// 'region' is in contents coordinates relative to the frame containing 'node'
// 'remainingFingerRegion' and 'intersectingRegions' will always be in main frame contents
// coordinates.
// Thus, before comparing, we need to map the former to main frame contents coordinates.
bool FatFingers::checkFingerIntersection(const Platform::IntRectRegion& region,
const Platform::IntRectRegion& remainingFingerRegion,
Node* node, Vector<IntersectingRegion>& intersectingRegions)
{
ASSERT(node);
Platform::IntRectRegion regionCopy(region);
WebCore::IntPoint framePos(m_webPage->frameOffset(node->document()->frame()));
regionCopy.move(framePos.x(), framePos.y());
Platform::IntRectRegion intersection = intersectRegions(regionCopy, remainingFingerRegion);
if (intersection.isEmpty())
return false;
#if DEBUG_FAT_FINGERS
String nodeName;
if (node->isTextNode())
nodeName = "text node";
else if (node->isElementNode())
nodeName = String::format("%s node", toElement(node)->tagName().latin1().data());
else
nodeName = "unknown node";
log(LogLevelInfo, "%s has region %s, intersecting at %s (area %d)", nodeName.latin1().data(),
regionCopy.toString().c_str(), intersection.toString().c_str(), intersection.area());
#endif
intersectingRegions.append(std::make_pair(node, intersection));
return true;
}
bool FatFingers::checkForClickableElement(Element* curElement,
Vector<IntersectingRegion>& intersectingRegions,
IntRectRegion& remainingFingerRegion,
RenderLayer*& lowestPositionedEnclosingLayerSoFar)
{
ASSERT(curElement);
bool intersects = false;
IntRectRegion elementRegion;
bool isClickableElement = isElementClickable(curElement);
if (isClickableElement) {
if (curElement->isLink()) {
// Links can wrap lines, and in such cases Node::boundingBox() can give us
// not accurate rects, since it unites all InlineBox's rects. In these
// cases, we can process each line of the link separately with our
// intersection rect, getting a more accurate clicking.
Vector<FloatQuad> quads;
curElement->renderer()->absoluteFocusRingQuads(quads);
size_t n = quads.size();
ASSERT(n);
for (size_t i = 0; i < n; ++i)
elementRegion = unionRegions(elementRegion, Platform::IntRect(quads[i].enclosingBoundingBox()));
} else
elementRegion = IntRectRegion(curElement->renderer()->absoluteBoundingBoxRect(true /*use transforms*/));
} else
elementRegion = IntRectRegion(curElement->renderer()->absoluteBoundingBoxRect(true /*use transforms*/));
if (lowestPositionedEnclosingLayerSoFar) {
RenderLayer* curElementRenderLayer = m_webPage->enclosingPositionedAncestorOrSelfIfPositioned(curElement->renderer()->enclosingLayer());
if (curElementRenderLayer != lowestPositionedEnclosingLayerSoFar) {
// elementRegion will always be in contents coordinates of its container frame. It needs to be
// mapped to main frame contents coordinates in order to intersect the fingerRegion, then.
WebCore::IntPoint framePos(m_webPage->frameOffset(curElement->document()->frame()));
IntRectRegion layerRegion(Platform::IntRect(lowestPositionedEnclosingLayerSoFar->renderer()->absoluteBoundingBoxRect(true/*use transforms*/)));
layerRegion.move(framePos.x(), framePos.y());
remainingFingerRegion = intersectRegions(remainingFingerRegion, layerRegion);
lowestPositionedEnclosingLayerSoFar = curElementRenderLayer;
}
} else
lowestPositionedEnclosingLayerSoFar = m_webPage->enclosingPositionedAncestorOrSelfIfPositioned(curElement->renderer()->enclosingLayer());
if (isClickableElement)
intersects = checkFingerIntersection(elementRegion, remainingFingerRegion, curElement, intersectingRegions);
return intersects;
}