qt-creator/src/libs/utils/detailsbutton.cpp

#include "detailsbutton.h"

#include <QtGui/QPaintEvent>
#include <QtGui/QPainter>

using namespace Utils;

DetailsButton::DetailsButton(QWidget *parent) : QAbstractButton(parent)
{
    setCheckable(true);
    setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
}

QSize DetailsButton::sizeHint() const
{
    // TODO: Adjust this when icons become available!
    return QSize(40, 22);
}


void DetailsButton::paintEvent(QPaintEvent *e)
{
    QWidget::paintEvent(e);

    QPainter p(this);
    if (isChecked()) {
        if (m_checkedPixmap.isNull() || m_checkedPixmap.size() != contentsRect().size())
            m_checkedPixmap = cacheRendering(contentsRect().size(), true);
        p.drawPixmap(contentsRect(), m_checkedPixmap);
    } else {
        if (m_uncheckedPixmap.isNull() || m_uncheckedPixmap.size() != contentsRect().size())
            m_uncheckedPixmap = cacheRendering(contentsRect().size(), false);
        p.drawPixmap(contentsRect(), m_uncheckedPixmap);
    }
}

QPixmap DetailsButton::cacheRendering(const QSize &size, bool checked)
{
    QLinearGradient lg;
    lg.setCoordinateMode(QGradient::ObjectBoundingMode);
    lg.setFinalStop(0, 1);

    if (checked) {
        lg.setColorAt(0, palette().color(QPalette::Midlight));
        lg.setColorAt(1, palette().color(QPalette::Button));
    } else {
        lg.setColorAt(0, palette().color(QPalette::Button));
        lg.setColorAt(1, palette().color(QPalette::Midlight));
    }

    QPixmap pixmap(size);
    QPainter p(&pixmap);
    p.setBrush(lg);
    p.setPen(Qt::NoPen);

    p.drawRect(0, 0, size.width() - 1, size.height() - 1);

    p.setPen(QPen(palette().color(QPalette::Mid)));
    p.drawLine(0, size.height() - 1, 0, 0);
    p.drawLine(0, 0,                 size.width() - 1, 0);
    p.drawLine(size.width() - 1, 0,  size.width() - 1, size.height() - 1);
    if (!checked)
        p.drawLine(size.width() - 1, size.height() - 1, 0, size.height() - 1);

    p.setPen(palette().color(QPalette::Text));

    // TODO: This should actually use some icons instead...
    if (checked) {
        p.drawText(0, 0, size.width(), size.height(), Qt::AlignCenter, tr("Less"));
    } else {
        p.drawText(0, 0, size.width(), size.height(), Qt::AlignCenter, tr("More"));
    }

    return pixmap;
}