1 // Copyright (c) 2012 The Chromium 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 "ui/events/event_dispatcher.h"
6
7 #include "testing/gtest/include/gtest/gtest.h"
8 #include "ui/events/event.h"
9 #include "ui/events/event_dispatcher.h"
10 #include "ui/events/event_target.h"
11 #include "ui/events/event_target_iterator.h"
12 #include "ui/events/event_utils.h"
13
14 namespace ui {
15
16 namespace {
17
18 class TestTarget : public EventTarget {
19 public:
TestTarget()20 TestTarget() : parent_(NULL), valid_(true) {}
~TestTarget()21 virtual ~TestTarget() {}
22
set_parent(TestTarget * parent)23 void set_parent(TestTarget* parent) { parent_ = parent; }
24
valid() const25 bool valid() const { return valid_; }
set_valid(bool valid)26 void set_valid(bool valid) { valid_ = valid; }
27
AddHandlerId(int id)28 void AddHandlerId(int id) {
29 handler_list_.push_back(id);
30 }
31
handler_list() const32 const std::vector<int>& handler_list() const { return handler_list_; }
33
Reset()34 void Reset() {
35 handler_list_.clear();
36 valid_ = true;
37 }
38
39 private:
40 // Overridden from EventTarget:
CanAcceptEvent(const ui::Event & event)41 virtual bool CanAcceptEvent(const ui::Event& event) OVERRIDE {
42 return true;
43 }
44
GetParentTarget()45 virtual EventTarget* GetParentTarget() OVERRIDE {
46 return parent_;
47 }
48
GetChildIterator() const49 virtual scoped_ptr<EventTargetIterator> GetChildIterator() const OVERRIDE {
50 return scoped_ptr<EventTargetIterator>();
51 }
52
GetEventTargeter()53 virtual EventTargeter* GetEventTargeter() OVERRIDE {
54 return NULL;
55 }
56
57 TestTarget* parent_;
58 std::vector<int> handler_list_;
59 bool valid_;
60
61 DISALLOW_COPY_AND_ASSIGN(TestTarget);
62 };
63
64 class TestEventHandler : public EventHandler {
65 public:
TestEventHandler(int id)66 TestEventHandler(int id)
67 : id_(id),
68 event_result_(ER_UNHANDLED),
69 expect_pre_target_(false),
70 expect_post_target_(false),
71 received_pre_target_(false) {
72 }
73
~TestEventHandler()74 virtual ~TestEventHandler() {}
75
ReceivedEvent(Event * event)76 virtual void ReceivedEvent(Event* event) {
77 static_cast<TestTarget*>(event->target())->AddHandlerId(id_);
78 if (event->phase() == ui::EP_POSTTARGET) {
79 EXPECT_TRUE(expect_post_target_);
80 if (expect_pre_target_)
81 EXPECT_TRUE(received_pre_target_);
82 } else if (event->phase() == ui::EP_PRETARGET) {
83 EXPECT_TRUE(expect_pre_target_);
84 received_pre_target_ = true;
85 } else {
86 NOTREACHED();
87 }
88 }
89
set_event_result(EventResult result)90 void set_event_result(EventResult result) { event_result_ = result; }
91
set_expect_pre_target(bool expect)92 void set_expect_pre_target(bool expect) { expect_pre_target_ = expect; }
set_expect_post_target(bool expect)93 void set_expect_post_target(bool expect) { expect_post_target_ = expect; }
94
95 private:
96 // Overridden from EventHandler:
OnEvent(Event * event)97 virtual void OnEvent(Event* event) OVERRIDE {
98 ui::EventHandler::OnEvent(event);
99 ReceivedEvent(event);
100 SetStatusOnEvent(event);
101 }
102
SetStatusOnEvent(Event * event)103 void SetStatusOnEvent(Event* event) {
104 if (event_result_ & ui::ER_CONSUMED)
105 event->StopPropagation();
106 if (event_result_ & ui::ER_HANDLED)
107 event->SetHandled();
108 }
109
110 int id_;
111 EventResult event_result_;
112 bool expect_pre_target_;
113 bool expect_post_target_;
114 bool received_pre_target_;
115
116 DISALLOW_COPY_AND_ASSIGN(TestEventHandler);
117 };
118
119 class NonCancelableEvent : public Event {
120 public:
NonCancelableEvent()121 NonCancelableEvent()
122 : Event(ui::ET_CANCEL_MODE, ui::EventTimeForNow(), 0) {
123 set_cancelable(false);
124 }
125
~NonCancelableEvent()126 virtual ~NonCancelableEvent() {}
127
128 private:
129 DISALLOW_COPY_AND_ASSIGN(NonCancelableEvent);
130 };
131
132 // Destroys the dispatcher-delegate when it receives any event.
133 class EventHandlerDestroyDispatcherDelegate : public TestEventHandler {
134 public:
EventHandlerDestroyDispatcherDelegate(EventDispatcherDelegate * delegate,int id)135 EventHandlerDestroyDispatcherDelegate(EventDispatcherDelegate* delegate,
136 int id)
137 : TestEventHandler(id),
138 dispatcher_delegate_(delegate) {
139 }
140
~EventHandlerDestroyDispatcherDelegate()141 virtual ~EventHandlerDestroyDispatcherDelegate() {}
142
143 private:
ReceivedEvent(Event * event)144 virtual void ReceivedEvent(Event* event) OVERRIDE {
145 TestEventHandler::ReceivedEvent(event);
146 delete dispatcher_delegate_;
147 }
148
149 EventDispatcherDelegate* dispatcher_delegate_;
150
151 DISALLOW_COPY_AND_ASSIGN(EventHandlerDestroyDispatcherDelegate);
152 };
153
154 // Invalidates the target when it receives any event.
155 class InvalidateTargetEventHandler : public TestEventHandler {
156 public:
InvalidateTargetEventHandler(int id)157 explicit InvalidateTargetEventHandler(int id) : TestEventHandler(id) {}
~InvalidateTargetEventHandler()158 virtual ~InvalidateTargetEventHandler() {}
159
160 private:
ReceivedEvent(Event * event)161 virtual void ReceivedEvent(Event* event) OVERRIDE {
162 TestEventHandler::ReceivedEvent(event);
163 TestTarget* target = static_cast<TestTarget*>(event->target());
164 target->set_valid(false);
165 }
166
167 DISALLOW_COPY_AND_ASSIGN(InvalidateTargetEventHandler);
168 };
169
170 // Destroys a second event handler when this handler gets an event.
171 // Optionally also destroys the dispatcher.
172 class EventHandlerDestroyer : public TestEventHandler {
173 public:
EventHandlerDestroyer(int id,EventHandler * destroy)174 EventHandlerDestroyer(int id, EventHandler* destroy)
175 : TestEventHandler(id),
176 to_destroy_(destroy),
177 dispatcher_delegate_(NULL) {
178 }
179
~EventHandlerDestroyer()180 virtual ~EventHandlerDestroyer() {
181 CHECK(!to_destroy_);
182 }
183
set_dispatcher_delegate(EventDispatcherDelegate * dispatcher_delegate)184 void set_dispatcher_delegate(EventDispatcherDelegate* dispatcher_delegate) {
185 dispatcher_delegate_ = dispatcher_delegate;
186 }
187
188 private:
ReceivedEvent(Event * event)189 virtual void ReceivedEvent(Event* event) OVERRIDE {
190 TestEventHandler::ReceivedEvent(event);
191 delete to_destroy_;
192 to_destroy_ = NULL;
193
194 if (dispatcher_delegate_) {
195 delete dispatcher_delegate_;
196 dispatcher_delegate_ = NULL;
197 }
198 }
199
200 EventHandler* to_destroy_;
201 EventDispatcherDelegate* dispatcher_delegate_;
202
203 DISALLOW_COPY_AND_ASSIGN(EventHandlerDestroyer);
204 };
205
206 class TestEventDispatcher : public EventDispatcherDelegate {
207 public:
TestEventDispatcher()208 TestEventDispatcher() {}
209
~TestEventDispatcher()210 virtual ~TestEventDispatcher() {}
211
ProcessEvent(EventTarget * target,Event * event)212 EventDispatchDetails ProcessEvent(EventTarget* target, Event* event) {
213 return DispatchEvent(target, event);
214 }
215
216 private:
217 // Overridden from EventDispatcherDelegate:
CanDispatchToTarget(EventTarget * target)218 virtual bool CanDispatchToTarget(EventTarget* target) OVERRIDE {
219 TestTarget* test_target = static_cast<TestTarget*>(target);
220 return test_target->valid();
221 }
222
223 DISALLOW_COPY_AND_ASSIGN(TestEventDispatcher);
224 };
225
226 } // namespace
227
TEST(EventDispatcherTest,EventDispatchOrder)228 TEST(EventDispatcherTest, EventDispatchOrder) {
229 TestEventDispatcher dispatcher;
230 TestTarget parent, child;
231 TestEventHandler h1(1), h2(2), h3(3), h4(4);
232 TestEventHandler h5(5), h6(6), h7(7), h8(8);
233
234 child.set_parent(&parent);
235
236 parent.AddPreTargetHandler(&h1);
237 parent.AddPreTargetHandler(&h2);
238
239 child.AddPreTargetHandler(&h3);
240 child.AddPreTargetHandler(&h4);
241
242 h1.set_expect_pre_target(true);
243 h2.set_expect_pre_target(true);
244 h3.set_expect_pre_target(true);
245 h4.set_expect_pre_target(true);
246
247 child.AddPostTargetHandler(&h5);
248 child.AddPostTargetHandler(&h6);
249
250 parent.AddPostTargetHandler(&h7);
251 parent.AddPostTargetHandler(&h8);
252
253 h5.set_expect_post_target(true);
254 h6.set_expect_post_target(true);
255 h7.set_expect_post_target(true);
256 h8.set_expect_post_target(true);
257
258 MouseEvent mouse(ui::ET_MOUSE_MOVED, gfx::Point(3, 4),
259 gfx::Point(3, 4), 0, 0);
260 Event::DispatcherApi event_mod(&mouse);
261 dispatcher.ProcessEvent(&child, &mouse);
262 EXPECT_FALSE(mouse.stopped_propagation());
263 EXPECT_FALSE(mouse.handled());
264
265 {
266 int expected[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
267 EXPECT_EQ(
268 std::vector<int>(expected, expected + sizeof(expected) / sizeof(int)),
269 child.handler_list());
270 }
271
272 child.Reset();
273 event_mod.set_phase(EP_PREDISPATCH);
274 event_mod.set_result(ER_UNHANDLED);
275
276 h1.set_event_result(ER_HANDLED);
277 dispatcher.ProcessEvent(&child, &mouse);
278 EXPECT_EQ(EP_POSTDISPATCH, mouse.phase());
279 EXPECT_FALSE(mouse.stopped_propagation());
280 EXPECT_TRUE(mouse.handled());
281 {
282 // |h1| marks the event as handled. So only the pre-target handlers should
283 // receive the event.
284 int expected[] = { 1, 2, 3, 4 };
285 EXPECT_EQ(
286 std::vector<int>(expected, expected + sizeof(expected) / sizeof(int)),
287 child.handler_list());
288 }
289
290 child.Reset();
291 event_mod.set_phase(EP_PREDISPATCH);
292 event_mod.set_result(ER_UNHANDLED);
293
294 int nexpected[] = { 1, 2, 3, 4, 5 };
295 h1.set_event_result(ER_UNHANDLED);
296 h5.set_event_result(ER_CONSUMED);
297 dispatcher.ProcessEvent(&child, &mouse);
298 EXPECT_EQ(EP_POSTDISPATCH, mouse.phase());
299 EXPECT_TRUE(mouse.stopped_propagation());
300 EXPECT_TRUE(mouse.handled());
301 EXPECT_EQ(
302 std::vector<int>(nexpected, nexpected + sizeof(nexpected) / sizeof(int)),
303 child.handler_list());
304
305 child.Reset();
306 event_mod.set_phase(EP_PREDISPATCH);
307 event_mod.set_result(ER_UNHANDLED);
308
309 int exp[] = { 1 };
310 h1.set_event_result(ER_CONSUMED);
311 dispatcher.ProcessEvent(&child, &mouse);
312 EXPECT_EQ(EP_POSTDISPATCH, mouse.phase());
313 EXPECT_TRUE(mouse.stopped_propagation());
314 EXPECT_TRUE(mouse.handled());
315 EXPECT_EQ(
316 std::vector<int>(exp, exp + sizeof(exp) / sizeof(int)),
317 child.handler_list());
318 }
319
320 // Tests that the event-phases are correct.
TEST(EventDispatcherTest,EventDispatchPhase)321 TEST(EventDispatcherTest, EventDispatchPhase) {
322 TestEventDispatcher dispatcher;
323 TestTarget target;
324
325 TestEventHandler handler(11);
326
327 target.AddPreTargetHandler(&handler);
328 target.AddPostTargetHandler(&handler);
329 handler.set_expect_pre_target(true);
330 handler.set_expect_post_target(true);
331
332 MouseEvent mouse(ui::ET_MOUSE_MOVED, gfx::Point(3, 4),
333 gfx::Point(3, 4), 0, 0);
334 Event::DispatcherApi event_mod(&mouse);
335 dispatcher.ProcessEvent(&target, &mouse);
336 EXPECT_EQ(ER_UNHANDLED, mouse.result());
337
338 int handlers[] = { 11, 11 };
339 EXPECT_EQ(
340 std::vector<int>(handlers, handlers + sizeof(handlers) / sizeof(int)),
341 target.handler_list());
342 }
343
344 // Tests that if the dispatcher is destroyed in the middle of pre or post-target
345 // dispatching events, it doesn't cause a crash.
TEST(EventDispatcherTest,EventDispatcherDestroyedDuringDispatch)346 TEST(EventDispatcherTest, EventDispatcherDestroyedDuringDispatch) {
347 // Test for pre-target first.
348 {
349 TestEventDispatcher* dispatcher = new TestEventDispatcher();
350 TestTarget target;
351 EventHandlerDestroyDispatcherDelegate handler(dispatcher, 5);
352 TestEventHandler h1(1), h2(2);
353
354 target.AddPreTargetHandler(&h1);
355 target.AddPreTargetHandler(&handler);
356 target.AddPreTargetHandler(&h2);
357
358 h1.set_expect_pre_target(true);
359 handler.set_expect_pre_target(true);
360 // |h2| should not receive any events at all since |handler| will have
361 // destroyed the dispatcher.
362 h2.set_expect_pre_target(false);
363
364 MouseEvent mouse(ui::ET_MOUSE_MOVED, gfx::Point(3, 4),
365 gfx::Point(3, 4), 0, 0);
366 EventDispatchDetails details = dispatcher->ProcessEvent(&target, &mouse);
367 EXPECT_TRUE(details.dispatcher_destroyed);
368 EXPECT_EQ(ER_CONSUMED, mouse.result());
369 EXPECT_EQ(2U, target.handler_list().size());
370 EXPECT_EQ(1, target.handler_list()[0]);
371 EXPECT_EQ(5, target.handler_list()[1]);
372 }
373
374 // Test for non-cancelable event.
375 {
376 TestEventDispatcher* dispatcher = new TestEventDispatcher();
377 TestTarget target;
378 EventHandlerDestroyDispatcherDelegate handler(dispatcher, 5);
379 TestEventHandler h1(1), h2(2);
380
381 target.AddPreTargetHandler(&h1);
382 target.AddPreTargetHandler(&handler);
383 target.AddPreTargetHandler(&h2);
384
385 h1.set_expect_pre_target(true);
386 handler.set_expect_pre_target(true);
387 // |h2| should not receive any events at all since |handler| will have
388 // destroyed the dispatcher.
389 h2.set_expect_pre_target(false);
390
391 NonCancelableEvent event;
392 EventDispatchDetails details = dispatcher->ProcessEvent(&target, &event);
393 EXPECT_TRUE(details.dispatcher_destroyed);
394 EXPECT_EQ(2U, target.handler_list().size());
395 EXPECT_EQ(1, target.handler_list()[0]);
396 EXPECT_EQ(5, target.handler_list()[1]);
397 }
398
399 // Now test for post-target.
400 {
401 TestEventDispatcher* dispatcher = new TestEventDispatcher();
402 TestTarget target;
403 EventHandlerDestroyDispatcherDelegate handler(dispatcher, 5);
404 TestEventHandler h1(1), h2(2);
405
406 target.AddPostTargetHandler(&h1);
407 target.AddPostTargetHandler(&handler);
408 target.AddPostTargetHandler(&h2);
409
410 h1.set_expect_post_target(true);
411 handler.set_expect_post_target(true);
412 // |h2| should not receive any events at all since |handler| will have
413 // destroyed the dispatcher.
414 h2.set_expect_post_target(false);
415
416 MouseEvent mouse(ui::ET_MOUSE_MOVED, gfx::Point(3, 4),
417 gfx::Point(3, 4), 0, 0);
418 EventDispatchDetails details = dispatcher->ProcessEvent(&target, &mouse);
419 EXPECT_TRUE(details.dispatcher_destroyed);
420 EXPECT_EQ(ER_CONSUMED, mouse.result());
421 EXPECT_EQ(2U, target.handler_list().size());
422 EXPECT_EQ(1, target.handler_list()[0]);
423 EXPECT_EQ(5, target.handler_list()[1]);
424 }
425
426 // Test for non-cancelable event.
427 {
428 TestEventDispatcher* dispatcher = new TestEventDispatcher();
429 TestTarget target;
430 EventHandlerDestroyDispatcherDelegate handler(dispatcher, 5);
431 TestEventHandler h1(1), h2(2);
432
433 target.AddPostTargetHandler(&h1);
434 target.AddPostTargetHandler(&handler);
435 target.AddPostTargetHandler(&h2);
436
437 h1.set_expect_post_target(true);
438 handler.set_expect_post_target(true);
439 // |h2| should not receive any events at all since |handler| will have
440 // destroyed the dispatcher.
441 h2.set_expect_post_target(false);
442
443 NonCancelableEvent event;
444 EventDispatchDetails details = dispatcher->ProcessEvent(&target, &event);
445 EXPECT_TRUE(details.dispatcher_destroyed);
446 EXPECT_EQ(2U, target.handler_list().size());
447 EXPECT_EQ(1, target.handler_list()[0]);
448 EXPECT_EQ(5, target.handler_list()[1]);
449 }
450 }
451
452 // Tests that a target becoming invalid in the middle of pre- or post-target
453 // event processing aborts processing.
TEST(EventDispatcherTest,EventDispatcherInvalidateTarget)454 TEST(EventDispatcherTest, EventDispatcherInvalidateTarget) {
455 TestEventDispatcher dispatcher;
456 TestTarget target;
457 TestEventHandler h1(1);
458 InvalidateTargetEventHandler invalidate_handler(2);
459 TestEventHandler h3(3);
460
461 target.AddPreTargetHandler(&h1);
462 target.AddPreTargetHandler(&invalidate_handler);
463 target.AddPreTargetHandler(&h3);
464
465 h1.set_expect_pre_target(true);
466 invalidate_handler.set_expect_pre_target(true);
467 // |h3| should not receive events as the target will be invalidated.
468 h3.set_expect_pre_target(false);
469
470 MouseEvent mouse(ui::ET_MOUSE_MOVED, gfx::Point(3, 4), gfx::Point(3, 4), 0,
471 0);
472 EventDispatchDetails details = dispatcher.ProcessEvent(&target, &mouse);
473 EXPECT_FALSE(details.dispatcher_destroyed);
474 EXPECT_TRUE(details.target_destroyed);
475 EXPECT_FALSE(target.valid());
476 EXPECT_TRUE(mouse.stopped_propagation());
477 EXPECT_EQ(2U, target.handler_list().size());
478 EXPECT_EQ(1, target.handler_list()[0]);
479 EXPECT_EQ(2, target.handler_list()[1]);
480
481 // Test for non-cancelable event.
482 target.Reset();
483 NonCancelableEvent event;
484 details = dispatcher.ProcessEvent(&target, &event);
485 EXPECT_FALSE(details.dispatcher_destroyed);
486 EXPECT_TRUE(details.target_destroyed);
487 EXPECT_FALSE(target.valid());
488 EXPECT_EQ(2U, target.handler_list().size());
489 EXPECT_EQ(1, target.handler_list()[0]);
490 EXPECT_EQ(2, target.handler_list()[1]);
491 }
492
493 // Tests that if an event-handler gets destroyed during event-dispatch, it does
494 // not cause a crash.
TEST(EventDispatcherTest,EventHandlerDestroyedDuringDispatch)495 TEST(EventDispatcherTest, EventHandlerDestroyedDuringDispatch) {
496 {
497 TestEventDispatcher dispatcher;
498 TestTarget target;
499 TestEventHandler h1(1);
500 TestEventHandler* h3 = new TestEventHandler(3);
501 EventHandlerDestroyer handle_destroyer(2, h3);
502
503 target.AddPreTargetHandler(&h1);
504 target.AddPreTargetHandler(&handle_destroyer);
505 target.AddPreTargetHandler(h3);
506
507 h1.set_expect_pre_target(true);
508 handle_destroyer.set_expect_pre_target(true);
509 // |h3| should not receive events since |handle_destroyer| will have
510 // destroyed it.
511 h3->set_expect_pre_target(false);
512
513 MouseEvent mouse(ui::ET_MOUSE_MOVED, gfx::Point(3, 4), gfx::Point(3, 4), 0,
514 0);
515 EventDispatchDetails details = dispatcher.ProcessEvent(&target, &mouse);
516 EXPECT_FALSE(details.dispatcher_destroyed);
517 EXPECT_FALSE(details.target_destroyed);
518 EXPECT_FALSE(mouse.stopped_propagation());
519 EXPECT_EQ(2U, target.handler_list().size());
520 EXPECT_EQ(1, target.handler_list()[0]);
521 EXPECT_EQ(2, target.handler_list()[1]);
522 }
523
524 // Test for non-cancelable events.
525 {
526 TestEventDispatcher dispatcher;
527 TestTarget target;
528 TestEventHandler h1(1);
529 TestEventHandler* h3 = new TestEventHandler(3);
530 EventHandlerDestroyer handle_destroyer(2, h3);
531
532 target.AddPreTargetHandler(&h1);
533 target.AddPreTargetHandler(&handle_destroyer);
534 target.AddPreTargetHandler(h3);
535
536 h1.set_expect_pre_target(true);
537 handle_destroyer.set_expect_pre_target(true);
538 h3->set_expect_pre_target(false);
539
540 NonCancelableEvent event;
541 EventDispatchDetails details = dispatcher.ProcessEvent(&target, &event);
542 EXPECT_FALSE(details.dispatcher_destroyed);
543 EXPECT_FALSE(details.target_destroyed);
544 EXPECT_EQ(2U, target.handler_list().size());
545 EXPECT_EQ(1, target.handler_list()[0]);
546 EXPECT_EQ(2, target.handler_list()[1]);
547 }
548 }
549
550 // Tests that things work correctly if an event-handler destroys both the
551 // dispatcher and a handler.
TEST(EventDispatcherTest,EventHandlerAndDispatcherDestroyedDuringDispatch)552 TEST(EventDispatcherTest, EventHandlerAndDispatcherDestroyedDuringDispatch) {
553 {
554 TestEventDispatcher* dispatcher = new TestEventDispatcher();
555 TestTarget target;
556 TestEventHandler h1(1);
557 TestEventHandler* h3 = new TestEventHandler(3);
558 EventHandlerDestroyer destroyer(2, h3);
559
560 target.AddPreTargetHandler(&h1);
561 target.AddPreTargetHandler(&destroyer);
562 target.AddPreTargetHandler(h3);
563
564 h1.set_expect_pre_target(true);
565 destroyer.set_expect_pre_target(true);
566 destroyer.set_dispatcher_delegate(dispatcher);
567 // |h3| should not receive events since |destroyer| will have destroyed
568 // it.
569 h3->set_expect_pre_target(false);
570
571 MouseEvent mouse(ui::ET_MOUSE_MOVED, gfx::Point(3, 4), gfx::Point(3, 4), 0,
572 0);
573 EventDispatchDetails details = dispatcher->ProcessEvent(&target, &mouse);
574 EXPECT_TRUE(details.dispatcher_destroyed);
575 EXPECT_TRUE(mouse.stopped_propagation());
576 EXPECT_EQ(2U, target.handler_list().size());
577 EXPECT_EQ(1, target.handler_list()[0]);
578 EXPECT_EQ(2, target.handler_list()[1]);
579 }
580
581 // Test for non-cancelable events.
582 {
583 TestEventDispatcher* dispatcher = new TestEventDispatcher();
584 TestTarget target;
585 TestEventHandler h1(1);
586 TestEventHandler* h3 = new TestEventHandler(3);
587 EventHandlerDestroyer destroyer(2, h3);
588
589 target.AddPreTargetHandler(&h1);
590 target.AddPreTargetHandler(&destroyer);
591 target.AddPreTargetHandler(h3);
592
593 h1.set_expect_pre_target(true);
594 destroyer.set_expect_pre_target(true);
595 destroyer.set_dispatcher_delegate(dispatcher);
596 // |h3| should not receive events since |destroyer| will have destroyed
597 // it.
598 h3->set_expect_pre_target(false);
599
600 NonCancelableEvent event;
601 EventDispatchDetails details = dispatcher->ProcessEvent(&target, &event);
602 EXPECT_TRUE(details.dispatcher_destroyed);
603 EXPECT_EQ(2U, target.handler_list().size());
604 EXPECT_EQ(1, target.handler_list()[0]);
605 EXPECT_EQ(2, target.handler_list()[1]);
606 }
607 }
608
609 } // namespace ui
610