qgsgradientstopeditor.h

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/***************************************************************************
    qgsgradientstopeditor.h
    -----------------------
    begin                : April 2016
    copyright            : (C) 2016 by 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 QGSGRADIENTSTOPEDITOR_H
#define QGSGRADIENTSTOPEDITOR_H

#include "qgsvectorcolorrampv2.h"
#include <QWidget>


class GUI_EXPORT QgsGradientStopEditor : public QWidget
{
    Q_OBJECT

  public:

    QgsGradientStopEditor( QWidget* parent = nullptr, QgsVectorGradientColorRampV2* ramp = nullptr );

    void setGradientRamp( const QgsVectorGradientColorRampV2& ramp );

    QgsVectorGradientColorRampV2 gradientRamp() const { return mGradient; }

    void selectStop( int index );

    QgsGradientStop selectedStop() const;

    virtual QSize sizeHint() const override;
    void paintEvent( QPaintEvent* event ) override;

  public slots:

    void setSelectedStopColor( const QColor& color );

    void setSelectedStopOffset( double offset );

    void setSelectedStopDetails( const QColor& color, double offset );

    void deleteSelectedStop();

    void setColor1( const QColor& color );

    void setColor2( const QColor& color );

  signals:

    void changed();

    void selectedStopChanged( const QgsGradientStop& stop );

  protected:

    virtual void mouseMoveEvent( QMouseEvent *event ) override;
    virtual void mousePressEvent( QMouseEvent *event ) override;
    virtual void mouseDoubleClickEvent( QMouseEvent * event ) override;
    virtual void keyPressEvent( QKeyEvent * event ) override;

    //Reimplemented to accept dragged colors
    void dragEnterEvent( QDragEnterEvent * e ) override;

    //Reimplemented to accept dropped colors
    void dropEvent( QDropEvent *e ) override;

  private:

    const QPixmap& transparentBackground();

    void drawStopMarker( QPainter& painter, QPoint topMiddle, const QColor& color, bool selected = false );

    double pointToRelativePosition( int x ) const;

    int relativePositionToPoint( double position ) const;

    bool selectedStopIsMovable() const;

    int findClosestStop( int x, int threshold = -1 ) const;

    QgsVectorGradientColorRampV2 mGradient;

    QgsGradientStopsList mStops;

    int mSelectedStop;

    QPolygonF sOuterTriangle;

    QPolygonF sInnerTriangle;

};

#endif // QGSGRADIENTSTOPEDITOR_H