bool HTMLAnchorElement::isKeyboardFocusable(KeyboardEvent* event) const
{
if (!isFocusable())
return false;
if (!document()->frame())
return false;
if (!document()->frame()->eventHandler()->tabsToLinks(event))
return false;
if (!renderer() || !renderer()->isBox())
return false;
// Before calling absoluteRects, check for the common case where the renderer
// is non-empty, since this is a faster check and almost always returns true.
RenderBox* box = toRenderBox(renderer());
if (!box->borderBoundingBox().isEmpty())
return true;
Vector<IntRect> rects;
FloatPoint absPos = renderer()->localToAbsolute();
renderer()->absoluteRects(rects, absPos.x(), absPos.y());
size_t n = rects.size();
for (size_t i = 0; i < n; ++i)
if (!rects[i].isEmpty())
return true;
return false;
}
static bool isDeletableElement(const Node* node)
{
if (!node || !node->isHTMLElement() || !node->inDocument() || !node->isContentEditable())
return false;
// In general we want to only draw the UI arround object of a certain area, but we still keep the min width/height to
// make sure we don't end up with very thin or very short elements getting the UI.
const int minimumArea = 2500;
const int minimumWidth = 48;
const int minimumHeight = 16;
const unsigned minimumVisibleBorders = 1;
RenderObject* renderer = node->renderer();
if (!renderer || !renderer->isBox())
return false;
// Disallow the body element since it isn't practical to delete, and the deletion UI would be clipped.
if (node->hasTagName(bodyTag))
return false;
// Disallow elements with any overflow clip, since the deletion UI would be clipped as well. <rdar://problem/6840161>
if (renderer->hasOverflowClip())
return false;
// Disallow Mail blockquotes since the deletion UI would get in the way of editing for these.
if (isMailBlockquote(node))
return false;
RenderBox* box = toRenderBox(renderer);
IntRect borderBoundingBox = box->borderBoundingBox();
if (borderBoundingBox.width() < minimumWidth || borderBoundingBox.height() < minimumHeight)
return false;
if ((borderBoundingBox.width() * borderBoundingBox.height()) < minimumArea)
return false;
if (renderer->isTable())
return true;
if (node->hasTagName(ulTag) || node->hasTagName(olTag) || node->hasTagName(iframeTag))
return true;
if (renderer->isPositioned())
return true;
if (renderer->isRenderBlock() && !renderer->isTableCell()) {
RenderStyle* style = renderer->style();
if (!style)
return false;
// Allow blocks that have background images
if (style->hasBackgroundImage() && style->backgroundImage()->canRender(1.0f))
return true;
// Allow blocks with a minimum number of non-transparent borders
unsigned visibleBorders = style->borderTop().isVisible() + style->borderBottom().isVisible() + style->borderLeft().isVisible() + style->borderRight().isVisible();
if (visibleBorders >= minimumVisibleBorders)
return true;
// Allow blocks that have a different background from it's parent
Node* parentNode = node->parentNode();
if (!parentNode)
return false;
RenderObject* parentRenderer = parentNode->renderer();
if (!parentRenderer)
return false;
RenderStyle* parentStyle = parentRenderer->style();
if (!parentStyle)
return false;
if (style->hasBackground() && (!parentStyle->hasBackground() || style->backgroundColor() != parentStyle->backgroundColor()))
return true;
}
return false;
}