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@@ -12,6 +12,7 @@ class GalleryViewController: UIViewController {
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private let mediaMessageIds: [Int]
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private var gridSections: [GallerySection] = []
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+ // MARK: - subview specs
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private lazy var gridLayout: GridCollectionViewFlowLayout = {
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let layout = GridCollectionViewFlowLayout()
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layout.minimumLineSpacing = 10
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@@ -20,7 +21,6 @@ class GalleryViewController: UIViewController {
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return layout
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}()
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- // MARK: - subview specs
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private lazy var grid: UICollectionView = {
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let collection = UICollectionView(frame: .zero, collectionViewLayout: gridLayout)
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collection.dataSource = self
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@@ -36,7 +36,6 @@ class GalleryViewController: UIViewController {
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return collection
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}()
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- // MARK: - specs
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private let gridInsets: CGFloat = 10
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init(mediaMessageIds: [Int]) {
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@@ -114,24 +113,29 @@ extension GalleryViewController: UICollectionViewDataSource, UICollectionViewDel
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return UICollectionReusableView()
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}
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+ func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
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+ let msgId = gridSections[indexPath.section].msgIds[indexPath.row]
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+ showPreview(msgId: msgId)
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+ }
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+
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func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
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return CGSize(width: collectionView.frame.width - 2 * gridInsets, height: 32)
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}
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}
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+// MARK: - update layout
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extension GalleryViewController {
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private func reloadCollectionViewLayout() {
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// columns specification
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let phonePortrait = 2
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let phoneLandscape = 3
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- let padPortrait = 3
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- let padLandscape = 5
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+ let padPortrait = 4
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+ let padLandscape = 6
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let orientation = UIDevice.current.orientation
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let deviceType = UIDevice.current.userInterfaceIdiom
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-
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var gridDisplay: GridDisplay?
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if deviceType == .phone {
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if orientation.isPortrait {
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@@ -155,7 +159,23 @@ extension GalleryViewController {
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let containerWidth = view.bounds.width - view.safeAreaInsets.left - view.safeAreaInsets.right - 2 * gridInsets
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gridLayout.containerWidth = containerWidth
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}
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- }
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+}
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+
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+// MARK: - coordinator
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+extension GalleryViewController {
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+ func showPreview(msgId: Int) {
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+ let msg = DcMsg(id: msgId)
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+ guard let url = msg.fileURL, let index = mediaMessageIds.index(of: msgId) else {
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+ return
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+ }
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+ let previousUrls: [URL] = msg.previousMediaURLs()
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+ let nextUrls: [URL] = msg.nextMediaURLs()
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+ // these are the files user will be able to swipe trough
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+ let mediaUrls: [URL] = previousUrls + [url] + nextUrls
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+ let previewController = PreviewController(currentIndex: index, urls: mediaUrls)
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+ present(previewController, animated: true, completion: nil)
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+ }
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+}
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enum GridDisplay {
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@@ -184,64 +204,3 @@ extension GridDisplay: Equatable {
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}
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}
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-class GridCollectionViewFlowLayout: UICollectionViewFlowLayout {
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-
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- var display: GridDisplay = .list {
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- didSet {
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- if display != oldValue {
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- self.invalidateLayout()
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- }
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- }
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- }
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-
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- var containerWidth: CGFloat = 0.0 {
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- didSet {
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- if containerWidth != oldValue {
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- self.invalidateLayout()
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- }
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- }
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- }
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-
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- var format: GridItemFormat = .square {
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- didSet {
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- self.invalidateLayout()
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- }
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- }
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-
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- convenience init(display: GridDisplay, containerWidth: CGFloat, format: GridItemFormat) {
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- self.init()
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- self.display = display
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- self.containerWidth = containerWidth
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- self.format = format
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- self.configLayout()
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- }
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-
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- private func configLayout() {
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- switch display {
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- case .grid(let column):
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- self.scrollDirection = .vertical
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- let spacing = CGFloat(column - 1) * minimumLineSpacing
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- let optimisedWidth = (containerWidth - spacing) / CGFloat(column)
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- let height = calculateHeight(width: optimisedWidth)
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- self.itemSize = CGSize(width: optimisedWidth, height: height) // keep as square
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- case .list:
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- self.scrollDirection = .vertical
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- let height = calculateHeight(width: containerWidth)
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- self.itemSize = CGSize(width: containerWidth, height: height)
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- }
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- }
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-
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- private func calculateHeight(width: CGFloat) -> CGFloat {
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- switch format {
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- case .square:
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- return width
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- case .rect(let ratio):
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- return width * ratio
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- }
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- }
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-
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- override func invalidateLayout() {
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- super.invalidateLayout()
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- self.configLayout()
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- }
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-}
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nayooti