Show hidden app count in preference

lawnchair/res/values/strings.xml

@@ -77,4 +77,8 @@
     <string name="product">Product</string>
     <string name="app_drawer_section_apps">Apps</string>
     <string name="hidden_apps_label">Hidden apps</string>
+    <plurals name="hidden_apps_count">
+        <item quantity="one">%1$d app hidden</item>
+        <item quantity="other">%1$d apps hidden</item>
+    </plurals>
 </resources>

lawnchair/src/app/lawnchair/ui/preferences/AppDrawerPreferences.kt

@@ -86,6 +86,7 @@ fun AppDrawerPreferences() {
         PreferenceGroup(heading = stringResource(id = R.string.app_drawer_section_apps)) {
             NavigationActionPreference(
                 label = stringResource(id = R.string.hidden_apps_label),
+                subtitle = hiddenAppsCount(),
                 destination = subRoute(name = AppDrawerRoutes.HIDDEN_APPS),
                 showDivider = false
             )

lawnchair/src/app/lawnchair/ui/preferences/HiddenAppsPreferences.kt

@@ -4,11 +4,12 @@ import androidx.compose.animation.ExperimentalAnimationApi
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
-import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.platform.LocalContext
 import androidx.navigation.NavGraphBuilder
 import app.lawnchair.ui.preferences.components.*
 import app.lawnchair.util.*
 import app.lawnchair.util.preferences.getAdapter
+import app.lawnchair.util.preferences.getState
 import app.lawnchair.util.preferences.preferenceManager
 import com.android.launcher3.R
 import java.util.*
@@ -22,7 +23,7 @@ fun NavGraphBuilder.hiddenAppsGraph(route: String) {
 @ExperimentalAnimationApi
 @Composable
 fun HiddenAppsPreferences() {
-    pageMeta.provide(Meta(title = stringResource(id = R.string.hidden_apps_label)))
+    pageMeta.provide(Meta(title = hiddenAppsCount()))
     var hiddenApps by preferenceManager().hiddenAppSet.getAdapter()
     val optionalApps by appsList(
         filter = defaultAppFilter(),
@@ -52,6 +53,15 @@ fun HiddenAppsPreferences() {
     }
 }
 
+@Composable
+fun hiddenAppsCount(): String {
+    val resources = LocalContext.current.resources
+    val count = preferenceManager().hiddenAppSet.getState().value.size
+    return remember(count) {
+        resources.getQuantityString(R.plurals.hidden_apps_count, count, count)
+    }
+}
+
 @Composable
 fun hiddenAppsComparator(hiddenApps: Set<String>): Comparator<App> {
     return remember {

lawnchair/src/app/lawnchair/util/preferences/PreferenceAdapter.kt

@@ -10,18 +10,19 @@ class PreferenceAdapter<T>(
     private val get: () -> T,
     private val set: (T) -> Unit
 ) : BasePreferenceManager.PreferenceChangeListener {
-    val state = mutableStateOf(get())
+    private val stateInternal = mutableStateOf(get())
+    val state: State<T> get() = stateInternal
 
     fun onChange(newValue: T) {
         set(newValue)
-        state.value = newValue
+        stateInternal.value = newValue
     }
 
     override fun onPreferenceChange(pref: BasePreferenceManager.PrefEntry<*>) {
-        state.value = get()
+        stateInternal.value = get()
     }
 
-    operator fun getValue(thisObj: Any?, property: KProperty<*>): T = state.value
+    operator fun getValue(thisObj: Any?, property: KProperty<*>): T = stateInternal.value
     operator fun setValue(thisObj: Any?, property: KProperty<*>, newValue: T) {
         onChange(newValue)
     }
@@ -39,6 +40,9 @@ fun <T> BasePreferenceManager.PrefEntry<T>.getAdapter(): PreferenceAdapter<T> {
     return getAdapter(this, ::get, ::set)
 }
 
+@Composable
+fun <T> BasePreferenceManager.PrefEntry<T>.getState() = getAdapter().state
+
 @Composable
 fun <T> BasePreferenceManager.PrefEntry<T>.observeAsState(): State<T> {
     return getAdapter().state