[m.0] Connect only selected projections to real-time plot update (#1046) (Closes #1046)

Merging branch 'm.0'  into 'main'.

See merge request !2785

GUI/View/Overlay/LineOverlays.cpp

@@ -84,7 +84,6 @@ void HorizontalLineOverlay::onChangedY()
 {
     setBlockOnProperty(true);
     m_item->setPos(y2coo(this->y()));
-    emit m_item->maskGeometryChanged();
     setBlockOnProperty(false);
 }
 
@@ -132,7 +131,6 @@ void VerticalLineOverlay::onChangedX()
 {
     setBlockOnProperty(true);
     m_item->setPos(x2coo(this->x()));
-    emit m_item->maskGeometryChanged();
     setBlockOnProperty(false);
 }
 

GUI/View/Scene/MaskGraphicsScene.cpp

@@ -543,6 +543,7 @@ void MaskGraphicsScene::onSceneSelectionChanged()
         if (m_masks->currentItem() && m_masks->currentItem()->isVisible())
             m_masks->setCurrentIndex(-1);
         m_prjns->setCurrentIndex(-1);
+        connectSelectedLineMove(nullptr);
     } else {
         const MaskItem* selected_item = maskItemForOverlay(selectedMaskOverlay());
         ASSERT(selected_item);
@@ -551,11 +552,11 @@ void MaskGraphicsScene::onSceneSelectionChanged()
         current_set->setCurrentIndex(current_set->index_of(selected_item));
         unselectOtherModelThan(current_set);
 
-        // switch projection plot
         if (current_set == m_prjns) {
             const auto* line_item = dynamic_cast<const LineItem*>(selected_item);
             ASSERT(line_item);
-            emit lineItemMoved(line_item);
+            emit lineItemMoved(line_item);      // switch projection plot
+            connectSelectedLineMove(line_item); // activate updating projection plot while moving
         }
 
         // switch panel
@@ -597,6 +598,25 @@ void MaskGraphicsScene::selectOnlyGivenItem(QGraphicsItem* givenItem)
         emit selectionChanged();
 }
 
+void MaskGraphicsScene::connectSelectedLineMove(const LineItem* given_line)
+{
+    for (const auto& [item, overlay] : m_mask2overlay) {
+        if (item == given_line) {
+            if (dynamic_cast<const HorizontalLineItem*>(given_line))
+                connect(overlay, &QGraphicsObject::yChanged, item,
+                        &OverlayItem::maskGeometryChanged, Qt::UniqueConnection);
+            else if (dynamic_cast<const VerticalLineItem*>(given_line))
+                connect(overlay, &QGraphicsObject::xChanged, item,
+                        &OverlayItem::maskGeometryChanged, Qt::UniqueConnection);
+        } else {
+            disconnect(overlay, &QGraphicsObject::xChanged, item,
+                       &OverlayItem::maskGeometryChanged);
+            disconnect(overlay, &QGraphicsObject::yChanged, item,
+                       &OverlayItem::maskGeometryChanged);
+        }
+    }
+}
+
 //! Processes RectangleItem and EllipseItem drawing.
 //! Called upon mouse move event (with left button down).
 //! If mouse has moved sufficiently far, a new item is created.

GUI/View/Scene/MaskGraphicsScene.h

@@ -90,6 +90,8 @@ private:
     void selectOnlyItemAtMousePos(QGraphicsSceneMouseEvent* event);
     void selectOnlyGivenItem(QGraphicsItem* givenItem);
 
+    void connectSelectedLineMove(const LineItem* given_line);
+
     void processRectangleOrEllipseItem(QGraphicsSceneMouseEvent* event);
     void processPolygonItem(QGraphicsSceneMouseEvent* event);
     void processLineItem(QGraphicsSceneMouseEvent* event);