//
//  KMHoverView.swift
//  PDF Reader Pro
//
//  Created by tangchao on 2023/6/7.
//

import Cocoa

enum KMHoverAction: Int {
    case enter      = 1
    case move       = 2
    case exit       = 3
}

// hover 基类
class KMHoverView: NSView {
    private var _area: NSTrackingArea?
    var hoverAction: ((KMHoverView, KMHoverAction)->Void)?
    
    deinit {
        if let area_ = self._area {
            self.removeTrackingArea(area_)
        }
    }
    
    override func updateTrackingAreas() {
        super.updateTrackingAreas()
        
        if let area_ = self._area {
            self.removeTrackingArea(area_)
            self._area = nil
        }
        
        self._area = NSTrackingArea(rect: self.bounds, options: [.mouseEnteredAndExited, .mouseMoved, .activeAlways], owner: self)
        if let area_ = self._area {
            self.addTrackingArea(area_)
        }
    }
    
    override func mouseEntered(with event: NSEvent) {
        guard let callback = self.hoverAction else {
            return
        }
        callback(self, .enter)
    }
    
    override func mouseExited(with event: NSEvent) {
        guard let callback = self.hoverAction else {
            return
        }
        callback(self, .exit)
    }
    
    override func mouseMoved(with event: NSEvent) {
        guard let callback = self.hoverAction else {
            return
        }
        callback(self, .move)
    }
}