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

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    **
    ** This file is part of the example classes of the Qt Toolkit.
    **
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    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
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    ** information about Qt Commercial License Agreements.
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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;
    }