62 lines
3.7 KiB
Markdown
62 lines
3.7 KiB
Markdown
---
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source_files:
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- DataPRO/Modules/Menu/HamburgerMenu/Model/MenuCommand.cs
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generated_at: "2026-04-16T04:48:40.108913+00:00"
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model: "Qwen/Qwen3-Coder-Next-FP8"
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schema_version: 1
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sha256: "d733624401ce5030"
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---
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# Model
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### 1. **Purpose**
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`MenuCommand` is a concrete implementation of `ICommand` used to wrap menu item selections in the Hamburger Menu module. It serves as a lightweight command handler that, when executed, notifies a registered callback (`MenuItemPressedDelegate`) with the menu item’s unique identifier (`Id`). Its purpose is to decouple UI menu interactions from business logic by translating WPF command execution into a domain-specific callback, enabling loose coupling between the menu UI and the rest of the system.
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---
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### 2. **Public Interface**
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- **`MenuCommand(string id, MenuItemPressedDelegate menuItemPressed)`**
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Constructor. Initializes the command with a unique `id` (string) and a delegate (`MenuItemPressedDelegate`) to invoke on execution.
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- *Parameters*:
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- `id`: A non-null string identifying the menu item.
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- `menuItemPressed`: A delegate of type `MenuItemPressedDelegate` (defined in `DTS.Common.Interface.Menu.HamburgerMenu`) to be invoked with `id` when the command executes.
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- **`bool CanExecute(object parameter)`**
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Always returns `true`. Implements `ICommand.CanExecute`. The command is always executable regardless of the `parameter` value.
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- **`void Execute(object parameter)`**
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Invokes the `MenuItemPressed` delegate with the stored `Id`. Implements `ICommand.Execute`. The `parameter` is ignored.
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- **`event EventHandler CanExecuteChanged`**
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Implements `ICommand.CanExecuteChanged`. Declared but *never raised* — consumers should not rely on this event for change notifications.
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---
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### 3. **Invariants**
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- `Id` is immutable after construction (declared `readonly`).
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- `MenuItemPressed` delegate is non-null at construction (no null-check is performed; passing `null` will cause a `NullReferenceException` on `Execute`).
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- `CanExecute` always returns `true`; no runtime conditions affect executability.
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- `CanExecuteChanged` is declared but *never raised* — no external changes to `CanExecute` status are ever signaled.
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- `Execute` ignores its `parameter` argument entirely.
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---
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### 4. **Dependencies**
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- **Imports/References**:
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- `DTS.Common.Interface.Menu.HamburgerMenu` — Provides the `MenuItemPressedDelegate` type (not defined in this file; assumed to be a delegate type in the referenced namespace).
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- `System` and `System.Windows.Input` — For `EventHandler`, `ICommand`, and WPF command infrastructure.
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- **Consumers**:
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- Presumably instantiated by UI layer code (e.g., in a view model or menu builder) that maps menu items to `MenuCommand` instances.
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- Depends on external code to supply the `MenuItemPressedDelegate` implementation (not visible in this file).
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---
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### 5. **Gotchas**
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- **`CanExecuteChanged` is never raised** — This violates typical `ICommand` conventions (e.g., WPF command bindings may not update UI state if they rely on this event). If command executability *should* change dynamically, this implementation is incomplete.
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- **No null-safety**: Passing `null` for `menuItemPressed` in the constructor will cause a `NullReferenceException` at `Execute` time.
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- **`parameter` is unused** — `Execute` ignores its argument, which may cause issues if consumers expect parameter-based logic (e.g., passing context via `parameter`).
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- **No validation of `id`** — No checks for `null` or empty `id`; while not explicitly causing failure, this may lead to ambiguous menu item identification downstream.
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- **No thread-safety guarantees** — `CanExecuteChanged` event and delegate invocation are not synchronized.
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None identified beyond the above. |