71 lines
2.5 KiB
Kotlin
71 lines
2.5 KiB
Kotlin
/*
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* Copyright 2019 Hippo Seven
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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 com.hippo.ehviewer.util
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import androidx.compose.runtime.Composable
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import androidx.compose.runtime.DisallowComposableCalls
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import androidx.compose.runtime.Stable
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import androidx.compose.runtime.collectAsState
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import androidx.compose.runtime.getValue
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import androidx.compose.runtime.remember
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import androidx.paging.compose.LazyPagingItems
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import com.ehviewer.core.model.GalleryInfo
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import com.ehviewer.core.ui.util.launchInVM
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import com.ehviewer.core.ui.util.rememberUpdatedStateInVM
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import com.hippo.ehviewer.EhDB
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.flow.FlowCollector
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import kotlinx.coroutines.flow.MutableSharedFlow
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import kotlinx.coroutines.flow.transform
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import kotlinx.coroutines.launch
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object FavouriteStatusRouter {
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fun notify(galleryInfo: GalleryInfo) {
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globalFlow.tryEmit(galleryInfo)
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}
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private val listenerScope = CoroutineScope(Dispatchers.IO)
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val globalFlow = MutableSharedFlow<GalleryInfo>(extraBufferCapacity = 1).apply {
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listenerScope.launch {
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collect { info ->
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EhDB.updateFavoriteSlot(info.gid, info.favoriteSlot)
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}
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}
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}
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suspend fun collect(collector: FlowCollector<GalleryInfo>): Nothing = globalFlow.collect(collector)
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@Stable
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@Composable
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inline fun <R> collectAsState(initial: GalleryInfo, crossinline transform: @DisallowComposableCalls (Int) -> R) = remember {
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globalFlow.transform { info -> if (initial.gid == info.gid) emit(transform(info.favoriteSlot)) }
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}.collectAsState(transform(initial.favoriteSlot))
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@Composable
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fun Observe(list: LazyPagingItems<out GalleryInfo>) {
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val realList by rememberUpdatedStateInVM(newValue = list.itemSnapshotList.items)
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launchInVM {
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collect { info ->
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realList.forEach { item ->
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if (item.gid == info.gid) item.favoriteSlot = info.favoriteSlot
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}
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}
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}
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}
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}
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