//
//  KMToolSetScroller.swift
//  PDF Reader Pro
//
//  Created by wanjun on 2022/10/27.
//

import Cocoa

class KMToolSetScroller: NSScroller {
    var newScroolValue: Float = 0
    override var floatValue: Float {
        didSet {
            animator().alphaValue = 1.0
            NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(fadeOut), object: nil)
            perform(#selector(fadeOut), with: nil, afterDelay: 1.5)
        }
    }

    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)

        self.drawKnob()
    }
    
    override func drawKnobSlot(in slotRect: NSRect, highlight flag: Bool) {
        
    }
    
    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        commonInitializer()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        commonInitializer()
    }
    
    override func awakeFromNib() {
        super.awakeFromNib()
        commonInitializer()
    }
    
    // MARK:
    
    func commonInitializer() {
        let trackingArea: NSTrackingArea = NSTrackingArea(
            rect: self.bounds,
            options: [.mouseEnteredAndExited, .activeInActiveApp, .mouseMoved],
            owner: self,
            userInfo: nil
        )
        addTrackingArea(trackingArea)
    }
    
    @objc func fadeOut() {
        NSAnimationContext.runAnimationGroup({ (context) in
            context.duration = 0.3
            animator().alphaValue = 0.0
        }, completionHandler: nil)
    }
    
    override func mouseExited(with event: NSEvent) {
        super.mouseExited(with: event)
        fadeOut()
    }
    
    override func mouseEntered(with event: NSEvent) {
        super.mouseEntered(with: event)
        NSAnimationContext.runAnimationGroup({ (context) in
            context.duration = 0.1
            animator().alphaValue = 1.0
        }, completionHandler: nil)
        NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(fadeOut), object: nil)
    }
    
    override func mouseMoved(with event: NSEvent) {
        super.mouseMoved(with: event)
        alphaValue = 1.0
    }
    
    override class var isCompatibleWithOverlayScrollers: Bool {
        return self == KMToolSetScroller.self
    }
}