| Flutter Windows Embedder |

accessibility_bridge_windows_unittests.cc
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "flutter/shell/platform/windows/accessibility_bridge_windows.h"
6
7 #include <comdef.h>
8 #include <comutil.h>
9 #include <oleacc.h>
10
11 #include <vector>
12
13 #include "flutter/fml/macros.h"
14 #include "flutter/shell/platform/embedder/embedder.h"
15 #include "flutter/shell/platform/embedder/test_utils/proc_table_replacement.h"
16 #include "flutter/shell/platform/windows/flutter_platform_node_delegate_windows.h"
17 #include "flutter/shell/platform/windows/flutter_windows_engine.h"
18 #include "flutter/shell/platform/windows/flutter_windows_view.h"
19 #include "flutter/shell/platform/windows/testing/engine_modifier.h"
20 #include "flutter/shell/platform/windows/testing/mock_window_binding_handler.h"
21 #include "flutter/shell/platform/windows/testing/test_keyboard.h"
22 #include "gmock/gmock.h"
23 #include "gtest/gtest.h"
24
25 namespace flutter {
26 namespace testing {
27
28 namespace {
29 using ::testing::NiceMock;
30
31 // A structure representing a Win32 MSAA event targeting a specified node.
32 struct MsaaEvent {
33 std::shared_ptr<FlutterPlatformNodeDelegateWindows> node_delegate;
34 ax::mojom::Event event_type;
35 };
36
37 // Accessibility bridge delegate that captures events dispatched to the OS.
38 class AccessibilityBridgeWindowsSpy : public AccessibilityBridgeWindows {
39 public:
40 using AccessibilityBridgeWindows::OnAccessibilityEvent;
41
42 explicit AccessibilityBridgeWindowsSpy(FlutterWindowsEngine* engine,
43 FlutterWindowsView* view)
44 : AccessibilityBridgeWindows(view) {}
45
46 void DispatchWinAccessibilityEvent(
47 std::shared_ptr<FlutterPlatformNodeDelegateWindows> node_delegate,
48 ax::mojom::Event event_type) override {
49 dispatched_events_.push_back({node_delegate, event_type});
50 }
51
52 void SetFocus(std::shared_ptr<FlutterPlatformNodeDelegateWindows>
53 node_delegate) override {
54 focused_nodes_.push_back(std::move(node_delegate));
55 }
56
57 void ResetRecords() {
58 dispatched_events_.clear();
59 focused_nodes_.clear();
60 }
61
62 const std::vector<MsaaEvent>& dispatched_events() const {
63 return dispatched_events_;
64 }
65
66 const std::vector<int32_t> focused_nodes() const {
67 std::vector<int32_t> ids;
68 std::transform(focused_nodes_.begin(), focused_nodes_.end(),
69 std::back_inserter(ids),
70 [](std::shared_ptr<FlutterPlatformNodeDelegate> node) {
71 return node->GetAXNode()->id();
72 });
73 return ids;
74 }
75
76 protected:
77 std::weak_ptr<FlutterPlatformNodeDelegate> GetFocusedNode() override {
78 return focused_nodes_.back();
79 }
80
81 private:
82 std::vector<MsaaEvent> dispatched_events_;
83 std::vector<std::shared_ptr<FlutterPlatformNodeDelegate>> focused_nodes_;
84
85 FML_DISALLOW_COPY_AND_ASSIGN(AccessibilityBridgeWindowsSpy);
86 };
87
88 // A FlutterWindowsView whose accessibility bridge is an
89 // AccessibilityBridgeWindowsSpy.
90 class FlutterWindowsViewSpy : public FlutterWindowsView {
91 public:
92 FlutterWindowsViewSpy(FlutterWindowsEngine* engine,
93 std::unique_ptr<WindowBindingHandler> handler)
94 : FlutterWindowsView(kImplicitViewId, engine, std::move(handler)) {}
95
96 protected:
97 virtual std::shared_ptr<AccessibilityBridgeWindows>
98 CreateAccessibilityBridge() override {
99 return std::make_shared<AccessibilityBridgeWindowsSpy>(GetEngine(), this);
100 }
101
102 private:
103 FML_DISALLOW_COPY_AND_ASSIGN(FlutterWindowsViewSpy);
104 };
105
106 // Returns an engine instance configured with dummy project path values, and
107 // overridden methods for sending platform messages, so that the engine can
108 // respond as if the framework were connected.
109 std::unique_ptr<FlutterWindowsEngine> GetTestEngine() {
110 FlutterDesktopEngineProperties properties = {};
111 properties.assets_path = L"C:\\foo\\flutter_assets";
112 properties.icu_data_path = L"C:\\foo\\icudtl.dat";
113 properties.aot_library_path = L"C:\\foo\\aot.so";
114 FlutterProjectBundle project(properties);
115 auto engine = std::make_unique<FlutterWindowsEngine>(project);
116
117 EngineModifier modifier(engine.get());
118 modifier.embedder_api().UpdateSemanticsEnabled =
119 [](FLUTTER_API_SYMBOL(FlutterEngine) engine, bool enabled) {
120 return kSuccess;
121 };
122
123 MockEmbedderApiForKeyboard(modifier,
124 std::make_shared<MockKeyResponseController>());
125
126 engine->Run();
127 return engine;
128 }
129
130 // Populates the AXTree associated with the specified bridge with test data.
131 //
132 // node0
133 // / \
134 // node1 node2
135 // / \
136 // node3 node4
137 //
138 // node0 and node2 are grouping nodes. node1 and node2 are static text nodes.
139 // node4 is a static text node with no text, and hence has the "ignored" state.
140 void PopulateAXTree(std::shared_ptr<AccessibilityBridge> bridge) {
141 // Add node 0: root.
142 FlutterSemanticsNode2 node0{sizeof(FlutterSemanticsNode2), 0};
143 std::vector<int32_t> node0_children{1, 2};
144 node0.child_count = node0_children.size();
145 node0.children_in_traversal_order = node0_children.data();
146 node0.children_in_hit_test_order = node0_children.data();
147
148 // Add node 1: text child of node 0.
149 FlutterSemanticsNode2 node1{sizeof(FlutterSemanticsNode2), 1};
150 node1.label = "prefecture";
151 node1.value = "Kyoto";
152
153 // Add node 2: subtree child of node 0.
154 FlutterSemanticsNode2 node2{sizeof(FlutterSemanticsNode2), 2};
155 std::vector<int32_t> node2_children{3, 4};
156 node2.child_count = node2_children.size();
157 node2.children_in_traversal_order = node2_children.data();
158 node2.children_in_hit_test_order = node2_children.data();
159
160 // Add node 3: text child of node 2.
161 FlutterSemanticsNode2 node3{sizeof(FlutterSemanticsNode2), 3};
162 node3.label = "city";
163 node3.value = "Uji";
164
165 // Add node 4: text child (with no text) of node 2.
166 FlutterSemanticsNode2 node4{sizeof(FlutterSemanticsNode2), 4};
167
168 bridge->AddFlutterSemanticsNodeUpdate(node0);
169 bridge->AddFlutterSemanticsNodeUpdate(node1);
170 bridge->AddFlutterSemanticsNodeUpdate(node2);
171 bridge->AddFlutterSemanticsNodeUpdate(node3);
172 bridge->AddFlutterSemanticsNodeUpdate(node4);
173 bridge->CommitUpdates();
174 }
175
176 ui::AXNode* AXNodeFromID(std::shared_ptr<AccessibilityBridge> bridge,
177 int32_t id) {
178 auto node_delegate = bridge->GetFlutterPlatformNodeDelegateFromID(id).lock();
179 return node_delegate ? node_delegate->GetAXNode() : nullptr;
180 }
181
182 std::shared_ptr<AccessibilityBridgeWindowsSpy> GetAccessibilityBridgeSpy(
183 FlutterWindowsView& view) {
184 return std::static_pointer_cast<AccessibilityBridgeWindowsSpy>(
185 view.accessibility_bridge().lock());
186 }
187
188 void ExpectWinEventFromAXEvent(int32_t node_id,
189 ui::AXEventGenerator::Event ax_event,
190 ax::mojom::Event expected_event) {
191 auto engine = GetTestEngine();
192 FlutterWindowsViewSpy view{
193 engine.get(), std::make_unique<NiceMock<MockWindowBindingHandler>>()};
194 EngineModifier modifier{engine.get()};
195 modifier.SetImplicitView(&view);
196 view.OnUpdateSemanticsEnabled(true);
197
198 auto bridge = GetAccessibilityBridgeSpy(view);
199 PopulateAXTree(bridge);
200
201 bridge->ResetRecords();
202 bridge->OnAccessibilityEvent({AXNodeFromID(bridge, node_id),
203 {ax_event, ax::mojom::EventFrom::kNone, {}}});
204 ASSERT_EQ(bridge->dispatched_events().size(), 1);
205 EXPECT_EQ(bridge->dispatched_events()[0].event_type, expected_event);
206 }
207
208 void ExpectWinEventFromAXEventOnFocusNode(int32_t node_id,
209 ui::AXEventGenerator::Event ax_event,
210 ax::mojom::Event expected_event,
211 int32_t focus_id) {
212 auto engine = GetTestEngine();
213 FlutterWindowsViewSpy view{
214 engine.get(), std::make_unique<NiceMock<MockWindowBindingHandler>>()};
215 EngineModifier modifier{engine.get()};
216 modifier.SetImplicitView(&view);
217 view.OnUpdateSemanticsEnabled(true);
218
219 auto bridge = GetAccessibilityBridgeSpy(view);
220 PopulateAXTree(bridge);
221
222 bridge->ResetRecords();
223 auto focus_delegate =
224 bridge->GetFlutterPlatformNodeDelegateFromID(focus_id).lock();
225 bridge->SetFocus(std::static_pointer_cast<FlutterPlatformNodeDelegateWindows>(
226 focus_delegate));
227 bridge->OnAccessibilityEvent({AXNodeFromID(bridge, node_id),
228 {ax_event, ax::mojom::EventFrom::kNone, {}}});
229 ASSERT_EQ(bridge->dispatched_events().size(), 1);
230 EXPECT_EQ(bridge->dispatched_events()[0].event_type, expected_event);
231 EXPECT_EQ(bridge->dispatched_events()[0].node_delegate->GetAXNode()->id(),
232 focus_id);
233 }
234
235 } // namespace
236
237 TEST(AccessibilityBridgeWindows, GetParent) {
238 auto engine = GetTestEngine();
239 FlutterWindowsViewSpy view{
240 engine.get(), std::make_unique<NiceMock<MockWindowBindingHandler>>()};
241 EngineModifier modifier{engine.get()};
242 modifier.SetImplicitView(&view);
243 view.OnUpdateSemanticsEnabled(true);
244
245 auto bridge = view.accessibility_bridge().lock();
246 PopulateAXTree(bridge);
247
248 auto node0_delegate = bridge->GetFlutterPlatformNodeDelegateFromID(0).lock();
249 auto node1_delegate = bridge->GetFlutterPlatformNodeDelegateFromID(1).lock();
250 EXPECT_EQ(node0_delegate->GetNativeViewAccessible(),
251 node1_delegate->GetParent());
252 }
253
254 TEST(AccessibilityBridgeWindows, GetParentOnRootRetunsNullptr) {
255 auto engine = GetTestEngine();
256 FlutterWindowsViewSpy view{
257 engine.get(), std::make_unique<NiceMock<MockWindowBindingHandler>>()};
258 EngineModifier modifier{engine.get()};
259 modifier.SetImplicitView(&view);
260 view.OnUpdateSemanticsEnabled(true);
261
262 auto bridge = view.accessibility_bridge().lock();
263 PopulateAXTree(bridge);
264
265 auto node0_delegate = bridge->GetFlutterPlatformNodeDelegateFromID(0).lock();
266 ASSERT_TRUE(node0_delegate->GetParent() == nullptr);
267 }
268
269 TEST(AccessibilityBridgeWindows, DispatchAccessibilityAction) {
270 auto engine = GetTestEngine();
271 FlutterWindowsViewSpy view{
272 engine.get(), std::make_unique<NiceMock<MockWindowBindingHandler>>()};
273 EngineModifier modifier{engine.get()};
274 modifier.SetImplicitView(&view);
275 view.OnUpdateSemanticsEnabled(true);
276
277 auto bridge = view.accessibility_bridge().lock();
278 PopulateAXTree(bridge);
279
280 FlutterSemanticsAction actual_action = kFlutterSemanticsActionTap;
281 modifier.embedder_api().DispatchSemanticsAction = MOCK_ENGINE_PROC(
282 DispatchSemanticsAction,
283 ([&actual_action](FLUTTER_API_SYMBOL(FlutterEngine) engine, uint64_t id,
284 FlutterSemanticsAction action, const uint8_t* data,
285 size_t data_length) {
286 actual_action = action;
287 return kSuccess;
288 }));
289
290 AccessibilityBridgeWindows delegate(&view);
291 delegate.DispatchAccessibilityAction(1, kFlutterSemanticsActionCopy, {});
292 EXPECT_EQ(actual_action, kFlutterSemanticsActionCopy);
293 }
294
295 TEST(AccessibilityBridgeWindows, OnAccessibilityEventAlert) {
296 ExpectWinEventFromAXEvent(0, ui::AXEventGenerator::Event::ALERT,
297 ax::mojom::Event::kAlert);
298 }
299
300 TEST(AccessibilityBridgeWindows, OnAccessibilityEventChildrenChanged) {
301 ExpectWinEventFromAXEvent(0, ui::AXEventGenerator::Event::CHILDREN_CHANGED,
302 ax::mojom::Event::kChildrenChanged);
303 }
304
305 TEST(AccessibilityBridgeWindows, OnAccessibilityEventFocusChanged) {
306 auto engine = GetTestEngine();
307 FlutterWindowsViewSpy view{
308 engine.get(), std::make_unique<NiceMock<MockWindowBindingHandler>>()};
309 EngineModifier modifier{engine.get()};
310 modifier.SetImplicitView(&view);
311 view.OnUpdateSemanticsEnabled(true);
312
313 auto bridge = GetAccessibilityBridgeSpy(view);
314 PopulateAXTree(bridge);
315
316 bridge->ResetRecords();
317 bridge->OnAccessibilityEvent({AXNodeFromID(bridge, 1),
318 {ui::AXEventGenerator::Event::FOCUS_CHANGED,
319 ax::mojom::EventFrom::kNone,
320 {}}});
321 ASSERT_EQ(bridge->dispatched_events().size(), 1);
322 EXPECT_EQ(bridge->dispatched_events()[0].event_type,
323 ax::mojom::Event::kFocus);
324
325 ASSERT_EQ(bridge->focused_nodes().size(), 1);
326 EXPECT_EQ(bridge->focused_nodes()[0], 1);
327 }
328
329 TEST(AccessibilityBridgeWindows, OnAccessibilityEventIgnoredChanged) {
330 // Static test nodes with no text, hint, or scrollability are ignored.
331 ExpectWinEventFromAXEvent(4, ui::AXEventGenerator::Event::IGNORED_CHANGED,
332 ax::mojom::Event::kHide);
333 }
334
335 TEST(AccessibilityBridgeWindows, OnAccessibilityImageAnnotationChanged) {
336 ExpectWinEventFromAXEvent(
337 1, ui::AXEventGenerator::Event::IMAGE_ANNOTATION_CHANGED,
338 ax::mojom::Event::kTextChanged);
339 }
340
341 TEST(AccessibilityBridgeWindows, OnAccessibilityLiveRegionChanged) {
342 ExpectWinEventFromAXEvent(1, ui::AXEventGenerator::Event::LIVE_REGION_CHANGED,
343 ax::mojom::Event::kLiveRegionChanged);
344 }
345
346 TEST(AccessibilityBridgeWindows, OnAccessibilityNameChanged) {
347 ExpectWinEventFromAXEvent(1, ui::AXEventGenerator::Event::NAME_CHANGED,
348 ax::mojom::Event::kTextChanged);
349 }
350
351 TEST(AccessibilityBridgeWindows, OnAccessibilityHScrollPosChanged) {
352 ExpectWinEventFromAXEvent(
353 1, ui::AXEventGenerator::Event::SCROLL_HORIZONTAL_POSITION_CHANGED,
354 ax::mojom::Event::kScrollPositionChanged);
355 }
356
357 TEST(AccessibilityBridgeWindows, OnAccessibilityVScrollPosChanged) {
358 ExpectWinEventFromAXEvent(
359 1, ui::AXEventGenerator::Event::SCROLL_VERTICAL_POSITION_CHANGED,
360 ax::mojom::Event::kScrollPositionChanged);
361 }
362
363 TEST(AccessibilityBridgeWindows, OnAccessibilitySelectedChanged) {
364 ExpectWinEventFromAXEvent(1, ui::AXEventGenerator::Event::SELECTED_CHANGED,
365 ax::mojom::Event::kValueChanged);
366 }
367
368 TEST(AccessibilityBridgeWindows, OnAccessibilitySelectedChildrenChanged) {
369 ExpectWinEventFromAXEvent(
370 2, ui::AXEventGenerator::Event::SELECTED_CHILDREN_CHANGED,
371 ax::mojom::Event::kSelectedChildrenChanged);
372 }
373
374 TEST(AccessibilityBridgeWindows, OnAccessibilitySubtreeCreated) {
375 ExpectWinEventFromAXEvent(0, ui::AXEventGenerator::Event::SUBTREE_CREATED,
376 ax::mojom::Event::kShow);
377 }
378
379 TEST(AccessibilityBridgeWindows, OnAccessibilityValueChanged) {
380 ExpectWinEventFromAXEvent(1, ui::AXEventGenerator::Event::VALUE_CHANGED,
381 ax::mojom::Event::kValueChanged);
382 }
383
384 TEST(AccessibilityBridgeWindows, OnAccessibilityStateChanged) {
385 ExpectWinEventFromAXEvent(
386 1, ui::AXEventGenerator::Event::WIN_IACCESSIBLE_STATE_CHANGED,
387 ax::mojom::Event::kStateChanged);
388 }
389
390 TEST(AccessibilityBridgeWindows, OnDocumentSelectionChanged) {
391 ExpectWinEventFromAXEventOnFocusNode(
392 1, ui::AXEventGenerator::Event::DOCUMENT_SELECTION_CHANGED,
393 ax::mojom::Event::kDocumentSelectionChanged, 2);
394 }
395
396 } // namespace testing
397 } // namespace flutter
accessibility_bridge_windows.h
node_delegate
std::shared_ptr< FlutterPlatformNodeDelegateWindows > node_delegate
Definition: accessibility_bridge_windows_unittests.cc:33
event_type
ax::mojom::Event event_type
Definition: accessibility_bridge_windows_unittests.cc:34
flutter::AccessibilityBridgeWindows
Definition: accessibility_bridge_windows.h:28
flutter::AccessibilityBridgeWindows::DispatchAccessibilityAction
void DispatchAccessibilityAction(AccessibilityNodeId target, FlutterSemanticsAction action, fml::MallocMapping data) override
Dispatch accessibility action back to the Flutter framework. These actions are generated in the nativ...
Definition: accessibility_bridge_windows.cc:162
flutter::AccessibilityBridgeWindows::OnAccessibilityEvent
void OnAccessibilityEvent(ui::AXEventGenerator::TargetedEvent targeted_event) override
Handle accessibility events generated due to accessibility tree changes. These events are needed to b...
Definition: accessibility_bridge_windows.cc:18
flutter::FlutterEngine
Definition: flutter_engine.h:28
flutter_platform_node_delegate_windows.h
flutter_windows_engine.h
flutter_windows_view.h
action
int action
Definition: keyboard_key_handler_unittests.cc:116
flutter::testing::TEST
TEST(AccessibilityBridgeWindows, GetParent)
Definition: accessibility_bridge_windows_unittests.cc:237
flutter
Definition: accessibility_bridge_windows.cc:11
flutter::kImplicitViewId
constexpr FlutterViewId kImplicitViewId
Definition: flutter_windows_engine.h:55
FlutterDesktopEngineProperties
Definition: flutter_windows.h:39
FlutterDesktopEngineProperties::icu_data_path
const wchar_t * icu_data_path
Definition: flutter_windows.h:48
FlutterDesktopEngineProperties::assets_path
const wchar_t * assets_path
Definition: flutter_windows.h:43
FlutterDesktopEngineProperties::aot_library_path
const wchar_t * aot_library_path
Definition: flutter_windows.h:54