gecko-dev/accessible/generic/BaseAccessibles.h

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/* -*- 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/. */
#ifndef mozilla_a11y_BaseAccessibles_h__
#define mozilla_a11y_BaseAccessibles_h__
#include "AccessibleWrap.h"
#include "HyperTextAccessibleWrap.h"
class nsIContent;
/**
* This file contains a number of classes that are used as base
* classes for the different accessibility implementations of
* the HTML and XUL widget sets. --jgaunt
*/
namespace mozilla {
namespace a11y {
/**
* Leaf version of DOM Accessible -- has no children
*/
class LeafAccessible : public AccessibleWrap
{
public:
LeafAccessible(nsIContent* aContent, DocAccessible* aDoc);
// nsISupports
NS_DECL_ISUPPORTS_INHERITED
// Accessible
virtual Accessible* ChildAtPoint(int32_t aX, int32_t aY,
EWhichChildAtPoint aWhichChild);
virtual bool InsertChildAt(uint32_t aIndex, Accessible* aChild) MOZ_OVERRIDE MOZ_FINAL;
virtual bool RemoveChild(Accessible* aChild) MOZ_OVERRIDE MOZ_FINAL;
protected:
virtual ~LeafAccessible() {}
// Accessible
virtual void CacheChildren();
};
/**
* Used for text or image accessible nodes contained by link accessibles or
* accessibles for nodes with registered click event handler. It knows how to
* report the state of the host link (traveled or not) and can activate (click)
* the host accessible programmatically.
*/
class LinkableAccessible : public AccessibleWrap
{
public:
enum { eAction_Jump = 0 };
LinkableAccessible(nsIContent* aContent, DocAccessible* aDoc);
NS_DECL_ISUPPORTS_INHERITED
// nsIAccessible
NS_IMETHOD GetActionName(uint8_t aIndex, nsAString& aName);
NS_IMETHOD DoAction(uint8_t index);
NS_IMETHOD TakeFocus();
// Accessible
virtual void Shutdown();
virtual void Value(nsString& aValue);
virtual uint64_t NativeLinkState() const;
// ActionAccessible
virtual uint8_t ActionCount();
virtual KeyBinding AccessKey() const;
// HyperLinkAccessible
virtual already_AddRefed<nsIURI> AnchorURIAt(uint32_t aAnchorIndex);
protected:
virtual ~LinkableAccessible() {}
// Accessible
virtual void BindToParent(Accessible* aParent, uint32_t aIndexInParent);
virtual void UnbindFromParent();
/**
* Parent accessible that provides an action for this linkable accessible.
*/
Accessible* mActionAcc;
bool mIsLink;
bool mIsOnclick;
};
/**
* A simple accessible that gets its enumerated role passed into constructor.
*/
class EnumRoleAccessible : public AccessibleWrap
{
public:
EnumRoleAccessible(nsIContent* aContent, DocAccessible* aDoc,
a11y::role aRole);
NS_DECL_ISUPPORTS_INHERITED
// Accessible
virtual a11y::role NativeRole();
protected:
virtual ~EnumRoleAccessible() { }
a11y::role mRole;
};
/**
* A wrapper accessible around native accessible to connect it with
* crossplatform accessible tree.
*/
class DummyAccessible : public AccessibleWrap
{
public:
DummyAccessible() : AccessibleWrap(nullptr, nullptr) { }
virtual ~DummyAccessible() { }
virtual uint64_t NativeState() MOZ_OVERRIDE MOZ_FINAL;
virtual uint64_t NativeInteractiveState() const MOZ_OVERRIDE MOZ_FINAL;
virtual uint64_t NativeLinkState() const MOZ_OVERRIDE MOZ_FINAL;
virtual bool NativelyUnavailable() const MOZ_OVERRIDE MOZ_FINAL;
virtual void ApplyARIAState(uint64_t* aState) const MOZ_OVERRIDE MOZ_FINAL;
};
} // namespace a11y
} // namespace mozilla
#endif