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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


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Qt 4.0.0