blob: d42febd48560897260f9b449c6ccf8beb79a944d [file] [log] [blame]
// Copyright 2013 The Flutter 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 "accessibility_bridge.h"
#include <functional>
#include <utility>
#include "flutter/third_party/accessibility/ax/ax_tree_manager_map.h"
#include "flutter/third_party/accessibility/ax/ax_tree_update.h"
#include "flutter/third_party/accessibility/base/logging.h"
namespace flutter { // namespace
constexpr int kHasScrollingAction =
FlutterSemanticsAction::kFlutterSemanticsActionScrollLeft |
FlutterSemanticsAction::kFlutterSemanticsActionScrollRight |
FlutterSemanticsAction::kFlutterSemanticsActionScrollUp |
FlutterSemanticsAction::kFlutterSemanticsActionScrollDown;
// AccessibilityBridge
AccessibilityBridge::AccessibilityBridge()
: tree_(std::make_unique<ui::AXTree>()) {
event_generator_.SetTree(tree_.get());
tree_->AddObserver(static_cast<ui::AXTreeObserver*>(this));
ui::AXTreeData data = tree_->data();
data.tree_id = ui::AXTreeID::CreateNewAXTreeID();
tree_->UpdateData(data);
ui::AXTreeManagerMap::GetInstance().AddTreeManager(tree_->GetAXTreeID(),
this);
}
AccessibilityBridge::~AccessibilityBridge() {
event_generator_.ReleaseTree();
tree_->RemoveObserver(static_cast<ui::AXTreeObserver*>(this));
}
void AccessibilityBridge::AddFlutterSemanticsNodeUpdate(
const FlutterSemanticsNode2& node) {
pending_semantics_node_updates_[node.id] = FromFlutterSemanticsNode(node);
}
void AccessibilityBridge::AddFlutterSemanticsCustomActionUpdate(
const FlutterSemanticsCustomAction2& action) {
pending_semantics_custom_action_updates_[action.id] =
FromFlutterSemanticsCustomAction(action);
}
void AccessibilityBridge::CommitUpdates() {
// AXTree cannot move a node in a single update.
// This must be split across two updates:
//
// * Update 1: remove nodes from their old parents.
// * Update 2: re-add nodes (including their children) to their new parents.
//
// First, start by removing nodes if necessary.
std::optional<ui::AXTreeUpdate> remove_reparented =
CreateRemoveReparentedNodesUpdate();
if (remove_reparented.has_value()) {
tree_->Unserialize(remove_reparented.value());
std::string error = tree_->error();
if (!error.empty()) {
FML_LOG(ERROR) << "Failed to update ui::AXTree, error: " << error;
assert(false);
return;
}
}
// Second, apply the pending node updates. This also moves reparented nodes to
// their new parents if needed.
ui::AXTreeUpdate update{.tree_data = tree_->data()};
// Figure out update order, ui::AXTree only accepts update in tree order,
// where parent node must come before the child node in
// ui::AXTreeUpdate.nodes. We start with picking a random node and turn the
// entire subtree into a list. We pick another node from the remaining update,
// and keep doing so until the update map is empty. We then concatenate the
// lists in the reversed order, this guarantees parent updates always come
// before child updates. If the root is in the update, it is guaranteed to
// be the first node of the last list.
std::vector<std::vector<SemanticsNode>> results;
while (!pending_semantics_node_updates_.empty()) {
auto begin = pending_semantics_node_updates_.begin();
SemanticsNode target = begin->second;
std::vector<SemanticsNode> sub_tree_list;
GetSubTreeList(target, sub_tree_list);
results.push_back(sub_tree_list);
pending_semantics_node_updates_.erase(begin);
}
for (size_t i = results.size(); i > 0; i--) {
for (SemanticsNode node : results[i - 1]) {
ConvertFlutterUpdate(node, update);
}
}
// The first update must set the tree's root, which is guaranteed to be the
// last list's first node. A tree's root node never changes, though it can be
// modified.
if (!results.empty() && GetRootAsAXNode()->id() == ui::AXNode::kInvalidAXID) {
FML_DCHECK(!results.back().empty());
update.root_id = results.back().front().id;
}
tree_->Unserialize(update);
pending_semantics_node_updates_.clear();
pending_semantics_custom_action_updates_.clear();
std::string error = tree_->error();
if (!error.empty()) {
FML_LOG(ERROR) << "Failed to update ui::AXTree, error: " << error;
return;
}
// Handles accessibility events as the result of the semantics update.
for (const auto& targeted_event : event_generator_) {
auto event_target =
GetFlutterPlatformNodeDelegateFromID(targeted_event.node->id());
if (event_target.expired()) {
continue;
}
OnAccessibilityEvent(targeted_event);
}
event_generator_.ClearEvents();
}
std::weak_ptr<FlutterPlatformNodeDelegate>
AccessibilityBridge::GetFlutterPlatformNodeDelegateFromID(
AccessibilityNodeId id) const {
const auto iter = id_wrapper_map_.find(id);
if (iter != id_wrapper_map_.end()) {
return iter->second;
}
return std::weak_ptr<FlutterPlatformNodeDelegate>();
}
const ui::AXTreeData& AccessibilityBridge::GetAXTreeData() const {
return tree_->data();
}
const std::vector<ui::AXEventGenerator::TargetedEvent>
AccessibilityBridge::GetPendingEvents() const {
std::vector<ui::AXEventGenerator::TargetedEvent> result(
event_generator_.begin(), event_generator_.end());
return result;
}
void AccessibilityBridge::OnNodeWillBeDeleted(ui::AXTree* tree,
ui::AXNode* node) {}
void AccessibilityBridge::OnSubtreeWillBeDeleted(ui::AXTree* tree,
ui::AXNode* node) {}
void AccessibilityBridge::OnNodeReparented(ui::AXTree* tree, ui::AXNode* node) {
}
void AccessibilityBridge::OnRoleChanged(ui::AXTree* tree,
ui::AXNode* node,
ax::mojom::Role old_role,
ax::mojom::Role new_role) {}
void AccessibilityBridge::OnNodeCreated(ui::AXTree* tree, ui::AXNode* node) {
BASE_DCHECK(node);
id_wrapper_map_[node->id()] = CreateFlutterPlatformNodeDelegate();
id_wrapper_map_[node->id()]->Init(
std::static_pointer_cast<FlutterPlatformNodeDelegate::OwnerBridge>(
shared_from_this()),
node);
}
void AccessibilityBridge::OnNodeDeleted(ui::AXTree* tree,
AccessibilityNodeId node_id) {
BASE_DCHECK(node_id != ui::AXNode::kInvalidAXID);
if (id_wrapper_map_.find(node_id) != id_wrapper_map_.end()) {
id_wrapper_map_.erase(node_id);
}
}
void AccessibilityBridge::OnAtomicUpdateFinished(
ui::AXTree* tree,
bool root_changed,
const std::vector<ui::AXTreeObserver::Change>& changes) {
// The Flutter semantics update does not include child->parent relationship
// We have to update the relative bound offset container id here in order
// to calculate the screen bound correctly.
for (const auto& change : changes) {
ui::AXNode* node = change.node;
const ui::AXNodeData& data = node->data();
AccessibilityNodeId offset_container_id = -1;
if (node->parent()) {
offset_container_id = node->parent()->id();
}
node->SetLocation(offset_container_id, data.relative_bounds.bounds,
data.relative_bounds.transform.get());
}
}
std::optional<ui::AXTreeUpdate>
AccessibilityBridge::CreateRemoveReparentedNodesUpdate() {
std::unordered_map<int32_t, ui::AXNodeData> updates;
for (auto node_update : pending_semantics_node_updates_) {
for (int32_t child_id : node_update.second.children_in_traversal_order) {
// Skip nodes that don't exist or have a parent in the current tree.
ui::AXNode* child = tree_->GetFromId(child_id);
if (!child) {
continue;
}
// Flutter's root node should never be reparented.
assert(child->parent());
// Skip nodes whose parents are unchanged.
if (child->parent()->id() == node_update.second.id) {
continue;
}
// This pending update moves the current child node.
// That new child must have a corresponding pending update.
assert(pending_semantics_node_updates_.find(child_id) !=
pending_semantics_node_updates_.end());
// Create an update to remove the child from its previous parent.
int32_t parent_id = child->parent()->id();
if (updates.find(parent_id) == updates.end()) {
updates[parent_id] = tree_->GetFromId(parent_id)->data();
}
ui::AXNodeData* parent = &updates[parent_id];
auto iter = std::find(parent->child_ids.begin(), parent->child_ids.end(),
child_id);
assert(iter != parent->child_ids.end());
parent->child_ids.erase(iter);
}
}
if (updates.empty()) {
return std::nullopt;
}
ui::AXTreeUpdate update{
.tree_data = tree_->data(),
.nodes = std::vector<ui::AXNodeData>(),
};
for (std::pair<int32_t, ui::AXNodeData> data : updates) {
update.nodes.push_back(std::move(data.second));
}
return update;
}
// Private method.
void AccessibilityBridge::GetSubTreeList(const SemanticsNode& target,
std::vector<SemanticsNode>& result) {
result.push_back(target);
for (int32_t child : target.children_in_traversal_order) {
auto iter = pending_semantics_node_updates_.find(child);
if (iter != pending_semantics_node_updates_.end()) {
SemanticsNode node = iter->second;
GetSubTreeList(node, result);
pending_semantics_node_updates_.erase(iter);
}
}
}
void AccessibilityBridge::ConvertFlutterUpdate(const SemanticsNode& node,
ui::AXTreeUpdate& tree_update) {
ui::AXNodeData node_data;
node_data.id = node.id;
SetRoleFromFlutterUpdate(node_data, node);
SetStateFromFlutterUpdate(node_data, node);
SetActionsFromFlutterUpdate(node_data, node);
SetBooleanAttributesFromFlutterUpdate(node_data, node);
SetIntAttributesFromFlutterUpdate(node_data, node);
SetIntListAttributesFromFlutterUpdate(node_data, node);
SetStringListAttributesFromFlutterUpdate(node_data, node);
SetNameFromFlutterUpdate(node_data, node);
SetValueFromFlutterUpdate(node_data, node);
SetTooltipFromFlutterUpdate(node_data, node);
node_data.relative_bounds.bounds.SetRect(node.rect.left, node.rect.top,
node.rect.right - node.rect.left,
node.rect.bottom - node.rect.top);
node_data.relative_bounds.transform = std::make_unique<gfx::Transform>(
node.transform.scaleX, node.transform.skewX, node.transform.transX, 0,
node.transform.skewY, node.transform.scaleY, node.transform.transY, 0,
node.transform.pers0, node.transform.pers1, node.transform.pers2, 0, 0, 0,
0, 0);
for (auto child : node.children_in_traversal_order) {
node_data.child_ids.push_back(child);
}
SetTreeData(node, tree_update);
tree_update.nodes.push_back(node_data);
}
void AccessibilityBridge::SetRoleFromFlutterUpdate(ui::AXNodeData& node_data,
const SemanticsNode& node) {
FlutterSemanticsFlag flags = node.flags;
if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsButton) {
node_data.role = ax::mojom::Role::kButton;
return;
}
if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsTextField &&
!(flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsReadOnly)) {
node_data.role = ax::mojom::Role::kTextField;
return;
}
if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsHeader) {
node_data.role = ax::mojom::Role::kHeader;
return;
}
if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsImage) {
node_data.role = ax::mojom::Role::kImage;
return;
}
if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsLink) {
node_data.role = ax::mojom::Role::kLink;
return;
}
if (flags & kFlutterSemanticsFlagIsInMutuallyExclusiveGroup &&
flags & kFlutterSemanticsFlagHasCheckedState) {
node_data.role = ax::mojom::Role::kRadioButton;
return;
}
if (flags & kFlutterSemanticsFlagHasCheckedState) {
node_data.role = ax::mojom::Role::kCheckBox;
return;
}
if (flags & kFlutterSemanticsFlagHasToggledState) {
node_data.role = ax::mojom::Role::kToggleButton;
return;
}
if (flags & kFlutterSemanticsFlagIsSlider) {
node_data.role = ax::mojom::Role::kSlider;
return;
}
// If the state cannot be derived from the flutter flags, we fallback to group
// or static text.
if (node.children_in_traversal_order.empty()) {
node_data.role = ax::mojom::Role::kStaticText;
} else {
node_data.role = ax::mojom::Role::kGroup;
}
}
void AccessibilityBridge::SetStateFromFlutterUpdate(ui::AXNodeData& node_data,
const SemanticsNode& node) {
FlutterSemanticsFlag flags = node.flags;
FlutterSemanticsAction actions = node.actions;
if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagHasExpandedState &&
flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsExpanded) {
node_data.AddState(ax::mojom::State::kExpanded);
} else if (flags &
FlutterSemanticsFlag::kFlutterSemanticsFlagHasExpandedState) {
node_data.AddState(ax::mojom::State::kCollapsed);
}
if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsTextField &&
(flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsReadOnly) == 0) {
node_data.AddState(ax::mojom::State::kEditable);
}
if (node_data.role == ax::mojom::Role::kStaticText &&
(actions & kHasScrollingAction) == 0 && node.value.empty() &&
node.label.empty() && node.hint.empty()) {
node_data.AddState(ax::mojom::State::kIgnored);
} else {
// kFlutterSemanticsFlagIsFocusable means a keyboard focusable, it is
// different from semantics focusable.
// TODO(chunhtai): figure out whether something is not semantics focusable.
node_data.AddState(ax::mojom::State::kFocusable);
}
}
void AccessibilityBridge::SetActionsFromFlutterUpdate(
ui::AXNodeData& node_data,
const SemanticsNode& node) {
FlutterSemanticsAction actions = node.actions;
if (actions & FlutterSemanticsAction::kFlutterSemanticsActionTap) {
node_data.AddAction(ax::mojom::Action::kDoDefault);
}
if (actions & FlutterSemanticsAction::kFlutterSemanticsActionScrollLeft) {
node_data.AddAction(ax::mojom::Action::kScrollLeft);
}
if (actions & FlutterSemanticsAction::kFlutterSemanticsActionScrollRight) {
node_data.AddAction(ax::mojom::Action::kScrollRight);
}
if (actions & FlutterSemanticsAction::kFlutterSemanticsActionScrollUp) {
node_data.AddAction(ax::mojom::Action::kScrollUp);
}
if (actions & FlutterSemanticsAction::kFlutterSemanticsActionScrollDown) {
node_data.AddAction(ax::mojom::Action::kScrollDown);
}
if (actions & FlutterSemanticsAction::kFlutterSemanticsActionIncrease) {
node_data.AddAction(ax::mojom::Action::kIncrement);
}
if (actions & FlutterSemanticsAction::kFlutterSemanticsActionDecrease) {
node_data.AddAction(ax::mojom::Action::kDecrement);
}
// Every node has show on screen action.
node_data.AddAction(ax::mojom::Action::kScrollToMakeVisible);
if (actions & FlutterSemanticsAction::kFlutterSemanticsActionSetSelection) {
node_data.AddAction(ax::mojom::Action::kSetSelection);
}
if (actions & FlutterSemanticsAction::
kFlutterSemanticsActionDidGainAccessibilityFocus) {
node_data.AddAction(ax::mojom::Action::kSetAccessibilityFocus);
}
if (actions & FlutterSemanticsAction::
kFlutterSemanticsActionDidLoseAccessibilityFocus) {
node_data.AddAction(ax::mojom::Action::kClearAccessibilityFocus);
}
if (actions & FlutterSemanticsAction::kFlutterSemanticsActionCustomAction) {
node_data.AddAction(ax::mojom::Action::kCustomAction);
}
}
void AccessibilityBridge::SetBooleanAttributesFromFlutterUpdate(
ui::AXNodeData& node_data,
const SemanticsNode& node) {
FlutterSemanticsAction actions = node.actions;
FlutterSemanticsFlag flags = node.flags;
node_data.AddBoolAttribute(ax::mojom::BoolAttribute::kScrollable,
actions & kHasScrollingAction);
node_data.AddBoolAttribute(
ax::mojom::BoolAttribute::kClickable,
actions & FlutterSemanticsAction::kFlutterSemanticsActionTap);
// TODO(chunhtai): figure out if there is a node that does not clip overflow.
node_data.AddBoolAttribute(ax::mojom::BoolAttribute::kClipsChildren,
!node.children_in_traversal_order.empty());
node_data.AddBoolAttribute(
ax::mojom::BoolAttribute::kSelected,
flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsSelected);
node_data.AddBoolAttribute(
ax::mojom::BoolAttribute::kEditableRoot,
flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsTextField &&
(flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsReadOnly) == 0);
// Mark nodes as line breaking so that screen readers don't
// merge all consecutive objects into one.
// TODO(schectman): When should a node have this attribute set?
// https://github.com/flutter/flutter/issues/118184
node_data.AddBoolAttribute(ax::mojom::BoolAttribute::kIsLineBreakingObject,
true);
}
void AccessibilityBridge::SetIntAttributesFromFlutterUpdate(
ui::AXNodeData& node_data,
const SemanticsNode& node) {
FlutterSemanticsFlag flags = node.flags;
node_data.AddIntAttribute(ax::mojom::IntAttribute::kTextDirection,
node.text_direction);
int sel_start = node.text_selection_base;
int sel_end = node.text_selection_extent;
if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsTextField &&
(flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsReadOnly) == 0 &&
!node.value.empty()) {
// By default the text field selection should be at the end.
sel_start = sel_start == -1 ? node.value.length() : sel_start;
sel_end = sel_end == -1 ? node.value.length() : sel_end;
}
node_data.AddIntAttribute(ax::mojom::IntAttribute::kTextSelStart, sel_start);
node_data.AddIntAttribute(ax::mojom::IntAttribute::kTextSelEnd, sel_end);
if (node_data.role == ax::mojom::Role::kRadioButton ||
node_data.role == ax::mojom::Role::kCheckBox) {
node_data.AddIntAttribute(
ax::mojom::IntAttribute::kCheckedState,
static_cast<int32_t>(
flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsCheckStateMixed
? ax::mojom::CheckedState::kMixed
: flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsChecked
? ax::mojom::CheckedState::kTrue
: ax::mojom::CheckedState::kFalse));
} else if (node_data.role == ax::mojom::Role::kToggleButton) {
node_data.AddIntAttribute(
ax::mojom::IntAttribute::kCheckedState,
static_cast<int32_t>(
flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsToggled
? ax::mojom::CheckedState::kTrue
: ax::mojom::CheckedState::kFalse));
}
}
void AccessibilityBridge::SetIntListAttributesFromFlutterUpdate(
ui::AXNodeData& node_data,
const SemanticsNode& node) {
FlutterSemanticsAction actions = node.actions;
if (actions & FlutterSemanticsAction::kFlutterSemanticsActionCustomAction) {
std::vector<int32_t> custom_action_ids;
for (size_t i = 0; i < node.custom_accessibility_actions.size(); i++) {
custom_action_ids.push_back(node.custom_accessibility_actions[i]);
}
node_data.AddIntListAttribute(ax::mojom::IntListAttribute::kCustomActionIds,
custom_action_ids);
}
}
void AccessibilityBridge::SetStringListAttributesFromFlutterUpdate(
ui::AXNodeData& node_data,
const SemanticsNode& node) {
FlutterSemanticsAction actions = node.actions;
if (actions & FlutterSemanticsAction::kFlutterSemanticsActionCustomAction) {
std::vector<std::string> custom_action_description;
for (size_t i = 0; i < node.custom_accessibility_actions.size(); i++) {
auto iter = pending_semantics_custom_action_updates_.find(
node.custom_accessibility_actions[i]);
BASE_DCHECK(iter != pending_semantics_custom_action_updates_.end());
custom_action_description.push_back(iter->second.label);
}
node_data.AddStringListAttribute(
ax::mojom::StringListAttribute::kCustomActionDescriptions,
custom_action_description);
}
}
void AccessibilityBridge::SetNameFromFlutterUpdate(ui::AXNodeData& node_data,
const SemanticsNode& node) {
node_data.SetName(node.label);
}
void AccessibilityBridge::SetValueFromFlutterUpdate(ui::AXNodeData& node_data,
const SemanticsNode& node) {
node_data.SetValue(node.value);
}
void AccessibilityBridge::SetTooltipFromFlutterUpdate(
ui::AXNodeData& node_data,
const SemanticsNode& node) {
node_data.SetTooltip(node.tooltip);
}
void AccessibilityBridge::SetTreeData(const SemanticsNode& node,
ui::AXTreeUpdate& tree_update) {
FlutterSemanticsFlag flags = node.flags;
// Set selection of the focused node if:
// 1. this text field has a valid selection
// 2. this text field doesn't have a valid selection but had selection stored
// in the tree.
if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsTextField &&
flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsFocused) {
if (node.text_selection_base != -1) {
tree_update.tree_data.sel_anchor_object_id = node.id;
tree_update.tree_data.sel_anchor_offset = node.text_selection_base;
tree_update.tree_data.sel_focus_object_id = node.id;
tree_update.tree_data.sel_focus_offset = node.text_selection_extent;
tree_update.has_tree_data = true;
} else if (tree_update.tree_data.sel_anchor_object_id == node.id) {
tree_update.tree_data.sel_anchor_object_id = ui::AXNode::kInvalidAXID;
tree_update.tree_data.sel_anchor_offset = -1;
tree_update.tree_data.sel_focus_object_id = ui::AXNode::kInvalidAXID;
tree_update.tree_data.sel_focus_offset = -1;
tree_update.has_tree_data = true;
}
}
if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsFocused &&
tree_update.tree_data.focus_id != node.id) {
tree_update.tree_data.focus_id = node.id;
tree_update.has_tree_data = true;
} else if ((flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsFocused) ==
0 &&
tree_update.tree_data.focus_id == node.id) {
tree_update.tree_data.focus_id = ui::AXNode::kInvalidAXID;
tree_update.has_tree_data = true;
}
}
AccessibilityBridge::SemanticsNode
AccessibilityBridge::FromFlutterSemanticsNode(
const FlutterSemanticsNode2& flutter_node) {
SemanticsNode result;
result.id = flutter_node.id;
result.flags = flutter_node.flags;
result.actions = flutter_node.actions;
result.text_selection_base = flutter_node.text_selection_base;
result.text_selection_extent = flutter_node.text_selection_extent;
result.scroll_child_count = flutter_node.scroll_child_count;
result.scroll_index = flutter_node.scroll_index;
result.scroll_position = flutter_node.scroll_position;
result.scroll_extent_max = flutter_node.scroll_extent_max;
result.scroll_extent_min = flutter_node.scroll_extent_min;
result.elevation = flutter_node.elevation;
result.thickness = flutter_node.thickness;
if (flutter_node.label) {
result.label = std::string(flutter_node.label);
}
if (flutter_node.hint) {
result.hint = std::string(flutter_node.hint);
}
if (flutter_node.value) {
result.value = std::string(flutter_node.value);
}
if (flutter_node.increased_value) {
result.increased_value = std::string(flutter_node.increased_value);
}
if (flutter_node.decreased_value) {
result.decreased_value = std::string(flutter_node.decreased_value);
}
if (flutter_node.tooltip) {
result.tooltip = std::string(flutter_node.tooltip);
}
result.text_direction = flutter_node.text_direction;
result.rect = flutter_node.rect;
result.transform = flutter_node.transform;
if (flutter_node.child_count > 0) {
result.children_in_traversal_order = std::vector<int32_t>(
flutter_node.children_in_traversal_order,
flutter_node.children_in_traversal_order + flutter_node.child_count);
}
if (flutter_node.custom_accessibility_actions_count > 0) {
result.custom_accessibility_actions = std::vector<int32_t>(
flutter_node.custom_accessibility_actions,
flutter_node.custom_accessibility_actions +
flutter_node.custom_accessibility_actions_count);
}
return result;
}
AccessibilityBridge::SemanticsCustomAction
AccessibilityBridge::FromFlutterSemanticsCustomAction(
const FlutterSemanticsCustomAction2& flutter_custom_action) {
SemanticsCustomAction result;
result.id = flutter_custom_action.id;
result.override_action = flutter_custom_action.override_action;
if (flutter_custom_action.label) {
result.label = std::string(flutter_custom_action.label);
}
if (flutter_custom_action.hint) {
result.hint = std::string(flutter_custom_action.hint);
}
return result;
}
void AccessibilityBridge::SetLastFocusedId(AccessibilityNodeId node_id) {
if (last_focused_id_ != node_id) {
auto last_focused_child =
GetFlutterPlatformNodeDelegateFromID(last_focused_id_);
if (!last_focused_child.expired()) {
DispatchAccessibilityAction(
last_focused_id_,
FlutterSemanticsAction::
kFlutterSemanticsActionDidLoseAccessibilityFocus,
{});
}
last_focused_id_ = node_id;
}
}
AccessibilityNodeId AccessibilityBridge::GetLastFocusedId() {
return last_focused_id_;
}
gfx::NativeViewAccessible AccessibilityBridge::GetNativeAccessibleFromId(
AccessibilityNodeId id) {
auto platform_node_delegate = GetFlutterPlatformNodeDelegateFromID(id).lock();
if (!platform_node_delegate) {
return nullptr;
}
return platform_node_delegate->GetNativeViewAccessible();
}
gfx::RectF AccessibilityBridge::RelativeToGlobalBounds(const ui::AXNode* node,
bool& offscreen,
bool clip_bounds) {
return tree_->RelativeToTreeBounds(node, gfx::RectF(), &offscreen,
clip_bounds);
}
ui::AXNode* AccessibilityBridge::GetNodeFromTree(
ui::AXTreeID tree_id,
ui::AXNode::AXID node_id) const {
return GetNodeFromTree(node_id);
}
ui::AXNode* AccessibilityBridge::GetNodeFromTree(
ui::AXNode::AXID node_id) const {
return tree_->GetFromId(node_id);
}
ui::AXTreeID AccessibilityBridge::GetTreeID() const {
return tree_->GetAXTreeID();
}
ui::AXTreeID AccessibilityBridge::GetParentTreeID() const {
return ui::AXTreeIDUnknown();
}
ui::AXNode* AccessibilityBridge::GetRootAsAXNode() const {
return tree_->root();
}
ui::AXNode* AccessibilityBridge::GetParentNodeFromParentTreeAsAXNode() const {
return nullptr;
}
ui::AXTree* AccessibilityBridge::GetTree() const {
return tree_.get();
}
ui::AXPlatformNode* AccessibilityBridge::GetPlatformNodeFromTree(
const ui::AXNode::AXID node_id) const {
auto platform_delegate_weak = GetFlutterPlatformNodeDelegateFromID(node_id);
auto platform_delegate = platform_delegate_weak.lock();
if (!platform_delegate) {
return nullptr;
}
return platform_delegate->GetPlatformNode();
}
ui::AXPlatformNode* AccessibilityBridge::GetPlatformNodeFromTree(
const ui::AXNode& node) const {
return GetPlatformNodeFromTree(node.id());
}
ui::AXPlatformNodeDelegate* AccessibilityBridge::RootDelegate() const {
return GetFlutterPlatformNodeDelegateFromID(GetRootAsAXNode()->id())
.lock()
.get();
}
} // namespace flutter