//
//  HistoryMarkTransformer.swift
//  KCD
//
//  Created by Hori,Masaki on 2017/01/05.
//  Copyright © 2017年 Hori,Masaki. All rights reserved.
//

import Cocoa

final class HistoryMarkTransformer: ValueTransformer {
    
    override class func transformedValueClass() -> AnyClass {
        
        return NSColor.self
    }
    
    override func transformedValue(_ value: Any?) -> Any? {
        
        guard let v = value as? Bool else {
            
            return nil
        }
        
        return v ? HistoryMarkTransformer.markImage : nil
    }
    
    static var markImage: NSImage = {
        
        let radius: CGFloat = 10.0
        let image = NSImage(size: NSSize(width: radius, height: radius))
        
        do {
            
            image.lockFocus()
            defer { image.unlockFocus() }
            
            NSColor.red.highlight(withLevel: 0.6)?.set()
            NSBezierPath(roundedRect: NSRect(x: 0, y: 0, width: radius, height: radius),
                         xRadius: radius / 2,
                         yRadius: radius / 2)
                .fill()
        }
        
        return image
    }()
}