Function createColorIcon

gui/guiutils.cpp:269–328

}

QIcon createColorIcon(const QList<QColor> &colors, const QIcon &background, ColorIconFlags flags)
{
    QIcon colorIcon;

    // Create a pixmap for each common icon size.
    for (int size : {16, 22, 24, 32, 48}) {
        QPixmap pixmap(QSize(size, size) * qApp->devicePixelRatio());
        pixmap.setDevicePixelRatio(qApp->devicePixelRatio());
        pixmap.fill(Qt::transparent);
        QPainter painter(&pixmap);
        // Configure hairlines for visualization of outline or transparency (visualizeTransparent):
        painter.setPen(QPen(qApp->palette().color(QPalette::Active, QPalette::WindowText), 0));
        painter.setBrush(Qt::NoBrush);

        if (background.isNull()) {
            // Full-size color rectangles.
            // Draw rectangles left to right:
            for (int i = 0; i < colors.count(); ++i) {
                if (!colors.at(i).isValid()) {
                    continue;
                }
                QRect rect(QPoint(size * i / colors.count(), 0), QPoint(size * (i + 1) / colors.count(), size));
                if ((flags & VisualizeTransparent) && (colors.at(i) == Qt::transparent)) {
                    painter.drawLine(rect.topLeft(), rect.bottomRight());
                    painter.drawLine(rect.bottomLeft(), rect.topRight());
                } else {
                    painter.fillRect(rect, colors.at(i));
                }
            }

            // Draw hairline outline:
            // To get the hairline on the outermost pixels, we shrink the rectangle by a half pixel on each edge.
            const qreal halfPixelWidth = 0.5 / pixmap.devicePixelRatio();
            painter.drawRect(QRectF(QPointF(halfPixelWidth, halfPixelWidth), QPointF(qreal(size) - halfPixelWidth, qreal(size) - halfPixelWidth)));
        } else {
            // Lower 25% color rectangles.
            // Draw background icon:
            background.paint(&painter, QRect(QPoint(0, 0), QSize(size, size)));

            // Draw rectangles left to right:
            for (int i = 0; i < colors.count(); ++i) {
                if (!colors.at(i).isValid()) {
                    continue;
                }
                QRect rect(QPoint(size * i / colors.count(), size * 3 / 4), QPoint(size * (i + 1) / colors.count(), size));
                if ((flags & VisualizeTransparent) && (colors.at(i) == Qt::transparent)) {
                    painter.drawLine(rect.topLeft(), rect.bottomRight());
                    painter.drawLine(rect.bottomLeft(), rect.topRight());
                } else {
                    painter.fillRect(rect, colors.at(i));
                }
            }
        }

        painter.end();
        colorIcon.addPixmap(pixmap);
    }