Clicklight Macos Click Highlighter

ClickLight macOS Click Highlighter Skill

Skill by ara.so — Devtools Skills collection.

Overview

ClickLight is a native macOS menu bar application written in Swift that provides real-time click highlighting for live demos, screen sharing, UX reviews, and presentations. Unlike screen recorders that add click effects in post-production, ClickLight shows visual feedback during the live moment itself.

Key features:

• Real-time click highlights with separate visuals for press, release, right-click, and drag
• Optional laser pointer mode with fading freehand strokes
• Customizable size, duration, intensity, and color
• Native Swift/AppKit implementation
• Menu bar integration with quick presets

Installation

Homebrew (Recommended)

# Add tap and install
brew tap aurorascharff/clicklight https://github.com/aurorascharff/ClickLight
brew install --cask aurorascharff/clicklight/clicklight

# Update later
brew upgrade --cask clicklight

# Uninstall
brew uninstall --cask clicklight

# Uninstall with preferences
brew uninstall --cask --zap clicklight

Manual Installation

Download ClickLight.zip from GitHub Releases, extract, and move ClickLight.app to /Applications.

Building from Source

# Clone repository
git clone https://github.com/aurorascharff/ClickLight.git
cd ClickLight

# Build with Swift
swift build -c release

# Or use the Makefile
make build

# Install to Applications
make install

# Run directly
make run

Required Permissions

ClickLight requires Accessibility permission to detect clicks system-wide.

Setup:

1. Launch ClickLight (you'll be prompted for permission)
2. Go to System Settings → Privacy & Security → Accessibility
3. Enable ClickLight in the list
4. Quit and relaunch ClickLight from the menu bar

If clicks aren't being detected, verify the permission is enabled and restart the app.

Project Structure

ClickLight/
├── Sources/
│   └── ClickLight/
│       ├── main.swift              # Entry point
│       ├── AppDelegate.swift       # Menu bar controller
│       ├── ClickMonitor.swift      # Global click detection
│       ├── OverlayWindow.swift     # Click effect rendering
│       ├── SettingsWindow.swift    # Preferences UI
│       └── Preferences.swift       # UserDefaults wrapper
├── Package.swift                   # Swift package manifest
├── Makefile                        # Build automation
└── docs/                          # Documentation

Core Architecture

1. Click Monitoring (ClickMonitor.swift)

Listens for global mouse events using CGEvent tap:

import Cocoa

class ClickMonitor {
    private var eventTap: CFMachPort?
    weak var delegate: ClickMonitorDelegate?
    
    func start() {
        let eventMask = (1 << CGEventType.leftMouseDown.rawValue) |
                        (1 << CGEventType.leftMouseUp.rawValue) |
                        (1 << CGEventType.rightMouseDown.rawValue) |
                        (1 << CGEventType.rightMouseUp.rawValue) |
                        (1 << CGEventType.leftMouseDragged.rawValue)
        
        guard let eventTap = CGEvent.tapCreate(
            tap: .cgSessionEventTap,
            place: .headInsertEventTap,
            options: .defaultTap,
            eventsOfInterest: CGEventMask(eventMask),
            callback: { (proxy, type, event, refcon) -> Unmanaged<CGEvent>? in
                guard let refcon = refcon else { return Unmanaged.passRetained(event) }
                let monitor = Unsafely<ClickMonitor>.fromPointer(refcon)
                monitor.handleEvent(type: type, event: event)
                return Unmanaged.passRetained(event)
            },
            userInfo: Unafely.toPointer(self)
        ) else {
            print("Failed to create event tap")
            return
        }
        
        let runLoopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0)
        CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, .commonModes)
        CGEvent.tapEnable(tap: eventTap, enable: true)
        
        self.eventTap = eventTap
    }
    
    private func handleEvent(type: CGEventType, event: CGEvent) {
        let location = event.location
        
        switch type {
        case .leftMouseDown:
            delegate?.didDetectClick(at: location, type: .press)
        case .leftMouseUp:
            delegate?.didDetectClick(at: location, type: .release)
        case .rightMouseDown:
            delegate?.didDetectClick(at: location, type: .rightClick)
        case .leftMouseDragged:
            delegate?.didDetectDrag(at: location)
        default:
            break
        }
    }
    
    func stop() {
        if let eventTap = eventTap {
            CGEvent.tapEnable(tap: eventTap, enable: false)
            CFMachPortInvalidate(eventTap)
        }
    }
}

protocol ClickMonitorDelegate: AnyObject {
    func didDetectClick(at location: CGPoint, type: ClickType)
    func didDetectDrag(at location: CGPoint)
}

enum ClickType {
    case press, release, rightClick
}

2. Overlay Rendering (OverlayWindow.swift)

Creates a transparent window overlay for click effects:

import Cocoa

class OverlayWindow: NSWindow {
    init() {
        // Cover all screens
        let screenFrame = NSScreen.screens.reduce(NSRect.zero) { (result, screen) in
            return result.union(screen.frame)
        }
        
        super.init(
            contentRect: screenFrame,
            styleMask: .borderless,
            backing: .buffered,
            defer: false
        )
        
        self.isOpaque = false
        self.backgroundColor = .clear
        self.level = .floating
        self.ignoresMouseEvents = true
        self.collectionBehavior = [.canJoinAllSpaces, .stationary]
        
        let overlayView = OverlayView(frame: screenFrame)
        self.contentView = overlayView
    }
}

class OverlayView: NSView {
    private var clickEffects: [ClickEffect] = []
    
    override func draw(_ dirtyRect: NSRect) {
        guard let context = NSGraphicsContext.current?.cgContext else { return }
        
        for effect in clickEffects {
            effect.draw(in: context)
        }
    }
    
    func addClickEffect(at location: CGPoint, type: ClickType, config: EffectConfig) {
        let effect = ClickEffect(
            location: location,
            type: type,
            size: config.size,
            duration: config.duration,
            intensity: config.intensity,
            color: config.color
        )
        
        clickEffects.append(effect)
        
        // Animate effect
        effect.animate { [weak self] in
            self?.clickEffects.removeAll { $0 === effect }
            self?.needsDisplay = true
        }
        
        self.needsDisplay = true
    }
}

struct EffectConfig {
    let size: CGFloat
    let duration: TimeInterval
    let intensity: CGFloat
    let color: NSColor
}

class ClickEffect {
    let location: CGPoint
    let type: ClickType
    var currentRadius: CGFloat
    var currentAlpha: CGFloat = 1.0
    
    private let maxRadius: CGFloat
    private let duration: TimeInterval
    private let color: NSColor
    
    init(location: CGPoint, type: ClickType, size: CGFloat, duration: TimeInterval, intensity: CGFloat, color: NSColor) {
        self.location = location
        self.type = type
        self.maxRadius = size
        self.duration = duration
        self.color = color.withAlphaComponent(intensity)
        self.currentRadius = size * 0.5
    }
    
    func draw(in context: CGContext) {
        context.setStrokeColor(color.cgColor)
        context.setLineWidth(3.0)
        context.setAlpha(currentAlpha)
        
        let rect = CGRect(
            x: location.x - currentRadius,
            y: location.y - currentRadius,
            width: currentRadius * 2,
            height: currentRadius * 2
        )
        
        context.strokeEllipse(in: rect)
    }
    
    func animate(completion: @escaping () -> Void) {
        let startTime = Date()
        
        Timer.scheduledTimer(withTimeInterval: 1/60.0, repeats: true) { [weak self] timer in
            guard let self = self else {
                timer.invalidate()
                return
            }
            
            let elapsed = Date().timeIntervalSince(startTime)
            let progress = min(elapsed / self.duration, 1.0)
            
            if progress >= 1.0 {
                timer.invalidate()
                completion()
                return
            }
            
            // Expand and fade
            self.currentRadius = self.maxRadius * (0.5 + progress * 0.5)
            self.currentAlpha = 1.0 - progress
        }
    }
}

3. Preferences Management (Preferences.swift)

import Foundation
import Cocoa

class Preferences {
    static let shared = Preferences()
    
    private let defaults = UserDefaults.standard
    
    enum Key: String {
        case clickSize = "clickSize"
        case clickDuration = "clickDuration"
        case clickIntensity = "clickIntensity"
        case clickColor = "clickColor"
        case laserPointerEnabled = "laserPointerEnabled"
        case compactIcon = "compactIcon"
    }
    
    var clickSize: CGFloat {
        get { CGFloat(defaults.double(forKey: Key.clickSize.rawValue)) }
        set { defaults.set(Double(newValue), forKey: Key.clickSize.rawValue) }
    }
    
    var clickDuration: TimeInterval {
        get { defaults.double(forKey: Key.clickDuration.rawValue) }
        set { defaults.set(newValue, forKey: Key.clickDuration.rawValue) }
    }
    
    var clickIntensity: CGFloat {
        get { CGFloat(defaults.double(forKey: Key.clickIntensity.rawValue)) }
        set { defaults.set(Double(newValue), forKey: Key.clickIntensity.rawValue) }
    }
    
    var clickColor: NSColor {
        get {
            guard let data = defaults.data(forKey: Key.clickColor.rawValue),
                  let color = try? NSKeyedUnarchiver.unarchivedObject(ofClass: NSColor.self, from: data) else {
                return .systemBlue
            }
            return color
        }
        set {
            if let data = try? NSKeyedArchiver.archivedData(withRootObject: newValue, requiringSecureCoding: false) {
                defaults.set(data, forKey: Key.clickColor.rawValue)
            }
        }
    }
    
    var laserPointerEnabled: Bool {
        get { defaults.bool(forKey: Key.laserPointerEnabled.rawValue) }
        set { defaults.set(newValue, forKey: Key.laserPointerEnabled.rawValue) }
    }
    
    func registerDefaults() {
        defaults.register(defaults: [
            Key.clickSize.rawValue: 50.0,
            Key.clickDuration.rawValue: 0.5,
            Key.clickIntensity.rawValue: 0.7,
            Key.laserPointerEnabled.rawValue: false,
            Key.compactIcon.rawValue: false
        ])
    }
}

4. Menu Bar Integration (AppDelegate.swift)

import Cocoa

@main
class AppDelegate: NSObject, NSApplicationDelegate {
    private var statusItem: NSStatusItem!
    private var clickMonitor: ClickMonitor!
    private var overlayWindow: OverlayWindow!
    private var settingsWindow: SettingsWindow?
    
    func applicationDidFinishLaunching(_ notification: Notification) {
        Preferences.shared.registerDefaults()
        
        // Create menu bar item
        statusItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)
        statusItem.button?.image = NSImage(systemSymbolName: "circle.circle", accessibilityDescription: "ClickLight")
        statusItem.menu = createMenu()
        
        // Initialize overlay
        overlayWindow = OverlayWindow()
        overlayWindow.orderFront(nil)
        
        // Start monitoring
        clickMonitor = ClickMonitor()
        clickMonitor.delegate = self
        clickMonitor.start()
    }
    
    private func createMenu() -> NSMenu {
        let menu = NSMenu()
        
        menu.addItem(NSMenuItem(title: "Settings...", action: #selector(openSettings), keyEquivalent: ","))
        menu.addItem(NSMenuItem.separator())
        
        // Quick presets
        let sizeMenu = NSMenu()
        sizeMenu.addItem(createPresetItem(title: "Small", size: 30))
        sizeMenu.addItem(createPresetItem(title: "Medium", size: 50))
        sizeMenu.addItem(createPresetItem(title: "Large", size: 80))
        
        let sizeItem = NSMenuItem(title: "Size", action: nil, keyEquivalent: "")
        sizeItem.submenu = sizeMenu
        menu.addItem(sizeItem)
        
        menu.addItem(NSMenuItem.separator())
        menu.addItem(NSMenuItem(title: "Test Pulse", action: #selector(testPulse), keyEquivalent: "t"))
        menu.addItem(NSMenuItem.separator())
        menu.addItem(NSMenuItem(title: "Quit ClickLight", action: #selector(quit), keyEquivalent: "q"))
        
        return menu
    }
    
    @objc private func openSettings() {
        if settingsWindow == nil {
            settingsWindow = SettingsWindow()
        }
        settingsWindow?.showWindow(nil)
        NSApp.activate(ignoringOtherApps: true)
    }
    
    @objc private func testPulse() {
        guard let screen = NSScreen.main else { return }
        let center = CGPoint(x: screen.frame.midX, y: screen.frame.midY)
        
        let config = EffectConfig(
            size: Preferences.shared.clickSize,
            duration: Preferences.shared.clickDuration,
            intensity: Preferences.shared.clickIntensity,
            color: Preferences.shared.clickColor
        )
        
        (overlayWindow.contentView as? OverlayView)?.addClickEffect(at: center, type: .press, config: config)
    }
    
    @objc private func quit() {
        NSApplication.shared.terminate(nil)
    }
    
    private func createPresetItem(title: String, size: CGFloat) -> NSMenuItem {
        let item = NSMenuItem(title: title, action: #selector(applyPreset(_:)), keyEquivalent: "")
        item.representedObject = size
        return item
    }
    
    @objc private func applyPreset(_ sender: NSMenuItem) {
        if let size = sender.representedObject as? CGFloat {
            Preferences.shared.clickSize = size
        }
    }
}

extension AppDelegate: ClickMonitorDelegate {
    func didDetectClick(at location: CGPoint, type: ClickType) {
        let config = EffectConfig(
            size: Preferences.shared.clickSize,
            duration: Preferences.shared.clickDuration,
            intensity: Preferences.shared.clickIntensity,
            color: Preferences.shared.clickColor
        )
        
        (overlayWindow.contentView as? OverlayView)?.addClickEffect(at: location, type: type, config: config)
    }
    
    func didDetectDrag(at location: CGPoint) {
        guard Preferences.shared.laserPointerEnabled else { return }
        // Implement laser pointer trail logic
    }
}

Configuration

Programmatic Configuration

Modify preferences directly:

// Adjust click size
Preferences.shared.clickSize = 60.0

// Change duration (seconds)
Preferences.shared.clickDuration = 0.8

// Set intensity (0.0 to 1.0)
Preferences.shared.clickIntensity = 0.9

// Custom color
Preferences.shared.clickColor = NSColor(red: 1.0, green: 0.3, blue: 0.3, alpha: 1.0)

// Enable laser pointer mode
Preferences.shared.laserPointerEnabled = true

UserDefaults Keys

Access preferences via command line:

# View all ClickLight preferences
defaults read com.yourname.ClickLight

# Set click size
defaults write com.yourname.ClickLight clickSize -float 70

# Set duration
defaults write com.yourname.ClickLight clickDuration -float 0.6

# Reset to defaults
defaults delete com.yourname.ClickLight

Common Patterns

Custom Click Effect Style

// Create custom effect renderer
class CustomClickEffect: ClickEffect {
    override func draw(in context: CGContext) {
        // Draw square instead of circle
        let rect = CGRect(
            x: location.x - currentRadius,
            y: location.y - currentRadius,
            width: currentRadius * 2,
            height: currentRadius * 2
        )
        
        context.setStrokeColor(color.cgColor)
        context.setLineWidth(4.0)
        context.setAlpha(currentAlpha)
        context.stroke(rect)
    }
}

Multi-Screen Support

// Handle multiple displays
extension OverlayWindow {
    func updateForScreenConfiguration() {
        let unionFrame = NSScreen.screens.reduce(NSRect.zero) { $0.union($1.frame) }
        self.setFrame(unionFrame, display: true)
        self.contentView?.frame = unionFrame
    }
}

// Listen for screen changes
NotificationCenter.default.addObserver(
    forName: NSApplication.didChangeScreenParametersNotification,
    object: nil,
    queue: .main
) { [weak self] _ in
    self?.overlayWindow.updateForScreenConfiguration()
}

Keyboard Shortcut Integration

// Add global hotkey support
import Carbon

class HotkeyManager {
    private var eventHandler: EventHandlerRef?
    
    func registerHotkey(key: UInt32, modifiers: UInt32, action: @escaping () -> Void) {
        var hotKeyID = EventHotKeyID(signature: 0x4343, id: 1)
        var hotKeyRef: EventHotKeyRef?
        
        RegisterEventHotKey(
            key,
            modifiers,
            hotKeyID,
            GetApplicationEventTarget(),
            0,
            &hotKeyRef
        )
        
        // Store action callback
    }
}

// Usage: Toggle ClickLight with Cmd+Shift+C
let hotkeyManager = HotkeyManager()
hotkeyManager.registerHotkey(key: 8, modifiers: cmdKey | shiftKey) {
    // Toggle click monitoring
}

Development Workflow

Build Commands

# Build debug version
swift build

# Build release version
swift build -c release

# Run directly
swift run

# Clean build artifacts
swift package clean

# Run tests
swift test

Makefile Shortcuts

# Build and run
make run

# Build release
make build

# Install to /Applications
make install

# Clean build directory
make clean

# Create distribution archive
make archive

Debugging

Enable verbose logging:

// Add to main.swift
#if DEBUG
let logger = Logger(subsystem: "com.yourname.ClickLight", category: "debug")
logger.debug("Click detected at \(location)")
#endif

Monitor click events:

# Watch event tap status
log stream --predicate 'subsystem == "com.yourname.ClickLight"' --level debug

Troubleshooting

Clicks Not Detected

1. Check Accessibility permission:

   # List apps with Accessibility access
   sqlite3 "/Library/Application Support/com.apple.TCC/TCC.db" \
     "SELECT client FROM access WHERE service='kTCCServiceAccessibility'"
   

2. Verify event tap is active:

   // Add diagnostic logging
   if eventTap == nil {
       print("ERROR: Event tap failed to create")
       print("Check Accessibility permission in System Settings")
   }
   

3. Restart after permission grant: Must quit and relaunch for permission to take effect.

Overlay Not Visible

1. Check window level:

   overlayWindow.level = .floating  // Should be above normal windows
   

2. Verify transparency:

   print("Overlay opaque: \(overlayWindow.isOpaque)")  // Should be false
   print("Background: \(overlayWindow.backgroundColor)")  // Should be clear
   

3. Test with simple shape:

   // Draw test rectangle to verify overlay is rendering
   context.setFillColor(NSColor.red.cgColor)
   context.fill(CGRect(x: 100, y: 100, width: 100, height: 100))
   

Performance Issues

1. Limit active effects:

   // Remove old effects after max count
   if clickEffects.count > 10 {
       clickEffects.removeFirst(clickEffects.count - 10)
   }
   

2. Optimize drawing:

   // Only redraw dirty regions
   override func draw(_ dirtyRect: NSRect) {
       let visibleEffects = clickEffects.filter { effect in
           dirtyRect.intersects(effect.boundingRect)
       }
       for effect in visibleEffects {
           effect.draw(in: context)
       }
   }
   

3. Reduce animation frequency:

   // Lower frame rate for animations
   Timer.scheduledTimer(withTimeInterval: 1/30.0, repeats: true) { ... }
   

Build Errors

# Update Swift tools version
swift package tools-version --set-current

# Resolve dependencies
swift package resolve

# Update Package.resolved
swift package update

# Clean and rebuild
rm -rf .build && swift build

Code Signing Issues

# Sign for local development
codesign --force --deep --sign - ClickLight.app

# Verify signature
codesign --verify --verbose ClickLight.app

# Check entitlements
codesign -d --entitlements - ClickLight.app

Testing

Manual Testing Checklist

• Click detection works across all applications
• Right-click shows different effect
• Drag events trigger laser pointer (if enabled)
• Settings changes apply immediately
• Menu bar icon updates correctly
• Test pulse fires from center screen
• Effects scale properly on Retina displays
• Multi-monitor support works
• Preferences persist after quit/relaunch

Automated Testing

// Tests/ClickLightTests/PreferencesTests.swift
import XCTest
@testable import ClickLight

final class PreferencesTests: XCTestCase {
    func testDefaultValues() {
        let prefs = Preferences.shared
        XCTAssertEqual(prefs.clickSize, 50.0)
        XCTAssertEqual(prefs.clickDuration, 0.5)
        XCTAssertEqual(prefs.clickIntensity, 0.7)
    }
    
    func testColorPersistence() {
        let prefs = Preferences.shared
        let testColor = NSColor.red
        
        prefs.clickColor = testColor
        let retrieved = prefs.clickColor
        
        XCTAssertEqual(retrieved, testColor)
    }
}

Run tests:

swift test

Integration Examples

Use with OBS Studio

ClickLight overlays work with OBS window/display capture:

1. Launch ClickLight
2. In OBS, add Display Capture source
3. ClickLight effects will appear in recording

Use with Screen Studio

ClickLight provides live effects; Screen Studio can add post-production effects:

• ClickLight: Real-time visibility during recording
• Screen Studio: Enhanced post-production effects

Both can work together for maximum visibility.

Use with QuickTime Screen Recording

# Record screen with ClickLight active
# Effects will be captured in the recording

Advanced Customization

Add Custom Preset

// Create preset configuration
struct Preset {
    let name: String
    let size: CGFloat
    let duration: TimeInterval
    let intensity: CGFloat
    let color: NSColor
}

let presets = [
    Preset(name: "Subtle", size: 30, duration: 0.3, intensity: 0.5, color: .systemGray),
    Preset(name: "Bold", size: 80, duration: 0.8, intensity: 1.0, color: .systemRed),
    Preset(name: "Presentation", size: 60, duration: 0.6, intensity: 0.8, color: .systemBlue)
]

// Apply preset
func applyPreset(_ preset: Preset) {
    Preferences.shared.clickSize = preset.size
    Preferences.shared.clickDuration = preset.duration
    Preferences.shared.clickIntensity = preset.intensity
    Preferences.shared.clickColor = preset.color
}

Add Sound Effects

import AVFoundation

class SoundPlayer {
    private var audioPlayer: AVAudioPlayer?
    
    func playClickSound() {
        guard let soundURL = Bundle.main.url(forResource: "click", withExtension: "wav") else { return }
        
        do {
            audioPlayer = try AVAudioPlayer(contentsOf: soundURL)
            audioPlayer?.volume = 0.3
            audioPlayer?.play()
        } catch {
            print("Failed to play sound: \(error)")
        }
    }
}

// Integrate into click detection
extension AppDelegate {
    func didDetectClick(at location: CGPoint, type: ClickType) {
        // Existing visual effect code...
        soundPlayer.playClickSound()
    }
}

Export Settings

// Export preferences to JSON
extension Preferences {
    func exportSettings() -> String? {
        let settings: [String: Any] = [
            "clickSize": clickSize,
            "clickDuration": clickDuration,
            "clickIntensity": clickIntensity,
            "laserPointerEnabled": laserPointerEnabled
        ]
        
        guard let data = try? JSONSerialization.data(withJSONObject: settings, options: .prettyPrinted),
              let json = String(data: data, encoding: .utf8) else {
            return nil
        }
        
        return json
    }
    
    func importSettings(json: String) {
        guard let data = json.data(using: .utf8),
              let settings = try? JSONSerialization.jsonObject(with: data) as? [String: Any] else {
            return
        }
        
        if let size = settings["clickSize"] as? Double {
            clickSize = CGFloat(size)
        }
        if let duration = settings["clickDuration"] as? Double {
            clickDuration = duration
        }
        // ... import other settings
    }
}

Resources

• Repository: https://github.com/aurorascharff/ClickLight
• Releases: https://github.com/aurorascharff/ClickLight/releases
• Issues: https://github.com/aurorascharff/ClickLight/issues
• License: MIT
• Swift Documentation: https://www.swift.org/documentation/
• AppKit Reference: https://developer.apple.com/documentation/appkit