Method paintEvent

src/gui/ClientCompThresholdFader.cpp:178–279

}

void ClientCompThresholdFader::paintEvent(QPaintEvent*)
{
    QPainter p(this);
    p.setRenderHint(QPainter::Antialiasing, false);
    p.setRenderHint(QPainter::TextAntialiasing, true);

    // Strip vertical bounds — carve between the THRESH label and the
    // numeric value label.
    const int topLabelH = 16;
    const int botLabelH = 14;
    const int stripTop  = topLabelH + kStripTopPad;
    const int stripBot  = height() - botLabelH - kStripBottomPad;
    m_stripTop = stripTop;
    m_stripH   = std::max(1, stripBot - stripTop);

    const int barLeft = kLabelColW + kGap + kHandleOverhang;
    const QRect barR(barLeft, stripTop, kBarW, m_stripH);

    p.fillRect(barR, AetherSDR::ThemeManager::instance().color("color.background.0"));

    // Level fill — same green→amber→red gradient as the output fader so
    // the metering vocabulary is consistent across the app.
    const float peakNorm = std::clamp(
        (m_smoothedPeakDb - kMeterMinDb) / (kMeterMaxDb - kMeterMinDb),
        0.0f, 1.0f);
    const int fillH = static_cast<int>(peakNorm * m_stripH);
    if (fillH > 0) {
        const QRect fill(barR.x(), barR.y() + m_stripH - fillH,
                         kBarW, fillH);
        QLinearGradient grad(0, barR.y() + m_stripH, 0, barR.y());
        grad.setColorAt(0.0, AetherSDR::ThemeManager::instance().color("color.accent.success"));
        grad.setColorAt(0.55, AetherSDR::ThemeManager::instance().color("color.accent.success"));
        grad.setColorAt(0.80, AetherSDR::ThemeManager::instance().color("color.accent.warning"));
        grad.setColorAt(0.95, AetherSDR::ThemeManager::instance().color("color.accent.danger"));
        grad.setColorAt(1.0, AetherSDR::ThemeManager::instance().color("color.accent.danger"));
        p.fillRect(fill, grad);
    }

    p.setPen(QPen(AetherSDR::ThemeManager::instance().color("color.background.1"), 1));
    p.setBrush(Qt::NoBrush);
    p.drawRect(barR.adjusted(0, 0, -1, -1));

    // dB scale on the left.
    QFont f = p.font();
    f.setPixelSize(9);
    p.setFont(f);
    const QFontMetrics fm(f);
    const int textRight = kLabelColW - 2;

    struct Tick { float db; const char* label; };
    static constexpr Tick kTicks[] = {
        {   0.0f,  "0" },
        { -12.0f,  "-12" },
        { -24.0f,  "-24" },
        { -36.0f,  "-36" },
        { -48.0f,  "-48" },
    };
    for (const auto& t : kTicks) {