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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "ui/accessibility/platform/ax_platform_node_ui_kit_element.h"
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#include <string>
#include "base/apple/foundation_util.h"
#include "base/auto_reset.h"
#import "base/memory/raw_ptr.h"
#import "base/strings/sys_string_conversions.h"
#import "ui/accessibility/ax_common.h"
#import "ui/accessibility/ax_enum_util.h"
#import "ui/accessibility/ax_enums.mojom.h"
#import "ui/accessibility/ax_role_properties.h"
#import "ui/accessibility/platform/ax_platform_node_ios.h"
#import "ui/accessibility/platform/ax_platform_tree_manager_delegate.h"
#import "ui/accessibility/platform/child_iterator_base.h"
#include "ui/gfx/native_widget_types.h"
@implementation AXPlatformNodeUIKitElement {
// The AXPlatformNode corresponding to this wrapper instance.
raw_ptr<ui::AXPlatformNodeIOS> _node;
// An array of children of this object. Cached to avoid re-computing.
NSMutableArray* _children;
// Whether the children have changed and need to be updated.
BOOL _needsToUpdateChildren;
// Whether _children is currently being computed.
BOOL _gettingChildren;
}
+ (AXPlatformNodeUIKitElement*)elementFromNativeViewAccessible:
(gfx::NativeViewAccessible)nativeViewAccessible {
return base::apple::ObjCCast<AXPlatformNodeUIKitElement>(
nativeViewAccessible.Get());
}
- (instancetype)initWithPlatformNode:(ui::AXPlatformNodeIOS*)platformNode {
id container = platformNode->GetParent().Get();
// TODO(crbug.com/336611337): Sometimes container is null for new subframes.
// We need a way to retry after the AXTreeManager is connected to its parent.
if (!container) {
return nil;
}
if ((self = [super initWithAccessibilityContainer:container])) {
_node = platformNode;
_needsToUpdateChildren = YES;
_gettingChildren = NO;
}
return self;
}
- (void)childrenChanged {
if (!_node || _gettingChildren) {
return;
}
_needsToUpdateChildren = YES;
if (![self isIncludedInPlatformTree]) {
ui::AXPlatformNode* parentNode =
ui::AXPlatformNode::FromNativeViewAccessible(_node->GetParent());
if (parentNode) {
[[AXPlatformNodeUIKitElement
elementFromNativeViewAccessible:parentNode->GetNativeViewAccessible()]
childrenChanged];
}
}
}
#pragma mark - AXPlatformNodeUIKit
- (void)detach {
_node = nullptr;
}
- (ui::AXPlatformNodeIOS*)node {
return _node.get();
}
#pragma mark - UIAccessibilityContainer
- (NSArray*)accessibilityElements {
if (!_node) {
return nil;
}
if (_needsToUpdateChildren) {
base::AutoReset<BOOL> setGettingChildren(&_gettingChildren, YES);
uint32_t childCount = _node->GetChildCount();
_children = [[NSMutableArray alloc] initWithCapacity:childCount];
for (auto it = _node->GetDelegate()->ChildrenBegin();
*it != *_node->GetDelegate()->ChildrenEnd(); ++(*it)) {
AXPlatformNodeUIKitElement* child = [AXPlatformNodeUIKitElement
elementFromNativeViewAccessible:it->GetNativeViewAccessible()];
if ([child isIncludedInPlatformTree]) {
[_children addObject:child];
} else {
[_children addObjectsFromArray:child.accessibilityElements];
}
}
// Also, add indirect children (if any).
const std::vector<int32_t>& indirectChildIds = _node->GetIntListAttribute(
ax::mojom::IntListAttribute::kIndirectChildIds);
for (int32_t childId : indirectChildIds) {
ui::AXPlatformNode* childNode =
_node->GetDelegate()->GetFromNodeID(childId);
if (childNode) {
[_children addObject:childNode->GetNativeViewAccessible().Get()];
}
}
_needsToUpdateChildren = NO;
}
return _children;
}
#pragma mark - UIAccessibility
- (UIAccessibilityTraits)accessibilityTraits {
// TODO(crbug.com/336611337): Choose appropriate traits based on node's role.
return UIAccessibilityTraitLink;
}
- (CGRect)accessibilityFrame {
if (!_node) {
return CGRectZero;
}
gfx::Rect rect = _node->GetDelegate()->GetBoundsRect(
ui::AXCoordinateSystem::kScreenDIPs, ui::AXClippingBehavior::kClipped);
rect = ScaleToRoundedRect(
rect, 1.f / _node->GetIOSDelegate()->GetDeviceScaleFactor());
return rect.ToCGRect();
}
- (id)accessibilityFocusedUIElement {
if (!_node) {
return nil;
}
return _node->GetFocus().Get();
}
- (BOOL)isAccessibilityElement {
if (!_node) {
return NO;
}
if (_node->GetRole() == ax::mojom::Role::kImage &&
_node->GetNameFrom() == ax::mojom::NameFrom::kAttributeExplicitlyEmpty) {
return NO;
}
// TODO(crbug.com/336611337): If a node is an accessibility element, then
// VoiceOver will not visit its accessibilityElements (that is, its children).
// If we ever need both a node and its descendants to be interactable using
// VoiceOver, we will need to restructure the UIAccessibility tree by
// inserting an additional node to act as a container.
if (self.accessibilityElements.count) {
return NO;
}
return (_node->GetRole() != ax::mojom::Role::kUnknown &&
!_node->GetDelegate()->IsIgnored());
}
- (NSString*)accessibilityLabel {
if (!_node) {
return nil;
}
std::string name = _node->GetName();
if (!name.empty()) {
return base::SysUTF8ToNSString(name);
}
// Given an image where there's no other title, return the base part
// of the filename as the description.
if ([self isImage]) {
std::string url;
if (_node->GetStringAttribute(ax::mojom::StringAttribute::kUrl, &url)) {
// Given a url like http://foo.com/bar/baz.png, just return the
// base name, e.g., "baz.png".
size_t leftIndex = url.rfind('/');
std::string basename =
leftIndex != std::string::npos ? url.substr(leftIndex) : url;
return base::SysUTF8ToNSString(basename);
}
}
return @"";
}
#pragma mark - UIAccessibilityAction
- (NSArray<UIAccessibilityCustomAction*>*)accessibilityCustomActions {
// TODO(crbug.com/336611337): Wire up custom actions for each node, like
// being able to tap or otherwise interact.
return nil;
}
#pragma mark - Private
- (BOOL)isIncludedInPlatformTree {
return _node && _node->GetRole() != ax::mojom::Role::kUnknown &&
!_node->IsInvisibleOrIgnored();
}
- (BOOL)isImage {
return ui::IsImage(_node->GetRole()) &&
!_node->GetBoolAttribute(
ax::mojom::BoolAttribute::kCanvasHasFallback) &&
!_node->GetChildCount() &&
_node->GetNameFrom() != ax::mojom::NameFrom::kAttributeExplicitlyEmpty;
}
@end
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