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Файл примера arrowpad.cpp
linguist/arrowpad/arrowpad.cpp

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 #include <QtGui>

 #include "arrowpad.h"

 ArrowPad::ArrowPad(QWidget *parent)
     : QWidget(parent)
 {
     upButton = new QPushButton(tr("&Up"));
     downButton = new QPushButton(tr("&Down"));
     leftButton = new QPushButton(tr("&Left"));
     rightButton = new QPushButton(tr("&Right"));

     QGridLayout *mainLayout = new QGridLayout;
     mainLayout->addWidget(upButton, 0, 1);
     mainLayout->addWidget(leftButton, 1, 0);
     mainLayout->addWidget(rightButton, 1, 2);
     mainLayout->addWidget(downButton, 2, 1);
     setLayout(mainLayout);
 }