tegwick
50c68575f1
Assistant: codex Assistant-Model: gpt-6-astra Assistant-Session: 01a0cffe-206f-7323-89d3-b20ca4cf4bf9
39 lines
1.8 KiB
Markdown
39 lines
1.8 KiB
Markdown
---
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title: Presentation Model
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status: draft
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maturity: hypothesis
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families: [composition, affordance]
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scales: [L4, L6]
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admission: research-candidate-only
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---
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# Presentation Model
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Context: a screen contains presentation decisions that are difficult to exercise
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through widget APIs. Testability and reuse compete with binding complexity.
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Proposed solution: represent presentation state and decisions independently of the
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concrete controls; adapt that model into the view and translate interaction back
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into intents. Domain authority stays outside presentation decisions. Specify the
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binding direction and ownership of each editable value to avoid feedback loops.
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Result: logic can be tested without mounting the full interface, but model/view
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synchronization becomes another failure surface. This is broader than Local Draft
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State: a presentation model may contain selection and enablement without any draft.
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Do not create a second editable copy of every domain object by default.
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Evidence: B01 locates Fowler's named pattern and its synchronization trade-off.
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The source is a historical draft, not a verified deployment in this research.
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Alternative: keep a trivial screen's logic in its view; another controller style
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may be sufficient. Full-pattern recurrence here remains unverified.
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Proposed relations: may contain [Local Draft State](LocalDraftState.md) and compute
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[Derived State](DerivedState.md); neither is mandatory.
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Next test: edit, refresh and change selection; verify ownership of draft versus
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server observation and ensure a binding update does not trigger duplicate commands.
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Evidence locators: [breadth review](../reviews/PatternBreadthExpansion.md).
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All relations are research proposals; no canonical identity or admitted graph edges.
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The next test is planned, not executed. Known uses of the complete proposed contract
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have not been verified in this investigation.
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