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comparison: accessible/src/html/HTMLLinkAccessible.cpp
accessible/src/html/HTMLLinkAccessible.cpp
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| 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/. */ | |
| 5 | |
| 6 #include "HTMLLinkAccessible.h" | |
| 7 | |
| 8 #include "nsCoreUtils.h" | |
| 9 #include "DocAccessible.h" | |
| 10 #include "Role.h" | |
| 11 #include "States.h" | |
| 12 | |
| 13 #include "nsContentUtils.h" | |
| 14 #include "mozilla/EventStates.h" | |
| 15 #include "mozilla/dom/Element.h" | |
| 16 | |
| 17 using namespace mozilla; | |
| 18 using namespace mozilla::a11y; | |
| 19 | |
| 20 //////////////////////////////////////////////////////////////////////////////// | |
| 21 // HTMLLinkAccessible | |
| 22 //////////////////////////////////////////////////////////////////////////////// | |
| 23 | |
| 24 HTMLLinkAccessible:: | |
| 25 HTMLLinkAccessible(nsIContent* aContent, DocAccessible* aDoc) : | |
| 26 HyperTextAccessibleWrap(aContent, aDoc) | |
| 27 { | |
| 28 } | |
| 29 | |
| 30 // Expose nsIAccessibleHyperLink unconditionally | |
| 31 NS_IMPL_ISUPPORTS_INHERITED(HTMLLinkAccessible, HyperTextAccessibleWrap, | |
| 32 nsIAccessibleHyperLink) | |
| 33 | |
| 34 //////////////////////////////////////////////////////////////////////////////// | |
| 35 // nsIAccessible | |
| 36 | |
| 37 role | |
| 38 HTMLLinkAccessible::NativeRole() | |
| 39 { | |
| 40 return roles::LINK; | |
| 41 } | |
| 42 | |
| 43 uint64_t | |
| 44 HTMLLinkAccessible::NativeState() | |
| 45 { | |
| 46 return HyperTextAccessibleWrap::NativeState() & ~states::READONLY; | |
| 47 } | |
| 48 | |
| 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; | |
| 55 | |
| 56 if (eventState.HasState(NS_EVENT_STATE_VISITED)) | |
| 57 return states::LINKED | states::TRAVERSED; | |
| 58 | |
| 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 } | |
| 64 | |
| 65 uint64_t | |
| 66 HTMLLinkAccessible::NativeInteractiveState() const | |
| 67 { | |
| 68 uint64_t state = HyperTextAccessibleWrap::NativeInteractiveState(); | |
| 69 | |
| 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; | |
| 75 | |
| 76 return state; | |
| 77 } | |
| 78 | |
| 79 void | |
| 80 HTMLLinkAccessible::Value(nsString& aValue) | |
| 81 { | |
| 82 aValue.Truncate(); | |
| 83 | |
| 84 HyperTextAccessible::Value(aValue); | |
| 85 if (aValue.IsEmpty()) | |
| 86 nsContentUtils::GetLinkLocation(mContent->AsElement(), aValue); | |
| 87 } | |
| 88 | |
| 89 uint8_t | |
| 90 HTMLLinkAccessible::ActionCount() | |
| 91 { | |
| 92 return IsLinked() ? 1 : HyperTextAccessible::ActionCount(); | |
| 93 } | |
| 94 | |
| 95 NS_IMETHODIMP | |
| 96 HTMLLinkAccessible::GetActionName(uint8_t aIndex, nsAString& aName) | |
| 97 { | |
| 98 aName.Truncate(); | |
| 99 | |
| 100 if (!IsLinked()) | |
| 101 return HyperTextAccessible::GetActionName(aIndex, aName); | |
| 102 | |
| 103 // Action 0 (default action): Jump to link | |
| 104 if (aIndex != eAction_Jump) | |
| 105 return NS_ERROR_INVALID_ARG; | |
| 106 | |
| 107 aName.AssignLiteral("jump"); | |
| 108 return NS_OK; | |
| 109 } | |
| 110 | |
| 111 NS_IMETHODIMP | |
| 112 HTMLLinkAccessible::DoAction(uint8_t aIndex) | |
| 113 { | |
| 114 if (!IsLinked()) | |
| 115 return HyperTextAccessible::DoAction(aIndex); | |
| 116 | |
| 117 // Action 0 (default action): Jump to link | |
| 118 if (aIndex != eAction_Jump) | |
| 119 return NS_ERROR_INVALID_ARG; | |
| 120 | |
| 121 if (IsDefunct()) | |
| 122 return NS_ERROR_FAILURE; | |
| 123 | |
| 124 DoCommand(); | |
| 125 return NS_OK; | |
| 126 } | |
| 127 | |
| 128 //////////////////////////////////////////////////////////////////////////////// | |
| 129 // HyperLinkAccessible | |
| 130 | |
| 131 bool | |
| 132 HTMLLinkAccessible::IsLink() | |
| 133 { | |
| 134 // Expose HyperLinkAccessible unconditionally. | |
| 135 return true; | |
| 136 } | |
| 137 | |
| 138 already_AddRefed<nsIURI> | |
| 139 HTMLLinkAccessible::AnchorURIAt(uint32_t aAnchorIndex) | |
| 140 { | |
| 141 return aAnchorIndex == 0 ? mContent->GetHrefURI() : nullptr; | |
| 142 } | |
| 143 | |
| 144 //////////////////////////////////////////////////////////////////////////////// | |
| 145 // Protected members | |
| 146 | |
| 147 bool | |
| 148 HTMLLinkAccessible::IsLinked() | |
| 149 { | |
| 150 if (IsDefunct()) | |
| 151 return false; | |
| 152 | |
| 153 EventStates state = mContent->AsElement()->State(); | |
| 154 return state.HasAtLeastOneOfStates(NS_EVENT_STATE_VISITED | | |
| 155 NS_EVENT_STATE_UNVISITED); | |
| 156 } |
