68 lines
4.9 KiB
Markdown
68 lines
4.9 KiB
Markdown
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---
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source_files:
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- Common/DTS.Common/Events/ChannelCodes/ChannelCodesViewChangedEvent.cs
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- Common/DTS.Common/Events/ChannelCodes/ChannelCodeCommittedEvent.cs
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generated_at: "2026-04-16T03:25:06.865522+00:00"
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model: "Qwen/Qwen3-Coder-Next-FP8"
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schema_version: 1
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sha256: "6fb84d209aefd419"
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---
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# ChannelCodes
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## Documentation: Channel Codes Event Definitions
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### 1. Purpose
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This module defines Prism-based pub/sub events used to communicate channel code state changes across the application—specifically, when the user switches the view mode for channel codes (`ChannelCodesViewChangedEvent`) and when one or more channel codes are committed (saved) by the user (`ChannelCodeCommittedEvent`). These events decouple UI components (e.g., views, viewmodels) that trigger or react to channel code operations, enabling modular and testable interaction without tight coupling.
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---
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### 2. Public Interface
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#### `ChannelCodesViewChangedEvent`
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- **Type**: `class` (inherits `PubSubEvent<DTS.Common.Enums.IsoViewMode>`)
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- **Payload**: `DTS.Common.Enums.IsoViewMode`
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- **Behavior**: A singleton event used to notify subscribers when the active view mode for channel codes has changed. The payload indicates the new view mode (e.g., `IsoViewMode.List`, `IsoViewMode.Tree`). Subscribers should update their UI or internal state accordingly.
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#### `ChannelCodeCommittedEvent`
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- **Type**: `class` (inherits `PubSubEvent<ChannelCodeCommittedEventArgs[]>`)
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- **Payload**: `ChannelCodeCommittedEventArgs[]` (array of committed channel codes)
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- **Behavior**: A singleton event used to publish one or more channel codes that have been successfully committed (e.g., saved or persisted). Subscribers may refresh caches, update related UI, or audit the action.
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##### `ChannelCodeCommittedEventArgs`
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- **Type**: `class`
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- **Properties**:
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- `ChannelCodeType`: `ChannelEnumsAndConstants.ChannelCodeType` — the semantic type of the channel code (e.g., `ChannelCodeType.Network`, `ChannelCodeType.Service`).
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- `Code`: `string` — the canonical identifier string for the channel code (e.g., `"NBC"`).
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- `Name`: `string` — the human-readable display name (e.g., `"National Broadcasting Company"`).
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- `CanUserCommitChannelCodes`: `bool` — indicates whether the user who triggered the commit has write privileges for channel codes.
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- **Behavior**: Encapsulates metadata about a single committed channel code. Instances are created and published as part of the `ChannelCodeCommittedEvent` payload.
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---
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### 3. Invariants
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- `ChannelCodeCommittedEventArgs.Code` and `ChannelCodeCommittedEventArgs.Name` are non-null (enforced by constructor; no validation is performed in the class itself, but nulls would likely cause downstream failures).
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- `ChannelCodeCommittedEventArgs.ChannelCodeType` must be a valid member of `ChannelEnumsAndConstants.ChannelCodeType` (enforced by caller; no runtime check in the class).
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- `ChannelCodeCommittedEvent` payload is always an array (possibly empty or with one or more elements); no ordering guarantee is specified.
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- `CanUserCommitChannelCodes` reflects the *submitting user’s* privileges at the time of commit, not necessarily the current user’s privileges.
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---
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### 4. Dependencies
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- **Dependencies on other modules**:
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- `Prism.Events` (external library for event aggregation).
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- `DTS.Common.Enums` (for `IsoViewMode` used in `ChannelCodesViewChangedEvent`).
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- `DTS.Common.Enums.Channels` (for `ChannelEnumsAndConstants.ChannelCodeType` used in `ChannelCodeCommittedEventArgs`).
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- **Depended upon by**:
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- UI components (e.g., views/viewmodels handling channel code display or editing) that subscribe to these events to synchronize state.
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- Likely consumed by modules in `DTS.Common` and higher layers (e.g., `DTS.Client` or `DTS.Application`) that manage channel code workflows.
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---
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### 5. Gotchas
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- **Namespace inconsistency**: `ChannelCodesViewChangedEvent` resides in `DTS.Common.Events`, while `ChannelCodeCommittedEvent` resides in `DTS.Common.Events.ChannelCodes`. This may cause confusion when discovering or subscribing to events.
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- **No validation in `ChannelCodeCommittedEventArgs`**: The constructor accepts any `string` values for `Code`/`Name` and does not enforce non-empty or format constraints. Callers must ensure validity.
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- **Privilege flag is static at commit time**: `CanUserCommitChannelCodes` is captured at the moment of commit and does not reflect potential privilege changes afterward. Subscribers should treat it as a historical snapshot.
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- **No documentation of `IsoViewMode` values**: The meaning of each `IsoViewMode` enum member is not included here; refer to `DTS.Common.Enums.IsoViewMode` definition.
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- **Array payload may be empty**: `ChannelCodeCommittedEvent` may be published with an empty array (e.g., in batch operations where no codes were actually modified). Subscribers should handle this case.
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- **None identified from source alone** for `ChannelCodesViewChangedEvent` beyond namespace inconsistency.
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