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// Copyright 2014 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_mac.h"
#include "base/apple/foundation_util.h"
#include "base/strings/sys_string_conversions.h"
#include "ui/accessibility/platform/ax_platform_node_cocoa.h"
namespace {
using RoleMap = std::map<ax::mojom::Role, NSString*>;
using EventMap = std::map<ax::mojom::Event, NSString*>;
using ActionList = std::vector<std::pair<ax::mojom::Action, NSString*>>;
void PostAnnouncementNotification(NSString* announcement,
NSWindow* window,
bool is_polite) {
NSAccessibilityPriorityLevel priority =
is_polite ? NSAccessibilityPriorityMedium : NSAccessibilityPriorityHigh;
NSDictionary* notification_info = @{
NSAccessibilityAnnouncementKey : announcement,
NSAccessibilityPriorityKey : @(priority)
};
// On Mojave, announcements from an inactive window aren't spoken.
NSAccessibilityPostNotificationWithUserInfo(
window, NSAccessibilityAnnouncementRequestedNotification,
notification_info);
}
void NotifyMacEvent(AXPlatformNodeCocoa* target, ax::mojom::Event event_type) {
if (![target AXWindow]) {
// A child tree is not attached to the window. Return early, otherwise
// AppKit will hang trying to reach the root, resulting in a bug where
// VoiceOver keeps repeating "[appname] is not responding".
return;
}
NSString* notification =
[AXPlatformNodeCocoa nativeNotificationFromAXEvent:event_type];
if (notification)
NSAccessibilityPostNotification(target, notification);
}
} // namespace
namespace ui {
// static
AXPlatformNode::Pointer AXPlatformNode::Create(
AXPlatformNodeDelegate& delegate) {
AXPlatformNode* node = new AXPlatformNodeMac();
node->Init(delegate);
return Pointer(node);
}
// static
AXPlatformNode* AXPlatformNode::FromNativeViewAccessible(
gfx::NativeViewAccessible accessible) {
AXPlatformNodeCocoa* node_cocoa =
base::apple::ObjCCast<AXPlatformNodeCocoa>(accessible.Get());
if (node_cocoa) {
return [node_cocoa node];
}
return nullptr;
}
struct AXPlatformNodeMac::ObjCStorage {
AXPlatformNodeCocoa* __strong native_node;
};
AXPlatformNodeMac::AXPlatformNodeMac()
: objc_storage_(std::make_unique<ObjCStorage>()) {}
AXPlatformNodeMac::~AXPlatformNodeMac() = default;
void AXPlatformNodeMac::Destroy() {
if (objc_storage_->native_node) {
[objc_storage_->native_node detachAndNotifyDestroyed:YES];
// Also, clear the pointer to make accidental use-after-free impossible.
objc_storage_->native_node = nil;
}
AXPlatformNodeBase::Destroy();
}
// On Mac, the checked state is mapped to AXValue.
bool AXPlatformNodeMac::IsPlatformCheckable() const {
if (GetRole() == ax::mojom::Role::kTab) {
// On Mac, tabs are exposed as radio buttons, and are treated as checkable.
// Also, the internal State::kSelected is be mapped to checked via AXValue.
return true;
}
return AXPlatformNodeBase::IsPlatformCheckable();
}
AXPlatformNodeCocoa* AXPlatformNodeMac::GetNativeWrapper() const {
return objc_storage_->native_node;
}
AXPlatformNodeCocoa* AXPlatformNodeMac::ReleaseNativeWrapper() {
AXPlatformNodeCocoa* native_node = objc_storage_->native_node;
objc_storage_->native_node = nil;
return native_node;
}
void AXPlatformNodeMac::SetNativeWrapper(AXPlatformNodeCocoa* native_node) {
objc_storage_->native_node = native_node;
}
gfx::NativeViewAccessible AXPlatformNodeMac::GetNativeViewAccessible() {
if (!objc_storage_->native_node) {
objc_storage_->native_node =
[[AXPlatformNodeCocoa alloc] initWithNode:this];
}
return gfx::NativeViewAccessible(objc_storage_->native_node);
}
void AXPlatformNodeMac::NotifyAccessibilityEvent(ax::mojom::Event event_type) {
AXPlatformNodeBase::NotifyAccessibilityEvent(event_type);
GetNativeViewAccessible();
// Handle special cases.
// Alerts and live regions go through the announcement API instead of the
// regular NSAccessibility notification system.
if (event_type == ax::mojom::Event::kAlert ||
event_type == ax::mojom::Event::kLiveRegionChanged) {
if (AXAnnouncementSpec* announcement =
[objc_storage_->native_node announcementForEvent:event_type]) {
[objc_storage_->native_node scheduleLiveRegionAnnouncement:announcement];
}
return;
}
if (event_type == ax::mojom::Event::kSelection) {
ax::mojom::Role role = GetRole();
if (IsMenuItem(role)) {
// On Mac, map menu item selection to a focus event.
NotifyMacEvent(objc_storage_->native_node, ax::mojom::Event::kFocus);
return;
} else if (IsListItem(role)) {
if (const AXPlatformNodeBase* container = GetSelectionContainer()) {
if (container->GetRole() == ax::mojom::Role::kListBox &&
!container->HasState(ax::mojom::State::kMultiselectable) &&
GetDelegate()->GetFocus() == GetNativeViewAccessible()) {
NotifyMacEvent(objc_storage_->native_node, ax::mojom::Event::kFocus);
return;
}
}
}
}
// Otherwise, use mappings between ax::mojom::Event and NSAccessibility
// notifications from the EventMap above.
NotifyMacEvent(objc_storage_->native_node, event_type);
}
void AXPlatformNodeMac::AnnounceTextAs(const std::u16string& text,
AnnouncementType announcement_type) {
PostAnnouncementNotification(base::SysUTF16ToNSString(text),
[objc_storage_->native_node AXWindow],
announcement_type == AnnouncementType::kPolite);
}
bool IsNameExposedInAXValueForRole(ax::mojom::Role role) {
switch (role) {
case ax::mojom::Role::kListBoxOption:
case ax::mojom::Role::kListMarker:
case ax::mojom::Role::kMenuListOption:
case ax::mojom::Role::kStaticText:
case ax::mojom::Role::kTitleBar:
return true;
default:
return false;
}
}
void AXPlatformNodeMac::AddAttributeToList(const char* name,
const char* value,
PlatformAttributeList* attributes) {
NOTREACHED();
}
} // namespace ui
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