From 0e5a83a9c4fcb4f54994af61986bb26f0fccdbdd Mon Sep 17 00:00:00 2001
From: NUmeroAndDev <numero.dev.and@gmail.com>
Date: Sun, 11 Aug 2024 12:54:22 +0900
Subject: [PATCH] Support color constrast

---
 .../github/droidkaigi/confsched/KaigiApp.kt   | 24 ++++++++++++++++++-
 .../confsched/designsystem/theme/Theme.kt     | 14 ++++++++++-
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/app-android/src/main/java/io/github/droidkaigi/confsched/KaigiApp.kt b/app-android/src/main/java/io/github/droidkaigi/confsched/KaigiApp.kt
index e82982422..5777d9463 100644
--- a/app-android/src/main/java/io/github/droidkaigi/confsched/KaigiApp.kt
+++ b/app-android/src/main/java/io/github/droidkaigi/confsched/KaigiApp.kt
@@ -1,6 +1,7 @@
 package io.github.droidkaigi.confsched
 
 import android.annotation.SuppressLint
+import android.app.UiModeManager
 import android.content.ActivityNotFoundException
 import android.content.Context
 import android.content.Intent
@@ -14,6 +15,7 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.windowsizeclass.WindowSizeClass
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.ReadOnlyComposable
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
@@ -31,6 +33,7 @@ import io.github.droidkaigi.confsched.about.aboutScreenRoute
 import io.github.droidkaigi.confsched.about.navigateAboutScreen
 import io.github.droidkaigi.confsched.contributors.contributorsScreenRoute
 import io.github.droidkaigi.confsched.contributors.contributorsScreens
+import io.github.droidkaigi.confsched.designsystem.theme.ColorContrast
 import io.github.droidkaigi.confsched.designsystem.theme.KaigiTheme
 import io.github.droidkaigi.confsched.eventmap.eventMapScreens
 import io.github.droidkaigi.confsched.eventmap.navigateEventMapScreen
@@ -69,7 +72,9 @@ fun KaigiApp(
     displayFeatures: PersistentList<DisplayFeature>,
     modifier: Modifier = Modifier,
 ) {
-    KaigiTheme {
+    KaigiTheme(
+        colorContrast = colorContrast(),
+    ) {
         Surface(
             modifier = modifier.fillMaxSize(),
             color = MaterialTheme.colorScheme.background,
@@ -341,3 +346,20 @@ private class ExternalNavController(
             .launchUrl(context, uri)
     }
 }
+
+@Composable
+@ReadOnlyComposable
+private fun colorContrast(): ColorContrast {
+    val uiModeManager =
+        LocalContext.current.getSystemService(Context.UI_MODE_SERVICE) as UiModeManager
+    return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
+        when (uiModeManager.contrast) {
+            in 0.0f..0.33f -> ColorContrast.Default
+            in 0.34f..0.66f -> ColorContrast.Medium
+            in 0.67f..1.0f -> ColorContrast.High
+            else -> ColorContrast.Default
+        }
+    } else {
+        ColorContrast.Default
+    }
+}
diff --git a/core/designsystem/src/commonMain/kotlin/io/github/droidkaigi/confsched/designsystem/theme/Theme.kt b/core/designsystem/src/commonMain/kotlin/io/github/droidkaigi/confsched/designsystem/theme/Theme.kt
index b5082f359..a62b5fcde 100644
--- a/core/designsystem/src/commonMain/kotlin/io/github/droidkaigi/confsched/designsystem/theme/Theme.kt
+++ b/core/designsystem/src/commonMain/kotlin/io/github/droidkaigi/confsched/designsystem/theme/Theme.kt
@@ -8,6 +8,9 @@ import androidx.compose.material3.lightColorScheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.ui.graphics.Color
+import io.github.droidkaigi.confsched.designsystem.theme.ColorContrast.Default
+import io.github.droidkaigi.confsched.designsystem.theme.ColorContrast.High
+import io.github.droidkaigi.confsched.designsystem.theme.ColorContrast.Medium
 
 private val lightScheme = lightColorScheme(
     primary = primaryLight,
@@ -251,9 +254,14 @@ private val fixedAccentColors = FixedAccentColors(
 
 @Composable
 fun KaigiTheme(
+    colorContrast: ColorContrast = Default,
     content: @Composable () -> Unit,
 ) {
-    val colorScheme = darkScheme
+    val colorScheme = when (colorContrast) {
+        Default -> darkScheme
+        Medium -> mediumContrastDarkColorScheme
+        High -> highContrastDarkColorScheme
+    }
 
     MaterialTheme(
         colorScheme = colorScheme,
@@ -266,3 +274,7 @@ fun KaigiTheme(
         },
     )
 }
+
+enum class ColorContrast {
+    Default, Medium, High
+}