196 lines
6.9 KiB
Swift
196 lines
6.9 KiB
Swift
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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import Foundation
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@objc(OWSMediaGalleryCellView)
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public class MediaGalleryCellView: UIStackView {
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private let items: [ConversationMediaGalleryItem]
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private let itemViews: [ConversationMediaView]
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private static let kSpacingPts: CGFloat = 2
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private static let kMaxItems = 5
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@objc
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public required init(mediaCache: NSCache<NSString, AnyObject>,
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items: [ConversationMediaGalleryItem],
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maxMessageWidth: CGFloat) {
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self.items = items
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self.itemViews = MediaGalleryCellView.itemsToDisplay(forItems: items).map {
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ConversationMediaView(mediaCache: mediaCache,
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attachment: $0.attachment)
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}
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super.init(frame: .zero)
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self.backgroundColor = .white
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createContents(maxMessageWidth: maxMessageWidth)
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}
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private func createContents(maxMessageWidth: CGFloat) {
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switch itemViews.count {
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case 0:
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return
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case 1:
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guard let itemView = itemViews.first else {
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owsFailDebug("Missing item view.")
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return
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}
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addSubview(itemView)
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itemView.autoPinEdgesToSuperviewEdges()
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case 4:
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// Square
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let imageSize = (maxMessageWidth - MediaGalleryCellView.kSpacingPts) / 2
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let topViews = Array(itemViews[0..<2])
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addArrangedSubview(newRow(rowViews: topViews,
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axis: .horizontal,
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viewSize: imageSize))
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let bottomViews = Array(itemViews[2..<4])
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addArrangedSubview(newRow(rowViews: bottomViews,
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axis: .horizontal,
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viewSize: imageSize))
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self.axis = .vertical
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self.spacing = MediaGalleryCellView.kSpacingPts
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case 2:
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// X X
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// side-by-side.
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let imageSize = (maxMessageWidth - MediaGalleryCellView.kSpacingPts) / 2
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autoSet(viewSize: imageSize, ofViews: itemViews)
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for itemView in itemViews {
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addArrangedSubview(itemView)
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}
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self.axis = .horizontal
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self.spacing = MediaGalleryCellView.kSpacingPts
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case 3:
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// x
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// X
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// x
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// Big on left, 2 small on right.
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let smallImageSize = (maxMessageWidth - MediaGalleryCellView.kSpacingPts * 2) / 3
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let bigImageSize = smallImageSize * 2 + MediaGalleryCellView.kSpacingPts
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guard let leftItemView = itemViews.first else {
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owsFailDebug("Missing view")
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return
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}
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autoSet(viewSize: bigImageSize, ofViews: [leftItemView])
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addArrangedSubview(leftItemView)
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let rightViews = Array(itemViews[1..<3])
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addArrangedSubview(newRow(rowViews: rightViews,
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axis: .vertical,
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viewSize: smallImageSize))
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self.axis = .horizontal
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self.spacing = MediaGalleryCellView.kSpacingPts
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default:
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// X X
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// xxx
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// 2 big on top, 3 small on bottom.
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let bigImageSize = (maxMessageWidth - MediaGalleryCellView.kSpacingPts) / 2
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let smallImageSize = (maxMessageWidth - MediaGalleryCellView.kSpacingPts * 2) / 3
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let topViews = Array(itemViews[0..<2])
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addArrangedSubview(newRow(rowViews: topViews,
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axis: .horizontal,
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viewSize: bigImageSize))
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let bottomViews = Array(itemViews[2..<5])
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addArrangedSubview(newRow(rowViews: bottomViews,
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axis: .horizontal,
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viewSize: smallImageSize))
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self.axis = .vertical
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self.spacing = MediaGalleryCellView.kSpacingPts
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}
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}
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private func autoSet(viewSize: CGFloat,
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ofViews views: [ConversationMediaView]
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) {
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for itemView in views {
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itemView.autoSetDimensions(to: CGSize(width: viewSize, height: viewSize))
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}
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}
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private func newRow(rowViews: [ConversationMediaView],
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axis: NSLayoutConstraint.Axis,
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viewSize: CGFloat) -> UIStackView {
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autoSet(viewSize: viewSize, ofViews: rowViews)
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return newRow(rowViews: rowViews, axis: axis)
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}
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private func newRow(rowViews: [ConversationMediaView],
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axis: NSLayoutConstraint.Axis) -> UIStackView {
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let stackView = UIStackView(arrangedSubviews: rowViews)
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stackView.axis = axis
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stackView.spacing = MediaGalleryCellView.kSpacingPts
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return stackView
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}
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@objc
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public func loadMedia() {
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for itemView in itemViews {
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itemView.loadMedia()
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}
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}
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@objc
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public func unloadMedia() {
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for itemView in itemViews {
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itemView.unloadMedia()
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}
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}
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@available(*, unavailable, message: "use other init() instead.")
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required public init(coder aDecoder: NSCoder) {
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notImplemented()
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}
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private class func itemsToDisplay(forItems items: [ConversationMediaGalleryItem]) -> [ConversationMediaGalleryItem] {
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let validItems = items.filter {
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$0.attachmentStream != nil
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}
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guard validItems.count < kMaxItems else {
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return Array(validItems[0..<kMaxItems])
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}
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return validItems
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}
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@objc
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public class func layoutSize(forMaxMessageWidth maxMessageWidth: CGFloat,
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items: [ConversationMediaGalleryItem]) -> CGSize {
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let itemCount = itemsToDisplay(forItems: items).count
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switch itemCount {
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case 0, 1, 4:
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// Square
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return CGSize(width: maxMessageWidth, height: maxMessageWidth)
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case 2:
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// X X
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// side-by-side.
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let imageSize = (maxMessageWidth - kSpacingPts) / 2
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return CGSize(width: maxMessageWidth, height: imageSize)
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case 3:
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// x
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// X
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// x
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// Big on left, 2 small on right.
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let smallImageSize = (maxMessageWidth - kSpacingPts * 2) / 3
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let bigImageSize = smallImageSize * 2 + kSpacingPts
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return CGSize(width: maxMessageWidth, height: bigImageSize)
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default:
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// X X
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// xxx
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// 2 big on top, 3 small on bottom.
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let bigImageSize = (maxMessageWidth - kSpacingPts) / 2
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let smallImageSize = (maxMessageWidth - kSpacingPts * 2) / 3
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return CGSize(width: maxMessageWidth, height: bigImageSize + smallImageSize + kSpacingPts)
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}
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}
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}
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