wt
0ef77f7f6a
- Raise the swipe dominance threshold to 2.0 and add a 24pt activation distance so diagonal timeline scrolls never move bubbles or fire haptics, and snap the indicator back when a gesture turns vertical mid-drag. - Cover the stricter thresholds in MessageReplySwipeTests.
39 lines
1.5 KiB
Swift
39 lines
1.5 KiB
Swift
import CoreGraphics
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struct MessageReplySwipePolicy {
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static let triggerDistance: CGFloat = 64
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/// Horizontal travel required before the reply indicator appears. Keeps
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/// the per-cell state untouched during ordinary vertical scrolling.
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static let activationDistance: CGFloat = 24
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static let maximumOffset: CGFloat = 76
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/// The drag must be clearly horizontal: a mostly vertical timeline scroll
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/// (even a diagonal one) must never arm the reply swipe or move bubbles.
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static let horizontalDominance: CGFloat = 2.0
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static func offset(for translation: CGSize) -> CGFloat {
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guard isHorizontal(translation) else { return 0 }
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let width = abs(translation.width)
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guard width >= activationDistance else { return 0 }
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let distance = min((width - activationDistance) * 0.72 + 12, maximumOffset)
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return translation.width < 0 ? -distance : distance
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}
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static func shouldReply(
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translation: CGSize,
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predictedEndTranslation: CGSize
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) -> Bool {
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let candidate = abs(predictedEndTranslation.width) > abs(translation.width)
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? predictedEndTranslation
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: translation
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return isHorizontal(candidate) && abs(candidate.width) >= triggerDistance
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}
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static func progress(for offset: CGFloat) -> CGFloat {
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min(1, abs(offset) / triggerDistance)
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}
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private static func isHorizontal(_ translation: CGSize) -> Bool {
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abs(translation.width) > abs(translation.height) * horizontalDominance
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}
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}
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