Daemon-Devarshi · October 6, 2023 14:15 · Daemon-Devarshi · Apr 25, 2021
diff --git a/PasteboardWatcher.swift b/PasteboardWatcher.swift
 //
 //  PasteboardWatcher.swift
 //  PasteboardWatcher
 //
 //  Created by Devarshi Kulshreshtha on 6/19/15.PasteboardWatcher
 //  Copyright © 2015 Devarshi Kulshreshtha. All rights reserved.
 //

 import Cocoa

 /// Protocol defining the methods which delegate has/ can implement
 protocol PasteboardWatcherDelegate {
    
    /// the method which is invoked on delegate when a new url of desired kind is copied
    /// - Parameter copiedUrl: the newly copied url of desired kind
    func newlyCopiedUrlObtained(copiedUrl copiedUrl : NSURL)
 }

 /// Use this class to notify a delegate once a url with specified kind is copied
 /// - Credit goes to: **Josh Goebel**
 /// - His wonderful pastie: [PasteboardWatcher in objective-c](http://pastie.org/1129293)
 class PasteboardWatcher : NSObject {
    
    // assigning a pasteboard object
    private let pasteboard = NSPasteboard.generalPasteboard()
    
    // to keep track of count of objects currently copied
    // also helps in determining if a new object is copied
    private var changeCount : Int
    
    // used to perform polling to identify if url with desired kind is copied
    private var timer: NSTimer?
    
    // the delegate which will be notified when desired link is copied
    var delegate: PasteboardWatcherDelegate?
    
    // the kinds of files for which if url is copied the delegate is notified
    private let fileKinds : [String]
    
    /// initializer which should be used to initialize object of this class
    /// - Parameter fileKinds: an array containing the desired file kinds
    init(fileKinds: [String]) {
        // assigning current pasteboard changeCount so that it can be compared later to identify changes
        changeCount = pasteboard.changeCount
        
        // assigning passed desired file kinds to respective instance variable
        self.fileKinds = fileKinds
        
        super.init()
    }
    /// starts polling to identify if url with desired kind is copied
    /// - Note: uses an NSTimer for polling
    func startPolling () {
        // setup and start of timer
        timer = NSTimer.scheduledTimerWithTimeInterval(2, target: self, selector: Selector("checkForChangesInPasteboard"), userInfo: nil, repeats: true)
    }
    
    /// method invoked continuously by timer
    /// - Note: To keep this method as private I referred this answer at stackoverflow - [Swift - NSTimer does not invoke a private func as selector](http://stackoverflow.com/a/30947182/217586)
    @objc private func checkForChangesInPasteboard() {
        // check if there is any new item copied
        // also check if kind of copied item is string
        if let copiedString = pasteboard.stringForType(NSPasteboardTypeString) where pasteboard.changeCount != changeCount {
            
            // obtain url from copied link if its path extension is one of the desired extensions
            if let fileUrl = NSURL(string: copiedString) where self.fileKinds.contains(fileUrl.pathExtension!){
                
                // invoke appropriate method on delegate
                self.delegate?.newlyCopiedUrlObtained(copiedUrl: fileUrl)
            }
            
            // assign new change count to instance variable for later comparison
            changeCount = pasteboard.changeCount
        }
    }
 }
	//
	// PasteboardWatcher.swift
	// PasteboardWatcher
	//
	// Created by Devarshi Kulshreshtha on 6/19/15.PasteboardWatcher
	// Copyright © 2015 Devarshi Kulshreshtha. All rights reserved.
	//

	import Cocoa

	/// Protocol defining the methods which delegate has/ can implement
	protocol PasteboardWatcherDelegate {

	/// the method which is invoked on delegate when a new url of desired kind is copied
	/// - Parameter copiedUrl: the newly copied url of desired kind
	func newlyCopiedUrlObtained(copiedUrl copiedUrl : NSURL)
	}

	/// Use this class to notify a delegate once a url with specified kind is copied
	/// - Credit goes to: Josh Goebel
	/// - His wonderful pastie: [PasteboardWatcher in objective-c](http://pastie.org/1129293)
	class PasteboardWatcher : NSObject {

	// assigning a pasteboard object
	private let pasteboard = NSPasteboard.generalPasteboard()

	// to keep track of count of objects currently copied
	// also helps in determining if a new object is copied
	private var changeCount : Int

	// used to perform polling to identify if url with desired kind is copied
	private var timer: NSTimer?

	// the delegate which will be notified when desired link is copied
	var delegate: PasteboardWatcherDelegate?

	// the kinds of files for which if url is copied the delegate is notified
	private let fileKinds : [String]

	/// initializer which should be used to initialize object of this class
	/// - Parameter fileKinds: an array containing the desired file kinds
	init(fileKinds: [String]) {
	// assigning current pasteboard changeCount so that it can be compared later to identify changes
	changeCount = pasteboard.changeCount

	// assigning passed desired file kinds to respective instance variable
	self.fileKinds = fileKinds

	super.init()
	}
	/// starts polling to identify if url with desired kind is copied
	/// - Note: uses an NSTimer for polling
	func startPolling () {
	// setup and start of timer
	timer = NSTimer.scheduledTimerWithTimeInterval(2, target: self, selector: Selector("checkForChangesInPasteboard"), userInfo: nil, repeats: true)
	}

	/// method invoked continuously by timer
	/// - Note: To keep this method as private I referred this answer at stackoverflow - [Swift - NSTimer does not invoke a private func as selector](http://stackoverflow.com/a/30947182/217586)
	@objc private func checkForChangesInPasteboard() {
	// check if there is any new item copied
	// also check if kind of copied item is string
	if let copiedString = pasteboard.stringForType(NSPasteboardTypeString) where pasteboard.changeCount != changeCount {

	// obtain url from copied link if its path extension is one of the desired extensions
	if let fileUrl = NSURL(string: copiedString) where self.fileKinds.contains(fileUrl.pathExtension!){

	// invoke appropriate method on delegate
	self.delegate?.newlyCopiedUrlObtained(copiedUrl: fileUrl)
	}

	// assign new change count to instance variable for later comparison
	changeCount = pasteboard.changeCount
	}
	}
	}