#ifndef BLOCKBUTTON_H
#define BLOCKBUTTON_H

#include <QtGui>

class BlockButton : public QWidget
{
    Q_OBJECT

public:
    BlockButton(QWidget *parent = 0);
    ~BlockButton(){};
private:
    QPushButton *button;
    QLineEdit *line;
    QVBoxLayout *vLay;
private slots:
    void s_blockButton(QString);
};

#endif // BLOCKBUTTON_H

#include "blockbutton.h"

BlockButton::BlockButton(QWidget *parent)
    : QWidget(parent)
{
    vLay = new QVBoxLayout;
    button = new QPushButton("Next");
    button->setDisabled(true);
    line= new QLineEdit;
    connect(line, SIGNAL(textChanged(QString)),
            this, SLOT(s_blockButton(QString)));


    vLay->addWidget(line);
    vLay->addWidget(button);
    setLayout(vLay);
}

void BlockButton::s_blockButton(QString s)
{
    if(s.isEmpty())
        button->setDisabled(true);
    else
        button->setDisabled(false);
}