bool Position::inRenderedContent() const
{
if (isNull())
return false;
RenderObject *renderer = node()->renderer();
if (!renderer)
return false;
if (renderer->style()->visibility() != VISIBLE)
return false;
// FIXME: This check returns false for a <br> at the end of a line!
if (renderer->isBR() && static_cast<RenderText *>(renderer)->firstTextBox()) {
return offset() == 0;
}
else if (renderer->isText()) {
RenderText *textRenderer = static_cast<RenderText *>(renderer);
for (InlineTextBox *box = textRenderer->firstTextBox(); box; box = box->nextTextBox()) {
if (offset() >= box->m_start && offset() <= box->m_start + box->m_len) {
return true;
}
else if (offset() < box->m_start) {
// The offset we're looking for is before this node
// this means the offset must be in content that is
// not rendered. Return false.
return false;
}
}
}
else if (offset() >= renderer->caretMinOffset() && offset() <= renderer->caretMaxOffset()) {
// return true for replaced elements, for inline flows if they have a line box
// and for blocks if they are empty
if (renderer->isReplaced() ||
(renderer->isInlineFlow() && static_cast<RenderFlow *>(renderer)->firstLineBox()) ||
(renderer->isBlockFlow() && !renderer->firstChild() && renderer->height()))
return true;
}
return false;
}
int caretMinOffset(const Node* n)
{
RenderObject* r = n->renderer();
ASSERT(!n->isCharacterDataNode() || !r || r->isText()); // FIXME: This was a runtime check that seemingly couldn't fail; changed it to an assertion for now.
return r ? r->caretMinOffset() : 0;
}
Position Position::downstream(EStayInBlock stayInBlock) const
{
Position start = equivalentDeepPosition();
NodeImpl *startNode = start.node();
if (!startNode)
return Position();
NodeImpl *block = startNode->enclosingBlockFlowOrTableElement();
Position lastVisible;
PositionIterator it(start);
for (; !it.atEnd(); it.next()) {
NodeImpl *currentNode = it.current().node();
if (stayInBlock) {
NodeImpl *currentBlock = currentNode->enclosingBlockFlowOrTableElement();
if (block != currentBlock)
return it.previous();
}
RenderObject *renderer = currentNode->renderer();
if (!renderer)
continue;
if (renderer->style()->visibility() != VISIBLE)
continue;
lastVisible = it.current();
if (currentNode != startNode && renderer->isBlockFlow()) {
if (it.current().offset() == 0) {
// If no first child, or first visible child is a not a block, return; otherwise continue.
if (!currentNode->firstChild())
return Position(currentNode, 0);
for (NodeImpl *child = currentNode->firstChild(); child; child = child->nextSibling()) {
RenderObject *r = child->renderer();
if (r && r->style()->visibility() == VISIBLE) {
if (r->isBlockFlow())
break; // break causes continue code below to run.
else
return Position(child, 0);
}
}
continue;
}
}
if (renderer->isReplaced() || renderer->isBR()) {
if (it.current().offset() <= renderer->caretMinOffset())
return Position(currentNode, renderer->caretMinOffset());
else
continue;
}
if (renderer->isText() && static_cast<RenderText *>(renderer)->firstTextBox()) {
if (currentNode != start.node())
return Position(currentNode, renderer->caretMinOffset());
if (it.current().offset() < 0)
continue;
uint textOffset = it.current().offset();
RenderText *textRenderer = static_cast<RenderText *>(renderer);
for (InlineTextBox *box = textRenderer->firstTextBox(); box; box = box->nextTextBox()) {
if (textOffset >= box->start() && textOffset <= box->end())
return it.current();
else if (box != textRenderer->lastTextBox() &&
!box->nextOnLine() &&
textOffset == box->start() + box->len())
return it.current();
}
}
}
return lastVisible.isNotNull() ? lastVisible : *this;
}
// P.downstream() returns the end of the range of positions that map to the same VisiblePosition as P.
Position Position::downstream() const
{
Node* startNode = node();
if (!startNode)
return Position();
// iterate forward from there, looking for a qualified position
Node* block = enclosingBlock(startNode);
PositionIterator lastVisible = *this;
PositionIterator currentPos = lastVisible;
Node* originalRoot = node()->rootEditableElement();
for (; !currentPos.atEnd(); currentPos.increment()) {
Node* currentNode = currentPos.node();
if (currentNode->rootEditableElement() != originalRoot)
break;
// stop before going above the body, up into the head
// return the last visible streamer position
if (currentNode->hasTagName(bodyTag) && currentPos.atEndOfNode())
break;
// Do not enter a new enclosing block flow or table element, and don't leave the original one.
if (block != enclosingBlock(currentNode))
return lastVisible;
// skip position in unrendered or invisible node
RenderObject* renderer = currentNode->renderer();
if (!renderer || renderer->style()->visibility() != VISIBLE)
continue;
// track last visible streamer position
if (isStreamer(currentPos))
lastVisible = currentPos;
// Return position before brs, tables, and nodes which have content that can be ignored.
if (editingIgnoresContent(currentNode) || renderer->isBR() || isTableElement(currentNode)) {
if (currentPos.offsetInLeafNode() <= renderer->caretMinOffset())
return Position(currentNode, renderer->caretMinOffset());
continue;
}
// return current position if it is in rendered text
if (renderer->isText() && static_cast<RenderText*>(renderer)->firstTextBox()) {
if (currentNode != startNode) {
ASSERT(currentPos.atStartOfNode());
return Position(currentNode, renderer->caretMinOffset());
}
unsigned textOffset = currentPos.offsetInLeafNode();
RenderText* textRenderer = static_cast<RenderText*>(renderer);
for (InlineTextBox* box = textRenderer->firstTextBox(); box; box = box->nextTextBox()) {
if (textOffset >= box->start() && textOffset <= box->end())
return currentPos;
if (box != textRenderer->lastTextBox() &&
!box->nextOnLine() &&
textOffset == box->start() + box->len()) {
return currentPos;
}
}
}
}
return lastVisible;
}