bool VisiblePosition::isCandidate(const Position &pos)
{
if (pos.isNull())
return false;
RenderObject *renderer = pos.node()->renderer();
if (!renderer)
return false;
if (renderer->style()->visibility() != VISIBLE)
return false;
if (renderer->isReplaced())
// return true for replaced elements
return pos.offset() == 0 || pos.offset() == 1;
if (renderer->isBR()) {
if (pos.offset() == 0) {
InlineBox* box = static_cast<RenderText*>(renderer)->firstTextBox();
if (box) {
// return true for offset 0 into BR element on a line by itself
RootInlineBox* root = box->root();
if (root)
return root->firstLeafChild() == box && root->lastLeafChild() == box;
}
}
return false;
}
if (renderer->isText()) {
RenderText *textRenderer = static_cast<RenderText *>(renderer);
for (InlineTextBox *box = textRenderer->firstTextBox(); box; box = box->nextTextBox()) {
if (pos.offset() >= box->m_start && pos.offset() <= box->m_start + box->m_len) {
// return true if in a text node
return true;
}
}
}
if (renderer->isBlockFlow() && (!renderer->firstChild() || !pos.node()->firstChild()) &&
(renderer->height() || pos.node()->id() == ID_BODY)) {
// return true for offset 0 into rendered blocks that are empty of rendered kids, but have a height
return pos.offset() == 0;
}
return false;
}
static VisiblePosition endPositionForLine(const VisiblePosition& c)
{
if (c.isNull())
return VisiblePosition();
RootInlineBox *rootBox = rootBoxForLine(c);
if (!rootBox) {
// There are VisiblePositions at offset 0 in blocks without
// RootInlineBoxes, like empty editable blocks and bordered blocks.
Position p = c.deepEquivalent();
if (p.node()->renderer() && p.node()->renderer()->isRenderBlock() && p.deprecatedEditingOffset() == 0)
return c;
return VisiblePosition();
}
// Generated content (e.g. list markers and CSS :before and :after
// pseudoelements) have no corresponding DOM element, and so cannot be
// represented by a VisiblePosition. Use whatever precedes instead.
Node *endNode;
InlineBox *endBox = rootBox->lastLeafChild();
while (1) {
if (!endBox)
return VisiblePosition();
RenderObject *endRenderer = endBox->renderer();
if (!endRenderer)
return VisiblePosition();
endNode = endRenderer->node();
if (endNode)
break;
endBox = endBox->prevLeafChild();
}
int endOffset = 1;
if (endNode->hasTagName(brTag)) {
endOffset = 0;
} else if (endBox->isInlineTextBox()) {
InlineTextBox *endTextBox = static_cast<InlineTextBox *>(endBox);
endOffset = endTextBox->start();
if (!endTextBox->isLineBreak())
endOffset += endTextBox->len();
}
return VisiblePosition(endNode, endOffset, VP_UPSTREAM_IF_POSSIBLE);
}