qt-material-widgets/components/materiallib/qtmaterialcheckable_internal.cpp

#include <lib/qtmaterialcheckable_internal.h>
#include <lib/qtmaterialcheckable.h>

#include <QIcon>
#include <QPainter>
#include <QTransform>

/*!
 *  \class QtMaterialCheckableIcon
 *  \internal
 */

QtMaterialCheckableIcon::QtMaterialCheckableIcon(const QIcon &icon, QtMaterialCheckable *parent)
    : QWidget(parent)
    , m_checkable(parent)
    , m_color(Qt::black)
    , m_icon(icon)
    , m_iconSize(24)
    , m_opacity(1.0)
{
    Q_ASSERT(parent);

    setAttribute(Qt::WA_TransparentForMouseEvents);
}

QtMaterialCheckableIcon::~QtMaterialCheckableIcon() {}

QSize QtMaterialCheckableIcon::sizeHint() const
{
    return QSize(m_iconSize, m_iconSize);
}

void QtMaterialCheckableIcon::paintEvent(QPaintEvent *event)
{
    Q_UNUSED(event)

    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.setOpacity(m_opacity);

    QPixmap pixmap = icon().pixmap(24, 24);

    if (!pixmap.isNull()) {
        const qreal p = static_cast<qreal>((height()) - m_iconSize) / 2;
        const qreal z = m_iconSize / 24;

        QTransform t;
        if (QtMaterialCheckable::LabelPositionLeft == m_checkable->labelPosition()) {
            t.translate(p + width() - 42, p);
        } else {
            t.translate(p, p);
        }
        t.scale(z, z);
        painter.setTransform(t);

        QPainter icon(&pixmap);
        icon.setCompositionMode(QPainter::CompositionMode_SourceIn);
        icon.fillRect(pixmap.rect(), color());
        painter.drawPixmap(0, 0, pixmap);
    }
}