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

source_files, generated_at, model, schema_version, sha256

source_files	generated_at	model	schema_version	sha256
Common/DTS.CommonCore/Interface/Pagination/IPaginationView.cs Common/DTS.CommonCore/Interface/Pagination/IPaginationViewModel.cs Common/DTS.CommonCore/Interface/Pagination/IFilterableListView.cs	2026-04-16T02:18:03.956026+00:00	Qwen/Qwen3-Coder-Next-FP8	1	17272f9179ee1d83

Pagination

Documentation: Pagination and Filtering Interfaces

1. Purpose

This module defines foundational interfaces for pagination and filtering functionality within the UI layer of the DTS system. Specifically, IPaginationView and IPaginationViewModel serve as marker interfaces to establish a contract for views and view models that support pagination, inheriting from IBaseView and IBaseViewModel respectively. Separately, IFilterableListView provides an explicit contract for list views that support dynamic filtering by term and tag, with identification via ListViewId. These interfaces enable consistent handling of pagination and filtering concerns across UI components, promoting separation of concerns between view logic (IPaginationView, IFilterableListView) and view model logic (IPaginationViewModel).

2. Public Interface

• IPaginationView
  Signature: public interface IPaginationView : IBaseView
  Behavior: A marker interface indicating that a view supports pagination. It inherits from IBaseView (from DTS.Common.Base), implying it adheres to base view contracts (e.g., lifecycle, binding context), but adds no additional members itself.

• IPaginationViewModel
  Signature: public interface IPaginationViewModel : IBaseViewModel
  Behavior: A marker interface indicating that a view model supports pagination. Inherits from IBaseViewModel, implying base view model responsibilities (e.g., state management, command exposure), but adds no additional members.

• IFilterableListView
  Signature: public interface IFilterableListView
  Behavior: Defines contract for a list view capable of filtering.

  • void Filter(object tag, string term): Applies a filter using a tag (e.g., column/field identifier) and term (user-provided filter string).
  • void ClearAllFilters(): Removes all active filters.
  • string ListViewId { get; }: Unique identifier for the list view instance, used for scoping filters or state.

3. Invariants

• IPaginationView and IPaginationViewModel are pure marker interfaces—they impose no runtime behavior beyond inheritance from their respective base interfaces (IBaseView, IBaseViewModel).
• IFilterableListView.Filter must be idempotent or statefully consistent: repeated calls with the same tag and term should not produce undefined behavior (e.g., duplicate filters), though exact semantics (overwrite vs. append) are not specified.
• IFilterableListView.ListViewId must return a non-null, stable identifier for the lifetime of the instance.
• IFilterableListView.ClearAllFilters() must reset the view’s filter state to its unfiltered condition.
• No ordering guarantees are specified for filter application or clearing (e.g., filters may be applied in any sequence).

4. Dependencies

• Dependencies of this module:

  • DTS.Common.Base.IBaseView (via IPaginationView)
  • DTS.Common.Base.IBaseViewModel (via IPaginationViewModel)
  • No other direct dependencies—interfaces are self-contained.

• Dependencies on this module:

  • UI components implementing pagination (e.g., views/view models for list pages) must implement IPaginationView/IPaginationViewModel.
  • List views requiring filtering capability must implement IFilterableListView.
  • Likely consumed by higher-level UI frameworks or pagination/filtering services (not visible in source), but such consumers are not declared here.

5. Gotchas

• Ambiguity in Filter semantics: The tag parameter’s type (object) and purpose (e.g., enum, string key, or custom identifier) are unspecified. Implementers must infer or document expected usage.
• No error handling contract: Filter and ClearAllFilters have no documented exception behavior (e.g., on invalid tag or during filter application).
• No state introspection: IFilterableListView exposes no way to query current filters (e.g., GetActiveFilters()), making debugging or UI state synchronization difficult.
• Namespace inconsistency: IFilterableListView resides in DTS.Common.Interface.Pagination, while IPaginationView and IPaginationViewModel are in DTS.Common.Interface (no .Pagination sub-namespace). This may cause discoverability issues.
• No versioning or extensibility hooks: Interfaces are minimal and lack extensibility (e.g., no Version property or Try* patterns), suggesting potential rigidity for future enhancements.

None identified beyond the above.