DP44/enriched-qwen3-coder-next/DataPRO/Modules/SystemSettings/PowerAndBattery/ViewModel.md

source_files, generated_at, model, schema_version, sha256

source_files	generated_at	model	schema_version	sha256
DataPRO/Modules/SystemSettings/PowerAndBattery/ViewModel/PowerAndBatteryViewModel.cs	2026-04-16T04:41:22.608181+00:00	Qwen/Qwen3-Coder-Next-FP8	1	734fcb6778e8ee9f

ViewModel

Documentation: PowerAndBatteryViewModel

1. Purpose

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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2. Public Interface

PowerAndBatteryViewModel Constructor

public PowerAndBatteryViewModel(
    IPowerAndBatteryView view, 
    IRegionManager regionManager, 
    IEventAggregator eventAggregator, 
    IUnityContainer unityContainer)

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.

Cleanup()

public void Cleanup()

No-op stub. Intended for cleanup logic (e.g., unsubscribing from events, releasing resources), but currently does nothing.

CleanupAsync()

public Task CleanupAsync()

Returns Task.CompletedTask. No-op stub for async cleanup.

Initialize()

public void Initialize()

No-op stub. Intended for initialization logic.

Initialize(object parameter)

public void Initialize(object parameter)

No-op stub. Intended for parameterized initialization.

Initialize(object parameter, object model)

public void Initialize(object parameter, object model)

No-op stub. Intended for initialization with both navigation parameter and domain model.

InitializeAsync()

public Task InitializeAsync()

Returns Task.CompletedTask. No-op stub for async initialization.

InitializeAsync(object parameter)

public Task InitializeAsync(object parameter)

Returns Task.CompletedTask. No-op stub for async parameterized initialization.

Activated()

public void Activated()

No-op stub. Likely intended for Prism INavigationAware.Activated lifecycle hook.

NotificationRequest

public InteractionRequest<Notification> NotificationRequest { get; }

Exposes a Prism InteractionRequest for triggering notification popups (e.g., informational messages). Triggered via OnRaiseNotification.

ConfirmationRequest

public InteractionRequest<Confirmation> ConfirmationRequest { get; }

Exposes a Prism InteractionRequest for confirmation dialogs (e.g., yes/no prompts). Currently unused in the source.

IsBusy

public bool IsBusy { get; set; }

Gets/sets the busy state. Bound to UI to show/hide a busy indicator. Set via OnBusyIndicatorNotification.

IsDirty

public bool IsDirty { get; private set; }

Read-only property indicating whether the view model’s state has unsaved changes. Always false in current implementation.

IsMenuIncluded

public bool IsMenuIncluded { get; set; }

Controls whether the main menu is visible in the view. Defaults to false.

IsNavigationIncluded

public bool IsNavigationIncluded { get; set; }

Controls whether navigation controls are visible in the view. Defaults to false.

HeaderInfo

public string HeaderInfo => "MainRegion";

Read-only property returning the literal string "MainRegion". Likely used for view header identification or region targeting.

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3. Invariants

• View.DataContext is always set to this during construction.
• IsBusy is updated synchronously via SetProperty when BusyIndicatorChangeNotification is raised.
• NotificationRequest is always initialized with a Notification object containing a NotificationContentEventArgs (with empty OkText and CancelText) and the original event’s Title.
• The view model is a shared singleton ([PartCreationPolicy(CreationPolicy.Shared)]), meaning only one instance exists per application lifetime.
• IsDirty is never set to true in the current implementation (always false).

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4. Dependencies

Dependencies on this module:

• IPowerAndBatteryView (interface) — the view bound to this view model.
• IPowerAndBatteryViewModel (interface) — the contract implemented by this class.
• PowerAndBattery namespace — the module’s own namespace (inferred from namespace PowerAndBattery).

Dependencies of this module:

• DTS.Common.Base — provides BasePropertyChanged (base class for property change notification).
• DTS.Common.Events — provides RaiseNotification, BusyIndicatorChangeNotification, NotificationContentEventArgs.
• DTS.Common.Interactivity — provides InteractionRequest<T> and related types (e.g., Notification, Confirmation).
• DTS.Common.Interface — likely contains interfaces like IPowerAndBatteryView, IPowerAndBatteryViewModel.
• Prism.Events — provides IEventAggregator and event types.
• Prism.Regions — provides IRegionManager.
• Unity — provides IUnityContainer.

Dependencies of this module’s consumers:

• Any consumer must provide IPowerAndBatteryView, IRegionManager, IEventAggregator, and IUnityContainer via DI.
• Consumers must publish RaiseNotification and BusyIndicatorChangeNotification events via IEventAggregator to interact with this view model.

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5. Gotchas

• Empty Cleanup()/Initialize() implementations: All lifecycle methods (Cleanup, Initialize*, Activated) are no-ops. This may indicate incomplete implementation or deferred logic.
• Unused ConfirmationRequest: Declared but never raised; may be leftover from scaffolding or future use.
• IsDirty never updated: Always false; if intended for dirty-state tracking, logic is missing.
• HeaderInfo is hardcoded: Returns "MainRegion" literally — may be fragile if region names change.
• Event handler naming mismatch: OnBusyIndicatorNotification is documented as handling RaiseNotification in its XML comment, but actually handles BusyIndicatorChangeNotification.
• 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.
• 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).

None identified beyond the above.