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Файл примера window.h
widgets/lineedits/window.h

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 #ifndef WINDOW_H
 #define WINDOW_H

 #include <QWidget>

 class QComboBox;
 class QLineEdit;

 class Window : public QWidget
 {
     Q_OBJECT

 public:
     Window();

 public slots:
     void echoChanged(int);
     void validatorChanged(int);
     void alignmentChanged(int);
     void inputMaskChanged(int);
     void accessChanged(int);

 private:
     QLineEdit *echoLineEdit;
     QLineEdit *validatorLineEdit;
     QLineEdit *alignmentLineEdit;
     QLineEdit *inputMaskLineEdit;
     QLineEdit *accessLineEdit;
 };

 #endif