TextDirection SelectionModifier::directionOfSelection() const {
InlineBox* startBox = nullptr;
InlineBox* endBox = nullptr;
// Cache the VisiblePositions because visibleStart() and visibleEnd()
// can cause layout, which has the potential to invalidate lineboxes.
VisiblePosition startPosition = m_selection.visibleStart();
VisiblePosition endPosition = m_selection.visibleEnd();
if (startPosition.isNotNull())
startBox = computeInlineBoxPosition(startPosition).inlineBox;
if (endPosition.isNotNull())
endBox = computeInlineBoxPosition(endPosition).inlineBox;
if (startBox && endBox && startBox->direction() == endBox->direction())
return startBox->direction();
return directionOfEnclosingBlock();
}
RenderedPosition::RenderedPosition(const Position& position, TextAffinity affinity)
: m_layoutObject(nullptr)
, m_inlineBox(nullptr)
, m_offset(0)
, m_prevLeafChild(uncachedInlineBox())
, m_nextLeafChild(uncachedInlineBox())
{
if (position.isNull())
return;
InlineBoxPosition boxPosition = computeInlineBoxPosition(position, affinity);
m_inlineBox = boxPosition.inlineBox;
m_offset = boxPosition.offsetInBox;
if (m_inlineBox)
m_layoutObject = &m_inlineBox->layoutObject();
else
m_layoutObject = layoutObjectFromPosition(position);
}
