CG2_Tasks/imageviewer-qt4.h

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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