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Convert cover dialog view to compose (#7346)
This commit is contained in:
Ivan Iskandar
GitHub
296
app/src/main/java/eu/kanade/presentation/components/Scaffold.kt
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296
app/src/main/java/eu/kanade/presentation/components/Scaffold.kt
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/*
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* Copyright 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package eu.kanade.presentation.components
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import androidx.compose.foundation.layout.PaddingValues
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import androidx.compose.material3.ExperimentalMaterial3Api
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import androidx.compose.material3.FloatingActionButton
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import androidx.compose.material3.LocalContentColor
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import androidx.compose.material3.MaterialTheme
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import androidx.compose.material3.NavigationBar
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import androidx.compose.material3.SmallTopAppBar
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import androidx.compose.material3.Snackbar
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import androidx.compose.material3.SnackbarHost
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import androidx.compose.material3.SnackbarHostState
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import androidx.compose.material3.Surface
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import androidx.compose.material3.contentColorFor
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import androidx.compose.runtime.Composable
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import androidx.compose.runtime.CompositionLocalProvider
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import androidx.compose.runtime.Immutable
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import androidx.compose.runtime.staticCompositionLocalOf
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.graphics.Color
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import androidx.compose.ui.layout.SubcomposeLayout
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import androidx.compose.ui.unit.Constraints
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import androidx.compose.ui.unit.LayoutDirection
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import androidx.compose.ui.unit.dp
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/**
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* <a href="https://material.io/design/layout/understanding-layout.html" class="external" target="_blank">Material Design layout</a>.
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*
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* Scaffold implements the basic material design visual layout structure.
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*
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* This component provides API to put together several material components to construct your
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* screen, by ensuring proper layout strategy for them and collecting necessary data so these
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* components will work together correctly.
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*
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* Simple example of a Scaffold with [SmallTopAppBar], [FloatingActionButton]:
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*
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* @sample androidx.compose.material3.samples.SimpleScaffoldWithTopBar
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*
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* To show a [Snackbar], use [SnackbarHostState.showSnackbar].
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*
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* @sample androidx.compose.material3.samples.ScaffoldWithSimpleSnackbar
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*
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* Tachiyomi changes:
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* * Remove height constraint for expanded app bar
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* * Also take account of fab height when providing inner padding
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*
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* @param modifier the [Modifier] to be applied to this scaffold
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* @param topBar top app bar of the screen, typically a [SmallTopAppBar]
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* @param bottomBar bottom bar of the screen, typically a [NavigationBar]
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* @param snackbarHost component to host [Snackbar]s that are pushed to be shown via
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* [SnackbarHostState.showSnackbar], typically a [SnackbarHost]
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* @param floatingActionButton Main action button of the screen, typically a [FloatingActionButton]
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* @param floatingActionButtonPosition position of the FAB on the screen. See [FabPosition].
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* @param containerColor the color used for the background of this scaffold. Use [Color.Transparent]
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* to have no color.
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* @param contentColor the preferred color for content inside this scaffold. Defaults to either the
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* matching content color for [containerColor], or to the current [LocalContentColor] if
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* [containerColor] is not a color from the theme.
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* @param content content of the screen. The lambda receives a [PaddingValues] that should be
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* applied to the content root via [Modifier.padding] to properly offset top and bottom bars. If
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* using [Modifier.verticalScroll], apply this modifier to the child of the scroll, and not on
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* the scroll itself.
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*/
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@ExperimentalMaterial3Api
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@Composable
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fun Scaffold(
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modifier: Modifier = Modifier,
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topBar: @Composable () -> Unit = {},
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bottomBar: @Composable () -> Unit = {},
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snackbarHost: @Composable () -> Unit = {},
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floatingActionButton: @Composable () -> Unit = {},
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floatingActionButtonPosition: FabPosition = FabPosition.End,
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containerColor: Color = MaterialTheme.colorScheme.background,
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contentColor: Color = contentColorFor(containerColor),
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content: @Composable (PaddingValues) -> Unit,
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) {
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Surface(modifier = modifier, color = containerColor, contentColor = contentColor) {
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ScaffoldLayout(
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fabPosition = floatingActionButtonPosition,
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topBar = topBar,
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bottomBar = bottomBar,
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content = content,
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snackbar = snackbarHost,
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fab = floatingActionButton,
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)
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}
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}
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/**
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* Layout for a [Scaffold]'s content.
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*
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* @param fabPosition [FabPosition] for the FAB (if present)
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* @param topBar the content to place at the top of the [Scaffold], typically a [SmallTopAppBar]
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* @param content the main 'body' of the [Scaffold]
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* @param snackbar the [Snackbar] displayed on top of the [content]
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* @param fab the [FloatingActionButton] displayed on top of the [content], below the [snackbar]
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* and above the [bottomBar]
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* @param bottomBar the content to place at the bottom of the [Scaffold], on top of the
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* [content], typically a [NavigationBar].
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*/
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@OptIn(ExperimentalMaterial3Api::class)
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@Composable
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private fun ScaffoldLayout(
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fabPosition: FabPosition,
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topBar: @Composable () -> Unit,
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content: @Composable (PaddingValues) -> Unit,
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snackbar: @Composable () -> Unit,
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fab: @Composable () -> Unit,
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bottomBar: @Composable () -> Unit,
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) {
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SubcomposeLayout { constraints ->
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val layoutWidth = constraints.maxWidth
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val layoutHeight = constraints.maxHeight
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val looseConstraints = constraints.copy(minWidth = 0, minHeight = 0)
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/**
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* Tachiyomi: Remove height constraint for expanded app bar
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*/
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val topBarConstraints = looseConstraints.copy(maxHeight = Constraints.Infinity)
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layout(layoutWidth, layoutHeight) {
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val topBarPlaceables = subcompose(ScaffoldLayoutContent.TopBar, topBar).map {
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it.measure(topBarConstraints)
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}
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val topBarHeight = topBarPlaceables.maxByOrNull { it.height }?.height ?: 0
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val snackbarPlaceables = subcompose(ScaffoldLayoutContent.Snackbar, snackbar).map {
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it.measure(looseConstraints)
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}
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val snackbarHeight = snackbarPlaceables.maxByOrNull { it.height }?.height ?: 0
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val snackbarWidth = snackbarPlaceables.maxByOrNull { it.width }?.width ?: 0
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val fabPlaceables =
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subcompose(ScaffoldLayoutContent.Fab, fab).mapNotNull { measurable ->
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measurable.measure(looseConstraints).takeIf { it.height != 0 && it.width != 0 }
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}
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val fabHeight = fabPlaceables.maxByOrNull { it.height }?.height ?: 0
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val fabPlacement = if (fabPlaceables.isNotEmpty()) {
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val fabWidth = fabPlaceables.maxByOrNull { it.width }!!.width
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// FAB distance from the left of the layout, taking into account LTR / RTL
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val fabLeftOffset = if (fabPosition == FabPosition.End) {
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if (layoutDirection == LayoutDirection.Ltr) {
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layoutWidth - FabSpacing.roundToPx() - fabWidth
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} else {
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FabSpacing.roundToPx()
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}
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} else {
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(layoutWidth - fabWidth) / 2
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}
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FabPlacement(
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left = fabLeftOffset,
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width = fabWidth,
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height = fabHeight,
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)
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} else {
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null
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}
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val bottomBarPlaceables = subcompose(ScaffoldLayoutContent.BottomBar) {
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CompositionLocalProvider(
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LocalFabPlacement provides fabPlacement,
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content = bottomBar,
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)
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}.map { it.measure(looseConstraints) }
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val bottomBarHeight = bottomBarPlaceables.maxByOrNull { it.height }?.height ?: 0
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val fabOffsetFromBottom = fabPlacement?.let {
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if (bottomBarHeight == 0) {
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it.height + FabSpacing.roundToPx()
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} else {
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// Total height is the bottom bar height + the FAB height + the padding
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// between the FAB and bottom bar
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bottomBarHeight + it.height + FabSpacing.roundToPx()
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}
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}
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val snackbarOffsetFromBottom = if (snackbarHeight != 0) {
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snackbarHeight + (fabOffsetFromBottom ?: bottomBarHeight)
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} else {
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0
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}
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/**
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* Tachiyomi: Also take account of fab height when providing inner padding
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*/
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val bodyContentPlaceables = subcompose(ScaffoldLayoutContent.MainContent) {
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val innerPadding = PaddingValues(
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top = topBarHeight.toDp(),
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bottom = bottomBarHeight.toDp() + fabHeight.toDp(),
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)
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content(innerPadding)
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}.map { it.measure(looseConstraints) }
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// Placing to control drawing order to match default elevation of each placeable
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bodyContentPlaceables.forEach {
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it.place(0, 0)
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}
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topBarPlaceables.forEach {
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it.place(0, 0)
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}
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snackbarPlaceables.forEach {
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it.place(
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(layoutWidth - snackbarWidth) / 2,
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layoutHeight - snackbarOffsetFromBottom,
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)
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}
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// The bottom bar is always at the bottom of the layout
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bottomBarPlaceables.forEach {
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it.place(0, layoutHeight - bottomBarHeight)
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}
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// Explicitly not using placeRelative here as `leftOffset` already accounts for RTL
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fabPlacement?.let { placement ->
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fabPlaceables.forEach {
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it.place(placement.left, layoutHeight - fabOffsetFromBottom!!)
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}
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}
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}
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}
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}
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/**
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* The possible positions for a [FloatingActionButton] attached to a [Scaffold].
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*/
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@ExperimentalMaterial3Api
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@JvmInline
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value class FabPosition internal constructor(@Suppress("unused") private val value: Int) {
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companion object {
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/**
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* Position FAB at the bottom of the screen in the center, above the [NavigationBar] (if it
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* exists)
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*/
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val Center = FabPosition(0)
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/**
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* Position FAB at the bottom of the screen at the end, above the [NavigationBar] (if it
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* exists)
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*/
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val End = FabPosition(1)
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}
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override fun toString(): String {
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return when (this) {
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Center -> "FabPosition.Center"
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else -> "FabPosition.End"
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}
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}
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}
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/**
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* Placement information for a [FloatingActionButton] inside a [Scaffold].
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*
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* @property left the FAB's offset from the left edge of the bottom bar, already adjusted for RTL
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* support
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* @property width the width of the FAB
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* @property height the height of the FAB
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*/
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@Immutable
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internal class FabPlacement(
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val left: Int,
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val width: Int,
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val height: Int,
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)
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/**
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* CompositionLocal containing a [FabPlacement] that is used to calculate the FAB bottom offset.
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*/
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internal val LocalFabPlacement = staticCompositionLocalOf<FabPlacement?> { null }
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// FAB spacing above the bottom bar / bottom of the Scaffold
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private val FabSpacing = 16.dp
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private enum class ScaffoldLayoutContent { TopBar, MainContent, Snackbar, Fab, BottomBar }
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