation: BigDecimal?,
         val result: ConverterResult,
         val unitFrom: DefaultUnit,
@@ -53,7 +55,7 @@ internal sealed class UnitConverterUIState {
     ) : UnitConverterUIState()
 
     data class NumberBase(
-        val input: TextFieldValue = TextFieldValue(),
+        val input: TextFieldValue,
         val result: ConverterResult,
         val unitFrom: NumberBaseUnit,
         val unitTo: NumberBaseUnit,
@@ -85,6 +87,11 @@ internal sealed class ConverterResult {
         val attosecond: BigDecimal,
     ) : ConverterResult()
 
+    data class FootInch(
+        val foot: BigDecimal,
+        val inch: BigDecimal,
+    ) : ConverterResult()
+
     data object Loading : ConverterResult()
 
     data object Error : ConverterResult()
@@ -128,6 +135,25 @@ internal fun ConverterResult.Time.format(mContext: Context, formatterSymbols: Fo
     return (if (negative) Token.Operator.minus else "") + result.joinToString(" ").ifEmpty { Token.Digit._0 }
 }
 
+internal fun ConverterResult.FootInch.format(
+    mContext: Context,
+    scale: Int,
+    outputFormat: Int,
+    formatterSymbols: FormatterSymbols
+): String {
+    var result = ""
+    result += foot.format(scale, outputFormat).formatExpression(formatterSymbols)
+
+    if (inch.isGreaterThan(BigDecimal.ZERO)) {
+        result += mContext.getString(R.string.unit_foot_short)
+        result += " "
+        result += inch.format(scale, outputFormat).formatExpression(formatterSymbols)
+        result += mContext.getString(R.string.unit_inch_short)
+    }
+
+    return result
+}
+
 internal fun formatTime(
     input: BigDecimal,
 ): ConverterResult.Time {
@@ -202,6 +228,26 @@ internal fun formatTime(
     )
 }
 
+/**
+ * Creates an object for displaying formatted foot and inch output. Units are passed as objects so
+ * that changes in basic units don't require modifying the method. Also this method can't access
+ * units repository directly.
+ *
+ * @param input Input in feet.
+ * @param footUnit Foot unit [DefaultUnit].
+ * @param inchUnit Inch unit [DefaultUnit].
+ * @return Result where decimal places are converter into inches.
+ */
+internal fun formatFootInch(
+    input: BigDecimal,
+    footUnit: DefaultUnit,
+    inchUnit: DefaultUnit
+): ConverterResult.FootInch {
+    val (integral, fractional) = input.divideAndRemainder(BigDecimal.ONE)
+
+    return ConverterResult.FootInch(integral, footUnit.convert(inchUnit, fractional))
+}
+
 private val dayBasicUnit by lazy { BigDecimal("86400000000000000000000") }
 private val hourBasicUnit by lazy { BigDecimal("3600000000000000000000") }
 private val minuteBasicUnit by lazy { BigDecimal("60000000000000000000") }

feature/converter/src/main/java/com/sadellie/unitto/feature/converter/ConverterViewModel.kt

@@ -65,8 +65,11 @@ internal class ConverterViewModel @Inject constructor(
     private val savedStateHandle: SavedStateHandle
 ) : ViewModel() {
 
-    private val converterInputKey = "CONVERTER_INPUT"
+    private val converterInputKey1 = "CONVERTER_INPUT_1"
-    private val _input = MutableStateFlow(savedStateHandle.getTextField(converterInputKey))
+    private val converterInputKey2 = "CONVERTER_INPUT_2"
+    private val _input1 = MutableStateFlow(savedStateHandle.getTextField(converterInputKey1))
+    private val _input2 = MutableStateFlow(savedStateHandle.getTextField(converterInputKey2))
+    private val _focusedOnInput2 = MutableStateFlow(false)
     private val _calculation = MutableStateFlow<BigDecimal?>(null)
     private val _result = MutableStateFlow<ConverterResult>(ConverterResult.Loading)
     private val _unitFrom = MutableStateFlow<AbstractUnit?>(null)
@@ -83,18 +86,20 @@ internal class ConverterViewModel @Inject constructor(
     private var _loadCurrenciesJob: Job? = null
 
     val converterUiState: StateFlow<UnitConverterUIState> = combine(
-        _input,
+        _input1,
+        _input2,
         _calculation,
         _result,
         _unitFrom,
         _unitTo,
         userPrefsRepository.converterPrefs,
         _currenciesState
-    ) { input, calculation, result, unitFrom, unitTo, prefs, currenciesState ->
+    ) { input1, input2, calculation, result, unitFrom, unitTo, prefs, currenciesState ->
         return@combine when {
             (unitFrom is DefaultUnit) and (unitTo is DefaultUnit) -> {
                 UnitConverterUIState.Default(
-                    input = input,
+                    input1 = input1,
+                    input2 = input2,
                     calculation = calculation,
                     result = result,
                     unitFrom = unitFrom as DefaultUnit,
@@ -111,7 +116,7 @@ internal class ConverterViewModel @Inject constructor(
             }
             (unitFrom is NumberBaseUnit) and (unitTo is NumberBaseUnit) -> {
                 UnitConverterUIState.NumberBase(
-                    input = input,
+                    input = input1,
                     result = result,
                     unitFrom = unitFrom as NumberBaseUnit,
                     unitTo = unitTo as NumberBaseUnit,
@@ -134,12 +139,14 @@ internal class ConverterViewModel @Inject constructor(
                 is CurrencyRateUpdateState.Ready, is CurrencyRateUpdateState.Nothing -> {}
             }
 
+            try {
                 when (ui) {
                     is UnitConverterUIState.Default -> {
                         convertDefault(
                             unitFrom = ui.unitFrom,
                             unitTo = ui.unitTo,
-                        input = ui.input,
+                            input1 = ui.input1,
+                            input2 = ui.input2,
                             formatTime = ui.formatTime
                         )
                     }
@@ -152,6 +159,11 @@ internal class ConverterViewModel @Inject constructor(
                     }
                     is UnitConverterUIState.Loading -> {}
                 }
+            } catch (e: Exception) {
+                _result.update { ConverterResult.Default(BigDecimal.ZERO) }
+            }
+
+
             ui
         }
         .stateIn(viewModelScope, UnitConverterUIState.Loading)
@@ -194,7 +206,7 @@ internal class ConverterViewModel @Inject constructor(
     val rightSideUIState = combine(
         _unitFrom,
         _unitTo,
-        _input,
+        _input1,
         _calculation,
         _rightQuery,
         _rightUnits,
@@ -251,30 +263,73 @@ internal class ConverterViewModel @Inject constructor(
         }
     }
 
-    fun addTokens(tokens: String) = _input.update {
+    /**
+     * Change currently focused text field. For feet and inches input
+     *
+     * @param focusOnInput2 `true` if focus is on inches input. `false`if focus on feet input.
+     */
+    fun updateFocused(focusOnInput2: Boolean) = _focusedOnInput2.update { focusOnInput2 }
+
+    fun addTokens(tokens: String) {
+        if (_focusedOnInput2.value) {
+            _input2.update {
                 val newValue = it.addTokens(tokens)
-        savedStateHandle[converterInputKey] = newValue.text
+                savedStateHandle[converterInputKey2] = newValue.text
                 newValue
             }
+        } else {
+            _input1.update {
+                val newValue = it.addTokens(tokens)
+                savedStateHandle[converterInputKey1] = newValue.text
+                newValue
+            }
+        }
+    }
 
-    fun addBracket() = _input.update {
+    fun addBracket() {
+        if (_focusedOnInput2.value) {
+            _input2.update {
                 val newValue = it.addBracket()
-        savedStateHandle[converterInputKey] = newValue.text
+                savedStateHandle[converterInputKey2] = newValue.text
                 newValue
             }
+        } else {
+            _input1.update {
+                val newValue = it.addBracket()
+                savedStateHandle[converterInputKey1] = newValue.text
+                newValue
+            }
+        }
+    }
 
-    fun deleteTokens() = _input.update {
+    fun deleteTokens() {
+        if (_focusedOnInput2.value) {
+            _input2.update {
                 val newValue = it.deleteTokens()
-        savedStateHandle[converterInputKey] = newValue.text
+                savedStateHandle[converterInputKey2] = newValue.text
                 newValue
             }
+        } else {
+            _input1.update {
+                val newValue = it.deleteTokens()
+                savedStateHandle[converterInputKey1] = newValue.text
+                newValue
+            }
+        }
+    }
 
-    fun clearInput() = _input.update {
+    fun clearInput() {
-        savedStateHandle[converterInputKey] = ""
+        _input1.update {
+            savedStateHandle[converterInputKey1] = ""
             TextFieldValue()
         }
+        _input2.update {
+            savedStateHandle[converterInputKey2] = ""
+            TextFieldValue()
+        }
+    }
 
-    fun onCursorChange(selection: TextRange) = _input.update { it.copy(selection = selection) }
+    fun onCursorChange(selection: TextRange) = _input1.update { it.copy(selection = selection) }
 
     fun updateCurrencyRates(unit: AbstractUnit) {
         _loadCurrenciesJob = viewModelScope.launch(Dispatchers.IO) {
@@ -387,31 +442,50 @@ internal class ConverterViewModel @Inject constructor(
     private fun convertDefault(
         unitFrom: DefaultUnit,
         unitTo: DefaultUnit,
-        input: TextFieldValue,
+        input1: TextFieldValue,
+        input2: TextFieldValue,
         formatTime: Boolean,
     ) = viewModelScope.launch(Dispatchers.Default) {
-        val calculated = try {
+        val footInchInput = unitFrom.id == MyUnitIDS.foot
-            Expression(input.text.ifEmpty { Token.Digit._0 }).calculate()
+
+        if (footInchInput) { _calculation.update { null } }
+
+        // Calculate
+        val calculated1 = try {
+            Expression(input1.text.ifEmpty { Token.Digit._0 }).calculate()
         } catch (e: ExpressionException.DivideByZero) {
             _calculation.update { null }
             return@launch
         } catch (e: Exception) {
             return@launch
         }
-        _calculation.update { if (input.text.isExpression()) calculated else null }
+        val calculated2 = try {
-
+            Expression(input2.text.ifEmpty { Token.Digit._0 }).calculate()
-        try {
+        } catch (e: ExpressionException.DivideByZero) {
-            if ((unitFrom.group == UnitGroup.TIME) and (formatTime)) {
+            _calculation.update { null }
-                _result.update { formatTime(calculated.multiply(unitFrom.basicUnit)) }
+            return@launch
-
+        } catch (e: Exception) {
             return@launch
         }
 
-            val conversion = unitFrom.convert(unitTo, calculated)
+        // Update calculation
+        _calculation.update { if (input1.text.isExpression()) calculated1 else null }
 
-            _result.update { ConverterResult.Default(conversion) }
+        // Convert
-        } catch (e: Exception) {
+        var conversion = unitFrom.convert(unitTo, calculated1)
-            _result.update { ConverterResult.Default(BigDecimal.ZERO) }
+        if (footInchInput) {
+            // Converted from second text field too
+            val inches = unitsRepo.getById(MyUnitIDS.inch) as DefaultUnit
+            conversion += inches.convert(unitTo, calculated2)
+        }
+
+        // Update result
+        _result.update {
+            when {
+                (unitFrom.group == UnitGroup.TIME) and (formatTime) -> formatTime(calculated1.multiply(unitFrom.basicUnit))
+                unitTo.id == MyUnitIDS.foot -> formatFootInch(conversion, unitTo, unitsRepo.getById(MyUnitIDS.inch) as DefaultUnit)
+                else -> ConverterResult.Default(conversion)
+            }
         }
     }