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Diffstat (limited to 'accessible/generic/ImageAccessible.cpp')
| -rw-r--r-- | accessible/generic/ImageAccessible.cpp | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/accessible/generic/ImageAccessible.cpp b/accessible/generic/ImageAccessible.cpp new file mode 100644 index 000000000..c6556b04d --- /dev/null +++ b/accessible/generic/ImageAccessible.cpp @@ -0,0 +1,224 @@ +/* -*- 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 "nsAccUtils.h" +#include "Role.h" +#include "AccIterator.h" +#include "States.h" + +#include "imgIContainer.h" +#include "imgIRequest.h" +#include "nsGenericHTMLElement.h" +#include "nsIDocument.h" +#include "nsIImageLoadingContent.h" +#include "nsIPresShell.h" +#include "nsIServiceManager.h" +#include "nsIDOMHTMLImageElement.h" +#include "nsIPersistentProperties2.h" +#include "nsPIDOMWindow.h" +#include "nsIURI.h" + +using namespace mozilla::a11y; + +//////////////////////////////////////////////////////////////////////////////// +// ImageAccessible +//////////////////////////////////////////////////////////////////////////////// + +ImageAccessible:: + ImageAccessible(nsIContent* aContent, DocAccessible* aDoc) : + LinkableAccessible(aContent, aDoc) +{ + mType = eImageType; +} + +ImageAccessible::~ImageAccessible() +{ +} + +//////////////////////////////////////////////////////////////////////////////// +// Accessible public + +uint64_t +ImageAccessible::NativeState() +{ + // 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(); + + nsCOMPtr<nsIImageLoadingContent> content(do_QueryInterface(mContent)); + nsCOMPtr<imgIRequest> imageRequest; + + if (content) + content->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST, + getter_AddRefs(imageRequest)); + + nsCOMPtr<imgIContainer> imgContainer; + if (imageRequest) + imageRequest->GetImage(getter_AddRefs(imgContainer)); + + if (imgContainer) { + bool animated; + imgContainer->GetAnimated(&animated); + if (animated) + state |= states::ANIMATED; + } + + return state; +} + +ENameValueFlag +ImageAccessible::NativeName(nsString& aName) +{ + bool hasAltAttrib = + mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::alt, aName); + if (!aName.IsEmpty()) + return eNameOK; + + ENameValueFlag nameFlag = Accessible::NativeName(aName); + if (!aName.IsEmpty()) + return nameFlag; + + // No accessible name but empty 'alt' attribute is present. If further name + // computation algorithm doesn't provide non empty name then it means + // an empty 'alt' attribute was used to indicate a decorative image (see + // Accessible::Name() method for details). + return hasAltAttrib ? eNoNameOnPurpose : eNameOK; +} + +role +ImageAccessible::NativeRole() +{ + return roles::GRAPHIC; +} + +//////////////////////////////////////////////////////////////////////////////// +// Accessible + +uint8_t +ImageAccessible::ActionCount() +{ + 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) +{ + // 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); + + nsIDocument* document = mContent->OwnerDoc(); + nsCOMPtr<nsPIDOMWindowOuter> piWindow = document->GetWindow(); + if (!piWindow) + return false; + + nsCOMPtr<nsPIDOMWindowOuter> tmp; + return NS_SUCCEEDED(piWindow->Open(spec, EmptyString(), EmptyString(), + /* aLoadInfo = */ nullptr, + /* aForceNoOpener = */ false, + getter_AddRefs(tmp))); +} + +//////////////////////////////////////////////////////////////////////////////// +// ImageAccessible + +nsIntPoint +ImageAccessible::Position(uint32_t aCoordType) +{ + nsIntRect rect = Bounds(); + nsAccUtils::ConvertScreenCoordsTo(&rect.x, &rect.y, aCoordType, this); + return rect.TopLeft(); +} + +nsIntSize +ImageAccessible::Size() +{ + return Bounds().Size(); +} + +// Accessible +already_AddRefed<nsIPersistentProperties> +ImageAccessible::NativeAttributes() +{ + nsCOMPtr<nsIPersistentProperties> attributes = + LinkableAccessible::NativeAttributes(); + + nsAutoString src; + mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::src, src); + if (!src.IsEmpty()) + nsAccUtils::SetAccAttr(attributes, nsGkAtoms::src, src); + + return attributes.forget(); +} + +//////////////////////////////////////////////////////////////////////////////// +// Private methods + +already_AddRefed<nsIURI> +ImageAccessible::GetLongDescURI() const +{ + if (mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::longdesc)) { + // To check if longdesc contains an invalid url. + nsAutoString longdesc; + mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::longdesc, longdesc); + if (longdesc.FindChar(' ') != -1 || longdesc.FindChar('\t') != -1 || + longdesc.FindChar('\r') != -1 || longdesc.FindChar('\n') != -1) { + return nullptr; + } + nsCOMPtr<nsIURI> baseURI = mContent->GetBaseURI(); + nsCOMPtr<nsIURI> uri; + nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(uri), longdesc, + mContent->OwnerDoc(), baseURI); + 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->HasAttr(kNameSpaceID_None, nsGkAtoms::href)) { + nsGenericHTMLElement* element = + nsGenericHTMLElement::FromContent(target); + + nsCOMPtr<nsIURI> uri; + element->GetURIAttr(nsGkAtoms::href, nullptr, getter_AddRefs(uri)); + return uri.forget(); + } + } + } + + return nullptr; +} + +bool +ImageAccessible::IsLongDescIndex(uint8_t aIndex) +{ + return aIndex == LinkableAccessible::ActionCount(); +} + |