mirror of
https://github.com/oxen-io/session-ios.git
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451 lines
16 KiB
Swift
451 lines
16 KiB
Swift
//
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// Copyright (c) 2017 Open Whisper Systems. All rights reserved.
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//
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import Foundation
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@objc
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protocol GifPickerViewControllerDelegate: class {
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func gifPickerWillSend()
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func gifPickerDidSend(outgoingMessage: TSOutgoingMessage)
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}
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class GifPickerViewController: OWSViewController, UISearchBarDelegate, UICollectionViewDataSource, UICollectionViewDelegate, GifPickerLayoutDelegate {
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let TAG = "[GifPickerViewController]"
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// MARK: Properties
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enum ViewMode {
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case idle, searching, results, noResults, error
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}
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private var viewMode = ViewMode.idle {
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didSet {
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Logger.info("\(TAG) viewMode: \(viewMode)")
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updateContents()
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}
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}
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var lastQuery: String = ""
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public weak var delegate: GifPickerViewControllerDelegate?
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var thread: TSThread?
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var messageSender: MessageSender?
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let searchBar: UISearchBar
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let layout: GifPickerLayout
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let collectionView: UICollectionView
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var noResultsView: UILabel?
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var searchErrorView: UILabel?
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var activityIndicator: UIActivityIndicatorView?
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var imageInfos = [GiphyImageInfo]()
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var reachability: Reachability?
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private let kCellReuseIdentifier = "kCellReuseIdentifier"
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var progressiveSearchTimer: Timer?
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// MARK: Initializers
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@available(*, unavailable, message:"use other constructor instead.")
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required init?(coder aDecoder: NSCoder) {
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self.thread = nil
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self.messageSender = nil
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self.searchBar = UISearchBar()
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self.layout = GifPickerLayout()
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self.collectionView = UICollectionView(frame: CGRect.zero, collectionViewLayout: self.layout)
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super.init(coder: aDecoder)
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owsFail("\(self.TAG) invalid constructor")
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}
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required init(thread: TSThread, messageSender: MessageSender) {
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self.thread = thread
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self.messageSender = messageSender
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self.searchBar = UISearchBar()
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self.layout = GifPickerLayout()
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self.collectionView = UICollectionView(frame: CGRect.zero, collectionViewLayout: self.layout)
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super.init(nibName: nil, bundle: nil)
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self.layout.delegate = self
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}
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deinit {
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NotificationCenter.default.removeObserver(self)
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progressiveSearchTimer?.invalidate()
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}
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func didBecomeActive() {
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AssertIsOnMainThread()
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Logger.info("\(self.TAG) \(#function)")
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// Prod cells to try to load when app becomes active.
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ensureCellState()
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}
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func reachabilityChanged() {
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AssertIsOnMainThread()
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Logger.info("\(self.TAG) \(#function)")
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// Prod cells to try to load when connectivity changes.
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ensureCellState()
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}
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func ensureCellState() {
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for cell in self.collectionView.visibleCells {
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guard let cell = cell as? GifPickerCell else {
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owsFail("\(TAG) unexpected cell.")
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return
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}
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cell.ensureCellState()
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}
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}
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// MARK: View Lifecycle
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override func viewDidLoad() {
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super.viewDidLoad()
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self.navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .cancel,
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target: self,
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action: #selector(donePressed))
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self.navigationItem.title = NSLocalizedString("GIF_PICKER_VIEW_TITLE",
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comment: "Title for the 'gif picker' dialog.")
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createViews()
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reachability = Reachability.forInternetConnection()
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NotificationCenter.default.addObserver(self,
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selector: #selector(reachabilityChanged),
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name: NSNotification.Name.reachabilityChanged,
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object: nil)
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NotificationCenter.default.addObserver(self,
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selector: #selector(didBecomeActive),
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name: NSNotification.Name.UIApplicationDidBecomeActive,
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object: nil)
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}
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override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(animated)
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self.searchBar.becomeFirstResponder()
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}
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override func viewWillDisappear(_ animated: Bool) {
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super.viewWillDisappear(animated)
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progressiveSearchTimer?.invalidate()
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progressiveSearchTimer = nil
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}
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// MARK: Views
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private func createViews() {
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view.backgroundColor = UIColor.white
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// Search
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searchBar.searchBarStyle = .minimal
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searchBar.delegate = self
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searchBar.placeholder = NSLocalizedString("GIF_VIEW_SEARCH_PLACEHOLDER_TEXT",
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comment: "Placeholder text for the search field in gif view")
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searchBar.backgroundColor = UIColor.white
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self.view.addSubview(searchBar)
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searchBar.autoPinWidthToSuperview()
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searchBar.autoPin(toTopLayoutGuideOf: self, withInset: 0)
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self.collectionView.delegate = self
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self.collectionView.dataSource = self
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self.collectionView.backgroundColor = UIColor.white
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self.collectionView.register(GifPickerCell.self, forCellWithReuseIdentifier: kCellReuseIdentifier)
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self.view.addSubview(self.collectionView)
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self.collectionView.autoPinWidthToSuperview()
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self.collectionView.autoPinEdge(.top, to: .bottom, of: searchBar)
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let bottomBanner = UIView()
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bottomBanner.backgroundColor = UIColor.black
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self.view.addSubview(bottomBanner)
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bottomBanner.autoPinWidthToSuperview()
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bottomBanner.autoPinEdge(.top, to: .bottom, of: self.collectionView)
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bottomBanner.autoPin(toBottomLayoutGuideOf: self, withInset: 0)
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// The Giphy API requires us to "show their trademark prominently" in our GIF experience.
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let logoImage = UIImage(named: "giphy_logo")
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let logoImageView = UIImageView(image: logoImage)
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bottomBanner.addSubview(logoImageView)
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logoImageView.autoPinHeightToSuperview(withMargin: 3)
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logoImageView.autoHCenterInSuperview()
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let noResultsView = createErrorLabel(text: NSLocalizedString("GIF_VIEW_SEARCH_NO_RESULTS",
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comment: "Indicates that the user's search had no results."))
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self.noResultsView = noResultsView
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self.view.addSubview(noResultsView)
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noResultsView.autoPinWidthToSuperview(withMargin: 20)
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noResultsView.autoVCenterInSuperview()
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let searchErrorView = createErrorLabel(text: NSLocalizedString("GIF_VIEW_SEARCH_ERROR",
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comment: "Indicates that an error occured while searching."))
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self.searchErrorView = searchErrorView
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self.view.addSubview(searchErrorView)
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searchErrorView.autoPinWidthToSuperview(withMargin: 20)
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searchErrorView.autoVCenterInSuperview()
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searchErrorView.isUserInteractionEnabled = true
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searchErrorView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(retryTapped)))
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let activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .gray)
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self.activityIndicator = activityIndicator
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self.view.addSubview(activityIndicator)
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activityIndicator.autoCenterInSuperview()
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self.updateContents()
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}
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private func createErrorLabel(text: String) -> UILabel {
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let label = UILabel()
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label.text = text
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label.textColor = UIColor.black
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label.font = UIFont.ows_mediumFont(withSize: 20)
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label.textAlignment = .center
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label.numberOfLines = 0
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label.lineBreakMode = .byWordWrapping
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return label
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}
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private func updateContents() {
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guard let noResultsView = self.noResultsView else {
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owsFail("Missing noResultsView")
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return
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}
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guard let searchErrorView = self.searchErrorView else {
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owsFail("Missing searchErrorView")
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return
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}
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guard let activityIndicator = self.activityIndicator else {
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owsFail("Missing activityIndicator")
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return
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}
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switch viewMode {
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case .idle:
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self.collectionView.isHidden = true
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noResultsView.isHidden = true
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searchErrorView.isHidden = true
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activityIndicator.isHidden = true
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activityIndicator.stopAnimating()
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case .searching:
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self.collectionView.isHidden = true
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noResultsView.isHidden = true
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searchErrorView.isHidden = true
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activityIndicator.isHidden = false
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activityIndicator.startAnimating()
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case .results:
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self.collectionView.isHidden = false
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noResultsView.isHidden = true
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searchErrorView.isHidden = true
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activityIndicator.isHidden = true
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activityIndicator.stopAnimating()
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self.collectionView.collectionViewLayout.invalidateLayout()
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self.collectionView.reloadData()
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case .noResults:
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self.collectionView.isHidden = true
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noResultsView.isHidden = false
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searchErrorView.isHidden = true
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activityIndicator.isHidden = true
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activityIndicator.stopAnimating()
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case .error:
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self.collectionView.isHidden = true
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noResultsView.isHidden = true
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searchErrorView.isHidden = false
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activityIndicator.isHidden = true
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activityIndicator.stopAnimating()
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}
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}
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// MARK: - UICollectionViewDataSource
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public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
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return imageInfos.count
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}
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public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
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let imageInfo = imageInfos[indexPath.row]
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let cell = collectionView.dequeueReusableCell(withReuseIdentifier: kCellReuseIdentifier, for: indexPath)
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guard let gifCell = cell as? GifPickerCell else {
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owsFail("\(TAG) Unexpected cell type.")
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return cell
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}
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gifCell.imageInfo = imageInfo
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return cell
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}
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// MARK: - UICollectionViewDelegate
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public func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
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guard let cell = collectionView.cellForItem(at: indexPath) as? GifPickerCell else {
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owsFail("\(TAG) unexpected cell.")
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return
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}
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guard let asset = cell.animatedAsset else {
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Logger.info("\(TAG) unload cell selected.")
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return
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}
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let filePath = asset.filePath
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guard let dataSource = DataSourcePath.dataSource(withFilePath: filePath) else {
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owsFail("\(TAG) couldn't load asset.")
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return
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}
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let attachment = SignalAttachment(dataSource: dataSource, dataUTI: asset.rendition.utiType)
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guard let thread = thread else {
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owsFail("\(TAG) Missing thread.")
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return
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}
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guard let messageSender = messageSender else {
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owsFail("\(TAG) Missing messageSender.")
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return
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}
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self.delegate?.gifPickerWillSend()
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let outgoingMessage = ThreadUtil.sendMessage(with: attachment, in: thread, messageSender: messageSender)
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self.delegate?.gifPickerDidSend(outgoingMessage: outgoingMessage)
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dismiss(animated: true, completion: nil)
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}
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public func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
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guard let cell = cell as? GifPickerCell else {
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owsFail("\(TAG) unexpected cell.")
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return
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}
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// We only want to load the cells which are on-screen.
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cell.isCellVisible = true
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}
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public func collectionView(_ collectionView: UICollectionView, didEndDisplaying cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
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guard let cell = cell as? GifPickerCell else {
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owsFail("\(TAG) unexpected cell.")
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return
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}
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cell.isCellVisible = false
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}
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// MARK: - Event Handlers
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func donePressed(sender: UIButton) {
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dismiss(animated: true, completion: nil)
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}
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// MARK: - UISearchBarDelegate
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public func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
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// Clear error messages immediately.
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if viewMode == .error || viewMode == .noResults {
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viewMode = .idle
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}
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// Do progressive search after a delay.
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progressiveSearchTimer?.invalidate()
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progressiveSearchTimer = nil
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let kProgressiveSearchDelaySeconds = 2.0
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progressiveSearchTimer = WeakTimer.scheduledTimer(timeInterval: kProgressiveSearchDelaySeconds, target: self, userInfo: nil, repeats: true) { [weak self] _ in
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guard let strongSelf = self else {
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return
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}
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strongSelf.tryToSearch(dismissKeyboard: false)
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}
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}
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public func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
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tryToSearch()
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}
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public func tryToSearch(dismissKeyboard: Bool = true) {
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progressiveSearchTimer?.invalidate()
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progressiveSearchTimer = nil
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guard let text = searchBar.text else {
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OWSAlerts.showAlert(withTitle: NSLocalizedString("ALERT_ERROR_TITLE",
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comment: ""),
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message: NSLocalizedString("GIF_PICKER_VIEW_MISSING_QUERY",
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comment: "Alert message shown when user tries to search for GIFs without entering any search terms."))
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return
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}
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let query = (text as String).trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
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if (viewMode == .searching || viewMode == .results) && lastQuery == query {
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Logger.info("\(TAG) ignoring duplicate search: \(query)")
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if dismissKeyboard {
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self.searchBar.resignFirstResponder()
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}
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return
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}
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search(query: query, dismissKeyboard: dismissKeyboard)
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}
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private func search(query: String, dismissKeyboard: Bool = true) {
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Logger.info("\(TAG) searching: \(query)")
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progressiveSearchTimer?.invalidate()
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progressiveSearchTimer = nil
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if dismissKeyboard {
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self.searchBar.resignFirstResponder()
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}
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imageInfos = []
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viewMode = .searching
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lastQuery = query
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self.collectionView.contentOffset = CGPoint.zero
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GiphyAPI.sharedInstance.search(query: query, success: { [weak self] imageInfos in
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guard let strongSelf = self else { return }
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Logger.info("\(strongSelf.TAG) search complete")
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strongSelf.imageInfos = imageInfos
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if imageInfos.count > 0 {
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strongSelf.viewMode = .results
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} else {
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strongSelf.viewMode = .noResults
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}
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},
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failure: { [weak self] _ in
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guard let strongSelf = self else { return }
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Logger.info("\(strongSelf.TAG) search failed.")
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// TODO: Present this error to the user.
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strongSelf.viewMode = .error
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})
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}
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// MARK: - GifPickerLayoutDelegate
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func imageInfosForLayout() -> [GiphyImageInfo] {
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return imageInfos
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}
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// MARK: - Event Handlers
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func retryTapped(sender: UIGestureRecognizer) {
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guard sender.state == .recognized else {
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return
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}
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guard viewMode == .error else {
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return
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}
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tryToSearch()
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}
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}
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