Add a combo box to change the QPicture scale of element picture

This is a test commit to see if we can fix the wrong scale of element in
some screen size.:
Add a QComboBox into the QToolBar of the diagram editor to change the
current scale factor of the element QPicture.

sources/qetdiagrameditor.cpp

@@ -738,11 +738,36 @@ void QETDiagramEditor::setUpToolBar()
 	m_depth_tool_bar->setObjectName("diagram_depth_toolbar");
 	m_depth_tool_bar->addActions(m_depth_action_group->actions());
 
+	auto element_picture_scale_tool_bar = new QToolBar(tr("Facteur d'échelle des élements"), this);
+	auto label_ = new QLabel(tr("Facteur d'échelle des élements :  "), this);
+	element_picture_scale_tool_bar->addWidget(label_);
+	m_scale_picture_cb = new QComboBox(this);
+	m_scale_picture_cb->addItem("0,25", 0.25);
+	m_scale_picture_cb->addItem("0,50", 0.5);
+	m_scale_picture_cb->addItem("0,75", 0.75);
+	m_scale_picture_cb->addItem("1", 1);
+	m_scale_picture_cb->addItem("1,25", 1.25);
+	m_scale_picture_cb->addItem("1,50", 1.5);
+	m_scale_picture_cb->addItem("1,75", 1.75);
+	m_scale_picture_cb->addItem("2", 2);
+	m_scale_picture_cb->setCurrentIndex(3);
+	element_picture_scale_tool_bar->addWidget(m_scale_picture_cb);
+	connect(m_scale_picture_cb, QOverload<int>::of(&QComboBox::currentIndexChanged), [this](int)
+	{
+		Element::setPictureScale(m_scale_picture_cb->currentData().toReal());
+		auto dv = this->currentDiagramView();
+		if (dv && dv->scene()) {
+			dv->scene()->update();
+		}
+	});
+
+
 	addToolBar(Qt::TopToolBarArea, main_tool_bar);
 	addToolBar(Qt::TopToolBarArea, view_tool_bar);
 	addToolBar(Qt::TopToolBarArea, diagram_tool_bar);
 	addToolBar(Qt::TopToolBarArea, m_add_item_tool_bar);
 	addToolBar(Qt::TopToolBarArea, m_depth_tool_bar);
+	addToolBar(Qt::TopToolBarArea, element_picture_scale_tool_bar);
 }
 
 /**

sources/qetdiagrameditor.h

@@ -42,6 +42,7 @@ class RecentFiles;
 class DiagramPropertiesEditorDockWidget;
 class ElementsCollectionWidget;
 class AutoNumberingDockWidget;
+class QComboBox;
 
 #ifdef BUILD_WITHOUT_KF5
 #else
@@ -240,5 +241,6 @@ class QETDiagramEditor : public QETMainWindow
 		int activeSubWindowIndex;
 		bool m_first_show = true;
 		SearchAndReplaceWidget m_search_and_replace_widget;
+		QComboBox *m_scale_picture_cb = nullptr;
 };
 #endif

sources/qetgraphicsitem/element.cpp

@@ -37,6 +37,8 @@
 #include <QDomElement>
 #include <utility>
 
+qreal PICTURE_SCALE = 1;
+
 class ElementXmlRetroCompatibility
 {
 	friend class Element;
@@ -126,6 +128,11 @@ Element::Element(
 	});
 }
 
+void Element::setPictureScale(qreal scale)
+{
+	PICTURE_SCALE = scale;
+}
+
 /**
 	@brief Element::~Element
 */
@@ -234,7 +241,17 @@ void Element::paint(
 	{
 		painter->drawPicture(0, 0, m_low_zoom_picture);
 	} else {
+		if (Q_UNLIKELY(PICTURE_SCALE != 1.0))
+		{
+		painter->save();
+		painter->scale(PICTURE_SCALE, PICTURE_SCALE);
 		painter->drawPicture(0, 0, m_picture);
+		painter->restore();
+		}
+		else
+		{
+			painter->drawPicture(0, 0, m_picture);
+		}
 	}
 
 	painter->restore(); //Restor the QPainter after use drawPicture

sources/qetgraphicsitem/element.h

@@ -95,6 +95,7 @@ class Element : public QetGraphicsItem
 
 
 	public:
+		static void setPictureScale(qreal scale);
 		QList<Terminal *> terminals() const;
 		QList<Conductor *> conductors() const;
 		QList<QPair<Terminal *,Terminal *>> AlignedFreeTerminals() const;