The JavaDoc for RequiresResize says that that instanceof check in onResize
if the correct way to to it. An instanceof check should be very fast, and
almost negligible compared to the cost of actually doing layout. If
somebody notices a performance regression, its easy enough to use a boolean,
but
I want to remark something but mine is more a question than a suggestion:
I assume OnResize would have to be quite performant. How expensive is the
operator instanceof? Is it worth keeping an instance boolean when the child
is initialized and check against it later? Or would that be seen more like
Reviewers: sbrubaker,
Description:
Making Composite implement RequiresResize and ProvidesResize so that it
can pass resize information to its child widget. This is useful when
creating a Composite of a LayoutPanel. In general, a widget should only
ProvideResize if its child widget cannot affect
