System bars controller for android (Jetpack Compose)

SystemBarsController.kt

import android.app.Activity
import android.content.ContextWrapper
import androidx.compose.runtime.Composable
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberUpdatedState
import androidx.compose.runtime.setValue
import androidx.compose.ui.platform.LocalContext
import androidx.core.view.WindowCompat
import androidx.core.view.WindowInsetsCompat
import androidx.core.view.WindowInsetsControllerCompat

@Composable
fun rememberSystemBarsControllerState(
	initialNavigationBarVisibility: SystemBarsVisibility = SystemBarsVisibility.Visible,
	initialStatusBarVisibility: SystemBarsVisibility = SystemBarsVisibility.Visible,
): SystemBarsControllerState {
	return remember { SystemBarsControllerState(initialNavigationBarVisibility, initialStatusBarVisibility) }
}

@Composable
fun installSystemBarsController(
	state: SystemBarsControllerState = rememberSystemBarsControllerState()
) {

	val mState by rememberUpdatedState(newValue = state)

	val context = LocalContext.current

	val insetsController = remember(context) {
		val window = run {
			// Get activity from context
			while (context is ContextWrapper) {
				if (context is Activity) return@run context
				return@run context.baseContext as Activity
			}

			null
		}?.window ?: return@remember null

		WindowCompat.getInsetsController(window, window.decorView)
	}

	DisposableEffect(
		state.isNavigationBarVisible,
		state.isStatusBarVisible,
		state.isSystemBarVisible
	) {
		insetsController?.apply {
			systemBarsBehavior = if (mState.isSystemBarVisible) WindowInsetsControllerCompat.BEHAVIOR_DEFAULT
			else WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE

			if (mState.isNavigationBarVisible) show(WindowInsetsCompat.Type.navigationBars())
			else hide(WindowInsetsCompat.Type.navigationBars())

			if (mState.isStatusBarVisible) show(WindowInsetsCompat.Type.statusBars())
			else hide(WindowInsetsCompat.Type.statusBars())
		}

		onDispose {}
	}
}

enum class SystemBarsVisibility {
	Visible,
	Gone
}

class SystemBarsControllerState(
	initialNavigationBarVisibility: SystemBarsVisibility,
	initialStatusBarVisibility: SystemBarsVisibility
) {

	private var navigationBarVisibility by mutableStateOf(initialNavigationBarVisibility)
	private var statusBarVisibility by mutableStateOf(initialStatusBarVisibility)

	val isNavigationBarVisible: Boolean
		get() = navigationBarVisibility == SystemBarsVisibility.Visible

	val isStatusBarVisible: Boolean
		get() = statusBarVisibility == SystemBarsVisibility.Visible

	val isSystemBarVisible: Boolean
		get() = navigationBarVisibility == SystemBarsVisibility.Visible && statusBarVisibility == SystemBarsVisibility.Visible

	fun showNavigationBar() {
		navigationBarVisibility = SystemBarsVisibility.Visible
	}

	fun showStatusBar() {
		statusBarVisibility = SystemBarsVisibility.Visible
	}

	fun showSystemBar() {
		navigationBarVisibility = SystemBarsVisibility.Visible
		statusBarVisibility = SystemBarsVisibility.Visible
	}

	fun hideNavigationBar() {
		navigationBarVisibility = SystemBarsVisibility.Gone
	}

	fun hideStatusBar() {
		statusBarVisibility = SystemBarsVisibility.Gone
	}

	fun hideSystemBar() {
		navigationBarVisibility = SystemBarsVisibility.Gone
		statusBarVisibility = SystemBarsVisibility.Gone
	}

}

Demo

system.bars.controller.preview.mp4