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Файл примера window.cpp
layouts/flowlayout/window.cpp

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 #include <QtGui>

 #include "flowlayout.h"
 #include "window.h"
 Window::Window()
 {
     FlowLayout *flowLayout = new FlowLayout;

     flowLayout->addWidget(new QPushButton(tr("Short")));
     flowLayout->addWidget(new QPushButton(tr("Longer")));
     flowLayout->addWidget(new QPushButton(tr("Different text")));
     flowLayout->addWidget(new QPushButton(tr("More text")));
     flowLayout->addWidget(new QPushButton(tr("Even longer button text")));
     setLayout(flowLayout);

     setWindowTitle(tr("Flow Layout"));
 }