void
HTMLImageElement::UpdateResponsiveSource()
{
if (!IsSrcsetEnabled()) {
mResponsiveSelector = nullptr;
return;
}
nsIContent *currentSource =
mResponsiveSelector ? mResponsiveSelector->Content() : nullptr;
bool pictureEnabled = HTMLPictureElement::IsPictureEnabled();
nsINode *parent = pictureEnabled ? this->nsINode::GetParentNode() : nullptr;
nsINode *candidateSource = nullptr;
if (parent && parent->Tag() == nsGkAtoms::picture) {
// Walk source nodes previous to ourselves
candidateSource = parent->GetFirstChild();
} else {
candidateSource = this;
}
while (candidateSource) {
if (candidateSource == currentSource) {
// found no better source before current, re-run selection on
// that and keep it if it's still usable.
mResponsiveSelector->SelectImage(true);
if (mResponsiveSelector->NumCandidates()) {
break;
}
// no longer valid
mResponsiveSelector = nullptr;
if (candidateSource == this) {
// No further possibilities
break;
}
} else if (candidateSource == this) {
// We are the last possible source
if (!TryCreateResponsiveSelector(candidateSource->AsContent())) {
// Failed to find any source
mResponsiveSelector = nullptr;
}
break;
} else if (candidateSource->Tag() == nsGkAtoms::source &&
TryCreateResponsiveSelector(candidateSource->AsContent())) {
// This led to a valid source, stop
break;
}
candidateSource = candidateSource->GetNextSibling();
}
if (!candidateSource) {
// Ran out of siblings without finding ourself, e.g. XBL magic.
mResponsiveSelector = nullptr;
}
}
bool
HTMLImageElement::UpdateResponsiveSource()
{
bool hadSelector = !!mResponsiveSelector;
if (!IsSrcsetEnabled()) {
mResponsiveSelector = nullptr;
return hadSelector;
}
nsIContent *currentSource =
mResponsiveSelector ? mResponsiveSelector->Content() : nullptr;
bool pictureEnabled = HTMLPictureElement::IsPictureEnabled();
Element *parent = pictureEnabled ? nsINode::GetParentElement() : nullptr;
nsINode *candidateSource = nullptr;
if (parent && parent->IsHTMLElement(nsGkAtoms::picture)) {
// Walk source nodes previous to ourselves
candidateSource = parent->GetFirstChild();
} else {
candidateSource = this;
}
while (candidateSource) {
if (candidateSource == currentSource) {
// found no better source before current, re-run selection on
// that and keep it if it's still usable.
bool changed = mResponsiveSelector->SelectImage(true);
if (mResponsiveSelector->NumCandidates()) {
bool isUsableCandidate = true;
// an otherwise-usable source element may still have a media query that may not
// match any more.
if (candidateSource->IsHTMLElement(nsGkAtoms::source) &&
!SourceElementMatches(candidateSource->AsContent())) {
isUsableCandidate = false;
}
if (isUsableCandidate) {
return changed;
}
}
// no longer valid
mResponsiveSelector = nullptr;
if (candidateSource == this) {
// No further possibilities
break;
}
} else if (candidateSource == this) {
// We are the last possible source
if (!TryCreateResponsiveSelector(candidateSource->AsContent())) {
// Failed to find any source
mResponsiveSelector = nullptr;
}
break;
} else if (candidateSource->IsHTMLElement(nsGkAtoms::source) &&
TryCreateResponsiveSelector(candidateSource->AsContent())) {
// This led to a valid source, stop
break;
}
candidateSource = candidateSource->GetNextSibling();
}
if (!candidateSource) {
// Ran out of siblings without finding ourself, e.g. XBL magic.
mResponsiveSelector = nullptr;
}
return !hadSelector || mResponsiveSelector;
}
