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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;
}


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Qt 4.2.0-rc1