62 lines
5.3 KiB
Markdown
62 lines
5.3 KiB
Markdown
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---
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source_files:
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- Common/DTS.Common.Property/Model/GraphPropertyObject.cs
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generated_at: "2026-04-16T03:28:40.550784+00:00"
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model: "Qwen/Qwen3-Coder-Next-FP8"
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schema_version: 1
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sha256: "9e6ad0b9e1f98318"
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---
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# Model
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### **Purpose**
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`GraphPropertyObject` is a data model class designed to expose a standardized set of graph-related metadata properties for display and editing in a WPF PropertyGrid control (specifically, the Xceed WPF Toolkit PropertyGrid). It serves as a base or shared model for objects whose properties need to be presented in a structured, categorized UI—typically for configuration, debugging, or visualization of graph elements (e.g., nodes, edges, or signal traces in a DTS system). The class encapsulates user-facing metadata such as description, filtering criteria, data flags, and engineering unit (EU) conversion parameters, enabling consistent property browsing without requiring custom UI logic.
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---
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### **Public Interface**
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All members are instance properties; no methods or nested types are defined.
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| Property | Type | Attributes | Description |
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|----------|------|------------|-------------|
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| `Description` | `string` | `[Category("Action")]`, `[DisplayName("Description")]`, `[Description("This property uses a TextBox as the default editor.")]` | Free-text description of the graph element. |
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| `Filter` | `string` | `[Category("Action")]`, `[DisplayName("Filter")]`, `[Description("This property uses a TextBox as the default editor.")]`, `[ItemsSource(typeof(CFCFilterItemSource))]` | Filter string (likely for narrowing displayed data). Uses `CFCFilterItemSource` as a source for dropdown suggestions (though the actual `CFCFilterItemSource` type is not defined in this file). |
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| `DataFlag` | `string` | `[Category("Information")]`, `[DisplayName("Data Flag")]`, `[Description("This property uses a TextBox as the default editor.")]` | A flag indicating data status or type (e.g., "Valid", "Stale"). |
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| `ShiftT0` | `double` | `[Category("Information")]`, `[DisplayName("Shift T0 (ms)")]`, `[Description("This property uses a TextBox as the default editor.")]` | Time shift offset applied to the signal’s time base, in milliseconds. |
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| `EuMultiplier` | `double` | `[Category("Information")]`, `[DisplayName("EU Multiplier")]`, `[Description("This property uses a TextBox as the default editor.")]` | Multiplicative factor for converting raw values to engineering units. |
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| `EuOffset` | `double` | `[Category("Information")]`, `[DisplayName("EU Offset")]`, `[Description("This property uses a TextBox as the default editor.")]` | Additive offset for converting raw values to engineering units. |
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> **Note**: All properties use `TextBox` editors by default in the PropertyGrid. The `ItemsSource` attribute on `Filter` implies integration with `CFCFilterItemSource`, but its implementation is not included here.
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---
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### **Invariants**
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- No explicit validation or invariants are enforced in the class itself (e.g., no null checks, range validation, or required fields).
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- All properties are publicly gettable/settable; no immutability guarantees.
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- The `ShiftT0`, `EuMultiplier`, and `EuOffset` properties are of type `double`, but no constraints (e.g., non-negative, finite) are specified in metadata or code.
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- The `Filter` property’s valid values are *intended* to be constrained by `CFCFilterItemSource`, but the class does not enforce this at runtime.
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---
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### **Dependencies**
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**External Dependencies (via imports):**
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- `System.ComponentModel` – Used for `CategoryAttribute`, `DisplayNameAttribute`, and `DescriptionAttribute`.
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- `Xceed.Wpf.Toolkit.PropertyGrid.Attributes` – Provides `ItemsSourceAttribute`, used on the `Filter` property.
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**Type References (not defined here):**
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- `CFCFilterItemSource` – Referenced as a type argument for `ItemsSourceAttribute` on `Filter`. Its definition is not included in the provided source; likely a custom `IItemSource` implementation for the PropertyGrid.
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**Depended Upon By:**
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- Inferred to be used by UI components (e.g., PropertyGrid instances) in WPF applications, likely within the `DTS` system (e.g., for configuring graph elements in a test or visualization tool).
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- No other code in this file references it, so dependencies must be inferred from usage elsewhere in the codebase.
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---
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### **Gotchas**
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- **Missing `CFCFilterItemSource` definition**: The `ItemsSource` attribute on `Filter` references `CFCFilterItemSource`, but this type is not declared or imported in the provided source. Its behavior (e.g., item format, filtering logic) is unknown without additional context.
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- **No validation on numeric properties**: `ShiftT0`, `EuMultiplier`, and `EuOffset` accept any `double` value (including `NaN`, `Infinity`, or negative values), which may lead to runtime errors if consumed by downstream logic expecting valid EU conversion parameters.
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- **No inheritance or interface implementation**: The class is a plain POCO. If intended for data binding or serialization, consumers must ensure compatibility (e.g., via `INotifyPropertyChanged`, though none is implemented here).
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- **Hard-coded categories**: Categories ("Action", "Information") are fixed; renaming or reorganizing them requires code changes.
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- **No documentation on EU conversion formula**: While `EuMultiplier` and `EuOffset` suggest linear conversion (`EU = raw * EuMultiplier + EuOffset`), this is not stated explicitly in the source.
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