Element editor : improve code

Better use of signal partsAdded and partsRemoved

sources/editor/UndoCommand/addpartcommand.cpp

@@ -0,0 +1,84 @@
+/*
+	Copyright 2006-2022 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "addpartcommand.h"
+#include "../elementscene.h"
+
+/**
+ * @brief AddPartCommand::AddPartCommand
+ * @param text : text of the undo command
+ * @param scene : scene where @a part must be added
+ * @param part : part to add
+ * @param parent : parent undo command
+ */
+AddPartCommand::AddPartCommand(const QString &text,
+							   QPointer<ElementScene> scene,
+							   QGraphicsItem *part,
+							   QUndoCommand *parent) :
+	QUndoCommand{parent},
+	m_scene{scene},
+	m_part{part}
+{
+	setText(text);
+	m_scene->qgiManager().manage(part);
+}
+
+/**
+ * @brief AddPartCommand::~AddPartCommand
+ */
+AddPartCommand::~AddPartCommand()
+{
+	if (m_scene) {
+		m_scene->qgiManager().release(m_part.first());
+	}
+}
+
+/**
+ * @brief AddPartCommand::undo
+ */
+void AddPartCommand::undo()
+{
+	if (m_scene) {
+		m_scene->removeItems(m_part);
+	}
+}
+
+/**
+ * @brief AddPartCommand::redo
+ */
+void AddPartCommand::redo()
+{
+	if (!m_scene) {
+		return;
+	}
+
+	if (m_first_redo)
+	{
+		auto part_{m_part.first()};
+		if (!part_->zValue())
+		{
+			// the added part has no specific zValue already defined, we put it
+			// above existing items (but still under terminals)
+			const auto existing_items = m_scene->zItems(ElementScene::SortByZValue | ElementScene::SelectedOrNot);
+			const auto z_{existing_items.count() ? existing_items.last()->zValue() + 1 : 1};
+			part_->setZValue(z_);
+		}
+		m_scene->clearSelection();
+		m_first_redo = false;
+	}
+	m_scene->addItems(m_part);
+}