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// Copyright 2017 The Chromium 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 "ui/views/accessibility/view_accessibility.h"
#include "base/strings/utf_string_conversions.h"
#include "ui/base/ui_features.h"
#include "ui/views/view.h"
#include "ui/views/widget/widget.h"
namespace views {
namespace {
bool IsValidRoleForViews(ax::mojom::Role role) {
switch (role) {
// These roles all have special meaning and shouldn't ever be
// set on a View.
case ax::mojom::Role::kDesktop:
case ax::mojom::Role::kNone:
case ax::mojom::Role::kRootWebArea:
case ax::mojom::Role::kSvgRoot:
case ax::mojom::Role::kUnknown:
case ax::mojom::Role::kWebArea:
return false;
default:
return true;
}
}
} // namespace
#if !BUILDFLAG_INTERNAL_HAS_NATIVE_ACCESSIBILITY()
// static
std::unique_ptr<ViewAccessibility> ViewAccessibility::Create(View* view) {
return base::WrapUnique(new ViewAccessibility(view));
}
#endif
ViewAccessibility::ViewAccessibility(View* view)
: owner_view_(view), is_leaf_(false) {}
ViewAccessibility::~ViewAccessibility() {}
const ui::AXUniqueId& ViewAccessibility::GetUniqueId() const {
return unique_id_;
}
void ViewAccessibility::GetAccessibleNodeData(ui::AXNodeData* data) const {
// Views may misbehave if their widget is closed; return an unknown role
// rather than possibly crashing.
views::Widget* widget = owner_view_->GetWidget();
if (!widget || !widget->widget_delegate() || widget->IsClosed()) {
data->role = ax::mojom::Role::kUnknown;
data->SetRestriction(ax::mojom::Restriction::kDisabled);
return;
}
owner_view_->GetAccessibleNodeData(data);
if (custom_data_.role != ax::mojom::Role::kUnknown)
data->role = custom_data_.role;
if (custom_data_.HasStringAttribute(ax::mojom::StringAttribute::kName)) {
data->SetName(
custom_data_.GetStringAttribute(ax::mojom::StringAttribute::kName));
}
if (custom_data_.HasStringAttribute(
ax::mojom::StringAttribute::kDescription)) {
data->SetDescription(custom_data_.GetStringAttribute(
ax::mojom::StringAttribute::kDescription));
}
if (!data->HasStringAttribute(ax::mojom::StringAttribute::kDescription)) {
base::string16 tooltip;
owner_view_->GetTooltipText(gfx::Point(), &tooltip);
// Some screen readers announce the accessible description right after the
// accessible name. Only use the tooltip as the accessible description if
// it's different from the name, otherwise users might be puzzled as to why
// their screen reader is announcing the same thing twice.
if (tooltip !=
data->GetString16Attribute(ax::mojom::StringAttribute::kName)) {
data->AddStringAttribute(ax::mojom::StringAttribute::kDescription,
base::UTF16ToUTF8(tooltip));
}
}
data->location = gfx::RectF(owner_view_->GetBoundsInScreen());
data->AddStringAttribute(ax::mojom::StringAttribute::kClassName,
owner_view_->GetClassName());
if (owner_view_->IsAccessibilityFocusable())
data->AddState(ax::mojom::State::kFocusable);
if (!owner_view_->enabled())
data->SetRestriction(ax::mojom::Restriction::kDisabled);
if (!owner_view_->visible())
data->AddState(ax::mojom::State::kInvisible);
if (owner_view_->context_menu_controller())
data->AddAction(ax::mojom::Action::kShowContextMenu);
}
bool ViewAccessibility::IsLeaf() const {
return is_leaf_;
}
void ViewAccessibility::OverrideRole(ax::mojom::Role role) {
DCHECK(IsValidRoleForViews(role));
custom_data_.role = role;
}
void ViewAccessibility::OverrideName(const std::string& name) {
custom_data_.SetName(name);
}
void ViewAccessibility::OverrideName(const base::string16& name) {
custom_data_.SetName(base::UTF16ToUTF8(name));
}
void ViewAccessibility::OverrideDescription(const std::string& description) {
DCHECK(!custom_data_.HasStringAttribute(
ax::mojom::StringAttribute::kDescription));
custom_data_.AddStringAttribute(ax::mojom::StringAttribute::kDescription,
description);
}
void ViewAccessibility::OverrideIsLeaf() {
is_leaf_ = true;
}
gfx::NativeViewAccessible ViewAccessibility::GetNativeObject() {
return nullptr;
}
} // namespace views
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