SizeHandleElement.h

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//  ************************************************************************************************
//
//  BornAgain: simulate and fit reflection and scattering
//
//! @file      GUI/coregui/Views/MaskWidgets/SizeHandleElement.h
//! @brief     Defines SizeHandleElement class
//!
//! @homepage  http://www.bornagainproject.org
//! @license   GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors   Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
//  ************************************************************************************************
 
#ifndef BORNAGAIN_GUI_COREGUI_VIEWS_MASKWIDGETS_SIZEHANDLEELEMENT_H
#define BORNAGAIN_GUI_COREGUI_VIEWS_MASKWIDGETS_SIZEHANDLEELEMENT_H
 
#include "GUI/coregui/Views/MaskWidgets/MaskEditorHelper.h"
#include <QCursor>
#include <QGraphicsObject>
#include <QMap>
 
//! Size handle on top of RectangleView represented as small circle or small rectangle.
//! Placed either in corners on in the middle of the edge.
 
class SizeHandleElement : public QGraphicsObject {
    Q_OBJECT
 
public:
    int type() const { return MaskEditorHelper::SIZEHANDLE; }
 
    enum EHandleLocation {
        NONE,
        TOPLEFT,
        TOPMIDDLE,
        TOPRIGHT,
        MIDDLELEFT,
        MIDDLERIGHT,
        BOTTOMLEFT,
        BOTTOMMIDLE,
        BOTTOMRIGHT,
    };
 
    enum EHandleType { RESIZE, RESIZE_WIDTH, RESIZE_HEIGHT };
 
    SizeHandleElement(EHandleLocation pointType, QGraphicsObject* parent = 0);
 
    QRectF boundingRect() const;
 
    void updateHandleElementPosition(const QRectF& rect);
 
    EHandleLocation getHandleLocation() const;
    EHandleLocation getOppositeHandleLocation() const;
    EHandleType getHandleType() const;
 
public slots:
    virtual void update_view();
 
signals:
    void resize_request(bool going_to_resize);
 
protected:
    void paint(QPainter* painter, const QStyleOptionGraphicsItem*, QWidget*);
    void mousePressEvent(QGraphicsSceneMouseEvent* event);
    void mouseReleaseEvent(QGraphicsSceneMouseEvent* event);
 
private:
    EHandleLocation m_handleLocation;
    EHandleType m_handleType;
    static QMap<EHandleLocation, Qt::CursorShape> m_cursors;
    static QMap<EHandleLocation, EHandleType> m_location_to_type;
    static QMap<EHandleLocation, EHandleLocation> m_opposite_handle_location;
};
 
#endif // BORNAGAIN_GUI_COREGUI_VIEWS_MASKWIDGETS_SIZEHANDLEELEMENT_H