37 lines
1.2 KiB
Swift
37 lines
1.2 KiB
Swift
//
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// InertialScroller.swift
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// VoidLink
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//
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// Created by True砖家 on 2025/12/5.
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// Copyright © 2025 True砖家 on Bilibili. All rights reserved.
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//
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class InertialScroller {
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public var decelerationRateX: CGFloat
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public var decelerationRateY: CGFloat
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public lazy var timer: SafeTimer? = {
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SafeTimer(interval: 1/displayLinkRate) { [weak self] in
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guard let self = self, handler != nil else {return}
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self.vector.dx = self.vector.dx * decelerationRateX
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self.vector.dy = self.vector.dy * decelerationRateY
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if abs(self.vector.dx) < self.timerSuspendThreshold && abs(self.vector.dy) < self.timerSuspendThreshold {
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self.timer?.pause()
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}
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(self.handler ?? {})()
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}
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}()
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public var vector: CGVector = .zero
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public var displayLinkRate: CGFloat
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public var timerSuspendThreshold: CGFloat = 0.06
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public var handler: (() -> Void)?
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init(decelerationRate: CGFloat = 0.93, displayLinkRate: CGFloat = 60, handler: (() -> Void)? = nil) {
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self.decelerationRateX = decelerationRate
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self.decelerationRateY = decelerationRate
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self.displayLinkRate = displayLinkRate
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self.handler = handler
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}
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}
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