Add QetGraphicsHeaderItem

sources/qetgraphicsitem/ViewItem/qetgraphicsheaderitem.h

@@ -0,0 +1,60 @@
+/*
+        Copyright 2006-2019 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/>.
+*/
+#ifndef QETGRAPHICSHEADERITEM_H
+#define QETGRAPHICSHEADERITEM_H
+
+#include "qetapp.h"
+
+#include <QGraphicsObject>
+#include <QFont>
+#include <QMargins>
+
+class QAbstractItemModel;
+
+class QetGraphicsHeaderItem : public QGraphicsObject
+{
+    public:
+        QetGraphicsHeaderItem(QGraphicsItem *parent = nullptr);
+
+        void setModel(QAbstractItemModel *model);
+        QAbstractItemModel *model() const;
+        void reset();
+
+        virtual QRectF boundingRect() const override;
+        virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
+		QRect rect() const;
+		void resizeSection(int logicalIndex, int size);
+		int sectionSize(int logical_index) const;
+
+	private:
+		void setUpMinimumSectionsSize();
+		void setUpBoundingRect();
+
+    private:
+        QRectF m_bounding_rect;
+        QAbstractItemModel *m_model = nullptr;
+        QFont m_font = QETApp::diagramTextsFont();
+		QMargins m_margin;
+		QVector<int> m_sections_minimum_width,
+					 m_current_sections_width;
+		int m_section_height=1;
+		QRect m_minimum_rect,
+			  m_current_rect;
+};
+
+#endif // QETGRAPHICSHEADERITEM_H