qtdeclarative/src/plugins/qmllint/quick/quicklintplugin.cpp

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#include "quicklintplugin.h"

LayoutChildrenValidatorPass::LayoutChildrenValidatorPass(QQmlSA::PassManager *manager)
    : QQmlSA::ElementPass(manager)
{
    m_layout = resolveType("QtQuick.Layouts", "Layout");
}

bool LayoutChildrenValidatorPass::shouldRun(const QQmlSA::Element &element)
{
    return !m_layout.isNull() && element->parentScope()
            && element->parentScope()->inherits(m_layout);
}

void LayoutChildrenValidatorPass::run(const QQmlSA::Element &element)
{
    auto bindings = element->propertyBindings(u"anchors"_qs);
    if (!bindings.empty())
        emitWarning(u"Detected anchors on an item that is managed by a layout. This is undefined "
                    u"behavior; use Layout.alignment instead.",
                    element->sourceLocation());
}

void QmlLintQuickPlugin::registerPasses(QQmlSA::PassManager *manager,
                                        const QQmlSA::Element &rootElement)
{
    Q_UNUSED(rootElement);
    manager->registerElementPass(std::make_unique<LayoutChildrenValidatorPass>(manager));
}