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48da2ee5ae
Added a ScrollListener listener to Scrollable. The ScrollListener runs each time the Scrollable's scrollOffset changes. This can be used to keep overlay widgets in sync with a Scrollable below them. Removed the Scrollable ScrollClient API. It was no longer used and was clumsy to use as a ScrollListener. Added global function findScrollableAncestor() to scrollable.dart. Added examples/widgets/overlay_geometry.dart. The app's Scaffold is contained by a Stack. The Stack is used to display green overlay "Markers" at the corners of the most recently selected list item and where the corresponding tap occurred. The app uses widget.localToGlobal() to compute the global overlay positions of the markers. The ScrollListener is used to keep the markers' positions up to date.
Sky
Sky is a new way to build high performance, cross platform mobile apps. More specifically, Sky is a rendering engine, a scripting engine, an (optional) framework, and a (optional) set of Material Design widgets. Sky is optimized for today's, and tomorrow's, mobile devices. We are focused on low-latency input, high frame rates, and we are purely mobile first.
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For information about using Sky to build apps, please see Getting Started with Sky.
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For information about contributing to Sky, please see CONTRIBUTING.md.
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