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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
#ifndef mozilla_a11y_BaseAccessibles_h__
#define mozilla_a11y_BaseAccessibles_h__
#include "AccessibleWrap.h"
#include "HyperTextAccessible.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_INLINE_DECL_REFCOUNTING_INHERITED(LeafAccessible, AccessibleWrap)
// LocalAccessible
virtual LocalAccessible* LocalChildAtPoint(
int32_t aX, int32_t aY, EWhichChildAtPoint aWhichChild) override;
bool InsertChildAt(uint32_t aIndex, LocalAccessible* aChild) final;
bool RemoveChild(LocalAccessible* aChild) final;
virtual bool IsAcceptableChild(nsIContent* aEl) const override;
protected:
virtual ~LeafAccessible() {}
};
/**
* 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 focus the host
* accessible programmatically.
*/
class LinkableAccessible : public AccessibleWrap {
public:
LinkableAccessible(nsIContent* aContent, DocAccessible* aDoc)
: AccessibleWrap(aContent, aDoc) {}
NS_INLINE_DECL_REFCOUNTING_INHERITED(LinkableAccessible, AccessibleWrap)
// LocalAccessible
virtual void Value(nsString& aValue) const override;
virtual uint64_t NativeLinkState() const override;
virtual void TakeFocus() const override;
// ActionAccessible
virtual KeyBinding AccessKey() const override;
// ActionAccessible helpers
const LocalAccessible* ActionWalk(bool* aIsLink = nullptr,
bool* aIsOnclick = nullptr) const;
protected:
virtual ~LinkableAccessible() {}
};
/**
* A simple accessible that gets its enumerated role.
*/
template <a11y::role R>
class EnumRoleAccessible : public AccessibleWrap {
public:
EnumRoleAccessible(nsIContent* aContent, DocAccessible* aDoc)
: AccessibleWrap(aContent, aDoc) {}
NS_IMETHOD QueryInterface(REFNSIID aIID, void** aPtr) override {
return LocalAccessible::QueryInterface(aIID, aPtr);
}
// LocalAccessible
virtual a11y::role NativeRole() const override { return R; }
protected:
virtual ~EnumRoleAccessible() {}
};
/**
* Like EnumRoleAccessible, but with text support.
*/
template <a11y::role R>
class EnumRoleHyperTextAccessible : public HyperTextAccessible {
public:
EnumRoleHyperTextAccessible(nsIContent* aContent, DocAccessible* aDoc)
: HyperTextAccessible(aContent, aDoc) {}
// LocalAccessible
virtual a11y::role NativeRole() const override { return R; }
protected:
virtual ~EnumRoleHyperTextAccessible() {}
};
/**
* A wrapper accessible around native accessible to connect it with
* crossplatform accessible tree.
*/
class DummyAccessible : public AccessibleWrap {
public:
explicit DummyAccessible(DocAccessible* aDocument = nullptr)
: AccessibleWrap(nullptr, aDocument) {
// IsDefunct() asserts if mContent is null, which is always true for
// DummyAccessible. We can prevent this by setting eSharedNode.
mStateFlags |= eSharedNode;
}
uint64_t NativeState() const final;
uint64_t NativeInteractiveState() const final;
uint64_t NativeLinkState() const final;
bool NativelyUnavailable() const final;
void ApplyARIAState(uint64_t* aState) const final;
protected:
virtual ~DummyAccessible() {}
};
} // namespace a11y
} // namespace mozilla
#endif