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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/accessibility/platform/ax_platform_node.h"
#include "base/containers/hash_tables.h"
#include "base/lazy_instance.h"
#include "build/build_config.h"
#include "ui/accessibility/ax_node_data.h"
#include "ui/accessibility/platform/ax_platform_node_delegate.h"
namespace ui {
namespace {
using UniqueIdMap = base::hash_map<int32_t, AXPlatformNode*>;
// Map from each AXPlatformNode's unique id to its instance.
base::LazyInstance<UniqueIdMap> g_unique_id_map =
LAZY_INSTANCE_INITIALIZER;
}
#if !defined(PLATFORM_HAS_AX_PLATFORM_NODE_IMPL)
// static
AXPlatformNode* AXPlatformNode::Create(AXPlatformNodeDelegate* delegate) {
return nullptr;
}
#endif // !defined(PLATFORM_HAS_AX_PLATFORM_NODE_IMPL)
#if !defined(OS_WIN)
// This is the default implementation for platforms where native views
// accessibility is unsupported or unfinished.
//
// static
AXPlatformNode* AXPlatformNode::FromNativeViewAccessible(
gfx::NativeViewAccessible accessible) {
return nullptr;
}
#endif
// static
int32_t AXPlatformNode::GetNextUniqueId() {
static int32_t next_unique_id = 1;
int32_t unique_id = next_unique_id;
if (next_unique_id == INT32_MAX)
next_unique_id = 1;
else
next_unique_id++;
return unique_id;
}
AXPlatformNode::AXPlatformNode() : unique_id_(GetNextUniqueId()) {
g_unique_id_map.Get()[unique_id_] = this;
}
AXPlatformNode::~AXPlatformNode() {
if (unique_id_)
g_unique_id_map.Get().erase(unique_id_);
}
void AXPlatformNode::Destroy() {
g_unique_id_map.Get().erase(unique_id_);
unique_id_ = 0;
}
AXPlatformNode* AXPlatformNode::GetFromUniqueId(int32_t unique_id) {
UniqueIdMap* unique_ids = g_unique_id_map.Pointer();
auto iter = unique_ids->find(unique_id);
if (iter != unique_ids->end())
return iter->second;
return nullptr;
}
} // namespace ui
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