Event when CSS is applied

[David Grieve]

On 2/17/15 8:02 AM, Tom Eugelink wrote:
> I have a skin (of a control) that centers a Text node. This Text node 
> can be styled via CSS, so this styling is a factor when centering. 
> because larger font means wider text.
>
> The centering works perfectly, the only problem is figuring out when 
> to center the node. At the moment I'm centering the node on every 
> layoutChildren call of the skin, but this is way to often, because 
> after applying the CSS chances are very low that the node will need to 
> be repositioned.
>
> Basically I would like to be informed when the styling of a node has 
> been applied or changed. Is there some place that can provide this 
> information?
>
Not in general, no. But you can add a listener to a property that is 
styled by CSS and react to the change. You might add a listener to the 
Text node's fontProperty, for example. Clearly this isn't an all-purpose 
solution. Another approach is to hold onto the bounds (or maybe just the 
pref width and height) of the child node. If the old bounds doesn't 
equal the new bounds, then recenter.