[API REVIEW] RT-30576 Parent : add new public layout method, optimized to only layout this parent and it's children.

Jasper Potts jasper.potts at oracle.com
Tue May 28 09:16:04 PDT 2013

Hi All,

Seems like we have 3 use cases:

requestLayout()                 - my layout and/or my size has changed - action relayout myself and all parents
requestParentLayout()     - my size has changed only - layout my parents
requestLocalLayout()       - something requiring my children to be relayed out has happened but there is no change in my pref size - just mark this node dirty for layout next pulse

3) is a optimization for preventing excessive layout that makes sense.
2) I am not sure when this can happen. When can a region's size change without is children needing to be laid out? Or have I miss understood what it does?

Seems like we should look at all these extensions to layout API as one.


On May 22, 2013, at 8:15 AM, mick.fleming <mick.fleming at oracle.com> wrote:

> Hi Martin,
>> I would like to introduce similar call, see 
> it's a shame about the overlap, but at least I
> assume it means that we're in agreement that
> something can be done here :-)
> There does seem to be a a difference between the
> two. While your requestParentLayout doesn't clear
> the size cache, it does go up the hierarchy.
> My proposal is for a method that specifically
> doesn't request a layout up the hierarchy, and
> only sets the current Parent as dirty. There are
> cases where it's know that the change is only local.
> My change is aimed primarily at Controls and the like,
> for cases where they've changed their internals, and it's
> known that there is no knock-on effect.
> I have an implementation, that includes changes to
> Controls, Charts and Layout to utilize it.
> regards,
> mick

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