ScrollBar should defer some of its calculations when styles change to a lifecycle method so things that affect measurement have a chance to be measured.
Project: http://git-wip-us.apache.org/repos/asf/flex-sdk/repo Commit: http://git-wip-us.apache.org/repos/asf/flex-sdk/commit/9c5f91e5 Tree: http://git-wip-us.apache.org/repos/asf/flex-sdk/tree/9c5f91e5 Diff: http://git-wip-us.apache.org/repos/asf/flex-sdk/diff/9c5f91e5 Branch: refs/heads/master Commit: 9c5f91e5f25459c34b420c8596bb80adc5441498 Parents: 05833f8 Author: Alex Harui <aha...@apache.org> Authored: Thu Sep 5 09:52:36 2013 -0700 Committer: Alex Harui <aha...@apache.org> Committed: Thu Oct 10 23:18:37 2013 -0700 ---------------------------------------------------------------------- .../spark/src/spark/components/VScrollBar.as | 25 +++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/flex-sdk/blob/9c5f91e5/frameworks/projects/spark/src/spark/components/VScrollBar.as ---------------------------------------------------------------------- diff --git a/frameworks/projects/spark/src/spark/components/VScrollBar.as b/frameworks/projects/spark/src/spark/components/VScrollBar.as index 144a420..a8afadb 100644 --- a/frameworks/projects/spark/src/spark/components/VScrollBar.as +++ b/frameworks/projects/spark/src/spark/components/VScrollBar.as @@ -158,6 +158,8 @@ public class VScrollBar extends ScrollBarBase // //-------------------------------------------------------------------------- + private var maxAndPageSizeInvalid:Boolean = false; + private function updateMaximumAndPageSize():void { var vsp:Number = viewport.verticalScrollPosition; @@ -523,11 +525,28 @@ public class VScrollBar extends ScrollBarBase if (allStyles || styleName == "interactionMode") { if (viewport) - updateMaximumAndPageSize(); + { + // Some of the information needed + // is calculated in measure() on a child + maxAndPageSizeInvalid = true; + invalidateSize(); + } } } - - + + /** + * @private + */ + override protected function measure():void + { + super.measure(); + if (maxAndPageSizeInvalid) + { + maxAndPageSizeInvalid = false; + updateMaximumAndPageSize(); + } + } + /** * @private * Scroll vertically by event.delta "steps". This listener is added to both the scrollbar
