static bool isDeletableElement(const Node* node) { if (!node || !node->isHTMLElement() || !node->inDocument() || !node->rendererIsEditable()) return false; // In general we want to only draw the UI around 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->isOutOfFlowPositioned()) return true; if (renderer->isRenderBlock() && !renderer->isTableCell()) { RenderStyle* style = renderer->style(); if (!style) return false; // Allow blocks that have background images if (style->hasBackgroundImage()) { for (const FillLayer* background = style->backgroundLayers(); background; background = background->next()) { if (background->image() && background->image()->canRender(renderer, 1)) 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 ContainerNode* parentNode = node->parentNode(); if (!parentNode) return false; RenderObject* parentRenderer = parentNode->renderer(); if (!parentRenderer) return false; RenderStyle* parentStyle = parentRenderer->style(); if (!parentStyle) return false; if (renderer->hasBackground() && (!parentRenderer->hasBackground() || style->visitedDependentColor(CSSPropertyBackgroundColor) != parentStyle->visitedDependentColor(CSSPropertyBackgroundColor))) return true; } return false; }