Search code examples
wpfxamlslider

WPF: Slider with an event that triggers after a user drags

I am currently making an MP3 player in WPF, and I want to make a slider that will allow the user to seek to a particular position in an MP3 by sliding the slider to the left or right.

I have tried using the ValueChanged event but that triggers every time it's value is changed, so if you drag it across, the event will fire multiple times, I want the event to only fire when the user has finished dragging the slider and Then get the new value.

How can I achieve this?

[Update]

I have found this post on MSDN which basically discusses the same thing, and they came up with two "solutions"; either subclassing the Slider or invoking a DispatcherTimer in the ValueChanged event that invokes the action after a timespan.

Can you come up with anything better then the two mentioned above?

Solution

  • You can use the thumb's 'DragCompleted' event for this. Unfortunately, this is only fired when dragging, so you'll need to handle other clicks and key presses separately. If you only want it to be draggable, you could disable these means of moving the slider by setting LargeChange to 0 and Focusable to false.

    Example:

    <Slider Thumb.DragCompleted="MySlider_DragCompleted" />