#ifndef _PAYSAGES_QT_BASEPREVIEW_H_
#define _PAYSAGES_QT_BASEPREVIEW_H_

#include <QMutex>
#include <QImage>
#include <QWidget>
#include <QThread>

class BasePreview:public QWidget
{
    Q_OBJECT

public:
    BasePreview(QWidget* parent);
    ~BasePreview();

    void start();
    void doRender();
    void redraw();

protected:
    virtual void updateData();
    virtual QColor getColor(double x, double y);
    
    void configScaling(double min, double max, double step, double init, bool logarithmic=true);
    void configScrolling(double xmin, double xmax, double xinit, double ymin, double ymax, double yinit);

    double xoffset;
    double yoffset;
    double scaling;

private:
    void renderPixbuf();
    void updateScaling();

    void resizeEvent(QResizeEvent* event);
    void paintEvent(QPaintEvent* event);
    
    void mousePressEvent(QMouseEvent* event);
    void mouseMoveEvent(QMouseEvent* event);
    void wheelEvent(QWheelEvent* event);

    QThread* updater;

    QMutex* lock_drawing;
    QImage* pixbuf;

    int mousex;
    int mousey;

    double scalingbase;

    bool alive;
    bool need_restart;
    bool need_render;

    double conf_scroll_xmin;
    double conf_scroll_xmax;
    double conf_scroll_xinit;
    double conf_scroll_ymin;
    double conf_scroll_ymax;
    double conf_scroll_yinit;

    double conf_scale_min;
    double conf_scale_max;
    double conf_scale_init;
    double conf_scale_step;
    bool conf_scroll_logarithmic;

signals:
    void contentChange();
    void redrawRequested();

private slots:
    void handleRedraw();
};

#endif