131 lines
5.0 KiB
Swift
131 lines
5.0 KiB
Swift
// RDEPUBWebView+FixedLayout.swift
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// RDEPUBWebView 的固定版式渲染扩展
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// 处理固定版式（Fixed Layout）的加载流程：生成 HTML 模板、
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// 计算加载签名（去重）、设置固定版式就绪回退定时器等。
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import UIKit
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import WebKit
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extension RDEPUBWebView {
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/// 便捷方法：加载固定版式的 spread 页面
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public func loadFixedSpread(
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parser: RDEPUBParser,
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spread: EPUBFixedSpread,
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viewportSize: CGSize,
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contentInset: UIEdgeInsets,
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backgroundColor: UIColor?
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) {
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let request = RDEPUBRenderRequest.fixed(
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RDEPUBFixedRenderRequest(
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spread: spread,
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viewportSize: viewportSize,
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contentInset: contentInset,
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backgroundColorCSS: backgroundColor?.ss_hexString,
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fit: .page,
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searchPresentation: nil
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)
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)
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load(publication: parser.makePublication(), request: request)
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}
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/// 处理固定版式加载：设置状态、生成 HTML、加载到 WebView
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func handleFixedLayoutLoad(
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publication: RDEPUBPublication,
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request: RDEPUBFixedRenderRequest,
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loadSignature: String,
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in webView: WKWebView
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) {
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currentPageIndex = 0
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currentTotalPagesInChapter = 1
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viewportSize = request.viewportSize
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currentPadding = request.contentInset
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currentFontSize = 16
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currentLineHeightMultiple = 1.5
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currentThemeBackgroundColor = request.backgroundColorCSS
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currentThemeTextColor = nil
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targetLocation = nil
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pendingHighlights = []
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fixedSpread = request.spread
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isFixedLayout = true
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pendingProgressionRequest = false
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currentLoadSignature = loadSignature
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scheduleFixedLayoutReadyFallback()
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let html = RDEPUBFixedLayoutTemplate.html(for: request, publication: publication)
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RDEPUBWebViewDebug.log(debugScope, message: "load fixed spread resources=\(request.spread.resources.map(\.href).joined(separator: ",")) fit=\(request.fit.rawValue)")
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webView.loadHTMLString(
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html,
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baseURL: URL(string: "\(RDEPUBResourceURLSchemeHandler.scheme)://\(RDEPUBResourceURLSchemeHandler.host)/")
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)
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}
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/// 生成固定版式加载签名（用于去重相同请求）
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func fixedLayoutLoadSignature(publicationKey: String, request: RDEPUBFixedRenderRequest) -> String {
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let searchSignature = [
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request.searchPresentation?.keyword ?? "",
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request.searchPresentation?.resources.map {
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[
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$0.href,
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String($0.matchCount),
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String($0.activeLocalMatchIndex ?? -1)
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].joined(separator: "|")
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}.joined(separator: ",") ?? ""
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].joined(separator: "#")
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return [
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publicationKey,
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"fixed",
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request.spread.resources.map(\.href).joined(separator: "|"),
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String(format: "%.2f", request.viewportSize.width),
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String(format: "%.2f", request.viewportSize.height),
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String(format: "%.2f", request.contentInset.top),
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String(format: "%.2f", request.contentInset.left),
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String(format: "%.2f", request.contentInset.bottom),
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String(format: "%.2f", request.contentInset.right),
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request.backgroundColorCSS ?? "",
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request.fit.rawValue,
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searchSignature
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].joined(separator: "#")
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}
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/// 调度固定版式就绪回退定时器（1 秒后如果未收到 ready 消息则手动触发渲染完成）
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func scheduleFixedLayoutReadyFallback() {
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let workItem = DispatchWorkItem { [weak self] in
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RDEPUBWebViewDebug.log(self?.debugScope ?? "ReaderWebView", message: "fixed ready fallback fired")
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self?.applyFixedPresentationIfNeeded {
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self?.refreshNativeDecorationsIfNeeded {
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self?.rendered()
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}
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}
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}
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fixedLayoutReadyWorkItem = workItem
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DispatchQueue.main.asyncAfter(deadline: .now() + 1.0, execute: workItem)
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}
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/// 取消固定版式就绪回退定时器
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func cancelFixedLayoutReadyFallback() {
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fixedLayoutReadyWorkItem?.cancel()
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fixedLayoutReadyWorkItem = nil
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}
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func applyFixedPresentationIfNeeded(completion: (() -> Void)? = nil) {
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guard let webView,
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let currentRenderRequest,
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case .fixed(let request) = currentRenderRequest else {
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completion?()
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return
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}
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let script = RDEPUBJavaScriptBridge.applyFixedPresentationScript(for: request)
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webView.evaluateJavaScript(script) { [weak self] _, error in
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guard let self else {
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completion?()
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return
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}
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if let error {
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self.delegate?.epubWebView(self, didLogJavaScriptError: error.localizedDescription)
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}
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self.applySearchDecorationsIfNeeded(completion: completion)
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}
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}
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}
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