54 lines
4.4 KiB
Markdown
54 lines
4.4 KiB
Markdown
---
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source_files:
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- Common/DTS.Common/Interface/DownloadData/IDownloadDataViewModel.cs
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- Common/DTS.Common/Interface/DownloadData/IDownloadDataView.cs
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generated_at: "2026-04-16T03:02:12.391672+00:00"
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model: "Qwen/Qwen3-Coder-Next-FP8"
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schema_version: 1
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sha256: "3857b1f2c6bb9615"
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---
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# DownloadData
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## 1. Purpose
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This module defines the core view-model and view interfaces for the *Download Data* feature within the DTS (Data Transfer System) application. It establishes the contract between the UI layer (view) and the presentation logic layer (view-model) for handling download-related data operations, following the MVVM (Model-View-ViewModel) pattern. The interfaces `IDownloadDataView` and `IDownloadDataViewModel` serve as minimal extension points of base abstractions (`IBaseView` and `IBaseViewModel`), indicating that the feature currently relies on shared base functionality rather than defining feature-specific members at this layer.
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## 2. Public Interface
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No public interface members are defined *in these files* beyond inheritance. Both interfaces are empty (marker interfaces) with no declared properties, methods, or events.
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- **`IDownloadDataViewModel`**
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*Inherits from:* `IBaseViewModel`
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*Definition:* `public interface IDownloadDataViewModel : IBaseViewModel`
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*Behavior:* Serves as the contract for the view-model implementing download-data presentation logic. No additional members are declared here; all behavior must be defined in the base interface or concrete implementations.
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- **`IDownloadDataView`**
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*Inherits from:* `IBaseView`
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*Definition:* `public interface IDownloadDataView : IBaseView`
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*Behavior:* Serves as the contract for the UI view (e.g., a XAML page or control) responsible for rendering download data. No additional members are declared here; binding and interaction logic is expected to be provided via `IBaseView`.
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> **Note:** Since both interfaces are empty, their concrete implementations (not included in the provided source) must define all feature-specific behavior.
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## 3. Invariants
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- `IDownloadDataViewModel` must be implemented by a class that also satisfies `IBaseViewModel`’s contract (e.g., likely includes `INotifyPropertyChanged` support or equivalent state management).
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- `IDownloadDataView` must be implemented by a class that also satisfies `IBaseView`’s contract (e.g., likely includes binding context or view-model association).
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- The two interfaces are intended to be paired: a concrete `IDownloadDataView` implementation should bind to an instance of a class implementing `IDownloadDataViewModel`.
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- No additional validation rules or ordering guarantees are specified in the provided source.
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## 4. Dependencies
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- **Depends on:**
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- `DTS.Common.Base.IBaseViewModel` (via `IDownloadDataViewModel`)
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- `DTS.Common.Base.IBaseView` (via `IDownloadDataView`)
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- `System` (implicit, via `using` directive and base interfaces)
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- **Depended on by:**
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- Unknown from source alone. Likely consumed by:
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- A DI container registration module (e.g., registering `IDownloadDataViewModel` → concrete view-model type)
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- A view factory or navigation service (e.g., resolving `IDownloadDataView` for screen navigation)
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- Concrete implementations of `IDownloadDataView` and `IDownloadDataViewModel` in UI and logic layers, respectively.
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## 5. Gotchas
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- **Empty interfaces may indicate incomplete design or future extensibility:** The lack of declared members suggests either (a) the feature is nascent and interfaces are placeholders, (b) all required functionality is delegated to `IBaseViewModel`/`IBaseView`, or (c) feature-specific members were intentionally deferred to concrete types.
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- **Risk of overloading base interfaces:** If `IBaseViewModel`/`IBaseView` are heavily used across the system, confusion may arise about where download-specific logic resides.
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- **No explicit binding contract:** Since no properties (e.g., `DownloadItems`, `IsDownloading`) are declared, consumers must rely on runtime binding or undocumented conventions, increasing risk of binding errors.
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- **Namespace inconsistency:** `IDownloadDataViewModel` resides in `DTS.Common`, while `IDownloadDataView` resides in `DTS.Common.Interface`—this may cause discoverability issues or suggest inconsistent architectural layering.
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- **None identified from source alone** — *if* the above are considered expected design choices rather than gotchas. |