EmptyCollectionProvider.swift

//
//  BaseCollectionProvider.swift
//  CollectionKit
//
//  Created by Luke Zhao on 2017-08-15.
//  Copyright © 2017 lkzhao. All rights reserved.
//

import UIKit

open class EmptyCollectionProvider: ItemProvider, CollectionReloadable {
  open var identifier: String?

  public init(identifier: String? = nil) {
    self.identifier = identifier
  }

  open var numberOfItems: Int {
    return 0
  }
  open func view(at: Int) -> UIView {
    return UIView()
  }
  open func update(view: UIView, at: Int) {}
  open func identifier(at: Int) -> String {
    return "\(at)"
  }

  open var contentSize: CGSize {
    return .zero
  }
  open func layout(collectionSize: CGSize) {}
  open func frame(at: Int) -> CGRect {
    return .zero
  }
  open func visible(in visibleFrame: CGRect) -> (indexes: [Int], frame: CGRect) {
    return ([Int](), visibleFrame)
  }

  open func animator(at: Int) -> Animator? {
    return nil
  }

  open func willReload() {}
  open func didReload() {}
  open func didTap(view: UIView, at: Int) {}

  open func hasReloadable(_ reloadable: CollectionReloadable) -> Bool {
    return reloadable === self
  }
}