[enh] Harmonize SysML icons and action diagram node palette

CHANGELOG.adoc

@@ -48,6 +48,7 @@ The parsed elements are still imported, and the loading report includes the pars
 - [cleanup] Use `SemanticRunnableFactory` more widely in integration tests, replacing the `IExecuteEditingContextFunctionRunner` by the `SemanticRunnableFactory`.
 - [releng] Remove redundant inherited Maven `groupId` and `version` declarations from backend modules.
 - [frontend] Export six components and eight hooks from `@eclipse-syson/syson-components` for expression tools and properties, the new-object report, diagram visibility, and node rotation.
+- [core] Harmonize SysML icons
 
 === New features
 

backend/metamodel/syson-sysml-metamodel-edit/src/main/java/org/eclipse/syson/sysml/provider/ItemUsageItemProvider.java

@@ -1,5 +1,5 @@
-/**
- * Copyright (c) 2023, 2024 Obeo.
+/*******************************************************************************
+ * Copyright (c) 2023, 2026 Obeo.
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
  * which accompanies this distribution, and is available at
@@ -9,7 +9,7 @@
  *
  * Contributors:
  *     Obeo - initial API and implementation
- */
+ *******************************************************************************/
 package org.eclipse.syson.sysml.provider;
 
 import java.util.Collection;
@@ -20,8 +20,10 @@
 import org.eclipse.emf.common.notify.Notification;
 import org.eclipse.emf.edit.provider.ComposeableAdapterFactory;
 import org.eclipse.emf.edit.provider.IItemPropertyDescriptor;
+import org.eclipse.syson.sysml.Behavior;
 import org.eclipse.syson.sysml.FeatureDirectionKind;
 import org.eclipse.syson.sysml.ItemUsage;
+import org.eclipse.syson.sysml.Step;
 import org.eclipse.syson.sysml.SysmlPackage;
 
 /**
@@ -82,7 +84,12 @@ protected void addItemDefinitionPropertyDescriptor(Object object) {
     @Override
     public Object getImage(Object object) {
         StringBuilder iconPath = new StringBuilder();
-        iconPath.append("full/obj16/ItemUsage");
+        boolean isParameter = this.isParameter(object);
+        if (isParameter) {
+            iconPath.append("full/obj16/parameter");
+        } else {
+            iconPath.append("full/obj16/ItemUsage");
+        }
         if (object instanceof ItemUsage item) {
             FeatureDirectionKind direction = item.getDirection();
             if (direction != null) {
@@ -93,6 +100,14 @@ public Object getImage(Object object) {
         return this.overlayImage(object, this.getResourceLocator().getImage(iconPath.toString()));
     }
 
+    /**
+     * @generated NOT
+     */
+    private boolean isParameter(Object object) {
+        return object instanceof ItemUsage itemUsage && (itemUsage.getOwningType() instanceof Step || itemUsage.getOwningType() instanceof Behavior)
+                && itemUsage.getDirection() != null;
+    }
+
     /**
      * This returns the label text for the adapted class. <!-- begin-user-doc --> <!-- end-user-doc -->
      *

backend/metamodel/syson-sysml-metamodel-edit/src/main/java/org/eclipse/syson/sysml/provider/ReferenceUsageItemProvider.java

@@ -1,5 +1,5 @@
-/**
- * Copyright (c) 2023, 2024 Obeo.
+/*******************************************************************************
+ * Copyright (c) 2023, 2026 Obeo.
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
  * which accompanies this distribution, and is available at
@@ -9,16 +9,20 @@
  *
  * Contributors:
  *     Obeo - initial API and implementation
- */
+ *******************************************************************************/
 package org.eclipse.syson.sysml.provider;
 
 import java.util.Collection;
 import java.util.List;
 
+import org.apache.commons.lang3.StringUtils;
 import org.eclipse.emf.common.notify.AdapterFactory;
 import org.eclipse.emf.common.notify.Notification;
 import org.eclipse.emf.edit.provider.IItemPropertyDescriptor;
+import org.eclipse.syson.sysml.Behavior;
+import org.eclipse.syson.sysml.FeatureDirectionKind;
 import org.eclipse.syson.sysml.ReferenceUsage;
+import org.eclipse.syson.sysml.Step;
 
 /**
  * This is the item provider adapter for a {@link org.eclipse.syson.sysml.ReferenceUsage} object. <!-- begin-user-doc
@@ -57,7 +61,29 @@ public List<IItemPropertyDescriptor> getPropertyDescriptors(Object object) {
      */
     @Override
     public Object getImage(Object object) {
-        return this.overlayImage(object, this.getResourceLocator().getImage("full/obj16/ReferenceUsage.svg"));
+        StringBuilder iconPath = new StringBuilder();
+        boolean isParameter = this.isParameter(object);
+        if (isParameter) {
+            iconPath.append("full/obj16/parameter");
+        } else {
+            iconPath.append("full/obj16/ReferenceUsage");
+        }
+        if (object instanceof ReferenceUsage referenceUsage) {
+            FeatureDirectionKind direction = referenceUsage.getDirection();
+            if (direction != null) {
+                iconPath.append(StringUtils.capitalize(direction.getLiteral()));
+            }
+        }
+        iconPath.append(".svg");
+        return this.overlayImage(object, this.getResourceLocator().getImage(iconPath.toString()));
+    }
+
+    /**
+     * @generated NOT
+     */
+    private boolean isParameter(Object object) {
+        return object instanceof ReferenceUsage referenceUsage && (referenceUsage.getOwningType() instanceof Step || referenceUsage.getOwningType() instanceof Behavior)
+                && referenceUsage.getDirection() != null;
     }
 
     /**