如何使 WPF Slider Thumb 从任意点跟随光标

How to make WPF Slider Thumb follow cursor from any point(如何使 WPF Slider Thumb 从任意点跟随光标)

问题描述

我有这样的滑块:

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

我想做下一个行为:当 MouseDown 发生在滑块的任意一点时，Thumb 不仅会移动一次到该点，还会跟随光标直到 MouseUp 发生.

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.

对不起，如果已经问过了，我找不到那个问题.

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

推荐答案

此行为仅在您拖动滑块拇指本身时才会发生，这是设计使然.

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

然而，这里有一些代码可以做到这一点;-)

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

挂钩到 XAML 中的 MouseMove 事件:

Hook to the MouseMove event in XAML:

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

然后插入这段代码:

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;
    }
}

注意:

• 如果滑块的边距和内边距不同，您可能需要考虑它们，我没有.
• 这是在水平滑块上完成的.
• 我的滑块的最小值为 0，如果最小值为负数，请务必调整计算.
• 最后，它似乎只有在设置 IsMoveToPointEnabled 时才有效.

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