free ParticleLayoutForm from SessionItem

GUI/View/SampleDesigner/ParticleLayoutForm.cpp

@@ -46,7 +46,8 @@ ParticleLayoutForm::ParticleLayoutForm(LayerForm* parent, ParticleLayoutItem* la
             LayerEditorUtils::createWidgetForItemWithParticles(this, particle, true, ec));
 
     auto* btn = LayerEditorUtils::createAddParticleButton(
-        this, [=](const QString& cls) { ec->addParticle(layoutItem, cls); });
+        this, [=](FormFactorItemCatalog::Type type) { ec->addParticle(layoutItem, type); },
+        [=](ItemWithParticlesCatalog::Type type) { ec->addParticle(layoutItem, type); });
     m_structureEditingWidgets << btn;
     layouter.addStructureEditingRow(btn);
 
@@ -77,16 +78,14 @@ ParticleLayoutItem* ParticleLayoutForm::layoutItem() const
     return m_layoutItem;
 }
 
-void ParticleLayoutForm::onParticleAdded(SessionItem* new_item)
+void ParticleLayoutForm::onParticleAdded(ItemWithParticles* p)
 {
-    if (auto* p = dynamic_cast<ItemWithParticles*>(new_item)) {
-        int index = m_layoutItem->particles().indexOf(p);
-        const int rowInLayout =
-            m_layout->rowCount() - 1 - (m_layoutItem->particles().size() - 1) + index; // -1: btn
-
-        m_layout->insertRow(
-            rowInLayout, LayerEditorUtils::createWidgetForItemWithParticles(this, p, true, m_ec));
-    }
+    int index = m_layoutItem->particles().indexOf(p);
+    const int rowInLayout =
+        m_layout->rowCount() - 1 - (m_layoutItem->particles().size() - 1) + index; // -1: btn
+
+    m_layout->insertRow(rowInLayout,
+                        LayerEditorUtils::createWidgetForItemWithParticles(this, p, true, m_ec));
 }
 
 void ParticleLayoutForm::onAboutToRemoveParticle(ItemWithParticles* item)

GUI/View/SampleDesigner/ParticleLayoutForm.h

@@ -23,7 +23,6 @@ class SampleEditorController;
 class QFormLayout;
 class ParticleLayoutItem;
 class LayerForm;
-class SessionItem;
 class ItemWithParticles;
 class DoubleSpinBox;
 class LayerItem;
@@ -38,7 +37,7 @@ public:
 
     void enableStructureEditing(bool b);
     ParticleLayoutItem* layoutItem() const;
-    void onParticleAdded(SessionItem* item);
+    void onParticleAdded(ItemWithParticles* item);
     void onAboutToRemoveParticle(ItemWithParticles* item);
 
     //! Disable/enable total density property depending on type of interference function.