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如何在 scrollWheel 事件中获得“计数”？

[英]How do I get the 'count' in scrollWheel event?

 原文  2019-10-14 12:26:51  1   1    swift/ macos/ nsscrollview

问题描述

When overriding scrollWheel() method, I can see in the event.description a 'count:' that is incremented when I scroll continuously on a trackpad.当覆盖 scrollWheel() 方法时，我可以在 event.description 中看到一个“计数：”，当我在触控板上连续滚动时它会增加。

override func scrollWheel( with event: NSEvent )
{
    print( event )
}

The output while scrolling: output 滚动时：

NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.7 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-1.000000 deltaY=0.000000 count:0 phase=Began momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.7 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-8.000000 deltaY=1.000000 count:0 phase=Changed momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.7 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-13.000000 deltaY=1.000000 count:0 phase=Changed momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.7 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-18.000000 deltaY=2.000000 count:0 phase=Changed momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.7 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-24.000000 deltaY=2.000000 count:0 phase=Changed momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.7 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-92.000000 deltaY=5.000000 count:1 phase=Changed momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.8 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-47.000000 deltaY=2.000000 count:1 phase=Changed momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.8 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-54.000000 deltaY=3.000000 count:1 phase=Changed momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.8 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-84.000000 deltaY=0.000000 count:1 phase=None momentumPhase=Began
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.8 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-240.000000 deltaY=0.000000 count:1 phase=None momentumPhase=Changed
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.9 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-73.000000 deltaY=0.000000 count:1 phase=None momentumPhase=Changed
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.9 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-69.000000 deltaY=0.000000 count:1 phase=None momentumPhase=Changed
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.9 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-65.000000 deltaY=0.000000 count:1 phase=None momentumPhase=Changed
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.9 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-62.000000 deltaY=0.000000 count:1 phase=None momentumPhase=Changed
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.9 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-58.000000 deltaY=0.000000 count:1 phase=None momentumPhase=Changed
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8103.9 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-54.000000 deltaY=0.000000 count:1 phase=None momentumPhase=Changed
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8104.0 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-51.000000 deltaY=0.000000 count:1 phase=None momentumPhase=Changed
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8104.0 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-47.000000 deltaY=0.000000 count:1 phase=None momentumPhase=Changed
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8104.0 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-43.000000 deltaY=0.000000 count:1 phase=None momentumPhase=Changed
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8104.0 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-39.000000 deltaY=0.000000 count:1 phase=None momentumPhase=Changed
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8104.0 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=0.000000 deltaY=0.000000 count:1 phase=None momentumPhase=Ended
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8104.0 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-11.000000 deltaY=0.000000 count:2 phase=Began momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8104.0 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-56.000000 deltaY=2.000000 count:2 phase=Changed momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8104.1 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-61.000000 deltaY=3.000000 count:2 phase=Changed momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8104.1 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-82.000000 deltaY=4.000000 count:2 phase=Changed momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8104.1 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-106.000000 deltaY=6.000000 count:2 phase=Changed momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8104.1 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-110.000000 deltaY=7.000000 count:2 phase=Changed momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8104.1 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-68.000000 deltaY=5.000000 count:2 phase=Changed momentumPhase=None
NSEvent: type=ScrollWheel loc=(1036.14,554.34) time=8104.1 flags=0 win=0x10dd080c0 winNum=890 ctxt=0x0 deltaX=-152.000000 deltaY=0.000000 count:2 phase=None momentumPhase=Began

How can I actually get the "Count" from the NSEvent as there is no such variable or method?由于没有这样的变量或方法，我如何才能真正从 NSEvent 获取“计数”？

1 个解决方案

解决方案1
 0  2019-10-14 13:42:37

Thanks to @Willeke, here is the Swift version:感谢@Willeke，这里是 Swift 版本：

override func scrollWheel( with event: NSEvent )
{
    print( event )
    if let count = event.cgEvent?.getIntegerValueField( CGEventField.scrollWheelEventScrollCount )
    {
        print( count )
    }
} 

NSEvent: type=ScrollWheel loc=(824.82,567.461) time=12769.8 flags=0 win=0x10db2fa10 winNum=1327 ctxt=0x0 deltaX=0.000000 deltaY=0.000000 count:0 phase=MayBegin momentumPhase=None
0
NSEvent: type=ScrollWheel loc=(824.82,567.461) time=12769.8 flags=0 win=0x10db2fa10 winNum=1327 ctxt=0x0 deltaX=-5.000000 deltaY=0.000000 count:0 phase=Began momentumPhase=None
0
NSEvent: type=ScrollWheel loc=(824.82,567.461) time=12769.8 flags=0 win=0x10db2fa10 winNum=1327 ctxt=0x0 deltaX=-18.000000 deltaY=1.000000 count:0 phase=Changed momentumPhase=None
0
NSEvent: type=ScrollWheel loc=(824.82,567.461) time=12769.9 flags=0 win=0x10db2fa10 winNum=1327 ctxt=0x0 deltaX=-35.000000 deltaY=2.000000 count:1 phase=Changed momentumPhase=None
1
NSEvent: type=ScrollWheel loc=(824.82,567.461) time=12769.9 flags=0 win=0x10db2fa10 winNum=1327 ctxt=0x0 deltaX=-84.000000 deltaY=4.000000 count:1 phase=Changed momentumPhase=None
1
NSEvent: type=ScrollWheel loc=(824.82,567.461) time=12769.9 flags=0 win=0x10db2fa10 winNum=1327 ctxt=0x0 deltaX=-92.000000 deltaY=6.000000 count:1 phase=Changed momentumPhase=None
1
NSEvent: type=ScrollWheel loc=(824.82,567.461) time=12769.9 flags=0 win=0x10db2fa10 winNum=1327 ctxt=0x0 deltaX=-103.000000 deltaY=9.000000 count:1 phase=Changed momentumPhase=None
1
NSEvent: type=ScrollWheel loc=(824.82,567.461) time=12770.1 flags=0 win=0x10db2fa10 winNum=1327 ctxt=0x0 deltaX=0.000000 deltaY=0.000000 count:1 phase=None momentumPhase=Ended
1
NSEvent: type=ScrollWheel loc=(824.82,567.461) time=12770.1 flags=0 win=0x10db2fa10 winNum=1327 ctxt=0x0 deltaX=-25.000000 deltaY=0.000000 count:2 phase=Began momentumPhase=None
2
NSEvent: type=ScrollWheel loc=(824.82,567.461) time=12770.1 flags=0 win=0x10db2fa10 winNum=1327 ctxt=0x0 deltaX=-84.000000 deltaY=2.000000 count:2 phase=Changed momentumPhase=None
2
NSEvent: type=ScrollWheel loc=(824.82,567.461) time=12770.1 flags=0 win=0x10db2fa10 winNum=1327 ctxt=0x0 deltaX=-89.000000 deltaY=3.000000 count:2 phase=Changed momentumPhase=None

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