1 /* 2 * Copyright 2023 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.compose.windowsizeclass 18 19 import androidx.compose.material3.windowsizeclass.ExperimentalMaterial3WindowSizeClassApi 20 import androidx.compose.material3.windowsizeclass.WindowSizeClass 21 import androidx.compose.runtime.Composable 22 import androidx.compose.runtime.staticCompositionLocalOf 23 import androidx.compose.ui.graphics.toComposeRect 24 import androidx.compose.ui.platform.LocalConfiguration 25 import androidx.compose.ui.platform.LocalContext 26 import androidx.compose.ui.platform.LocalDensity 27 import androidx.window.layout.WindowMetricsCalculator 28 29 val LocalWindowSizeClass = <lambda>null30 staticCompositionLocalOf<WindowSizeClass> { 31 throw IllegalStateException( 32 "No WindowSizeClass configured. Make sure to use LocalWindowSizeClass in a Composable" + 33 " surrounded by a PlatformTheme {}." 34 ) 35 } 36 37 @OptIn(ExperimentalMaterial3WindowSizeClassApi::class) 38 @Composable calculateWindowSizeClassnull39fun calculateWindowSizeClass(): WindowSizeClass { 40 // Observe view configuration changes and recalculate the size class on each change. 41 LocalConfiguration.current 42 val density = LocalDensity.current 43 val context = LocalContext.current 44 val metrics = WindowMetricsCalculator.getOrCreate().computeCurrentWindowMetrics(context) 45 val size = with(density) { metrics.bounds.toComposeRect().size.toDpSize() } 46 return WindowSizeClass.calculateFromSize(size) 47 } 48