如何使WPF Slider Thumb从任何点跟随光标

I have such slider:

我有这样的滑块：

<Slider Minimum="0" Maximum="100" 
TickFrequency="1"
IsMoveToPointEnabled="True"
IsSnapToTickEnabled="False"/>

I want to make next behavior: when MouseDown occured at any point of slider, Thumb not only moves once to that point, but also following cursor until MouseUp occurs.

我想做下一个行为：当MouseDown在滑块的任何一点出现时，Thumb不仅会移动一次到该点，而且还会跟随光标直到MouseUp发生。

Sorry if it was asked already, i couldn't find that question.

对不起，如果已经问过，我找不到那个问题。

2 个解决方案

#1

This behavior will happen only when you drag the slider thumb itself, it is by design.

仅当您拖动滑块拇指本身时，才会发生此行为。

However, here's some code that will do it ;-)

但是，这里有一些代码可以做到;-)

Hook to the MouseMove event in XAML:

挂钩到XAML中的MouseMove事件：

<Slider MouseMove="Slider_OnMouseMove" IsMoveToPointEnabled="True"/>

Then insert this code:

然后插入此代码：

private void Slider_OnMouseMove(object sender, MouseEventArgs e)
{
    if (e.LeftButton == MouseButtonState.Pressed)
    {
        var slider = (Slider)sender;
        Point position = e.GetPosition(slider);
        double d = 1.0d / slider.ActualWidth * position.X;
        var p = slider.Maximum * d;
        slider.Value = p;
    }
}

Note :

注意：

You might have to take margins and padding of your slider into account should they differ, I haven't.
如果它们不同，您可能需要考虑滑块的边距和填充，我没有。
This was done on an horizontal slider.
这是在水平滑块上完成的。
Minimum value of my slider was 0, make sure to adjust the calculation should your minimum be negative.
我的滑块的最小值为0，如果最小值为负，请务必调整计算。
Finally, it does seem to work only when IsMoveToPointEnabled is set.
最后，它似乎只在IsMoveToPointEnabled设置时才有效。

#2

Aybe's solution works better in the thumb_MouseMove event.

Aybe的解决方案在thumb_MouseMove事件中效果更好。

void timelineThumb_MouseMove(object sender, MouseEventArgs e)
{

     if (e.LeftButton == MouseButtonState.Pressed)
     {
         var thumb = sender as Thumb;

         Point pos = e.GetPosition(uiVideoPlayerTimelineSlider);
         double d = 1.0d / uiVideoPlayerTimelineSlider.ActualWidth * pos.X;
         uiVideoPlayerTimelineSlider.Value = uiVideoPlayerTimelineSlider.Maximum * d;

     }
}

#1