113 lines
4.4 KiB
Swift
113 lines
4.4 KiB
Swift
// RDEPUBPreferences.swift
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// EPUB 阅读偏好设置
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// 封装字号、行高、内容内边距、主题颜色、固定版式适配模式等展示参数，
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// 并提供从偏好设置生成渲染请求和展示样式的便捷方法。
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import UIKit
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/// EPUB 阅读偏好设置，包含所有影响渲染效果的展示参数
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public struct RDEPUBPreferences: Equatable {
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/// 字体大小（pt）
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public var fontSize: CGFloat
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/// 行高倍数（如 1.5 表示 1.5 倍行高）
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public var lineHeightMultiple: CGFloat
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/// 重排模式下的内容内边距
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public var reflowableContentInsets: UIEdgeInsets
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/// 固定版式下的内容内边距
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public var fixedContentInset: UIEdgeInsets
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/// 主题背景色（CSS 颜色值，如 "#FFFFFF"）
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public var themeBackgroundColor: String?
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/// 主题文字色（CSS 颜色值）
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public var themeTextColor: String?
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/// 固定版式背景色
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public var fixedBackgroundColor: String?
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/// 固定版式适配模式（page/width/height/contain/cover）
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public var fixedLayoutFit: RDEPUBFixedLayoutFit
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/// 固定版式双页展开模式（never/always/automatic）
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public var fixedLayoutSpreadMode: RDEPUBFixedLayoutSpreadMode
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/// 多栏排版栏数
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public var numberOfColumns: Int
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/// 多栏排版栏间距
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public var columnGap: CGFloat
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public init(
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fontSize: CGFloat,
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lineHeightMultiple: CGFloat,
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reflowableContentInsets: UIEdgeInsets,
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fixedContentInset: UIEdgeInsets,
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numberOfColumns: Int = 1,
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columnGap: CGFloat = 20,
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themeBackgroundColor: String? = nil,
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themeTextColor: String? = nil,
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fixedBackgroundColor: String? = nil,
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fixedLayoutFit: RDEPUBFixedLayoutFit = .page,
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fixedLayoutSpreadMode: RDEPUBFixedLayoutSpreadMode = .automatic
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) {
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self.fontSize = fontSize
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self.lineHeightMultiple = lineHeightMultiple
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self.reflowableContentInsets = reflowableContentInsets
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self.fixedContentInset = fixedContentInset
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self.numberOfColumns = max(1, numberOfColumns)
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self.columnGap = max(0, columnGap)
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self.themeBackgroundColor = themeBackgroundColor
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self.themeTextColor = themeTextColor
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self.fixedBackgroundColor = fixedBackgroundColor
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self.fixedLayoutFit = fixedLayoutFit
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self.fixedLayoutSpreadMode = fixedLayoutSpreadMode
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}
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/// 从偏好设置生成重排模式的展示样式
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public func presentationStyle(viewportSize: CGSize) -> RDEPUBPresentationStyle {
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RDEPUBPresentationStyle(
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viewportSize: viewportSize,
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contentInsets: reflowableContentInsets,
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fontSize: fontSize,
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lineHeightMultiple: lineHeightMultiple,
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numberOfColumns: numberOfColumns,
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columnGap: columnGap,
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themeBackgroundColor: themeBackgroundColor,
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themeTextColor: themeTextColor
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)
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}
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/// 根据页面和偏好设置生成对应的渲染请求（自动区分固定版式和重排）
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public func renderRequest(
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for page: EPUBPage,
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publication: RDEPUBPublication,
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viewportSize: CGSize,
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targetLocation: RDEPUBLocation? = nil,
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highlights: [RDEPUBHighlight] = [],
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searchPresentation: RDEPUBSearchPresentation? = nil
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) -> RDEPUBRenderRequest? {
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if publication.layout == .fixed, let fixedSpread = page.fixedSpread {
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return .fixed(
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RDEPUBFixedRenderRequest(
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spread: fixedSpread,
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viewportSize: viewportSize,
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contentInset: fixedContentInset,
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backgroundColorCSS: fixedBackgroundColor,
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fit: fixedLayoutFit,
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searchPresentation: searchPresentation
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)
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)
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}
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guard publication.spine.indices.contains(page.spineIndex) else {
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return nil
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}
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return .reflowable(
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RDEPUBReflowableRenderRequest(
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spineIndex: page.spineIndex,
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href: publication.spine[page.spineIndex].href,
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pageIndex: page.pageIndexInChapter,
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totalPagesInChapter: page.totalPagesInChapter,
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presentation: presentationStyle(viewportSize: viewportSize),
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targetLocation: targetLocation,
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highlights: highlights,
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searchPresentation: searchPresentation
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)
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)
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}
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}
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