Method paintEvent

src/gui/KeyboardMapWidget.cpp:224–316

// ─── Painting ───────────────────────────────────────────────────────────────

void KeyboardMapWidget::paintEvent(QPaintEvent*)
{
    QPainter p(this);
    p.setRenderHint(QPainter::Antialiasing);
    p.fillRect(rect(), AetherSDR::ThemeManager::instance().color("color.background.0"));

    // Compute key unit size to fit the layout (23 key units wide for main + numpad)
    constexpr float totalKeysW = 23.5f;
    constexpr float totalKeysH = 6.5f;
    constexpr float gap = 0.08f;

    float availW = width() - 20;
    float availH = height() - 20;
    float unitFromW = availW / (totalKeysW * (1 + gap));
    float unitFromH = availH / (totalKeysH * (1 + gap));
    m_keyUnit = std::min(unitFromW, unitFromH);
    m_originX = 10;
    m_originY = 10;

    QFont keyFont;
    keyFont.setPixelSize(std::max(8, static_cast<int>(m_keyUnit * 0.28f)));
    keyFont.setBold(true);

    QFont actionFont;
    actionFont.setPixelSize(std::max(6, static_cast<int>(m_keyUnit * 0.18f)));

    for (int i = 0; i < m_keys.size(); ++i) {
        const auto& k = m_keys[i];
        QRectF r = keyRect(k);

        // Look up bound action
        QKeySequence seq(k.qtKey);
        const auto* act = m_mgr->actionForKey(seq);

        // Determine colors
        QColor fill = kUnboundFill();
        QColor border = kUnboundBorder();
        if (act) {
            fill = categoryColor(act->category);
            border = fill.lighter(140);
        }

        // Hover highlight
        if (i == m_hoverIdx) {
            fill = fill.lighter(130);
            border = border.lighter(130);
        }

        // Selected highlight
        if (i == m_selectedIdx) {
            border = AetherSDR::ThemeManager::instance().color("color.accent");
            fill = fill.lighter(150);
        }

        // Keyboard focus ring (shown when widget has focus)
        if (i == m_focusIdx && hasFocus()) {
            border = QColor(0xff, 0xff, 0x00);  // yellow focus ring
        }