1 /* 2 * Copyright 2024 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 package com.android.photopicker.core.theme 17 18 import androidx.compose.material3.windowsizeclass.ExperimentalMaterial3WindowSizeClassApi 19 import androidx.compose.material3.windowsizeclass.WindowSizeClass 20 import androidx.compose.runtime.Composable 21 import androidx.compose.runtime.staticCompositionLocalOf 22 import androidx.compose.ui.graphics.toComposeRect 23 import androidx.compose.ui.platform.LocalContext 24 import androidx.compose.ui.platform.LocalDensity 25 import androidx.window.layout.WindowMetricsCalculator 26 import com.android.photopicker.core.configuration.LocalPhotopickerConfiguration 27 28 /** 29 * Provider for the [WindowSizeClass] inside of composables. A [staticCompositionLocalOf] is used 30 * here, due to the nature of WindowSizes; if the WindowSize is changing, recomposition is 31 * unavoidable so there is no sense in keeping track of references that use this value. 32 */ 33 val LocalWindowSizeClass = <lambda>null34 staticCompositionLocalOf<WindowSizeClass> { 35 throw IllegalStateException( 36 "No WindowSizeClass configured. Make sure to use LocalWindowSizeClass in a Composable" + 37 " surrounded by a PhotopickerTheme {}." 38 ) 39 } 40 41 /** 42 * Helper function which calculates a WindowSizeClass incorporating the window rect and 43 * [LocalDensity]. 44 * 45 * Note: This method observes [LocalPhotopickerConfiguration] and requires that to be provided 46 * higher in the tree. 47 */ 48 @OptIn(ExperimentalMaterial3WindowSizeClassApi::class) 49 @Composable calculateWindowSizeClassnull50fun calculateWindowSizeClass(): WindowSizeClass { 51 52 // Observe PhotopickerConfiguration changes and recalculate the size class on each change. 53 LocalPhotopickerConfiguration.current 54 55 val context = LocalContext.current 56 val density = LocalDensity.current 57 val metrics = WindowMetricsCalculator.getOrCreate().computeCurrentWindowMetrics(context) 58 val size = with(density) { metrics.bounds.toComposeRect().size.toDpSize() } 59 return WindowSizeClass.calculateFromSize(size) 60 } 61