51 lines
1.9 KiB
Swift
51 lines
1.9 KiB
Swift
import UIKit
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/// WebView 路径的原生装饰覆盖层。
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/// 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。
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final class RDEPUBWebDecorationOverlayView: UIView {
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private var decorations: [RDEPUBTextOverlayDecoration] = []
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private let verticalAdjustment: CGFloat = -1
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override init(frame: CGRect) {
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super.init(frame: frame)
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backgroundColor = .clear
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isOpaque = false
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isUserInteractionEnabled = false
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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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func applyDecorations(_ decorations: [RDEPUBTextOverlayDecoration]) {
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self.decorations = decorations.filter { !$0.rects.isEmpty }
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setNeedsDisplay()
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}
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override func draw(_ rect: CGRect) {
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guard let context = UIGraphicsGetCurrentContext() else { return }
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for decoration in decorations {
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switch decoration.kind {
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case .underline:
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context.setStrokeColor(decoration.color.cgColor)
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context.setLineWidth(2)
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for underlineRect in decoration.rects {
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let y = underlineRect.maxY - 1
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context.move(to: CGPoint(x: underlineRect.minX, y: y))
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context.addLine(to: CGPoint(x: underlineRect.maxX, y: y))
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context.strokePath()
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}
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default:
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context.setFillColor(decoration.color.cgColor)
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for selectionRect in decoration.rects {
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let adjustedRect = selectionRect.offsetBy(dx: 0, dy: verticalAdjustment)
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let path = UIBezierPath(roundedRect: adjustedRect.insetBy(dx: -1, dy: -1), cornerRadius: 4)
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context.addPath(path.cgPath)
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context.fillPath()
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}
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}
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}
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}
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}
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