DP44/enriched-qwen3-coder-next/Common/DTS.Common/Interface/Pagination.md

source_files, generated_at, model, schema_version, sha256

source_files	generated_at	model	schema_version	sha256
Common/DTS.Common/Interface/Pagination/IPaginationView.cs Common/DTS.Common/Interface/Pagination/IPaginationViewModel.cs Common/DTS.Common/Interface/Pagination/IFilterableListView.cs	2026-04-16T02:58:19.769706+00:00	Qwen/Qwen3-Coder-Next-FP8	1	627bd96c052ce4ba

Pagination

Documentation: Pagination and Filtering Infrastructure Interfaces

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1. Purpose

This module defines foundational interfaces for pagination and filtering UI patterns within the application’s view-layer architecture. Specifically, IPaginationView and IPaginationViewModel serve as marker interfaces to establish a contract between views and view models that support pagination (e.g., list views with page navigation), while IFilterableListView provides a standardized mechanism for applying and clearing text-based filters on list-like UI components. These interfaces are part of a layered design that enforces separation of concerns between UI presentation (IPaginationView, IFilterableListView) and state/logic (IPaginationViewModel), building upon the base IBaseView and IBaseViewModel contracts.

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2. Public Interface

IPaginationView

• Signature: public interface IPaginationView : IBaseView
• Behavior: A marker interface indicating that a view supports pagination. It inherits from IBaseView, implying it adheres to the base view contract (e.g., binding to a corresponding view model). No additional members are defined in this interface.

IPaginationViewModel

• Signature: public interface IPaginationViewModel : IBaseViewModel
• Behavior: A marker interface indicating that a view model manages pagination state (e.g., current page, total items, page size). Inherits from IBaseViewModel, implying it supports standard view model behaviors (e.g., property change notification). No additional members are defined.

IFilterableListView

• Signature: public interface IFilterableListView
• Behavior: Defines a contract for list views that support dynamic filtering.
  • void Filter(object tag, string term): Applies a filter using the provided term (search string) and tag (an opaque identifier, likely used to distinguish filter contexts or sources).
  • void ClearAllFilters(): Removes all active filters, restoring the list to its unfiltered state.
  • string ListViewId { get; }: A read-only identifier for the list view instance, likely used for logging, diagnostics, or filter scoping.

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3. Invariants

• IPaginationView and IPaginationViewModel:
  • Must be implemented together in a view/view model pair (e.g., a view implementing IPaginationView should bind to a view model implementing IPaginationViewModel).
  • Inheritance from IBaseView/IBaseViewModel implies adherence to base view/view model contracts (e.g., IBaseView likely requires a ViewModel property; IBaseViewModel likely implements INotifyPropertyChanged).
• IFilterableListView:
  • ListViewId must be non-null and stable for the lifetime of the instance.
  • Filter must be idempotent for identical (tag, term) pairs (though this is not explicitly guaranteed—see Gotchas).
  • ClearAllFilters must reset the view’s displayed items to the unfiltered state, regardless of prior filter calls.

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4. Dependencies

This module depends on:

• DTS.Common.Base namespace (specifically IBaseView and IBaseViewModel, referenced via using DTS.Common.Base;).
• No external libraries or system dependencies are evident from the source.

This module is depended on by:

• Any component implementing or consuming pagination/filtering functionality (e.g., UI controls, view model factories, or navigation logic).
• Since these are marker interfaces, dependencies are implicit and inferred from usage elsewhere in the codebase (not visible here).
• IFilterableListView is likely consumed by filter management services or controllers (e.g., a FilterService that orchestrates Filter/ClearAllFilters calls).

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5. Gotchas

• No implementation guidance: These interfaces are purely declarative (marker interfaces). Concrete behavior (e.g., how pagination state is managed or how filtering is implemented) is defined elsewhere—likely in concrete classes or services that implement these interfaces.
• IFilterableListView.Filter ambiguity: The purpose of the tag parameter is unclear from the interface alone. It may be used for:
  • Distinguishing multiple filter inputs on the same view (e.g., "search by name" vs. "search by ID").
  • Correlating filter operations with specific data sources or contexts.
  • Without seeing implementations, its semantics are unspecified.
• No thread-safety guarantees: The interface does not specify whether Filter/ClearAllFilters are thread-safe. Concurrent calls may lead to race conditions if the underlying implementation is not synchronized.
• No error handling contract: Exceptions thrown by Filter or ClearAllFilters (e.g., due to invalid term or tag) are not documented. Callers must assume undefined behavior on error.
• ListViewId uniqueness: While ListViewId must be non-null, its uniqueness across instances is not guaranteed by the interface. Conflicts may arise if IDs are not carefully managed.

None identified from source alone. (Note: This is a placeholder per instructions; the above gotchas are identified from source analysis.)