pEpForiOS/UI/EmailDisplay/EmailListViewController.swift
author Xavier Algarra <xavier@pep-project.org>
Tue, 07 Nov 2017 15:08:22 +0100
changeset 3369 e99419ad3c71
parent 3368 e79ab6166c5b
child 3419 f4c5d2ec661f
permissions -rw-r--r--
IOS-801 on delete crash fix
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//
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//  EmailListViewController.swift
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//  pEpForiOS
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//
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//  Created by Dirk Zimmermann on 16/04/16.
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//  Copyright © 2016 p≡p Security S.A. All rights reserved.
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//
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import UIKit
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import MessageModel
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import SwipeCellKit
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class EmailListViewController: BaseTableViewController, SwipeTableViewCellDelegate {
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    var folderToShow: Folder?
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    func updateLastLookAt() {
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        guard let saveFolder = folderToShow else {
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            return
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        }
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        saveFolder.updateLastLookAt()
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    }
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    private var model: EmailListViewModel?
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    private let queue: OperationQueue = {
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        let createe = OperationQueue()
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        createe.qualityOfService = .userInteractive
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        createe.maxConcurrentOperationCount = 10
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        return createe
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    }()
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    private var operations = [IndexPath:Operation]()
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    public static let storyboardId = "EmailListViewController"
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    fileprivate var lastSelectedIndexPath: IndexPath?
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    let searchController = UISearchController(searchResultsController: nil)
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    //swipe acctions types
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    var buttonDisplayMode: ButtonDisplayMode = .titleAndImage
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    var buttonStyle: ButtonStyle = .backgroundColor
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    // MARK: - Outlets
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    @IBOutlet weak var enableFilterButton: UIBarButtonItem!
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    @IBOutlet weak var textFilterButton: UIBarButtonItem!
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    @IBOutlet var showFoldersButton: UIBarButtonItem!
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    // MARK: - Life Cycle
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    override func viewDidLoad() {
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        super.viewDidLoad()
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        title = NSLocalizedString("Inbox", comment: "General name for (unified) inbox")
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        UIHelper.emailListTableHeight(self.tableView)
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        self.textFilterButton.isEnabled = false
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        addSearchBar()
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    }
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    override func viewWillAppear(_ animated: Bool) {
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        super.viewWillAppear(animated)
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        self.navigationController?.setToolbarHidden(false, animated: true)
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        if MiscUtil.isUnitTest() {
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            return
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        }
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        setDefaultColors()
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        setup()
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        // Mark this folder as having been looked at by the user
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        updateLastLookAt()
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        setupFoldersBarButton()
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    }
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    // MARK: - NavigationBar
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    private func hideFoldersNavigationBarButton() {
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        self.showFoldersButton.isEnabled = false
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        self.showFoldersButton.tintColor = UIColor.clear
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    }
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    private func showFoldersNavigationBarButton() {
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        self.showFoldersButton.isEnabled = true
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        self.showFoldersButton.tintColor = nil
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    }
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    private func resetModel() {
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        if folderToShow != nil {
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            model = EmailListViewModel(delegate: self,
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                                       messageSyncService: appConfig.messageSyncService,
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                                       folderToShow: folderToShow)
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        }
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    }
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    private func setup() {
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        if noAccountsExist() {
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            // No account exists. Show account setup.
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            performSegue(withIdentifier:.segueAddNewAccount, sender: self)
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        } else if let vm = model {
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            // We came back from e.g EmailView ...
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            updateFilterText()
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            // ... so we want to update "seen" status
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            vm.reloadData()
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        } else if folderToShow == nil {
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            // We have not been created to show a specific folder, thus we show unified inbox
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            folderToShow = UnifiedInbox()
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            resetModel()
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        } else if model == nil {
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            // We still got no model, because:
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            // - We are not coming back from a pushed view (for instance ComposeEmailView)
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            // - We are not a UnifiedInbox
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            // So we have been created to show a specific folder. Show it!
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            resetModel()
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        }
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        self.title = realNameOfFolderToShow()
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    }
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    private func weCameBackFromAPushedView() -> Bool {
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        return model != nil
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    }
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    private func noAccountsExist() -> Bool {
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        return Account.all().isEmpty
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    }
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    private func setupFoldersBarButton() {
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        if let size = navigationController?.viewControllers.count, size > 1 {
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            hideFoldersNavigationBarButton()
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        } else {
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            showFoldersNavigationBarButton()
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        }
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    }
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    private func addSearchBar() {
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        searchController.searchResultsUpdater = self
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        searchController.dimsBackgroundDuringPresentation = false
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        searchController.delegate = self
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        definesPresentationContext = true
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        tableView.tableHeaderView = searchController.searchBar
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        tableView.setContentOffset(CGPoint(x: 0.0, y: searchController.searchBar.frame.size.height), animated: false)
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    }
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    // MARK: - Other
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    private func realNameOfFolderToShow() -> String? {
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        return folderToShow?.realName
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    }
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    private func configure(cell: EmailListViewCell, for indexPath: IndexPath) {
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        // Configure lightweight stuff on main thread ...
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        guard let saveModel = model else {
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            return
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        }
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        guard let row = saveModel.row(for: indexPath) else {
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            Log.shared.errorAndCrash(component: #function, errorString: "We should have a row here")
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            return
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        }
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        cell.senderLabel.text = row.from
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        cell.subjectLabel.text = row.subject
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        cell.summaryLabel.text = row.bodyPeek
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        cell.isFlagged = row.isFlagged
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        cell.isSeen = row.isSeen
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        cell.hasAttachment = row.showAttchmentIcon
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        cell.dateLabel.text = row.dateText
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        // Set image from cache if any
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        cell.setContactImage(image: row.senderContactImage)
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        let op = BlockOperation() { [weak self] in
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            // ... and expensive computations in background
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            guard let strongSelf = self else {
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                // View is gone, nothing to do.
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                return
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            }
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            var senderImage: UIImage?
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            if row.senderContactImage == nil {
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                // image for identity has not been cached yet
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                // Get and cache it here in the background ...
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                senderImage = strongSelf.model?.senderImage(forCellAt: indexPath)
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                // ... and set it on the main queue
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                DispatchQueue.main.async {
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                    if senderImage != nil && senderImage != cell.contactImageView.image {
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                        cell.contactImageView.image  = senderImage
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                    }
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                }
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            }
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            let pEpRatingImage = strongSelf.model?.pEpRatingColorImage(forCellAt: indexPath)
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            // In theory we want to set all data in *one* async call. But as pEpRatingColorImage takes
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            // very long, we are setting the sender image seperatelly.
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            DispatchQueue.main.async {
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                if pEpRatingImage != nil {
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                    cell.setPepRatingImage(image: pEpRatingImage)
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                }
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            }
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        }
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        queue(operation: op, for: indexPath)
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    }
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    // MARK: - Actions
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    @IBAction func filterButtonHasBeenPressed(_ sender: UIBarButtonItem) {
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        guard let vm = model else {
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            Log.shared.errorAndCrash(component: #function, errorString: "We should have a model here")
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            return
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        }
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        vm.isFilterEnabled = !vm.isFilterEnabled
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        updateFilterButtonView()
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    }
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    func updateFilterButtonView() {
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        guard let vm = model else {
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            Log.shared.errorAndCrash(component: #function, errorString: "We should have a model here")
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            return
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        }
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        textFilterButton.isEnabled = vm.isFilterEnabled
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        if textFilterButton.isEnabled {
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            enableFilterButton.image = UIImage(named: "unread-icon-active")
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            updateFilterText()
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        } else {
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            textFilterButton.title = ""
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            enableFilterButton.image = UIImage(named: "unread-icon")
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        }
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    }
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    func updateFilterText() {
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        if let vm = model, let txt = vm.activeFilter?.title {
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            textFilterButton.title = "Filter by: " + txt
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        }
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    }
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    // MARK: - UITableViewDataSource
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    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
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        return model?.rowCount ?? 0
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    }
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    override func tableView(_ tableView: UITableView,
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                            cellForRowAt indexPath: IndexPath) -> UITableViewCell {
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        guard let cell = tableView.dequeueReusableCell(withIdentifier: EmailListViewCell.storyboardId,
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                                                       for: indexPath) as? EmailListViewCell
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            else {
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                Log.shared.errorAndCrash(component: #function, errorString: "Wrong cell!")
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                return UITableViewCell()
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        }
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        cell.delegate = self
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        configure(cell: cell, for: indexPath)
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        return cell
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    }
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    // MARK: - UITableViewDelegate
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    func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath, for orientation: SwipeActionsOrientation) -> [SwipeAction]? {
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        if indexPath.section == 0 {
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            let deleteAction = SwipeAction(style: .destructive, title: "Delete") { action, indexPath in
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                self.deleteAction(forCellAt: indexPath)
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            }
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            configure(action: deleteAction, with: .trash)
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            let flagAction = SwipeAction(style: .default, title: "Flag") { action, indexPath in
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                self.flagAction(forCellAt: indexPath)
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            }
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            flagAction.hidesWhenSelected = true
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            configure(action: flagAction, with: .flag)
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            let moreAction = SwipeAction(style: .default, title: "More") { action, indexPath in
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                self.moreAction(forCellAt: indexPath)
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            }
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            moreAction.hidesWhenSelected = true
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            configure(action: moreAction, with: .more)
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            return (orientation == .right ?   [deleteAction, flagAction, moreAction] : nil)
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        }
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        return nil
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    }
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    func tableView(_ tableView: UITableView, editActionsOptionsForRowAt indexPath: IndexPath, for orientation: SwipeActionsOrientation) -> SwipeTableOptions {
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        var options = SwipeTableOptions()
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        options.expansionStyle = .destructive
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        options.transitionStyle = .border
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        options.buttonSpacing = 11
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        return options
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    }
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    func configure(action: SwipeAction, with descriptor: ActionDescriptor) {
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        action.title = descriptor.title(forDisplayMode: buttonDisplayMode)
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        action.image = descriptor.image(forStyle: buttonStyle, displayMode: buttonDisplayMode)
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        switch buttonStyle {
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        case .backgroundColor:
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            action.backgroundColor = descriptor.color
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        case .circular:
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            action.backgroundColor = .clear
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            action.textColor = descriptor.color
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            action.font = .systemFont(ofSize: 13)
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            action.transitionDelegate = ScaleTransition.default
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        }
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    }
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    override func tableView(_ tableView: UITableView, didEndDisplaying cell: UITableViewCell, forRowAt indexPath: IndexPath) {
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        cancelOperation(for: indexPath)
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    }
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    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
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        lastSelectedIndexPath = indexPath
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        tableView.selectRow(at: indexPath, animated: true, scrollPosition: .none)
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        performSegue(withIdentifier: SegueIdentifier.segueShowEmail, sender: self)
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    }
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    // Implemented to get informed about the scrolling position.
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    // If the user has scrolled down (almost) to the end, we need to get older emails to display.
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    override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell,
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                            forRowAt indexPath: IndexPath) {
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        guard let vm = model else {
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            Log.shared.errorAndCrash(component: #function, errorString: "No model.")
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            return
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        }
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        vm.fetchOlderMessagesIfRequired(forIndexPath: indexPath)
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    }
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    // MARK: - Queue Handling
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    private func queue(operation op:Operation, for indexPath: IndexPath) {
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        operations[indexPath] = op
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        queue.addOperation(op)
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    }
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    private func cancelOperation(for indexPath:IndexPath) {
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        guard let op = operations.removeValue(forKey: indexPath) else {
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            return
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        }
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        if !op.isCancelled  {
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            op.cancel()
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        }
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    }
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    // MARK: -
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    override func didReceiveMemoryWarning() {
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        model?.freeMemory()
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    }
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}
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// MARK: - UISearchResultsUpdating, UISearchControllerDelegate
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extension EmailListViewController: UISearchResultsUpdating, UISearchControllerDelegate {
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    public func updateSearchResults(for searchController: UISearchController) {
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        guard let vm = model, let searchText = searchController.searchBar.text else {
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            return
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        }
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        vm.setSearchFilter(forSearchText: searchText)
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    }
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    func didDismissSearchController(_ searchController: UISearchController) {
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        guard let vm = model else {
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            return
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        }
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        vm.removeSearchFilter()
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    }
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}
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// MARK: - EmailListModelDelegate
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extension EmailListViewController: EmailListViewModelDelegate {
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    func emailListViewModel(viewModel: EmailListViewModel, didInsertDataAt indexPath: IndexPath) {
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        tableView.beginUpdates()
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        tableView.insertRows(at: [indexPath], with: .automatic)
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        tableView.endUpdates()
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    }
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    func emailListViewModel(viewModel: EmailListViewModel, didRemoveDataAt indexPath: IndexPath) {
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   374
        tableView.beginUpdates()
andreas@3151
   375
        tableView.deleteRows(at: [indexPath], with: .automatic)
andreas@3151
   376
        tableView.endUpdates()
andreas@3151
   377
    }
andreas@3208
   378
    
andreas@3151
   379
    func emailListViewModel(viewModel: EmailListViewModel, didUpdateDataAt indexPath: IndexPath) {
andreas@3151
   380
        tableView.beginUpdates()
andreas@3151
   381
        tableView.reloadRows(at: [indexPath], with: .none)
andreas@3151
   382
        tableView.endUpdates()
andreas@3151
   383
    }
andreas@3208
   384
    
andreas@3151
   385
    func updateView() {
andreas@3151
   386
        self.tableView.reloadData()
andreas@3151
   387
    }
andreas@3151
   388
}
andreas@3151
   389
andreas@3151
   390
// MARK: - ActionSheet & ActionSheet Actions
andreas@3151
   391
andreas@3151
   392
extension EmailListViewController {
andreas@3166
   393
    func showMoreActionSheet(forRowAt indexPath: IndexPath) {
andreas@3151
   394
        lastSelectedIndexPath = indexPath
igor@1242
   395
        let alertControler = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
igor@1438
   396
        alertControler.view.tintColor = .pEpGreen
igor@1242
   397
        let cancelAction = createCancelAction()
andreas@3151
   398
        let replyAction = createReplyAction()
andreas@3151
   399
        let replyAllAction = createReplyAllAction()
andreas@3151
   400
        let forwardAction = createForwardAction()
igor@1242
   401
        alertControler.addAction(cancelAction)
igor@1242
   402
        alertControler.addAction(replyAction)
xavier@1620
   403
        alertControler.addAction(replyAllAction)
igor@1242
   404
        alertControler.addAction(forwardAction)
igor@1414
   405
        if let popoverPresentationController = alertControler.popoverPresentationController {
andreas@3151
   406
            popoverPresentationController.sourceView = tableView
igor@1414
   407
        }
igor@1242
   408
        present(alertControler, animated: true, completion: nil)
igor@1242
   409
    }
andreas@3208
   410
    
andreas@3151
   411
    // MARK: Action Sheet Actions
andreas@3208
   412
    
igor@1242
   413
    func createCancelAction() -> UIAlertAction {
andreas@3151
   414
        return  UIAlertAction(title: "Cancel", style: .cancel) { (action) in
andreas@3151
   415
            self.tableView.beginUpdates()
andreas@3151
   416
            self.tableView.setEditing(false, animated: true)
andreas@3151
   417
            self.tableView.endUpdates()
igor@1242
   418
        }
igor@1242
   419
    }
andreas@3208
   420
    
andreas@3151
   421
    func createReplyAction() ->  UIAlertAction {
andreas@3151
   422
        return UIAlertAction(title: "Reply", style: .default) { (action) in
andreas@3151
   423
            self.performSegue(withIdentifier: .segueReply, sender: self)
xavier@1620
   424
        }
xavier@1620
   425
    }
andreas@3208
   426
    
andreas@3151
   427
    func createReplyAllAction() ->  UIAlertAction {
andreas@3151
   428
        return UIAlertAction(title: "Reply All", style: .default) { (action) in
andreas@3151
   429
            self.performSegue(withIdentifier: .segueReplyAll, sender: self)
igor@1242
   430
        }
igor@1242
   431
    }
andreas@3208
   432
    
andreas@3151
   433
    func createForwardAction() -> UIAlertAction {
andreas@3151
   434
        return UIAlertAction(title: "Forward", style: .default) { (action) in
andreas@3151
   435
            self.performSegue(withIdentifier: .segueForward, sender: self)
xavier@2369
   436
        }
igor@1301
   437
    }
igor@1301
   438
}
igor@1338
   439
andreas@3151
   440
// MARK: - TableViewCell Actions
andreas@3151
   441
andreas@3151
   442
extension EmailListViewController {
andreas@3151
   443
    private func createRowAction(image: UIImage?,
xavier@3266
   444
                                 action: @escaping (UITableViewRowAction, IndexPath) -> Void
xavier@3266
   445
        ) -> UITableViewRowAction {
xavier@3266
   446
        let rowAction = UITableViewRowAction(style: .normal, title: nil, handler: action)
andreas@3151
   447
        if let theImage = image {
andreas@3151
   448
            let iconColor = UIColor(patternImage: theImage)
andreas@3151
   449
            rowAction.backgroundColor = iconColor
andreas@3151
   450
        }
andreas@3151
   451
        return rowAction
andreas@3151
   452
    }
andreas@3208
   453
    
xavier@3369
   454
    func flagAction(forCellAt indexPath: IndexPath) {
andreas@3151
   455
        guard let row = model?.row(for: indexPath) else {
andreas@3151
   456
            Log.shared.errorAndCrash(component: #function, errorString: "No data for indexPath!")
xavier@3369
   457
            return
andreas@3151
   458
        }
xavier@3369
   459
        if row.isFlagged {
xavier@3369
   460
            model?.unsetFlagged(forIndexPath: indexPath)
xavier@3369
   461
        } else {
xavier@3369
   462
            model?.setFlagged(forIndexPath: indexPath)
andreas@3151
   463
        }
xavier@3369
   464
        tableView.beginUpdates()
xavier@3369
   465
        tableView.setEditing(false, animated: true)
xavier@3369
   466
        tableView.reloadRows(at: [indexPath], with: .none)
xavier@3369
   467
        tableView.endUpdates()
andreas@3151
   468
    }
andreas@3208
   469
    
xavier@3369
   470
    func deleteAction(forCellAt indexPath: IndexPath) {
xavier@3369
   471
        model?.delete(forIndexPath: indexPath) // mark for deletion/trash
andreas@3151
   472
    }
andreas@3208
   473
    
xavier@3369
   474
    func moreAction(forCellAt indexPath: IndexPath) {
xavier@3369
   475
        self.showMoreActionSheet(forRowAt: indexPath)
andreas@3151
   476
    }
andreas@3151
   477
}
andreas@3151
   478
andreas@3151
   479
// MARK: - SegueHandlerType
igor@1338
   480
igor@1338
   481
extension EmailListViewController: SegueHandlerType {
andreas@3208
   482
    
igor@1338
   483
    enum SegueIdentifier: String {
igor@1338
   484
        case segueAddNewAccount
igor@1338
   485
        case segueShowEmail
igor@1338
   486
        case segueCompose
xavier@2715
   487
        case segueReply
xavier@1623
   488
        case segueReplyAll
xavier@1664
   489
        case segueForward
xavier@1865
   490
        case segueFilter
xavier@2248
   491
        case segueFolderViews
igor@1338
   492
        case noSegue
igor@1338
   493
    }
andreas@3208
   494
    
andreas@3110
   495
    private func setup(composeViewController vc: ComposeTableViewController,
andreas@3110
   496
                       composeMode: ComposeTableViewController.ComposeMode = .normal,
andreas@3110
   497
                       originalMessage: Message? = nil) {
andreas@3110
   498
        vc.appConfig = appConfig
andreas@3110
   499
        vc.composeMode = composeMode
andreas@3110
   500
        vc.originalMessage = originalMessage
andreas@3223
   501
        vc.origin = folderToShow?.account.user
andreas@3110
   502
    }
andreas@3208
   503
    
igor@1338
   504
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
igor@1338
   505
        switch segueIdentifier(for: segue) {
xavier@2715
   506
        case .segueReply:
andreas@2850
   507
            guard let nav = segue.destination as? UINavigationController,
xavier@2715
   508
                let destination = nav.topViewController as? ComposeTableViewController,
andreas@3151
   509
                let indexPath = lastSelectedIndexPath,
andreas@3151
   510
                let message = model?.message(representedByRowAt: indexPath) else {
andreas@2850
   511
                    Log.shared.errorAndCrash(component: #function, errorString: "Segue issue")
andreas@2850
   512
                    return
xavier@2715
   513
            }
andreas@3110
   514
            setup(composeViewController: destination, composeMode: .replyFrom,
andreas@3151
   515
                  originalMessage: message)
xavier@1623
   516
        case .segueReplyAll:
andreas@2850
   517
            guard let nav = segue.destination as? UINavigationController,
xavier@1623
   518
                let destination = nav.topViewController as? ComposeTableViewController,
andreas@3151
   519
                let indexPath = lastSelectedIndexPath,
andreas@3151
   520
                let message = model?.message(representedByRowAt: indexPath) else {
andreas@2850
   521
                    Log.shared.errorAndCrash(component: #function, errorString: "Segue issue")
andreas@2850
   522
                    return
xavier@1623
   523
            }
andreas@3110
   524
            setup(composeViewController: destination, composeMode: .replyAll,
andreas@3151
   525
                  originalMessage: message)
andreas@3111
   526
        case .segueShowEmail:
andreas@2850
   527
            guard let vc = segue.destination as? EmailViewController,
andreas@3151
   528
                let indexPath = lastSelectedIndexPath,
andreas@3208
   529
                let message = model?.message(representedByRowAt: indexPath) else {
andreas@2850
   530
                    Log.shared.errorAndCrash(component: #function, errorString: "Segue issue")
andreas@2850
   531
                    return
igor@1338
   532
            }
andreas@2850
   533
            vc.appConfig = appConfig
andreas@3151
   534
            vc.message = message
andreas@3223
   535
            vc.folderShow = folderToShow
andreas@3166
   536
            vc.messageId = indexPath.row //that looks wrong
xavier@1664
   537
        case .segueForward:
andreas@2850
   538
            guard let nav = segue.destination as? UINavigationController,
xavier@1664
   539
                let destination = nav.topViewController as? ComposeTableViewController,
andreas@3151
   540
                let indexPath = lastSelectedIndexPath,
andreas@3151
   541
                let message = model?.message(representedByRowAt: indexPath) else {
andreas@2850
   542
                    Log.shared.errorAndCrash(component: #function, errorString: "Segue issue")
andreas@2850
   543
                    return
xavier@1664
   544
            }
andreas@3110
   545
            setup(composeViewController: destination, composeMode: .forward,
andreas@3151
   546
                  originalMessage: message)
andreas@2850
   547
        case .segueFilter:
andreas@2850
   548
            guard let destiny = segue.destination as? FilterTableViewController  else {
andreas@2850
   549
                Log.shared.errorAndCrash(component: #function, errorString: "Segue issue")
andreas@2850
   550
                return
andreas@2850
   551
            }
andreas@2850
   552
            destiny.appConfig = appConfig
andreas@3163
   553
            destiny.filterDelegate = model
andreas@2850
   554
            destiny.inFolder = false
andreas@3223
   555
            destiny.filterEnabled = folderToShow?.filter
andreas@2850
   556
            destiny.hidesBottomBarWhenPushed = true
andreas@2850
   557
        case .segueAddNewAccount:
andreas@2850
   558
            guard let vc = segue.destination as? LoginTableViewController  else {
andreas@2850
   559
                Log.shared.errorAndCrash(component: #function, errorString: "Segue issue")
andreas@2850
   560
                return
andreas@2850
   561
            }
andreas@2850
   562
            vc.appConfig = appConfig
andreas@2850
   563
            vc.hidesBottomBarWhenPushed = true
xavier@1664
   564
            break
andreas@2850
   565
        case .segueFolderViews:
andreas@2850
   566
            guard let vC = segue.destination as? FolderTableViewController  else {
andreas@2850
   567
                Log.shared.errorAndCrash(component: #function, errorString: "Segue issue")
andreas@2850
   568
                return
xavier@1865
   569
            }
andreas@2850
   570
            vC.appConfig = appConfig
andreas@2850
   571
            vC.hidesBottomBarWhenPushed = true
xavier@1865
   572
            break
andreas@2850
   573
        case .segueCompose:
andreas@2850
   574
            guard let nav = segue.destination as? UINavigationController,
dirk@2957
   575
                let destination = nav.rootViewController as? ComposeTableViewController else {
andreas@2850
   576
                    Log.shared.errorAndCrash(component: #function, errorString: "Segue issue")
andreas@2850
   577
                    return
dirk@2240
   578
            }
andreas@3110
   579
            setup(composeViewController: destination)
andreas@2850
   580
        default:
andreas@2850
   581
            Log.shared.errorAndCrash(component: #function, errorString: "Unhandled segue")
dirk@1694
   582
            break
igor@1338
   583
        }
andreas@2838
   584
    }
andreas@3208
   585
    
andreas@3166
   586
    @IBAction func segueUnwindAccountAdded(segue: UIStoryboardSegue) {
andreas@3151
   587
        // nothing to do.
andreas@3150
   588
    }
dirk@1348
   589
}
xavier@3368
   590
xavier@3368
   591
//enums to simplify configurations
xavier@3368
   592
xavier@3368
   593
enum ActionDescriptor {
xavier@3368
   594
    case read, more, flag, trash
xavier@3368
   595
xavier@3368
   596
    func title(forDisplayMode displayMode: ButtonDisplayMode) -> String? {
xavier@3368
   597
        guard displayMode != .imageOnly else { return nil }
xavier@3368
   598
xavier@3368
   599
        switch self {
xavier@3368
   600
        case .read: return NSLocalizedString("Read", comment: "read button")
xavier@3368
   601
        case .more: return NSLocalizedString("More", comment: "more button")
xavier@3368
   602
        case .flag: return NSLocalizedString("Flag", comment: "read button")
xavier@3368
   603
        case .trash: return NSLocalizedString("Trash", comment: "Trash button")
xavier@3368
   604
        }
xavier@3368
   605
    }
xavier@3368
   606
xavier@3368
   607
    func image(forStyle style: ButtonStyle, displayMode: ButtonDisplayMode) -> UIImage? {
xavier@3368
   608
        guard displayMode != .titleOnly else { return nil }
xavier@3368
   609
xavier@3368
   610
        let name: String
xavier@3368
   611
        switch self {
xavier@3368
   612
        case .read: name = "read"
xavier@3368
   613
        case .more: name = "more"
xavier@3368
   614
        case .flag: name = "flag"
xavier@3368
   615
        case .trash: name = "trash"
xavier@3368
   616
        }
xavier@3368
   617
xavier@3368
   618
        return UIImage(named: "swipe-" + name)
xavier@3368
   619
    }
xavier@3368
   620
xavier@3368
   621
    var color: UIColor {
xavier@3368
   622
        switch self {
xavier@3368
   623
        case .read: return #colorLiteral(red: 0.2980392157, green: 0.8509803922, blue: 0.3921568627, alpha: 1)
xavier@3368
   624
        case .more: return #colorLiteral(red: 0.7803494334, green: 0.7761332393, blue: 0.7967314124, alpha: 1)
xavier@3368
   625
        case .flag: return #colorLiteral(red: 1, green: 0.5803921569, blue: 0, alpha: 1)
xavier@3368
   626
        case .trash: return #colorLiteral(red: 1, green: 0.2352941176, blue: 0.1882352941, alpha: 1)
xavier@3368
   627
        }
xavier@3368
   628
    }
xavier@3368
   629
}
xavier@3368
   630
xavier@3368
   631
enum ButtonDisplayMode {
xavier@3368
   632
    case titleAndImage, titleOnly, imageOnly
xavier@3368
   633
}
xavier@3368
   634
xavier@3368
   635
enum ButtonStyle {
xavier@3368
   636
    case backgroundColor, circular
xavier@3368
   637
}