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/media/disk/NvhTool/plotter.cpp:12: error: invalid use of incomplete type ‘struct QToolButton’

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#include "plotter.h"

Plotter::Plotter(QWidget *parent) :
    QWidget(parent)
{
    setBackgroundRole(QPalette::Dark);
    setAutoFillBackground(true);
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    setFocusPolicy(Qt::StrongFocus);
    RubberBandIsShown = false;

    ZoomInButton = new QToolButton(this);        // hier stimmt was nicht!
    ZoomInButton->setIcon(QIcon(":/Button_zoom_in.png"));
    ZoomInButton->adjustSize();
    connect(ZoomInButton, SIGNAL(clicked()), this, SLOT(zoomIn()));

    ZoomOutButton = new QToolButton(this);
    ZoomOutButton->setIcon(QIcon(":/Button_zoom_in.png"));
    ZoomOutButton->adjustSize();
    connect(ZoomOutButton, SIGNAL(clicked()), this, SLOT(zoomOut()));

    setPlotSettings(cPlotSettings());

}

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/media/disk/NvhTool/plotter.h:11: error: forward declaration of ‘struct QToolButton’

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#ifndef PLOTTER_H
#define PLOTTER_H

#include <QWidget>

#include <QMap>
#include <QPixmap>
#include <QVector>


class QToolButton;         // hier stimmt was nicht!!! Zeile 11
class PlotSettings;


class Plotter : public QWidget
{
Q_OBJECT
public:
    Plotter(QWidget *parent = 0);

    void setPlotSettings(const PlotSettings &settings);
    void setCurveData (int id, const QVector<QPointF> &data);
    void clearCurve(int Id);
    QSize minimumSizeHint() const;
    QSize sizeHint() const;



signals:

public slots:

    void zoomIn();
    void zoomOut();

protected:
    void paintEvent(QPaintEvent *event);
    void resizeEvent(QResizeEvent *event);
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);
    void keyPressEvent(QKeyEvent *event);
    void wheelEvent(QWheelEvent *event);


private:
    void updateRubberBandRegion();
    void refreshPixmap();
    void drawGrid(QPainter *painter);
    void drawCurves(QPainter *painter);

    enum {Margin = 50};

    QToolButton *ZoomInButton;
    QToolButton *ZoomOutButton;
    QMap <int, QVector<QPointF> >CurveMap;
    QVector<PlotSettings> ZoomStack;
    int CurZoom;
    bool RubberBandIsShown;
    QRect RubberBandRect;
    QPixmap Pixmap;

};

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#include <QToolButton>