
Drawer doesn't need a SizeObserver, since it only looks at the size in event handlers. It can just go and probe the tree to read the size. Also, change from using _kEdgeDragWidth to using _kWidth when figuring out how much of the drawer to show when dragging it from the edge, since that is more likely to match the drawer's width.
Flutter
Flutter is a new way to build high-performance, cross-platform mobile apps. Flutter is optimized for today's, and tomorrow's, mobile devices. We are focused on low-latency input and high frame rates on Android and iOS.
Flutter is an early-stage open-source project. We are still missing core features like accessibility, text input, localization, and more. However, you can build demos and examples today. We hope you try it out and send us feedback.
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For information about using Flutter to build apps, please see the getting started guide.
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For information about contributing code to Flutter itself, please see CONTRIBUTING.md.
Community
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