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DP44/enriched-partialglm/DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.TestModification/ViewModel.md
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2026-04-17 14:55:32 -04:00

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DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.TestModification/ViewModel/TestModificationViewModel.cs
2026-04-16T11:08:10.828283+00:00 zai-org/GLM-5-FP8 1 297454e79e1ccbbd

Documentation: TestModificationViewModel

1. Purpose

TestModificationViewModel is a Prism-based ViewModel responsible for managing test data modifications within the DTS Viewer application. It provides functionality to modify channel properties such as T0 (time zero), sensitivity, line fit, EU multipliers/offsets, filters, and data flags. The module interfaces with the sensor database to retrieve and update calibration records, and coordinates with the broader application via event aggregation for channel selection, T0 shifting, and modification state synchronization.

2. Public Interface

Constructor

public TestModificationViewModel(
    ITestModificationView view, 
    IRegionManager regionManager, 
    IEventAggregator eventAggregator, 
    IUnityContainer unityContainer)

Initializes the ViewModel, sets up the View's DataContext, creates interaction requests, and subscribes to RaiseNotification, GraphSelectedChannelsNotification, ShiftT0Event, and SetUseZeroForUnfilteredEvent events.

Public Methods

Method Signature Description
Initialize void Initialize() Override; no-op implementation.
Initialize void Initialize(object parameter) Override; sets Parent property from parameter cast to IBaseViewModel.
UpdateDatabaseMethod void UpdateDatabaseMethod() Updates calibration in the sensor database. Sets CalibrationId to -1, updates ModifyDate to current time, creates a new SensorCalibration, inserts via DbOperations.SensorCalibrationsInsert, and refreshes Model.Cal with latest calibration. Publishes PageErrorEvent on failure.
PublishChanges void PublishChanges() If Model.IsModifiedDataFlag is true, saves data flag modification immediately via TestModelManipulation.SaveModificationDataFlag. Publishes TestModificationChangedEvent with the Model.

Public Properties

Property Type Description
View ITestModificationView Gets/sets the associated View.
Parent IBaseViewModel Gets/sets the parent ViewModel.
NotificationRequest InteractionRequest<Notification> Interaction request for displaying notifications.
ConfirmationRequest InteractionRequest<Confirmation> Interaction request for displaying confirmations.
PreviewCommand DelegateCommand Executes PreviewMethod() - calls TestModelManipulation.PreviewLineFit(Model).
WriteCommand DelegateCommand Executes WriteMethod() - validates T0, prompts user, calls TestModelManipulation.SaveModification.
UndoCommand DelegateCommand Executes UndoMethod() - prompts user, calls TestModelManipulation.UndoModification.
UndoAllCommand DelegateCommand Executes UndoAllMethod() - prompts user, calls TestModelManipulation.UndoAllModification.
UseISOCodeFilterMapping bool Controls whether ISOCode field filter matches channel's SoftwareFilter. Default: false.
Model TestModificationModel The model containing test modification state. Setter updates Parent reference.
UseZeroForUnfiltered bool Gets/sets whether to use zero for unfiltered values.
IsFilterEnabled bool Gets/sets filter enabled state. Raises OnPropertyChanged.
TestModificationVisability bool Controls visibility of test modification UI. Raises OnPropertyChanged.
HeaderInfo string Returns "TestSummaryRegion".
IsBusy bool Gets/sets busy state. Raises OnPropertyChanged.
IsDirty bool Gets/sets dirty state.
IsNavigationIncluded bool Gets/sets navigation inclusion state.
IsBackedUp bool Gets (private sets) whether backup exists. Raises OnPropertyChanged.

Events

Event Type Description
PropertyChanged PropertyChangedEventHandler Raised when a property value changes.

3. Invariants

  1. Single-Channel Selection: TestModificationVisability is true only when exactly one channel is selected (channels.Count == 1 && channels.Count(x => x.IsSelected) == 1).

  2. T0 Validation: T0 cannot be shifted beyond the bounds of the test dataset. Model.ValidateT0() must return true before write operations proceed.

  3. Calibration ID Reset: When updating the database via UpdateDatabaseMethod(), CalibrationId is always set to -1 before insertion.

  4. Analog Sensor Calibration Display: Calibration records are only loaded/displayed for sensors where SensorType == 0 (analog sensors).

  5. Calibration Sorting: Calibrations are sorted ascending by CalibrationDate, then by ModifyDate as a tiebreaker. The "latest" calibration is the last element after sorting.

  6. Permission-Based Controls: All edit controls (EnableSensitivityControl, EnableLineFitControl, EnableDescriptionControl, EnableEUMultiplierControl, EnableEUOffsetControl, EnableFilterControl, IsT0Enabled, IsDataFlagEnabled) are gated by viewModel.DoesUserHaveEditPermission.

4. Dependencies

This Module Depends On:

  • DTS.Common.Base - BaseViewModel<T>
  • DTS.Common.Events - Event types (PageErrorEvent, RaiseNotification, GraphSelectedChannelsNotification, ShiftT0Event, SetUseZeroForUnfilteredEvent, TestModificationChangedEvent, ShowT0CursorEvent)
  • DTS.Common.Interactivity - InteractionRequest<T>, Notification, Confirmation
  • DTS.Common.Interface - IBaseViewModel, ITestModificationViewModel, ITestModificationView, IViewerMainViewModel
  • DTS.Common.Interface.Sensors - ISensorDbRecord, ISensorCalDbRecord
  • DTS.Common.Settings - SettingsDB, Keys
  • DTS.Common.Storage - (content not visible, inferred from namespace)
  • DTS.Common.Utilities.Logging - APILogger
  • DTS.SensorDB - DbOperations, SensorCalibration
  • DTS.Viewer.ChartOptions.Model - (content not visible)
  • DTS.Viewer.TestModification.Model - TestModificationModel, TestModelManipulation
  • Prism.Commands - DelegateCommand
  • Prism.Events - IEventAggregator
  • Prism.Regions - IRegionManager
  • Unity - IUnityContainer

What Depends On This Module:

  • Not determinable from source alone. Inferred consumers would be the View (TestModificationView) and the main application shell via region navigation.

5. Gotchas

  1. Typo in Property Name: TestModificationVisability is misspelled (should be "Visibility"). This may cause confusion when referencing the property.

  2. Malformed XML Comment: The GetLatestCalibration method has a malformed XML comment with <summary> used as both opening and closing tag instead of </summary>.

  3. Silent Exception Swallowing: GetLatestCalibration catches all exceptions and returns null without logging. The comment explicitly states: "there's no access to APILogger here, so rather than adding a reference, just eat the error".

  4. Member Hiding with new Keyword: Several members (OnPropertyChanged, PropertyChanged, IsBusy, IsDirty, IsNavigationIncluded) use the new keyword to hide base class members, which can lead to unexpected behavior when casting to base types.

  5. Yoda Condition Style: The codebase uses Yoda conditions (null == sensor instead of sensor == null) consistently throughout.

  6. Hardcoded Calibration ID: cal.CalibrationId = -1 is used as a marker for new calibrations. The significance of -1 is not documented in code.

  7. Static IsPopulating Property: IsPopulating is a static property used to prevent PublishChanges from executing during model population, which could cause issues if multiple instances exist.

  8. Feature Request Reference: A comment references an internal case URL: http://manuscript.dts.local/f/cases/43735/ for the database update feature.

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