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Building a macOS
screen saver
with Kotlin
Márton Braun
Developer Advocate
JetBrains @zsmb13
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class KotlinLogosView : ScreenSaverView {
}
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class KotlinLogosView : ScreenSaverView {
override init?(frame: NSRect, isPreview: Bool) {
super.init(frame: frame, isPreview: isPreview)
animationTimeInterval = 1 / 60.0
}
}
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class KotlinLogosView : ScreenSaverView {
override init?(frame: NSRect, isPreview: Bool) {
super.init(frame: frame, isPreview: isPreview)
animationTimeInterval = 1 / 60.0
}
required init?(coder decoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
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class KotlinLogosView : ScreenSaverView {
override init?(frame: NSRect, isPreview: Bool) {
super.init(frame: frame, isPreview: isPreview)
animationTimeInterval = 1 / 60.0
}
required init?(coder decoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func animateOneFrame() {
super.animateOneFrame()
}
}
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class KotlinLogosView : ScreenSaverView {
override init?(frame: NSRect, isPreview: Bool) {
super.init(frame: frame, isPreview: isPreview)
animationTimeInterval = 1 / 60.0
}
required init?(coder decoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func animateOneFrame() {
super.animateOneFrame()
}
override var hasConfigureSheet: Bool { return false }
override var configureSheet: NSWindow? { return nil }
}
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import org.jetbrains.kotlin.gradle.plugin.mpp.apple.XCFramework
plugins {
kotlin("multiplatform") version "2.1.10"
}
kotlin {
val xcf = XCFramework("KotlinLogo")
val targets = listOf(macosX64(), macosArm64())
targets.forEach { target ->
target.binaries.framework {
binaryOption("bundleId", "co.zsmb.KotlinLogos")
baseName = "KotlinLogo"
isStatic = true
xcf.add(this)
}
}
}
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Xcode project Gradle project
ScreenSaverView KotlinScreenSaverView
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let bundle: NSBundle = Bundle(for: type(of: self))
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let bundle: NSBundle = Bundle(for: type(of: self))
val bundle: NSBundle =
NSBundle.bundleWithIdentifier("co.zsmb.KotlinLogos")
import platform.Foundation.NSBundle
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let bundle: NSBundle = Bundle(for: type(of: self))
let image: NSImage = bundle.image(forResource: "kotlin0")
val bundle: NSBundle =
NSBundle.bundleWithIdentifier("co.zsmb.KotlinLogos")
import platform.Foundation.NSBundle
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let bundle: NSBundle = Bundle(for: type(of: self))
let image: NSImage = bundle.image(forResource: "kotlin0")
val bundle: NSBundle =
NSBundle.bundleWithIdentifier("co.zsmb.KotlinLogos")
val image: NSImage = bundle.imageForResource("kotlin0")
import platform.AppKit.NSImage
import platform.AppKit.imageForResource
import platform.Foundation.NSBundle
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let bundle: NSBundle = Bundle(for: type(of: self))
let image: NSImage = bundle.image(forResource: "kotlin0")
val bundle: NSBundle =
NSBundle.bundleWithIdentifier("co.zsmb.KotlinLogos")
val image: NSImage = bundle.imageForResource("kotlin0")
import platform.AppKit.NSImage
import platform.AppKit.imageForResource
import platform.Foundation.NSBundle
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import platform.AppKit.NSImageView
import platform.Foundation.NSMakeRect
val imageView = NSImageView().apply {
image = logoImage
frame = NSMakeRect(x = 300.0, y = 300.0, w = 200.0, h = 200.0)
}
screenSaverView.addSubview(imageView)
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import platform.AppKit.NSImageView
import platform.Foundation.NSMakeRect
val imageView = NSImageView().apply {
image = logoImage
frame = NSMakeRect(x = 300.0, y = 300.0, w = 200.0, h = 200.0)
}
screenSaverView.addSubview(imageView)
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import platform.AppKit.NSImageView
import platform.Foundation.NSMakeRect
val imageView = NSImageView().apply {
image = logoImage
frame = NSMakeRect(x = 300.0, y = 300.0, w = 200.0, h = 200.0)
}
screenSaverView.addSubview(imageView)
val frame = NSMakeRect(x = newX, y = newY, w = 200.0, h = 200.0)
imageView.frame = frame
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Delete your old output files before running a new build
Build your project
Go to Activity Monitor and force quit all legacyScreenSaver processes
Go to System Settings, choose any other screen saver
Delete your custom screen saver from System Settings
Quit System Settings
Install your new screen saver
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Build your project
Go to Activity Monitor and force quit all legacyScreenSaver processes
Go to System Settings, choose any other screen saver
Delete your custom screen saver from System Settings
Quit System Settings
Install your new screen saver
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import platform.Foundation.NSUserDefaults
class LongUserDefaultDelegate : ReadWriteProperty {
private val userDefaults = NSUserDefaults()
override fun getValue(!!..., property: KProperty!!<*>): Long {
return userDefaults.objectForKey(property.name) as? Long !?: 0L
}
override fun setValue(!!..., property: KProperty!!<*>, value: Long) {
userDefaults.setInteger(value, forKey = property.name)
}
}
object Preferences {
var LOGO_SET by LongUserDefaultDelegate(0)
var LOGO_SIZE by LongUserDefaultDelegate(200)
var LOGO_COUNT by LongUserDefaultDelegate(1)
var SPEED by LongUserDefaultDelegate(10)
}
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import platform.Foundation.NSUserDefaults
class LongUserDefaultDelegate : ReadWriteProperty {
private val userDefaults = NSUserDefaults()
override fun getValue(!!..., property: KProperty!!<*>): Long {
return userDefaults.objectForKey(property.name) as? Long !?: 0L
}
override fun setValue(!!..., property: KProperty!!<*>, value: Long) {
userDefaults.setInteger(value, forKey = property.name)
}
}
object Preferences {
var LOGO_SET by LongUserDefaultDelegate(0)
var LOGO_SIZE by LongUserDefaultDelegate(200)
var LOGO_COUNT by LongUserDefaultDelegate(1)
var SPEED by LongUserDefaultDelegate(10)
}
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import platform.Foundation.NSUserDefaults
class LongUserDefaultDelegate : ReadWriteProperty {
private val userDefaults = NSUserDefaults()
override fun getValue(!!..., property: KProperty!!<*>): Long {
return userDefaults.objectForKey(property.name) as? Long !?: 0L
}
override fun setValue(!!..., property: KProperty!!<*>, value: Long) {
userDefaults.setInteger(value, forKey = property.name)
}
}
object Preferences {
var LOGO_SET by LongUserDefaultDelegate(0)
var LOGO_SIZE by LongUserDefaultDelegate(200)
var LOGO_COUNT by LongUserDefaultDelegate(1)
var SPEED by LongUserDefaultDelegate(10)
}
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import platform.Foundation.NSNotificationCenter
import platform.Foundation.NSUserDefaultsDidChangeNotification
NSNotificationCenter.defaultCenter.addObserverForName(
name = NSUserDefaultsDidChangeNotification
) {
reinitialize()
}
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import platform.AppKit.NSModalResponseOK
import platform.AppKit.NSOpenPanel
import platform.Foundation.NSURL
val openPanel = NSOpenPanel().apply {
allowsMultipleSelection = false
canChooseDirectories = true
canCreateDirectories = false
canChooseFiles = false
}
openPanel.beginWithCompletionHandler { response ->
if (response !== NSModalResponseOK !&&
openPanel.URLs.isNotEmpty()) {
val url = openPanel.URLs.first() as NSURL
!!...
}
}
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import platform.Foundation.NSDirectoryEnumerationSkipsHiddenFiles
import platform.Foundation.NSDirectoryEnumerationSkipsSubdirectoryDes
import platform.Foundation.NSFileManager
import platform.Foundation.NSURL
val enum = NSFileManager.defaultManager.enumeratorAtURL(
url = NSURL(string = folderUrl),
includingPropertiesForKeys = null,
options = NSDirectoryEnumerationSkipsHiddenFiles or
NSDirectoryEnumerationSkipsSubdirectoryDescendants,
errorHandler = null
)
var next = enum.nextObject()
while (next !!= null) {
!// !!...
next = enum.nextObject()
}
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import platform.Foundation.NSDirectoryEnumerationSkipsHiddenFiles
import platform.Foundation.NSDirectoryEnumerationSkipsSubdirectoryDes
import platform.Foundation.NSFileManager
import platform.Foundation.NSURL
val enum = NSFileManager.defaultManager.enumeratorAtURL(
url = NSURL(string = folderUrl),
includingPropertiesForKeys = null,
options = NSDirectoryEnumerationSkipsHiddenFiles or
NSDirectoryEnumerationSkipsSubdirectoryDescendants,
errorHandler = null
)
var next = enum.nextObject()
while (next !!= null) {
!// !!...
next = enum.nextObject()
}
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legacyScreenSaver
ScreenSaverView
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legacyScreenSaver
ScreenSaverView
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legacyScreenSaver
ScreenSaverView
ScreenSaverView
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legacyScreenSaver
ScreenSaverView
ScreenSaverView
ScreenSaverView
ScreenSaverView
ScreenSaverView
ScreenSaverView
ScreenSaverView
ScreenSaverView
ScreenSaverView
ScreenSaverView
ScreenSaverView
ScreenSaverView
ScreenSaverView
ScreenSaverView
ScreenSaverVie
ScreenSaverVi
ScreenSaverV
ScreenSaver
ScreenSav
ScreenSa
ScreenS
Screen
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class KotlinLogosView: ScreenSaverView {
@objc func willStop(_ aNotification: Notification) {
if (!isPreview) {
self.removeFromSuperview()
}
}
}
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class KotlinLogosView: ScreenSaverView {
@objc func willStop(_ aNotification: Notification) {
if (!isPreview) {
NSApplication.shared.terminate(nil)
}
}
}
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Do not try building a macOS
screen saver
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Do not try building a macOS
screen saver
Don’t be afraid to use
interop with Kotlin/Native
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Do not try building a macOS
screen saver
Don’t be afraid to use
interop with Kotlin/Native
Put some Kotlin logos on
your machine!
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Why isn’t this screensaver built
with ?!
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Do not try building a macOS
screen saver
Don’t be afraid to use
interop with Kotlin/Native
Put some Kotlin logos on
your machine!
Maybe build a cool screen
saver with Compose?
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… and don’t
forget to vote!
github.com/zsmb13/KotlinLogo-ScreenSaver/
zsmb.co/talks
Márton Braun
@zsmb13.co