forked from mirrors/gecko-dev
4e978b56b5
Gijs for front-end bits, layout for the new CSS properties and the removal of nsDeckFrame / nsStackLayout, Jamie and Morgan for the a11y changes. As discussed in the bug, the main tricky part here is handling a11y correctly. For <deck>, that's trivial (just use `visibility: hidden` to hide the panels visually, while removing the unselected panels from the a11y tree). For <tabpanels> however we need to do something special. We do want to hide stuff visually, but we want to preserve the contents in the a11y tree. For that, the easiest fix is introducing a new privileged CSS property (-moz-subtree-hidden-only-visually), which takes care of not painting the frame, but marks stuff offscreen in the accessibility tree. This is not intended to be a property used widely. Other than that, the changes are relatively straight-forward, though some of the accessible/mac changes I could get a sanity-check on. Differential Revision: https://phabricator.services.mozilla.com/D157875
140 lines
4.9 KiB
C++
140 lines
4.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/PresShell.h"
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#include "mozilla/dom/Document.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/dom/FromParser.h"
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#include "mozilla/dom/NodeInfo.h"
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#include "nsHTMLParts.h"
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#include "nsContainerFrame.h"
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#include "nsCSSRendering.h"
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#include "nsPageFrame.h"
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#include "nsStyleConsts.h"
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#include "nsGkAtoms.h"
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#include "nsBoxFrame.h"
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#include "nsIAnonymousContentCreator.h"
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#include "nsNodeInfoManager.h"
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#include "nsContentCreatorFunctions.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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class nsDocElementBoxFrame final : public nsBoxFrame,
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public nsIAnonymousContentCreator {
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public:
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virtual void DestroyFrom(nsIFrame* aDestructRoot,
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PostDestroyData& aPostDestroyData) override;
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friend nsIFrame* NS_NewBoxFrame(mozilla::PresShell* aPresShell,
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ComputedStyle* aStyle);
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explicit nsDocElementBoxFrame(ComputedStyle* aStyle,
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nsPresContext* aPresContext)
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: nsBoxFrame(aStyle, aPresContext, kClassID, true) {}
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NS_DECL_QUERYFRAME
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NS_DECL_FRAMEARENA_HELPERS(nsDocElementBoxFrame)
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// nsIAnonymousContentCreator
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virtual nsresult CreateAnonymousContent(
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nsTArray<ContentInfo>& aElements) override;
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virtual void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
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uint32_t aFilter) override;
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virtual bool IsFrameOfType(uint32_t aFlags) const override {
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// Override nsBoxFrame.
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if (aFlags & (nsIFrame::eReplacedContainsBlock | nsIFrame::eReplaced))
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return false;
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return nsBoxFrame::IsFrameOfType(aFlags);
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}
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#ifdef DEBUG_FRAME_DUMP
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virtual nsresult GetFrameName(nsAString& aResult) const override;
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#endif
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private:
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nsCOMPtr<Element> mPopupgroupContent;
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nsCOMPtr<Element> mTooltipContent;
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};
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//----------------------------------------------------------------------
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nsContainerFrame* NS_NewDocElementBoxFrame(PresShell* aPresShell,
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ComputedStyle* aStyle) {
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return new (aPresShell)
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nsDocElementBoxFrame(aStyle, aPresShell->GetPresContext());
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsDocElementBoxFrame)
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void nsDocElementBoxFrame::DestroyFrom(nsIFrame* aDestructRoot,
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PostDestroyData& aPostDestroyData) {
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aPostDestroyData.AddAnonymousContent(mPopupgroupContent.forget());
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aPostDestroyData.AddAnonymousContent(mTooltipContent.forget());
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nsBoxFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
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}
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nsresult nsDocElementBoxFrame::CreateAnonymousContent(
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nsTArray<ContentInfo>& aElements) {
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Document* doc = mContent->GetComposedDoc();
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if (!doc) {
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// The page is currently being torn down. Why bother.
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return NS_ERROR_FAILURE;
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}
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nsNodeInfoManager* nodeInfoManager = doc->NodeInfoManager();
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// create the top-secret popupgroup node. shhhhh!
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RefPtr<NodeInfo> nodeInfo;
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nodeInfo = nodeInfoManager->GetNodeInfo(
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nsGkAtoms::popupgroup, nullptr, kNameSpaceID_XUL, nsINode::ELEMENT_NODE);
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NS_ENSURE_TRUE(nodeInfo, NS_ERROR_OUT_OF_MEMORY);
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nsresult rv = NS_NewXULElement(getter_AddRefs(mPopupgroupContent),
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nodeInfo.forget(), dom::NOT_FROM_PARSER);
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NS_ENSURE_SUCCESS(rv, rv);
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// XXX(Bug 1631371) Check if this should use a fallible operation as it
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// pretended earlier.
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aElements.AppendElement(mPopupgroupContent);
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// create the top-secret default tooltip node. shhhhh!
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nodeInfo = nodeInfoManager->GetNodeInfo(
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nsGkAtoms::tooltip, nullptr, kNameSpaceID_XUL, nsINode::ELEMENT_NODE);
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NS_ENSURE_TRUE(nodeInfo, NS_ERROR_OUT_OF_MEMORY);
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rv = NS_NewXULElement(getter_AddRefs(mTooltipContent), nodeInfo.forget(),
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dom::NOT_FROM_PARSER);
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NS_ENSURE_SUCCESS(rv, rv);
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mTooltipContent->SetAttr(kNameSpaceID_None, nsGkAtoms::_default, u"true"_ns,
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false);
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// XXX(Bug 1631371) Check if this should use a fallible operation as it
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// pretended earlier.
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aElements.AppendElement(mTooltipContent);
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return NS_OK;
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}
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void nsDocElementBoxFrame::AppendAnonymousContentTo(
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nsTArray<nsIContent*>& aElements, uint32_t aFilter) {
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if (mPopupgroupContent) {
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aElements.AppendElement(mPopupgroupContent);
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}
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if (mTooltipContent) {
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aElements.AppendElement(mTooltipContent);
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}
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}
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NS_QUERYFRAME_HEAD(nsDocElementBoxFrame)
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NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
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NS_QUERYFRAME_TAIL_INHERITING(nsBoxFrame)
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#ifdef DEBUG_FRAME_DUMP
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nsresult nsDocElementBoxFrame::GetFrameName(nsAString& aResult) const {
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return MakeFrameName(u"DocElementBox"_ns, aResult);
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}
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#endif
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