qgsmodelviewrubberband.h

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/***************************************************************************
                             qgsmodelviewrubberband.h
                             -------------------------
    Date                 : March 2020
    Copyright            : (C) 2020 Nyall Dawson
    Email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program 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.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSMODELVIEWRUBBERBAND_H
#define QGSMODELVIEWRUBBERBAND_H
 
#include "qgis_gui.h"
#include "qgis_sip.h"
 
#include <QBrush>
#include <QObject>
#include <QPen>
 
#define SIP_NO_FILE
 
class QgsModelGraphicsView;
class QGraphicsRectItem;
class QGraphicsEllipseItem;
class QGraphicsPathItem;
class QGraphicsPolygonItem;

class GUI_EXPORT QgsModelViewRubberBand : public QObject
{
    Q_OBJECT
 
  public:
    QgsModelViewRubberBand( QgsModelGraphicsView *view = nullptr );
 
    ~QgsModelViewRubberBand() override = default;

    virtual QgsModelViewRubberBand *create( QgsModelGraphicsView *view ) const = 0 SIP_FACTORY;

    virtual void start( QPointF position, Qt::KeyboardModifiers modifiers ) = 0;

    virtual void update( QPointF position, Qt::KeyboardModifiers modifiers ) = 0;

    virtual QRectF finish( QPointF position = QPointF(), Qt::KeyboardModifiers modifiers = Qt::KeyboardModifiers() ) = 0;

    QgsModelGraphicsView *view() const;

    QBrush brush() const;

    void setBrush( const QBrush &brush );

    QPen pen() const;

    void setPen( const QPen &pen );
 
  signals:

    void sizeChanged( const QString &size );
 
  protected:
    QRectF updateRect( QPointF start, QPointF position, bool constrainSquare, bool fromCenter );
 
  private:
    QgsModelGraphicsView *mView = nullptr;
 
    QBrush mBrush = Qt::NoBrush;
    QPen mPen = QPen( QBrush( QColor( 227, 22, 22, 200 ) ), 0 );
};
 

class GUI_EXPORT QgsModelViewRectangularRubberBand : public QgsModelViewRubberBand
{
    Q_OBJECT
 
  public:
    QgsModelViewRectangularRubberBand( QgsModelGraphicsView *view = nullptr );
    QgsModelViewRectangularRubberBand *create( QgsModelGraphicsView *view ) const override SIP_FACTORY;
 
    ~QgsModelViewRectangularRubberBand() override;
 
    void start( QPointF position, Qt::KeyboardModifiers modifiers ) override;
    void update( QPointF position, Qt::KeyboardModifiers modifiers ) override;
    QRectF finish( QPointF position = QPointF(), Qt::KeyboardModifiers modifiers = Qt::KeyboardModifiers() ) override;
 
  private:
    QGraphicsRectItem *mRubberBandItem = nullptr;

    QPointF mRubberBandStartPos;
};

class GUI_EXPORT QgsModelViewBezierRubberBand : public QgsModelViewRubberBand
{
    Q_OBJECT
 
  public:
    QgsModelViewBezierRubberBand( QgsModelGraphicsView *view = nullptr );
    QgsModelViewBezierRubberBand *create( QgsModelGraphicsView *view ) const override SIP_FACTORY;
 
    ~QgsModelViewBezierRubberBand() override;
 
    void start( QPointF position, Qt::KeyboardModifiers modifiers ) override;
    void update( QPointF position, Qt::KeyboardModifiers modifiers ) override;
    QRectF finish( QPointF position = QPointF(), Qt::KeyboardModifiers modifiers = Qt::KeyboardModifiers() ) override;
 
  private:
    QGraphicsPathItem *mRubberBandItem = nullptr;

    QPointF mRubberBandStartPos;
};
 
 
#endif // QGSMODELVIEWRUBBERBAND_H