Actual text fields for epoch converter

feature/epoch/src/main/java/com/sadellie/unitto/feature/epoch/EpochScreen.kt

@@ -18,24 +18,22 @@
 
 package com.sadellie.unitto.feature.epoch
 
-import androidx.compose.foundation.background
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.text.TextRange
+import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.sadellie.unitto.core.ui.common.UnittoTopAppBar
 import com.sadellie.unitto.core.ui.common.PortraitLandscape
-import com.sadellie.unitto.feature.epoch.component.DateTextField
 import com.sadellie.unitto.feature.epoch.component.EpochKeyboard
 import com.sadellie.unitto.feature.epoch.component.TopPart
-import com.sadellie.unitto.feature.epoch.component.UnixTextField
 
 @Composable
 internal fun EpochRoute(
@@ -57,8 +55,8 @@ internal fun EpochRoute(
 private fun EpochScreen(
     navigateUpAction: () -> Unit,
     uiState: EpochUIState,
-    addSymbol: (String) -> Unit,
-    deleteSymbol: () -> Unit,
+    addSymbol: (String, Int) -> Unit,
+    deleteSymbol: (Int) -> Unit,
     clearSymbols: () -> Unit,
     swap: () -> Unit
 ) {
@@ -66,55 +64,41 @@ private fun EpochScreen(
         title = stringResource(R.string.epoch_converter),
         navigateUpAction = navigateUpAction
     ) { padding ->
+        var selection: TextRange by remember { mutableStateOf(TextRange.Zero) }
+
         PortraitLandscape(
             modifier = Modifier.padding(padding),
-            content1 = {
+            content1 = { topContentModifier ->
                 TopPart(
-                    modifier = it,
-                    swap = swap,
-                    unixToDate = !uiState.dateToUnix,
-                    dateField = {
-                        Column(
-                            modifier = Modifier
-                                .background(MaterialTheme.colorScheme.background)
-                                .animateItemPlacement()
-                        ) {
-                            DateTextField(
-                                modifier = Modifier.fillMaxWidth(),
-                                date = uiState.dateField
-                            )
-                            Text(
-                                text = "date",
-                                modifier = Modifier.fillMaxWidth(),
-                                textAlign = TextAlign.End
-                            )
-                        }
+                    modifier = topContentModifier.padding(horizontal = 8.dp),
+                    dateToUnix = uiState.dateToUnix,
+                    dateValue = uiState.dateField,
+                    unixValue = uiState.unixField,
+                    swap = {
+                        swap()
+                        selection = TextRange.Zero
                     },
-                    unixField = {
-                        Column(
-                            modifier = Modifier
-                                .background(MaterialTheme.colorScheme.background)
-                                .animateItemPlacement()
-                        ) {
-                            UnixTextField(
-                                modifier = Modifier.fillMaxWidth(),
-                                unix = uiState.unixField
-                            )
-                            Text(
-                                text = "unix",
-                                modifier = Modifier.fillMaxWidth(),
-                                textAlign = TextAlign.End
-                            )
-                        }
-                    }
+                    selection = selection,
+                    onCursorChange = { selection = it.selection }
                 )
             },
-            content2 = {
+            content2 = { bottomModifier ->
                 EpochKeyboard(
-                    modifier = it,
-                    addSymbol = addSymbol,
-                    clearSymbols = clearSymbols,
-                    deleteSymbol = deleteSymbol
+                    modifier = bottomModifier,
+                    addSymbol = {
+                        addSymbol(it, selection.start)
+                        selection = TextRange(selection.start + 1)
+                    },
+                    clearSymbols = {
+                        clearSymbols()
+                        selection = TextRange.Zero
+                    },
+                    deleteSymbol = {
+                        if (selection.start != 0) {
+                            deleteSymbol(selection.start - 1)
+                            selection = TextRange(selection.start - 1)
+                        }
+                    }
                 )
             }
         )

feature/epoch/src/main/java/com/sadellie/unitto/feature/epoch/EpochViewModel.kt

@@ -28,6 +28,7 @@ import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.flow.update
+import java.lang.Integer.min
 import javax.inject.Inject
 
 data class EpochUIState(
@@ -68,12 +69,17 @@ class EpochViewModel @Inject constructor() : ViewModel() {
         viewModelScope, SharingStarted.WhileSubscribed(5000L), EpochUIState()
     )
 
-    fun addSymbol(symbol: String) {
+    fun addSymbol(symbol: String, position: Int) {
         val maxSymbols = if (_fromDateToUnix.value) 14 else 10
-        if (_input.value.length < maxSymbols) _input.update { it + symbol }
+        if (_input.value.length >= maxSymbols) return
+        _input.update { it.replaceRange(position, position, symbol) }
     }
 
-    fun deleteSymbol() = _input.update { it.dropLast(1) }
+    fun deleteSymbol(position: Int) {
+        _input.update {
+            it.removeRange(position, min(position + 1, _input.value.length))
+        }
+    }
 
     fun clearSymbols() = _input.update { "" }
 

feature/epoch/src/main/java/com/sadellie/unitto/feature/epoch/component/DateTextField.kt

@@ -1,154 +0,0 @@
-/*
- * Unitto is a unit converter for Android
- * Copyright (c) 2023 Elshan Agaev
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.sadellie.unitto.feature.epoch.component
-
-import androidx.compose.animation.AnimatedContent
-import androidx.compose.animation.SizeTransform
-import androidx.compose.animation.animateColorAsState
-import androidx.compose.animation.fadeIn
-import androidx.compose.animation.fadeOut
-import androidx.compose.animation.slideInVertically
-import androidx.compose.animation.slideOutVertically
-import androidx.compose.animation.with
-import androidx.compose.foundation.horizontalScroll
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.IntrinsicSize
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.rememberScrollState
-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
-import androidx.compose.runtime.setValue
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.tooling.preview.Preview
-import androidx.compose.ui.unit.dp
-import com.sadellie.unitto.core.ui.theme.NumbersTextStyleDisplayMedium
-import com.sadellie.unitto.feature.epoch.R
-import kotlinx.coroutines.delay
-
-@Composable
-fun DateTextField(
-    modifier: Modifier,
-    date: String
-) {
-    val inputWithPadding: String = date.padEnd(14, '0')
-
-    fun inFocus(range: Int): Boolean = date.length > range
-
-    Column(
-        modifier = modifier
-            .height(IntrinsicSize.Min)
-            .horizontalScroll(rememberScrollState()),
-        horizontalAlignment = Alignment.End
-    ) {
-        Row(
-            horizontalArrangement = Arrangement.spacedBy(2.dp)
-        ) {
-            // Hour
-            AnimatedText(text = inputWithPadding[0].toString(), focus = inFocus(0))
-            AnimatedText(text = inputWithPadding[1].toString(), focus = inFocus(1))
-            // Divider
-            SimpleText(text = ":", focus = inFocus(2))
-            // Minute
-            AnimatedText(text = inputWithPadding[2].toString(), focus = inFocus(2))
-            AnimatedText(text = inputWithPadding[3].toString(), focus = inFocus(3))
-            // Divider
-            SimpleText(text = ":", focus = inFocus(4))
-            // Second
-            AnimatedText(text = inputWithPadding[4].toString(), focus = inFocus(4))
-            AnimatedText(text = inputWithPadding[5].toString(), focus = inFocus(5))
-        }
-        Row(
-            horizontalArrangement = Arrangement.spacedBy(2.dp)
-        ) {
-            Row {
-                AnimatedText(text = inputWithPadding[6].toString(), focus = inFocus(6))
-                AnimatedText(text = inputWithPadding[7].toString(), focus = inFocus(7))
-                SimpleText(text = stringResource(R.string.day_short), focus = inFocus(6))
-            }
-            Row {
-                AnimatedText(text = inputWithPadding[8].toString(), focus = inFocus(8))
-                AnimatedText(text = inputWithPadding[9].toString(), focus = inFocus(9))
-                SimpleText(text = stringResource(R.string.month_short), focus = inFocus(8))
-            }
-            Row {
-                AnimatedText(text = inputWithPadding[10].toString(), focus = inFocus(10))
-                AnimatedText(text = inputWithPadding[11].toString(), focus = inFocus(11))
-                AnimatedText(text = inputWithPadding[12].toString(), focus = inFocus(12))
-                AnimatedText(text = inputWithPadding[13].toString(), focus = inFocus(13))
-                SimpleText(text = stringResource(R.string.year_short), focus = inFocus(10))
-            }
-        }
-    }
-}
-
-@Composable
-private fun AnimatedText(text: String, focus: Boolean) {
-    AnimatedContent(
-        targetState = text,
-        transitionSpec = {
-            if (targetState.toInt() > initialState.toInt()) {
-                slideInVertically { height -> height } + fadeIn() with
-                        slideOutVertically { height -> -height } + fadeOut()
-            } else {
-                slideInVertically { height -> -height } + fadeIn() with
-                        slideOutVertically { height -> height } + fadeOut()
-            }.using(
-                SizeTransform(clip = false)
-            )
-        }
-    ) {
-        SimpleText(text = text, focus = focus)
-    }
-}
-
-@Composable
-private fun SimpleText(text: String, focus: Boolean) {
-    val color = animateColorAsState(
-        if (focus) MaterialTheme.colorScheme.onBackground else MaterialTheme.colorScheme.outline
-    )
-    Text(
-        text = text,
-        style = NumbersTextStyleDisplayMedium,
-        color = color.value
-    )
-}
-
-@Preview
-@Composable
-private fun PreviewDateTextField() {
-    var date: String by remember { mutableStateOf("2") }
-
-    DateTextField(modifier = Modifier, date = date)
-
-    LaunchedEffect(Unit) {
-        "3550002011999".forEach {
-            date += it.toString()
-            delay(2500L)
-        }
-    }
-}

feature/epoch/src/main/java/com/sadellie/unitto/feature/epoch/component/DateTextFieldUtils.kt

@@ -0,0 +1,66 @@
+/*
+ * Unitto is a unit converter for Android
+ * Copyright (c) 2023 Elshan Agaev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sadellie.unitto.feature.epoch.component
+
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.text.input.OffsetMapping
+import androidx.compose.ui.text.input.TransformedText
+import androidx.compose.ui.text.input.VisualTransformation
+
+internal object DateVisTrans : VisualTransformation {
+    override fun filter(text: AnnotatedString): TransformedText = TransformedText(
+        text = AnnotatedString(text.text.toDateMask()),
+        offsetMapping = offsetMapping
+    )
+
+    private val offsetMapping = object : OffsetMapping {
+        override fun originalToTransformed(offset: Int): Int {
+            if (offset <= 2) return offset
+            if (offset <= 4) return offset + 1
+            if (offset <= 6) return offset + 2
+            if (offset <= 8) return offset + 3
+            if (offset <= 10) return offset + 4
+            if (offset <= 14) return offset + 5
+            return 20
+        }
+
+        override fun transformedToOriginal(offset: Int): Int {
+            if (offset <= 2) return offset
+            if (offset <= 5) return offset - 1
+            if (offset <= 9) return offset - 2
+            if (offset <= 11) return offset - 3
+            if (offset <= 14) return offset - 4
+            if (offset <= 19) return offset - 5
+            return 14
+        }
+    }
+}
+
+internal fun String.toDateMask(): String {
+    var maskedText = this
+
+    if (maskedText.length > 2) maskedText = maskedText.replaceRange(2, 2, ":")
+    if (maskedText.length > 5) maskedText = maskedText.replaceRange(5, 5, ":")
+    if (maskedText.length > 8) maskedText = maskedText.replaceRange(8, 8, "\n")
+    if (maskedText.length > 10) maskedText = maskedText.replaceRange(11, 11, "d")
+    if (maskedText.length > 13) maskedText = maskedText.replaceRange(14, 14, "m")
+    if (maskedText.length > 18) maskedText = maskedText.replaceRange(19, 19, "y")
+
+    return maskedText
+}

feature/epoch/src/main/java/com/sadellie/unitto/feature/epoch/component/SwapButton.kt

@@ -25,8 +25,6 @@ import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.interaction.collectIsPressedAsState
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
@@ -41,7 +39,10 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
 
 @Composable
-internal fun SwapButton(swap: () -> Unit) {
+internal fun SwapButton(
+    modifier: Modifier,
+    swap: () -> Unit
+) {
     val interactionSource = remember { MutableInteractionSource() }
     val isPressed by interactionSource.collectIsPressedAsState()
     val cornerRadius: Int by animateIntAsState(
@@ -52,9 +53,7 @@ internal fun SwapButton(swap: () -> Unit) {
     Button(
         onClick = swap,
         shape = RoundedCornerShape(cornerRadius),
-        modifier = Modifier
-            .fillMaxWidth()
-            .padding(horizontal = 8.dp),
+        modifier = modifier,
         contentPadding = PaddingValues(vertical = 26.dp, horizontal = 8.dp),
         interactionSource = interactionSource
     ) {

feature/epoch/src/main/java/com/sadellie/unitto/feature/epoch/component/TopPart.kt

@@ -18,37 +18,108 @@
 
 package com.sadellie.unitto.feature.epoch.component
 
+import androidx.compose.animation.Crossfade
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.lazy.LazyColumn
-import androidx.compose.foundation.lazy.LazyItemScope
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.text.BasicTextField
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalTextInputService
+import androidx.compose.ui.text.TextRange
+import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.ui.text.input.VisualTransformation
+import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
+import com.sadellie.unitto.core.ui.theme.NumbersTextStyleDisplayMedium
 
 @Composable
 fun TopPart(
     modifier: Modifier,
-    unixToDate: Boolean,
+    dateToUnix: Boolean,
     swap: () -> Unit,
-    dateField: @Composable() (LazyItemScope.() -> Unit),
-    unixField: @Composable() (LazyItemScope.() -> Unit),
+    dateValue: String,
+    unixValue: String,
+    selection: TextRange,
+    onCursorChange: (TextFieldValue) -> Unit
 ) {
     Column(
         modifier = modifier,
         verticalArrangement = Arrangement.spacedBy(8.dp)
     ) {
-        LazyColumn(
-            verticalArrangement = Arrangement.Bottom
-        ) {
-            if (unixToDate) {
-                item("unix") { unixField() }
-                item("date") { dateField() }
+        Crossfade(dateToUnix) {
+            if (it) {
+                DateUnixTextFields(
+                    fromTextFieldValue = TextFieldValue(text = dateValue, selection = selection),
+                    onCursorChange = onCursorChange,
+                    fromSupportText = "date",
+                    toTextValue = unixValue,
+                    toSupportText = "unix",
+                    visualTransformation = DateVisTrans,
+                    fromPlaceholderText = dateValue.padEnd(14, '0').toDateMask(),
+                    toPlaceholderText = "0"
+                )
             } else {
-                item("date") { dateField() }
-                item("unix") { unixField() }
+                val dateMasked = dateValue.padEnd(14, '0').toDateMask()
+                DateUnixTextFields(
+                    fromTextFieldValue = TextFieldValue(text = unixValue, selection = selection),
+                    onCursorChange = onCursorChange,
+                    fromSupportText = "unix",
+                    toTextValue = dateMasked,
+                    toSupportText = "date",
+                    visualTransformation = VisualTransformation.None,
+                    fromPlaceholderText = if (unixValue.isEmpty()) "0" else "",
+                    toPlaceholderText = dateMasked,
+                )
             }
         }
-        SwapButton(swap)
+        SwapButton(modifier = Modifier.fillMaxWidth(), swap = swap)
+    }
+}
+
+@Composable
+fun DateUnixTextFields(
+    fromTextFieldValue: TextFieldValue,
+    onCursorChange: (TextFieldValue) -> Unit,
+    fromSupportText: String,
+    toTextValue: String,
+    toSupportText: String,
+    visualTransformation: VisualTransformation,
+    fromPlaceholderText: String,
+    toPlaceholderText: String
+) {
+    Column {
+        CompositionLocalProvider(
+            LocalTextInputService provides null
+        ) {
+            BasicTextField(
+                value = fromTextFieldValue,
+                onValueChange = onCursorChange,
+                textStyle = NumbersTextStyleDisplayMedium.copy(textAlign = TextAlign.Start),
+                minLines = 1,
+                maxLines = 2,
+                visualTransformation = visualTransformation,
+                decorationBox = { innerTextField ->
+                    Text(
+                        text = fromPlaceholderText,
+                        minLines = 1,
+                        maxLines = 2,
+                        style = NumbersTextStyleDisplayMedium,
+                        color = MaterialTheme.colorScheme.outline,
+                        textAlign = TextAlign.Start
+                    )
+                    innerTextField()
+                }
+            )
+        }
+        Text(text = fromSupportText)
+        Text(
+            text = toTextValue.ifEmpty { toPlaceholderText },
+            style = NumbersTextStyleDisplayMedium,
+        )
+        Text(text = toSupportText)
     }
 }

feature/epoch/src/main/java/com/sadellie/unitto/feature/epoch/component/UnixTextField.kt

@@ -1,73 +0,0 @@
-/*
- * Unitto is a unit converter for Android
- * Copyright (c) 2023 Elshan Agaev
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.sadellie.unitto.feature.epoch.component
-
-import androidx.compose.animation.AnimatedContent
-import androidx.compose.animation.SizeTransform
-import androidx.compose.animation.fadeIn
-import androidx.compose.animation.fadeOut
-import androidx.compose.animation.slideInVertically
-import androidx.compose.animation.slideOutVertically
-import androidx.compose.animation.with
-import androidx.compose.foundation.horizontalScroll
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.IntrinsicSize
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.rememberScrollState
-import androidx.compose.material3.Text
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.text.style.TextAlign
-import com.sadellie.unitto.core.ui.theme.NumbersTextStyleDisplayMedium
-
-@Composable
-fun UnixTextField(
-    modifier: Modifier,
-    unix: String
-) {
-    Row(
-        modifier = modifier
-            .height(IntrinsicSize.Min)
-            .horizontalScroll(rememberScrollState()),
-        horizontalArrangement = Arrangement.End
-    ) {
-        AnimatedContent(
-            targetState = unix.ifEmpty { "0" },
-            transitionSpec = {
-                if (targetState.toBigDecimal() > initialState.toBigDecimal()) {
-                    slideInVertically { height -> height } + fadeIn() with
-                            slideOutVertically { height -> -height } + fadeOut()
-                } else {
-                    slideInVertically { height -> -height } + fadeIn() with
-                            slideOutVertically { height -> height } + fadeOut()
-                }.using(
-                    SizeTransform(clip = false)
-                )
-            }
-        ) {
-            Text(
-                text = it,
-                modifier = modifier,
-                style = NumbersTextStyleDisplayMedium,
-                textAlign = TextAlign.End
-            )
-        }
-    }
-}

gradle/libs.versions.toml

@@ -10,7 +10,7 @@ androidxTestRunner = "1.5.1"
 androidxTestRules = "1.5.0"
 orgRobolectric = "4.9"
 orgJetbrainsKotlinxCoroutinesTest = "1.6.4"
-androidxCompose = "1.4.0-alpha02"
+androidxCompose = "1.4.0-alpha05"
 androidxComposeCompiler = "1.4.0"
 androidxComposeUi = "1.4.0-alpha05"
 androidxNavigation = "2.5.3"