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textedit.h Example File
tools/customcompleter/textedit.h

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 #ifndef TEXTEDIT_H
 #define TEXTEDIT_H

 #include <QTextEdit>

 class QCompleter;

 class TextEdit : public QTextEdit
 {
     Q_OBJECT

 public:
     TextEdit(QWidget *parent = 0);
     ~TextEdit();

     void setCompleter(QCompleter *c);
     QCompleter *completer() const;

 protected:
     void keyPressEvent(QKeyEvent *e);
     void focusInEvent(QFocusEvent *e);

 private slots:
     void insertCompletion(const QString &completion);

 private:
     QString textUnderCursor() const;

 private:
     QCompleter *c;
 };

 #endif // TEXTEDIT_H