Set SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR when necessary

java/src/org/futo/inputmethod/latin/LatinIME.kt

@@ -1,6 +1,7 @@
 package org.futo.inputmethod.latin
 
 import android.content.res.Configuration
+import android.graphics.Color
 import android.inputmethodservice.InputMethodService
 import android.os.Build
 import android.os.Bundle
@@ -66,6 +67,7 @@ import org.futo.inputmethod.latin.uix.setSetting
 import org.futo.inputmethod.latin.uix.theme.DarkColorScheme
 import org.futo.inputmethod.latin.uix.theme.ThemeOption
 import org.futo.inputmethod.latin.uix.theme.ThemeOptions
+import org.futo.inputmethod.latin.uix.theme.applyWindowColors
 import org.futo.inputmethod.latin.uix.theme.presets.VoiceInputTheme
 import org.futo.inputmethod.latin.xlm.LanguageModelFacilitator
 import org.futo.inputmethod.updates.scheduleUpdateCheckingJob
@@ -132,11 +134,26 @@ class LatinIME : InputMethodService(), LifecycleOwner, ViewModelStoreOwner, Save
         Log.w("LatinIME", "Recreating keyboard")
     }
 
+    private var isNavigationBarVisible = false
+    fun updateNavigationBarVisibility(visible: Boolean? = null) {
+        if(visible != null) isNavigationBarVisible = visible
+
+        val color = drawableProvider?.primaryKeyboardColor
+
+        window.window?.let { window ->
+            if(color == null || !isNavigationBarVisible) {
+                applyWindowColors(window, Color.TRANSPARENT, statusBar = false)
+            } else {
+                applyWindowColors(window, color, statusBar = false)
+            }
+        }
+    }
+
     private fun updateDrawableProvider(colorScheme: ColorScheme) {
         activeColorScheme = colorScheme
         drawableProvider = BasicThemeProvider(this, overrideColorScheme = colorScheme)
 
-        window.window?.navigationBarColor = drawableProvider!!.primaryKeyboardColor
+        updateNavigationBarVisibility()
         uixManager.onColorSchemeChanged()
     }
 

java/src/org/futo/inputmethod/latin/LatinIMELegacy.java

@@ -2040,13 +2040,7 @@ public class LatinIMELegacy implements KeyboardActionListener,
     }
 
     private void setNavigationBarVisibility(final boolean visible) {
-        int color = ((DynamicThemeProviderOwner)getInputMethodService()).getDrawableProvider().getPrimaryKeyboardColor();
+        ((LatinIME)mInputMethodService).updateNavigationBarVisibility(visible);
-        if (BuildCompatUtils.EFFECTIVE_SDK_INT > Build.VERSION_CODES.M) {
-            // For N and later, IMEs can specify Color.TRANSPARENT to make the navigation bar
-            // transparent.  For other colors the system uses the default color.
-            mInputMethodService.getWindow().getWindow().setNavigationBarColor(
-                    visible ? color : Color.TRANSPARENT);
-        }
     }
 
     public InputMethodService getInputMethodService() {

java/src/org/futo/inputmethod/latin/uix/theme/Theme.kt

@@ -1,22 +1,18 @@
 package org.futo.inputmethod.latin.uix.theme
 
 import android.app.Activity
-import android.content.Context
 import android.os.Build
-import android.view.WindowManager
+import android.view.View
+import android.view.Window
+import androidx.annotation.ColorInt
 import androidx.compose.material3.ColorScheme
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.darkColorScheme
-import androidx.compose.material3.dynamicDarkColorScheme
-import androidx.compose.material3.dynamicLightColorScheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.SideEffect
-import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.toArgb
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.platform.LocalView
+import kotlin.math.sqrt
-import androidx.core.view.WindowCompat
 
 val DarkColorScheme = darkColorScheme(
     primary = Slate600,
@@ -49,14 +45,28 @@ val DarkColorScheme = darkColorScheme(
     onSurfaceVariant = Slate300
 )
 
-fun applyWindowColors(context: Context, backgroundColor: Color) {
+fun applyWindowColors(window: Window, @ColorInt color: Int, statusBar: Boolean) {
-    val window = (context as Activity).window
+    if(statusBar) {
-    val color = backgroundColor.copy(alpha = 0.75f).toArgb()
+        window.statusBarColor = color
-
+    }
-    window.statusBarColor = color
     window.navigationBarColor = color
 
-    window.addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND)
+    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+        val view = window.decorView
+        val uiFlags = view.systemUiVisibility
+
+        val luminance = sqrt(
+            0.299 * android.graphics.Color.red(color) / 255.0
+                    + 0.587 * android.graphics.Color.green(color) / 255.0
+                    + 0.114 * android.graphics.Color.blue(color) / 255.0
+        )
+
+        if (luminance > 0.5 && color != android.graphics.Color.TRANSPARENT) {
+            view.systemUiVisibility = uiFlags or View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR
+        } else {
+            view.systemUiVisibility = uiFlags and (View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR.inv())
+        }
+    }
 }
 
 @Composable
@@ -64,7 +74,7 @@ fun StatusBarColorSetter() {
     val backgroundColor = MaterialTheme.colorScheme.background
     val context = LocalContext.current
     LaunchedEffect(backgroundColor) {
-        applyWindowColors(context, backgroundColor)
+        applyWindowColors((context as Activity).window, backgroundColor.toArgb(), statusBar = false)
     }
 }