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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /accessible/base/AccessibleOrProxy.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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_AccessibleOrProxy_h
+#define mozilla_a11y_AccessibleOrProxy_h
+
+#include "mozilla/a11y/Accessible.h"
+#include "mozilla/a11y/ProxyAccessible.h"
+#include "mozilla/a11y/Role.h"
+
+#include <stdint.h>
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * This class stores an Accessible* or a ProxyAccessible* in a safe manner
+ * with size sizeof(void*).
+ */
+class AccessibleOrProxy
+{
+public:
+ MOZ_IMPLICIT AccessibleOrProxy(Accessible* aAcc) :
+ mBits(reinterpret_cast<uintptr_t>(aAcc)) {}
+ MOZ_IMPLICIT AccessibleOrProxy(ProxyAccessible* aProxy) :
+ mBits(aProxy ? (reinterpret_cast<uintptr_t>(aProxy) | IS_PROXY) : 0) {}
+ MOZ_IMPLICIT AccessibleOrProxy(decltype(nullptr)) : mBits(0) {}
+
+ bool IsProxy() const { return mBits & IS_PROXY; }
+ ProxyAccessible* AsProxy() const
+ {
+ if (IsProxy()) {
+ return reinterpret_cast<ProxyAccessible*>(mBits & ~IS_PROXY);
+ }
+
+ return nullptr;
+ }
+
+ bool IsAccessible() const { return !IsProxy(); }
+ Accessible* AsAccessible() const
+ {
+ if (IsAccessible()) {
+ return reinterpret_cast<Accessible*>(mBits);
+ }
+
+ return nullptr;
+ }
+
+ bool IsNull() const { return mBits == 0; }
+
+ uint32_t ChildCount() const
+ {
+ if (IsProxy()) {
+ return AsProxy()->ChildrenCount();
+ }
+
+ return AsAccessible()->ChildCount();
+ }
+
+ /**
+ * Return the child object either an accessible or a proxied accessible at
+ * the given index.
+ */
+ AccessibleOrProxy ChildAt(uint32_t aIdx)
+ {
+ if (IsProxy()) {
+ return AsProxy()->ChildAt(aIdx);
+ }
+
+ return AsAccessible()->GetChildAt(aIdx);
+ }
+
+ /**
+ * Return the first child object.
+ */
+ AccessibleOrProxy FirstChild()
+ {
+ if (IsProxy()) {
+ return AsProxy()->FirstChild();
+ }
+
+ return AsAccessible()->FirstChild();
+ }
+
+ /**
+ * Return the first child object.
+ */
+ AccessibleOrProxy LastChild()
+ {
+ if (IsProxy()) {
+ return AsProxy()->LastChild();
+ }
+
+ return AsAccessible()->LastChild();
+ }
+
+ role Role() const
+ {
+ if (IsProxy()) {
+ return AsProxy()->Role();
+ }
+
+ return AsAccessible()->Role();
+ }
+
+ AccessibleOrProxy Parent() const;
+
+ // XXX these are implementation details that ideally would not be exposed.
+ uintptr_t Bits() const { return mBits; }
+ void SetBits(uintptr_t aBits) { mBits = aBits; }
+
+private:
+ uintptr_t mBits;
+ static const uintptr_t IS_PROXY = 0x1;
+};
+
+}
+}
+
+#endif