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Revised multiple documentation files to replace instances of "FrikaMF" with "gregCore," reflecting the updated naming conventions and project structure. This change enhances consistency and clarity across the documentation, ensuring that users and contributors have accurate information regarding the framework and its components.
78 lines
3.3 KiB
Markdown
78 lines
3.3 KiB
Markdown
---
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title: Greg hooks showcase (sample mod)
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sidebar_label: Greg hooks showcase
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description: Subscribe to greg.* hooks via GregShowcaseMod, GregEventDispatcher, GregPayload, and optional OnCancelable veto.
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---
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# Greg hooks showcase
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The **gregFramework** repo ships **GregShowcaseMod** at `mods/GregShowcaseMod/`. It demonstrates the public API only:
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- `GregEventDispatcher.On` / `Once` / `OnCancelable` / `UnregisterAll`
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- `GregHookName.Create(GregDomain.*, "Action")`
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- `GregPayload.Get<T>` / `GregPayload.Dump` for anonymous payloads
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## Canonical hook strings
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Runtime names look like `greg.<DOMAIN>.<Action>`. Always build them with `GregHookName.Create` — do not concatenate raw strings in mods.
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## Registry
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**`greg_hooks.json`** at the **gregFramework** repository root is the canonical catalog (`description`, `payloadSchema`, `strategy`, optional `legacy`). A copy is emitted next to **`gregCore.dll`** for `GregCompatBridge` legacy resolution.
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Authoritative documentation: [greg hooks registry (IL2CPP)](/wiki/reference/greg-hooks-registry) — regeneration script, whitelist, and Harmony deduplication rules.
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## FFI bridge and greg.* emission
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`DataCenterModLoader.EventDispatcher` emits **`greg.*`** events through **`GregHookIntegration`** for the same gameplay moments as the Rust FFI event ids (money, cables, customers, save/load, etc.), even when the FFI bridge is not connected.
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## Payload access patterns
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**Pattern A — dynamic (anonymous types from compiler):**
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```csharp
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private static void OnCoinChanged(object payload)
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{
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dynamic p = payload;
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float delta = (float)p.coinChangeAmount;
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float balance = (float)p.newBalance;
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MelonLogger.Msg($"Δ={delta} → {balance}");
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}
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```
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**Pattern B — `GregPayload` (reflection, case-insensitive property names):**
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```csharp
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private static void OnReputationChanged(object payload)
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{
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var amount = GregPayload.Get<float>(payload, "amount");
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var rep = GregPayload.Get<float>(payload, "reputation");
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MelonLogger.Msg($"Reputation: {amount} → {rep}");
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}
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```
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**Pattern C — typed record (when you define a shared contract in your mod or core):**
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```csharp
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// public record PlayerMoneyPayload(float CoinChangeAmount, float NewBalance, bool WithoutSound, bool Accepted);
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// if (payload is PlayerMoneyPayload p) { ... }
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```
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Use **`GregPayload.Dump(payload)`** for one-line debug strings.
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## Prefix hooks and cancellation
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Hooks that run **before** the original method (Harmony Prefix) can call **`GregEventDispatcher.InvokeCancelable(hookName, payload)`**. Mods register **`GregEventDispatcher.OnCancelable(hookName, p => bool, modId)`**; if any handler returns `false`, the integration can skip the original (e.g. `Player.UpdateCoin`). Der Showcase nutzt **`GregNativeEventHooks.PlayerCoinChanged`** (`greg.PLAYER.CoinChanged`).
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Showcase: enable `blockNegativeTransactions` in `content/modconfig.json` to register a veto on large negative `coinChangeAmount` values.
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## Configuration
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Edit **`content/modconfig.json`** next to the built DLL (defaults are copied from the repo). Keys include `logPlayerEvents`, `logNetworkEvents`, `blockNegativeTransactions`, `reputationWarningThreshold`.
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## See also
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- [Mod developers (hub)](./overview)
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- [System architecture principles](/wiki/meta/system-architecture-principles)
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- [Framework](/wiki/mods/framework)
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