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//
// NCEmptyDataSet.swift
// Nextcloud
//
// Created by Marino Faggiana on 19/10/2020.
// Copyright © 2020 Marino Faggiana. All rights reserved.
//
// Author Marino Faggiana <marino.faggiana@nextcloud.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
import UIKit
public protocol NCEmptyDataSetDelegate: AnyObject {
func emptyDataSetView(_ view: NCEmptyView)
}
// optional func
public extension NCEmptyDataSetDelegate {
func emptyDataSetView(_ view: NCEmptyView) {}
}
class NCEmptyDataSet: NSObject {
private var emptyView: NCEmptyView?
private var timer: Timer?
private var numberItemsForSections: Int = 0
private weak var delegate: NCEmptyDataSetDelegate?
private var fillBackgroundName: String = ""
private var fillBackgroundView = UIImageView()
private var centerXAnchor: NSLayoutConstraint?
private var centerYAnchor: NSLayoutConstraint?
init(view: UIView, offset: CGFloat = 0, delegate: NCEmptyDataSetDelegate?) {
super.init()
if let emptyView = UINib(nibName: "NCEmptyView", bundle: nil).instantiate(withOwner: self, options: nil).first as? NCEmptyView {
self.delegate = delegate
self.emptyView = emptyView
emptyView.isHidden = true
emptyView.translatesAutoresizingMaskIntoConstraints = false
// emptyView.backgroundColor = .red
// emptyView.isHidden = false
emptyView.emptyTitle.sizeToFit()
emptyView.emptyDescription.sizeToFit()
view.addSubview(emptyView)
emptyView.widthAnchor.constraint(equalToConstant: 350).isActive = true
emptyView.heightAnchor.constraint(equalToConstant: 250).isActive = true
if let view = view.superview {
centerXAnchor = emptyView.centerXAnchor.constraint(equalTo: view.centerXAnchor)
centerYAnchor = emptyView.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: offset)
} else {
centerXAnchor = emptyView.centerXAnchor.constraint(equalTo: view.centerXAnchor)
centerYAnchor = emptyView.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: offset)
}
centerXAnchor?.isActive = true
centerYAnchor?.isActive = true
}
}
func setOffset(_ offset: CGFloat) {
centerYAnchor?.constant = offset
}
func numberOfItemsInSection(_ num: Int, section: Int) {
if section == 0 {
numberItemsForSections = num
} else {
numberItemsForSections += num
}
if let emptyView = emptyView {
self.delegate?.emptyDataSetView(emptyView)
if !(timer?.isValid ?? false) && emptyView.isHidden == true {
timer = Timer.scheduledTimer(timeInterval: 0.3, target: self, selector: #selector(timerHandler(_:)), userInfo: nil, repeats: false)
}
if numberItemsForSections > 0 {
self.emptyView?.isHidden = true
}
}
}
@objc func timerHandler(_ timer: Timer) {
if numberItemsForSections == 0 {
self.emptyView?.isHidden = false
} else {
self.emptyView?.isHidden = true
}
}
}
public class NCEmptyView: UIView {
@IBOutlet weak var emptyImage: UIImageView!
@IBOutlet weak var emptyTitle: UILabel!
@IBOutlet weak var emptyDescription: UILabel!
public override func awakeFromNib() {
super.awakeFromNib()
emptyTitle.textColor = NCBrandColor.shared.label
}
}
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