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Code Issues Packages Projects Releases Wiki Activity

New Pager implementation (#8323)

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Minimal implementation using new Compose SnapFlingBehavior
This commit is contained in:
Ivan Iskandar 2022-10-29 23:32:55 +07:00 committed by GitHub
parent 5b12c144da
commit f9c25b350e
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7 changed files with 186 additions and 10 deletions
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2
app/build.gradle.kts
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@ -176,8 +176,6 @@ dependencies {
implementation(compose.accompanist.webview)
implementation(compose.accompanist.swiperefresh)
implementation(compose.accompanist.flowlayout)
implementation(compose.accompanist.pager.core)
implementation(compose.accompanist.pager.indicators)
implementation(compose.accompanist.permissions)
implementation(androidx.paging.runtime)

182
app/src/main/java/eu/kanade/presentation/components/Pager.kt Normal file
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@ -0,0 +1,182 @@
package eu.kanade.presentation.components
import androidx.compose.foundation.gestures.snapping.rememberSnapFlingBehavior
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxScope
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyListItemInfo
import androidx.compose.foundation.lazy.LazyListState
import androidx.compose.foundation.lazy.LazyRow
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.Saver
import androidx.compose.runtime.saveable.listSaver
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.runtime.snapshotFlow
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.util.fastMaxBy
import kotlinx.coroutines.flow.distinctUntilChanged
@Composable
fun HorizontalPager(
count: Int,
modifier: Modifier = Modifier,
state: PagerState = rememberPagerState(),
key: ((page: Int) -> Any)? = null,
contentPadding: PaddingValues = PaddingValues(),
verticalAlignment: Alignment.Vertical = Alignment.CenterVertically,
userScrollEnabled: Boolean = true,
content: @Composable BoxScope.(page: Int) -> Unit,
) {
Pager(
count = count,
modifier = modifier,
state = state,
isVertical = false,
key = key,
contentPadding = contentPadding,
verticalAlignment = verticalAlignment,
userScrollEnabled = userScrollEnabled,
content = content,
)
}
@Composable
private fun Pager(
count: Int,
modifier: Modifier,
state: PagerState,
isVertical: Boolean,
key: ((page: Int) -> Any)?,
contentPadding: PaddingValues,
userScrollEnabled: Boolean,
verticalAlignment: Alignment.Vertical = Alignment.CenterVertically,
horizontalAlignment: Alignment.Horizontal = Alignment.CenterHorizontally,
content: @Composable BoxScope.(page: Int) -> Unit,
) {
LaunchedEffect(count) {
state.currentPage = minOf(count - 1, state.currentPage).coerceAtLeast(0)
}
LaunchedEffect(state) {
snapshotFlow { state.mostVisiblePageLayoutInfo?.index }
.distinctUntilChanged()
.collect { state.updateCurrentPageBasedOnLazyListState() }
}
if (isVertical) {
LazyColumn(
modifier = modifier,
state = state.lazyListState,
contentPadding = contentPadding,
horizontalAlignment = horizontalAlignment,
verticalArrangement = Arrangement.aligned(verticalAlignment),
userScrollEnabled = userScrollEnabled,
flingBehavior = rememberSnapFlingBehavior(lazyListState = state.lazyListState),
) {
items(
count = count,
key = key,
) { page ->
Box(
modifier = Modifier
.fillParentMaxHeight()
.wrapContentSize(),
) {
content(this, page)
}
}
}
} else {
LazyRow(
modifier = modifier,
state = state.lazyListState,
contentPadding = contentPadding,
verticalAlignment = verticalAlignment,
horizontalArrangement = Arrangement.aligned(horizontalAlignment),
userScrollEnabled = userScrollEnabled,
flingBehavior = rememberSnapFlingBehavior(lazyListState = state.lazyListState),
) {
items(
count = count,
key = key,
) { page ->
Box(
modifier = Modifier
.fillParentMaxWidth()
.wrapContentSize(),
) {
content(this, page)
}
}
}
}
}
@Composable
fun rememberPagerState(
initialPage: Int = 0,
) = rememberSaveable(saver = PagerState.Saver) {
PagerState(currentPage = initialPage)
}
@Stable
class PagerState(
currentPage: Int = 0,
) {
init { check(currentPage >= 0) { "currentPage cannot be less than zero" } }
val lazyListState = LazyListState(firstVisibleItemIndex = currentPage)
private var _currentPage by mutableStateOf(currentPage)
var currentPage: Int
get() = _currentPage
set(value) {
if (value != _currentPage) {
_currentPage = value
}
}
val mostVisiblePageLayoutInfo: LazyListItemInfo?
get() {
val layoutInfo = lazyListState.layoutInfo
return layoutInfo.visibleItemsInfo.fastMaxBy {
val start = maxOf(it.offset, 0)
val end = minOf(
it.offset + it.size,
layoutInfo.viewportEndOffset - layoutInfo.afterContentPadding,
)
end - start
}
}
fun updateCurrentPageBasedOnLazyListState() {
mostVisiblePageLayoutInfo?.let {
currentPage = it.index
}
}
suspend fun animateScrollToPage(page: Int) {
lazyListState.animateScrollToItem(index = page)
}
suspend fun scrollToPage(page: Int) {
lazyListState.scrollToItem(index = page)
updateCurrentPageBasedOnLazyListState()
}
companion object {
val Saver: Saver<PagerState, *> = listSaver(
save = { listOf(it.currentPage) },
restore = { PagerState(it[0]) },
)
}
}

2
app/src/main/java/eu/kanade/presentation/components/TabbedScreen.kt
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@ -16,8 +16,6 @@ import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalLayoutDirection
import androidx.compose.ui.res.stringResource
import com.google.accompanist.pager.HorizontalPager
import com.google.accompanist.pager.rememberPagerState
import eu.kanade.tachiyomi.widget.TachiyomiBottomNavigationView
import kotlinx.coroutines.launch

2
app/src/main/java/eu/kanade/presentation/library/components/LibraryContent.kt
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@ -15,12 +15,12 @@ import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalLayoutDirection
import com.google.accompanist.pager.rememberPagerState
import eu.kanade.core.prefs.PreferenceMutableState
import eu.kanade.domain.category.model.Category
import eu.kanade.domain.library.model.LibraryDisplayMode
import eu.kanade.domain.library.model.LibraryManga
import eu.kanade.presentation.components.SwipeRefresh
import eu.kanade.presentation.components.rememberPagerState
import eu.kanade.presentation.library.LibraryState
import eu.kanade.tachiyomi.ui.library.LibraryItem
import kotlinx.coroutines.delay

4
app/src/main/java/eu/kanade/presentation/library/components/LibraryPager.kt
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@ -10,11 +10,11 @@ import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalConfiguration
import com.google.accompanist.pager.HorizontalPager
import com.google.accompanist.pager.PagerState
import eu.kanade.core.prefs.PreferenceMutableState
import eu.kanade.domain.library.model.LibraryDisplayMode
import eu.kanade.domain.library.model.LibraryManga
import eu.kanade.presentation.components.HorizontalPager
import eu.kanade.presentation.components.PagerState
import eu.kanade.tachiyomi.ui.library.LibraryItem
@Composable

2
app/src/main/java/eu/kanade/presentation/library/components/LibraryTabs.kt
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@ -10,11 +10,11 @@ import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.ui.unit.dp
import com.google.accompanist.pager.PagerState
import eu.kanade.domain.category.model.Category
import eu.kanade.presentation.category.visualName
import eu.kanade.presentation.components.AppStateBanners
import eu.kanade.presentation.components.Divider
import eu.kanade.presentation.components.PagerState
import eu.kanade.presentation.components.TabIndicator
import eu.kanade.presentation.components.TabText
import kotlinx.coroutines.launch

2
gradle/compose.versions.toml
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@ -19,6 +19,4 @@ material-icons = { module = "androidx.compose.material:material-icons-extended"
accompanist-webview = { module = "com.google.accompanist:accompanist-webview", version.ref = "accompanist" }
accompanist-swiperefresh = { module = "com.google.accompanist:accompanist-swiperefresh", version.ref = "accompanist" }
accompanist-flowlayout = { module = "com.google.accompanist:accompanist-flowlayout", version.ref = "accompanist" }
accompanist-pager-core = { module = "com.google.accompanist:accompanist-pager", version.ref = "accompanist" }
accompanist-pager-indicators = { module = "com.google.accompanist:accompanist-pager-indicators", version.ref = "accompanist" }
accompanist-permissions = { module = "com.google.accompanist:accompanist-permissions", version.ref = "accompanist" }