123 lines
2.6 KiB
C++
123 lines
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_a11y_AccessibleOrProxy_h
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#define mozilla_a11y_AccessibleOrProxy_h
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#include "mozilla/a11y/Accessible.h"
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#include "mozilla/a11y/ProxyAccessible.h"
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#include "mozilla/a11y/Role.h"
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#include <stdint.h>
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namespace mozilla {
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namespace a11y {
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/**
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* This class stores an Accessible* or a ProxyAccessible* in a safe manner
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* with size sizeof(void*).
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*/
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class AccessibleOrProxy
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{
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public:
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MOZ_IMPLICIT AccessibleOrProxy(Accessible* aAcc) :
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mBits(reinterpret_cast<uintptr_t>(aAcc)) {}
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MOZ_IMPLICIT AccessibleOrProxy(ProxyAccessible* aProxy) :
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mBits(aProxy ? (reinterpret_cast<uintptr_t>(aProxy) | IS_PROXY) : 0) {}
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MOZ_IMPLICIT AccessibleOrProxy(decltype(nullptr)) : mBits(0) {}
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bool IsProxy() const { return mBits & IS_PROXY; }
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ProxyAccessible* AsProxy() const
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{
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if (IsProxy()) {
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return reinterpret_cast<ProxyAccessible*>(mBits & ~IS_PROXY);
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}
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return nullptr;
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}
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bool IsAccessible() const { return !IsProxy(); }
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Accessible* AsAccessible() const
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{
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if (IsAccessible()) {
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return reinterpret_cast<Accessible*>(mBits);
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}
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return nullptr;
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}
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bool IsNull() const { return mBits == 0; }
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uint32_t ChildCount() const
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{
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if (IsProxy()) {
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return AsProxy()->ChildrenCount();
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}
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return AsAccessible()->ChildCount();
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}
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/**
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* Return the child object either an accessible or a proxied accessible at
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* the given index.
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*/
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AccessibleOrProxy ChildAt(uint32_t aIdx)
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{
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if (IsProxy()) {
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return AsProxy()->ChildAt(aIdx);
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}
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return AsAccessible()->GetChildAt(aIdx);
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}
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/**
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* Return the first child object.
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*/
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AccessibleOrProxy FirstChild()
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{
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if (IsProxy()) {
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return AsProxy()->FirstChild();
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}
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return AsAccessible()->FirstChild();
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}
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/**
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* Return the first child object.
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*/
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AccessibleOrProxy LastChild()
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{
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if (IsProxy()) {
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return AsProxy()->LastChild();
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}
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return AsAccessible()->LastChild();
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}
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role Role() const
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{
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if (IsProxy()) {
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return AsProxy()->Role();
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}
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return AsAccessible()->Role();
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}
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AccessibleOrProxy Parent() const;
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// XXX these are implementation details that ideally would not be exposed.
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uintptr_t Bits() const { return mBits; }
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void SetBits(uintptr_t aBits) { mBits = aBits; }
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private:
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uintptr_t mBits;
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static const uintptr_t IS_PROXY = 0x1;
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};
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}
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}
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#endif
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