Reloading stylesheets

David Grieve david.grieve at
Wed Dec 11 09:19:37 PST 2013

There is clearly a bug there somewhere. Would you mind filing an issue on

On Dec 11, 2013, at 11:51 AM, ngalarneau at wrote:

> Hi David,
> I have stylesheet SWITCHING working fine. I can switch between 2 different 
> stylesheets on disk without tearing down & rebuilding my Scene. To do this 
> I simply do:
>        scene.stylesheets.clear()
>        scene.stylesheets.add(differentStylesheet)
> and the changes show up immediately (I'm assuming those 2 lines cause a 
> .css recalculation & a pulse).
> I would like to get stylesheet RELOADING to work in my JavaFX 8 app. By 
> this I mean picking up changes in a single .css file. This would allow the 
> developers to tweak the stylesheet & reload to see the effects 
> immediately.
> Unfortunately, it feels like the Filename of the stylesheet is the Key in 
> a cache that isn't getting cleared by my code above. Nothing visible 
> happens when I do:
>        scene.stylesheets.clear()
>        scene.stylesheets.add(sameStylesheet)
> Given your description below, my impression is that RELOADING should also 
> work...
> Thank you for any suggestions,
> Neil
> From:   David Grieve <david.grieve at>
> To:     Werner Lehmann <lehmann at>
> Cc:     openjfx-dev at
> Date:   12/10/2013 11:10 AM
> Subject:        Re: Reloading stylesheets
> Sent by:        openjfx-dev-bounces at
> The way it works in 8.0 is that there is a cache of loaded stylesheets. 
> When a scene or parent adds a stylesheet, the stylesheet is added to the 
> cache. Any other scene or parent that uses the same stylesheet will get 
> the one from cache. If a scene or parent later removes the stylesheet, the 
> stylesheet is removed from the cache and the css style cache for any scene 
> or parent that referenced that stylesheet is cleared (since the set of 
> styles may have changed). Any scene or parent that referenced the now 
> removed stylesheet is told to reapply its styles. Since the stylesheet is 
> no longer in cache, it will be re-parsed (or reloaded if there is a binary 
> version of the stylesheet) when it is called for by a scene or parent.
> The way it worked in 2.x was an abomination.
> On Dec 10, 2013, at 10:30 AM, Werner Lehmann 
> <lehmann at> wrote:
>> Interesting. Assuming the stylesheets are still cached, how would it 
> know when to reload and not use the cached sheet? Or has sheet processing 
> been optimized so much that caching is not necessary anymore...
>> On 10.12.2013 16:15, Tom Schindl wrote:
>>> No on FX8 you need to remove and readd them! So the only thing 
> different
>>> is that you omit the reload-call on FX8.
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