//
//  OXGradientView.swift
//  OXKit
//
//  The MIT License (MIT)
//
//  Copyright (c) 2016 Dmitriy Azarov. All rights reserved.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//  SOFTWARE.

import Foundation
import UIKit

@IBDesignable
open class OXGradientView: UIView {
    @IBInspectable
    open var topColor: UIColor? = UIColor.clear
    
    @IBInspectable
    open var bottomColor: UIColor? = UIColor.clear
    
    fileprivate let gradientLayer = CAGradientLayer()
    
    fileprivate func updateGradient() {
        if gradientLayer.superlayer == nil { layer.addSublayer(gradientLayer)}
        
        if let top = topColor, let bottom = bottomColor {
            gradientLayer.colors = [top.cgColor, bottom.cgColor]
            gradientLayer.locations = [0.0, 1.0]
        }
    }
    
    open override func layoutSubviews() {
        gradientLayer.frame = layer.frame
        updateGradient()
        
        super.layoutSubviews()
    }
}
