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Diffstat (limited to 'accessible/generic/ImageAccessible.cpp')
| -rw-r--r-- | accessible/generic/ImageAccessible.cpp | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/accessible/generic/ImageAccessible.cpp b/accessible/generic/ImageAccessible.cpp new file mode 100644 index 0000000000..df964e026c --- /dev/null +++ b/accessible/generic/ImageAccessible.cpp @@ -0,0 +1,260 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* 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 "ImageAccessible.h" + +#include "DocAccessible-inl.h" +#include "LocalAccessible-inl.h" +#include "nsAccUtils.h" +#include "mozilla/a11y/Role.h" +#include "AccAttributes.h" +#include "AccIterator.h" +#include "CacheConstants.h" +#include "States.h" + +#include "imgIRequest.h" +#include "nsGenericHTMLElement.h" +#include "mozilla/dom/BrowsingContext.h" +#include "mozilla/dom/Document.h" +#include "mozilla/dom/MutationEventBinding.h" +#include "nsContentUtils.h" +#include "nsIImageLoadingContent.h" +#include "nsPIDOMWindow.h" +#include "nsIURI.h" + +namespace mozilla::a11y { + +NS_IMPL_ISUPPORTS_INHERITED(ImageAccessible, LinkableAccessible, + imgINotificationObserver) + +//////////////////////////////////////////////////////////////////////////////// +// ImageAccessible +//////////////////////////////////////////////////////////////////////////////// + +ImageAccessible::ImageAccessible(nsIContent* aContent, DocAccessible* aDoc) + : LinkableAccessible(aContent, aDoc), + mImageRequestStatus(imgIRequest::STATUS_NONE) { + mType = eImageType; + nsCOMPtr<nsIImageLoadingContent> content(do_QueryInterface(mContent)); + if (content) { + content->AddNativeObserver(this); + nsCOMPtr<imgIRequest> imageRequest; + content->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST, + getter_AddRefs(imageRequest)); + if (imageRequest) { + imageRequest->GetImageStatus(&mImageRequestStatus); + } + } +} + +ImageAccessible::~ImageAccessible() {} + +//////////////////////////////////////////////////////////////////////////////// +// LocalAccessible public + +void ImageAccessible::Shutdown() { + nsCOMPtr<nsIImageLoadingContent> content(do_QueryInterface(mContent)); + if (content) { + content->RemoveNativeObserver(this); + } + + LinkableAccessible::Shutdown(); +} + +uint64_t ImageAccessible::NativeState() const { + // The state is a bitfield, get our inherited state, then logically OR it with + // states::ANIMATED if this is an animated image. + + uint64_t state = LinkableAccessible::NativeState(); + + if (mImageRequestStatus & imgIRequest::STATUS_IS_ANIMATED) { + state |= states::ANIMATED; + } + + if (!(mImageRequestStatus & imgIRequest::STATUS_SIZE_AVAILABLE)) { + nsIFrame* frame = GetFrame(); + MOZ_ASSERT(!frame || frame->AccessibleType() == eImageType || + frame->AccessibleType() == a11y::eHTMLImageMapType); + if (frame && !frame->HasAnyStateBits(IMAGE_SIZECONSTRAINED)) { + // The size of this image hasn't been constrained and we haven't loaded + // enough of the image to know its size yet. This means it currently + // has 0 width and height. + state |= states::INVISIBLE; + } + } + + return state; +} + +ENameValueFlag ImageAccessible::NativeName(nsString& aName) const { + mContent->AsElement()->GetAttr(nsGkAtoms::alt, aName); + if (!aName.IsEmpty()) return eNameOK; + + ENameValueFlag nameFlag = LocalAccessible::NativeName(aName); + if (!aName.IsEmpty()) return nameFlag; + + return eNameOK; +} + +role ImageAccessible::NativeRole() const { return roles::GRAPHIC; } + +void ImageAccessible::DOMAttributeChanged(int32_t aNameSpaceID, + nsAtom* aAttribute, int32_t aModType, + const nsAttrValue* aOldValue, + uint64_t aOldState) { + LinkableAccessible::DOMAttributeChanged(aNameSpaceID, aAttribute, aModType, + aOldValue, aOldState); + + if (aAttribute == nsGkAtoms::longdesc && + (aModType == dom::MutationEvent_Binding::ADDITION || + aModType == dom::MutationEvent_Binding::REMOVAL)) { + mDoc->QueueCacheUpdate(this, CacheDomain::Actions); + } +} + +//////////////////////////////////////////////////////////////////////////////// +// LocalAccessible + +uint8_t ImageAccessible::ActionCount() const { + uint8_t actionCount = LinkableAccessible::ActionCount(); + return HasLongDesc() ? actionCount + 1 : actionCount; +} + +void ImageAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName) { + aName.Truncate(); + if (IsLongDescIndex(aIndex) && HasLongDesc()) { + aName.AssignLiteral("showlongdesc"); + } else { + LinkableAccessible::ActionNameAt(aIndex, aName); + } +} + +bool ImageAccessible::DoAction(uint8_t aIndex) const { + // Get the long description uri and open in a new window. + if (!IsLongDescIndex(aIndex)) return LinkableAccessible::DoAction(aIndex); + + nsCOMPtr<nsIURI> uri = GetLongDescURI(); + if (!uri) return false; + + nsAutoCString utf8spec; + uri->GetSpec(utf8spec); + NS_ConvertUTF8toUTF16 spec(utf8spec); + + dom::Document* document = mContent->OwnerDoc(); + nsCOMPtr<nsPIDOMWindowOuter> piWindow = document->GetWindow(); + if (!piWindow) return false; + + RefPtr<dom::BrowsingContext> tmp; + return NS_SUCCEEDED(piWindow->Open(spec, u""_ns, u""_ns, + /* aLoadInfo = */ nullptr, + /* aForceNoOpener = */ false, + getter_AddRefs(tmp))); +} + +//////////////////////////////////////////////////////////////////////////////// +// ImageAccessible + +LayoutDeviceIntPoint ImageAccessible::Position(uint32_t aCoordType) { + LayoutDeviceIntPoint point = Bounds().TopLeft(); + nsAccUtils::ConvertScreenCoordsTo(&point.x.value, &point.y.value, aCoordType, + this); + return point; +} + +LayoutDeviceIntSize ImageAccessible::Size() { return Bounds().Size(); } + +// LocalAccessible +already_AddRefed<AccAttributes> ImageAccessible::NativeAttributes() { + RefPtr<AccAttributes> attributes = LinkableAccessible::NativeAttributes(); + + nsString src; + mContent->AsElement()->GetAttr(nsGkAtoms::src, src); + if (!src.IsEmpty()) attributes->SetAttribute(nsGkAtoms::src, std::move(src)); + + return attributes.forget(); +} + +//////////////////////////////////////////////////////////////////////////////// +// Private methods + +already_AddRefed<nsIURI> ImageAccessible::GetLongDescURI() const { + if (mContent->AsElement()->HasAttr(nsGkAtoms::longdesc)) { + // To check if longdesc contains an invalid url. + nsAutoString longdesc; + mContent->AsElement()->GetAttr(nsGkAtoms::longdesc, longdesc); + if (longdesc.FindChar(' ') != -1 || longdesc.FindChar('\t') != -1 || + longdesc.FindChar('\r') != -1 || longdesc.FindChar('\n') != -1) { + return nullptr; + } + nsCOMPtr<nsIURI> uri; + nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(uri), longdesc, + mContent->OwnerDoc(), + mContent->GetBaseURI()); + return uri.forget(); + } + + DocAccessible* document = Document(); + if (document) { + IDRefsIterator iter(document, mContent, nsGkAtoms::aria_describedby); + while (nsIContent* target = iter.NextElem()) { + if ((target->IsHTMLElement(nsGkAtoms::a) || + target->IsHTMLElement(nsGkAtoms::area)) && + target->AsElement()->HasAttr(nsGkAtoms::href)) { + nsGenericHTMLElement* element = nsGenericHTMLElement::FromNode(target); + + nsCOMPtr<nsIURI> uri; + element->GetURIAttr(nsGkAtoms::href, nullptr, getter_AddRefs(uri)); + return uri.forget(); + } + } + } + + return nullptr; +} + +bool ImageAccessible::IsLongDescIndex(uint8_t aIndex) const { + return aIndex == LinkableAccessible::ActionCount(); +} + +//////////////////////////////////////////////////////////////////////////////// +// imgINotificationObserver + +void ImageAccessible::Notify(imgIRequest* aRequest, int32_t aType, + const nsIntRect* aData) { + if (aType != imgINotificationObserver::FRAME_COMPLETE && + aType != imgINotificationObserver::LOAD_COMPLETE && + aType != imgINotificationObserver::DECODE_COMPLETE) { + // We should update our state if the whole image was decoded, + // or the first frame in the case of a gif. + return; + } + + if (IsDefunct() || !mParent) { + return; + } + + uint32_t status = imgIRequest::STATUS_NONE; + aRequest->GetImageStatus(&status); + + if ((status ^ mImageRequestStatus) & imgIRequest::STATUS_SIZE_AVAILABLE) { + nsIFrame* frame = GetFrame(); + if (frame && !frame->HasAnyStateBits(IMAGE_SIZECONSTRAINED)) { + RefPtr<AccEvent> event = new AccStateChangeEvent( + this, states::INVISIBLE, + !(status & imgIRequest::STATUS_SIZE_AVAILABLE)); + mDoc->FireDelayedEvent(event); + } + } + + if ((status ^ mImageRequestStatus) & imgIRequest::STATUS_IS_ANIMATED) { + RefPtr<AccEvent> event = new AccStateChangeEvent( + this, states::ANIMATED, (status & imgIRequest::STATUS_IS_ANIMATED)); + mDoc->FireDelayedEvent(event); + } + + mImageRequestStatus = status; +} + +} // namespace mozilla::a11y |