Timetable hours #151
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| package io.github.droidkaigi.confsched2022.feature.sessions | ||
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| import androidx.compose.foundation.ExperimentalFoundationApi | ||
| import androidx.compose.foundation.layout.width | ||
| import androidx.compose.foundation.lazy.layout.LazyLayout | ||
| import androidx.compose.foundation.lazy.layout.LazyLayoutItemProvider | ||
| import androidx.compose.material3.MaterialTheme | ||
| import androidx.compose.material3.Text | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.State | ||
| import androidx.compose.runtime.derivedStateOf | ||
| import androidx.compose.runtime.getValue | ||
| import androidx.compose.runtime.remember | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.draw.clipToBounds | ||
| import androidx.compose.ui.draw.drawBehind | ||
| import androidx.compose.ui.geometry.Offset | ||
| import androidx.compose.ui.graphics.Color | ||
| import androidx.compose.ui.layout.Placeable | ||
| import androidx.compose.ui.text.style.TextAlign | ||
| import androidx.compose.ui.unit.Constraints | ||
| import androidx.compose.ui.unit.Density | ||
| import androidx.compose.ui.unit.dp | ||
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| @Composable | ||
| fun HoursItem( | ||
| modifier: Modifier = Modifier, | ||
| hour: String | ||
| ) { | ||
| Text( | ||
| text = hour, | ||
| color = Color.White, | ||
| modifier = modifier, | ||
| textAlign = TextAlign.Center | ||
| ) | ||
| } | ||
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| @OptIn(ExperimentalFoundationApi::class) | ||
| @Composable | ||
| fun Hours( | ||
| modifier: Modifier = Modifier, | ||
| timetableState: TimetableState, | ||
| content: @Composable (Modifier, String) -> Unit, | ||
| ) { | ||
| val itemProvider = itemProvider({ hoursList.size }) { index -> | ||
| content(modifier, hoursList[index]) | ||
| } | ||
| val density = timetableState.density | ||
| val scrollState = timetableState.screenScrollState | ||
| val hoursLayout = remember(hoursList) { | ||
| HoursLayout( | ||
| hours = hoursList, | ||
| density = density, | ||
| ) | ||
| } | ||
| val hoursScreen = remember(hoursLayout, density) { | ||
| HoursScreen( | ||
| hoursLayout, | ||
| scrollState, | ||
| density | ||
| ) | ||
| } | ||
| val visibleItemLayouts by remember(hoursScreen) { hoursScreen.visibleItemLayouts } | ||
| val lineColor = MaterialTheme.colorScheme.surfaceVariant | ||
| val linePxSize = with(timetableState.density) { lineStrokeSize.toPx() } | ||
| val lineOffset = with(density) { 67.dp.roundToPx() } | ||
| val lineEnd = with(density) { hoursWidth.roundToPx() } | ||
| LazyLayout( | ||
| modifier = modifier | ||
| .width(hoursWidth) | ||
| .clipToBounds() | ||
| .drawBehind { | ||
| hoursScreen.timeHorizontalLines.value.forEach { | ||
| drawLine( | ||
| lineColor, | ||
| Offset(lineOffset.toFloat(), it), | ||
| Offset(lineEnd.toFloat(), it), | ||
| linePxSize | ||
| ) | ||
| } | ||
| }, | ||
| itemProvider = itemProvider | ||
| ) { constraint -> | ||
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||
| data class ItemData(val placeable: Placeable, val hoursItem: HoursItemLayout) | ||
| hoursScreen.updateBounds(width = constraint.maxWidth, height = constraint.maxHeight) | ||
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| val items = visibleItemLayouts.map { (index, hoursLayout) -> | ||
| ItemData( | ||
| placeable = measure( | ||
| index, | ||
| Constraints.fixed( | ||
| width = hoursLayout.width, | ||
| height = hoursLayout.height | ||
| ) | ||
| )[0], | ||
| hoursItem = hoursLayout | ||
| ) | ||
| } | ||
| layout(constraint.maxWidth, constraint.maxHeight) { | ||
| items.forEach { (placable, hoursLayout) -> | ||
| placable.place( | ||
| hoursLayout.left, | ||
| hoursLayout.top + hoursScreen.scrollState.scrollY.toInt() | ||
| ) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| private data class HoursLayout( | ||
| val hours: List<String>, | ||
| val density: Density, | ||
| ) { | ||
| var hoursHeight = 0 | ||
| var hoursWidth = 0 | ||
| val minutePx = with(density) { (4.23).dp.roundToPx() } | ||
| val hoursLayouts = hours.mapIndexed { index, it -> | ||
| val hoursItemLayout = HoursItemLayout( | ||
| index = index, | ||
| density = density, | ||
| minutePx = minutePx | ||
| ) | ||
| hoursHeight = | ||
| maxOf(hoursHeight, hoursItemLayout.bottom) | ||
| hoursWidth = | ||
| maxOf(hoursWidth, hoursItemLayout.width) | ||
| hoursItemLayout | ||
| } | ||
|
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||
| fun visibleItemLayouts( | ||
| screenHeight: Int, | ||
| scrollY: Int | ||
| ): List<IndexedValue<HoursItemLayout>> { | ||
| return hoursLayouts.withIndex().filter { (_, layout) -> | ||
| layout.isVisible(screenHeight, scrollY) | ||
| } | ||
| } | ||
| } | ||
|
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||
| private data class HoursItemLayout( | ||
| val density: Density, | ||
| val minutePx: Int, | ||
| val index: Int | ||
| ) { | ||
| val topOffset = with(density) { horizontalLineTopOffset.roundToPx() } | ||
| val itemOffset = with(density) { hoursItemTopOffset.roundToPx() } | ||
| val height = minutePx * 60 | ||
| val width = with(density) { hoursWidth.roundToPx() } | ||
| val left = 0 | ||
| val top = index * height + topOffset - itemOffset | ||
| val right = left + width | ||
| val bottom = top + height | ||
|
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| fun isVisible( | ||
| screenHeight: Int, | ||
| scrollY: Int | ||
| ): Boolean { | ||
| val screenTop = -scrollY | ||
| val screenBottom = -scrollY + screenHeight | ||
| val yInside = | ||
| top in screenTop..screenBottom || bottom in screenTop..screenBottom | ||
| return yInside | ||
| } | ||
| } | ||
|
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| private class HoursScreen( | ||
| val hoursLayout: HoursLayout, | ||
| val scrollState: ScreenScrollState, | ||
| density: Density, | ||
| ) { | ||
| var width = 0 | ||
| private set | ||
| var height = 0 | ||
| private set | ||
|
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| val visibleItemLayouts: State<List<IndexedValue<HoursItemLayout>>> = | ||
| derivedStateOf { | ||
| hoursLayout.visibleItemLayouts( | ||
| height, | ||
| scrollState.scrollY.toInt() | ||
| ) | ||
| } | ||
|
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| val offset = with(density) { horizontalLineTopOffset.roundToPx() } | ||
| val timeHorizontalLines = derivedStateOf { | ||
| (0..10).map { | ||
| scrollState.scrollY + hoursLayout.minutePx * 60 * it + offset | ||
| } | ||
| } | ||
|
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| override fun toString(): String { | ||
| return "Screen(" + | ||
| "width=$width, " + | ||
| "height=$height, " + | ||
| "scroll=$scrollState, " + | ||
| "visibleItemLayouts=$visibleItemLayouts" + | ||
| ")" | ||
| } | ||
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| fun updateBounds(width: Int, height: Int) { | ||
| this.width = width | ||
| this.height = height | ||
| } | ||
| } | ||
|
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| @OptIn(ExperimentalFoundationApi::class) | ||
| private fun itemProvider( | ||
| itemCount: () -> Int, | ||
| itemContent: @Composable (Int) -> Unit | ||
| ): LazyLayoutItemProvider { | ||
| return object : LazyLayoutItemProvider { | ||
| @Composable | ||
| override fun Item(index: Int) { | ||
| itemContent(index) | ||
| } | ||
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| override val itemCount: Int get() = itemCount() | ||
| } | ||
| } | ||
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| private val lineStrokeSize = 1.dp | ||
| private val horizontalLineTopOffset = 16.dp | ||
| private val hoursWidth = 75.dp | ||
| private val hoursItemWidth = 43.dp | ||
| private val hoursItemHeight = 24.dp | ||
| private val hoursItemTopOffset = 11.dp | ||
| private val hoursItemEndOffset = 16.dp | ||
| private val hoursList = listOf( | ||
| "10:00", | ||
| "11:00", | ||
| "12:00", | ||
| "13:00", | ||
| "14:00", | ||
| "15:00", | ||
| "16:00", | ||
| "17:00", | ||
| "18:00", | ||
| "19:00", | ||
| ) |
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