/*
        Copyright 2006-2020 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;

/**
 * @brief The QetGraphicsHeaderItem class
 * The header have a few parameters to edit her visual aspect.
 * Margins, to edit the margin between the cell and the text.
 * Text font.
 * Text alignment in the cell
 * These three parameters are not settable directly with the header but trough the model to be displayed by the header.
 * Header search these parameters only in the section 0 for cell of header.
 * By consequence, set data in other section is useless also these parameter can't be set individually for each cell.
 * The margins is stored in the model in index Qt::UserRole+1 and for value a QString. See QETUtils::marginsFromString and  QETUtils::marginsToString
 */
class QetGraphicsHeaderItem : public QGraphicsObject
{
	Q_OBJECT

    public:
        QetGraphicsHeaderItem(QGraphicsItem *parent = nullptr);

		enum { Type = UserType + 1301 };
		int type() const override { return Type; }

		void setModel(QAbstractItemModel *model = nullptr);
        QAbstractItemModel *model() const;

        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;
		QVector<int> minimumSectionWidth()  const {return m_sections_minimum_width;}
		int minimumWidth() const {return m_minimum_width;}

		QDomElement toXml (QDomDocument &document) const;
		void fromXml(const QDomElement &element);
		static QString xmlTagName() {return QString("graphics_header");}

	signals:
		void sectionResized(int logicalIndex, int size);
		void heightResized();

	private:
		void setUpMinimumSectionsSize();
		void setUpBoundingRect();
		void headerDataChanged(Qt::Orientations orientation, int first, int last);
		void adjustSize();
		void modelReseted();

    private:
        QRectF m_bounding_rect;
        QAbstractItemModel *m_model = nullptr;
		QVector<int> m_sections_minimum_width,
					 m_current_sections_width;
		int m_section_height=1,
			m_minimum_section_height=1;
		int m_minimum_width=1;
		QRect m_current_rect;
};

#endif // QETGRAPHICSHEADERITEM_H