163 lines
7.5 KiB
Markdown
163 lines
7.5 KiB
Markdown
---
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source_files:
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- DataPRO/Modules/SystemSettings/PowerAndBattery/ViewModel/PowerAndBatteryViewModel.cs
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generated_at: "2026-04-16T04:41:22.608181+00:00"
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model: "Qwen/Qwen3-Coder-Next-FP8"
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schema_version: 1
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sha256: "734fcb6778e8ee9f"
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---
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# ViewModel
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## Documentation: PowerAndBatteryViewModel
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### 1. Purpose
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The `PowerAndBatteryViewModel` serves as the view model for the Power and Battery settings module within the application’s UI. It acts as the intermediary between the `IPowerAndBatteryView` and underlying system services (e.g., event aggregation, region navigation, dependency injection), enabling reactive UI behavior through Prism’s interaction patterns (e.g., notifications, busy indicators). It subscribes to global events (`RaiseNotification`, `BusyIndicatorChangeNotification`) to synchronize UI state (e.g., busy status, popup notifications) and exposes properties (`IsBusy`, `IsDirty`, `IsMenuIncluded`, etc.) that control view presentation. Though currently minimal in implementation, it is designed to support future power/battery-specific logic.
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---
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### 2. Public Interface
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#### `PowerAndBatteryViewModel` Constructor
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```csharp
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public PowerAndBatteryViewModel(
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IPowerAndBatteryView view,
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IRegionManager regionManager,
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IEventAggregator eventAggregator,
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IUnityContainer unityContainer)
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```
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Initializes the view model, assigns the provided `view` and sets its `DataContext` to `this`. Registers event subscriptions for `RaiseNotification` and `BusyIndicatorChangeNotification` events via `_eventAggregator`. Initializes `NotificationRequest` and `ConfirmationRequest` for Prism interaction patterns.
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#### `Cleanup()`
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```csharp
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public void Cleanup()
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```
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No-op stub. Intended for cleanup logic (e.g., unsubscribing from events, releasing resources), but currently does nothing.
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#### `CleanupAsync()`
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```csharp
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public Task CleanupAsync()
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```
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Returns `Task.CompletedTask`. No-op stub for async cleanup.
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#### `Initialize()`
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```csharp
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public void Initialize()
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```
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No-op stub. Intended for initialization logic.
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#### `Initialize(object parameter)`
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```csharp
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public void Initialize(object parameter)
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```
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No-op stub. Intended for parameterized initialization.
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#### `Initialize(object parameter, object model)`
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```csharp
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public void Initialize(object parameter, object model)
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```
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No-op stub. Intended for initialization with both navigation parameter and domain model.
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#### `InitializeAsync()`
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```csharp
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public Task InitializeAsync()
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```
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Returns `Task.CompletedTask`. No-op stub for async initialization.
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#### `InitializeAsync(object parameter)`
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```csharp
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public Task InitializeAsync(object parameter)
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```
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Returns `Task.CompletedTask`. No-op stub for async parameterized initialization.
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#### `Activated()`
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```csharp
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public void Activated()
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```
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No-op stub. Likely intended for Prism `INavigationAware.Activated` lifecycle hook.
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#### `NotificationRequest`
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```csharp
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public InteractionRequest<Notification> NotificationRequest { get; }
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```
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Exposes a Prism `InteractionRequest` for triggering notification popups (e.g., informational messages). Triggered via `OnRaiseNotification`.
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#### `ConfirmationRequest`
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```csharp
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public InteractionRequest<Confirmation> ConfirmationRequest { get; }
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```
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Exposes a Prism `InteractionRequest` for confirmation dialogs (e.g., yes/no prompts). Currently unused in the source.
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#### `IsBusy`
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```csharp
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public bool IsBusy { get; set; }
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```
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Gets/sets the busy state. Bound to UI to show/hide a busy indicator. Set via `OnBusyIndicatorNotification`.
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#### `IsDirty`
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```csharp
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public bool IsDirty { get; private set; }
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```
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Read-only property indicating whether the view model’s state has unsaved changes. Always `false` in current implementation.
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#### `IsMenuIncluded`
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```csharp
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public bool IsMenuIncluded { get; set; }
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```
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Controls whether the main menu is visible in the view. Defaults to `false`.
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#### `IsNavigationIncluded`
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```csharp
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public bool IsNavigationIncluded { get; set; }
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```
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Controls whether navigation controls are visible in the view. Defaults to `false`.
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#### `HeaderInfo`
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```csharp
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public string HeaderInfo => "MainRegion";
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```
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Read-only property returning the literal string `"MainRegion"`. Likely used for view header identification or region targeting.
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---
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### 3. Invariants
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- `View.DataContext` is always set to `this` during construction.
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- `IsBusy` is updated synchronously via `SetProperty` when `BusyIndicatorChangeNotification` is raised.
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- `NotificationRequest` is always initialized with a `Notification` object containing a `NotificationContentEventArgs` (with empty `OkText` and `CancelText`) and the original event’s `Title`.
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- The view model is a shared singleton (`[PartCreationPolicy(CreationPolicy.Shared)]`), meaning only one instance exists per application lifetime.
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- `IsDirty` is never set to `true` in the current implementation (always `false`).
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---
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### 4. Dependencies
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#### Dependencies *on* this module:
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- `IPowerAndBatteryView` (interface) — the view bound to this view model.
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- `IPowerAndBatteryViewModel` (interface) — the contract implemented by this class.
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- `PowerAndBattery` namespace — the module’s own namespace (inferred from `namespace PowerAndBattery`).
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#### Dependencies *of* this module:
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- `DTS.Common.Base` — provides `BasePropertyChanged` (base class for property change notification).
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- `DTS.Common.Events` — provides `RaiseNotification`, `BusyIndicatorChangeNotification`, `NotificationContentEventArgs`.
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- `DTS.Common.Interactivity` — provides `InteractionRequest<T>` and related types (e.g., `Notification`, `Confirmation`).
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- `DTS.Common.Interface` — likely contains interfaces like `IPowerAndBatteryView`, `IPowerAndBatteryViewModel`.
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- `Prism.Events` — provides `IEventAggregator` and event types.
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- `Prism.Regions` — provides `IRegionManager`.
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- `Unity` — provides `IUnityContainer`.
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#### Dependencies *of* this module’s consumers:
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- Any consumer must provide `IPowerAndBatteryView`, `IRegionManager`, `IEventAggregator`, and `IUnityContainer` via DI.
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- Consumers must publish `RaiseNotification` and `BusyIndicatorChangeNotification` events via `IEventAggregator` to interact with this view model.
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---
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### 5. Gotchas
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- **Empty `Cleanup()`/`Initialize()` implementations**: All lifecycle methods (`Cleanup`, `Initialize*`, `Activated`) are no-ops. This may indicate incomplete implementation or deferred logic.
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- **Unused `ConfirmationRequest`**: Declared but never raised; may be leftover from scaffolding or future use.
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- **`IsDirty` never updated**: Always `false`; if intended for dirty-state tracking, logic is missing.
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- **`HeaderInfo` is hardcoded**: Returns `"MainRegion"` literally — may be fragile if region names change.
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- **Event handler naming mismatch**: `OnBusyIndicatorNotification` is documented as handling `RaiseNotification` in its XML comment, but actually handles `BusyIndicatorChangeNotification`.
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- **`NotificationContentEventArgs` construction**: The `OnRaiseNotification` handler creates a new `NotificationContentEventArgs` with empty `OkText` and `CancelText` fields — this may be intentional (e.g., to suppress confirmation buttons) but is not documented.
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- **Thread safety**: `OnBusyIndicatorNotification` uses `ThreadOption.PublisherThread`, but `OnRaiseNotification` uses the default (likely background thread). If UI updates occur in `OnRaiseNotification`, this could cause cross-thread exceptions (though `NotificationRequest.Raise` likely marshals to UI thread).
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None identified beyond the above. |