gecko-dev/dom/base/DocumentOrShadowRoot.cpp

288 строки
8.7 KiB
C++
Исходник Обычный вид История

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "DocumentOrShadowRoot.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/dom/StyleSheetList.h"
#include "nsDocument.h"
#include "nsFocusManager.h"
#include "nsLayoutUtils.h"
#include "nsSVGUtils.h"
namespace mozilla {
namespace dom {
DocumentOrShadowRoot::DocumentOrShadowRoot(mozilla::dom::ShadowRoot& aShadowRoot)
: mAsNode(aShadowRoot)
, mKind(Kind::ShadowRoot)
{}
DocumentOrShadowRoot::DocumentOrShadowRoot(nsIDocument& aDoc)
: mAsNode(aDoc)
, mKind(Kind::Document)
{}
StyleSheetList&
DocumentOrShadowRoot::EnsureDOMStyleSheets()
{
if (!mDOMStyleSheets) {
mDOMStyleSheets = new StyleSheetList(*this);
}
return *mDOMStyleSheets;
}
Element*
DocumentOrShadowRoot::GetElementById(const nsAString& aElementId)
{
if (MOZ_UNLIKELY(aElementId.IsEmpty())) {
nsContentUtils::ReportEmptyGetElementByIdArg(AsNode().OwnerDoc());
return nullptr;
}
if (nsIdentifierMapEntry* entry = mIdentifierMap.GetEntry(aElementId)) {
if (Element* el = entry->GetIdElement()) {
return el;
}
}
return nullptr;
}
already_AddRefed<nsContentList>
DocumentOrShadowRoot::GetElementsByTagNameNS(const nsAString& aNamespaceURI,
const nsAString& aLocalName)
{
ErrorResult rv;
RefPtr<nsContentList> list =
GetElementsByTagNameNS(aNamespaceURI, aLocalName, rv);
if (rv.Failed()) {
return nullptr;
}
return list.forget();
}
already_AddRefed<nsContentList>
DocumentOrShadowRoot::GetElementsByTagNameNS(const nsAString& aNamespaceURI,
const nsAString& aLocalName,
mozilla::ErrorResult& aResult)
{
int32_t nameSpaceId = kNameSpaceID_Wildcard;
if (!aNamespaceURI.EqualsLiteral("*")) {
aResult =
nsContentUtils::NameSpaceManager()->RegisterNameSpace(aNamespaceURI,
nameSpaceId);
if (aResult.Failed()) {
return nullptr;
}
}
NS_ASSERTION(nameSpaceId != kNameSpaceID_Unknown, "Unexpected namespace ID!");
return NS_GetContentList(&AsNode(), nameSpaceId, aLocalName);
}
already_AddRefed<nsContentList>
DocumentOrShadowRoot::GetElementsByClassName(const nsAString& aClasses)
{
return nsContentUtils::GetElementsByClassName(&AsNode(), aClasses);
}
nsIContent*
DocumentOrShadowRoot::Retarget(nsIContent* aContent) const
{
for (nsIContent* cur = aContent;
cur;
cur = cur->GetContainingShadowHost()) {
if (cur->SubtreeRoot() == &AsNode()) {
return cur;
}
}
return nullptr;
}
Element*
DocumentOrShadowRoot::GetRetargetedFocusedElement()
{
if (nsCOMPtr<nsPIDOMWindowOuter> window = AsNode().OwnerDoc()->GetWindow()) {
nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
nsIContent* focusedContent =
nsFocusManager::GetFocusedDescendant(window,
nsFocusManager::eOnlyCurrentWindow,
getter_AddRefs(focusedWindow));
// be safe and make sure the element is from this document
if (focusedContent && focusedContent->OwnerDoc() == AsNode().OwnerDoc()) {
if (focusedContent->ChromeOnlyAccess()) {
focusedContent = focusedContent->FindFirstNonChromeOnlyAccessContent();
}
if (focusedContent) {
if (!nsDocument::IsShadowDOMEnabled(focusedContent)) {
return focusedContent->AsElement();
}
if (nsIContent* retarget = Retarget(focusedContent)) {
return retarget->AsElement();
}
}
}
}
return nullptr;
}
Element*
DocumentOrShadowRoot::GetPointerLockElement()
{
nsCOMPtr<Element> pointerLockedElement =
do_QueryReferent(EventStateManager::sPointerLockedElement);
if (!pointerLockedElement) {
return nullptr;
}
nsIContent* retargetedPointerLockedElement = Retarget(pointerLockedElement);
return
retargetedPointerLockedElement && retargetedPointerLockedElement->IsElement() ?
retargetedPointerLockedElement->AsElement() : nullptr;
}
Element*
DocumentOrShadowRoot::GetFullscreenElement()
{
if (!AsNode().IsInComposedDoc()) {
return nullptr;
}
Element* element = AsNode().OwnerDoc()->FullScreenStackTop();
NS_ASSERTION(!element ||
element->State().HasState(NS_EVENT_STATE_FULL_SCREEN),
"Fullscreen element should have fullscreen styles applied");
nsIContent* retargeted = Retarget(element);
if (retargeted && retargeted->IsElement()) {
return retargeted->AsElement();
}
return nullptr;
}
Element*
DocumentOrShadowRoot::ElementFromPoint(float aX, float aY)
{
return ElementFromPointHelper(aX, aY, false, true);
}
void
DocumentOrShadowRoot::ElementsFromPoint(float aX, float aY,
nsTArray<RefPtr<Element>>& aElements)
{
ElementsFromPointHelper(aX, aY, nsIDocument::FLUSH_LAYOUT, aElements);
}
Element*
DocumentOrShadowRoot::ElementFromPointHelper(float aX, float aY,
bool aIgnoreRootScrollFrame,
bool aFlushLayout)
{
AutoTArray<RefPtr<Element>, 1> elementArray;
ElementsFromPointHelper(aX, aY,
((aIgnoreRootScrollFrame ? nsIDocument::IGNORE_ROOT_SCROLL_FRAME : 0) |
(aFlushLayout ? nsIDocument::FLUSH_LAYOUT : 0) |
nsIDocument::IS_ELEMENT_FROM_POINT),
elementArray);
if (elementArray.IsEmpty()) {
return nullptr;
}
return elementArray[0];
}
void
DocumentOrShadowRoot::ElementsFromPointHelper(float aX, float aY,
uint32_t aFlags,
nsTArray<RefPtr<mozilla::dom::Element>>& aElements)
{
// As per the the spec, we return null if either coord is negative
if (!(aFlags & nsIDocument::IGNORE_ROOT_SCROLL_FRAME) && (aX < 0 || aY < 0)) {
return;
}
nscoord x = nsPresContext::CSSPixelsToAppUnits(aX);
nscoord y = nsPresContext::CSSPixelsToAppUnits(aY);
nsPoint pt(x, y);
nsCOMPtr<nsIDocument> doc = AsNode().OwnerDoc();
// Make sure the layout information we get is up-to-date, and
// ensure we get a root frame (for everything but XUL)
if (aFlags & nsIDocument::FLUSH_LAYOUT) {
doc->FlushPendingNotifications(FlushType::Layout);
}
nsIPresShell* ps = doc->GetShell();
if (!ps) {
return;
}
nsIFrame* rootFrame = ps->GetRootFrame();
// XUL docs, unlike HTML, have no frame tree until everything's done loading
if (!rootFrame) {
return; // return null to premature XUL callers as a reminder to wait
}
nsTArray<nsIFrame*> outFrames;
// Emulate what GetFrameAtPoint does, since we want all the frames under our
// point.
nsLayoutUtils::GetFramesForArea(rootFrame, nsRect(pt, nsSize(1, 1)), outFrames,
nsLayoutUtils::IGNORE_PAINT_SUPPRESSION | nsLayoutUtils::IGNORE_CROSS_DOC |
((aFlags & nsIDocument::IGNORE_ROOT_SCROLL_FRAME) ? nsLayoutUtils::IGNORE_ROOT_SCROLL_FRAME : 0));
// Dunno when this would ever happen, as we should at least have a root frame under us?
if (outFrames.IsEmpty()) {
return;
}
// Used to filter out repeated elements in sequence.
nsIContent* lastAdded = nullptr;
for (uint32_t i = 0; i < outFrames.Length(); i++) {
nsIContent* node = doc->GetContentInThisDocument(outFrames[i]);
if (!node || !node->IsElement()) {
// If this helper is called via ElementsFromPoint, we need to make sure
// our frame is an element. Otherwise return whatever the top frame is
// even if it isn't the top-painted element.
// SVG 'text' element's SVGTextFrame doesn't respond to hit-testing, so
// if 'node' is a child of such an element then we need to manually defer
// to the parent here.
if (!(aFlags & nsIDocument::IS_ELEMENT_FROM_POINT) &&
!nsSVGUtils::IsInSVGTextSubtree(outFrames[i])) {
continue;
}
node = node->GetParent();
if (ShadowRoot* shadow = ShadowRoot::FromNodeOrNull(node)) {
node = shadow->Host();
}
}
//XXXsmaug There is plenty of unspec'ed behavior here
// https://github.com/w3c/webcomponents/issues/735
// https://github.com/w3c/webcomponents/issues/736
node = Retarget(node);
if (node && node != lastAdded) {
aElements.AppendElement(node->AsElement());
lastAdded = node;
// If this helper is called via ElementFromPoint, just return the first
// element we find.
if (aFlags & nsIDocument::IS_ELEMENT_FROM_POINT) {
return;
}
}
}
}
}
}