Decouple state from BaseViewModel

app/src/main/java/com/topjohnwu/magisk/ui/superuser/SuperuserViewModel.kt

@@ -4,6 +4,7 @@ import android.annotation.SuppressLint
 import android.content.pm.PackageManager
 import android.content.pm.PackageManager.MATCH_UNINSTALLED_PACKAGES
 import android.os.Process
+import androidx.databinding.Bindable
 import androidx.databinding.ObservableArrayList
 import androidx.lifecycle.viewModelScope
 import com.topjohnwu.magisk.BR
@@ -14,10 +15,7 @@ import com.topjohnwu.magisk.core.di.AppContext
 import com.topjohnwu.magisk.core.model.su.SuPolicy
 import com.topjohnwu.magisk.core.utils.BiometricHelper
 import com.topjohnwu.magisk.core.utils.currentLocale
-import com.topjohnwu.magisk.databinding.AnyDiffRvItem
-import com.topjohnwu.magisk.databinding.MergeObservableList
-import com.topjohnwu.magisk.databinding.bindExtra
-import com.topjohnwu.magisk.databinding.diffListOf
+import com.topjohnwu.magisk.databinding.*
 import com.topjohnwu.magisk.events.SnackbarEvent
 import com.topjohnwu.magisk.events.dialog.BiometricEvent
 import com.topjohnwu.magisk.events.dialog.SuperuserRevokeDialog
@@ -45,15 +43,17 @@ class SuperuserViewModel(
         it.put(BR.listener, this)
     }
 
-    // ---
+    @get:Bindable
+    var loading = true
+        private set(value) = set(value, field, { field = it }, BR.loading)
 
     @SuppressLint("InlinedApi")
     override fun refresh() = viewModelScope.launch {
         if (!Utils.showSuperUser()) {
-            state = State.LOADING_FAILED
+            loading = false
             return@launch
         }
-        state = State.LOADING
+        loading = true
         val (policies, diff) = withContext(Dispatchers.IO) {
             db.deleteOutdated()
             db.delete(AppContext.applicationInfo.uid)
@@ -98,7 +98,7 @@ class SuperuserViewModel(
             itemsHelpers.clear()
         else if (itemsHelpers.isEmpty())
             itemsHelpers.add(itemNoData)
-        state = State.LOADED
+        loading = false
     }
 
     // ---