ui/events/event_processor_unittest.cc

   1 // Copyright (c) 2013 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 <vector>
   6
   7 #include "testing/gtest/include/gtest/gtest.h"
   8 #include "ui/events/event.h"
   9 #include "ui/events/event_targeter.h"
  10 #include "ui/events/test/events_test_utils.h"
  11 #include "ui/events/test/test_event_handler.h"
  12 #include "ui/events/test/test_event_processor.h"
  13 #include "ui/events/test/test_event_target.h"
  14
  15 typedef std::vector<std::string> HandlerSequenceRecorder;
  16
  17 namespace ui {
  18 namespace test {
  19
  20 class EventProcessorTest : public testing::Test {
  21  public:
  22   EventProcessorTest() {}
  23   ~EventProcessorTest() override {}
  24
  25   // testing::Test:
  26   void SetUp() override {
  27     processor_.SetRoot(scoped_ptr<EventTarget>(new TestEventTarget()));
  28     processor_.Reset();
  29     root()->SetEventTargeter(make_scoped_ptr(new EventTargeter()));
  30   }
  31
  32   TestEventTarget* root() {
  33     return static_cast<TestEventTarget*>(processor_.GetRootTarget());
  34   }
  35
  36   TestEventProcessor* processor() {
  37     return &processor_;
  38   }
  39
  40   void DispatchEvent(Event* event) {
  41     processor_.OnEventFromSource(event);
  42   }
  43
  44  protected:
  45   TestEventProcessor processor_;
  46
  47   DISALLOW_COPY_AND_ASSIGN(EventProcessorTest);
  48 };
  49
  50 TEST_F(EventProcessorTest, Basic) {
  51   scoped_ptr<TestEventTarget> child(new TestEventTarget());
  52   root()->AddChild(child.Pass());
  53
  54   MouseEvent mouse(ET_MOUSE_MOVED, gfx::Point(10, 10), gfx::Point(10, 10),
  55                    EF_NONE, EF_NONE);
  56   DispatchEvent(&mouse);
  57   EXPECT_TRUE(root()->child_at(0)->DidReceiveEvent(ET_MOUSE_MOVED));
  58   EXPECT_FALSE(root()->DidReceiveEvent(ET_MOUSE_MOVED));
  59
  60   root()->RemoveChild(root()->child_at(0));
  61   DispatchEvent(&mouse);
  62   EXPECT_TRUE(root()->DidReceiveEvent(ET_MOUSE_MOVED));
  63 }
  64
  65 template<typename T>
  66 class BoundsEventTargeter : public EventTargeter {
  67  public:
  68   virtual ~BoundsEventTargeter() {}
  69
  70  protected:
  71   virtual bool SubtreeShouldBeExploredForEvent(
  72       EventTarget* target, const LocatedEvent& event) override {
  73     T* t = static_cast<T*>(target);
  74     return (t->bounds().Contains(event.location()));
  75   }
  76 };
  77
  78 class BoundsTestTarget : public TestEventTarget {
  79  public:
  80   BoundsTestTarget() {}
  81   ~BoundsTestTarget() override {}
  82
  83   void set_bounds(gfx::Rect rect) { bounds_ = rect; }
  84   gfx::Rect bounds() const { return bounds_; }
  85
  86   static void ConvertPointToTarget(BoundsTestTarget* source,
  87                                    BoundsTestTarget* target,
  88                                    gfx::Point* location) {
  89     gfx::Vector2d vector;
  90     if (source->Contains(target)) {
  91       for (; target && target != source;
  92            target = static_cast<BoundsTestTarget*>(target->parent())) {
  93         vector += target->bounds().OffsetFromOrigin();
  94       }
  95       *location -= vector;
  96     } else if (target->Contains(source)) {
  97       for (; source && source != target;
  98            source = static_cast<BoundsTestTarget*>(source->parent())) {
  99         vector += source->bounds().OffsetFromOrigin();
 100       }
 101       *location += vector;
 102     } else {
 103       NOTREACHED();
 104     }
 105   }
 106
 107  private:
 108   // EventTarget:
 109   void ConvertEventToTarget(EventTarget* target, LocatedEvent* event) override {
 110     event->ConvertLocationToTarget(this,
 111                                    static_cast<BoundsTestTarget*>(target));
 112   }
 113
 114   gfx::Rect bounds_;
 115
 116   DISALLOW_COPY_AND_ASSIGN(BoundsTestTarget);
 117 };
 118
 119 TEST_F(EventProcessorTest, Bounds) {
 120   scoped_ptr<BoundsTestTarget> parent(new BoundsTestTarget());
 121   scoped_ptr<BoundsTestTarget> child(new BoundsTestTarget());
 122   scoped_ptr<BoundsTestTarget> grandchild(new BoundsTestTarget());
 123
 124   parent->set_bounds(gfx::Rect(0, 0, 30, 30));
 125   child->set_bounds(gfx::Rect(5, 5, 20, 20));
 126   grandchild->set_bounds(gfx::Rect(5, 5, 5, 5));
 127
 128   child->AddChild(scoped_ptr<TestEventTarget>(grandchild.Pass()));
 129   parent->AddChild(scoped_ptr<TestEventTarget>(child.Pass()));
 130   root()->AddChild(scoped_ptr<TestEventTarget>(parent.Pass()));
 131
 132   ASSERT_EQ(1u, root()->child_count());
 133   ASSERT_EQ(1u, root()->child_at(0)->child_count());
 134   ASSERT_EQ(1u, root()->child_at(0)->child_at(0)->child_count());
 135
 136   TestEventTarget* parent_r = root()->child_at(0);
 137   TestEventTarget* child_r = parent_r->child_at(0);
 138   TestEventTarget* grandchild_r = child_r->child_at(0);
 139
 140   // Dispatch a mouse event that falls on the parent, but not on the child. When
 141   // the default event-targeter used, the event will still reach |grandchild|,
 142   // because the default targeter does not look at the bounds.
 143   MouseEvent mouse(ET_MOUSE_MOVED, gfx::Point(1, 1), gfx::Point(1, 1), EF_NONE,
 144                    EF_NONE);
 145   DispatchEvent(&mouse);
 146   EXPECT_FALSE(root()->DidReceiveEvent(ET_MOUSE_MOVED));
 147   EXPECT_FALSE(parent_r->DidReceiveEvent(ET_MOUSE_MOVED));
 148   EXPECT_FALSE(child_r->DidReceiveEvent(ET_MOUSE_MOVED));
 149   EXPECT_TRUE(grandchild_r->DidReceiveEvent(ET_MOUSE_MOVED));
 150   grandchild_r->ResetReceivedEvents();
 151
 152   // Now install a targeter on the parent that looks at the bounds and makes
 153   // sure the event reaches the target only if the location of the event within
 154   // the bounds of the target.
 155   MouseEvent mouse2(ET_MOUSE_MOVED, gfx::Point(1, 1), gfx::Point(1, 1), EF_NONE,
 156                     EF_NONE);
 157   parent_r->SetEventTargeter(scoped_ptr<EventTargeter>(
 158       new BoundsEventTargeter<BoundsTestTarget>()));
 159   DispatchEvent(&mouse2);
 160   EXPECT_FALSE(root()->DidReceiveEvent(ET_MOUSE_MOVED));
 161   EXPECT_TRUE(parent_r->DidReceiveEvent(ET_MOUSE_MOVED));
 162   EXPECT_FALSE(child_r->DidReceiveEvent(ET_MOUSE_MOVED));
 163   EXPECT_FALSE(grandchild_r->DidReceiveEvent(ET_MOUSE_MOVED));
 164   parent_r->ResetReceivedEvents();
 165
 166   MouseEvent second(ET_MOUSE_MOVED, gfx::Point(12, 12), gfx::Point(12, 12),
 167                     EF_NONE, EF_NONE);
 168   DispatchEvent(&second);
 169   EXPECT_FALSE(root()->DidReceiveEvent(ET_MOUSE_MOVED));
 170   EXPECT_FALSE(parent_r->DidReceiveEvent(ET_MOUSE_MOVED));
 171   EXPECT_FALSE(child_r->DidReceiveEvent(ET_MOUSE_MOVED));
 172   EXPECT_TRUE(grandchild_r->DidReceiveEvent(ET_MOUSE_MOVED));
 173 }
 174
 175 // ReDispatchEventHandler is used to receive mouse events and forward them
 176 // to a specified EventProcessor. Verifies that the event has the correct
 177 // target and phase both before and after the nested event processing. Also
 178 // verifies that the location of the event remains the same after it has
 179 // been processed by the second EventProcessor.
 180 class ReDispatchEventHandler : public TestEventHandler {
 181  public:
 182   ReDispatchEventHandler(EventProcessor* processor, EventTarget* target)
 183       : processor_(processor), expected_target_(target) {}
 184   ~ReDispatchEventHandler() override {}
 185
 186   // TestEventHandler:
 187   void OnMouseEvent(MouseEvent* event) override {
 188     TestEventHandler::OnMouseEvent(event);
 189
 190     EXPECT_EQ(expected_target_, event->target());
 191     EXPECT_EQ(EP_TARGET, event->phase());
 192
 193     gfx::Point location(event->location());
 194     EventDispatchDetails details = processor_->OnEventFromSource(event);
 195     EXPECT_FALSE(details.dispatcher_destroyed);
 196     EXPECT_FALSE(details.target_destroyed);
 197
 198     // The nested event-processing should not have mutated the target,
 199     // phase, or location of |event|.
 200     EXPECT_EQ(expected_target_, event->target());
 201     EXPECT_EQ(EP_TARGET, event->phase());
 202     EXPECT_EQ(location, event->location());
 203   }
 204
 205  private:
 206   EventProcessor* processor_;
 207   EventTarget* expected_target_;
 208
 209   DISALLOW_COPY_AND_ASSIGN(ReDispatchEventHandler);
 210 };
 211
 212 // Verifies that the phase and target information of an event is not mutated
 213 // as a result of sending the event to an event processor while it is still
 214 // being processed by another event processor.
 215 TEST_F(EventProcessorTest, NestedEventProcessing) {
 216   // Add one child to the default event processor used in this test suite.
 217   scoped_ptr<TestEventTarget> child(new TestEventTarget());
 218   root()->AddChild(child.Pass());
 219
 220   // Define a second root target and child.
 221   scoped_ptr<EventTarget> second_root_scoped(new TestEventTarget());
 222   TestEventTarget* second_root =
 223       static_cast<TestEventTarget*>(second_root_scoped.get());
 224   second_root->SetEventTargeter(make_scoped_ptr(new EventTargeter()));
 225   scoped_ptr<TestEventTarget> second_child(new TestEventTarget());
 226   second_root->AddChild(second_child.Pass());
 227
 228   // Define a second event processor which owns the second root.
 229   scoped_ptr<TestEventProcessor> second_processor(new TestEventProcessor());
 230   second_processor->SetRoot(second_root_scoped.Pass());
 231
 232   // Indicate that an event which is dispatched to the child target owned by the
 233   // first event processor should be handled by |target_handler| instead.
 234   scoped_ptr<TestEventHandler> target_handler(
 235       new ReDispatchEventHandler(second_processor.get(), root()->child_at(0)));
 236   root()->child_at(0)->set_target_handler(target_handler.get());
 237
 238   // Dispatch a mouse event to the tree of event targets owned by the first
 239   // event processor, checking in ReDispatchEventHandler that the phase and
 240   // target information of the event is correct.
 241   MouseEvent mouse(
 242       ET_MOUSE_MOVED, gfx::Point(10, 10), gfx::Point(10, 10), EF_NONE, EF_NONE);
 243   DispatchEvent(&mouse);
 244
 245   // Verify also that |mouse| was seen by the child nodes contained in both
 246   // event processors and that the event was not handled.
 247   EXPECT_TRUE(root()->child_at(0)->DidReceiveEvent(ET_MOUSE_MOVED));
 248   EXPECT_TRUE(second_root->child_at(0)->DidReceiveEvent(ET_MOUSE_MOVED));
 249   EXPECT_FALSE(mouse.handled());
 250   second_root->child_at(0)->ResetReceivedEvents();
 251   root()->child_at(0)->ResetReceivedEvents();
 252
 253   // Indicate that the child of the second root should handle events, and
 254   // dispatch another mouse event to verify that it is marked as handled.
 255   second_root->child_at(0)->set_mark_events_as_handled(true);
 256   MouseEvent mouse2(
 257       ET_MOUSE_MOVED, gfx::Point(10, 10), gfx::Point(10, 10), EF_NONE, EF_NONE);
 258   DispatchEvent(&mouse2);
 259   EXPECT_TRUE(root()->child_at(0)->DidReceiveEvent(ET_MOUSE_MOVED));
 260   EXPECT_TRUE(second_root->child_at(0)->DidReceiveEvent(ET_MOUSE_MOVED));
 261   EXPECT_TRUE(mouse2.handled());
 262 }
 263
 264 // Verifies that OnEventProcessingFinished() is called when an event
 265 // has been handled.
 266 TEST_F(EventProcessorTest, OnEventProcessingFinished) {
 267   scoped_ptr<TestEventTarget> child(new TestEventTarget());
 268   child->set_mark_events_as_handled(true);
 269   root()->AddChild(child.Pass());
 270
 271   // Dispatch a mouse event. We expect the event to be seen by the target,
 272   // handled, and we expect OnEventProcessingFinished() to be invoked once.
 273   MouseEvent mouse(ET_MOUSE_MOVED, gfx::Point(10, 10), gfx::Point(10, 10),
 274                    EF_NONE, EF_NONE);
 275   DispatchEvent(&mouse);
 276   EXPECT_TRUE(root()->child_at(0)->DidReceiveEvent(ET_MOUSE_MOVED));
 277   EXPECT_FALSE(root()->DidReceiveEvent(ET_MOUSE_MOVED));
 278   EXPECT_TRUE(mouse.handled());
 279   EXPECT_EQ(1, processor()->num_times_processing_finished());
 280 }
 281
 282 // Verifies that OnEventProcessingStarted() has been called when starting to
 283 // process an event, and that processing does not take place if
 284 // OnEventProcessingStarted() marks the event as handled. Also verifies that
 285 // OnEventProcessingFinished() is also called in either case.
 286 TEST_F(EventProcessorTest, OnEventProcessingStarted) {
 287   scoped_ptr<TestEventTarget> child(new TestEventTarget());
 288   root()->AddChild(child.Pass());
 289
 290   // Dispatch a mouse event. We expect the event to be seen by the target,
 291   // OnEventProcessingStarted() should be called once, and
 292   // OnEventProcessingFinished() should be called once. The event should
 293   // remain unhandled.
 294   MouseEvent mouse(
 295       ET_MOUSE_MOVED, gfx::Point(10, 10), gfx::Point(10, 10), EF_NONE, EF_NONE);
 296   DispatchEvent(&mouse);
 297   EXPECT_TRUE(root()->child_at(0)->DidReceiveEvent(ET_MOUSE_MOVED));
 298   EXPECT_FALSE(root()->DidReceiveEvent(ET_MOUSE_MOVED));
 299   EXPECT_FALSE(mouse.handled());
 300   EXPECT_EQ(1, processor()->num_times_processing_started());
 301   EXPECT_EQ(1, processor()->num_times_processing_finished());
 302   processor()->Reset();
 303   root()->ResetReceivedEvents();
 304   root()->child_at(0)->ResetReceivedEvents();
 305
 306   // Dispatch another mouse event, but with OnEventProcessingStarted() marking
 307   // the event as handled to prevent processing. We expect the event to not be
 308   // seen by the target this time, but OnEventProcessingStarted() and
 309   // OnEventProcessingFinished() should both still be called once.
 310   processor()->set_should_processing_occur(false);
 311   MouseEvent mouse2(
 312       ET_MOUSE_MOVED, gfx::Point(10, 10), gfx::Point(10, 10), EF_NONE, EF_NONE);
 313   DispatchEvent(&mouse2);
 314   EXPECT_FALSE(root()->child_at(0)->DidReceiveEvent(ET_MOUSE_MOVED));
 315   EXPECT_FALSE(root()->DidReceiveEvent(ET_MOUSE_MOVED));
 316   EXPECT_TRUE(mouse2.handled());
 317   EXPECT_EQ(1, processor()->num_times_processing_started());
 318   EXPECT_EQ(1, processor()->num_times_processing_finished());
 319 }
 320
 321 class IgnoreEventTargeter : public EventTargeter {
 322  public:
 323   IgnoreEventTargeter() {}
 324   ~IgnoreEventTargeter() override {}
 325
 326  private:
 327   // EventTargeter:
 328   bool SubtreeShouldBeExploredForEvent(EventTarget* target,
 329                                        const LocatedEvent& event) override {
 330     return false;
 331   }
 332 };
 333
 334 // Verifies that the EventTargeter installed on an EventTarget can dictate
 335 // whether the target itself can process an event.
 336 TEST_F(EventProcessorTest, TargeterChecksOwningEventTarget) {
 337   scoped_ptr<TestEventTarget> child(new TestEventTarget());
 338   root()->AddChild(child.Pass());
 339
 340   MouseEvent mouse(ET_MOUSE_MOVED, gfx::Point(10, 10), gfx::Point(10, 10),
 341                    EF_NONE, EF_NONE);
 342   DispatchEvent(&mouse);
 343   EXPECT_TRUE(root()->child_at(0)->DidReceiveEvent(ET_MOUSE_MOVED));
 344   EXPECT_FALSE(root()->DidReceiveEvent(ET_MOUSE_MOVED));
 345   root()->child_at(0)->ResetReceivedEvents();
 346
 347   // Install an event handler on |child| which always prevents the target from
 348   // receiving event.
 349   root()->child_at(0)->SetEventTargeter(
 350       scoped_ptr<EventTargeter>(new IgnoreEventTargeter()));
 351   MouseEvent mouse2(ET_MOUSE_MOVED, gfx::Point(10, 10), gfx::Point(10, 10),
 352                     EF_NONE, EF_NONE);
 353   DispatchEvent(&mouse2);
 354   EXPECT_FALSE(root()->child_at(0)->DidReceiveEvent(ET_MOUSE_MOVED));
 355   EXPECT_TRUE(root()->DidReceiveEvent(ET_MOUSE_MOVED));
 356 }
 357
 358 // An EventTargeter which is used to allow a bubbling behaviour in event
 359 // dispatch: if an event is not handled after being dispatched to its
 360 // initial target, the event is dispatched to the next-best target as
 361 // specified by FindNextBestTarget().
 362 class BubblingEventTargeter : public EventTargeter {
 363  public:
 364   explicit BubblingEventTargeter(TestEventTarget* initial_target)
 365     : initial_target_(initial_target) {}
 366   ~BubblingEventTargeter() override {}
 367
 368  private:
 369   // EventTargeter:
 370   EventTarget* FindTargetForEvent(EventTarget* root, Event* event) override {
 371     return initial_target_;
 372   }
 373
 374   EventTarget* FindNextBestTarget(EventTarget* previous_target,
 375                                   Event* event) override {
 376     return previous_target->GetParentTarget();
 377   }
 378
 379   TestEventTarget* initial_target_;
 380
 381   DISALLOW_COPY_AND_ASSIGN(BubblingEventTargeter);
 382 };
 383
 384 // Tests that unhandled events are correctly dispatched to the next-best
 385 // target as decided by the BubblingEventTargeter.
 386 TEST_F(EventProcessorTest, DispatchToNextBestTarget) {
 387   scoped_ptr<TestEventTarget> child(new TestEventTarget());
 388   scoped_ptr<TestEventTarget> grandchild(new TestEventTarget());
 389
 390   root()->SetEventTargeter(
 391       scoped_ptr<EventTargeter>(new BubblingEventTargeter(grandchild.get())));
 392   child->AddChild(grandchild.Pass());
 393   root()->AddChild(child.Pass());
 394
 395   ASSERT_EQ(1u, root()->child_count());
 396   ASSERT_EQ(1u, root()->child_at(0)->child_count());
 397   ASSERT_EQ(0u, root()->child_at(0)->child_at(0)->child_count());
 398
 399   TestEventTarget* child_r = root()->child_at(0);
 400   TestEventTarget* grandchild_r = child_r->child_at(0);
 401
 402   // When the root has a BubblingEventTargeter installed, events targeted
 403   // at the grandchild target should be dispatched to all three targets.
 404   KeyEvent key_event(ET_KEY_PRESSED, VKEY_ESCAPE, EF_NONE);
 405   DispatchEvent(&key_event);
 406   EXPECT_TRUE(root()->DidReceiveEvent(ET_KEY_PRESSED));
 407   EXPECT_TRUE(child_r->DidReceiveEvent(ET_KEY_PRESSED));
 408   EXPECT_TRUE(grandchild_r->DidReceiveEvent(ET_KEY_PRESSED));
 409   root()->ResetReceivedEvents();
 410   child_r->ResetReceivedEvents();
 411   grandchild_r->ResetReceivedEvents();
 412
 413   // Add a pre-target handler on the child of the root that will mark the event
 414   // as handled. No targets in the hierarchy should receive the event.
 415   TestEventHandler handler;
 416   child_r->AddPreTargetHandler(&handler);
 417   key_event = KeyEvent(ET_KEY_PRESSED, VKEY_ESCAPE, EF_NONE);
 418   DispatchEvent(&key_event);
 419   EXPECT_FALSE(root()->DidReceiveEvent(ET_KEY_PRESSED));
 420   EXPECT_FALSE(child_r->DidReceiveEvent(ET_KEY_PRESSED));
 421   EXPECT_FALSE(grandchild_r->DidReceiveEvent(ET_KEY_PRESSED));
 422   EXPECT_EQ(1, handler.num_key_events());
 423   handler.Reset();
 424
 425   // Add a post-target handler on the child of the root that will mark the event
 426   // as handled. Only the grandchild (the initial target) should receive the
 427   // event.
 428   child_r->RemovePreTargetHandler(&handler);
 429   child_r->AddPostTargetHandler(&handler);
 430   key_event = KeyEvent(ET_KEY_PRESSED, VKEY_ESCAPE, EF_NONE);
 431   DispatchEvent(&key_event);
 432   EXPECT_FALSE(root()->DidReceiveEvent(ET_KEY_PRESSED));
 433   EXPECT_FALSE(child_r->DidReceiveEvent(ET_KEY_PRESSED));
 434   EXPECT_TRUE(grandchild_r->DidReceiveEvent(ET_KEY_PRESSED));
 435   EXPECT_EQ(1, handler.num_key_events());
 436   handler.Reset();
 437   grandchild_r->ResetReceivedEvents();
 438   child_r->RemovePostTargetHandler(&handler);
 439
 440   // Mark the event as handled when it reaches the EP_TARGET phase of
 441   // dispatch at the child of the root. The child and grandchild
 442   // targets should both receive the event, but the root should not.
 443   child_r->set_mark_events_as_handled(true);
 444   key_event = KeyEvent(ET_KEY_PRESSED, VKEY_ESCAPE, EF_NONE);
 445   DispatchEvent(&key_event);
 446   EXPECT_FALSE(root()->DidReceiveEvent(ET_KEY_PRESSED));
 447   EXPECT_TRUE(child_r->DidReceiveEvent(ET_KEY_PRESSED));
 448   EXPECT_TRUE(grandchild_r->DidReceiveEvent(ET_KEY_PRESSED));
 449   root()->ResetReceivedEvents();
 450   child_r->ResetReceivedEvents();
 451   grandchild_r->ResetReceivedEvents();
 452   child_r->set_mark_events_as_handled(false);
 453 }
 454
 455 // Tests that unhandled events are seen by the correct sequence of
 456 // targets, pre-target handlers, and post-target handlers when
 457 // a BubblingEventTargeter is installed on the root target.
 458 TEST_F(EventProcessorTest, HandlerSequence) {
 459   scoped_ptr<TestEventTarget> child(new TestEventTarget());
 460   scoped_ptr<TestEventTarget> grandchild(new TestEventTarget());
 461
 462   root()->SetEventTargeter(
 463       scoped_ptr<EventTargeter>(new BubblingEventTargeter(grandchild.get())));
 464   child->AddChild(grandchild.Pass());
 465   root()->AddChild(child.Pass());
 466
 467   ASSERT_EQ(1u, root()->child_count());
 468   ASSERT_EQ(1u, root()->child_at(0)->child_count());
 469   ASSERT_EQ(0u, root()->child_at(0)->child_at(0)->child_count());
 470
 471   TestEventTarget* child_r = root()->child_at(0);
 472   TestEventTarget* grandchild_r = child_r->child_at(0);
 473
 474   HandlerSequenceRecorder recorder;
 475   root()->set_target_name("R");
 476   root()->set_recorder(&recorder);
 477   child_r->set_target_name("C");
 478   child_r->set_recorder(&recorder);
 479   grandchild_r->set_target_name("G");
 480   grandchild_r->set_recorder(&recorder);
 481
 482   TestEventHandler pre_root;
 483   pre_root.set_handler_name("PreR");
 484   pre_root.set_recorder(&recorder);
 485   root()->AddPreTargetHandler(&pre_root);
 486
 487   TestEventHandler pre_child;
 488   pre_child.set_handler_name("PreC");
 489   pre_child.set_recorder(&recorder);
 490   child_r->AddPreTargetHandler(&pre_child);
 491
 492   TestEventHandler pre_grandchild;
 493   pre_grandchild.set_handler_name("PreG");
 494   pre_grandchild.set_recorder(&recorder);
 495   grandchild_r->AddPreTargetHandler(&pre_grandchild);
 496
 497   TestEventHandler post_root;
 498   post_root.set_handler_name("PostR");
 499   post_root.set_recorder(&recorder);
 500   root()->AddPostTargetHandler(&post_root);
 501
 502   TestEventHandler post_child;
 503   post_child.set_handler_name("PostC");
 504   post_child.set_recorder(&recorder);
 505   child_r->AddPostTargetHandler(&post_child);
 506
 507   TestEventHandler post_grandchild;
 508   post_grandchild.set_handler_name("PostG");
 509   post_grandchild.set_recorder(&recorder);
 510   grandchild_r->AddPostTargetHandler(&post_grandchild);
 511
 512   MouseEvent mouse(ET_MOUSE_MOVED, gfx::Point(10, 10), gfx::Point(10, 10),
 513                    EF_NONE, EF_NONE);
 514   DispatchEvent(&mouse);
 515
 516   std::string expected[] = { "PreR", "PreC", "PreG", "G", "PostG", "PostC",
 517       "PostR", "PreR", "PreC", "C", "PostC", "PostR", "PreR", "R", "PostR" };
 518   EXPECT_EQ(std::vector<std::string>(
 519       expected, expected + arraysize(expected)), recorder);
 520 }
 521
 522 }  // namespace test
 523 }  // namespace ui