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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/accessibility/platform/fuchsia/browser_accessibility_manager_fuchsia.h"
#include <lib/inspect/component/cpp/component.h>
#include "base/fuchsia/fuchsia_logging.h"
#include "ui/accessibility/ax_event_generator.h"
#include "ui/accessibility/ax_node.h"
#include "ui/accessibility/platform/ax_platform_tree_manager_delegate.h"
#include "ui/accessibility/platform/browser_accessibility_manager.h"
#include "ui/accessibility/platform/fuchsia/accessibility_bridge_fuchsia_registry.h"
#include "ui/accessibility/platform/fuchsia/browser_accessibility_fuchsia.h"
namespace ui {
namespace {
// Accessibility bridge instance to use for tests, if set.
AccessibilityBridgeFuchsia* g_accessibility_bridge_for_test = nullptr;
} // namespace
// static
BrowserAccessibilityManager* BrowserAccessibilityManager::Create(
const AXTreeUpdate& initial_tree,
AXNodeIdDelegate& node_id_delegate,
AXPlatformTreeManagerDelegate* delegate) {
return new BrowserAccessibilityManagerFuchsia(initial_tree, node_id_delegate,
delegate);
}
// static
BrowserAccessibilityManager* BrowserAccessibilityManager::Create(
AXNodeIdDelegate& node_id_delegate,
AXPlatformTreeManagerDelegate* delegate) {
return new BrowserAccessibilityManagerFuchsia(
BrowserAccessibilityManagerFuchsia::GetEmptyDocument(), node_id_delegate,
delegate);
}
BrowserAccessibilityManagerFuchsia::BrowserAccessibilityManagerFuchsia(
const AXTreeUpdate& initial_tree,
AXNodeIdDelegate& node_id_delegate,
AXPlatformTreeManagerDelegate* delegate)
: BrowserAccessibilityManager(node_id_delegate, delegate) {
Initialize(initial_tree);
AccessibilityBridgeFuchsia* accessibility_bridge = GetAccessibilityBridge();
if (accessibility_bridge) {
inspect_node_ = accessibility_bridge->GetInspectNode();
tree_dump_node_ = inspect_node_.CreateLazyNode("tree-data", [this]() {
inspect::Inspector inspector;
auto str = ax_tree()->ToString();
auto str_capacity = str.capacity();
inspector.GetRoot().CreateString(GetTreeID().ToString(), std::move(str),
&inspector);
// Test to check if the string fit in memory.
if (inspector.GetStats().failed_allocations > 0) {
ZX_LOG(WARNING, ZX_OK)
<< "Inspector had failed allocations. Some semantic tree data may "
"be missing. Size of the string we tried to store: "
<< str_capacity << " bytes";
}
return fpromise::make_ok_promise(inspector);
});
}
}
BrowserAccessibilityManagerFuchsia::~BrowserAccessibilityManagerFuchsia() =
default;
AccessibilityBridgeFuchsia*
BrowserAccessibilityManagerFuchsia::GetAccessibilityBridge() const {
// !!! Safety warning !!! This function is directly called during the
// parent class destructor. As such, it shouldn't depend on any member
// variables from this class, as they have already been destroyed.
//
// Failing to follow this rule would be undefined behavior, and can lead to
// unsafe/unexpected behaviors. See ASAN options
// `-fsanitize-memory-use-after-dtor`
if (g_accessibility_bridge_for_test) {
return g_accessibility_bridge_for_test;
}
gfx::NativeWindow top_level_native_window =
delegate_ ? delegate_->GetTopLevelNativeWindow() : gfx::NativeWindow();
aura::Window* accessibility_bridge_key =
top_level_native_window ? top_level_native_window->GetRootWindow()
: nullptr;
if (!accessibility_bridge_key) {
return nullptr;
}
AccessibilityBridgeFuchsiaRegistry* accessibility_bridge_registry =
AccessibilityBridgeFuchsiaRegistry::GetInstance();
DCHECK(accessibility_bridge_registry);
return accessibility_bridge_registry->GetAccessibilityBridge(
accessibility_bridge_key);
}
void BrowserAccessibilityManagerFuchsia::FireFocusEvent(AXNode* node) {
AXTreeManager::FireFocusEvent(node);
if (!GetAccessibilityBridge())
return;
BrowserAccessibilityFuchsia* new_focus_fuchsia =
ToBrowserAccessibilityFuchsia(GetFromAXNode(node));
BrowserAccessibilityFuchsia* old_focus_fuchsia =
ToBrowserAccessibilityFuchsia(GetFromAXNode(GetLastFocusedNode()));
if (old_focus_fuchsia)
old_focus_fuchsia->OnDataChanged();
if (new_focus_fuchsia)
new_focus_fuchsia->OnDataChanged();
}
// static
AXTreeUpdate BrowserAccessibilityManagerFuchsia::GetEmptyDocument() {
AXNodeData empty_document;
empty_document.id = kInitialEmptyDocumentRootNodeID;
empty_document.role = ax::mojom::Role::kRootWebArea;
empty_document.AddBoolAttribute(ax::mojom::BoolAttribute::kBusy, true);
AXTreeUpdate update;
update.root_id = empty_document.id;
update.nodes.push_back(empty_document);
return update;
}
void BrowserAccessibilityManagerFuchsia::FireBlinkEvent(
ax::mojom::Event event_type,
BrowserAccessibility* node,
int action_request_id) {
BrowserAccessibilityManager::FireBlinkEvent(event_type, node,
action_request_id);
// Blink fires a hover event on the result of a hit test, so we should process
// it here.
if (event_type == ax::mojom::Event::kHover)
OnHitTestResult(action_request_id, node);
}
void BrowserAccessibilityManagerFuchsia::FireGeneratedEvent(
AXEventGenerator::Event event_type,
const AXNode* node) {
BrowserAccessibilityManager::FireGeneratedEvent(event_type, node);
if (!GetAccessibilityBridge()) {
return;
}
switch (event_type) {
case AXEventGenerator::Event::SCROLL_VERTICAL_POSITION_CHANGED:
case AXEventGenerator::Event::SCROLL_HORIZONTAL_POSITION_CHANGED: {
BrowserAccessibilityFuchsia* browser_accessibility_fuchsia =
ToBrowserAccessibilityFuchsia(GetFromAXNode(node));
browser_accessibility_fuchsia->OnScrollChanged();
break;
}
default:
break;
}
}
void BrowserAccessibilityManagerFuchsia::OnHitTestResult(
int action_request_id,
BrowserAccessibility* node) {
if (!GetAccessibilityBridge())
return;
std::optional<uint32_t> hit_result_id;
if (node) {
BrowserAccessibilityFuchsia* hit_result =
ToBrowserAccessibilityFuchsia(node);
DCHECK(hit_result);
hit_result_id = hit_result->GetFuchsiaNodeID();
}
GetAccessibilityBridge()->OnAccessibilityHitTestResult(action_request_id,
hit_result_id);
}
void BrowserAccessibilityManagerFuchsia::UpdateDeviceScaleFactor() {
AccessibilityBridgeFuchsia* accessibility_bridge = GetAccessibilityBridge();
if (accessibility_bridge)
device_scale_factor_ = accessibility_bridge->GetDeviceScaleFactor();
else
BrowserAccessibilityManager::UpdateDeviceScaleFactor();
}
// static
void BrowserAccessibilityManagerFuchsia::SetAccessibilityBridgeForTest(
AccessibilityBridgeFuchsia* accessibility_bridge_for_test) {
// Only allow transition from nullptr to non-nullptr, or vice versa.
CHECK(!g_accessibility_bridge_for_test || !accessibility_bridge_for_test)
<< "Setting the accessibility bridge to two different values is not "
"allowed.";
g_accessibility_bridge_for_test = accessibility_bridge_for_test;
}
} // namespace ui
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