1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/accessible/src/generic/ImageAccessible.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,228 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "ImageAccessible.h"
1.10 +
1.11 +#include "nsAccUtils.h"
1.12 +#include "Role.h"
1.13 +#include "AccIterator.h"
1.14 +#include "States.h"
1.15 +
1.16 +#include "imgIContainer.h"
1.17 +#include "imgIRequest.h"
1.18 +#include "nsGenericHTMLElement.h"
1.19 +#include "nsIDocument.h"
1.20 +#include "nsIImageLoadingContent.h"
1.21 +#include "nsIPresShell.h"
1.22 +#include "nsIServiceManager.h"
1.23 +#include "nsIDOMHTMLImageElement.h"
1.24 +#include "nsIPersistentProperties2.h"
1.25 +#include "nsPIDOMWindow.h"
1.26 +#include "nsIURI.h"
1.27 +
1.28 +using namespace mozilla::a11y;
1.29 +
1.30 +////////////////////////////////////////////////////////////////////////////////
1.31 +// ImageAccessible
1.32 +////////////////////////////////////////////////////////////////////////////////
1.33 +
1.34 +ImageAccessible::
1.35 + ImageAccessible(nsIContent* aContent, DocAccessible* aDoc) :
1.36 + LinkableAccessible(aContent, aDoc)
1.37 +{
1.38 + mType = eImageType;
1.39 +}
1.40 +
1.41 +NS_IMPL_ISUPPORTS_INHERITED(ImageAccessible, Accessible,
1.42 + nsIAccessibleImage)
1.43 +
1.44 +////////////////////////////////////////////////////////////////////////////////
1.45 +// Accessible public
1.46 +
1.47 +uint64_t
1.48 +ImageAccessible::NativeState()
1.49 +{
1.50 + // The state is a bitfield, get our inherited state, then logically OR it with
1.51 + // states::ANIMATED if this is an animated image.
1.52 +
1.53 + uint64_t state = LinkableAccessible::NativeState();
1.54 +
1.55 + nsCOMPtr<nsIImageLoadingContent> content(do_QueryInterface(mContent));
1.56 + nsCOMPtr<imgIRequest> imageRequest;
1.57 +
1.58 + if (content)
1.59 + content->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
1.60 + getter_AddRefs(imageRequest));
1.61 +
1.62 + nsCOMPtr<imgIContainer> imgContainer;
1.63 + if (imageRequest)
1.64 + imageRequest->GetImage(getter_AddRefs(imgContainer));
1.65 +
1.66 + if (imgContainer) {
1.67 + bool animated;
1.68 + imgContainer->GetAnimated(&animated);
1.69 + if (animated)
1.70 + state |= states::ANIMATED;
1.71 + }
1.72 +
1.73 + return state;
1.74 +}
1.75 +
1.76 +ENameValueFlag
1.77 +ImageAccessible::NativeName(nsString& aName)
1.78 +{
1.79 + bool hasAltAttrib =
1.80 + mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::alt, aName);
1.81 + if (!aName.IsEmpty())
1.82 + return eNameOK;
1.83 +
1.84 + ENameValueFlag nameFlag = Accessible::NativeName(aName);
1.85 + if (!aName.IsEmpty())
1.86 + return nameFlag;
1.87 +
1.88 + // No accessible name but empty 'alt' attribute is present. If further name
1.89 + // computation algorithm doesn't provide non empty name then it means
1.90 + // an empty 'alt' attribute was used to indicate a decorative image (see
1.91 + // Accessible::Name() method for details).
1.92 + return hasAltAttrib ? eNoNameOnPurpose : eNameOK;
1.93 +}
1.94 +
1.95 +role
1.96 +ImageAccessible::NativeRole()
1.97 +{
1.98 + return roles::GRAPHIC;
1.99 +}
1.100 +
1.101 +////////////////////////////////////////////////////////////////////////////////
1.102 +// nsIAccessible
1.103 +
1.104 +uint8_t
1.105 +ImageAccessible::ActionCount()
1.106 +{
1.107 + uint8_t actionCount = LinkableAccessible::ActionCount();
1.108 + return HasLongDesc() ? actionCount + 1 : actionCount;
1.109 +}
1.110 +
1.111 +NS_IMETHODIMP
1.112 +ImageAccessible::GetActionName(uint8_t aIndex, nsAString& aName)
1.113 +{
1.114 + aName.Truncate();
1.115 +
1.116 + if (IsDefunct())
1.117 + return NS_ERROR_FAILURE;
1.118 +
1.119 + if (IsLongDescIndex(aIndex) && HasLongDesc()) {
1.120 + aName.AssignLiteral("showlongdesc");
1.121 + return NS_OK;
1.122 + }
1.123 + return LinkableAccessible::GetActionName(aIndex, aName);
1.124 +}
1.125 +
1.126 +NS_IMETHODIMP
1.127 +ImageAccessible::DoAction(uint8_t aIndex)
1.128 +{
1.129 + if (IsDefunct())
1.130 + return NS_ERROR_FAILURE;
1.131 +
1.132 + // Get the long description uri and open in a new window.
1.133 + if (!IsLongDescIndex(aIndex))
1.134 + return LinkableAccessible::DoAction(aIndex);
1.135 +
1.136 + nsCOMPtr<nsIURI> uri = GetLongDescURI();
1.137 + if (!uri)
1.138 + return NS_ERROR_INVALID_ARG;
1.139 +
1.140 + nsAutoCString utf8spec;
1.141 + uri->GetSpec(utf8spec);
1.142 + NS_ConvertUTF8toUTF16 spec(utf8spec);
1.143 +
1.144 + nsIDocument* document = mContent->OwnerDoc();
1.145 + nsCOMPtr<nsPIDOMWindow> piWindow = document->GetWindow();
1.146 + nsCOMPtr<nsIDOMWindow> win = do_QueryInterface(piWindow);
1.147 + NS_ENSURE_STATE(win);
1.148 +
1.149 + nsCOMPtr<nsIDOMWindow> tmp;
1.150 + return win->Open(spec, EmptyString(), EmptyString(),
1.151 + getter_AddRefs(tmp));
1.152 +}
1.153 +
1.154 +////////////////////////////////////////////////////////////////////////////////
1.155 +// nsIAccessibleImage
1.156 +
1.157 +NS_IMETHODIMP
1.158 +ImageAccessible::GetImagePosition(uint32_t aCoordType, int32_t* aX, int32_t* aY)
1.159 +{
1.160 + int32_t width, height;
1.161 + nsresult rv = GetBounds(aX, aY, &width, &height);
1.162 + if (NS_FAILED(rv))
1.163 + return rv;
1.164 +
1.165 + nsAccUtils::ConvertScreenCoordsTo(aX, aY, aCoordType, this);
1.166 + return NS_OK;
1.167 +}
1.168 +
1.169 +NS_IMETHODIMP
1.170 +ImageAccessible::GetImageSize(int32_t* aWidth, int32_t* aHeight)
1.171 +{
1.172 + int32_t x, y;
1.173 + return GetBounds(&x, &y, aWidth, aHeight);
1.174 +}
1.175 +
1.176 +// Accessible
1.177 +already_AddRefed<nsIPersistentProperties>
1.178 +ImageAccessible::NativeAttributes()
1.179 +{
1.180 + nsCOMPtr<nsIPersistentProperties> attributes =
1.181 + LinkableAccessible::NativeAttributes();
1.182 +
1.183 + nsAutoString src;
1.184 + mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::src, src);
1.185 + if (!src.IsEmpty())
1.186 + nsAccUtils::SetAccAttr(attributes, nsGkAtoms::src, src);
1.187 +
1.188 + return attributes.forget();
1.189 +}
1.190 +
1.191 +////////////////////////////////////////////////////////////////////////////////
1.192 +// Private methods
1.193 +
1.194 +already_AddRefed<nsIURI>
1.195 +ImageAccessible::GetLongDescURI() const
1.196 +{
1.197 + if (mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::longdesc)) {
1.198 + nsGenericHTMLElement* element =
1.199 + nsGenericHTMLElement::FromContent(mContent);
1.200 + if (element) {
1.201 + nsCOMPtr<nsIURI> uri;
1.202 + element->GetURIAttr(nsGkAtoms::longdesc, nullptr, getter_AddRefs(uri));
1.203 + return uri.forget();
1.204 + }
1.205 + }
1.206 +
1.207 + DocAccessible* document = Document();
1.208 + if (document) {
1.209 + IDRefsIterator iter(document, mContent, nsGkAtoms::aria_describedby);
1.210 + while (nsIContent* target = iter.NextElem()) {
1.211 + if ((target->IsHTML(nsGkAtoms::a) || target->IsHTML(nsGkAtoms::area)) &&
1.212 + target->HasAttr(kNameSpaceID_None, nsGkAtoms::href)) {
1.213 + nsGenericHTMLElement* element =
1.214 + nsGenericHTMLElement::FromContent(target);
1.215 +
1.216 + nsCOMPtr<nsIURI> uri;
1.217 + element->GetURIAttr(nsGkAtoms::href, nullptr, getter_AddRefs(uri));
1.218 + return uri.forget();
1.219 + }
1.220 + }
1.221 + }
1.222 +
1.223 + return nullptr;
1.224 +}
1.225 +
1.226 +bool
1.227 +ImageAccessible::IsLongDescIndex(uint8_t aIndex)
1.228 +{
1.229 + return aIndex == LinkableAccessible::ActionCount();
1.230 +}
1.231 +
