//
//  KMNCollectionView.swift
//  PDF Reader Pro
//
//  Created by 丁林圭 on 2024/10/27.
//

import Cocoa

class KMNThumbnailCollectionView: NSCollectionView {
    var menuClickedAction: ((_ clickPoint: NSPoint) -> NSMenu)?
    
    var collectionSelectChanges: (() -> Void)?

    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)
        
        // Drawing code here.
    }
    
    override func menu(for event: NSEvent) -> NSMenu? {
        let point = event.locationInWindow
        let rightIndex = indexPathForItem(at: convert(point, from: nil))
        if rightIndex != nil {
            let cellView = item(at: rightIndex!) as? KMNThumbnailCollectionViewItem
            if(cellView != nil) {
                if(cellView?.isSelected == true) {
                    
                } else {
                    self.selectionIndexPaths = NSMutableSet() as! Set<IndexPath>
                    var indexPaths: Set<IndexPath> = []
                    indexPaths.insert(rightIndex!)
                    self.selectionIndexPaths = indexPaths
                }
            } else {
                self.selectionIndexPaths = NSMutableSet() as! Set<IndexPath>
            }
        } else {
            self.selectionIndexPaths = NSMutableSet() as! Set<IndexPath>
        }
        
        if menuClickedAction != nil {
            let menu = menuClickedAction!(point)
            return menu
        }
        
        return super.menu(for: event)
    }
    
    override var selectionIndexPaths: Set<IndexPath> {
        didSet {
            collectionSelectChanges?()
        }
    }
    
}