forked from MarcoBuster/Magisk
106 lines
3.1 KiB
Kotlin
106 lines
3.1 KiB
Kotlin
package com.topjohnwu.magisk.arch
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import android.Manifest
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import androidx.annotation.CallSuper
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import androidx.databinding.Bindable
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import androidx.databinding.Observable
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import androidx.databinding.PropertyChangeRegistry
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import androidx.lifecycle.LiveData
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import androidx.lifecycle.MutableLiveData
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import androidx.lifecycle.ViewModel
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import androidx.lifecycle.viewModelScope
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import androidx.navigation.NavDirections
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import com.topjohnwu.magisk.BR
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import com.topjohnwu.magisk.R
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import com.topjohnwu.magisk.core.Info
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import com.topjohnwu.magisk.events.BackPressEvent
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import com.topjohnwu.magisk.events.NavigationEvent
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import com.topjohnwu.magisk.events.PermissionEvent
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import com.topjohnwu.magisk.events.SnackbarEvent
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import com.topjohnwu.magisk.utils.ObservableHost
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import com.topjohnwu.magisk.utils.set
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import kotlinx.coroutines.Job
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abstract class BaseViewModel(
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initialState: State = State.LOADING
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) : ViewModel(), ObservableHost {
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override var callbacks: PropertyChangeRegistry? = null
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enum class State {
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LOADED, LOADING, LOADING_FAILED
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}
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@get:Bindable
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val loading get() = state == State.LOADING
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@get:Bindable
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val loaded get() = state == State.LOADED
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@get:Bindable
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val loadFailed get() = state == State.LOADING_FAILED
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val isConnected get() = Info.isConnected
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val viewEvents: LiveData<ViewEvent> get() = _viewEvents
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var state= initialState
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set(value) = set(value, field, { field = it }, BR.loading, BR.loaded, BR.loadFailed)
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private val _viewEvents = MutableLiveData<ViewEvent>()
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private var runningJob: Job? = null
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private val refreshCallback = object : Observable.OnPropertyChangedCallback() {
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override fun onPropertyChanged(sender: Observable?, propertyId: Int) {
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requestRefresh()
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}
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}
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init {
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isConnected.addOnPropertyChangedCallback(refreshCallback)
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}
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/** This should probably never be called manually, it's called manually via delegate. */
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@Synchronized
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fun requestRefresh() {
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if (runningJob?.isActive == true) {
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return
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}
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runningJob = refresh()
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}
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protected open fun refresh(): Job? = null
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@CallSuper
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override fun onCleared() {
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isConnected.removeOnPropertyChangedCallback(refreshCallback)
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super.onCleared()
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}
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fun withPermission(permission: String, callback: (Boolean) -> Unit) {
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PermissionEvent(permission, callback).publish()
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}
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fun withExternalRW(callback: () -> Unit) {
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withPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) {
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if (!it) {
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SnackbarEvent(R.string.external_rw_permission_denied).publish()
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} else {
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callback()
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}
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}
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}
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fun back() = BackPressEvent().publish()
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fun <Event : ViewEvent> Event.publish() {
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_viewEvents.postValue(this)
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}
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fun <Event : ViewEventWithScope> Event.publish() {
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scope = viewModelScope
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_viewEvents.postValue(this)
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}
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fun NavDirections.navigate() {
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_viewEvents.postValue(NavigationEvent(this))
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}
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}
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