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Файл примера echowindow.h
tools/echoplugin/echowindow/echowindow.h

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 #ifndef ECHODIALOG_H
 #define ECHODIALOG_H

 #include <QWidget>

 #include "echointerface.h"

 class QString;
 class QLineEdit;
 class QLabel;
 class QPushButton;
 class QGridLayout;

 class EchoWindow : public QWidget
 {
     Q_OBJECT

 public:
     EchoWindow();

 private slots:
     void sendEcho();

 private:
     void createGUI();
     bool loadPlugin();

     EchoInterface *echoInterface;
     QLineEdit *lineEdit;
     QLabel *label;
     QPushButton *button;
     QGridLayout *layout;
 };

 #endif