122 lines
6.5 KiB
Markdown
122 lines
6.5 KiB
Markdown
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---
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source_files:
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- DataPRO/Modules/TestSetups/Diagnostics/ViewModel/DiagnosticsViewModel.cs
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generated_at: "2026-04-16T04:50:48.729446+00:00"
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model: "Qwen/Qwen3-Coder-Next-FP8"
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schema_version: 1
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sha256: "ea1f4ae58f807074"
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---
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# ViewModel
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## Documentation: `DiagnosticsViewModel`
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---
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### 1. **Purpose**
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The `DiagnosticsViewModel` class serves as the view model for the Diagnostics module within the application’s UI, implementing the `IDiagnosticsViewModel` interface. It acts as the intermediary between the diagnostics view (`IDiagnosticsTreeView`) and underlying system services (e.g., event aggregation, region management, dependency injection), enabling UI interaction patterns such as notifications and busy-state indication. It subscribes to global events (`RaiseNotification`, `BusyIndicatorChangeNotification`) to synchronize UI state (e.g., `IsBusy`, `IsMenuIncluded`) and trigger interactive popups via Prism’s `InteractionRequest` mechanism. Though currently minimal in logic, it provides the foundational structure for future diagnostics functionality.
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---
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### 2. **Public Interface**
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#### `public IDiagnosticsTreeView View { get; set; }`
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*Alias:* `TreeView` (see below).
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The view instance bound to this view model. Set during construction and used to establish data context.
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#### `public IDiagnosticsTreeView TreeView { get; set; }`
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Explicitly named property (redundant with `View`). Holds the reference to the diagnostics tree view.
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#### `public bool IsDirty { get; private set; }`
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Read-only property indicating whether the view model’s state has unsaved changes. Currently never set to `true` in the source.
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#### `public bool IsBusy { get; set; }`
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Public property that reflects whether a long-running operation is in progress. Raises `PropertyChanged` when changed.
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#### `public bool IsMenuIncluded { get; set; }`
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Controls whether the menu UI element should be rendered. Raises `PropertyChanged` on change.
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#### `public bool IsNavigationIncluded { get; set; }`
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Controls whether the navigation UI element should be rendered. Raises `PropertyChanged` on change.
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#### `public event PropertyChangedEventHandler PropertyChanged`
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Standard `INotifyPropertyChanged` implementation. Used by `OnPropertyChanged`.
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#### `public void OnPropertyChanged(string propertyName)`
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Raises the `PropertyChanged` event for the specified property name.
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#### `public InteractionRequest<Notification> NotificationRequest { get; }`
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Prism interaction request used to trigger notification popups (e.g., alerts, messages). Raised via `OnRaiseNotification`.
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#### `public InteractionRequest<Confirmation> ConfirmationRequest { get; }`
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Prism interaction request for confirmation dialogs (currently unused in the source).
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#### `public void Unset()`
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No-op stub. Intended for cleanup before view model is detached.
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#### `public void Cleanup()`
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No-op stub. Intended for synchronous cleanup.
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#### `public Task CleanupAsync()`
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Returns `Task.CompletedTask`. No-op stub for asynchronous cleanup.
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#### `public void Initialize()`
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No-op stub. Part of Prism’s `INavigationAware` / `IInitialize` pattern.
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#### `public void Initialize(object parameter)`
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No-op stub.
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#### `public void Initialize(object parameter, object model)`
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No-op stub.
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#### `public Task InitializeAsync()`
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Returns `Task.CompletedTask`. No-op stub.
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#### `public Task InitializeAsync(object parameter)`
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Returns `Task.CompletedTask`. No-op stub.
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#### `public void Activated()`
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No-op stub. Likely part of Prism’s `INavigationAware` or region lifecycle.
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---
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### 3. **Invariants**
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- `TreeView` must be non-null after construction (set in constructor).
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- `IsBusy` must be set only via its property setter (which triggers `OnPropertyChanged("IsBusy")`).
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- `IsMenuIncluded` and `IsNavigationIncluded` must be set only via their property setters (which trigger `OnPropertyChanged`).
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- `NotificationRequest` and `ConfirmationRequest` are initialized exactly once in the constructor.
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- Event subscriptions (`RaiseNotification`, `BusyIndicatorChangeNotification`) are established in the constructor and never unsubscribed (potential memory leak risk).
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- `OnRaiseNotification` constructs a *new* `NotificationContentEventArgs` with empty strings for `Header` and `Footer`, preserving only `Message`, `Image`, and `Title`.
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---
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### 4. **Dependencies**
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#### **Imports / Dependencies Used**
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- `DTS.Common.Events` → Provides `RaiseNotification`, `BusyIndicatorChangeNotification`, and `NotificationContentEventArgs`.
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- `DTS.Common.Interface.TestSetups.Diagnostics` → Defines `IDiagnosticsTreeView` and `IDiagnosticsViewModel`.
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- `Prism.Events` → Provides `IEventAggregator`, `EventAggregator`, and event types.
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- `Prism.Regions` → Provides `IRegionManager`.
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- `Unity` → Provides `IUnityContainer`.
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- `System.ComponentModel`, `System.Threading.Tasks` → Standard .NET interfaces and async support.
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#### **Consumers (Inferred)**
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- The view (`IDiagnosticsTreeView`) binds to this view model (via `TreeView.DataContext = this`).
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- External components publish `RaiseNotification` and `BusyIndicatorChangeNotification` events via `IEventAggregator`, which this view model consumes.
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- Likely registered as a singleton (`[PartCreationPolicy(CreationPolicy.Shared)]`) and injected via Unity.
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---
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### 5. **Gotchas**
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- **No-op lifecycle methods**: All `Initialize*`, `Cleanup*`, and `Activated` methods are empty stubs. Behavior is not implemented despite being part of Prism’s expected patterns.
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- **Event subscription leak**: Subscriptions to `_eventAggregator.GetEvent<...>().Subscribe(...)` are not disposed or unsubscribed. If the view model is long-lived or recreated frequently, this may cause memory leaks or duplicate handlers.
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- **Redundant `View` and `TreeView` properties**: Both `View` and `TreeView` are exposed and refer to the same object. This duplication is confusing and suggests possible refactoring debt.
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- **Unused `ConfirmationRequest`**: Declared but never used. May indicate incomplete implementation.
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- **`IsDirty` never set to `true`**: The property exists but is never updated, rendering it non-functional.
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- **`OnRaiseNotification` mutates event args**: A new `NotificationContentEventArgs` is created with empty `Header` and `Footer`, discarding original values. This may be intentional (e.g., to sanitize content), but is not documented.
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- **No command bindings**: The `#region Commands` section is empty. If commands are expected (e.g., for button clicks), they are not implemented here.
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> **None identified from source alone** for *behavioral correctness* beyond the above.
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