[JEWEL-993] Add MacOS Scrollbar Detection to Standalone

Author: DanielSouzaBertoldi

platform/jewel/decorated-window/src/main/kotlin/org/jetbrains/jewel/window/TitleBar.MacOS.kt

@@ -12,8 +12,8 @@ import androidx.compose.ui.platform.debugInspectorInfo
 import androidx.compose.ui.unit.dp
 import com.jetbrains.JBR
 import org.jetbrains.jewel.foundation.theme.JewelTheme
+import org.jetbrains.jewel.intui.standalone.window.macos.MacPlatformServicesDefaultImpl
 import org.jetbrains.jewel.window.styling.TitleBarStyle
-import org.jetbrains.jewel.window.utils.macos.MacUtil
 
 public fun Modifier.newFullscreenControls(newControls: Boolean = true): Modifier =
     this then
@@ -70,7 +70,7 @@ internal fun DecoratedWindowScope.TitleBarOnMacOs(
             "apple.awt.newFullScreenControls.background",
             "${style.colors.fullscreenControlButtonsBackground.toArgb()}",
         )
-        MacUtil.updateColors(window)
+        MacPlatformServicesDefaultImpl.updateColors(window)
     } else {
         System.clearProperty("apple.awt.newFullScreenControls")
         System.clearProperty("apple.awt.newFullScreenControls.background")
@@ -84,7 +84,7 @@ internal fun DecoratedWindowScope.TitleBarOnMacOs(
         style = style,
         applyTitleBar = { height, state ->
             if (state.isFullscreen) {
-                MacUtil.updateFullScreenButtons(window)
+                MacPlatformServicesDefaultImpl.updateFullScreenButtons(window)
             }
             titleBar.height = height.value
             JBR.getWindowDecorations().setCustomTitleBar(window, titleBar)

platform/jewel/decorated-window/src/main/kotlin/org/jetbrains/jewel/window/TitleBar.kt

@@ -47,12 +47,12 @@ import kotlin.math.max
 import org.jetbrains.jewel.foundation.theme.JewelTheme
 import org.jetbrains.jewel.foundation.theme.LocalContentColor
 import org.jetbrains.jewel.foundation.theme.OverrideDarkMode
+import org.jetbrains.jewel.intui.standalone.window.macos.MacPlatformServicesDefaultImpl
 import org.jetbrains.jewel.ui.component.styling.LocalDefaultDropdownStyle
 import org.jetbrains.jewel.ui.component.styling.LocalIconButtonStyle
 import org.jetbrains.jewel.ui.util.isDark
 import org.jetbrains.jewel.window.styling.TitleBarStyle
 import org.jetbrains.jewel.window.utils.DesktopPlatform
-import org.jetbrains.jewel.window.utils.macos.MacUtil
 
 internal const val TITLE_BAR_COMPONENT_LAYOUT_ID_PREFIX = "__TITLE_BAR_"
 
@@ -186,7 +186,7 @@ internal class TitleBarMeasurePolicy(
 
         return layout(boxWidth, boxHeight) {
             if (state.isFullscreen) {
-                MacUtil.updateFullScreenButtons(window)
+                MacPlatformServicesDefaultImpl.updateFullScreenButtons(window)
             }
             val placeableGroups =
                 measuredPlaceable.groupBy { (measurable, _) ->

platform/jewel/decorated-window/src/main/kotlin/org/jetbrains/jewel/window/utils/macos/Foundation.kt

@@ -58,6 +58,7 @@ coroutines:
 
 exceptions:
   active: true
+  excludes: [ '**/test/**', '**/androidTest/**', '**/*.Test.kt', '**/*.Spec.kt', '**/*.Spek.kt' ]
   NotImplementedDeclaration:
     active: true
   ObjectExtendsThrowable:

platform/jewel/decorated-window/src/main/kotlin/org/jetbrains/jewel/window/utils/macos/MacUtil.kt

@@ -49,6 +49,8 @@ ktor-client-java = { module = "io.ktor:ktor-client-java", version = "3.0.3" }
 metalava = { module = "com.android.tools.metalava:metalava", version.ref = "metalava" }
 jsoup = { module = "org.jsoup:jsoup", version.ref = "jsoup" }
 mockk = { module = "io.mockk:mockk", version.ref = "mockk" }
+coroutines-core = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core" }
+coroutines-test = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-test" }
 
 # Plugin libraries for build-logic's convention plugins to use to resolve the types/tasks coming from these plugins
 detekt-gradlePlugin = { module = "io.gitlab.arturbosch.detekt:detekt-gradle-plugin", version.ref = "detekt" }

platform/jewel/detekt.yml

@@ -42,6 +42,10 @@ jvm_library(
     "@lib//:kotlin-test",
     "@lib//:junit5",
     "//platform/jewel/int-ui/int-ui-standalone:jewel-intUi-standalone",
+    "//libraries/kotlinx/coroutines/core",
+    "//libraries/kotlinx/coroutines/test",
+    "//platform/jewel/ui",
+    "//platform/jewel/ui:ui_test_lib",
   ],
   runtime_deps = [":jewel-intUi-standalone-tests"]
 )

platform/jewel/gradle/libs.versions.toml

@@ -4,6 +4,8 @@ dependencies {
     api(projects.intUi.intUiStandalone)
     testImplementation(kotlin("test"))
     testImplementation(libs.junit.jupiter)
+    testImplementation(libs.coroutines.core)
+    testImplementation(libs.coroutines.test)
     testRuntimeOnly(libs.junit.platform.engine)
     testRuntimeOnly(libs.junit.platform.launcher)
 }

platform/jewel/int-ui/int-ui-standalone-tests/BUILD.bazel

@@ -28,5 +28,8 @@
     <orderEntry type="library" scope="TEST" name="kotlin-test" level="project" />
     <orderEntry type="library" scope="TEST" name="JUnit5" level="project" />
     <orderEntry type="module" module-name="intellij.platform.jewel.intUi.standalone" />
+    <orderEntry type="module" module-name="intellij.libraries.kotlinx.coroutines.core" scope="TEST" />
+    <orderEntry type="module" module-name="intellij.libraries.kotlinx.coroutines.test" scope="TEST" />
+    <orderEntry type="module" module-name="intellij.platform.jewel.ui" scope="TEST" />
   </component>
 </module>

platform/jewel/int-ui/int-ui-standalone-tests/build.gradle.kts

@@ -0,0 +1,52 @@
+// Copyright 2000-2026 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
+package org.jetbrains.jewel.intui.standalone
+
+import kotlin.test.assertEquals
+import org.jetbrains.jewel.intui.standalone.fakes.FakeMacPlatformServices
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertDoesNotThrow
+import org.junit.jupiter.api.condition.DisabledOnOs
+import org.junit.jupiter.api.condition.EnabledOnOs
+import org.junit.jupiter.api.condition.OS
+
+internal class StandalonePlatformCursorControllerTest {
+    private lateinit var fakePlatformServices: FakeMacPlatformServices
+    private lateinit var controller: StandalonePlatformCursorController
+
+    @BeforeEach
+    fun setup() {
+        fakePlatformServices = FakeMacPlatformServices()
+        controller = StandalonePlatformCursorController(fakePlatformServices)
+    }
+
+    @Test
+    @EnabledOnOs(OS.MAC)
+    fun `verify hideCursorUntilMoved was called on macOS`() {
+        controller.hideCursor()
+
+        assertEquals(1, fakePlatformServices.hideCursorCalls, "Should have called native hide exactly once")
+    }
+
+    @Test
+    @DisabledOnOs(OS.MAC)
+    fun `verify hideCursorUntilMoved was not called on non-macOS`() {
+        controller.hideCursor()
+
+        assertEquals(0, fakePlatformServices.hideCursorCalls, "Should not call native hide on non-macOS")
+    }
+
+    @Test
+    fun `hideCursor should not throw even if native service fails`() {
+        val explodingFake =
+            object : FakeMacPlatformServices() {
+                override fun hideCursorUntilMoved() {
+                    @Suppress("") throw RuntimeException("Native library missing!")
+                }
+            }
+
+        val controller = StandalonePlatformCursorController(explodingFake)
+
+        assertDoesNotThrow { controller.hideCursor() }
+    }
+}