设置滚动条拇指大小 [英] Setting the Scrollbar Thumb size

问题描述

我正在尝试制定与 WPF 滚动条拇指元素大小相关的算法.

I am attempting to work out the algorithm associated with sizing of the WPF Scrollbar thumb element.

可以使用 Scrollbar.ViewportSize 属性调整 thumb 元素的大小，但它又与 Scrollbar.Minimum 和 Scrollbar.Maximum值.

The thumb element can be sized using the Scrollbar.ViewportSize property, but it in turn is related to the Scrollbar.Minimum and Scrollbar.Maximum values.

到目前为止我发现的是:

What I have discovered so far is:

对于 0 和 10 的最小值和最大值，ViewportSize 为:

For a Minimum and Maximum of 0 and 10, a ViewportSize of:

0 - 拇指最小尺寸
5 - 拇指大约 25% 的可用曲目
10 - 拇指大约 50% 的可用曲目
100 - 拇指大约 75% 的可用曲目
1000 - 拇指大约 90% 的可用曲目
10000 - 拇指填满可用的轨道.

0 - Thumb minimum size
5 - Thumb approximately 25% of the available track
10 - Thumb approximately 50% of the available track
100 - Thumb approximately 75% of the available track
1000 - Thumb approximately 90% of the available track
10000 - Thumb fills the available track.

[注意:这些数字只是我粗略的尝试和错误！]

[note: these figures are only from my rough trial and error!]

理想情况下，我希望能够有一个算法，在给定滚动条的最小值和最大值的情况下，我可以将拇指大小设置为可用轨道的 x%.

Ideally I'd like to be able to have an algorithm where given the minimum and maximum values for the Scrollbar I can set the thumb size to be exactly x% of the available track.

有人可以帮忙吗?

谢谢.

推荐答案

来自:http://msdn.microsoft.com/en-us/library/system.windows.controls.primitives.track(VS.90).aspx

拇指大小 =(viewportSize/(maximum–minimum+viewportSize))×trackLength

thumbSize = (viewportSize/(maximum–minimum+viewportSize))×trackLength

或重新安排viewportSize:

or re-arranging for viewportSize:

视口大小 =thumbSize×(maximum-minimum)/(trackLength-thumbSize)

viewportSize = thumbSize×(maximum-minimum)/(trackLength-thumbSize)

你可能已经找到了这个，但我想我会发布以防其他人在这里结束.

You've prob found this already but thought I'd post in case others end up here.

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