645 lines
25 KiB
Swift
645 lines
25 KiB
Swift
import UIKit
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import Foundation
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#if canImport(DTCoreText)
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import DTCoreText
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#endif
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// MARK: - 文本内容视图代理
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protocol RDEPUBTextContentViewDelegate: AnyObject {
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func textContentView(_ contentView: RDEPUBTextContentView, didChangeSelection selection: RDEPUBSelection?)
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func textContentView(
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_ contentView: RDEPUBTextContentView,
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didRequestSelectionAction action: RDEPUBAnnotationMenuAction,
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selection: RDEPUBSelection?
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)
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func textContentView(
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_ contentView: RDEPUBTextContentView,
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didRequestHighlightActions highlight: RDEPUBHighlight,
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sourceRect: CGRect
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)
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}
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// MARK: - 文本内容视图
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/// EPUB 流式排版的文本内容视图
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/// 对齐 WXRead 架构：选区和高亮共享 CoreText 命中测试与 drawRect 绘制结果。
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final class RDEPUBTextContentView: UIView, UIGestureRecognizerDelegate {
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private static let darkAdjustedImageCache = NSCache<NSString, UIImage>()
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private var contentInsets: UIEdgeInsets = .zero
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private var currentPage: RDEPUBTextPage?
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private var currentSelection: RDEPUBSelection?
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private var menuSelection: RDEPUBSelection?
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private var currentHighlights: [RDEPUBHighlight] = []
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weak var delegate: RDEPUBTextContentViewDelegate?
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#if canImport(DTCoreText)
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private let coreTextContentView: RDEPUBTextPageRenderView = {
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let view = RDEPUBTextPageRenderView()
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view.backgroundColor = .clear
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view.isOpaque = false
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return view
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}()
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private var coreTextDisplayContent: NSAttributedString?
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private var coreTextDisplayRange: NSRange?
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#endif
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private let interactionController = RDEPUBPageInteractionController()
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private let selectionController = RDEPUBTextSelectionController()
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private let backgroundOverlayView: RDEPUBTextPageDecorationView = {
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let view = RDEPUBTextPageDecorationView()
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return view
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}()
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private let overlayView: RDEPUBTextAnnotationOverlay = {
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let view = RDEPUBTextAnnotationOverlay()
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return view
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}()
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private let coverImageView: UIImageView = {
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let view = UIImageView()
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view.contentMode = .scaleAspectFit
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view.isHidden = true
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return view
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}()
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private let pageNumberLabel: UILabel = {
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let label = UILabel()
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label.font = UIFont.systemFont(ofSize: 13)
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return label
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}()
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private lazy var longPressGestureRecognizer: UILongPressGestureRecognizer = {
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let gesture = UILongPressGestureRecognizer(target: self, action: #selector(handleLongPress(_:)))
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gesture.minimumPressDuration = 0.5
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gesture.delegate = self
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return gesture
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}()
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private lazy var panGestureRecognizer: UIPanGestureRecognizer = {
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let gesture = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
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gesture.isEnabled = false
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gesture.delegate = self
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return gesture
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}()
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private lazy var tapGestureRecognizer: UITapGestureRecognizer = {
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let gesture = UITapGestureRecognizer(target: self, action: #selector(handleTap(_:)))
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gesture.delegate = self
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return gesture
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}()
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// MARK: - Init
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override init(frame: CGRect) {
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super.init(frame: frame)
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accessibilityIdentifier = "epub.reader.content.view"
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addSubview(coverImageView)
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#if canImport(DTCoreText)
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addSubview(backgroundOverlayView)
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addSubview(coreTextContentView)
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#endif
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addSubview(overlayView)
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addSubview(pageNumberLabel)
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addGestureRecognizer(longPressGestureRecognizer)
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addGestureRecognizer(panGestureRecognizer)
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addGestureRecognizer(tapGestureRecognizer)
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tapGestureRecognizer.require(toFail: longPressGestureRecognizer)
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selectionController.onSelectionChanged = { [weak self] selection in
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guard let self else { return }
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self.currentSelection = selection
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if let selection {
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self.menuSelection = selection
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} else {
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self.hideSelectionMenu()
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}
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self.delegate?.textContentView(self, didChangeSelection: selection)
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}
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selectionController.pageProvider = { [weak self] in self?.currentPage }
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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// MARK: - First Responder
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override var canBecomeFirstResponder: Bool { true }
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override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
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action == #selector(rd_copy(_:))
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|| action == #selector(rd_highlight(_:))
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|| action == #selector(rd_annotate(_:))
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}
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@objc func rd_copy(_ sender: Any?) {
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performSelectionAction(.copy)
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}
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@objc func rd_highlight(_ sender: Any?) {
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performSelectionAction(.highlight)
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}
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@objc func rd_annotate(_ sender: Any?) {
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performSelectionAction(.annotate)
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}
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// MARK: - Layout
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override func layoutSubviews() {
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super.layoutSubviews()
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#if canImport(DTCoreText)
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backgroundOverlayView.frame = bounds.inset(by: contentInsets)
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coreTextContentView.frame = bounds.inset(by: contentInsets)
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updateCoreTextLayoutFrameIfNeeded()
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#endif
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overlayView.frame = bounds.inset(by: contentInsets)
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coverImageView.frame = bounds.inset(by: contentInsets)
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let labelSize = pageNumberLabel.sizeThatFits(CGSize(width: bounds.width, height: 20))
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pageNumberLabel.frame = CGRect(
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x: bounds.width - labelSize.width - 24,
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y: bounds.height - labelSize.height - 20,
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width: labelSize.width,
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height: labelSize.height
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)
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}
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// MARK: - Configure
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func configure(
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page: RDEPUBTextPage,
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pageNumber: Int,
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totalPages: Int,
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configuration: RDEPUBReaderConfiguration,
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highlights: [RDEPUBHighlight] = [],
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searchState: RDEPUBSearchState? = nil
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) {
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currentPage = page
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currentSelection = nil
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menuSelection = nil
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currentHighlights = highlights
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selectionController.clearSelection(renderView: coreTextRenderView)
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contentInsets = configuration.reflowableContentInsets
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backgroundColor = configuration.theme.contentBackgroundColor
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pageNumberLabel.textColor = configuration.theme.contentTextColor
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pageNumberLabel.text = "\(pageNumber) / \(totalPages)"
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if configureCoverIfNeeded(for: page) {
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#if canImport(DTCoreText)
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coreTextContentView.isHidden = true
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coreTextContentView.layoutFrame = nil
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coreTextDisplayContent = nil
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coreTextDisplayRange = nil
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#endif
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delegate?.textContentView(self, didChangeSelection: nil)
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setNeedsLayout()
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return
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}
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coverImageView.isHidden = true
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coverImageView.image = nil
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#if canImport(DTCoreText)
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let displayContent = darkImageAdjustedContentIfNeeded(
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normalizedPageContent(from: page),
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configuration: configuration
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)
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let fullRange = NSRange(location: 0, length: displayContent.length)
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displayContent.addAttribute(
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.foregroundColor,
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value: configuration.theme.contentTextColor,
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range: fullRange
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)
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// 注入高亮/下划线自定义属性（对齐 WXRead 的 WRChapterData.addHighlightInRange:）
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applyHighlightsToContent(displayContent, highlights: highlights, page: page)
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coreTextContentView.isHidden = false
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coreTextContentView.backgroundColor = .clear
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coreTextContentView.accessibilityIdentifier = "epub.reader.selection.text"
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coreTextDisplayContent = displayContent
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coreTextDisplayRange = NSRange(location: 0, length: displayContent.length)
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coreTextContentView.attributedDisplayContent = displayContent
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updateCoreTextLayoutFrameIfNeeded()
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#else
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let selectionContent = normalizedPageContent(from: page)
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let selectionRange = NSRange(location: 0, length: selectionContent.length)
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selectionContent.addAttribute(
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.foregroundColor,
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value: configuration.theme.contentTextColor,
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range: selectionRange
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)
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overlayView.applyHighlights(highlights, to: selectionContent, page: page, contentBaseOffset: page.pageStartOffset)
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overlayView.applySearchHighlights(to: selectionContent, page: page, searchState: searchState, contentBaseOffset: page.pageStartOffset)
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#endif
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overlayView.configure(page: page, selectionColor: overlayView.selectionColor, snapshot: interactionController.snapshot)
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#if canImport(DTCoreText)
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backgroundOverlayView.configure(page: page, selectionColor: overlayView.selectionColor, snapshot: interactionController.snapshot)
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let (bgDecorations, fgDecorations) = overlayView.buildDecorations(
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page: page,
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highlights: [],
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searchState: searchState,
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interactionController: interactionController
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)
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backgroundOverlayView.applyDecorations(bgDecorations)
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overlayView.applyDecorations(fgDecorations)
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#endif
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delegate?.textContentView(self, didChangeSelection: nil)
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setNeedsLayout()
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}
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func clearSelection() {
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currentSelection = nil
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menuSelection = nil
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panGestureRecognizer.isEnabled = false
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selectionController.clearSelection(renderView: coreTextRenderView)
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overlayView.clearSelection()
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backgroundOverlayView.clearSelection()
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UIMenuController.shared.setMenuVisible(false, animated: true)
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}
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// MARK: - 选择操作
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private func performSelectionAction(_ action: RDEPUBAnnotationMenuAction) {
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let selection = currentSelection ?? menuSelection
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delegate?.textContentView(self, didRequestSelectionAction: action, selection: selection)
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menuSelection = nil
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hideSelectionMenu()
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}
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// MARK: - Cover Image
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private func configureCoverIfNeeded(for page: RDEPUBTextPage) -> Bool {
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guard page.pageIndexInChapter == 0,
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page.href.lowercased().contains("cover"),
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let image = coverImage(from: page.content) else {
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return false
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}
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coverImageView.image = image
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coverImageView.isHidden = false
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#if canImport(DTCoreText)
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coreTextContentView.isHidden = true
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coreTextContentView.layoutFrame = nil
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coreTextDisplayContent = nil
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coreTextDisplayRange = nil
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#endif
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return true
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}
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private func coverImage(from content: NSAttributedString) -> UIImage? {
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guard content.length > 0 else { return nil }
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var resolvedImage: UIImage?
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content.enumerateAttribute(.attachment, in: NSRange(location: 0, length: content.length)) { value, _, stop in
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guard let image = image(from: value) else { return }
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resolvedImage = image
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stop.pointee = true
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}
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return resolvedImage
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}
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private func image(from attachmentValue: Any?) -> UIImage? {
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#if canImport(DTCoreText)
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if let attachment = attachmentValue as? DTTextAttachment,
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let url = attachment.contentURL {
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return UIImage(contentsOfFile: url.path)
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}
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#endif
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if let attachment = attachmentValue as? NSTextAttachment {
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if let image = attachment.image { return image }
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if let data = attachment.contents { return UIImage(data: data) }
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if let fileWrapper = attachment.fileWrapper,
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let data = fileWrapper.regularFileContents { return UIImage(data: data) }
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}
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return nil
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}
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// MARK: - Dark Image Adjustment
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#if canImport(DTCoreText)
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private func darkImageAdjustedContentIfNeeded(
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_ content: NSMutableAttributedString,
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configuration: RDEPUBReaderConfiguration
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) -> NSMutableAttributedString {
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guard configuration.darkImageAdjustmentEnabled,
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configuration.darkImageBlendRatio > 0,
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configuration.theme.contentBackgroundColor.rd_isDarkReaderBackground else {
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return content
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}
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let fullRange = NSRange(location: 0, length: content.length)
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content.enumerateAttribute(.attachment, in: fullRange) { value, range, _ in
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guard let attachment = value as? DTImageTextAttachment,
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!isCoverAttachment(attachment),
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let image = attachment.image,
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shouldAdjustDarkImage(image) else { return }
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let adjustedAttachment = DTImageTextAttachment()
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adjustedAttachment.image = adjustedImage(
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image,
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backgroundColor: configuration.theme.contentBackgroundColor,
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blendRatio: configuration.darkImageBlendRatio,
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cacheKey: darkImageCacheKey(for: attachment, image: image, configuration: configuration)
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)
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adjustedAttachment.originalSize = attachment.originalSize
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adjustedAttachment.displaySize = attachment.displaySize
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adjustedAttachment.verticalAlignment = attachment.verticalAlignment
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adjustedAttachment.contentURL = attachment.contentURL
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adjustedAttachment.hyperLinkURL = attachment.hyperLinkURL
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adjustedAttachment.hyperLinkGUID = attachment.hyperLinkGUID
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adjustedAttachment.attributes = attachment.attributes
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content.addAttribute(.attachment, value: adjustedAttachment, range: range)
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}
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return content
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}
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private func isCoverAttachment(_ attachment: DTTextAttachment) -> Bool {
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let lowercasedClasses = ((attachment.attributes["class"] as? String) ?? "").lowercased()
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let lowercasedPath = attachment.contentURL?.lastPathComponent.lowercased()
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?? ((attachment.attributes["src"] as? String) ?? "").lowercased()
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return lowercasedClasses.contains("rd-front-cover-image") || lowercasedPath.contains("cover")
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}
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private func shouldAdjustDarkImage(_ image: UIImage) -> Bool {
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image.size.width >= 80 && image.size.height >= 80
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}
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private func darkImageCacheKey(
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for attachment: DTImageTextAttachment,
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image: UIImage,
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configuration: RDEPUBReaderConfiguration
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) -> NSString {
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let source = attachment.contentURL?.absoluteString
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?? "\(Unmanaged.passUnretained(image).toOpaque())"
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return "\(source)|\(image.size.width)x\(image.size.height)|\(configuration.theme.contentBackgroundColor.ss_cssString)|\(configuration.darkImageBlendRatio)" as NSString
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}
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private func adjustedImage(
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_ image: UIImage,
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backgroundColor: UIColor,
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blendRatio: CGFloat,
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cacheKey: NSString
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) -> UIImage {
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if let cached = Self.darkAdjustedImageCache.object(forKey: cacheKey) { return cached }
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let format = UIGraphicsImageRendererFormat()
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format.scale = image.scale
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format.opaque = false
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let renderer = UIGraphicsImageRenderer(size: image.size, format: format)
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let adjusted = renderer.image { context in
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image.draw(in: CGRect(origin: .zero, size: image.size))
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backgroundColor.withAlphaComponent(max(0, min(0.35, blendRatio))).setFill()
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context.cgContext.setBlendMode(.sourceAtop)
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context.fill(CGRect(origin: .zero, size: image.size))
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}
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Self.darkAdjustedImageCache.setObject(adjusted, forKey: cacheKey)
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return adjusted
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}
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#endif
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// MARK: - 高亮属性注入（对齐 WXRead 的 WRChapterData.addHighlightInRange:）
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private func applyHighlightsToContent(
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_ content: NSMutableAttributedString,
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highlights: [RDEPUBHighlight],
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page: RDEPUBTextPage
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) {
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for highlight in highlights {
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guard let rangeInfo = highlight.rangeInfo,
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let info = RDEPUBTextOffsetRangeInfo.decode(from: rangeInfo),
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let absoluteRange = info.nsRange else { continue }
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let overlap = NSIntersectionRange(absoluteRange, page.contentRange)
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guard overlap.length > 0 else { continue }
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let relativeRange = NSRange(location: overlap.location - page.pageStartOffset, length: overlap.length)
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guard relativeRange.location >= 0,
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relativeRange.location + relativeRange.length <= content.length else { continue }
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switch highlight.style {
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case .highlight:
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content.addAttribute(kRDEPUBHighlightAttributeName, value: highlight.uiColor, range: relativeRange)
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case .underline:
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content.addAttribute(kRDEPUBUnderlineAttributeName, value: highlight.uiColor, range: relativeRange)
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}
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}
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}
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// MARK: - Content Normalization
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private func normalizedPageContent(from page: RDEPUBTextPage) -> NSMutableAttributedString {
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let content = NSMutableAttributedString(attributedString: page.content)
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guard shouldNormalizeContinuationParagraph(for: page) else { return content }
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let text = content.string as NSString
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let firstParagraphRange = text.paragraphRange(for: NSRange(location: 0, length: 0))
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guard firstParagraphRange.length > 0 else { return content }
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content.enumerateAttribute(.paragraphStyle, in: firstParagraphRange) { value, range, _ in
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guard let style = value as? NSParagraphStyle else { return }
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let mutableStyle = (style.mutableCopy() as? NSMutableParagraphStyle) ?? NSMutableParagraphStyle()
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mutableStyle.firstLineHeadIndent = mutableStyle.headIndent
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mutableStyle.paragraphSpacingBefore = 0
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content.addAttribute(.paragraphStyle, value: mutableStyle.copy() as Any, range: range)
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}
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return content
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}
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private func shouldNormalizeContinuationParagraph(for page: RDEPUBTextPage) -> Bool {
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let pageStart = page.pageStartOffset
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guard pageStart > 0, pageStart < page.chapterContent.length else { return false }
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let chapterText = page.chapterContent.string as NSString
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guard let previousScalar = UnicodeScalar(chapterText.character(at: pageStart - 1)) else { return false }
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return !CharacterSet.newlines.contains(previousScalar)
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}
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// MARK: - CoreText Layout
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#if canImport(DTCoreText)
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private func updateCoreTextLayoutFrameIfNeeded() {
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guard !coreTextContentView.isHidden,
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let displayContent = coreTextDisplayContent,
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let displayRange = coreTextDisplayRange,
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let page = currentPage,
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coreTextContentView.bounds.width > 0,
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coreTextContentView.bounds.height > 0 else {
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interactionController.configure(layoutFrame: nil, page: currentPage)
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return
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}
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guard let layouter = DTCoreTextLayouter(attributedString: displayContent) else {
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coreTextContentView.layoutFrame = nil
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interactionController.configure(layoutFrame: nil, page: page)
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return
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}
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layouter.shouldCacheLayoutFrames = false
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let layoutFrame = layouter.layoutFrame(with: coreTextContentView.bounds, range: displayRange)
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coreTextContentView.layoutFrame = layoutFrame
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interactionController.configure(layoutFrame: layoutFrame, page: page)
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overlayView.updateSnapshot(interactionController.snapshot)
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backgroundOverlayView.updateSnapshot(interactionController.snapshot)
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}
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#endif
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// MARK: - Gestures
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@objc private func handleLongPress(_ gesture: UILongPressGestureRecognizer) {
|
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#if canImport(DTCoreText)
|
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layoutIfNeeded()
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selectionController.handleLongPress(
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gesture,
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renderView: coreTextRenderView,
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interactionController: interactionController
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)
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switch gesture.state {
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case .began:
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panGestureRecognizer.isEnabled = true
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case .ended:
|
||
panGestureRecognizer.isEnabled = false
|
||
showSelectionMenuIfNeeded()
|
||
case .cancelled, .failed:
|
||
panGestureRecognizer.isEnabled = false
|
||
default:
|
||
break
|
||
}
|
||
#endif
|
||
}
|
||
|
||
@objc private func handlePan(_ gesture: UIPanGestureRecognizer) {
|
||
#if canImport(DTCoreText)
|
||
selectionController.handlePan(
|
||
gesture,
|
||
renderView: coreTextRenderView,
|
||
interactionController: interactionController
|
||
)
|
||
switch gesture.state {
|
||
case .ended:
|
||
panGestureRecognizer.isEnabled = false
|
||
showSelectionMenuIfNeeded()
|
||
case .cancelled, .failed:
|
||
panGestureRecognizer.isEnabled = false
|
||
default:
|
||
break
|
||
}
|
||
#endif
|
||
}
|
||
|
||
@objc private func handleTap(_ gesture: UITapGestureRecognizer) {
|
||
let point = gesture.location(in: overlayView)
|
||
if currentSelection != nil {
|
||
clearSelection()
|
||
return
|
||
}
|
||
guard let highlight = highlight(at: point),
|
||
let sourceRect = highlightSourceRect(for: highlight, fallbackPoint: point) else {
|
||
return
|
||
}
|
||
delegate?.textContentView(self, didRequestHighlightActions: highlight, sourceRect: sourceRect)
|
||
}
|
||
|
||
private func showSelectionMenuIfNeeded() {
|
||
guard currentSelection != nil,
|
||
let targetRect = selectionController.menuAnchorRect(interactionController: interactionController),
|
||
!targetRect.isEmpty else {
|
||
return
|
||
}
|
||
becomeFirstResponder()
|
||
let menuController = UIMenuController.shared
|
||
menuController.menuItems = [
|
||
UIMenuItem(title: "拷贝", action: #selector(rd_copy(_:))),
|
||
UIMenuItem(title: "高亮", action: #selector(rd_highlight(_:))),
|
||
UIMenuItem(title: "批注", action: #selector(rd_annotate(_:)))
|
||
]
|
||
menuController.setTargetRect(targetRect, in: coreTextRenderView ?? self)
|
||
menuController.setMenuVisible(true, animated: true)
|
||
}
|
||
|
||
private func hideSelectionMenu() {
|
||
UIMenuController.shared.setMenuVisible(false, animated: true)
|
||
}
|
||
|
||
private var coreTextRenderView: RDEPUBTextPageRenderView? {
|
||
#if canImport(DTCoreText)
|
||
return coreTextContentView
|
||
#else
|
||
return nil
|
||
#endif
|
||
}
|
||
|
||
private func highlight(at point: CGPoint) -> RDEPUBHighlight? {
|
||
guard let page = currentPage else { return nil }
|
||
let absoluteRange = backgroundOverlayView.absoluteRange(at: point) ?? overlayView.absoluteRange(at: point)
|
||
guard let absoluteRange else { return nil }
|
||
let matches = currentHighlights.filter { highlight in
|
||
guard highlight.location.href == page.href,
|
||
let range = RDEPUBTextOffsetRangeInfo.decode(from: highlight.rangeInfo)?.nsRange else {
|
||
return false
|
||
}
|
||
return NSIntersectionRange(range, absoluteRange).length > 0
|
||
}
|
||
return matches.sorted { lhs, rhs in
|
||
let lhsRange = RDEPUBTextOffsetRangeInfo.decode(from: lhs.rangeInfo)?.nsRange?.length ?? .max
|
||
let rhsRange = RDEPUBTextOffsetRangeInfo.decode(from: rhs.rangeInfo)?.nsRange?.length ?? .max
|
||
if lhs.hasNote != rhs.hasNote {
|
||
return lhs.hasNote && !rhs.hasNote
|
||
}
|
||
return lhsRange < rhsRange
|
||
}.first
|
||
}
|
||
|
||
private func highlightSourceRect(for highlight: RDEPUBHighlight, fallbackPoint: CGPoint) -> CGRect? {
|
||
guard let range = RDEPUBTextOffsetRangeInfo.decode(from: highlight.rangeInfo)?.nsRange else {
|
||
let fallbackRect = CGRect(origin: fallbackPoint, size: CGSize(width: 1, height: 1))
|
||
return overlayView.convert(fallbackRect, to: self)
|
||
}
|
||
let rects = interactionController.selectionRects(for: range)
|
||
if let first = rects.first {
|
||
var unionRect = first
|
||
for rect in rects.dropFirst() {
|
||
unionRect = unionRect.union(rect)
|
||
}
|
||
return overlayView.convert(unionRect, to: self)
|
||
}
|
||
let fallbackRect = CGRect(origin: fallbackPoint, size: CGSize(width: 1, height: 1))
|
||
return overlayView.convert(fallbackRect, to: self)
|
||
}
|
||
|
||
override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
|
||
if gestureRecognizer === panGestureRecognizer {
|
||
return selectionController.isSelecting
|
||
}
|
||
if gestureRecognizer === tapGestureRecognizer {
|
||
guard let tapGestureRecognizer = gestureRecognizer as? UITapGestureRecognizer else {
|
||
return false
|
||
}
|
||
if selectionController.hasActiveSelection {
|
||
return true
|
||
}
|
||
let point = tapGestureRecognizer.location(in: overlayView)
|
||
return highlight(at: point) != nil
|
||
}
|
||
return true
|
||
}
|
||
|
||
func gestureRecognizer(
|
||
_ gestureRecognizer: UIGestureRecognizer,
|
||
shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer
|
||
) -> Bool {
|
||
gestureRecognizer === longPressGestureRecognizer || gestureRecognizer === panGestureRecognizer
|
||
}
|
||
}
|
||
|
||
// MARK: - UIColor Extension
|
||
|
||
private extension UIColor {
|
||
var rd_isDarkReaderBackground: Bool {
|
||
var red: CGFloat = 0, green: CGFloat = 0, blue: CGFloat = 0, alpha: CGFloat = 0
|
||
guard getRed(&red, green: &green, blue: &blue, alpha: &alpha) else { return false }
|
||
return (0.2126 * red + 0.7152 * green + 0.0722 * blue) < 0.35
|
||
}
|
||
}
|