refactor: split reader architecture and chrome handling

2026-05-31 21:47:54 +08:00
parent ea21c6a831
commit 44202357c0
80 changed files with 10635 additions and 8522 deletions
@@ -0,0 +1,136 @@
+import UIKit
+
+/// 前景覆盖层，负责绘制高亮、搜索命中和当前选区。
+final class RDEPUBTextAnnotationOverlay: RDEPUBSelectionOverlayView {
+    func applyHighlights(
+        _ highlights: [RDEPUBHighlight],
+        to content: NSMutableAttributedString,
+        page: RDEPUBTextPage,
+        contentBaseOffset: Int
+    ) {
+        let pageRange = absoluteOffsetRange(for: page)
+        let pageStart = pageRange.lowerBound
+        let pageEndExclusive = pageRange.upperBound
+
+        for highlight in highlights where highlight.location.href == page.href {
+            guard let range = RDEPUBTextOffsetRangeInfo.decode(from: highlight.rangeInfo)?.nsRange else { continue }
+            let overlapStart = max(range.location, pageStart)
+            let overlapEnd = min(range.location + range.length, pageEndExclusive)
+            guard overlapStart < overlapEnd else { continue }
+
+            let relativeRange = NSRange(
+                location: overlapStart - contentBaseOffset,
+                length: overlapEnd - overlapStart
+            )
+            switch highlight.style {
+            case .highlight:
+                content.addAttribute(
+                    .backgroundColor,
+                    value: UIColor(rdHexString: highlight.color, alpha: 0.45) ?? UIColor(red: 248 / 255, green: 225 / 255, blue: 108 / 255, alpha: 0.45),
+                    range: relativeRange
+                )
+            case .underline:
+                content.addAttribute(.underlineStyle, value: NSUnderlineStyle.single.rawValue, range: relativeRange)
+                if let color = UIColor(rdHexString: highlight.color, alpha: 1) {
+                    content.addAttribute(.underlineColor, value: color, range: relativeRange)
+                }
+            }
+        }
+    }
+
+    func applySearchHighlights(
+        to content: NSMutableAttributedString,
+        page: RDEPUBTextPage,
+        searchState: RDEPUBSearchState?,
+        contentBaseOffset: Int
+    ) {
+        guard let searchState else { return }
+
+        let normalColor = UIColor(red: 248 / 255, green: 225 / 255, blue: 108 / 255, alpha: 0.55)
+        let activeColor = UIColor(red: 255 / 255, green: 159 / 255, blue: 67 / 255, alpha: 0.75)
+        let pageRange = absoluteOffsetRange(for: page)
+        let pageStart = pageRange.lowerBound
+        let pageEndExclusive = pageRange.upperBound
+
+        for match in searchState.matches where match.href == page.href {
+            guard let matchStart = match.rangeLocation else { continue }
+            let matchEnd = matchStart + match.rangeLength
+            let overlapStart = max(matchStart, pageStart)
+            let overlapEnd = min(matchEnd, pageEndExclusive)
+            guard overlapStart < overlapEnd else { continue }
+
+            let relativeRange = NSRange(location: Int(overlapStart - contentBaseOffset), length: Int(overlapEnd - overlapStart))
+            let color = match == searchState.currentMatch ? activeColor : normalColor
+            content.addAttribute(.backgroundColor, value: color, range: relativeRange)
+        }
+    }
+
+    func buildDecorations(
+        page: RDEPUBTextPage,
+        highlights: [RDEPUBHighlight],
+        searchState: RDEPUBSearchState?,
+        interactionController: RDEPUBPageInteractionController
+    ) -> (background: [RDEPUBTextOverlayDecoration], foreground: [RDEPUBTextOverlayDecoration]) {
+        var background: [RDEPUBTextOverlayDecoration] = []
+        var foreground: [RDEPUBTextOverlayDecoration] = []
+        let pageRange = absoluteOffsetRange(for: page)
+        let pageStart = pageRange.lowerBound
+        let pageEndExclusive = pageRange.upperBound
+
+        if let searchState {
+            let normalColor = UIColor(red: 248 / 255, green: 225 / 255, blue: 108 / 255, alpha: 0.55)
+            let activeColor = UIColor(red: 255 / 255, green: 159 / 255, blue: 67 / 255, alpha: 0.75)
+
+            for match in searchState.matches where match.href == page.href {
+                guard let matchStart = match.rangeLocation else { continue }
+                let matchEnd = matchStart + match.rangeLength
+                let overlapStart = max(matchStart, pageStart)
+                let overlapEnd = min(matchEnd, pageEndExclusive)
+                guard overlapStart < overlapEnd else { continue }
+
+                let absoluteRange = NSRange(location: overlapStart, length: overlapEnd - overlapStart)
+                let rects = interactionController.selectionRects(for: absoluteRange)
+                guard !rects.isEmpty else { continue }
+
+                let isActive = match == searchState.currentMatch
+                let kind: RDEPUBTextOverlayDecoration.Kind = isActive ? .activeSearch : .search
+                let color = isActive ? activeColor : normalColor
+                background.append(RDEPUBTextOverlayDecoration(kind: kind, absoluteRange: absoluteRange, rects: rects, color: color))
+            }
+        }
+
+        for highlight in highlights where highlight.location.href == page.href {
+            guard let range = RDEPUBTextOffsetRangeInfo.decode(from: highlight.rangeInfo)?.nsRange else { continue }
+            let overlapStart = max(range.location, pageStart)
+            let overlapEnd = min(range.location + range.length, pageEndExclusive)
+            guard overlapStart < overlapEnd else { continue }
+
+            let absoluteRange = NSRange(location: overlapStart, length: overlapEnd - overlapStart)
+            let rects = interactionController.selectionRects(for: absoluteRange)
+            guard !rects.isEmpty else { continue }
+
+            let color = UIColor(rdHexString: highlight.color, alpha: 0.45)
+                ?? UIColor(red: 248 / 255, green: 225 / 255, blue: 108 / 255, alpha: 0.45)
+            let decoration = RDEPUBTextOverlayDecoration(
+                kind: highlight.style == .underline ? .underline : .highlight,
+                absoluteRange: absoluteRange,
+                rects: rects,
+                color: color
+            )
+
+            if decoration.kind == .underline {
+                foreground.append(decoration)
+            } else {
+                background.append(decoration)
+            }
+        }
+
+        return (background, foreground)
+    }
+
+    private func absoluteOffsetRange(for page: RDEPUBTextPage) -> Range<Int> {
+        let lowerBound = page.pageStartOffset
+        let upperBound = page.pageEndOffset + 1
+        return lowerBound..<max(upperBound, lowerBound)
+    }
+}