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rework Scaffold to use subcompose & content-padding only for action
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@hrach
hrach committed Feb 14, 2023
1 parent e50760e commit a9d5017
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Showing 3 changed files with 143 additions and 125 deletions.
116 changes: 60 additions & 56 deletions ui/src/main/java/kiwi/orbit/compose/ui/controls/Scaffold.kt
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Original file line number Diff line number Diff line change
@@ -1,38 +1,34 @@
package kiwi.orbit.compose.ui.controls

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.asPaddingValues
import androidx.compose.foundation.layout.calculateEndPadding
import androidx.compose.foundation.layout.calculateStartPadding
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.ime
import androidx.compose.foundation.layout.navigationBars
import androidx.compose.foundation.layout.systemBars
import androidx.compose.foundation.layout.union
import androidx.compose.foundation.layout.windowInsetsPadding
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.ProvidableCompositionLocal
import androidx.compose.runtime.remember
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Brush
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.layout.SubcomposeLayout
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.offset
import kiwi.orbit.compose.ui.OrbitTheme
import kiwi.orbit.compose.ui.controls.internal.CustomPlaceholder
import kiwi.orbit.compose.ui.controls.internal.MutablePaddingValues
import kiwi.orbit.compose.ui.controls.internal.OrbitPreviews
import kiwi.orbit.compose.ui.controls.internal.Preview
import kiwi.orbit.compose.ui.foundation.contentColorFor

public val LocalScaffoldPadding: ProvidableCompositionLocal<PaddingValues> =
staticCompositionLocalOf { PaddingValues(0.dp) }

@Composable
public fun Scaffold(
modifier: Modifier = Modifier,
Expand All @@ -43,6 +39,7 @@ public fun Scaffold(
actionLayout: @Composable () -> Unit = { ScaffoldAction(backgroundColor, action) },
toastHostState: ToastHostState = remember { ToastHostState() },
toastHost: @Composable (ToastHostState) -> Unit = { ToastHost(it) },
contentWindowInsets: WindowInsets = WindowInsets.systemBars,
content: @Composable (contentPadding: PaddingValues) -> Unit,
) {
Surface(
Expand All @@ -55,6 +52,7 @@ public fun Scaffold(
toast = { toastHost(toastHostState) },
action = actionLayout,
content = content,
contentWindowInsets = contentWindowInsets,
)
}
}
Expand All @@ -65,57 +63,48 @@ private fun ScaffoldLayout(
toast: @Composable () -> Unit,
action: @Composable () -> Unit,
content: @Composable (contentPadding: PaddingValues) -> Unit,
contentWindowInsets: WindowInsets,
) {
val density = LocalDensity.current
val contentPadding = remember { MutablePaddingValues() }
val insets = WindowInsets.ime.union(WindowInsets.navigationBars)

Layout(
content = {
Box { topBar() }
Box { toast() }
Box { action() }
Box {
CompositionLocalProvider(
LocalScaffoldPadding provides contentPadding,
) {
content(contentPadding)
}
}
},
) { measurables, constraints ->
SubcomposeLayout { constraints ->
val layoutWidth = constraints.maxWidth
val layoutHeight = constraints.maxHeight
val looseConstraints = constraints.copy(minWidth = 0, minHeight = 0)

val topBarPlaceable = measurables[0].measure(looseConstraints)

val topBarHeight = topBarPlaceable.height
val mainConstraints = looseConstraints.copy(maxHeight = layoutHeight - topBarHeight)
val toastPlaceables = measurables[1].measure(mainConstraints)

val actionPlaceable = measurables[2].measure(mainConstraints)
val actionHeight = actionPlaceable.height

val contentPlaceable = measurables[3].measure(looseConstraints)
val topBarPlaceables = subcompose(SlotTopAppBar, topBar).map { it.measure(looseConstraints) }
val actionPlaceables = subcompose(SlotAction, action).map { it.measure(looseConstraints) }
val toastPlaceables = subcompose(SlotToast, toast).map { it.measure(looseConstraints) }

val topInset = topBarHeight.takeUnless { it == 0 } ?: insets.getTop(density)
val startInset = insets.getLeft(density, LayoutDirection.Ltr)
val endInset = insets.getRight(density, LayoutDirection.Ltr)
val bottomInset = actionHeight.takeUnless { it == 0 } ?: insets.getBottom(density)
val actionHeight = actionPlaceables.maxOfOrNull { it.height } ?: 0
val contentTop = topBarPlaceables.maxOfOrNull { it.height } ?: 0
val contentBottom = (actionHeight - ActionGradientHeight.roundToPx()).coerceAtLeast(0)
val contentConstraints = looseConstraints.copy(
maxHeight = layoutHeight - contentTop - contentBottom,
)

contentPadding.updateFrom(
top = topInset.toDp(),
start = startInset.toDp(),
end = endInset.toDp(),
bottom = bottomInset.toDp(),
val insets = contentWindowInsets.asPaddingValues(this)
val innerPadding = PaddingValues(
top = if (topBarPlaceables.isEmpty()) {
insets.calculateTopPadding()
} else {
0.dp
},
bottom = if (actionPlaceables.isEmpty()) {
insets.calculateBottomPadding()
} else {
ActionGradientHeight
},
start = insets.calculateStartPadding(layoutDirection),
end = insets.calculateEndPadding(layoutDirection),
)
val contentPlaceables = subcompose(SlotContent) {
content(innerPadding)
}.map { it.measure(contentConstraints) }

layout(layoutWidth, layoutHeight) {
contentPlaceable.place(0, 0)
topBarPlaceable.place(0, 0)
actionPlaceable.place(0, layoutHeight - bottomInset)
toastPlaceables.place((layoutWidth - toastPlaceables.measuredWidth) / 2, topBarHeight)
contentPlaceables.forEach { it.placeRelative(0, contentTop) }
topBarPlaceables.forEach { it.placeRelative(0, 0) }
actionPlaceables.forEach { it.placeRelative(0, layoutHeight - actionHeight) }
toastPlaceables.forEach { it.placeRelative(0, contentTop) }
}
}
}
Expand All @@ -133,7 +122,7 @@ private fun ScaffoldAction(
val brush = remember(density, backgroundColor) {
Brush.verticalGradient(
colors = listOf(Color.Transparent, backgroundColor),
endY = with(density) { 16.dp.toPx() },
endY = with(density) { ActionGradientHeight.toPx() },
)
}
Layout(
Expand All @@ -142,20 +131,35 @@ private fun ScaffoldAction(
.background(brush)
.windowInsetsPadding(WindowInsets.ime.union(WindowInsets.navigationBars)),
) { measurables, constraints ->
val action = measurables.firstOrNull() ?: return@Layout layout(0, 0) {}
val action = measurables.firstOrNull()
?: return@Layout layout(0, 0) {}

val top = ActionGradientHeight.roundToPx()
val padding = 16.dp.roundToPx()
val placeable = action.measure(constraints.offset(horizontal = -2 * padding))
val width = constraints.maxWidth
val height = placeable.height + 2 * padding
val height = top + placeable.height + padding

layout(width, height) {
placeable.place(x = (width - placeable.width) / 2, y = padding)
placeable.place(x = (width - placeable.width) / 2, y = top)
}
}
}

@Preview
private val SlotTopAppBar = 0
private val SlotAction = 1
private val SlotToast = 2
private val SlotContent = 3

/**
* Action's top gradient currently decreased from 16.dp to minimize contentPadding
* (auto)scrolling issues. We need a new api for scroll to be able to account for
* this semi-transparent area.
* https://issuetracker.google.com/issues/221252680
*/
private val ActionGradientHeight = 8.dp

@OrbitPreviews
@Composable
internal fun ScaffoldPreview() {
Preview {
Expand Down
70 changes: 1 addition & 69 deletions ui/src/main/java/kiwi/orbit/compose/ui/controls/TextField.kt
View file
Original file line number Diff line number Diff line change
Expand Up @@ -3,39 +3,28 @@ package kiwi.orbit.compose.ui.controls
import androidx.compose.animation.animateColor
import androidx.compose.animation.core.tween
import androidx.compose.animation.core.updateTransition
import androidx.compose.foundation.ExperimentalFoundationApi
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsFocusedAsState
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.relocation.BringIntoViewRequester
import androidx.compose.foundation.relocation.bringIntoViewRequester
import androidx.compose.foundation.text.BasicTextField
import androidx.compose.foundation.text.KeyboardActions
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.State
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.focus.onFocusEvent
import androidx.compose.ui.geometry.toRect
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.SolidColor
import androidx.compose.ui.layout.LayoutCoordinates
import androidx.compose.ui.layout.onGloballyPositioned
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.semantics.error
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.input.TextFieldValue
import androidx.compose.ui.text.input.VisualTransformation
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.toSize
import kiwi.orbit.compose.icons.Icons
import kiwi.orbit.compose.ui.OrbitTheme
import kiwi.orbit.compose.ui.R
Expand All @@ -47,10 +36,6 @@ import kiwi.orbit.compose.ui.controls.internal.OrbitPreviews
import kiwi.orbit.compose.ui.controls.internal.Preview
import kiwi.orbit.compose.ui.foundation.LocalTextStyle
import kiwi.orbit.compose.ui.foundation.ProvideMergedTextStyle
import kotlinx.coroutines.FlowPreview
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.collectLatest
import kotlinx.coroutines.flow.debounce

@Composable
public fun TextField(
Expand All @@ -71,7 +56,6 @@ public fun TextField(
keyboardActions: KeyboardActions = KeyboardActions.Default,
singleLine: Boolean = true,
maxLines: Int = Int.MAX_VALUE,
bringIntoView: Boolean = true,
visualTransformation: VisualTransformation = VisualTransformation.None,
interactionSource: MutableInteractionSource = remember { MutableInteractionSource() },
) {
Expand All @@ -94,13 +78,11 @@ public fun TextField(
keyboardActions = keyboardActions,
singleLine = singleLine,
maxLines = maxLines,
bringIntoView = bringIntoView,
visualTransformation = visualTransformation,
interactionSource = interactionSource,
)
}

@OptIn(ExperimentalFoundationApi::class)
@Composable
internal fun TextField(
value: String,
Expand All @@ -121,38 +103,17 @@ internal fun TextField(
keyboardActions: KeyboardActions = KeyboardActions.Default,
singleLine: Boolean = true,
maxLines: Int = Int.MAX_VALUE,
bringIntoView: Boolean = true,
visualTransformation: VisualTransformation = VisualTransformation.None,
interactionSource: MutableInteractionSource = remember { MutableInteractionSource() },
) {
val autoBringIntoViewSetupModifier: Modifier
val autoBringIntoViewFocusModifier: Modifier

if (bringIntoView) {
val bringIntoViewRequester = remember { BringIntoViewRequester() }
val layoutCoordinates = remember { mutableStateOf<LayoutCoordinates?>(null) }
val focused = remember { mutableStateOf(false) }

autoBringIntoViewSetupModifier = Modifier
.bringIntoViewRequester(bringIntoViewRequester)
.onGloballyPositioned { layoutCoordinates.value = it }
autoBringIntoViewFocusModifier = Modifier.onFocusEvent { focused.value = it.isFocused }

BringIntoViewWhenFocused(focused, layoutCoordinates, bringIntoViewRequester)
} else {
autoBringIntoViewSetupModifier = Modifier
autoBringIntoViewFocusModifier = Modifier
}

val errorMessage = stringResource(R.string.orbit_field_default_error)
ColumnWithMinConstraints(
modifier
.semantics {
if (error != null) {
this.error(errorMessage)
}
}
.then(autoBringIntoViewSetupModifier),
},
) {
ProvideMergedTextStyle(OrbitTheme.typography.bodyNormal) {
var textFieldValueState by remember { mutableStateOf(TextFieldValue(text = value)) }
Expand Down Expand Up @@ -199,7 +160,6 @@ internal fun TextField(
}
},
modifier = Modifier
.then(autoBringIntoViewFocusModifier)
.border(1.dp, borderColor.value, OrbitTheme.shapes.normal)
.background(OrbitTheme.colors.surface.normal, OrbitTheme.shapes.normal),
enabled = enabled,
Expand Down Expand Up @@ -238,34 +198,6 @@ internal fun TextField(
}
}

@OptIn(FlowPreview::class, ExperimentalFoundationApi::class)
@Composable
private fun BringIntoViewWhenFocused(
focused: State<Boolean>,
layoutCoordinates: State<LayoutCoordinates?>,
bringIntoViewRequester: BringIntoViewRequester,
) {
val density = LocalDensity.current
val scaffoldBottomPadding = remember {
MutableStateFlow(0f)
}
val height = with(density) {
LocalScaffoldPadding.current.calculateBottomPadding().toPx()
}
LaunchedEffect(height) {
scaffoldBottomPadding.emit(height)
}
LaunchedEffect(focused.value) {
if (focused.value) {
scaffoldBottomPadding.debounce(100).collectLatest { scaffoldBottomPadding ->
val size = layoutCoordinates.value?.size?.toSize() ?: return@collectLatest
val paddedSize = size.copy(height = size.height + scaffoldBottomPadding)
bringIntoViewRequester.bringIntoView(paddedSize.toRect())
}
}
}
}

private enum class InputState {
Normal,
NormalError,
Expand Down
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