Refactor composer setter

Author: pcastornii

README.md

@@ -252,10 +252,9 @@ public class FooComposer extends AbstractChildComposer<FooView> implements FooVi
     ...
 }
 ```
-3. Composer Assignment. To assign a `Composer` to the `ViewModel`, the public method
-`AbstractComponentViewModel#setComposer(...)` is used, and for the `View` — `AbstractComponentView#setComposer(...)`.
-There is also the method `AbstractComponentView#createComposer()`, which can be overridden to automate `Composer`
-creation during construction.
+3. Composer Assignment. To assign a `Composer` to the `View` and `ViewModel`, use the public method
+`AbstractComponentView#setComposer(...)`. There is also the method `AbstractComponentView#createComposer()`, which can
+be overridden to automate `Composer` creation during construction.
 
 Advantages of this approach:
 

mvvm4fx-core/src/main/java/com/techsenger/mvvm4fx/core/AbstractComponentView.java

@@ -33,11 +33,7 @@ public abstract class AbstractComponentView<T extends AbstractComponentViewModel
 
     public AbstractComponentView(T viewModel) {
         this.viewModel = viewModel;
-        var composer = createComposer();
-        this.composer = composer;
-        if (this.composer != null) {
-            viewModel.setComposer(composer.getViewModelComposer());
-        }
+        setComposer(createComposer());
     }
 
     @Override
@@ -99,8 +95,24 @@ public ComponentView.Composer getComposer() {
         return composer;
     }
 
-    public void setComposer(ComponentView.Composer composer) {
+    /**
+     * Assigns the given {@link ComponentComposer} to this view and propagates its corresponding
+     * {@link ComponentViewModel.Composer} to the view model.
+     *
+     * <p>Since {@link ComponentComposer} extends {@link ComponentView.Composer}, it contains all composition logic
+     * required by the view itself, while also providing a dedicated composer for the associated view model.
+     *
+     * <p>If {@code composer} is {@code null}, both the view and the view model are detached from any composer.
+     *
+     * @param composer the composer instance to attach to this view; may be {@code null}
+     */
+    public void setComposer(ComponentComposer<?> composer) {
         this.composer = composer;
+        if (composer == null) {
+            viewModel.setComposer(null);
+        } else {
+            viewModel.setComposer(composer.getViewModelComposer());
+        }
     }
 
     /**

mvvm4fx-core/src/main/java/com/techsenger/mvvm4fx/core/AbstractComponentViewModel.java

@@ -117,7 +117,7 @@ public Composer getComposer() {
         return composer;
     }
 
-    public void setComposer(Composer composer) {
+    protected void setComposer(Composer composer) {
         this.composer = composer;
     }