WPF:滑块不会引发 MouseLeftButtonDown 或 MouseLeftButtonUp

WPF: Slider doesnt raise MouseLeftButtonDown or MouseLeftButtonUp(WPF:滑块不会引发 MouseLeftButtonDown 或 MouseLeftButtonUp)

问题描述

我试过这个 XAML:

I tried this XAML:

<Slider Width="250" Height="25" Minimum="0" Maximum="1" MouseLeftButtonDown="slider_MouseLeftButtonDown" MouseLeftButtonUp="slider_MouseLeftButtonUp" />

还有这个 C#:

private void slider_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
sliderMouseDown = true;
}

private void slider_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
sliderMouseDown = false;
}

sliderMouseDown 变量永远不会改变，因为永远不会引发 MouseLeftButtonDown 和 MouseLeftButtonUp 事件.当用户在滑块上按下鼠标左键以将 bool 值设置为 true 并且当鼠标向上时 bool 设置为 false 时，如何让此代码工作?

The sliderMouseDown variable never changes because the MouseLeftButtonDown and MouseLeftButtonUp events are never raised. How can I get this code to work when a user has the left mouse button down on a slider to have a bool value set to true, and when the mouse is up, the bool is set to false?

推荐答案

滑块吞噬 MouseDown 事件(类似于按钮).

Sliders swallow the MouseDown Events (similar to the button).

您可以注册 PreviewMouseDown 和 PreviewMouseUp 事件，这些事件在滑块有机会处理它们之前被触发.

You can register for the PreviewMouseDown and PreviewMouseUp events which get fired before the slider has a chance to handle them.

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