MacOSXでマウスカーソル移動アクセラレーションとスクロールホイールアクセラレーションはどこに実装されていますか?MacOSXでマウスカーソル移動アクセラレーションとスクロールホイールアクセラレーションが実装されています
APIレベルでは、Core Graphics/Quartz Event Servicesは、CGEventタイプを提供します。アプリケーション側で
、そこthis Chrome change reviewで多くの関連で興味深いコメントがあり、そこthis commentから抽出:カーネルレベルで
// Of Mice and Men
// ---------------
//
// There are three types of scroll data available on a scroll wheel CGEvent.
// Apple's documentation ([1]) is rather vague in their differences, and not
// terribly helpful in deciding which to use. This is what's really going on.
//
// First, these events behave very differently depending on whether a standard
// wheel mouse is used (one that scrolls in discrete units) or a
// trackpad/Mighty Mouse is used (which both provide continuous scrolling).
// You must check to see which was used for the event by testing the
// kCGScrollWheelEventIsContinuous field.
//
// Second, these events refer to "axes". Axis 1 is the y-axis, and axis 2 is
// the x-axis.
//
// Third, there is a concept of mouse acceleration. Scrolling the same amount
// of physical distance will give you different results logically depending on
// whether you scrolled a little at a time or in one continuous motion. Some
// fields account for this while others do not.
//
// Fourth, for trackpads there is a concept of chunkiness. When scrolling
// continuously, events can be delivered in chunks. That is to say, lots of
// scroll events with delta 0 will be delivered, and every so often an event
// with a non-zero delta will be delivered, containing the accumulated deltas
// from all the intermediate moves. [2]
//
// For notchy wheel mice (kCGScrollWheelEventIsContinuous == 0)
// ------------------------------------------------------------
//
// kCGScrollWheelEventDeltaAxis*
// This is the rawest of raw events. For each mouse notch you get a value of
// +1/-1. This does not take acceleration into account and thus is less
// useful for building UIs.
//
// kCGScrollWheelEventPointDeltaAxis*
// This is smarter. In general, for each mouse notch you get a value of
// +1/-1, but this _does_ take acceleration into account, so you will get
// larger values on longer scrolls. This field would be ideal for building
// UIs except for one nasty bug: when the shift key is pressed, this set of
// fields fails to move the value into the axis2 field (the other two types
// of data do). This wouldn't be so bad except for the fact that while the
// number of axes is used in the creation of a CGScrollWheelEvent, there is
// no way to get that information out of the event once created.
//
// kCGScrollWheelEventFixedPtDeltaAxis*
// This is a fixed value, and for each mouse notch you get a value of
// +0.1/-0.1 (but, like above, scaled appropriately for acceleration). This
// value takes acceleration into account, and in fact is identical to the
// results you get from -[NSEvent delta*]. (That is, if you linked on Tiger
// or greater; see [2] for details.)
//
// A note about continuous devices
// -------------------------------
//
// There are two devices that provide continuous scrolling events (trackpads
// and Mighty Mouses) and they behave rather differently. The Mighty Mouse
// behaves a lot like a regular mouse. There is no chunking, and the
// FixedPtDelta values are the PointDelta values multiplied by 0.1. With the
// trackpad, though, there is chunking. While the FixedPtDelta values are
// reasonable (they occur about every fifth event but have values five times
// larger than usual) the Delta values are unreasonable. They don't appear to
// accumulate properly.
//
// For continuous devices (kCGScrollWheelEventIsContinuous != 0)
// -------------------------------------------------------------
//
// kCGScrollWheelEventDeltaAxis*
// This provides values with no acceleration. With a trackpad, these values
// are chunked but each non-zero value does not appear to be cumulative.
// This seems to be a bug.
//
// kCGScrollWheelEventPointDeltaAxis*
// This provides values with acceleration. With a trackpad, these values are
// not chunked and are highly accurate.
//
// kCGScrollWheelEventFixedPtDeltaAxis*
// This provides values with acceleration. With a trackpad, these values are
// chunked but unlike Delta events are properly cumulative.
//
// Summary
// -------
//
// In general the best approach to take is: determine if the event is
// continuous. If it is not, then use the FixedPtDelta events (or just stick
// with Cocoa events). They provide both acceleration and proper horizontal
// scrolling. If the event is continuous, then doing pixel scrolling with the
// PointDelta is the way to go. In general, avoid the Delta events. They're
// the oldest (dating back to 10.4, before CGEvents were public) but they lack
// acceleration and precision, making them useful only in specific edge cases.
//
// References
// ----------
//
// [1] <http://developer.apple.com/documentation/Carbon/Reference/QuartzEventServicesRef/Reference/reference.html>
// [2] <http://developer.apple.com/releasenotes/Cocoa/AppKitOlderNotes.html>
// Scroll to the section headed "NSScrollWheel events".
//
// P.S. The "smooth scrolling" option in the system preferences is utterly
// unrelated to any of this.
、I/O Kitは、基本的なドライバインタフェースである、と私はマウスがあると思いますHID(ヒューマンインタフェースデバイス)ファミリ(IOHIDFamily)のものです。 XNU kernel source can be seen hereしかし、私はIOHIDFamilyを検索するときに1つの一致が見つからないので、それが完了しているかわかりません。コードはhere at IOHIDFamilyです。実際に私はIOHIPointing.cppにコメントが見つかりました:
/*
* 17 July 1998 sdouglas Initial creation
* 01 April 2002 ryepez added support for scroll acceleration
*/
をそして、それが実装されているように、コードから、それが見えます。誰かが確認できますか? hereも参照してください。
IOHIPointingのロジックは、最終的にCGEventにいかがですか?それはCore Graphics/Quartzのすべてですか?間に何がありますか?それはマッハの出来事のようなものですか?ジェネリックアーキテクチャの概要はありますか?
mouse scroll wheel acceleration in Linux/Xorg/libinput hereを実装するための議論が進行中であることから、私はこの疑問について疑問を抱いていました。
詳細な回答ありがとうございました!私はIOKitUserコード([here](https://github.com/opensource-apple/IOKitUser/))を少し見て、IOHIDSetScrollAcceleration'/IOHIDSetMouseAcceleration'と関連する関数を見つけました([も参照] https://github.com/practicalswift/osx/search?utf8=%E2%9C%93&q=kIOHIDScrollAccelerationKey&type=))、私はIOKitUserはこれについては論理を持っていないと思いますが、IOHIPointingはそうです。おそらく、マルチタッチドライバとWindowServerも同様です。 – Albert
@Albert興味深いことに、これらの関数はIO Registryオブジェクトのプロパティを設定するように見えます。結局のところ、カーネル内で起こるようです。 – pmdj