michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "HTMLLinkAccessible.h"
michael@0: 
michael@0: #include "nsCoreUtils.h"
michael@0: #include "DocAccessible.h"
michael@0: #include "Role.h"
michael@0: #include "States.h"
michael@0: 
michael@0: #include "nsContentUtils.h"
michael@0: #include "mozilla/EventStates.h"
michael@0: #include "mozilla/dom/Element.h"
michael@0: 
michael@0: using namespace mozilla;
michael@0: using namespace mozilla::a11y;
michael@0: 
michael@0: ////////////////////////////////////////////////////////////////////////////////
michael@0: // HTMLLinkAccessible
michael@0: ////////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: HTMLLinkAccessible::
michael@0:   HTMLLinkAccessible(nsIContent* aContent, DocAccessible* aDoc) :
michael@0:   HyperTextAccessibleWrap(aContent, aDoc)
michael@0: {
michael@0: }
michael@0: 
michael@0: // Expose nsIAccessibleHyperLink unconditionally
michael@0: NS_IMPL_ISUPPORTS_INHERITED(HTMLLinkAccessible, HyperTextAccessibleWrap,
michael@0:                             nsIAccessibleHyperLink)
michael@0: 
michael@0: ////////////////////////////////////////////////////////////////////////////////
michael@0: // nsIAccessible
michael@0: 
michael@0: role
michael@0: HTMLLinkAccessible::NativeRole()
michael@0: {
michael@0:   return roles::LINK;
michael@0: }
michael@0: 
michael@0: uint64_t
michael@0: HTMLLinkAccessible::NativeState()
michael@0: {
michael@0:   return HyperTextAccessibleWrap::NativeState() & ~states::READONLY;
michael@0: }
michael@0: 
michael@0: uint64_t
michael@0: HTMLLinkAccessible::NativeLinkState() const
michael@0: {
michael@0:   EventStates eventState = mContent->AsElement()->State();
michael@0:   if (eventState.HasState(NS_EVENT_STATE_UNVISITED))
michael@0:     return states::LINKED;
michael@0: 
michael@0:   if (eventState.HasState(NS_EVENT_STATE_VISITED))
michael@0:     return states::LINKED | states::TRAVERSED;
michael@0: 
michael@0:   // This is a either named anchor (a link with also a name attribute) or
michael@0:   // it doesn't have any attributes. Check if 'click' event handler is
michael@0:   // registered, otherwise bail out.
michael@0:   return nsCoreUtils::HasClickListener(mContent) ? states::LINKED : 0;
michael@0: }
michael@0: 
michael@0: uint64_t
michael@0: HTMLLinkAccessible::NativeInteractiveState() const
michael@0: {
michael@0:   uint64_t state = HyperTextAccessibleWrap::NativeInteractiveState();
michael@0: 
michael@0:   // This is how we indicate it is a named anchor. In other words, this anchor
michael@0:   // can be selected as a location :) There is no other better state to use to
michael@0:   // indicate this.
michael@0:   if (mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::name))
michael@0:     state |= states::SELECTABLE;
michael@0: 
michael@0:   return state;
michael@0: }
michael@0: 
michael@0: void
michael@0: HTMLLinkAccessible::Value(nsString& aValue)
michael@0: {
michael@0:   aValue.Truncate();
michael@0: 
michael@0:   HyperTextAccessible::Value(aValue);
michael@0:   if (aValue.IsEmpty())
michael@0:     nsContentUtils::GetLinkLocation(mContent->AsElement(), aValue);
michael@0: }
michael@0: 
michael@0: uint8_t
michael@0: HTMLLinkAccessible::ActionCount()
michael@0: {
michael@0:   return IsLinked() ? 1 : HyperTextAccessible::ActionCount();
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: HTMLLinkAccessible::GetActionName(uint8_t aIndex, nsAString& aName)
michael@0: {
michael@0:   aName.Truncate();
michael@0: 
michael@0:   if (!IsLinked())
michael@0:     return HyperTextAccessible::GetActionName(aIndex, aName);
michael@0: 
michael@0:   // Action 0 (default action): Jump to link
michael@0:   if (aIndex != eAction_Jump)
michael@0:     return NS_ERROR_INVALID_ARG;
michael@0: 
michael@0:   aName.AssignLiteral("jump");
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: HTMLLinkAccessible::DoAction(uint8_t aIndex)
michael@0: {
michael@0:   if (!IsLinked())
michael@0:     return HyperTextAccessible::DoAction(aIndex);
michael@0: 
michael@0:   // Action 0 (default action): Jump to link
michael@0:   if (aIndex != eAction_Jump)
michael@0:     return NS_ERROR_INVALID_ARG;
michael@0: 
michael@0:   if (IsDefunct())
michael@0:     return NS_ERROR_FAILURE;
michael@0: 
michael@0:   DoCommand();
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: ////////////////////////////////////////////////////////////////////////////////
michael@0: // HyperLinkAccessible
michael@0: 
michael@0: bool
michael@0: HTMLLinkAccessible::IsLink()
michael@0: {
michael@0:   // Expose HyperLinkAccessible unconditionally.
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: already_AddRefed<nsIURI>
michael@0: HTMLLinkAccessible::AnchorURIAt(uint32_t aAnchorIndex)
michael@0: {
michael@0:   return aAnchorIndex == 0 ? mContent->GetHrefURI() : nullptr;
michael@0: }
michael@0: 
michael@0: ////////////////////////////////////////////////////////////////////////////////
michael@0: // Protected members
michael@0: 
michael@0: bool
michael@0: HTMLLinkAccessible::IsLinked()
michael@0: {
michael@0:   if (IsDefunct())
michael@0:     return false;
michael@0: 
michael@0:   EventStates state = mContent->AsElement()->State();
michael@0:   return state.HasAtLeastOneOfStates(NS_EVENT_STATE_VISITED |
michael@0:                                      NS_EVENT_STATE_UNVISITED);
michael@0: }