From 7207da8df4e43daea19b0207663e6bb1a2f03fab Mon Sep 17 00:00:00 2001
From: Jays2Kings <jays@outlook.com>
Date: Thu, 30 Sep 2021 15:29:01 -0400
Subject: [PATCH] Use webpage's dark theme (if applicable) automatically if app
 is in dark mode

So far only mangadex is the one I know with good support but its here now
---
 app/build.gradle.kts                          |  1 +
 .../ui/webview/BaseWebViewActivity.kt         | 20 ++++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 963bcfe415..5cd879079a 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -102,6 +102,7 @@ dependencies {
     implementation("androidx.appcompat:appcompat:1.3.1")
     implementation("androidx.cardview:cardview:1.0.0")
     implementation("com.google.android.material:material:1.4.0")
+    implementation("androidx.webkit:webkit:1.4.0")
     implementation("androidx.recyclerview:recyclerview:1.2.1")
     implementation("androidx.preference:preference:1.1.1")
     implementation("androidx.annotation:annotation:1.2.0")
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/webview/BaseWebViewActivity.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/webview/BaseWebViewActivity.kt
index af5a688b2b..2c1c5f2346 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/webview/BaseWebViewActivity.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/webview/BaseWebViewActivity.kt
@@ -16,6 +16,8 @@ import androidx.core.net.toUri
 import androidx.core.view.isInvisible
 import androidx.core.view.isVisible
 import androidx.core.view.updateLayoutParams
+import androidx.webkit.WebSettingsCompat.*
+import androidx.webkit.WebViewFeature
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.databinding.WebviewActivityBinding
 import eu.kanade.tachiyomi.ui.base.activity.BaseActivity
@@ -104,6 +106,7 @@ open class BaseWebViewActivity : BaseActivity<WebviewActivityBinding>() {
             insets
         }
 
+        setWebDarkMode()
         binding.swipeRefresh.isEnabled = false
 
         if (bundle == null) {
@@ -134,6 +137,21 @@ open class BaseWebViewActivity : BaseActivity<WebviewActivityBinding>() {
         }
     }
 
+    private fun setWebDarkMode() {
+        if (WebViewFeature.isFeatureSupported(WebViewFeature.FORCE_DARK_STRATEGY)) {
+            setForceDarkStrategy(
+                binding.webview.settings,
+                DARK_STRATEGY_WEB_THEME_DARKENING_ONLY
+            )
+            if (WebViewFeature.isFeatureSupported(WebViewFeature.FORCE_DARK)) {
+                setForceDark(
+                    binding.webview.settings,
+                    if (isInNightMode()) FORCE_DARK_ON else FORCE_DARK_OFF
+                )
+            }
+        }
+    }
+
     override fun onProvideAssistContent(outContent: AssistContent?) {
         super.onProvideAssistContent(outContent)
         binding.webview.url?.let { outContent?.webUri = it.toUri() }
@@ -159,7 +177,7 @@ open class BaseWebViewActivity : BaseActivity<WebviewActivityBinding>() {
             getResourceColor(R.attr.colorSurface),
             255
         )
-        binding.toolbar.setBackgroundColor(getResourceColor(R.attr.colorSecondary))
+        setWebDarkMode()
         binding.toolbar.setBackgroundColor(getResourceColor(R.attr.colorSurface))
         binding.toolbar.popupTheme = if (lightMode) R.style.ThemeOverlay_MaterialComponents else R
             .style.ThemeOverlay_MaterialComponents_Dark