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#ifndef IMAGEVIEWER_H
#define IMAGEVIEWER_H

#include <QMainWindow>
#include <QPrinter>
#include <QtGui>
#include <QResizeEvent>
#include <QPushButton>
#include <QSlider>
#include <QColor>

#include "fstream"

class QAction;
class QLabel;
class QMenu;
class QScrollArea;
class QScrollBar;
class QTextEdit;
class QVBoxLayout;
class QTabWidget;
class QPushButton;
class QSpinBox;

class ImageViewer : public QMainWindow {
  Q_OBJECT

  private:
    // Beispiel für GUI Elemente
    QWidget* m_option_panel1;
    QVBoxLayout* m_option_layout1;

    QWidget* m_option_panel2;
    QVBoxLayout* m_option_layout2;

    QPushButton* button1;
    QPushButton* button2;
    QPushButton* button3;
    QPushButton* button4;
    QSpinBox* spinbox1;

    // hier können weitere GUI Objekte hin wie Buttons Slider etc.
    QSlider* lineSlider;

  private slots:
    // Beispiel für einen Algorithmus
    void drawBlackLine();

    // hier können weitere als SLOTS definierte Funktionen hin, die auf Knopfdruck etc. aufgerufen werden.
    void drawRainbowCross();
    void drawDiagonalCross();
    void acidTrippin();

    void open();
    void print();
    void zoomIn();
    void zoomOut();
    void normalSize();
    void fitToWindow();
    void about();
     
  public:
    ImageViewer();
    bool loadFile(const QString &);
    void updateImageDisplay();

  protected:
    void resizeEvent(QResizeEvent * event);

  private:
    void drawRainbowCross(int h); 
    // in diesen Beiden Methoden sind Änderungen nötig bzw. sie dienen als
    // Vorlage für eigene Methoden.
    void generateControlPanels();

    // Ab hier technische Details die nicht für das Verständnis notwendig sind.
    void startLogging();
    void generateMainGui(); 

    void createActions();
    void createMenus();
    void updateActions();
    void scaleImage(double factor);
    void adjustScrollBar(QScrollBar *scrollBar, double factor);

    void renewLogging();

    QTabWidget* tabWidget;
    QTextEdit* logBrowser;
    QWidget* centralwidget;
    QLabel* imageLabel;
    QScrollArea* scrollArea;
    double scaleFactor;
    QImage* image;

    std::fstream logFile;

#ifndef QT_NO_PRINTER
    QPrinter printer;
#endif

    QAction *openAct;
    QAction *printAct;
    QAction *exitAct;
    QAction *zoomInAct;
    QAction *zoomOutAct;
    QAction *normalSizeAct;
    QAction *fitToWindowAct;
    QAction *aboutAct;
    QAction *aboutQtAct;

    QMenu *fileMenu;
    QMenu *viewMenu;
    QMenu *helpMenu;
};
#endif