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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "services/accessibility/android/auto_complete_handler.h"
#include "base/memory/raw_ptr.h"
#include "services/accessibility/android/accessibility_info_data_wrapper.h"
#include "services/accessibility/android/android_accessibility_util.h"
#include "services/accessibility/android/ax_tree_source_android.h"
#include "services/accessibility/android/public/mojom/accessibility_helper.mojom-forward.h"
#include "ui/accessibility/ax_enums.mojom.h"
#include "ui/accessibility/ax_node.h"
#include "ui/accessibility/ax_node_data.h"
#include "ui/accessibility/platform/ax_android_constants.h"
namespace {
// The list value aria-autocomplete property.
constexpr char kAutoCompleteListAttribute[] = "list";
bool IsAutoComplete(ax::android::mojom::AccessibilityNodeInfoData* node) {
if (!node || !node->string_properties) {
return false;
}
auto it = node->string_properties->find(
ax::android::mojom::AccessibilityStringProperty::CLASS_NAME);
if (it == node->string_properties->end()) {
return false;
}
return it->second == ui::kAXAutoCompleteTextViewClassname ||
it->second == ui::kAXMultiAutoCompleteTextViewClassname;
}
int32_t GetAnchorId(ax::android::mojom::AccessibilityWindowInfoData* window) {
if (!window) {
return ui::kInvalidAXNodeID;
}
int32_t id;
if (ax::android::GetProperty(
window->int_properties,
ax::android::mojom::AccessibilityWindowIntProperty::ANCHOR_NODE_ID,
&id)) {
return id;
}
return ui::kInvalidAXNodeID;
}
} // namespace
namespace ax::android {
AutoCompleteHandler::AutoCompleteHandler(const int32_t editable_node_id)
: anchored_node_id_(editable_node_id) {}
AutoCompleteHandler::~AutoCompleteHandler() = default;
// static
std::vector<AutoCompleteHandler::IdAndHandler>
AutoCompleteHandler::CreateIfNecessary(
AXTreeSourceAndroid* tree_source,
const mojom::AccessibilityEventData& event_data) {
if (event_data.event_type !=
mojom::AccessibilityEventType::WINDOW_CONTENT_CHANGED) {
return {};
}
std::vector<IdAndHandler> results;
// Check all updated nodes under the event source.
std::vector<raw_ptr<AccessibilityInfoDataWrapper, VectorExperimental>>
to_visit;
to_visit.push_back(tree_source->GetFromId(event_data.source_id));
while (!to_visit.empty()) {
AccessibilityInfoDataWrapper* node_ptr = to_visit.back();
to_visit.pop_back();
if (!node_ptr) {
continue;
}
const int32_t node_id = node_ptr->GetId();
if (IsAutoComplete(node_ptr->GetNode())) {
results.emplace_back(node_id,
std::make_unique<AutoCompleteHandler>(node_id));
}
node_ptr->GetChildren(&to_visit);
}
return results;
}
bool AutoCompleteHandler::PreDispatchEvent(
AXTreeSourceAndroid* tree_source,
const mojom::AccessibilityEventData& event_data) {
if (event_data.event_type == mojom::AccessibilityEventType::WINDOWS_CHANGED) {
// Check if a popup window anchoring the node exists.
// The first window is the main window. Look for other windows.
for (size_t i = 1; i < event_data.window_data->size(); ++i) {
if (GetAnchorId(event_data.window_data->at(i).get()) !=
anchored_node_id_) {
continue;
}
int32_t window_id = event_data.window_data->at(i)->window_id;
if (suggestion_window_id_ != window_id) {
// Anchoring window has changed.
suggestion_window_id_ = window_id;
return true;
} else {
// Nothing related changed. No need to update.
return false;
}
}
if (suggestion_window_id_.has_value()) {
// No popup window found. The window has disappeared.
suggestion_window_id_.reset();
selected_node_id_.reset();
return true;
}
return false;
} else if (event_data.event_type ==
mojom::AccessibilityEventType::VIEW_SELECTED) {
// VIEW_SELECTED event from the suggestion list is a user's selecting action
// in a candidate.
if (!suggestion_window_id_.has_value()) {
return false;
}
AccessibilityInfoDataWrapper* source_node =
tree_source->GetFromId(event_data.source_id);
if (!source_node || source_node->GetWindowId() != suggestion_window_id_) {
return false;
}
AccessibilityInfoDataWrapper* selected_node =
GetSelectedNodeInfoFromAdapterViewEvent(event_data, source_node);
if (!selected_node || selected_node->GetId() == selected_node_id_) {
return false;
}
selected_node_id_ = selected_node->GetId();
return true;
}
return false;
}
void AutoCompleteHandler::PostSerializeNode(ui::AXNodeData* out_data) const {
DCHECK_EQ(out_data->role, ax::mojom::Role::kTextField);
out_data->AddStringAttribute(ax::mojom::StringAttribute::kAutoComplete,
kAutoCompleteListAttribute);
if (suggestion_window_id_.has_value()) {
out_data->AddState(ax::mojom::State::kExpanded);
out_data->AddIntListAttribute(ax::mojom::IntListAttribute::kControlsIds,
{suggestion_window_id_.value()});
if (selected_node_id_.has_value()) {
out_data->AddIntAttribute(ax::mojom::IntAttribute::kActivedescendantId,
selected_node_id_.value());
}
} else {
out_data->AddState(ax::mojom::State::kCollapsed);
}
}
bool AutoCompleteHandler::ShouldDestroy(
AXTreeSourceAndroid* tree_source) const {
return tree_source->GetFromId(anchored_node_id_) == nullptr;
}
} // namespace ax::android
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