├── screenshots
    └── custom-class.png
├── README.md
├── LICENSE
└── ScrollableSlider.swift


/screenshots/custom-class.png:
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https://raw.githubusercontent.com/thompsonate/Scrollable-NSSlider/HEAD/screenshots/custom-class.png


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/README.md:
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 1 | # Scrollable-NSSlider
 2 | `ScrollableSlider` is a subclass of NSSlider that accepts input from scrolling events. Apple doesn't support this natively, so this subclass was created to allow for scrolling input.
 3 | 
 4 | `ScrollableSlider` supports vertical, horizontal, and circular NSSliders. It also accounts for natural scroll direction, so you'll be scrolling in the right direction regardless of your settings.
 5 | 
 6 | # How to implement
 7 | 1. Add the [ScrollableSlider](ScrollableSlider.swift) class to your code.
 8 | 1. For any slider you want to operate with scrolling input, select it in Interface Builder and set the custom class to ScrollableSlider.
 9 | 1. Scroll!
10 | 
11 | <center><img src="screenshots/custom-class.png" width=40%></center>
12 | 


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/LICENSE:
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 1 | This is free and unencumbered software released into the public domain.
 2 | 
 3 | Anyone is free to copy, modify, publish, use, compile, sell, or
 4 | distribute this software, either in source code form or as a compiled
 5 | binary, for any purpose, commercial or non-commercial, and by any
 6 | means.
 7 | 
 8 | In jurisdictions that recognize copyright laws, the author or authors
 9 | of this software dedicate any and all copyright interest in the
10 | software to the public domain. We make this dedication for the benefit
11 | of the public at large and to the detriment of our heirs and
12 | successors. We intend this dedication to be an overt act of
13 | relinquishment in perpetuity of all present and future rights to this
14 | software under copyright law.
15 | 
16 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
19 | IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 | OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 | ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 | OTHER DEALINGS IN THE SOFTWARE.
23 | 
24 | For more information, please refer to <http://unlicense.org>
25 | 


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/ScrollableSlider.swift:
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 1 | //
 2 | //  ScrollableSlider.swift
 3 | //
 4 | //  Created by Nate Thompson on 10/24/17.
 5 | //
 6 | //
 7 | 
 8 | 
 9 | import Cocoa
10 | 
11 | class ScrollableSlider: NSSlider {
12 |     override func scrollWheel(with event: NSEvent) {
13 |         guard self.isEnabled else { return }
14 |         
15 |         let range = Float(self.maxValue - self.minValue)
16 |         var delta = Float(0)
17 |         
18 |         // Allow horizontal scrolling on horizontal and circular sliders
19 |         if _isVertical && self.sliderType == .linear {
20 |             delta = Float(event.deltaY)
21 |         } else if self.userInterfaceLayoutDirection == .rightToLeft {
22 |             delta = Float(event.deltaY + event.deltaX)
23 |         } else {
24 |             delta = Float(event.deltaY - event.deltaX)
25 |         }
26 |         
27 |         // Account for natural scrolling
28 |         if event.isDirectionInvertedFromDevice {
29 |             delta *= -1
30 |         }
31 |         
32 |         let increment = range * delta / 100
33 |         var value = self.floatValue + increment
34 |         
35 |         // Wrap around if slider is circular
36 |         if self.sliderType == .circular {
37 |             let minValue = Float(self.minValue)
38 |             let maxValue = Float(self.maxValue)
39 |             
40 |             if value < minValue {
41 |                 value = maxValue - abs(increment)
42 |             } else if value > maxValue {
43 |                 value = minValue + abs(increment)
44 |             }
45 |         }
46 |         
47 |         self.floatValue = value
48 |         self.sendAction(self.action, to: self.target)
49 |     }
50 |     
51 |     
52 |     private var _isVertical: Bool {
53 |         if #available(macOS 10.12, *) {
54 |             return self.isVertical
55 |         } else {
56 |             // isVertical is an NSInteger in versions before 10.12
57 |             return self.value(forKey: "isVertical") as! NSInteger == 1
58 |         }
59 |     }
60 | }
61 | 


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