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tutorial:mixin_examples

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tutorial:mixin_examples [2024/01/13 15:02] – arkosammy12tutorial:mixin_examples [2026/05/16 08:25] (current) – Clarify that using shift by is discouraged. earthcomputer
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 +FIXME //The Fabric Wiki's Mixin segments is under heavy reviews, pages on the topic are subject to major edits or rewrites. This page in particular is noted as being unreliable to learn Mixin as a tool from. Learning by example should be used sparingly, as it may lead to a lack of understanding. Prioritize, if you are unable to learn through documentation, presenting your intention in detail in a Mixin support channel on the Fabric or SpongePowered Discord servers and discussing with experienced devs there.//
 +
 +
 +:!: //A rewrite of this page is planned and will be drafted in the foreseeable future, whilst some quicker changes and improvements may be applied to this page in the process, more fundamental structural changes will happen as part of a broader rewrite and replacement by a new version of the page//
 +
 ====== Mixin Examples ====== ====== Mixin Examples ======
 This is a collection of frequently used mixins. This is a collection of frequently used mixins.
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 ===== Injecting into the point with shift amount ===== ===== Injecting into the point with shift amount =====
 +:!: Using a shift amount is heavily discouraged, instead you should find a more descriptive/precise injection point.
 +
 Mixin: Mixin:
 <code java> <code java>
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 :!: If there are multiple locals with that type, you have to specify ''ordinal'' or it will throw an error. :!: If there are multiple locals with that type, you have to specify ''ordinal'' or it will throw an error.
 +
 +:!: the use of ''@Local'' is recommended over ''LocalCapture''
  
 Mixin: Mixin:
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 @Inject(method = "foo()V", at = @At(value = "TAIL")) @Inject(method = "foo()V", at = @At(value = "TAIL"))
 private void injected(CallbackInfo ci, @Local TypeArg2 arg2) { private void injected(CallbackInfo ci, @Local TypeArg2 arg2) {
-  arg1.doSomething4();+  arg2.doSomething4();
 } }
 </code> </code>
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 @Inject(method = "foo()V", at = @At(value = "TAIL")) @Inject(method = "foo()V", at = @At(value = "TAIL"))
 private void injected(CallbackInfo ci, @Local(ordinal = 2) TypeArg arg) { private void injected(CallbackInfo ci, @Local(ordinal = 2) TypeArg arg) {
-  arg1.doSomething4();+  arg.doSomething4();
 } }
 </code> </code>
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 Mixin: Mixin:
 <code java> <code java>
-@Inject(method = "foo()I;", at = @At("RETURN"), cancellable = true) +@ModifyReturnValue(method = "foo", at = @At("RETURN")) 
-private void injected(CallbackInfoReturnable<Integer> cir) { +private int exampleModifyReturnValue(int original) { 
-  cir.setReturnValue(cir.getReturnValue() * 3);+    return original * 3;
 } }
 </code> </code>
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 Result: Result:
 <code diff> <code diff>
-  public int foo() {+public int foo() {
     doSomething1();     doSomething1();
     doSomething2();     doSomething2();
 -   return doSomething3() + 7; -   return doSomething3() + 7;
-+   int i = doSomething3() + 7; ++   return this.exampleModifyReturnValue(doSomething3() + 7); 
-+   CallbackInfoReturnable<Integer> cir = new CallbackInfoReturnable<Integer>("foo", true, i); +}
-+   injected(cir); +
-+   if (cir.isCancelled()) return cir.getReturnValue(); +
-+   return i; +
-  }+
 </code> </code>
  
tutorial/mixin_examples.1705158166.txt.gz · Last modified: 2024/01/13 15:02 by arkosammy12