Attractor/App/Titlebar and URL Bar/TitlebarView.swift

//
//  TitlebarView.swift
//  SBrowser
//
//  Created by James Magahern on 7/29/20.
//

import UIKit
import QuartzCore_Private

class TitlebarView: UIView
{
    private let titleLabelView = UILabel(frame: .zero)
    private let backgroundView = GradientView(direction: .horizontal, colors: [
        UIColor(red: 0.101, green: 0.176, blue: 0.415, alpha: 1.0),
        UIColor(red: 0.153, green: 0.000, blue: 0.153, alpha: 1.0)
    ])
    
    private let separatorView = UIView(frame: .zero)
    
    convenience init() {
        self.init(frame: .zero)
        addSubview(backgroundView)
        addSubview(titleLabelView)
        addSubview(separatorView)
        
        separatorView.backgroundColor = UIColor(white: 1.0, alpha: 0.20)
        separatorView.layer.compositingFilter = kCAFilterPlusL
        
        titleLabelView.textColor = .white
        titleLabelView.layer.shadowColor = UIColor.black.cgColor
        titleLabelView.layer.shadowRadius = 0.0
        titleLabelView.layer.shadowOffset = CGSize(width: 0.0, height: 2.0)
        titleLabelView.font = UIFont.boldSystemFont(ofSize: 12.0)
        
        backgroundView.alpha = 0.98
    }
    
    func setTitle(_ title: String) {
        let titleAttributes: [NSAttributedString.Key : Any] = [
            .font : UIFont.boldSystemFont(ofSize: 12.0),
            .foregroundColor : UIColor.white
        ]
        
        let appName = Bundle.main.object(forInfoDictionaryKey: "CFBundleDisplayName") as! String
        let appNameAttributes: [NSAttributedString.Key : Any] = [
            .font : UIFont.systemFont(ofSize: 12.0),
            .foregroundColor : UIColor(white: 1.0, alpha: 0.75)
        ]
        
        if title.count > 0 {
            let attributedString = NSMutableAttributedString(string: title, attributes: titleAttributes)
            let appAttributedString = NSAttributedString(string: " :: \(appName)", attributes: appNameAttributes)
            attributedString.append(appAttributedString)
            
            titleLabelView.attributedText = attributedString
        } else {
            titleLabelView.attributedText = NSAttributedString(string: appName, attributes: titleAttributes)
        }
    }
    
    func setColorTheme(_ colorTheme: [UIColor]) {
        backgroundView.colors = colorTheme
    }
        
    override func layoutSubviews() {
        super.layoutSubviews()
        
        backgroundView.frame = bounds
        titleLabelView.frame = bounds.avoiding(verticalInsets: safeAreaInsets).insetBy(dx: 8.0 + layoutMargins.left, dy: 0.0)
        
        let separatorHeight = 1.0 / UIScreen.main.scale
        separatorView.frame = CGRect(x: 0, y: bounds.height - separatorHeight, width: bounds.width, height: separatorHeight)
    }
}