检测滚动已通过PointerWheelChanged完成 [英] Detect scroll is completed with PointerWheelChanged
问题描述
我使用WinRT上的PointerWheelChanged事件检测鼠标滚轮滚动.我使用PointerPoint.Properties.MouseWheelDelta来检测滚动的数量和方向:
I detect mouse wheel scroll using PointerWheelChanged event at WinRT. I use PointerPoint.Properties.MouseWheelDelta to detect amount and direction of scroll:
PointerPoint mousePosition = e.GetCurrentPoint(_control);
var delta = mousePosition.Properties.MouseWheelDelta;
如今，有些设备可以模拟鼠标滚动(触摸板或触摸鼠标等).
他们往往会为每个滚动"发出数十个或数百个(sic！)PointerWheelChanged事件.旧鼠标滚轮每点击一次鼠标就会发出一个事件，其增量为+ -120个单位.
Nowadays there are devices which emulate mouse scroll (touchpad or touch mice etc).
They tend to issue tens or hundreds (sic!) PointerWheelChanged events per "scroll". Legacy mouse wheel issues one event per wheel click which has delta of +-120 units.
用户滚动到某个位置时，我需要做一些繁重的处理.
I need to do some heavy processing as soon as user scrolls to some position.
有没有办法理解新"滚动是否完成?
Is there a way to understand that "new" scroll is complete?
仅供参考，这是使用Microsoft TouchMouse进行单指轻击的鼠标滚轮增量(抱歉，我只想举例说明问题).
FYI Here is a mouse wheel deltas for a single finger flick with Microsoft TouchMouse (sorry for the amount, I just want to illustrate the problem).
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现在，我要进行此破解，但这远非完美
Now I do this hack but it is far from perfect
// interval between mouse deltas
private readonly TimeSpan _wheelDeltaThrottleInterval = TimeSpan.FromMilliseconds(8);
// interval to wait until scroll is complete
private readonly TimeSpan _wheelDeltaCompleteInterval = TimeSpan.FromMilliseconds(600);
// create smart wheel handler
IObservable<PointerPoint> pointerWheelObservable =
System.Reactive.Linq.Observable
.FromEventPattern<PointerEventHandler, PointerRoutedEventArgs>(
handler => _control.PointerWheelChanged += handler,
handler => _control.PointerWheelChanged -= handler)
.Select(eventPattern =>
{
PointerRoutedEventArgs e = eventPattern.EventArgs;
PointerPoint mousePosition = e.GetCurrentPoint(_control);
return mousePosition;
})
.Where(mousePosition => Math.Abs(mousePosition.Properties.MouseWheelDelta) > MouseWheelDeltaThreshold);
// subscribe to wheel changes
pointerWheelObservable
.Throttle(_wheelDeltaThrottleInterval)
.ObserveOnDispatcher()
.Subscribe(
OnPointerWheelChanged,
Logger.TrackException);
pointerWheelObservable
.Throttle(_wheelDeltaCompleteInterval)
.Subscribe(
OnPointerWheelCompleted,
Logger.TrackException);
EDIT2 GestureRecognizer类没有帮助
EDIT2 GestureRecognizer class does not help
请参阅此精彩的博客文章，了解有关Windws 8操作处理的信息. http://blogs .msdn.com/b/windowsappdev/archive/2012/07/02/modernizing-input-in-windows-8.aspx
See this great blog post regarding Windws 8 manipulations handling. http://blogs.msdn.com/b/windowsappdev/archive/2012/07/02/modernizing-input-in-windows-8.aspx
不幸的是，经过我的实验，我发现GestureRecognizer无法检测到洪水结束的鼠标滚轮事件.每次调用.ProcessMouseWheelEvent()后，都会触发ManipulationCompleted事件.
Unfortunately after my experiments I see GestureRecognizer is not able to detect mouse wheel events flood is over. It fires ManipulationCompleted event after each call of .ProcessMouseWheelEvent()
推荐答案
使用GestureRecognizer可以更好地检测包括鼠标鸣叫在内的各种操作. 所有输入(鼠标，触摸，笔等)都包含在此处，并且比传统的操作事件提供更好的支持. (它们不支持单点触摸旋转，鼠标滚动等).
Use GestureRecognizer for a better low level detection of manipulations including mouse whell. All inputs (mouse, touch, pen, etc.) are included here and supported better than traditional manipulation events. (they don't support single touch rotation, mouse scroller, etc.)
http://code.msdn.microsoft. com/windowsapps/Input-Windows-8-gestures-62c6689b#content
这比从头开始执行所有操作要高效，灵活和安全.
This is much more efficient, flexible and safer than implementing everything from scratch.
这篇关于检测滚动已通过PointerWheelChanged完成的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
