gecko-dev/accessible/generic/BaseAccessibles.cpp
2014-10-21 20:49:28 -04:00

278 lines
6.1 KiB
C++

/* -*- 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 "BaseAccessibles.h"
#include "Accessible-inl.h"
#include "HyperTextAccessibleWrap.h"
#include "nsAccessibilityService.h"
#include "nsAccUtils.h"
#include "nsCoreUtils.h"
#include "Role.h"
#include "States.h"
#include "nsIURI.h"
using namespace mozilla::a11y;
////////////////////////////////////////////////////////////////////////////////
// LeafAccessible
////////////////////////////////////////////////////////////////////////////////
LeafAccessible::
LeafAccessible(nsIContent* aContent, DocAccessible* aDoc) :
AccessibleWrap(aContent, aDoc)
{
}
NS_IMPL_ISUPPORTS_INHERITED0(LeafAccessible, Accessible)
////////////////////////////////////////////////////////////////////////////////
// LeafAccessible: Accessible public
Accessible*
LeafAccessible::ChildAtPoint(int32_t aX, int32_t aY,
EWhichChildAtPoint aWhichChild)
{
// Don't walk into leaf accessibles.
return this;
}
bool
LeafAccessible::InsertChildAt(uint32_t aIndex, Accessible* aChild)
{
NS_NOTREACHED("InsertChildAt called on leaf accessible!");
return false;
}
bool
LeafAccessible::RemoveChild(Accessible* aChild)
{
NS_NOTREACHED("RemoveChild called on leaf accessible!");
return false;
}
////////////////////////////////////////////////////////////////////////////////
// LeafAccessible: Accessible private
void
LeafAccessible::CacheChildren()
{
// No children for leaf accessible.
}
////////////////////////////////////////////////////////////////////////////////
// LinkableAccessible
////////////////////////////////////////////////////////////////////////////////
LinkableAccessible::
LinkableAccessible(nsIContent* aContent, DocAccessible* aDoc) :
AccessibleWrap(aContent, aDoc),
mActionAcc(nullptr),
mIsLink(false),
mIsOnclick(false)
{
}
NS_IMPL_ISUPPORTS_INHERITED0(LinkableAccessible, AccessibleWrap)
////////////////////////////////////////////////////////////////////////////////
// LinkableAccessible. nsIAccessible
void
LinkableAccessible::TakeFocus()
{
if (mActionAcc)
mActionAcc->TakeFocus();
else
AccessibleWrap::TakeFocus();
}
uint64_t
LinkableAccessible::NativeLinkState() const
{
if (mIsLink)
return states::LINKED | (mActionAcc->LinkState() & states::TRAVERSED);
return 0;
}
void
LinkableAccessible::Value(nsString& aValue)
{
aValue.Truncate();
Accessible::Value(aValue);
if (!aValue.IsEmpty())
return;
if (aValue.IsEmpty() && mIsLink)
mActionAcc->Value(aValue);
}
uint8_t
LinkableAccessible::ActionCount()
{
return (mIsOnclick || mIsLink) ? 1 : 0;
}
void
LinkableAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName)
{
aName.Truncate();
// Action 0 (default action): Jump to link
if (aIndex == eAction_Jump) {
if (mIsLink)
aName.AssignLiteral("jump");
else if (mIsOnclick)
aName.AssignLiteral("click");
}
}
bool
LinkableAccessible::DoAction(uint8_t aIndex)
{
if (aIndex != eAction_Jump)
return false;
return mActionAcc ? mActionAcc->DoAction(aIndex) :
AccessibleWrap::DoAction(aIndex);
}
KeyBinding
LinkableAccessible::AccessKey() const
{
return mActionAcc ?
mActionAcc->AccessKey() : Accessible::AccessKey();
}
////////////////////////////////////////////////////////////////////////////////
// LinkableAccessible. Accessible
void
LinkableAccessible::Shutdown()
{
mIsLink = false;
mIsOnclick = false;
mActionAcc = nullptr;
AccessibleWrap::Shutdown();
}
////////////////////////////////////////////////////////////////////////////////
// LinkableAccessible: HyperLinkAccessible
already_AddRefed<nsIURI>
LinkableAccessible::AnchorURIAt(uint32_t aAnchorIndex)
{
if (mIsLink) {
NS_ASSERTION(mActionAcc->IsLink(), "HyperLink isn't implemented.");
if (mActionAcc->IsLink())
return mActionAcc->AnchorURIAt(aAnchorIndex);
}
return nullptr;
}
////////////////////////////////////////////////////////////////////////////////
// LinkableAccessible: Accessible protected
void
LinkableAccessible::BindToParent(Accessible* aParent,
uint32_t aIndexInParent)
{
AccessibleWrap::BindToParent(aParent, aIndexInParent);
// Cache action content.
mActionAcc = nullptr;
mIsLink = false;
mIsOnclick = false;
if (nsCoreUtils::HasClickListener(mContent)) {
mIsOnclick = true;
return;
}
// XXX: The logic looks broken since the click listener may be registered
// on non accessible node in parent chain but this node is skipped when tree
// is traversed.
Accessible* walkUpAcc = this;
while ((walkUpAcc = walkUpAcc->Parent()) && !walkUpAcc->IsDoc()) {
if (walkUpAcc->LinkState() & states::LINKED) {
mIsLink = true;
mActionAcc = walkUpAcc;
return;
}
if (nsCoreUtils::HasClickListener(walkUpAcc->GetContent())) {
mActionAcc = walkUpAcc;
mIsOnclick = true;
return;
}
}
}
void
LinkableAccessible::UnbindFromParent()
{
mActionAcc = nullptr;
mIsLink = false;
mIsOnclick = false;
AccessibleWrap::UnbindFromParent();
}
////////////////////////////////////////////////////////////////////////////////
// EnumRoleAccessible
////////////////////////////////////////////////////////////////////////////////
EnumRoleAccessible::
EnumRoleAccessible(nsIContent* aNode, DocAccessible* aDoc, roles::Role aRole) :
AccessibleWrap(aNode, aDoc), mRole(aRole)
{
}
NS_IMPL_ISUPPORTS_INHERITED0(EnumRoleAccessible, Accessible)
role
EnumRoleAccessible::NativeRole()
{
return mRole;
}
////////////////////////////////////////////////////////////////////////////////
// DummyAccessible
////////////////////////////////////////////////////////////////////////////////
uint64_t
DummyAccessible::NativeState()
{
return 0;
}
uint64_t
DummyAccessible::NativeInteractiveState() const
{
return 0;
}
uint64_t
DummyAccessible::NativeLinkState() const
{
return 0;
}
bool
DummyAccessible::NativelyUnavailable() const
{
return false;
}
void
DummyAccessible::ApplyARIAState(uint64_t* aState) const
{
}