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UiExtensions.kt
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UiExtensions.kt
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/*
* Copyright 2024 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.samples.apps.nowinandroid.util
import android.content.res.Configuration
import androidx.activity.ComponentActivity
import androidx.core.util.Consumer
import kotlinx.coroutines.channels.awaitClose
import kotlinx.coroutines.flow.callbackFlow
import kotlinx.coroutines.flow.conflate
import kotlinx.coroutines.flow.distinctUntilChanged
/**
* Convenience wrapper for dark mode checking
*/
val Configuration.isSystemInDarkTheme
get() = (uiMode and Configuration.UI_MODE_NIGHT_MASK) == Configuration.UI_MODE_NIGHT_YES
/**
* Registers listener for configuration changes to retrieve whether system is in dark theme or not.
* Immediately upon subscribing, it sends the current value and then registers listener for changes.
*/
fun ComponentActivity.isSystemInDarkTheme() = callbackFlow {
channel.trySend(resources.configuration.isSystemInDarkTheme)
val listener = Consumer<Configuration> {
channel.trySend(it.isSystemInDarkTheme)
}
addOnConfigurationChangedListener(listener)
awaitClose { removeOnConfigurationChangedListener(listener) }
}
.distinctUntilChanged()
.conflate()