Question

I tried this XAML:

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

And this C#:

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

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?

Answer 1

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

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