mdichild.h Example File
mainwindows/mdi/mdichild.h

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 #ifndef MDICHILD_H
 #define MDICHILD_H

 #include <QTextEdit>

 class MdiChild : public QTextEdit
 {
     Q_OBJECT

 public:
     MdiChild();

     void newFile();
     bool loadFile(const QString &fileName);
     bool save();
     bool saveAs();
     bool saveFile(const QString &fileName);
     QString userFriendlyCurrentFile();
     QString currentFile() { return curFile; }

 protected:
     void closeEvent(QCloseEvent *event);

 private slots:
     void documentWasModified();

 private:
     bool maybeSave();
     void setCurrentFile(const QString &fileName);
     QString strippedName(const QString &fullFileName);

     QString curFile;
     bool isUntitled;
 };

 #endif