可以增强一下吗？DataSaverMutableListState 有时候在使用的时候并不需要创建默认数据，现在不支持 #7
Comments
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您好，感谢使用，对于这种情况，如果您的 Entity 已经注册，可以手动注解类型+将默认值设置为 emptyList。代码为： var entityList: List<Entity> by rememberDataSaverListState(key = "main.entity.list", initialValue = emptyList())在 kotlin 标准库实现中， public fun <T> emptyList(): List<T> = EmptyList
internal object EmptyList : List<Nothing>, Serializable, RandomAccess {
// ...
}不过代码确实写的有问题，比如 |
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感谢及时回复，我尝试过你说的这种方式，但是如果在已经保存的有数据的情况下加载数据是报错的 |
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你是否标注了具体的泛型，比如 |
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下面是我的代码，我在尝试使用自定义类型的时候会报错（添加一点数据，然后再次启动就可以重现），基础类型String不会报错 |
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感谢反馈，我试了下确实有问题，逻辑有些错误，将会在下一版本进行改正 |
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非常感谢 ♪(･ω･)ﾉ，期待新版本 |
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连写两天，新的 var list: List<Entity> = mutableDataSaverState(key = "main.entity.list", initialValue = emptyList())同时注册 更多迁移指南和代码变更见：https://github.com/FunnySaltyFish/ComposeDataSaver/releases/tag/v1.2.1 |
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你好，我没有找到 import AppConfig.dataSaver
import androidx.compose.desktop.ui.tooling.preview.Preview
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.material3.Button
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.ui.window.Window
import androidx.compose.ui.window.application
import cn.hutool.json.JSONUtil
import com.funny.data_saver.core.DataSaverConverter
import com.funny.data_saver.core.DataSaverInterface
import com.funny.data_saver.core.DataSaverProperties
import com.funny.data_saver.core.LocalDataSaver
import com.funny.data_saver.core.mutableDataSaverStateOf
// 实体
data class Entity(var name: String = "", var remark: String = "")
// 配置
object AppConfig {
private const val FILE_NAME = "config.properties"
private val userHome = System.getProperty("user.home")
private const val PROJECT_NAME = "test-demo"
val dataSaver: DataSaverInterface = DataSaverProperties("$userHome/$PROJECT_NAME/$FILE_NAME")
}
@Composable
@Preview
fun App() {
var list: List<Entity> by mutableDataSaverStateOf<List<Entity>>(
dataSaverInterface = dataSaver,
key = "main.entity.list",
initialValue = emptyList<Entity>()
)
MaterialTheme {
Column {
Button(onClick = {
list += Entity("new entity ${list.size + 1}", "remark")
}) {
Text("add new entity")
}
LazyColumn {
items(list) {
Text(it.name)
}
}
}
}
}
fun main() = application {
// 删除第一个
DataSaverConverter.typeConverters.removeAt(0)
// 添加自定义转换
DataSaverConverter.registerTypeConverters<Entity>(
save = { bean -> JSONUtil.toJsonStr(bean) },
restore = { str ->
JSONUtil.toBean(str, Entity::class.java)
}
)
DataSaverConverter.registerTypeConverters<List<Entity>>(
save = { bean -> JSONUtil.toJsonStr(bean) },
restore = { str ->
JSONUtil.toList<Entity>(str, Entity::class.java)
}
)
Window(onCloseRequest = ::exitApplication) {
CompositionLocalProvider(LocalDataSaver provides dataSaver) {
App()
}
}
}
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抱歉让您折腾这么久，确实没有 |
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代码写的确实有问题，由于数据在读取之前不知道转换后具体是什么，这个 此外，顺带一提，由于您的 fun App() {
CompositionLocalProvider(LocalDataSaver provides AppConfig.dataSaver) {
MaterialTheme {
var list: List<Entity> by rememberDataSaverState<List<Entity>>(
key = "main.entity.list",
initialValue = emptyList()
)
Column {
Button(onClick = {
list += Entity("new entity ${list.size + 1}", "remark")
}) {
Text("add new entity")
}
LazyColumn {
items(list) {
Text(it.name)
}
}
}
}
}
} |
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😄我看到了，但是对于 inline fun <reified T> mutableDataSaverStateOf(
dataSaverInterface: DataSaverInterface,
key: String,
initialValue: T,
savePolicy: SavePolicy = SavePolicy.IMMEDIATELY,
async: Boolean = true,
coroutineScope: CoroutineScope? = null
): DataSaverMutableState<T> {
val data = try {
if (!dataSaverInterface.contains(key)) initialValue
else dataSaverInterface.readData(key, initialValue)
} catch (e: Exception) {
val restore = DataSaverConverter.findRestorer<T>(initialValue)
restore ?: throw e
runCatching {
restore(dataSaverInterface.readData(key, "")) as T
}.onFailure {
DataSaverLogger.e("error while restoring data(key=$key), set to default. StackTrace:\n${it.stackTraceToString()}")
}.getOrDefault(initialValue)
}
return DataSaverMutableState(dataSaverInterface, key, data, savePolicy, async, coroutineScope)
} |
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嗯嗯，这个方法是必传的，因为没有 @composable 修饰（可以用在 ViewModel 之中或其他全局单例），没法从 CompositionLocal 中获取到当前 DataSaverInterface 实例。我刚刚的回复是在 Composable 中，可以用 |
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懂你的意思，非常感谢。(^▽^) |
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哈喽，我又来了 var list: MutableList<Entity> by rememberDataSaverState<MutableList<Entity>>(
key = "main.entity.list",
initialValue = mutableListOf<Entity>(),
senseExternalDataChange = true
) |
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Sorry这两天有点别的事，回的晚了些。 |
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好的，有没有考虑过对mutableListOf进行支持。目前看添加后页面没有刷新（迷），数据没有保存 var list: MutableList<Entity> by rememberDataSaverState<MutableList<Entity>>(
key = "main.entity.list",
initialValue = mutableListOf<Entity>()
)
list.add(Entity("new entity ${list.size + 1}", "remark")) |
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很难支持，因为我没有办法监听到 var list: MutableList<Entity> by rememberDataSaverState<MutableList<Entity>>(
key = "main.entity.list",
initialValue = mutableListOf<Entity>()
)
list = mutableListOf<Entity>().apply {
addAll(list)
add(Entity("new entity ${list.size + 1}", "remark"))
}或者直接用 public operator fun <T> Collection<T>.plus(element: T): List<T> {
val result = ArrayList<T>(size + 1)
result.addAll(this)
result.add(element)
return result
}
var list: List<Entity> by rememberDataSaverState(
key = "main.entity.list",
initialValue = emptyList<Entity>()
)
list += Entity("new entity ${list.size + 1}", "remark") |
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好的，大概什么时候发布新版本呐？ |
抱歉才回复，这两天事情有点多。二是我发现了个小问题，如果注册了多个 我会尽量找时间维护的 |
希望可以使用类创建
比如
var entityList: List by rememberDataSaverListState(key = "main.entity.list", clazz = Entity::class.java)
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