ChangeListTypeCommand.cpp   [plain text]

/*
 * Copyright (C) 2018 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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#include "config.h"
#include "ChangeListTypeCommand.h"

#include "Editing.h"
#include "ElementAncestorIterator.h"
#include "Frame.h"
#include "FrameSelection.h"
#include "HTMLElement.h"
#include "HTMLOListElement.h"
#include "HTMLUListElement.h"
#include <wtf/Optional.h>
#include <wtf/RefPtr.h>

namespace WebCore {

static Optional<std::pair<ChangeListTypeCommand::Type, Ref<HTMLElement>>> listConversionTypeForSelection(const VisibleSelection& selection)
{
    auto startNode = selection.start().containerNode();
    auto endNode = selection.end().containerNode();
    if (!startNode || !endNode)
        return { };
    auto commonAncestor = commonInclusiveAncestor<ComposedTree>(*startNode, *endNode);

    RefPtr<HTMLElement> listToReplace;
    if (is<HTMLUListElement>(commonAncestor) || is<HTMLOListElement>(commonAncestor))
        listToReplace = downcast<HTMLElement>(commonAncestor);
    else
        listToReplace = enclosingList(commonAncestor);

    if (is<HTMLUListElement>(listToReplace))
        return {{ ChangeListTypeCommand::Type::ConvertToOrderedList, listToReplace.releaseNonNull() }};

    if (is<HTMLOListElement>(listToReplace))
        return {{ ChangeListTypeCommand::Type::ConvertToUnorderedList, listToReplace.releaseNonNull() }};

    return WTF::nullopt;
}

Optional<ChangeListTypeCommand::Type> ChangeListTypeCommand::listConversionType(Document& document)
{
    if (auto frame = makeRefPtr(document.frame())) {
        if (auto typeAndElement = listConversionTypeForSelection(frame->selection().selection()))
            return typeAndElement->first;
    }
    return WTF::nullopt;
}

Ref<HTMLElement> ChangeListTypeCommand::createNewList(const HTMLElement& listToReplace)
{
    RefPtr<HTMLElement> list;
    if (m_type == Type::ConvertToOrderedList)
        list = HTMLOListElement::create(document());
    else
        list = HTMLUListElement::create(document());
    list->cloneDataFromElement(listToReplace);
    return list.releaseNonNull();
}

void ChangeListTypeCommand::doApply()
{
    auto typeAndElement = listConversionTypeForSelection(endingSelection());
    if (!typeAndElement || typeAndElement->first != m_type)
        return;

    auto listToReplace = WTFMove(typeAndElement->second);
    auto newList = createNewList(listToReplace);
    insertNodeBefore(newList.copyRef(), listToReplace);
    moveRemainingSiblingsToNewParent(listToReplace->firstChild(), nullptr, newList);
    removeNode(listToReplace);
    setEndingSelection({ Position { newList.ptr(), Position::PositionIsAfterChildren }});
}

} // namespace WebCore