MediaCategory: Add Play All button for the artists' collections

Add of a play all button to the artists' collections to allow the
users to play the medias of the selected artist.

Closes #836

Author: diogo-simaomarques

Resources/en.lproj/Localizable.strings

@@ -193,6 +193,7 @@
 "NEXT_BUTTON" = "Next";
 "PREV_BUTTON" = "Previous";
 "PLAY_ALL_BUTTON" = "Play all";
+"PLAY_ALL_HINT" = "Play all the medias in the collection";
 
 "RESET_VIDEO_FILTERS" = "Do you want to reset the video filters?";
 "RESET_PLAYBACK_SPEED" = "Do you want to reset the playback speed?";

Sources/MediaCategories/MediaCategory.swift

@@ -75,9 +75,28 @@ class ArtistAlbumCategoryViewController: MediaCategoryViewController {
 }
 
 class CollectionCategoryViewController: MediaCategoryViewController {
+    private lazy var playAllButton: UIBarButtonItem = {
+        let playAllButton = UIBarButtonItem(image: UIImage(named: "iconPlay"), style: .plain, target: self, action: #selector(handlePlayAll))
+        playAllButton.accessibilityLabel = NSLocalizedString("PLAY_ALL_BUTTON", comment: "")
+        playAllButton.accessibilityHint = NSLocalizedString("PLAY_ALL_HINT", comment: "")
+        return playAllButton
+    }()
+
     init(_ services: Services, mediaCollection: MediaCollectionModel) {
         let model = CollectionModel(mediaService: services.medialibraryService, mediaCollection: mediaCollection)
         super.init(services: services, model: model)
         model.observable.addObserver(self)
     }
+
+    func getPlayAllButton() -> UIBarButtonItem {
+        return playAllButton
+    }
+
+    @objc private func handlePlayAll() {
+        if let model = model as? CollectionModel,
+           let collection = model.mediaCollection as? VLCMLArtist {
+            let playbackService = PlaybackService.sharedInstance()
+            playbackService.playCollection(collection.tracks())
+        }
+    }
 }

Sources/MediaViewControllers/MediaViewController.swift

@@ -158,6 +158,12 @@ class MediaViewController: VLCPagingViewController<VLCLabelCell> {
             mediaCategoryViewController = viewController
         }
 
+        if navigationController?.viewControllers.last is ArtistViewController,
+           let viewController = viewControllers[currentIndex] as? CollectionCategoryViewController {
+            let playButton = viewController.getPlayAllButton()
+            rightBarButtons?.append(playButton)
+        }
+
         mediaCategoryViewController.navigationItem.leftBarButtonItems = showButtons ? leftBarButtons : nil
         mediaCategoryViewController.navigationItem.rightBarButtonItems = showButtons ? rightBarButtons : nil
     }