window_compose_remember

window_compose_remember.kt

/**
 * Copyright 2022 Google LLC.
 * SPDX-License-Identifier: Apache-2.0
 *
 * Remembers the [WindowSize] class for the window corresponding to the current window metrics.
 */
@Composable
fun Activity.rememberWindowSizeClass(): WindowSize {
    // Get the size (in pixels) of the window
    val windowSize = rememberWindowSize()

    // Convert the window size to [Dp]
    val windowDpSize = with(LocalDensity.current) {
        windowSize.toDpSize()
    }

    // Calculate the window size class
    return getWindowSizeClass(windowDpSize)
}

/**
 * Remembers the [Size] in pixels of the window corresponding to the current window metrics.
 */
@Composable
private fun Activity.rememberWindowSize(): Size {
    val configuration = LocalConfiguration.current
    // WindowMetricsCalculator implicitly depends on the configuration through the activity,
    // so re-calculate it upon changes.
    val windowMetrics = remember(configuration) {
        WindowMetricsCalculator.getOrCreate().computeCurrentWindowMetrics(this)
    }
    return windowMetrics.bounds.toComposeRect().size
}