macos-stats/Stats/Widgets/BatteryView.swift

//
//  BatteryView.swift
//  Stats
//
//  Created by Serhiy Mytrovtsiy on 14/06/2019.
//  Copyright © 2019 Serhiy Mytrovtsiy. All rights reserved.
//

import Cocoa

class BatteryView: NSView, Widget {
    var value: Float {
        didSet {
            self.redraw()
        }
    }
    var charging: Bool {
        didSet {
            self.redraw()
        }
    }
    
    override init(frame: NSRect) {
        self.value = 1.0
        self.charging = false
        super.init(frame: frame)
        self.wantsLayer = true
        self.addSubview(NSView())
    }
    
    required init?(coder decoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)
        
        let x: CGFloat = 4.0
        let w: CGFloat = dirtyRect.size.width - (x * 2)
        let h: CGFloat = 11.0
        let y: CGFloat = (dirtyRect.size.height - h) / 2
        let r: CGFloat = 1.0
        
        let battery = NSBezierPath(roundedRect: NSRect(x: x-1, y: y, width: w-1, height: h), xRadius: r, yRadius: r)
        
        let bPX: CGFloat = x+w-2
        let bPY: CGFloat = (dirtyRect.size.height / 2) - 2
        let batteryPoint = NSBezierPath(roundedRect: NSRect(x: bPX, y: bPY, width: 2, height: 4), xRadius: r, yRadius: r)
        if self.charging {
            NSColor.systemGreen.set()
        } else {
            NSColor.labelColor.set()
        }
        batteryPoint.lineWidth = 1.1
        batteryPoint.stroke()
        batteryPoint.fill()
        
        let maxWidth = w-4.25
        let inner = NSBezierPath(roundedRect: NSRect(x: x+0.75, y: y+1.5, width: maxWidth*CGFloat(self.value), height: h-3), xRadius: 0.5, yRadius: 0.5)
        self.value.batteryColor().set()
        inner.lineWidth = 0
        inner.stroke()
        inner.close()
        inner.fill()
        
        if self.charging {
            NSColor.systemGreen.set()
        } else {
            NSColor.labelColor.set()
        }
        battery.lineWidth = 0.8
        battery.stroke()
    }
    
    func redraw() {
        self.needsDisplay = true
        setNeedsDisplay(self.frame)
    }
    
    func value(value: Float) {
        if self.value != value {
            self.value = value
        }
    }
    
    func setCharging(value: Bool) {
        if self.charging != value {
            self.charging = value
        }
    }
}