feat(epub): align wxread css and overlay pagination behavior

2026-05-25 22:15:24 +08:00
parent c0aac56083
commit 23182e8b5a
31 changed files with 2585 additions and 1691 deletions
@@ -0,0 +1,50 @@
+import UIKit
+
+/// WebView 路径的原生装饰覆盖层。
+/// 对标 WXRead 的页面级装饰绘制思路：JS 只负责提供 rect，实际视觉绘制由原生 CGContext 完成。
+final class RDEPUBWebDecorationOverlayView: UIView {
+    private var decorations: [RDEPUBTextOverlayDecoration] = []
+    private let verticalAdjustment: CGFloat = -1
+
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        backgroundColor = .clear
+        isOpaque = false
+        isUserInteractionEnabled = false
+    }
+
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    func applyDecorations(_ decorations: [RDEPUBTextOverlayDecoration]) {
+        self.decorations = decorations.filter { !$0.rects.isEmpty }
+        setNeedsDisplay()
+    }
+
+    override func draw(_ rect: CGRect) {
+        guard let context = UIGraphicsGetCurrentContext() else { return }
+
+        for decoration in decorations {
+            switch decoration.kind {
+            case .underline:
+                context.setStrokeColor(decoration.color.cgColor)
+                context.setLineWidth(2)
+                for underlineRect in decoration.rects {
+                    let y = underlineRect.maxY - 1
+                    context.move(to: CGPoint(x: underlineRect.minX, y: y))
+                    context.addLine(to: CGPoint(x: underlineRect.maxX, y: y))
+                    context.strokePath()
+                }
+            default:
+                context.setFillColor(decoration.color.cgColor)
+                for selectionRect in decoration.rects {
+                    let adjustedRect = selectionRect.offsetBy(dx: 0, dy: verticalAdjustment)
+                    let path = UIBezierPath(roundedRect: adjustedRect.insetBy(dx: -1, dy: -1), cornerRadius: 4)
+                    context.addPath(path.cgPath)
+                    context.fillPath()
+                }
+            }
+        }
+    }
+}