83dfa40299
本次提交围绕搜索链路的稳定性、定位恢复体验以及长章节内存优化的验证能力进行了补强。 主要改动： 1. 调整阅读器搜索栏、搜索协调器与定位恢复逻辑，改善搜索结果跳转、状态同步与相关 UI 行为。 2. 补充内存探针接入点与上下文记录，便于跟踪阅读过程中的内存占用变化。 3. 更新 RDURLReaderController、ReaderContext 与工具视图相关实现，使调试与观测链路更完整。 4. 新增 MemoryFootprintTests，并同步更新 DemoReaderState 与 SearchTests，用 UI 测试覆盖搜索与内存相关回归场景。
517 lines
21 KiB
Swift
517 lines
21 KiB
Swift
|
||
import UIKit
|
||
|
||
public final class RDURLReaderController: UIViewController {
|
||
private struct PendingDemoPageRequest {
|
||
let pageNumber: Int
|
||
let animated: Bool
|
||
var attemptCount: Int
|
||
}
|
||
|
||
private let bookURL: URL
|
||
|
||
private let epubConfiguration: RDEPUBReaderConfiguration
|
||
|
||
private var embeddedController: UIViewController?
|
||
private let demoStateLabel: UILabel = {
|
||
let label = UILabel()
|
||
label.accessibilityIdentifier = "demo.reader.state"
|
||
label.font = .systemFont(ofSize: 1)
|
||
label.textColor = .clear
|
||
label.alpha = 0.01
|
||
label.isAccessibilityElement = true
|
||
label.text = "reader=opening"
|
||
return label
|
||
}()
|
||
private var pendingDemoPageRequest: PendingDemoPageRequest?
|
||
private var isRetryingPendingDemoPage = false
|
||
private let maxPendingDemoPageAttempts = 24
|
||
private let pendingDemoPageRetryDelay: TimeInterval = 0.25
|
||
private var demoStateTimer: Timer?
|
||
private var lastEmittedDemoState = ""
|
||
private var pendingSearchKeyword: String?
|
||
private var externalLinkActivationCount = 0
|
||
private var lastActivatedExternalURL: URL?
|
||
private var lastReaderErrorDescription = "none"
|
||
|
||
public init(
|
||
bookURL: URL,
|
||
epubConfiguration: RDEPUBReaderConfiguration = RDEPUBReaderConfiguration()
|
||
) {
|
||
self.bookURL = bookURL
|
||
self.epubConfiguration = epubConfiguration
|
||
super.init(nibName: nil, bundle: nil)
|
||
}
|
||
|
||
@available(*, unavailable)
|
||
required init?(coder: NSCoder) {
|
||
fatalError("init(coder:) has not been implemented")
|
||
}
|
||
|
||
public override func viewDidLoad() {
|
||
super.viewDidLoad()
|
||
view.backgroundColor = .systemBackground
|
||
title = bookURL.deletingPathExtension().lastPathComponent
|
||
RDEPUBResourceURLSchemeHandler.resetDebugMetrics()
|
||
embedReaderController()
|
||
installDemoStateLabel()
|
||
}
|
||
|
||
public override func viewDidAppear(_ animated: Bool) {
|
||
super.viewDidAppear(animated)
|
||
startDemoStateTimerIfNeeded()
|
||
refreshDemoState()
|
||
}
|
||
|
||
public override func viewDidDisappear(_ animated: Bool) {
|
||
super.viewDidDisappear(animated)
|
||
stopDemoStateTimer()
|
||
}
|
||
|
||
deinit {
|
||
stopDemoStateTimer()
|
||
}
|
||
|
||
public func applyDemoDisplayType(_ displayType: RDReaderView.DisplayType) {
|
||
readerController?.configuration.displayType = displayType
|
||
emitDemoState(prefix: "display=\(displayType.demoArgumentValue)")
|
||
}
|
||
|
||
@discardableResult
|
||
public func goToDemoPage(_ pageNumber: Int, animated: Bool = false) -> Bool {
|
||
let moved = performDemoPageNavigation(pageNumber, animated: animated)
|
||
if moved {
|
||
pendingDemoPageRequest = nil
|
||
isRetryingPendingDemoPage = false
|
||
} else {
|
||
queuePendingDemoPageNavigation(pageNumber, animated: animated)
|
||
}
|
||
return moved
|
||
}
|
||
|
||
public func runDemoDisplaySequence(
|
||
_ displayTypes: [RDReaderView.DisplayType],
|
||
initialPageNumber: Int? = nil,
|
||
stepDelay: TimeInterval = 1.0
|
||
) {
|
||
let normalizedDelay = max(stepDelay, 0.1)
|
||
if let initialPageNumber {
|
||
DispatchQueue.main.asyncAfter(deadline: .now() + normalizedDelay) { [weak self] in
|
||
_ = self?.goToDemoPage(initialPageNumber)
|
||
}
|
||
}
|
||
|
||
for (index, displayType) in displayTypes.enumerated() {
|
||
let delay = normalizedDelay * Double(index + 1 + (initialPageNumber == nil ? 0 : 1))
|
||
DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak self] in
|
||
self?.applyDemoDisplayType(displayType)
|
||
}
|
||
}
|
||
}
|
||
|
||
public func performDemoSearch(keyword: String) {
|
||
guard let readerController else { return }
|
||
readerController.showSearchBar()
|
||
if readerController.parser != nil || readerController.textBook != nil {
|
||
submitSearchAfterDelay(keyword: keyword, retries: 10)
|
||
} else {
|
||
pendingSearchKeyword = keyword
|
||
}
|
||
}
|
||
|
||
private func submitSearchAfterDelay(keyword: String, retries: Int = 0) {
|
||
guard let readerController else { return }
|
||
DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) { [weak self] in
|
||
guard let self else { return }
|
||
readerController.search(keyword: keyword)
|
||
readerController.updateSearchCount()
|
||
// 按需加载的书打开初期搜索引擎可能尚未就绪（bookPageMap 未建立），
|
||
// 只要还没有命中就继续重试，交由搜索自身的 token 去重。
|
||
if retries > 0,
|
||
readerController.searchState?.matches.isEmpty != false {
|
||
self.submitSearchAfterDelay(keyword: keyword, retries: retries - 1)
|
||
}
|
||
}
|
||
}
|
||
|
||
private func executePendingSearchIfNeeded() {
|
||
guard let keyword = pendingSearchKeyword else { return }
|
||
guard let readerController, readerController.parser != nil || readerController.textBook != nil else {
|
||
return
|
||
}
|
||
pendingSearchKeyword = nil
|
||
submitSearchAfterDelay(keyword: keyword, retries: 10)
|
||
}
|
||
|
||
private func embedReaderController() {
|
||
let controller: UIViewController
|
||
if bookURL.pathExtension.lowercased() == "epub" {
|
||
controller = RDEPUBReaderController(
|
||
epubURL: bookURL,
|
||
configuration: epubConfiguration
|
||
)
|
||
} else {
|
||
let bookIdentifier = bookURL.lastPathComponent
|
||
let bookTitle = bookURL.deletingPathExtension().lastPathComponent
|
||
let pageSize = currentTextPageSize()
|
||
let renderStyle = currentTextRenderStyle()
|
||
let safeInsets = RDEPUBSafeArea.resolve(view.safeAreaInsets)
|
||
let edgeInsets = UIEdgeInsets(
|
||
top: max(epubConfiguration.reflowableContentInsets.top, safeInsets.top),
|
||
left: max(epubConfiguration.reflowableContentInsets.left, safeInsets.left),
|
||
bottom: max(epubConfiguration.reflowableContentInsets.bottom, safeInsets.bottom),
|
||
right: max(epubConfiguration.reflowableContentInsets.right, safeInsets.right)
|
||
)
|
||
let builder = RDPlainTextBookBuilder(
|
||
layoutConfig: RDEPUBTextLayoutConfig(
|
||
frameWidth: pageSize.width,
|
||
frameHeight: pageSize.height,
|
||
edgeInsets: edgeInsets,
|
||
numberOfColumns: 1,
|
||
columnGap: 20,
|
||
avoidOrphans: false,
|
||
avoidWidows: false,
|
||
avoidPageBreakInsideEnabled: true,
|
||
hyphenation: true,
|
||
imageMaxHeightRatio: 0.85
|
||
)
|
||
)
|
||
if let textBook = try? builder.build(textFileURL: bookURL, pageSize: pageSize, style: renderStyle) {
|
||
controller = RDEPUBReaderController(
|
||
textBook: textBook,
|
||
bookIdentifier: bookIdentifier,
|
||
title: bookTitle,
|
||
textFileURL: bookURL,
|
||
configuration: epubConfiguration
|
||
)
|
||
} else {
|
||
|
||
let fallback = UIViewController()
|
||
let textView = UITextView()
|
||
textView.isEditable = false
|
||
textView.text = rd_decodeTextFile(url: bookURL)
|
||
fallback.view = textView
|
||
controller = fallback
|
||
}
|
||
}
|
||
embeddedController = controller
|
||
addChild(controller)
|
||
controller.view.translatesAutoresizingMaskIntoConstraints = false
|
||
view.addSubview(controller.view)
|
||
NSLayoutConstraint.activate([
|
||
controller.view.topAnchor.constraint(equalTo: view.topAnchor),
|
||
controller.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
|
||
controller.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
|
||
controller.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
|
||
])
|
||
controller.didMove(toParent: self)
|
||
readerController?.delegate = self
|
||
emitDemoState()
|
||
}
|
||
|
||
private var readerController: RDEPUBReaderController? {
|
||
embeddedController as? RDEPUBReaderController
|
||
}
|
||
|
||
@discardableResult
|
||
private func performDemoPageNavigation(_ pageNumber: Int, animated: Bool) -> Bool {
|
||
guard let readerController else { return false }
|
||
guard pageNumber > 0 else { return false }
|
||
|
||
let knownPages = readerController.readerContext.bookPageMap?.totalPages
|
||
?? readerController.textBook?.pages.count
|
||
?? readerController.activePages.count
|
||
let numPages = readerController.readerView.numberOfPages()
|
||
let moved = readerController.go(toPageNumber: pageNumber, animated: animated)
|
||
if moved {
|
||
emitDemoState(prefix: "page=\(pageNumber)")
|
||
}
|
||
return moved
|
||
}
|
||
|
||
private func queuePendingDemoPageNavigation(_ pageNumber: Int, animated: Bool) {
|
||
if let pendingDemoPageRequest,
|
||
pendingDemoPageRequest.pageNumber == pageNumber,
|
||
pendingDemoPageRequest.animated == animated {
|
||
return
|
||
}
|
||
|
||
pendingDemoPageRequest = PendingDemoPageRequest(
|
||
pageNumber: pageNumber,
|
||
animated: animated,
|
||
attemptCount: 0
|
||
)
|
||
retryPendingDemoPageIfNeeded()
|
||
}
|
||
|
||
private func retryPendingDemoPageIfNeeded() {
|
||
guard !isRetryingPendingDemoPage else { return }
|
||
guard pendingDemoPageRequest != nil else { return }
|
||
|
||
isRetryingPendingDemoPage = true
|
||
DispatchQueue.main.asyncAfter(deadline: .now() + pendingDemoPageRetryDelay) { [weak self] in
|
||
self?.attemptPendingDemoPageNavigation()
|
||
}
|
||
}
|
||
|
||
private func attemptPendingDemoPageNavigation() {
|
||
guard var pendingDemoPageRequest else {
|
||
isRetryingPendingDemoPage = false
|
||
return
|
||
}
|
||
|
||
if performDemoPageNavigation(pendingDemoPageRequest.pageNumber, animated: pendingDemoPageRequest.animated) {
|
||
self.pendingDemoPageRequest = nil
|
||
isRetryingPendingDemoPage = false
|
||
return
|
||
}
|
||
|
||
pendingDemoPageRequest.attemptCount += 1
|
||
if pendingDemoPageRequest.attemptCount >= maxPendingDemoPageAttempts {
|
||
self.pendingDemoPageRequest = nil
|
||
isRetryingPendingDemoPage = false
|
||
return
|
||
}
|
||
|
||
self.pendingDemoPageRequest = pendingDemoPageRequest
|
||
DispatchQueue.main.asyncAfter(deadline: .now() + pendingDemoPageRetryDelay) { [weak self] in
|
||
self?.attemptPendingDemoPageNavigation()
|
||
}
|
||
}
|
||
|
||
private func logDemoState(prefix: String) {
|
||
guard let readerController else { return }
|
||
let location = readerController.currentLocation
|
||
let href = location?.href ?? "nil"
|
||
let progression = location.map { String(format: "%.4f", $0.navigationProgression) } ?? "nil"
|
||
let page = readerController.currentPageNumber.map(String.init) ?? "nil"
|
||
}
|
||
|
||
private func installDemoStateLabel() {
|
||
view.addSubview(demoStateLabel)
|
||
demoStateLabel.translatesAutoresizingMaskIntoConstraints = false
|
||
NSLayoutConstraint.activate([
|
||
demoStateLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor),
|
||
demoStateLabel.topAnchor.constraint(equalTo: view.topAnchor),
|
||
demoStateLabel.widthAnchor.constraint(equalToConstant: 1),
|
||
demoStateLabel.heightAnchor.constraint(equalToConstant: 1)
|
||
])
|
||
}
|
||
|
||
private func startDemoStateTimerIfNeeded() {
|
||
guard demoStateTimer == nil else { return }
|
||
demoStateTimer = Timer.scheduledTimer(withTimeInterval: 0.5, repeats: true) { [weak self] _ in
|
||
self?.refreshDemoState(logIfChanged: false)
|
||
}
|
||
if let demoStateTimer {
|
||
RunLoop.main.add(demoStateTimer, forMode: .common)
|
||
}
|
||
}
|
||
|
||
private func stopDemoStateTimer() {
|
||
demoStateTimer?.invalidate()
|
||
demoStateTimer = nil
|
||
}
|
||
|
||
private func emitDemoState(prefix: String? = nil) {
|
||
refreshDemoState(logPrefix: prefix, logIfChanged: true)
|
||
}
|
||
|
||
private func refreshDemoState(logPrefix: String? = nil, logIfChanged: Bool = true) {
|
||
let page = readerController?.currentPageNumber.map(String.init) ?? "nil"
|
||
let display = readerController?.configuration.displayType.demoArgumentValue ?? epubConfiguration.displayType.demoArgumentValue
|
||
let toolbar = readerController?.readerView.isShowToolView == true ? "visible" : "hidden"
|
||
let highlights = readerController?.highlights.count ?? 0
|
||
let bookmarks = readerController?.activeBookmarks.count ?? 0
|
||
let selection = readerController?.currentSelection == nil ? 0 : 1
|
||
let location = readerController?.currentLocation
|
||
let href = encodedDemoLocationHref(location?.href)
|
||
let progression = location.map { String(format: "%.4f", $0.navigationProgression) } ?? "nil"
|
||
let cfi = encodedDemoField(location?.cfi)
|
||
let lastCFI = encodedDemoField(location?.lastCFI)
|
||
let rangeCFI = encodedDemoField(location?.rangeCFI)
|
||
let mapSnapshot = demoPaginationSnapshot()
|
||
let layoutConfig = readerController?.readerContext.currentTextLayoutConfig(pageSize: currentTextPageSize())
|
||
let resourceMetrics = RDEPUBResourceURLSchemeHandler.debugMetricsSnapshot()
|
||
let cacheStats = readerController?.readerContext.makeChapterSummaryDiskCache().cacheStatistics
|
||
?? (fileCount: 0, totalBytes: 0)
|
||
let inspectable = readerController?.configuration.allowsInspectableWebViews ?? epubConfiguration.allowsInspectableWebViews
|
||
let state = [
|
||
"reader=opened",
|
||
"page=\(page)",
|
||
"display=\(display)",
|
||
"toolbar=\(toolbar)",
|
||
"highlights=\(highlights)",
|
||
"bookmarks=\(bookmarks)",
|
||
"selection=\(selection)",
|
||
"href=\(href)",
|
||
"progression=\(progression)",
|
||
"cfi=\(cfi)",
|
||
"lastCFI=\(lastCFI)",
|
||
"rangeCFI=\(rangeCFI)",
|
||
"mode=\(mapSnapshot.mode)",
|
||
"pagination=\(mapSnapshot.phase)",
|
||
"knownPages=\(mapSnapshot.knownPages)",
|
||
"knownChapters=\(mapSnapshot.knownChapters)",
|
||
"buildableChapters=\(mapSnapshot.buildableChapters)",
|
||
"avoidWidows=\(layoutConfig?.avoidWidows == true ? 1 : 0)",
|
||
"avoidOrphans=\(layoutConfig?.avoidOrphans == true ? 1 : 0)",
|
||
"windowSize=\(readerController?.configuration.onDemandChapterWindowSize ?? epubConfiguration.onDemandChapterWindowSize)",
|
||
"parseMs=\(readerController?.readerContext.lastMetadataParseWallClockMs ?? 0)",
|
||
"parseConcurrency=\(readerController?.readerContext.lastMetadataParseConcurrency ?? 0)",
|
||
"inspectable=\(inspectable ? 1 : 0)",
|
||
"streamedResources=\(resourceMetrics.streamedResponses)",
|
||
"inMemoryResources=\(resourceMetrics.inMemoryResponses)",
|
||
"resourceFailures=\(resourceMetrics.failures)",
|
||
"cacheFiles=\(cacheStats.fileCount)",
|
||
"cacheBytes=\(cacheStats.totalBytes)",
|
||
"externalLinks=\(externalLinkActivationCount)",
|
||
"lastExternalURL=\(encodedDemoLocationHref(lastActivatedExternalURL?.absoluteString))",
|
||
"lastError=\(encodedDemoField(lastReaderErrorDescription))",
|
||
"searchMatchText=\(encodedDemoField(currentSearchMatchText()))",
|
||
"footprintMB=\(String(format: "%.1f", RDEPUBMemoryProbe.footprintMB))"
|
||
].joined(separator: " ")
|
||
demoStateLabel.text = state
|
||
if let logPrefix {
|
||
logDemoState(prefix: logPrefix)
|
||
} else if logIfChanged, state != lastEmittedDemoState {
|
||
}
|
||
lastEmittedDemoState = state
|
||
}
|
||
|
||
private func encodedDemoLocationHref(_ href: String?) -> String {
|
||
guard let href, !href.isEmpty else { return "nil" }
|
||
return href.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed) ?? href.replacingOccurrences(of: " ", with: "%20")
|
||
}
|
||
|
||
private func encodedDemoField(_ value: String?) -> String {
|
||
guard let value, !value.isEmpty else { return "nil" }
|
||
return value.addingPercentEncoding(withAllowedCharacters: .alphanumerics) ?? value.replacingOccurrences(of: " ", with: "_")
|
||
}
|
||
|
||
private func currentSearchMatchText() -> String {
|
||
guard let match = readerController?.searchState?.currentMatch else {
|
||
return "none"
|
||
}
|
||
// Primary path: extract the exact matched text from the chapter content
|
||
if let rangeLocation = match.rangeLocation,
|
||
let chapterData = readerController?.textChapterData(forNormalizedHref: match.href) {
|
||
let nsRange = NSRange(location: rangeLocation, length: match.rangeLength)
|
||
if nsRange.location >= 0,
|
||
nsRange.location + nsRange.length <= chapterData.attributedContent.length {
|
||
return chapterData.attributedContent.attributedSubstring(from: nsRange).string
|
||
}
|
||
}
|
||
// Fallback: chapter data may not be cached yet (on-demand loading).
|
||
// If the match length equals the keyword length, the keyword itself
|
||
// is the match text. Otherwise extract from previewText at the known offset.
|
||
if let keyword = readerController?.searchState?.keyword,
|
||
match.rangeLength == keyword.count {
|
||
return keyword
|
||
}
|
||
// Final fallback: return "none" to indicate data not yet available
|
||
return "none"
|
||
}
|
||
|
||
private func demoPaginationSnapshot() -> (mode: String, phase: String, knownPages: Int, knownChapters: Int, buildableChapters: Int) {
|
||
guard let readerController else {
|
||
return ("unavailable", "none", 0, 0, 0)
|
||
}
|
||
|
||
if let bookPageMap = readerController.readerContext.bookPageMap {
|
||
let buildableChapters = readerController.publication?.spine.filter {
|
||
$0.linear && ($0.mediaType.contains("html") || $0.mediaType.contains("xhtml"))
|
||
}.count ?? 0
|
||
let phase = buildableChapters > 0 && bookPageMap.totalChapters >= buildableChapters ? "full" : "partial"
|
||
return ("bookPageMap", phase, bookPageMap.totalPages, bookPageMap.totalChapters, buildableChapters)
|
||
}
|
||
|
||
if let textBook = readerController.textBook {
|
||
return ("textBook", "full", textBook.pages.count, textBook.chapters.count, textBook.chapters.count)
|
||
}
|
||
|
||
let snapshotChapters = readerController.activeChapters.count
|
||
let snapshotPages = readerController.activePages.count
|
||
return ("snapshot", snapshotPages > 0 ? "full" : "none", snapshotPages, snapshotChapters, snapshotChapters)
|
||
}
|
||
|
||
private func currentTextPageSize() -> CGSize {
|
||
UIScreen.main.bounds.size
|
||
}
|
||
|
||
private func currentTextRenderStyle() -> RDEPUBTextRenderStyle {
|
||
let font = epubConfiguration.fontChoice.font(ofSize: epubConfiguration.fontSize)
|
||
let lineSpacing = max(font.lineHeight * (epubConfiguration.lineHeightMultiple - 1), 4)
|
||
return RDEPUBTextRenderStyle(
|
||
font: font,
|
||
lineSpacing: lineSpacing,
|
||
textColor: epubConfiguration.theme.contentTextColor,
|
||
backgroundColor: epubConfiguration.theme.contentBackgroundColor
|
||
)
|
||
}
|
||
|
||
private func rd_decodeTextFile(url: URL) -> String {
|
||
if let content = try? NSString(contentsOf: url, encoding: String.Encoding.utf8.rawValue) as String {
|
||
return content
|
||
}
|
||
if let content = try? NSString(contentsOf: url, encoding: 0x80000632) as String {
|
||
return content
|
||
}
|
||
if let content = try? NSString(contentsOf: url, encoding: 0x80000631) as String {
|
||
return content
|
||
}
|
||
return ""
|
||
}
|
||
}
|
||
|
||
extension RDURLReaderController: RDEPUBReaderDelegate {
|
||
public func epubReader(_ reader: UIViewController, didOpen publication: RDEPUBPublication) {
|
||
retryPendingDemoPageIfNeeded()
|
||
executePendingSearchIfNeeded()
|
||
emitDemoState()
|
||
}
|
||
|
||
public func epubReader(_ reader: UIViewController, didUpdateLocation location: RDEPUBLocation) {
|
||
retryPendingDemoPageIfNeeded()
|
||
executePendingSearchIfNeeded()
|
||
emitDemoState()
|
||
}
|
||
|
||
public func epubReader(_ reader: UIViewController, didChangeSelection selection: RDEPUBSelection?) {
|
||
emitDemoState(prefix: "selection=\(selection == nil ? 0 : 1)")
|
||
}
|
||
|
||
public func epubReader(_ reader: UIViewController, didUpdateHighlights highlights: [RDEPUBHighlight]) {
|
||
emitDemoState(prefix: "highlights=\(highlights.count)")
|
||
}
|
||
|
||
public func epubReader(_ reader: UIViewController, didUpdateBookmarks bookmarks: [RDEPUBBookmark]) {
|
||
emitDemoState(prefix: "bookmarks=\(bookmarks.count)")
|
||
}
|
||
|
||
public func epubReader(_ reader: UIViewController, didActivateExternalLink url: URL) {
|
||
externalLinkActivationCount += 1
|
||
lastActivatedExternalURL = url
|
||
emitDemoState(prefix: "externalLinks=\(externalLinkActivationCount)")
|
||
}
|
||
|
||
public func epubReader(_ reader: UIViewController, didFailWithError error: Error) {
|
||
lastReaderErrorDescription = String(describing: error)
|
||
emitDemoState(prefix: "lastError=\(lastReaderErrorDescription)")
|
||
}
|
||
}
|
||
|
||
private extension RDReaderView.DisplayType {
|
||
|
||
var demoArgumentValue: String {
|
||
switch self {
|
||
case .pageCurl:
|
||
return "pageCurl"
|
||
case .horizontalScroll:
|
||
return "horizontalScroll"
|
||
case .verticalScroll:
|
||
return "verticalScroll"
|
||
}
|
||
}
|
||
}
|