# MgGrid — Lifecycle & CRUD

> Part of the MgGrid system. See `README.md` for overview and component hierarchy.

## Lifecycle

```
1. OnInitializedAsync()
   ├── Validate Logger, SignalRClient (throw if null)
   ├── Create SignalRCrudTags from message tag parameters
   ├── Create TSignalRDataSource via Activator.CreateInstance(SignalRClient, crudTags, ContextIds)
   ├── Set DataSource.FilterText
   ├── Bind grid Data to data source inner list
   └── Subscribe to: OnDataSourceLoaded, OnDataSourceItemChanged, OnSyncingStateChanged

2. SetParametersAsyncCore() [first time]
   ├── Set KeyFieldName = "Id"
   ├── Wire 6 DxGrid events → internal handlers (see MGGRID_PARAMETERS.md)
   ├── Add OnCustomizeElement handler (edit row highlighting, detail cell styling)
   └── Set defaults: TextWrapEnabled=false, AllowSelectRowByClick=true, etc.

3. OnParametersSet() [first time]
   ├── Set GridName default: "{TDataItem.Name}Grid"
   ├── Set AutoSaveLayoutName default: "Grid{TDataItem.Name}"
   ├── Wire layout auto-loading/saving handlers
   └── Register with GridWrapper via GridWrapper.RegisterGrid(this)

4. OnAfterRenderAsync(firstRender: true)
   ├── If DataSource parameter was provided: LoadDataSource(dataSourceParam, sync, notify)
   └── Else: LoadDataSourceAsync(notify) — fires SignalR GetAll request
```

## CRUD Operations

### Adding Items

```csharp
await grid.AddDataItem(item);       // local add, sync later
await grid.AddDataItemAsync(item);  // immediate server sync

await grid.InsertDataItem(0, item);      // insert at index, sync later
await grid.InsertDataItemAsync(0, item); // insert at index, immediate sync
```

### Other CRUD Methods

| Method | Description |
|---|---|
| `UpdateDataItem(item)` | Local update, sync later |
| `UpdateDataItemAsync(item)` | Immediate server sync |
| `AddOrUpdateDataItem(item)` | Add if new, update if existing |
| `RemoveDataItem(item)` | Remove by entity reference |
| `RemoveDataItem(id)` | Remove by ID |
| `ReloadDataSourceAsync()` | Re-fetch all data from server |
| `ForceRenderAsync()` | Force grid re-initialization via new render key |

### ID Generation for New Items

New items get **temporary client-side IDs** until the server assigns real ones:

| TId Type | Strategy | Example |
|---|---|---|
| `Guid` | `Guid.NewGuid()` | `a1b2c3d4-...` |
| `int` | `-1 * AcDomain.NextUniqueInt32` | `-1`, `-2`, `-3`, ... |

**Convention:** Negative integer IDs indicate unsaved items. The server replaces them with real auto-increment IDs.

### Edit Flow (Inline)

```
User clicks Edit → OnEditStart → OnCustomizeEditModel
  ├── For new items: assign temp ID, set parent FK if detail grid
  ├── Set GridEditState = New/Edit
  ├── Fire OnGridCustomizeEditModel callback
  ├── Re-read the edit model after the callback — the consumer may have created/replaced it
  │     (official DevExpress pattern for types without a parameterless ctor); any instance the
  │     pre-callback block has not seen gets the same temp-ID/parent-FK initialization
  └── Notify InfoPanel: SetEditMode() — skipped with a Logger.Warning when no edit model exists
        (e.g. stale focused row after a datasource reload; see MGGRID_ISSUES.md#acblazor-grid-i-n7k2)

User clicks Save → OnItemSaving
  ├── Fire OnGridEditModelSaving callback (can cancel)
  ├── If new: AddDataItemAsync / InsertDataItemAsync — the local add is immediate; the row appears
  │     at the sort position of its temp ID until the server confirms
  ├── If existing: UpdateDataItemAsync
  ├── Reset GridEditState = None
  └── Clear InfoPanel edit mode

Server confirm (async, per item) → OnDataSourceItemChanged
  ├── The response is applied to the SAME instance in place (CopyTo — external references stay
  │     valid; no collection notification fires)
  └── Grid.Reload() re-processes the local view (sort/filter/page) — a new row jumps to its final
        sorted position (real ID) without a data re-query

User clicks Cancel → OnEditCanceling
  ├── Reset GridEditState = None
  └── Clear InfoPanel edit mode
```

### Edit Row Highlighting

When `GridEditState != None`, the focused row and its cells get `background-color: #fffbeb` (warm yellow) via `OnCustomizeElement`.

## Disposal

`DisposeAsync()`: sets `_isDisposed = true` (every async callback checks it and bails), unsubscribes the
three datasource events (`OnDataSourceLoaded`, `OnDataSourceItemChanged`, `OnSyncingStateChanged`) and
`OnCustomizeElement`, then `GC.SuppressFinalize(this)`.