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Constraints On Trees And A Forest Of Other Problems

Constraints On Trees And A Forest Of Other Problems. Ian Smith Georgia Tech May 21, 1998. Story. Talk Terrain Map. Introduction. Approach. Flexible UIs. Media Spaces. “Mumbling”. Abstraction. State Preservation. Time. Relationships. JOB INTERVIEW. Text Width. Inner Width. Inner X.

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Constraints On Trees And A Forest Of Other Problems

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  1. Constraints On TreesAnd A Forest Of Other Problems Ian SmithGeorgia Tech May 21, 1998

  2. Story

  3. Talk Terrain Map Introduction Approach Flexible UIs Media Spaces “Mumbling” Abstraction State Preservation Time

  4. Relationships JOB INTERVIEW Text Width Inner Width Inner X

  5. High-Order Bit E A F C B B’ ... D D D ... D D C’

  6. This is not a constraint. • This is automatic relationship maintenance. • Not numerical constraints. • Not logic programming. • Propagation-based systems • Not solved “from scratch”

  7. Related Work • Sutherland’s Sketchpad • Borning’s DeltaBlue, SkyBlue, Indigo • Vander Zanden’s QuickPlan + studies • Hudson’s Eval/Vite • Myers and Guise’s KR solver • Patterson & Hill : AVL, etc. • Smalltalk’s active values

  8. UI Applications • User interfaces are trees • Roughly: one tree is one “window”

  9. A Bob Smith Steve McMan Ian Smith Alice Jones Tom Katt Kathy Wahl Chris Hopkins CTO Accounting President, CEO Distinguished Eng. CFO Director Of Eng. Director Of Finance Scenario: Org Hacker Org Hacker A& B Software Org Chart

  10. Chris Hopkins Steve McMan Kathy Wahl Alice Jones Bob Smith Tom Katt Ian Smith Distinguished Eng. Director Of Eng. CFO President, CEO CTO Accounting Director Of Finance Bad Design A& B Software Org Chart Pilot Display Area

  11. Improved Design Org Chart Reports To CEO, President (A. Jones) CTO (R. Smith) CFO (C. Tompkins)

  12. The Set-Up • Two (or more) different “views” • Each view is created/maintained by a tree • Views are different, but related • Interactors are not one to one • Overall shapes are different • Views change over time… • Declare constraints!

  13. Approach View 1 View2 Org Chart Reports To Ultraman President (John) VP of Eng. (Jane) Staff Eng. (Bill) VP of Finance (Fred) Window Pilot App Principal Sci. (Mary) Scroller Palette Scroller Tree Control ... Tree Node Line Rect Rect Tree Node Tree Node

  14. Ultraman

  15. Ultraman Design-Time • Tool for expressing relationships • Designer uses a pattern language • Language converted to a grammar • Grammar (and support code) compiled and linked with your app

  16. Ultraman Run-Time • After each event… • Source tree is flattened • Flattened form is “parsed” • New result tree “generated” by matching patterns • Screen updated

  17. “The Magic Finger”

  18. State-Preservation • “Generating” interface B from A implies no state local to A • Each time B changes A’s state gets “trampled” • E.g. State of the “open-close” objects on Pilot interface

  19. Incrementality • Given a small change in the source tree, make the correct, small change to the target tree C A A B C D E C

  20. Approach • “Generate” a new target tree each time… • Identify the nodes that are the same • Preserve those nodes that haven’t changed C C C A A A A + = B C D E E E C C C

  21. Sameness? • What does sameness mean? • Same location in the target tree? • Same type? • Result from the same constraint? • Result from the same object in the source tree? • Because they say so?

  22. Solution • Precompute where sensible • Three conditions on sameness: • Produced from the same constraint • Produced from the same portion of the source • Compatible types • If two nodes are the same, they are merged to preserve state

  23. Value Numbering • Bottom-up change metric run on the parse tree • Leave open possibility of VN on result tree • Technique derived from common subexpression elimination

  24. Fun Things To Do • Good library of constraints • Grammar analysis • Toolkit for audio display • User-controlled error handling • Lazy toolkits

  25. Flexible UIs • SubArctic -- Java UI toolkit • UI Toolkits are not a collection of widgets! • Building new interactions should be easy! • Built-in support for lenses (UIST ‘97) • Downloadable, dynamic styles (UIST ‘97) • Animation as a first class entity (UIST ‘93)

  26. Style

  27. SubArctic and Me • ~60K lines of code • Responsible for design and impl. of major API sections • Bug fixing • Documentation • Release Engineering • Student management

  28. Media Spaces • Media spaces : audio/video/textual environments for awareness • Privacy tradeoff • Cryptography helps... • Disturbance tradeoff

  29. Mumbling • “Mumbling” is a privacy tradeoff • Remove large amounts of information content • Leave some interesting, but not sensitive, bits in the stream • Audio: 1 integer per 500ms with an amplitude approximation

  30. Mumbling Video

  31. Thanks • Special thanks to my hosts:Mike SalisburySteve Cousins • Thanks to Alex Zhao & Keith for giving me some screen shots. • Thank you for coming! • Thanks to Ultraman...

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