textedit.h Example File
demos/textedit/textedit.h

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 #ifndef TEXTEDIT_H
 #define TEXTEDIT_H

 #include <QMainWindow>
 #include <QMap>
 #include <QPointer>

 QT_FORWARD_DECLARE_CLASS(QAction)
 QT_FORWARD_DECLARE_CLASS(QComboBox)
 QT_FORWARD_DECLARE_CLASS(QFontComboBox)
 QT_FORWARD_DECLARE_CLASS(QTextEdit)
 QT_FORWARD_DECLARE_CLASS(QTextCharFormat)
 QT_FORWARD_DECLARE_CLASS(QMenu)

 class TextEdit : public QMainWindow
 {
     Q_OBJECT

 public:
     TextEdit(QWidget *parent = 0);

 protected:
     virtual void closeEvent(QCloseEvent *e);

 private:
     void setupFileActions();
     void setupEditActions();
     void setupTextActions();
     bool load(const QString &f);
     bool maybeSave();
     void setCurrentFileName(const QString &fileName);

 private slots:
     void fileNew();
     void fileOpen();
     bool fileSave();
     bool fileSaveAs();
     void filePrint();
     void filePrintPreview();
     void filePrintPdf();

     void textBold();
     void textUnderline();
     void textItalic();
     void textFamily(const QString &f);
     void textSize(const QString &p);
     void textStyle(int styleIndex);
     void textColor();
     void textAlign(QAction *a);

     void currentCharFormatChanged(const QTextCharFormat &format);
     void cursorPositionChanged();

     void clipboardDataChanged();
     void about();
     void printPreview(QPrinter *);

 private:
     void mergeFormatOnWordOrSelection(const QTextCharFormat &format);
     void fontChanged(const QFont &f);
     void colorChanged(const QColor &c);
     void alignmentChanged(Qt::Alignment a);

     QAction *actionSave,
         *actionTextBold,
         *actionTextUnderline,
         *actionTextItalic,
         *actionTextColor,
         *actionAlignLeft,
         *actionAlignCenter,
         *actionAlignRight,
         *actionAlignJustify,
         *actionUndo,
         *actionRedo,
         *actionCut,
         *actionCopy,
         *actionPaste;

     QComboBox *comboStyle;
     QFontComboBox *comboFont;
     QComboBox *comboSize;

     QToolBar *tb;
     QString fileName;
     QTextEdit *textEdit;
 };

 #endif