establish minimal but sufficient signaling for sample model

GUI/View/SampleDesigner/LayerOrientedSampleEditor.cpp

@@ -115,6 +115,9 @@ void LayerOrientedSampleEditor::setCurrentSample(MultiLayerItem* multiLayerItem)
     auto* ec = m_editControllers[m_currentMultiLayerItem];
     connect(ec, &SampleEditorController::requestViewInRealSpace, this,
             &LayerOrientedSampleEditor::requestViewInRealSpace);
+    connect(ec, &SampleEditorController::aboutToRemoveItem, this,
+            &LayerOrientedSampleEditor::aboutToRemoveItem);
+    connect(ec, &SampleEditorController::modified, this, &LayerOrientedSampleEditor::modified);
 
     m_undoAction = ec->undoStack()->createUndoAction(this);
     m_redoAction = ec->undoStack()->createRedoAction(this);

GUI/View/SampleDesigner/LayerOrientedSampleEditor.h

@@ -15,6 +15,7 @@
 #ifndef BORNAGAIN_GUI_VIEW_SAMPLEDESIGNER_LAYERORIENTEDSAMPLEEDITOR_H
 #define BORNAGAIN_GUI_VIEW_SAMPLEDESIGNER_LAYERORIENTEDSAMPLEEDITOR_H
 
+#include "GUI/Model/Sample/SampleItem.h"
 #include <QMap>
 #include <QWidget>
 
@@ -38,6 +39,8 @@ public:
 signals:
     void requestViewInRealSpace(SessionItem* itemToShow);
     void requestCreateNewSample();
+    void aboutToRemoveItem(SampleItem item);
+    void modified();
 
 private:
     void updateActionEnabling();

GUI/View/SampleDesigner/SampleView.cpp

@@ -81,12 +81,24 @@ SampleView::SampleView(QWidget* parent, ProjectDocument* document)
     connect(sampleSelectionView, &SampleListView::currentSampleChanged, scriptPanel,
             &ScriptPanel::setCurrentSample);
 
+    connect(editor, &LayerOrientedSampleEditor::modified, scriptPanel,
+            &ScriptPanel::onSampleModified);
+
     connect(editor, &LayerOrientedSampleEditor::requestViewInRealSpace, this,
             &SampleView::onRequestViewInRealSpace);
 
+    connect(editor, &LayerOrientedSampleEditor::aboutToRemoveItem, this,
+            &SampleView::onAboutToRemoveItem);
+
     connect(editor, &LayerOrientedSampleEditor::requestCreateNewSample,
             sampleSelectionView->newSampleAction(), &QAction::trigger, Qt::QueuedConnection);
 
+    connect(editor, &LayerOrientedSampleEditor::modified, m_realSpacePanel->canvas(),
+            &RealSpaceCanvas::updateScene);
+
+    connect(editor, &LayerOrientedSampleEditor::modified, m_document, &ProjectDocument::setModified,
+            Qt::UniqueConnection);
+
     setCentralWidget(editor);
     resetLayout();
 }
@@ -105,6 +117,14 @@ void SampleView::onRequestViewInRealSpace(SessionItem* itemToView)
     m_realSpacePanel->canvas()->setCurrentItem(itemToView);
 }
 
+void SampleView::onAboutToRemoveItem(SampleItem item)
+{
+    if (m_realSpacePanel->canvas()->currentItem() == item)
+        m_realSpacePanel->canvas()->resetScene();
+
+    // #baMigration ++ check whether canvas shows child of removed item
+}
+
 void SampleView::toggleRealSpaceView()
 {
     m_docks->toggleDock(REALSPACEPANEL);

GUI/View/SampleDesigner/SampleView.h

@@ -15,6 +15,7 @@
 #ifndef BORNAGAIN_GUI_VIEW_SAMPLEDESIGNER_SAMPLEVIEW_H
 #define BORNAGAIN_GUI_VIEW_SAMPLEDESIGNER_SAMPLEVIEW_H
 
+#include "GUI/Model/Sample/SampleItem.h"
 #include <QMainWindow>
 
 class DocksController;
@@ -42,6 +43,8 @@ private:
     //! If the real space view is not visible at the moment, it will be shown.
     void onRequestViewInRealSpace(SessionItem* itemToView);
 
+    void onAboutToRemoveItem(SampleItem item);
+
     DocksController* m_docks = nullptr;
     ProjectDocument* m_document = nullptr;
     RealSpacePanel* m_realSpacePanel = nullptr;