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Slightly cleanup DEVELOPER_API.md

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# Developer API # Developer API
ViaFabricPlus provides various events and APIs for developers to use. This page explains how to use them. ViaFabricPlus provides events and various utility functions for other mods to interface with it. Note that including
ViaFabricPlus in your project comes with some requirements:
- The target version is Java 17
- Fabric loom setup (As ViaFabricPlus is a Minecraft mod and has no API-only dependency like other projects)
## Include via Gradle/Maven Since the API is not exposed as standalone submodule (yet), functions that shouldn't be used are marked with
`ApiStatus.Internal`. Further information about certain functions can be found in the Javadoc in the corresponding file.
## How to include the mod as dependency
### Gradle
```groovy ```groovy
repositories { repositories {
mavenCentral() mavenCentral()
@ -14,8 +21,12 @@ repositories {
url = "https://maven.lenni0451.net/everything" url = "https://maven.lenni0451.net/everything"
} }
maven { maven {
name = "OpenCollab Snapshots" name = "Jitpack"
url = "https://repo.opencollab.dev/maven-snapshots/" url = "https://jitpack.io"
content {
includeGroup "com.github.Oryxel"
}
} }
} }
@ -24,6 +35,7 @@ dependencies {
} }
``` ```
### Maven
```xml ```xml
<repositories> <repositories>
<repository> <repository>
@ -35,8 +47,8 @@ dependencies {
<url>https://maven.lenni0451.net/everything</url> <url>https://maven.lenni0451.net/everything</url>
</repository> </repository>
<repository> <repository>
<id>opencollab-snapshots</id> <id>jitpack</id>
<url>https://repo.opencollab.dev/maven-snapshots/</url> <url>https://jitpack.io</url>
</repository> </repository>
</repositories> </repositories>
@ -49,14 +61,17 @@ dependencies {
</dependencies> </dependencies>
``` ```
## Events ## Interacting with Events
ViaFabricPlus events are using the [Fabric Event API](https://fabricmc.net/wiki/tutorial:events). You can register to them like this: ViaFabricPlus events are the intended way of interacting with the mod.
Events are fired in various situations and are using the [Fabric Event API](https://fabricmc.net/wiki/tutorial:events).
#### Example
```java ```java
ChangeProtocolVersionCallback.EVENT.register((oldVersion, newVersion) -> { ChangeProtocolVersionCallback.EVENT.register((oldVersion, newVersion) -> {
System.out.println("Version changed to " + newVersion.getName()); System.out.println("Version changed to " + newVersion.getName());
}); });
``` ```
### ViaFabricPlus has 8 events at the moment ### List of events/callbacks
| Callback class name | Description | | Callback class name | Description |
|--------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| |--------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ChangeProtocolVersionCallback | Called when the user changes the target version in the screen, or if you connect to a server for which a specific version has been selected, you disconnect, the event for the actual version is also called. | | ChangeProtocolVersionCallback | Called when the user changes the target version in the screen, or if you connect to a server for which a specific version has been selected, you disconnect, the event for the actual version is also called. |
@ -68,43 +83,21 @@ ChangeProtocolVersionCallback.EVENT.register((oldVersion, newVersion) -> {
| RegisterSettingsCallback | Called after the default setting groups are loaded and before the setting config is loaded | | RegisterSettingsCallback | Called after the default setting groups are loaded and before the setting config is loaded |
| LoadSaveFilesCallback | Called before and after the save files are loaded | | LoadSaveFilesCallback | Called before and after the save files are loaded |
## Get and set the current protocol version ### Other API calls
ViaFabricPlus uses [ViaVersion](https://github.com/ViaVersion/ViaVersion) for protocol translation, so the ViaVersion API can be used.
The general API endpoint for ViaFabricPlus specifics is `ProtocolTranslator`
```java ```java
// Get and change the current selected version
final ProtocolVersion version = ProtocolTranslator.getTargetVersion(); final ProtocolVersion version = ProtocolTranslator.getTargetVersion();
if (version == ProtocolVersion.v1_8) { if (version == ProtocolVersion.v1_8) {
ProtocolTranslator.setTargetVersion(ProtocolVersion.v1_9); ProtocolTranslator.setTargetVersion(ProtocolVersion.v1_9);
} }
```
## Get a Minecraft ClientConnection by channel // Gets the ViaVersion user connection object for raw packet sending using ViaVersion API
```java final UserConnection user = ProtocolTranslator.getPlayNetworkUserConnection();
final ClientConnection connection = channel.attr(ProtocolTranslator.CLIENT_CONNECTION_ATTRIBUTE_KEY).get(); if (user == null) {
``` // Mod not active
## Interact with UserConnection objects
```java
// If ViaVersion is translating, this field will return the user connection of the client
final UserConnection userConnection = ProtocolTranslator.getPlayNetworkUserConnection();
// If you need a dummy user connection for testing, you can use this method
final UserConnection cursedDummy = ProtocolTranslator.createDummyUserConnection(ProtocolTranslator.NATIVE_VERSION, ProtocolVersion.v1_18_2);
// The cursedDummy field now contains all protocols from the native version to 1.18.2
```
## ViaVersion internals
### Add CustomPayload channels for versions below 1.13
In order to receive custom payloads with custom channels in versions below 1.13, you need to register them, that's what you do:
```java
Protocol1_13To1_12_2.MAPPINGS.getChannelMappings().put("FML|HS", "fml:hs");
```
### Check if an item exists in a specific version
```java
final VersionRange range = ItemRegistryDiff.ITEM_DIFF.get(Items.WRITABLE_BOOK); // If an item does not appear in the item map, it has always existed
// The Range class then contains all versions in which the item occurs.
// https://github.com/ViaVersion/ViaLoader
if (ItemRegistryDiff.contains(Items.STONE, VersionRange.andOlder(ProtocolVersion.v1_8))) {
// Do something
} }
``` ```