[API Review]: Node validation

Phil Race philip.race at oracle.com
Wed Jul 3 07:28:47 PDT 2013

I think SceneBuilder would like this, and I know printing would love it :-)


On 7/3/13 7:03 AM, Kevin Rushforth wrote:
> +1
> This would allow apps to dispense with the following workaround when 
> taking a snapshot:
>    // create a dummy scene so layout and CSS will work
>    new Scene(new Group(node));
>    node.shapshot(...)
> -- Kevin
> David Grieve wrote:
>> Hi Martin,
>> With regard to having this work without a Scene…
>> I think having a method that would layout a node without the node 
>> actually having to be part of the scene-graph would be _very_ 
>> useful.  Often times, developers will do the show-hide trick or 
>> add-remove trick to get a node's bounds before the node is shown for 
>> real. SceneBuilder has to do tricks like these to deal with popup 
>> controls, like tooltip.
>> What styles are applied from CSS depends on where the node is in the 
>> scene-graph, so the method would need to be 'if I add this node to 
>> this parent, what will be the node's bounds?'. To make this work on 
>> the CSS side would require decoupling the 'css graph' from the 
>> scene-graph. RT-30894 touches on that.
>> On Jul 3, 2013, at 8:33 AM, Martin Sladecek 
>> <martin.sladecek at oracle.com> wrote:
>>> Hi,
>>> JIRA: https://javafx-jira.kenai.com/browse/RT-31133
>>> I propose a single method "public final void validate()" to be added 
>>> to Node class. The validate method would ensure that the metrics 
>>> (layout bounds) of the Node are valid with regards to the current 
>>> scenegraph (CSS & layout).
>>> Together with this change, Parent.layout() will be deprecated.
>>> In my current implementation, validate() method works only if the 
>>> Node is in a Scene. To make it work without a Scene, we'd need to do 
>>> do some small adjustments to CSS (doesn't work with getScene() == 
>>> null). But I'm not sure if such feature would be useful.
>>> Regards,
>>> -Martin

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