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45 changes: 45 additions & 0 deletions
45
OpenHaystack/OpenHaystack/HaystackApp/Views/Slider+LogScale.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| // | ||
| // OpenHaystack – Tracking personal Bluetooth devices via Apple's Find My network | ||
| // | ||
| // Copyright © 2021 Secure Mobile Networking Lab (SEEMOO) | ||
| // Copyright © 2021 The Open Wireless Link Project | ||
| // | ||
| // SPDX-License-Identifier: AGPL-3.0-only | ||
| // | ||
|
|
||
| import SwiftUI | ||
|
|
||
| extension Binding where Value == Double { | ||
| func logarithmic(base: Double = 10.0) -> Binding<Double> { | ||
| Binding( | ||
| get: { | ||
| logC(self.wrappedValue, forBase: base) | ||
| }, | ||
| set: { (newValue) in | ||
| self.wrappedValue = pow(base, newValue) | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| extension Slider { | ||
| static func withLogScale( | ||
| base: Double = 10.0, | ||
| value: Binding<Double>, | ||
| in inRange: ClosedRange<Double>, | ||
| minimumValueLabel: ValueLabel = EmptyView() as! ValueLabel, | ||
| maximumValueLabel: ValueLabel = EmptyView() as! ValueLabel, | ||
| label: () -> Label = { EmptyView() as! Label }, | ||
| onEditingChanged: @escaping (Bool) -> Void = { _ in } | ||
| ) -> Slider where Label: View, ValueLabel: View { | ||
| return self.init( | ||
| value: value.logarithmic(base: base), | ||
| in: logC(inRange.lowerBound, forBase: base)...logC(inRange.upperBound, forBase: base), | ||
| onEditingChanged: onEditingChanged, minimumValueLabel: minimumValueLabel, | ||
| maximumValueLabel: maximumValueLabel, | ||
| label: label) | ||
| } | ||
| } | ||
|
|
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| private func logC(_ value: Double, forBase base: Double) -> Double { | ||
| return log(value) / log(base) | ||
| } |