space-ios/iOSClient/BackgroundImage/NCBackgroundImage.swift

//
//  NCBackgroundImage.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 05/05/21.
//  Copyright © 2021 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
import ChromaColorPicker

class NCBackgroundImage: UIViewController {

    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet weak var closeButton: UIButton!
    @IBOutlet weak var chromaColorPickerView: UIView!
    
    private let colorPicker = ChromaColorPicker()
    private let brightnessSlider = ChromaBrightnessSlider()
    private let defaultColorPickerSize = CGSize(width: 200, height: 200)
    private let brightnessSliderWidthHeightRatio: CGFloat = 0.1

    public var collectionViewCommon: NCCollectionViewCommon?
    
    let width: CGFloat = 300
    let height: CGFloat = 500
    
    // MARK: - View Life Cycle

    override func viewDidLoad() {
        super.viewDidLoad()
        
        setupColorPicker()
        setupBrightnessSlider()
        setupColorPickerHandles()
        titleLabel.text = NSLocalizedString("_background_", comment: "")
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
    }
    
    // MARK: - Action
    
    @IBAction func actionClose(_ sender: UIButton) {
        dismiss(animated: true)
    }
    
    // MARK: - ChromaColorPicker
    
    private func setupColorPicker() {
        colorPicker.delegate = self
        colorPicker.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(colorPicker)

        NSLayoutConstraint.activate([
            colorPicker.centerXAnchor.constraint(equalTo: chromaColorPickerView.centerXAnchor),
            colorPicker.topAnchor.constraint(equalTo: chromaColorPickerView.topAnchor),
            colorPicker.widthAnchor.constraint(equalToConstant: defaultColorPickerSize.width),
            colorPicker.heightAnchor.constraint(equalToConstant: defaultColorPickerSize.height)
        ])
    }
    
    private func setupBrightnessSlider() {
        brightnessSlider.connect(to: colorPicker)
        
        // Style
        brightnessSlider.trackColor = UIColor.blue
        brightnessSlider.handle.borderWidth = 3.0 // Example of customizing the handle's properties.
        
        // Layout
        brightnessSlider.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(brightnessSlider)
        
        NSLayoutConstraint.activate([
            brightnessSlider.centerXAnchor.constraint(equalTo: colorPicker.centerXAnchor),
            brightnessSlider.topAnchor.constraint(equalTo: colorPicker.bottomAnchor, constant: 20),
            brightnessSlider.widthAnchor.constraint(equalTo: colorPicker.widthAnchor, multiplier: 1),
            brightnessSlider.heightAnchor.constraint(equalTo: brightnessSlider.widthAnchor, multiplier: brightnessSliderWidthHeightRatio)
        ])
    }
    
    private func setupColorPickerHandles() {
      
        let peachColor = collectionViewCommon?.collectionView.backgroundColor //UIColor(red: 1, green: 203 / 255, blue: 164 / 255, alpha: 1)
        colorPicker.addHandle(at: peachColor)
    }
}

extension NCBackgroundImage: ChromaColorPickerDelegate {
    func colorPickerHandleDidChange(_ colorPicker: ChromaColorPicker, handle: ChromaColorHandle, to color: UIColor) {
        print("x")
        
        /*
        colorDisplayView.backgroundColor = color
        
        // Here I can detect when the color is too bright to show a white icon
        // on the handle and change its tintColor.
        if handle === homeHandle, let imageView = homeHandle.accessoryView as? UIImageView {
            let colorIsBright = color.isLight
            
            UIView.animate(withDuration: 0.2, animations: {
                imageView.tintColor = colorIsBright ? .black : .white
            }, completion: nil)
        }
        */
        
        collectionViewCommon?.collectionView.backgroundColor = color
    }
}