Initial support for compose multiplatform

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

composeApp/build.gradle.kts

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+/*
+ * SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+import org.jetbrains.compose.desktop.application.dsl.TargetFormat
+
+plugins {
+    alias(libs.plugins.android.library)
+    alias(libs.plugins.jetbrains.kotlin.multiplatform)
+    alias(libs.plugins.jetbrains.kotlin.compose)
+    alias(libs.plugins.jetbrains.compose.multiplatform)
+    alias(libs.plugins.koin)
+}
+
+kotlin {
+    jvmToolchain(21)
+
+    compilerOptions {
+        optIn.addAll(
+            "androidx.compose.material3.ExperimentalMaterial3Api",
+            "androidx.compose.material3.ExperimentalMaterial3ExpressiveApi",
+            "androidx.compose.foundation.layout.ExperimentalLayoutApi"
+        )
+    }
+
+    android {
+        namespace = "net.newpipe.app"
+        compileSdk {
+            version = release(36) {
+                minorApiLevel = 1
+            }
+        }
+        minSdk = 23
+        androidResources {
+            enable = true
+        }
+    }
+
+    listOf(
+        iosArm64(),
+        iosSimulatorArm64()
+    ).forEach { iosTarget ->
+        iosTarget.binaries.framework {
+            baseName = "ComposeApp"
+            isStatic = true
+        }
+    }
+
+    jvm()
+
+    sourceSets {
+        commonMain.dependencies {
+            implementation(libs.jetbrains.compose.runtime)
+            implementation(libs.jetbrains.compose.foundation)
+            implementation(libs.jetbrains.compose.material3)
+            implementation(libs.jetbrains.compose.ui)
+            implementation(libs.jetbrains.compose.resources)
+            implementation(libs.jetbrains.compose.preview)
+
+            implementation(libs.jetbrains.lifecycle.viewmodel)
+
+            implementation(libs.jetbrains.navigation3.ui)
+            implementation(libs.jetbrains.lifecycle.navigation3)
+
+            implementation(libs.koin.compose.viewmodel)
+            implementation(libs.koin.annotations)
+        }
+        commonTest.dependencies {
+            implementation(libs.kotlin.test)
+        }
+        androidMain.dependencies {
+            implementation(libs.jetbrains.compose.preview)
+            implementation(libs.androidx.activity)
+        }
+        jvmMain.dependencies {
+            implementation(compose.desktop.currentOs)
+            implementation(libs.jetbrains.coroutines.swing)
+        }
+    }
+}
+
+dependencies {
+    androidRuntimeClasspath(libs.jetbrains.compose.tooling)
+}
+
+compose.desktop {
+    application {
+        mainClass = "net.newpipe.app.MainKt"
+
+        nativeDistributions {
+            targetFormats(TargetFormat.Dmg, TargetFormat.Msi, TargetFormat.Deb)
+            packageName = "net.newpipe.app"
+            packageVersion = "1.0.0"
+        }
+    }
+}
+
+koinCompiler {
+    userLogs = true // See what the compiler plugin detects
+}

composeApp/src/androidMain/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+  ~ SPDX-License-Identifier: GPL-3.0-or-later
+  -->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application>
+        <activity
+            android:name="net.newpipe.app.ComposeActivity"
+            android:exported="false" />
+    </application>
+</manifest>

composeApp/src/androidMain/kotlin/net/newpipe/app/ComposeActivity.kt

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+/*
+ * SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package net.newpipe.app
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.activity.enableEdgeToEdge
+
+/**
+ * Entry point for compose-related UI components on Android
+ */
+class ComposeActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        enableEdgeToEdge()
+        super.onCreate(savedInstanceState)
+
+        setContent {
+            App()
+        }
+    }
+}

composeApp/src/commonMain/composeResources/values/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+  ~ SPDX-License-Identifier: GPL-3.0-or-later
+  -->
+<resources>
+    <string name="app_name">NewPipe</string>
+</resources>

composeApp/src/commonMain/kotlin/net/newpipe/app/App.kt

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+/*
+ * SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package net.newpipe.app
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.tooling.preview.Preview
+import net.newpipe.app.di.KoinApp
+import net.newpipe.app.theme.AppTheme
+import org.koin.compose.KoinApplication
+import org.koin.plugin.module.dsl.koinConfiguration
+
+@Composable
+@Preview
+fun App() {
+    KoinApplication(configuration = koinConfiguration<KoinApp>()) {
+        AppTheme {
+
+        }
+    }
+}

composeApp/src/commonMain/kotlin/net/newpipe/app/di/KoinApp.kt

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+/*
+ * SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package net.newpipe.app.di
+
+import org.koin.core.annotation.KoinApplication
+
+/**
+ * Entry point for Koin-related configuration
+ */
+@KoinApplication
+object KoinApp

composeApp/src/commonMain/kotlin/net/newpipe/app/theme/Color.kt

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+/*
+ * SPDX-FileCopyrightText: 2024 NewPipe contributors <https://newpipe.net>
+ * SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package net.newpipe.app.theme
+
+import androidx.compose.ui.graphics.Color
+
+val primaryLight = Color(0xFF904A45)
+val onPrimaryLight = Color(0xFFFFFFFF)
+val primaryContainerLight = Color(0xFFFFDAD6)
+val onPrimaryContainerLight = Color(0xFF3B0908)
+val secondaryLight = Color(0xFF775653)
+val onSecondaryLight = Color(0xFFFFFFFF)
+val secondaryContainerLight = Color(0xFFFFDAD6)
+val onSecondaryContainerLight = Color(0xFF2C1513)
+val tertiaryLight = Color(0xFF725B2E)
+val onTertiaryLight = Color(0xFFFFFFFF)
+val tertiaryContainerLight = Color(0xFFFEDEA6)
+val onTertiaryContainerLight = Color(0xFF261900)
+val errorLight = Color(0xFFBA1A1A)
+val onErrorLight = Color(0xFFFFFFFF)
+val errorContainerLight = Color(0xFFFFDAD6)
+val onErrorContainerLight = Color(0xFF410002)
+val backgroundLight = Color(0xFFFFF8F7)
+val onBackgroundLight = Color(0xFF231918)
+val surfaceLight = Color(0xFFFFF8F7)
+val onSurfaceLight = Color(0xFF231918)
+val surfaceVariantLight = Color(0xFFF5DDDB)
+val onSurfaceVariantLight = Color(0xFF534342)
+val outlineLight = Color(0xFF857371)
+val outlineVariantLight = Color(0xFFD8C2BF)
+val scrimLight = Color(0xFF000000)
+val inverseSurfaceLight = Color(0xFF392E2D)
+val inverseOnSurfaceLight = Color(0xFFFFEDEB)
+val inversePrimaryLight = Color(0xFFFFB3AC)
+val surfaceDimLight = Color(0xFFE8D6D4)
+val surfaceBrightLight = Color(0xFFFFF8F7)
+val surfaceContainerLowestLight = Color(0xFFFFFFFF)
+val surfaceContainerLowLight = Color(0xFFFFF0EF)
+val surfaceContainerLight = Color(0xFFFCEAE8)
+val surfaceContainerHighLight = Color(0xFFF6E4E2)
+val surfaceContainerHighestLight = Color(0xFFF1DEDC)
+
+val primaryDark = Color(0xFFFFB3AC)
+val onPrimaryDark = Color(0xFF571E1B)
+val primaryContainerDark = Color(0xFF73332F)
+val onPrimaryContainerDark = Color(0xFFFFDAD6)
+val secondaryDark = Color(0xFFE7BDB8)
+val onSecondaryDark = Color(0xFF442927)
+val secondaryContainerDark = Color(0xFF5D3F3C)
+val onSecondaryContainerDark = Color(0xFFFFDAD6)
+val tertiaryDark = Color(0xFFE1C38C)
+val onTertiaryDark = Color(0xFF402D04)
+val tertiaryContainerDark = Color(0xFF584419)
+val onTertiaryContainerDark = Color(0xFFFEDEA6)
+val errorDark = Color(0xFFFFB4AB)
+val onErrorDark = Color(0xFF690005)
+val errorContainerDark = Color(0xFF93000A)
+val onErrorContainerDark = Color(0xFFFFDAD6)
+val backgroundDark = Color(0xFF1A1110)
+val onBackgroundDark = Color(0xFFF1DEDC)
+val surfaceDark = Color(0xFF1A1110)
+val onSurfaceDark = Color(0xFFF1DEDC)
+val surfaceVariantDark = Color(0xFF534342)
+val onSurfaceVariantDark = Color(0xFFD8C2BF)
+val outlineDark = Color(0xFFA08C8A)
+val outlineVariantDark = Color(0xFF534342)
+val scrimDark = Color(0xFF000000)
+val inverseSurfaceDark = Color(0xFFF1DEDC)
+val inverseOnSurfaceDark = Color(0xFF392E2D)
+val inversePrimaryDark = Color(0xFF904A45)
+val surfaceDimDark = Color(0xFF1A1110)
+val surfaceBrightDark = Color(0xFF423735)
+val surfaceContainerLowestDark = Color(0xFF140C0B)
+val surfaceContainerLowDark = Color(0xFF231918)
+val surfaceContainerDark = Color(0xFF271D1C)
+val surfaceContainerHighDark = Color(0xFF322827)
+val surfaceContainerHighestDark = Color(0xFF3D3231)

composeApp/src/commonMain/kotlin/net/newpipe/app/theme/Theme.kt

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+/*
+ * SPDX-FileCopyrightText: 2024 NewPipe contributors <https://newpipe.net>
+ * SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package net.newpipe.app.theme
+
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material3.MaterialExpressiveTheme
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.material3.lightColorScheme
+import androidx.compose.runtime.Composable
+
+private val lightScheme = lightColorScheme(
+    primary = primaryLight,
+    onPrimary = onPrimaryLight,
+    primaryContainer = primaryContainerLight,
+    onPrimaryContainer = onPrimaryContainerLight,
+    secondary = secondaryLight,
+    onSecondary = onSecondaryLight,
+    secondaryContainer = secondaryContainerLight,
+    onSecondaryContainer = onSecondaryContainerLight,
+    tertiary = tertiaryLight,
+    onTertiary = onTertiaryLight,
+    tertiaryContainer = tertiaryContainerLight,
+    onTertiaryContainer = onTertiaryContainerLight,
+    error = errorLight,
+    onError = onErrorLight,
+    errorContainer = errorContainerLight,
+    onErrorContainer = onErrorContainerLight,
+    background = backgroundLight,
+    onBackground = onBackgroundLight,
+    surface = surfaceLight,
+    onSurface = onSurfaceLight,
+    surfaceVariant = surfaceVariantLight,
+    onSurfaceVariant = onSurfaceVariantLight,
+    outline = outlineLight,
+    outlineVariant = outlineVariantLight,
+    scrim = scrimLight,
+    inverseSurface = inverseSurfaceLight,
+    inverseOnSurface = inverseOnSurfaceLight,
+    inversePrimary = inversePrimaryLight,
+    surfaceDim = surfaceDimLight,
+    surfaceBright = surfaceBrightLight,
+    surfaceContainerLowest = surfaceContainerLowestLight,
+    surfaceContainerLow = surfaceContainerLowLight,
+    surfaceContainer = surfaceContainerLight,
+    surfaceContainerHigh = surfaceContainerHighLight,
+    surfaceContainerHighest = surfaceContainerHighestLight,
+)
+
+private val darkScheme = darkColorScheme(
+    primary = primaryDark,
+    onPrimary = onPrimaryDark,
+    primaryContainer = primaryContainerDark,
+    onPrimaryContainer = onPrimaryContainerDark,
+    secondary = secondaryDark,
+    onSecondary = onSecondaryDark,
+    secondaryContainer = secondaryContainerDark,
+    onSecondaryContainer = onSecondaryContainerDark,
+    tertiary = tertiaryDark,
+    onTertiary = onTertiaryDark,
+    tertiaryContainer = tertiaryContainerDark,
+    onTertiaryContainer = onTertiaryContainerDark,
+    error = errorDark,
+    onError = onErrorDark,
+    errorContainer = errorContainerDark,
+    onErrorContainer = onErrorContainerDark,
+    background = backgroundDark,
+    onBackground = onBackgroundDark,
+    surface = surfaceDark,
+    onSurface = onSurfaceDark,
+    surfaceVariant = surfaceVariantDark,
+    onSurfaceVariant = onSurfaceVariantDark,
+    outline = outlineDark,
+    outlineVariant = outlineVariantDark,
+    scrim = scrimDark,
+    inverseSurface = inverseSurfaceDark,
+    inverseOnSurface = inverseOnSurfaceDark,
+    inversePrimary = inversePrimaryDark,
+    surfaceDim = surfaceDimDark,
+    surfaceBright = surfaceBrightDark,
+    surfaceContainerLowest = surfaceContainerLowestDark,
+    surfaceContainerLow = surfaceContainerLowDark,
+    surfaceContainer = surfaceContainerDark,
+    surfaceContainerHigh = surfaceContainerHighDark,
+    surfaceContainerHighest = surfaceContainerHighestDark,
+)
+
+@Composable
+fun AppTheme(useDarkTheme: Boolean = isSystemInDarkTheme(), content: @Composable () -> Unit) {
+    MaterialExpressiveTheme(
+        colorScheme = when {
+            !useDarkTheme -> lightScheme
+            else -> darkScheme
+        },
+        content = content
+    )
+}

composeApp/src/iosMain/kotlin/net/newpipe/app/MainViewController.kt

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+/*
+ * SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package net.newpipe.app
+
+import androidx.compose.ui.window.ComposeUIViewController
+
+fun MainViewController() = ComposeUIViewController { App() }

composeApp/src/jvmMain/kotlin/net/newpipe/app/main.kt

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+/*
+ * SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package net.newpipe.app
+
+import androidx.compose.ui.window.Window
+import androidx.compose.ui.window.application
+import newpipe.composeapp.generated.resources.Res
+import newpipe.composeapp.generated.resources.app_name
+import org.jetbrains.compose.resources.stringResource
+
+/**
+ * Entry point for compose-related UI components on Desktop
+ */
+fun main() = application {
+    Window(onCloseRequest = ::exitApplication, title = stringResource(Res.string.app_name)) {
+        App()
+    }
+}