flutter::AccessibilityBridge Class Reference

#include <accessibility_bridge.h>

Inheritance diagram for flutter::AccessibilityBridge:

Classes
class	IosDelegate

Public Member Functions
	AccessibilityBridge ()
	Creates a new instance of a accessibility bridge.
virtual	~AccessibilityBridge ()
void	AddFlutterSemanticsNodeUpdate (const FlutterSemanticsNode2 &node)
	Adds a semantics node update to the pending semantics update. Calling this method alone will NOT update the semantics tree. To flush the pending updates, call the CommitUpdates().
void	AddFlutterSemanticsCustomActionUpdate (const FlutterSemanticsCustomAction2 &action)
	Adds a custom semantics action update to the pending semantics update. Calling this method alone will NOT update the semantics tree. To flush the pending updates, call the CommitUpdates().
void	CommitUpdates ()
	Flushes the pending updates and applies them to this accessibility bridge. Calling this with no pending updates does nothing, and callers should call this method at the end of an atomic batch to avoid leaving the tree in a unstable state. For example if a node reparents from A to B, callers should only call this method when both removal from A and addition to B are in the pending updates.
std::weak_ptr< FlutterPlatformNodeDelegate >	GetFlutterPlatformNodeDelegateFromID (AccessibilityNodeId id) const
	Get the flutter platform node delegate with the given id from this accessibility bridge. Returns expired weak_ptr if the delegate associated with the id does not exist or has been removed from the accessibility tree.
const ui::AXTreeData &	GetAXTreeData () const
	Get the ax tree data from this accessibility bridge. The tree data contains information such as the id of the node that has the keyboard focus or the text selection range.
const std::vector< ui::AXEventGenerator::TargetedEvent >	GetPendingEvents () const
	Gets all pending accessibility events generated during semantics updates. This is useful when deciding how to handle events in AccessibilityBridgeDelegate::OnAccessibilityEvent in case one may decide to handle an event differently based on all pending events.
ui::AXNode *	GetNodeFromTree (const ui::AXTreeID tree_id, const ui::AXNode::AXID node_id) const override
ui::AXNode *	GetNodeFromTree (const ui::AXNode::AXID node_id) const override
ui::AXTreeID	GetTreeID () const override
ui::AXTreeID	GetParentTreeID () const override
ui::AXNode *	GetRootAsAXNode () const override
ui::AXNode *	GetParentNodeFromParentTreeAsAXNode () const override
ui::AXTree *	GetTree () const override
ui::AXPlatformNode *	GetPlatformNodeFromTree (const ui::AXNode::AXID node_id) const override
ui::AXPlatformNode *	GetPlatformNodeFromTree (const ui::AXNode &node) const override
ui::AXPlatformNodeDelegate *	RootDelegate () const override
	AccessibilityBridge (FlutterViewController *view_controller, PlatformViewIOS *platform_view, std::shared_ptr< FlutterPlatformViewsController > platform_views_controller, std::unique_ptr< IosDelegate > ios_delegate=nullptr)
	~AccessibilityBridge ()
void	UpdateSemantics (flutter::SemanticsNodeUpdates nodes, const flutter::CustomAccessibilityActionUpdates &actions)
void	HandleEvent (NSDictionary< NSString *, id > *annotatedEvent)
void	DispatchSemanticsAction (int32_t id, flutter::SemanticsAction action) override
void	DispatchSemanticsAction (int32_t id, flutter::SemanticsAction action, fml::MallocMapping args) override
void	AccessibilityObjectDidBecomeFocused (int32_t id) override
void	AccessibilityObjectDidLoseFocus (int32_t id) override
UIView< UITextInput > *	textInputView () override
UIView *	view () const override
bool	isVoiceOverRunning () const override
fml::WeakPtr< AccessibilityBridge >	GetWeakPtr ()
std::shared_ptr< FlutterPlatformViewsController >	GetPlatformViewsController () const override
void	clearState ()
Public Member Functions inherited from flutter::FlutterPlatformNodeDelegate::OwnerBridge
virtual	~OwnerBridge ()=default
Public Member Functions inherited from ui::AXPlatformTreeManager
virtual	~AXPlatformTreeManager ()=default
Public Member Functions inherited from ui::AXTreeManager
virtual	~AXTreeManager ()=default
Public Member Functions inherited from flutter::AccessibilityBridgeIos
virtual	~AccessibilityBridgeIos ()=default

Protected Member Functions
virtual void	OnAccessibilityEvent (ui::AXEventGenerator::TargetedEvent targeted_event)=0
	Handle accessibility events generated due to accessibility tree changes. These events are needed to be sent to native accessibility system. See ui::AXEventGenerator::Event for possible events.
virtual std::shared_ptr< FlutterPlatformNodeDelegate >	CreateFlutterPlatformNodeDelegate ()=0
	Creates a platform specific FlutterPlatformNodeDelegate. Ownership passes to the caller. This method will be called whenever a new AXNode is created in AXTree. Each platform needs to implement this method in order to inject its subclass into the accessibility bridge.
Protected Member Functions inherited from flutter::FlutterPlatformNodeDelegate::OwnerBridge
virtual void	DispatchAccessibilityAction (AccessibilityNodeId target, FlutterSemanticsAction action, fml::MallocMapping data)=0
	Dispatch accessibility action back to the Flutter framework. These actions are generated in the native accessibility system when users interact with the assistive technologies. For example, a FlutterSemanticsAction::kFlutterSemanticsActionTap is fired when user click or touch the screen.

Private Member Functions
void	OnNodeWillBeDeleted (ui::AXTree *tree, ui::AXNode *node) override
void	OnSubtreeWillBeDeleted (ui::AXTree *tree, ui::AXNode *node) override
void	OnNodeCreated (ui::AXTree *tree, ui::AXNode *node) override
void	OnNodeDeleted (ui::AXTree *tree, AccessibilityNodeId node_id) override
void	OnNodeReparented (ui::AXTree *tree, ui::AXNode *node) override
void	OnRoleChanged (ui::AXTree *tree, ui::AXNode *node, ax::mojom::Role old_role, ax::mojom::Role new_role) override
void	OnAtomicUpdateFinished (ui::AXTree *tree, bool root_changed, const std::vector< ui::AXTreeObserver::Change > &changes) override
void	SetLastFocusedId (AccessibilityNodeId node_id) override
	Update the id of the node that is currently foucsed by the native accessibility system.
AccessibilityNodeId	GetLastFocusedId () override
	Get the last id of the node that received accessibility focus.
gfx::NativeViewAccessible	GetNativeAccessibleFromId (AccessibilityNodeId id) override
	Get the native accessibility node with the given id.
gfx::RectF	RelativeToGlobalBounds (const ui::AXNode *node, bool &offscreen, bool clip_bounds) override
	Gets the rectangular bounds of the ax node relative to global coordinate.

Detailed Description

Use this class to maintain an accessibility tree. This class consumes semantics updates from the embedder API and produces an accessibility tree in the native format.

The bridge creates an AXTree to hold the semantics data that comes from Flutter semantics updates. The tree holds AXNode[s] which contain the semantics information for semantics node. The AXTree resemble the Flutter semantics tree in the Flutter framework. The bridge also uses FlutterPlatformNodeDelegate to wrap each AXNode in order to provide an accessibility tree in the native format.

To use this class, one must subclass this class and provide their own implementation of FlutterPlatformNodeDelegate.

AccessibilityBridge must be created as a shared_ptr, since some methods acquires its weak_ptr.

An accessibility instance is bound to one FlutterViewController and FlutterView instance.

It helps populate the UIView's accessibilityElements property from Flutter's semantics nodes.

Definition at line 40 of file accessibility_bridge.h.

Constructor & Destructor Documentation

AccessibilityBridge() [1/2]

flutter::AccessibilityBridge::AccessibilityBridge

(

)

Creates a new instance of a accessibility bridge.

Definition at line 23 of file accessibility_bridge.cc.

    : 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() [1/2]

flutter::AccessibilityBridge::~AccessibilityBridge ( )

virtual

Definition at line 34 of file accessibility_bridge.cc.

                                          {
  event_generator_.ReleaseTree();
  tree_->RemoveObserver(static_cast<ui::AXTreeObserver*>(this));
}

AccessibilityBridge() [2/2]

flutter::AccessibilityBridge::AccessibilityBridge	(	FlutterViewController *	view_controller,
		PlatformViewIOS *	platform_view,
		std::shared_ptr< FlutterPlatformViewsController >	platform_views_controller,
		std::unique_ptr< IosDelegate >	ios_delegate = nullptr
	)

~AccessibilityBridge() [2/2]

flutter::AccessibilityBridge::~AccessibilityBridge

(

)

Member Function Documentation

AccessibilityObjectDidBecomeFocused()

void flutter::AccessibilityBridge::AccessibilityObjectDidBecomeFocused ( int32_t  id )

overridevirtual

A callback that is called when a SemanticObject receives focus.

The input id is the uid of the newly focused SemanticObject.

Implements flutter::AccessibilityBridgeIos.

AccessibilityObjectDidLoseFocus()

void flutter::AccessibilityBridge::AccessibilityObjectDidLoseFocus ( int32_t  id )

overridevirtual

A callback that is called when a SemanticObject loses focus

The input id is the uid of the newly focused SemanticObject.

Implements flutter::AccessibilityBridgeIos.

AddFlutterSemanticsCustomActionUpdate()

void flutter::AccessibilityBridge::AddFlutterSemanticsCustomActionUpdate

(

const FlutterSemanticsCustomAction2 &

action

)

Adds a custom semantics action update to the pending semantics update. Calling this method alone will NOT update the semantics tree. To flush the pending updates, call the CommitUpdates().

Parameters

[in]

action

A reference to the custom semantics action update.

Definition at line 44 of file accessibility_bridge.cc.

                                                 {
  pending_semantics_custom_action_updates_[action.id] =
      FromFlutterSemanticsCustomAction(action);
}

AddFlutterSemanticsNodeUpdate()

void flutter::AccessibilityBridge::AddFlutterSemanticsNodeUpdate

(

const FlutterSemanticsNode2 &

node

)

Adds a semantics node update to the pending semantics update. Calling this method alone will NOT update the semantics tree. To flush the pending updates, call the CommitUpdates().

Parameters

[in]

node

A reference to the semantics node update.

Definition at line 39 of file accessibility_bridge.cc.

                                       {
  pending_semantics_node_updates_[node.id] = FromFlutterSemanticsNode(node);
}

clearState()

void flutter::AccessibilityBridge::clearState

(

)

CommitUpdates()

void flutter::AccessibilityBridge::CommitUpdates

(

)

Flushes the pending updates and applies them to this accessibility bridge. Calling this with no pending updates does nothing, and callers should call this method at the end of an atomic batch to avoid leaving the tree in a unstable state. For example if a node reparents from A to B, callers should only call this method when both removal from A and addition to B are in the pending updates.

Definition at line 50 of file accessibility_bridge.cc.

                                        {
  // 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 (const 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();
}

CreateFlutterPlatformNodeDelegate()

virtual std::shared_ptr< FlutterPlatformNodeDelegate > flutter::AccessibilityBridge::CreateFlutterPlatformNodeDelegate ( )

protectedpure virtual

Creates a platform specific FlutterPlatformNodeDelegate. Ownership passes to the caller. This method will be called whenever a new AXNode is created in AXTree. Each platform needs to implement this method in order to inject its subclass into the accessibility bridge.

Implemented in flutter::TestAccessibilityBridge, flutter::AccessibilityBridgeMac, and flutter::AccessibilityBridgeWindows.

DispatchSemanticsAction() [1/2]

void flutter::AccessibilityBridge::DispatchSemanticsAction ( int32_t  id, flutter::SemanticsAction  action  )

overridevirtual

Implements flutter::AccessibilityBridgeIos.

DispatchSemanticsAction() [2/2]

void flutter::AccessibilityBridge::DispatchSemanticsAction ( int32_t  id, flutter::SemanticsAction  action, fml::MallocMapping  args  )

overridevirtual

Implements flutter::AccessibilityBridgeIos.

GetAXTreeData()

const ui::AXTreeData & flutter::AccessibilityBridge::GetAXTreeData

(

)

const

Get the ax tree data from this accessibility bridge. The tree data contains information such as the id of the node that has the keyboard focus or the text selection range.

Definition at line 141 of file accessibility_bridge.cc.

                                                             {
  return tree_->data();
}

GetFlutterPlatformNodeDelegateFromID()

std::weak_ptr< FlutterPlatformNodeDelegate > flutter::AccessibilityBridge::GetFlutterPlatformNodeDelegateFromID

(

AccessibilityNodeId

id

)

const

Get the flutter platform node delegate with the given id from this accessibility bridge. Returns expired weak_ptr if the delegate associated with the id does not exist or has been removed from the accessibility tree.

Parameters

[in]

id

The id of the flutter accessibility node you want to retrieve.

Definition at line 131 of file accessibility_bridge.cc.

                                  {
  const auto iter = id_wrapper_map_.find(id);
  if (iter != id_wrapper_map_.end()) {
    return iter->second;
  }
 
  return std::weak_ptr<FlutterPlatformNodeDelegate>();
}

GetLastFocusedId()

AccessibilityNodeId flutter::AccessibilityBridge::GetLastFocusedId ( )

overrideprivatevirtual

Get the last id of the node that received accessibility focus.

Implements flutter::FlutterPlatformNodeDelegate::OwnerBridge.

Definition at line 655 of file accessibility_bridge.cc.

                                                          {
  return last_focused_id_;
}

GetNativeAccessibleFromId()

gfx::NativeViewAccessible flutter::AccessibilityBridge::GetNativeAccessibleFromId ( AccessibilityNodeId  id )

overrideprivatevirtual

Get the native accessibility node with the given id.

Parameters

[in]

id

The id of the native accessibility node you want to retrieve.

Implements flutter::FlutterPlatformNodeDelegate::OwnerBridge.

Definition at line 659 of file accessibility_bridge.cc.

                            {
  auto platform_node_delegate = GetFlutterPlatformNodeDelegateFromID(id).lock();
  if (!platform_node_delegate) {
    return nullptr;
  }
  return platform_node_delegate->GetNativeViewAccessible();
}

GetNodeFromTree() [1/2]

ui::AXNode * flutter::AccessibilityBridge::GetNodeFromTree ( const ui::AXNode::AXID  node_id ) const

overridevirtual

Implements ui::AXTreeManager.

Definition at line 681 of file accessibility_bridge.cc.

                                {
  return tree_->GetFromId(node_id);
}

GetNodeFromTree() [2/2]

ui::AXNode * flutter::AccessibilityBridge::GetNodeFromTree ( const ui::AXTreeID  tree_id, const ui::AXNode::AXID  node_id  ) const

overridevirtual

Implements ui::AXTreeManager.

Definition at line 675 of file accessibility_bridge.cc.

                                {
  return GetNodeFromTree(node_id);
}

GetParentNodeFromParentTreeAsAXNode()

ui::AXNode * flutter::AccessibilityBridge::GetParentNodeFromParentTreeAsAXNode ( ) const

overridevirtual

Implements ui::AXTreeManager.

Definition at line 698 of file accessibility_bridge.cc.

                                                                         {
  return nullptr;
}

GetParentTreeID()

ui::AXTreeID flutter::AccessibilityBridge::GetParentTreeID ( ) const

overridevirtual

Implements ui::AXTreeManager.

Definition at line 690 of file accessibility_bridge.cc.

                                                      {
  return ui::AXTreeIDUnknown();
}

GetPendingEvents()

const std::vector< ui::AXEventGenerator::TargetedEvent > flutter::AccessibilityBridge::GetPendingEvents

(

)

const

Gets all pending accessibility events generated during semantics updates. This is useful when deciding how to handle events in AccessibilityBridgeDelegate::OnAccessibilityEvent in case one may decide to handle an event differently based on all pending events.

Definition at line 146 of file accessibility_bridge.cc.

                                            {
  std::vector<ui::AXEventGenerator::TargetedEvent> result(
      event_generator_.begin(), event_generator_.end());
  return result;
}

GetPlatformNodeFromTree() [1/2]

ui::AXPlatformNode * flutter::AccessibilityBridge::GetPlatformNodeFromTree ( const ui::AXNode &  node ) const

overridevirtual

Implements ui::AXPlatformTreeManager.

Definition at line 716 of file accessibility_bridge.cc.

                                {
  return GetPlatformNodeFromTree(node.id());
}

GetPlatformNodeFromTree() [2/2]

ui::AXPlatformNode * flutter::AccessibilityBridge::GetPlatformNodeFromTree ( const ui::AXNode::AXID  node_id ) const

overridevirtual

Implements ui::AXPlatformTreeManager.

Definition at line 706 of file accessibility_bridge.cc.

                                      {
  auto platform_delegate_weak = GetFlutterPlatformNodeDelegateFromID(node_id);
  auto platform_delegate = platform_delegate_weak.lock();
  if (!platform_delegate) {
    return nullptr;
  }
  return platform_delegate->GetPlatformNode();
}

GetPlatformViewsController()

std::shared_ptr< FlutterPlatformViewsController > flutter::AccessibilityBridge::GetPlatformViewsController ( ) const

inlineoverridevirtual

Implements flutter::AccessibilityBridgeIos.

Definition at line 76 of file accessibility_bridge.h.

                                                                                            {
    return platform_views_controller_;
  };

GetRootAsAXNode()

ui::AXNode * flutter::AccessibilityBridge::GetRootAsAXNode ( ) const

overridevirtual

Implements ui::AXTreeManager.

Definition at line 694 of file accessibility_bridge.cc.

                                                     {
  return tree_->root();
}

GetTree()

ui::AXTree * flutter::AccessibilityBridge::GetTree ( ) const

overridevirtual

Implements ui::AXTreeManager.

Definition at line 702 of file accessibility_bridge.cc.

                                             {
  return tree_.get();
}

GetTreeID()

ui::AXTreeID flutter::AccessibilityBridge::GetTreeID ( ) const

overridevirtual

Implements ui::AXTreeManager.

Definition at line 686 of file accessibility_bridge.cc.

                                                {
  return tree_->GetAXTreeID();
}

GetWeakPtr()

fml::WeakPtr< AccessibilityBridge > flutter::AccessibilityBridge::GetWeakPtr

(

)

HandleEvent()

void flutter::AccessibilityBridge::HandleEvent

(

NSDictionary< NSString *, id > *

annotatedEvent

)

isVoiceOverRunning()

bool flutter::AccessibilityBridge::isVoiceOverRunning ( ) const

inlineoverridevirtual

Implements flutter::AccessibilityBridgeIos.

Definition at line 72 of file accessibility_bridge.h.

{ return view_controller_.isVoiceOverRunning; }

OnAccessibilityEvent()

virtual void flutter::AccessibilityBridge::OnAccessibilityEvent ( ui::AXEventGenerator::TargetedEvent  targeted_event )

protectedpure virtual

Handle accessibility events generated due to accessibility tree changes. These events are needed to be sent to native accessibility system. See ui::AXEventGenerator::Event for possible events.

Parameters

[in]

targeted_event

The object that contains both the generated event and the event target.

Implemented in flutter::TestAccessibilityBridge, flutter::AccessibilityBridgeMac, and flutter::AccessibilityBridgeWindows.

OnAtomicUpdateFinished()

void flutter::AccessibilityBridge::OnAtomicUpdateFinished ( ui::AXTree *  tree, bool  root_changed, const std::vector< ui::AXTreeObserver::Change > &  changes  )

overrideprivatevirtual

Reimplemented from ui::AXTreeObserver.

Definition at line 183 of file accessibility_bridge.cc.

                                                      {
  // 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());
  }
}

OnNodeCreated()

void flutter::AccessibilityBridge::OnNodeCreated ( ui::AXTree *  tree, ui::AXNode *  node  )

overrideprivatevirtual

Reimplemented from ui::AXTreeObserver.

Definition at line 166 of file accessibility_bridge.cc.

                                                                      {
  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);
}

OnNodeDeleted()

void flutter::AccessibilityBridge::OnNodeDeleted ( ui::AXTree *  tree, AccessibilityNodeId  node_id  )

overrideprivatevirtual

Reimplemented from ui::AXTreeObserver.

Definition at line 175 of file accessibility_bridge.cc.

                                                                     {
  BASE_DCHECK(node_id != ui::AXNode::kInvalidAXID);
  if (id_wrapper_map_.find(node_id) != id_wrapper_map_.end()) {
    id_wrapper_map_.erase(node_id);
  }
}

OnNodeReparented()

void flutter::AccessibilityBridge::OnNodeReparented ( ui::AXTree *  tree, ui::AXNode *  node  )

overrideprivatevirtual

Reimplemented from ui::AXTreeObserver.

Definition at line 158 of file accessibility_bridge.cc.

                                                                         {
}

OnNodeWillBeDeleted()

void flutter::AccessibilityBridge::OnNodeWillBeDeleted ( ui::AXTree *  tree, ui::AXNode *  node  )

overrideprivatevirtual

Reimplemented from ui::AXTreeObserver.

Definition at line 152 of file accessibility_bridge.cc.

                                                              {}

OnRoleChanged()

void flutter::AccessibilityBridge::OnRoleChanged ( ui::AXTree *  tree, ui::AXNode *  node, ax::mojom::Role  old_role, ax::mojom::Role  new_role  )

overrideprivatevirtual

Reimplemented from ui::AXTreeObserver.

Definition at line 161 of file accessibility_bridge.cc.

                                                              {}

OnSubtreeWillBeDeleted()

void flutter::AccessibilityBridge::OnSubtreeWillBeDeleted ( ui::AXTree *  tree, ui::AXNode *  node  )

overrideprivatevirtual

Reimplemented from ui::AXTreeObserver.

Definition at line 155 of file accessibility_bridge.cc.

                                                                 {}

RelativeToGlobalBounds()

gfx::RectF flutter::AccessibilityBridge::RelativeToGlobalBounds ( const ui::AXNode *  node, bool &  offscreen, bool  clip_bounds  )

overrideprivatevirtual

Gets the rectangular bounds of the ax node relative to global coordinate.

Parameters

[in]	node	The ax node to look up.
[in]	offscreen	the bool reference to hold the result whether the ax node is outside of its ancestors' bounds.
[in]	clip_bounds	whether to clip the result if the ax node cannot be fully contained in its ancestors' bounds.

Implements flutter::FlutterPlatformNodeDelegate::OwnerBridge.

Definition at line 668 of file accessibility_bridge.cc.

                                                                         {
  return tree_->RelativeToTreeBounds(node, gfx::RectF(), &offscreen,
                                     clip_bounds);
}

RootDelegate()

ui::AXPlatformNodeDelegate * flutter::AccessibilityBridge::RootDelegate ( ) const

overridevirtual

Implements ui::AXPlatformTreeManager.

Definition at line 721 of file accessibility_bridge.cc.

                                                                  {
  return GetFlutterPlatformNodeDelegateFromID(GetRootAsAXNode()->id())
      .lock()
      .get();
}

SetLastFocusedId()

void flutter::AccessibilityBridge::SetLastFocusedId ( AccessibilityNodeId  node_id )

overrideprivatevirtual

Update the id of the node that is currently foucsed by the native accessibility system.

Parameters

[in]

node_id

The id of the focused node.

Implements flutter::FlutterPlatformNodeDelegate::OwnerBridge.

Definition at line 640 of file accessibility_bridge.cc.

                                                                      {
  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;
  }
}

textInputView()

UIView< UITextInput > * flutter::AccessibilityBridge::textInputView ( )

overridevirtual

Implements flutter::AccessibilityBridgeIos.

UpdateSemantics()

void flutter::AccessibilityBridge::UpdateSemantics	(	flutter::SemanticsNodeUpdates	nodes,
		const flutter::CustomAccessibilityActionUpdates &	actions
	)

view()

UIView * flutter::AccessibilityBridge::view ( ) const

inlineoverridevirtual

Implements flutter::AccessibilityBridgeIos.

Definition at line 70 of file accessibility_bridge.h.

{ return view_controller_.view; }

---

The documentation for this class was generated from the following files:

• shell/platform/common/accessibility_bridge.h
• shell/platform/darwin/ios/framework/Source/accessibility_bridge.h
• shell/platform/common/accessibility_bridge.cc