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Advanced webOS, Stanford
- 2. Advanced webOS Justin Tulloss Sr. Software Engineer April 24, 2010
- 3. Overview • Multi-Stage basics •Dashboards • Popups • Relaunching • The Future • Q&A
- 4. Why is thisso complicated? The web isn’t designed for multi-window apps • Big departure from normal browser behavior • webOS offers a lot of different interactions • Performance issues led to complications • Expected globals (document, window, etc.) • Late recognition of the problem by Palm. Sorry.
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- 6. Things to consider •Do you need another stage? Every time? • What is the most appropriate stage type? • How often do you rely on globals? • Prototype, jquery, document? • What state is shared between children?
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- 8. From a sceneassistant
- 9. Stage Types • Card •Dashboard • Popup
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- 16. Some new twists •Refactor child stage assistant to be generic • Not all stylesheets are loaded • Some styles are changed to assume a notification • Popups can have their height specified • Closing child windows is easy
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- 18. Example: Pushing dashboardscene moved
- 19. Example: Creating apopup
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- 22. Example: Very simplepopup
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- 24. Relaunching basics • Certainactions cause your app to be “relaunched” • The appManager service passes in arguments • Your AppAssistant can change default launch behavior • You should never have to worry about whether or not your app was already open
- 25. AppAssistant • Shared acrossall child stages • Handles relaunching • Convenient place to stick shared state • Try not to share state.
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- 28. Example: Launch Parametersin banner
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- 30. Upcoming API improvements •Default dashboards no longer require markup boilerplate • Just provide an icon, some text, and a count • Handles going from single item to multiple • SingletonStages • No more stageProxy shenanigans. • Failure cases are handled more elegantly
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