The Tor Browser: accessible/src/html/HTMLLinkAccessible.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "HTMLLinkAccessible.h"

     8 #include "nsCoreUtils.h"

     9 #include "DocAccessible.h"

    10 #include "Role.h"

    11 #include "States.h"

    13 #include "nsContentUtils.h"

    14 #include "mozilla/EventStates.h"

    15 #include "mozilla/dom/Element.h"

    17 using namespace mozilla;

    18 using namespace mozilla::a11y;

    20 ////////////////////////////////////////////////////////////////////////////////

    21 // HTMLLinkAccessible

    22 ////////////////////////////////////////////////////////////////////////////////

    24 HTMLLinkAccessible::

    25   HTMLLinkAccessible(nsIContent* aContent, DocAccessible* aDoc) :

    26   HyperTextAccessibleWrap(aContent, aDoc)

    27 {

    28 }

    30 // Expose nsIAccessibleHyperLink unconditionally

    31 NS_IMPL_ISUPPORTS_INHERITED(HTMLLinkAccessible, HyperTextAccessibleWrap,

    32                             nsIAccessibleHyperLink)

    34 ////////////////////////////////////////////////////////////////////////////////

    35 // nsIAccessible

    37 role

    38 HTMLLinkAccessible::NativeRole()

    39 {

    40   return roles::LINK;

    41 }

    43 uint64_t

    44 HTMLLinkAccessible::NativeState()

    45 {

    46   return HyperTextAccessibleWrap::NativeState() & ~states::READONLY;

    47 }

    49 uint64_t

    50 HTMLLinkAccessible::NativeLinkState() const

    51 {

    52   EventStates eventState = mContent->AsElement()->State();

    53   if (eventState.HasState(NS_EVENT_STATE_UNVISITED))

    54     return states::LINKED;

    56   if (eventState.HasState(NS_EVENT_STATE_VISITED))

    57     return states::LINKED | states::TRAVERSED;

    59   // This is a either named anchor (a link with also a name attribute) or

    60   // it doesn't have any attributes. Check if 'click' event handler is

    61   // registered, otherwise bail out.

    62   return nsCoreUtils::HasClickListener(mContent) ? states::LINKED : 0;

    63 }

    65 uint64_t

    66 HTMLLinkAccessible::NativeInteractiveState() const

    67 {

    68   uint64_t state = HyperTextAccessibleWrap::NativeInteractiveState();

    70   // This is how we indicate it is a named anchor. In other words, this anchor

    71   // can be selected as a location :) There is no other better state to use to

    72   // indicate this.

    73   if (mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::name))

    74     state |= states::SELECTABLE;

    76   return state;

    77 }

    79 void

    80 HTMLLinkAccessible::Value(nsString& aValue)

    81 {

    82   aValue.Truncate();

    84   HyperTextAccessible::Value(aValue);

    85   if (aValue.IsEmpty())

    86     nsContentUtils::GetLinkLocation(mContent->AsElement(), aValue);

    87 }

    89 uint8_t

    90 HTMLLinkAccessible::ActionCount()

    91 {

    92   return IsLinked() ? 1 : HyperTextAccessible::ActionCount();

    93 }

    95 NS_IMETHODIMP

    96 HTMLLinkAccessible::GetActionName(uint8_t aIndex, nsAString& aName)

    97 {

    98   aName.Truncate();

   100   if (!IsLinked())

   101     return HyperTextAccessible::GetActionName(aIndex, aName);

   103   // Action 0 (default action): Jump to link

   104   if (aIndex != eAction_Jump)

   105     return NS_ERROR_INVALID_ARG;

   107   aName.AssignLiteral("jump");

   108   return NS_OK;

   109 }

   111 NS_IMETHODIMP

   112 HTMLLinkAccessible::DoAction(uint8_t aIndex)

   113 {

   114   if (!IsLinked())

   115     return HyperTextAccessible::DoAction(aIndex);

   117   // Action 0 (default action): Jump to link

   118   if (aIndex != eAction_Jump)

   119     return NS_ERROR_INVALID_ARG;

   121   if (IsDefunct())

   122     return NS_ERROR_FAILURE;

   124   DoCommand();

   125   return NS_OK;

   126 }

   128 ////////////////////////////////////////////////////////////////////////////////

   129 // HyperLinkAccessible

   131 bool

   132 HTMLLinkAccessible::IsLink()

   133 {

   134   // Expose HyperLinkAccessible unconditionally.

   135   return true;

   136 }

   138 already_AddRefed<nsIURI>

   139 HTMLLinkAccessible::AnchorURIAt(uint32_t aAnchorIndex)

   140 {

   141   return aAnchorIndex == 0 ? mContent->GetHrefURI() : nullptr;

   142 }

   144 ////////////////////////////////////////////////////////////////////////////////

   145 // Protected members

   147 bool

   148 HTMLLinkAccessible::IsLinked()

   149 {

   150   if (IsDefunct())

   151     return false;

   153   EventStates state = mContent->AsElement()->State();

   154   return state.HasAtLeastOneOfStates(NS_EVENT_STATE_VISITED |

   155                                      NS_EVENT_STATE_UNVISITED);

   156 }

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