Method AppletPanel

src/gui/AppletPanel.cpp:182–967

// ── AppletPanel ──────────────────────────────────────────────────────────────

AppletPanel::AppletPanel(QWidget* parent) : QWidget(parent)
{
    // Parent container for every applet hosted in this rail.  Each
    // individual applet declares its own child scope ("applet.tx",
    // "applet.rx", …) inside its own constructor so widgets inside
    // an applet inherit applet.<name> → applet → root.
    theme::setContainer(this, QStringLiteral("applet"));

    setFixedWidth(260);

    auto* root = new QVBoxLayout(this);
    root->setContentsMargins(0, 0, 0, 0);
    root->setSpacing(0);

    // ── Top button bar: single favorites row + push-down drawer ────────────
    //
    // The bar shows kFavoriteCount (5) user-chosen "favorite" buttons in a
    // single row, with a 6th slot acting as the drawer toggle (▾/▴).
    // Toggling the drawer reveals/hides a grid containing every other
    // bar button.  Right-click any bar button to open the picker dialog.
    //
    // Construction: every bar button (LCK, VU, RX, …) is created with the
    // drawer's widget+layout as its rowParent/rowLayout.  Once all are
    // registered, applyBarLayout() lifts the favorites out of the drawer
    // into m_favRow.  See registerBarButton() / applyBarLayout().
    //
    // All colour values resolved through ThemeManager so the bar
    // re-themes live alongside the rest of the UI.
    const QString kBarContainerStyle =
        QStringLiteral("QWidget#barContainer { background: {{color.background.0}}; }");
    const QString kBarBtnStyle =
        QStringLiteral(
            "QPushButton { background: {{color.background.1}}; "
            "border: 1px solid {{color.background.2}}; border-radius: 3px; "
            "padding: 2px 3px; font-size: 11px; font-weight: bold; "
            "color: {{color.text.primary}}; }"
            "QPushButton:hover { background: {{color.background.2}}; }"
            // Active/checked state mirrors the kBlueActive style used by
            // the RxApplet filter-preset buttons (1.8K/2.1K/…): dim cyan
            // fill, light text, slightly brighter outline.
            "QPushButton:checked { background: {{color.accent.dim}}; "
            "color: {{color.text.primary}}; "
            "border: 1px solid {{color.accent.bright}}; }"
            "QPushButton:disabled { color: {{color.text.disabled}}; "
            "border-color: {{color.background.1}}; }");

    m_favRow = new QWidget;
    m_favRow->setObjectName("barContainer");
    ThemeManager::instance().applyStyleSheet(m_favRow, kBarContainerStyle + kBarBtnStyle);
    m_favLayout = new QGridLayout(m_favRow);
    m_favLayout->setContentsMargins(2, 3, 2, 3);
    m_favLayout->setSpacing(2);
    root->addWidget(m_favRow);

    m_drawer = new QWidget;
    m_drawer->setObjectName("barContainer");
    ThemeManager::instance().applyStyleSheet(m_drawer, kBarContainerStyle + kBarBtnStyle +
        QStringLiteral("QWidget#barContainer { border-bottom: 1px solid {{color.border.subtle}}; }"));