Method GradientEditorDialog

src/gui/GradientEditorDialog.cpp:284–400

// ───────────────────────────────────── GradientEditorDialog ───────────────

GradientEditorDialog::GradientEditorDialog(const QString& tokenName,
                                           const ThemeGradient& initial,
                                           QWidget* parent)
    : PersistentDialog(QStringLiteral("Edit gradient — %1").arg(tokenName),
                       QStringLiteral("GradientEditorDialogGeometry"),
                       parent),
      m_tokenName(tokenName), m_gradient(initial)
{
    theme::setContainer(this, QStringLiteral("dialog/gradientEditor"));
    setModal(true);
    setMinimumSize(520, 420);
    applyAppTheme(this);
    // Inherit the global FramelessWindow setting so the chrome matches
    // whatever the main window + Theme Editor are showing.  PersistentDialog
    // owns the title-bar widget, so all we do is flip the mode here.
    setFramelessMode(AppSettings::instance()
                         .value("FramelessWindow", "True").toString() == "True");

    auto* root = new QVBoxLayout(bodyWidget());
    root->setContentsMargins(10, 10, 10, 10);
    root->setSpacing(8);

    auto* hdr = new QLabel(QStringLiteral(
        "<b>%1</b><br>Click a stop to recolor it, drag along the strip "
        "to reposition, right-click to delete, or double-click an empty "
        "spot to add a new stop.").arg(tokenName.toHtmlEscaped()), bodyWidget());
    hdr->setWordWrap(true);
    root->addWidget(hdr);

    m_strip = new GradientStrip(bodyWidget());
    root->addWidget(m_strip);

    // Stop list + per-stop buttons row.
    auto* listRow = new QHBoxLayout;
    m_stopList = new QListWidget(bodyWidget());
    m_stopList->setIconSize(QSize(18, 18));
    m_stopList->setSelectionMode(QAbstractItemView::SingleSelection);
    m_stopList->setMinimumHeight(140);
    listRow->addWidget(m_stopList, 1);

    auto* stopBtnCol = new QVBoxLayout;
    auto* addBtn  = new QPushButton(QStringLiteral("+ Add stop"), bodyWidget());
    auto* delBtn  = new QPushButton(QStringLiteral("− Delete stop"), bodyWidget());
    auto* editBtn = new QPushButton(QStringLiteral("Edit color…"), bodyWidget());
    stopBtnCol->addWidget(addBtn);
    stopBtnCol->addWidget(delBtn);
    stopBtnCol->addWidget(editBtn);
    stopBtnCol->addStretch(1);
    listRow->addLayout(stopBtnCol);
    root->addLayout(listRow);

    // Angle row — only meaningful for linear gradients.
    auto* angleRow = new QHBoxLayout;
    m_angleLabel = new QLabel(QStringLiteral("Angle:"), bodyWidget());
    angleRow->addWidget(m_angleLabel);
    m_angleSpin = new QSpinBox(bodyWidget());
    m_angleSpin->setRange(0, 360);
    m_angleSpin->setSuffix(QStringLiteral("°"));