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# button.cpp Example File
widgets/calculator/button.cpp

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     #include <QtGui>

     #include "button.h"

     Button::Button(const QString &text, const QColor &color, QWidget *parent)
         : QToolButton(parent)
     {
         setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
         setText(text);

         QPalette newPalette = palette();
         newPalette.setColor(QPalette::Button, color);
         setPalette(newPalette);
     }

     QSize Button::sizeHint() const
     {
         QSize size = QToolButton::sizeHint();
         size.rheight() += 20;
         size.rwidth() = qMax(size.width(), size.height());
         return size;
     }