Disable deletion if a terminal can't be deleted.

In case of user try to delete a terminal element who is bridged
or belong to a physical terminal with more than one level, the deletion
is aborted to avoid mistake in the terminal strip parent of the terminal
element. A dialog is opened when the deletion can't be to explain to
user what to do for enable the deletion.

sources/diagramcontent.cpp

@@ -59,7 +59,15 @@ DiagramContent::DiagramContent(Diagram *diagram, bool selected) :
 	{
 		switch (item->type())
 		{
-			case Element::Type:             { m_elements    << qgraphicsitem_cast<Element *>(item);             break;}
+			case Element::Type:
+			{
+				auto element = qgraphicsitem_cast<Element *>(item);
+				m_elements << element;
+				if (element->elementData().m_type == ElementData::Terminale) {
+					m_terminal_elements << static_cast<TerminalElement*>(element);
+				}
+				break;
+			}
 			case IndependentTextItem::Type: { m_text_fields << qgraphicsitem_cast<IndependentTextItem *>(item); break;}
 			case Conductor::Type:
 			{

sources/diagramcontent.h

@@ -21,6 +21,8 @@
 #include <QSet>
 #include <QVector>
 
+#include "../qetgraphicsitem/terminalelement.h"
+
 class QGraphicsItem;
 class Conductor;
 class Element;
@@ -81,6 +83,7 @@ class DiagramContent
 		QList<QGraphicsItem *> m_selected_items;
 		QVector<QetGraphicsTableItem *> m_tables;
 		QVector<TerminalStripItem *> m_terminal_strip;
+		QVector<QPointer<TerminalElement>> m_terminal_elements;
 
 		
 		QList<DiagramTextItem *> selectedTexts() const;

sources/qetdiagrameditor.cpp

@@ -1468,12 +1468,21 @@ void QETDiagramEditor::selectionGroupTriggered(QAction *action)
 
 	if (!dv || value.isEmpty()) return;
 
-	if (value == "delete_selection")
-	{
-		diagram->clearSelection();
-		diagram->undoStack().push(new DeleteQGraphicsItemCommand(diagram, dc));
-		dv->adjustSceneRect();
-	}
+        if (value == "delete_selection")
+        {
+            if (DeleteQGraphicsItemCommand::hasNonDeletableTerminal(dc)) {
+                QET::QetMessageBox::information(this,
+                                                tr("Suppression de borne impossible"),
+                                                tr("La suppression ne peut être effectué car la selection "
+												   "possède une ou plusieurs bornes ponté et/ou appartenant à une borne à niveau multiple.\n"
+                                                   "Déponter et/ou supprimer les niveaux des bornes concerné "
+                                                   "afin de pouvoir les supprimer"));
+            } else {
+                diagram->clearSelection();
+                diagram->undoStack().push(new DeleteQGraphicsItemCommand(diagram, dc));
+                dv->adjustSceneRect();
+            }
+        }
 	else if (value == "rotate_selection")
 	{
 		RotateSelectionCommand *c = new RotateSelectionCommand(diagram);

sources/undocommand/deleteqgraphicsitemcommand.cpp

@@ -28,6 +28,8 @@
 #include "../qetgraphicsitem/elementtextitemgroup.h"
 #include "../qetgraphicsitem/terminal.h"
 #include "addelementtextcommand.h"
+#include "../TerminalStrip/realterminal.h"
+#include "../TerminalStrip/physicalterminal.h"
 
 /**
 	@brief DeleteQGraphicsItemCommand::DeleteQGraphicsItemCommand
@@ -115,6 +117,36 @@ DeleteQGraphicsItemCommand::~DeleteQGraphicsItemCommand()
 	m_diagram->qgiManager().release(m_removed_contents.items(DiagramContent::All));
 }
 
+/**
+ * @brief DeleteQGraphicsItemCommand::hasNonDeletableTerminal
+ * Return true if @content have terminal element which can't be deleted.
+ * The reason why a terminal can't be deleted is because they have bridge
+ * or belong to a physical terminal with more than one level.
+ * @param diagram
+ * @param content
+ * @param dialog
+ * @return
+ */
+bool DeleteQGraphicsItemCommand::hasNonDeletableTerminal(const DiagramContent &content)
+{
+    if (!content.m_terminal_elements.isEmpty())
+    {
+        for (const auto &terminal : content.m_terminal_elements)
+        {
+            if (!terminal.isNull())
+            {
+                if (terminal->parentTerminalStrip()
+                    && (terminal->realTerminal()->isBridged()
+                        || terminal->realTerminal()->physicalTerminal()->levelCount() != 1)) {
+                    return true;
+                }
+            }
+        }
+    }
+
+    return false;
+}
+
 /**
 	@brief DeleteQGraphicsItemCommand::setPotentialsOfRemovedElements
 	This function creates new conductors (if needed) for conserve the electrical potentials

sources/undocommand/deleteqgraphicsitemcommand.h

@@ -34,10 +34,10 @@ class DeleteQGraphicsItemCommand : public QUndoCommand
 	public:
 		DeleteQGraphicsItemCommand(Diagram *diagram, const DiagramContent &content, QUndoCommand * parent = nullptr);
 		~DeleteQGraphicsItemCommand() override;
+		static bool hasNonDeletableTerminal(const DiagramContent &content);
 
 	private:
 		DeleteQGraphicsItemCommand(const DeleteQGraphicsItemCommand &);
-
 		void setPotentialsOfRemovedElements();
 		Terminal *terminalInSamePotential(Terminal *terminal, Conductor *conductor_to_exclude);