ui/events/test/event_generator.cc

   1 // Copyright 2014 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/test/event_generator.h"
   6
   7 #include "base/bind.h"
   8 #include "base/location.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/single_thread_task_runner.h"
  11 #include "base/thread_task_runner_handle.h"
  12 #include "base/time/tick_clock.h"
  13 #include "ui/events/event.h"
  14 #include "ui/events/event_source.h"
  15 #include "ui/events/event_utils.h"
  16 #include "ui/events/test/events_test_utils.h"
  17 #include "ui/gfx/geometry/vector2d_conversions.h"
  18
  19 #if defined(USE_X11)
  20 #include <X11/Xlib.h>
  21 #include "ui/events/test/events_test_utils_x11.h"
  22 #endif
  23
  24 #if defined(OS_WIN)
  25 #include "ui/events/keycodes/keyboard_code_conversion.h"
  26 #endif
  27
  28 namespace ui {
  29 namespace test {
  30 namespace {
  31
  32 void DummyCallback(EventType, const gfx::Vector2dF&) {
  33 }
  34
  35 class TestTickClock : public base::TickClock {
  36  public:
  37   // Starts off with a clock set to TimeTicks().
  38   TestTickClock() {}
  39
  40   base::TimeTicks NowTicks() override {
  41     return base::TimeTicks::FromInternalValue(ticks_++ * 1000);
  42   }
  43
  44  private:
  45   int64 ticks_ = 1;
  46
  47   DISALLOW_COPY_AND_ASSIGN(TestTickClock);
  48 };
  49
  50 class TestKeyEvent : public ui::KeyEvent {
  51  public:
  52   TestKeyEvent(const base::NativeEvent& native_event, int flags)
  53       : KeyEvent(native_event) {
  54     set_flags(flags);
  55   }
  56 };
  57
  58 class TestTouchEvent : public ui::TouchEvent {
  59  public:
  60   TestTouchEvent(ui::EventType type,
  61                  const gfx::Point& root_location,
  62                  int touch_id,
  63                  int flags,
  64                  base::TimeDelta timestamp)
  65       : TouchEvent(type, root_location, flags, touch_id, timestamp,
  66                    1.0f, 1.0f, 0.0f, 0.0f) {
  67   }
  68
  69  private:
  70   DISALLOW_COPY_AND_ASSIGN(TestTouchEvent);
  71 };
  72
  73 const int kAllButtonMask = ui::EF_LEFT_MOUSE_BUTTON | ui::EF_RIGHT_MOUSE_BUTTON;
  74
  75 }  // namespace
  76
  77 EventGeneratorDelegate* EventGenerator::default_delegate = NULL;
  78
  79 EventGenerator::EventGenerator(gfx::NativeWindow root_window)
  80     : current_target_(NULL),
  81       flags_(0),
  82       grab_(false),
  83       async_(false),
  84       targeting_application_(false),
  85       tick_clock_(new TestTickClock()) {
  86   Init(root_window, NULL);
  87 }
  88
  89 EventGenerator::EventGenerator(gfx::NativeWindow root_window,
  90                                const gfx::Point& point)
  91     : current_location_(point),
  92       current_target_(NULL),
  93       flags_(0),
  94       grab_(false),
  95       async_(false),
  96       targeting_application_(false),
  97       tick_clock_(new TestTickClock()) {
  98   Init(root_window, NULL);
  99 }
 100
 101 EventGenerator::EventGenerator(gfx::NativeWindow root_window,
 102                                gfx::NativeWindow window)
 103     : current_target_(NULL),
 104       flags_(0),
 105       grab_(false),
 106       async_(false),
 107       targeting_application_(false),
 108       tick_clock_(new TestTickClock()) {
 109   Init(root_window, window);
 110 }
 111
 112 EventGenerator::EventGenerator(EventGeneratorDelegate* delegate)
 113     : delegate_(delegate),
 114       current_target_(NULL),
 115       flags_(0),
 116       grab_(false),
 117       async_(false),
 118       targeting_application_(false),
 119       tick_clock_(new TestTickClock()) {
 120   Init(NULL, NULL);
 121 }
 122
 123 EventGenerator::~EventGenerator() {
 124   for (std::list<ui::Event*>::iterator i = pending_events_.begin();
 125       i != pending_events_.end(); ++i)
 126     delete *i;
 127   pending_events_.clear();
 128   delegate()->SetContext(NULL, NULL, NULL);
 129 }
 130
 131 void EventGenerator::PressLeftButton() {
 132   PressButton(ui::EF_LEFT_MOUSE_BUTTON);
 133 }
 134
 135 void EventGenerator::ReleaseLeftButton() {
 136   ReleaseButton(ui::EF_LEFT_MOUSE_BUTTON);
 137 }
 138
 139 void EventGenerator::ClickLeftButton() {
 140   PressLeftButton();
 141   ReleaseLeftButton();
 142 }
 143
 144 void EventGenerator::DoubleClickLeftButton() {
 145   flags_ &= ~ui::EF_IS_DOUBLE_CLICK;
 146   ClickLeftButton();
 147   flags_ |= ui::EF_IS_DOUBLE_CLICK;
 148   ClickLeftButton();
 149   flags_ &= ~ui::EF_IS_DOUBLE_CLICK;
 150 }
 151
 152 void EventGenerator::PressRightButton() {
 153   PressButton(ui::EF_RIGHT_MOUSE_BUTTON);
 154 }
 155
 156 void EventGenerator::ReleaseRightButton() {
 157   ReleaseButton(ui::EF_RIGHT_MOUSE_BUTTON);
 158 }
 159
 160 void EventGenerator::MoveMouseWheel(int delta_x, int delta_y) {
 161   gfx::Point location = GetLocationInCurrentRoot();
 162   ui::MouseEvent mouseev(ui::ET_MOUSEWHEEL, location, location,
 163                          ui::EventTimeForNow(), flags_, 0);
 164   ui::MouseWheelEvent wheelev(mouseev, delta_x, delta_y);
 165   Dispatch(&wheelev);
 166 }
 167
 168 void EventGenerator::SendMouseExit() {
 169   gfx::Point exit_location(current_location_);
 170   delegate()->ConvertPointToTarget(current_target_, &exit_location);
 171   ui::MouseEvent mouseev(ui::ET_MOUSE_EXITED, exit_location, exit_location,
 172                          ui::EventTimeForNow(), flags_, 0);
 173   Dispatch(&mouseev);
 174 }
 175
 176 void EventGenerator::MoveMouseToInHost(const gfx::Point& point_in_host) {
 177   const ui::EventType event_type = (flags_ & ui::EF_LEFT_MOUSE_BUTTON) ?
 178       ui::ET_MOUSE_DRAGGED : ui::ET_MOUSE_MOVED;
 179   ui::MouseEvent mouseev(event_type, point_in_host, point_in_host,
 180                          ui::EventTimeForNow(), flags_, 0);
 181   Dispatch(&mouseev);
 182
 183   current_location_ = point_in_host;
 184   delegate()->ConvertPointFromHost(current_target_, &current_location_);
 185 }
 186
 187 void EventGenerator::MoveMouseTo(const gfx::Point& point_in_screen,
 188                                  int count) {
 189   DCHECK_GT(count, 0);
 190   const ui::EventType event_type = (flags_ & ui::EF_LEFT_MOUSE_BUTTON) ?
 191       ui::ET_MOUSE_DRAGGED : ui::ET_MOUSE_MOVED;
 192
 193   gfx::Vector2dF diff(point_in_screen - current_location_);
 194   for (float i = 1; i <= count; i++) {
 195     gfx::Vector2dF step(diff);
 196     step.Scale(i / count);
 197     gfx::Point move_point = current_location_ + gfx::ToRoundedVector2d(step);
 198     if (!grab_)
 199       UpdateCurrentDispatcher(move_point);
 200     delegate()->ConvertPointToTarget(current_target_, &move_point);
 201     ui::MouseEvent mouseev(event_type, move_point, move_point,
 202                            ui::EventTimeForNow(), flags_, 0);
 203     Dispatch(&mouseev);
 204   }
 205   current_location_ = point_in_screen;
 206 }
 207
 208 void EventGenerator::MoveMouseRelativeTo(const EventTarget* window,
 209                                          const gfx::Point& point_in_parent) {
 210   gfx::Point point(point_in_parent);
 211   delegate()->ConvertPointFromTarget(window, &point);
 212   MoveMouseTo(point);
 213 }
 214
 215 void EventGenerator::DragMouseTo(const gfx::Point& point) {
 216   PressLeftButton();
 217   MoveMouseTo(point);
 218   ReleaseLeftButton();
 219 }
 220
 221 void EventGenerator::MoveMouseToCenterOf(EventTarget* window) {
 222   MoveMouseTo(CenterOfWindow(window));
 223 }
 224
 225 void EventGenerator::PressTouch() {
 226   PressTouchId(0);
 227 }
 228
 229 void EventGenerator::PressTouchId(int touch_id) {
 230   TestTouchEvent touchev(
 231       ui::ET_TOUCH_PRESSED, GetLocationInCurrentRoot(), touch_id, flags_,
 232       Now());
 233   Dispatch(&touchev);
 234 }
 235
 236 void EventGenerator::MoveTouch(const gfx::Point& point) {
 237   MoveTouchId(point, 0);
 238 }
 239
 240 void EventGenerator::MoveTouchId(const gfx::Point& point, int touch_id) {
 241   current_location_ = point;
 242   TestTouchEvent touchev(
 243       ui::ET_TOUCH_MOVED, GetLocationInCurrentRoot(), touch_id, flags_,
 244       Now());
 245   Dispatch(&touchev);
 246
 247   if (!grab_)
 248     UpdateCurrentDispatcher(point);
 249 }
 250
 251 void EventGenerator::ReleaseTouch() {
 252   ReleaseTouchId(0);
 253 }
 254
 255 void EventGenerator::ReleaseTouchId(int touch_id) {
 256   TestTouchEvent touchev(
 257       ui::ET_TOUCH_RELEASED, GetLocationInCurrentRoot(), touch_id, flags_,
 258       Now());
 259   Dispatch(&touchev);
 260 }
 261
 262 void EventGenerator::PressMoveAndReleaseTouchTo(const gfx::Point& point) {
 263   PressTouch();
 264   MoveTouch(point);
 265   ReleaseTouch();
 266 }
 267
 268 void EventGenerator::PressMoveAndReleaseTouchToCenterOf(EventTarget* window) {
 269   PressMoveAndReleaseTouchTo(CenterOfWindow(window));
 270 }
 271
 272 void EventGenerator::GestureEdgeSwipe() {
 273   ui::GestureEvent gesture(
 274       0, 0, 0, Now(), ui::GestureEventDetails(ui::ET_GESTURE_WIN8_EDGE_SWIPE));
 275   Dispatch(&gesture);
 276 }
 277
 278 void EventGenerator::GestureTapAt(const gfx::Point& location) {
 279   const int kTouchId = 2;
 280   ui::TouchEvent press(ui::ET_TOUCH_PRESSED,
 281                        location,
 282                        kTouchId,
 283                        Now());
 284   Dispatch(&press);
 285
 286   ui::TouchEvent release(
 287       ui::ET_TOUCH_RELEASED, location, kTouchId,
 288       press.time_stamp() + base::TimeDelta::FromMilliseconds(50));
 289   Dispatch(&release);
 290 }
 291
 292 void EventGenerator::GestureTapDownAndUp(const gfx::Point& location) {
 293   const int kTouchId = 3;
 294   ui::TouchEvent press(ui::ET_TOUCH_PRESSED,
 295                        location,
 296                        kTouchId,
 297                        Now());
 298   Dispatch(&press);
 299
 300   ui::TouchEvent release(
 301       ui::ET_TOUCH_RELEASED, location, kTouchId,
 302       press.time_stamp() + base::TimeDelta::FromMilliseconds(1000));
 303   Dispatch(&release);
 304 }
 305
 306 base::TimeDelta EventGenerator::CalculateScrollDurationForFlingVelocity(
 307     const gfx::Point& start,
 308     const gfx::Point& end,
 309     float velocity,
 310     int steps) {
 311   const float kGestureDistance = (start - end).Length();
 312   const float kFlingStepDelay = (kGestureDistance / velocity) / steps * 1000000;
 313   return base::TimeDelta::FromMicroseconds(kFlingStepDelay);
 314 }
 315
 316 void EventGenerator::GestureScrollSequence(const gfx::Point& start,
 317                                            const gfx::Point& end,
 318                                            const base::TimeDelta& step_delay,
 319                                            int steps) {
 320   GestureScrollSequenceWithCallback(start, end, step_delay, steps,
 321                                     base::Bind(&DummyCallback));
 322 }
 323
 324 void EventGenerator::GestureScrollSequenceWithCallback(
 325     const gfx::Point& start,
 326     const gfx::Point& end,
 327     const base::TimeDelta& step_delay,
 328     int steps,
 329     const ScrollStepCallback& callback) {
 330   const int kTouchId = 5;
 331   base::TimeDelta timestamp = Now();
 332   ui::TouchEvent press(ui::ET_TOUCH_PRESSED, start, kTouchId, timestamp);
 333   Dispatch(&press);
 334
 335   callback.Run(ui::ET_GESTURE_SCROLL_BEGIN, gfx::Vector2dF());
 336
 337   float dx = static_cast<float>(end.x() - start.x()) / steps;
 338   float dy = static_cast<float>(end.y() - start.y()) / steps;
 339   gfx::PointF location = start;
 340   for (int i = 0; i < steps; ++i) {
 341     location.Offset(dx, dy);
 342     timestamp += step_delay;
 343     ui::TouchEvent move(ui::ET_TOUCH_MOVED, location, kTouchId, timestamp);
 344     Dispatch(&move);
 345     callback.Run(ui::ET_GESTURE_SCROLL_UPDATE, gfx::Vector2dF(dx, dy));
 346   }
 347
 348   ui::TouchEvent release(ui::ET_TOUCH_RELEASED, end, kTouchId, timestamp);
 349   Dispatch(&release);
 350
 351   callback.Run(ui::ET_GESTURE_SCROLL_END, gfx::Vector2dF());
 352 }
 353
 354 void EventGenerator::GestureMultiFingerScroll(int count,
 355                                               const gfx::Point start[],
 356                                               int event_separation_time_ms,
 357                                               int steps,
 358                                               int move_x,
 359                                               int move_y) {
 360   const int kMaxTouchPoints = 10;
 361   int delays[kMaxTouchPoints] = { 0 };
 362   GestureMultiFingerScrollWithDelays(
 363       count, start, delays, event_separation_time_ms, steps, move_x, move_y);
 364 }
 365
 366 void EventGenerator::GestureMultiFingerScrollWithDelays(
 367     int count,
 368     const gfx::Point start[],
 369     const int delay_adding_finger_ms[],
 370     int event_separation_time_ms,
 371     int steps,
 372     int move_x,
 373     int move_y) {
 374   const int kMaxTouchPoints = 10;
 375   gfx::Point points[kMaxTouchPoints];
 376   CHECK_LE(count, kMaxTouchPoints);
 377   CHECK_GT(steps, 0);
 378
 379   int delta_x = move_x / steps;
 380   int delta_y = move_y / steps;
 381
 382   for (int i = 0; i < count; ++i) {
 383     points[i] = start[i];
 384   }
 385
 386   base::TimeDelta press_time_first = Now();
 387   base::TimeDelta press_time[kMaxTouchPoints];
 388   bool pressed[kMaxTouchPoints];
 389   for (int i = 0; i < count; ++i) {
 390     pressed[i] = false;
 391     press_time[i] = press_time_first +
 392         base::TimeDelta::FromMilliseconds(delay_adding_finger_ms[i]);
 393   }
 394
 395   int last_id = 0;
 396   for (int step = 0; step < steps; ++step) {
 397     base::TimeDelta move_time = press_time_first +
 398         base::TimeDelta::FromMilliseconds(event_separation_time_ms * step);
 399
 400     while (last_id < count &&
 401            !pressed[last_id] &&
 402            move_time >= press_time[last_id]) {
 403       ui::TouchEvent press(ui::ET_TOUCH_PRESSED,
 404                            points[last_id],
 405                            last_id,
 406                            press_time[last_id]);
 407       Dispatch(&press);
 408       pressed[last_id] = true;
 409       last_id++;
 410     }
 411
 412     for (int i = 0; i < count; ++i) {
 413       points[i].Offset(delta_x, delta_y);
 414       if (i >= last_id)
 415         continue;
 416       ui::TouchEvent move(ui::ET_TOUCH_MOVED, points[i], i, move_time);
 417       Dispatch(&move);
 418     }
 419   }
 420
 421   base::TimeDelta release_time = press_time_first +
 422       base::TimeDelta::FromMilliseconds(event_separation_time_ms * steps);
 423   for (int i = 0; i < last_id; ++i) {
 424     ui::TouchEvent release(
 425         ui::ET_TOUCH_RELEASED, points[i], i, release_time);
 426     Dispatch(&release);
 427   }
 428 }
 429
 430 void EventGenerator::ScrollSequence(const gfx::Point& start,
 431                                     const base::TimeDelta& step_delay,
 432                                     float x_offset,
 433                                     float y_offset,
 434                                     int steps,
 435                                     int num_fingers) {
 436   base::TimeDelta timestamp = Now();
 437   ui::ScrollEvent fling_cancel(ui::ET_SCROLL_FLING_CANCEL,
 438                                start,
 439                                timestamp,
 440                                0,
 441                                0, 0,
 442                                0, 0,
 443                                num_fingers);
 444   Dispatch(&fling_cancel);
 445
 446   float dx = x_offset / steps;
 447   float dy = y_offset / steps;
 448   for (int i = 0; i < steps; ++i) {
 449     timestamp += step_delay;
 450     ui::ScrollEvent move(ui::ET_SCROLL,
 451                          start,
 452                          timestamp,
 453                          0,
 454                          dx, dy,
 455                          dx, dy,
 456                          num_fingers);
 457     Dispatch(&move);
 458   }
 459
 460   ui::ScrollEvent fling_start(ui::ET_SCROLL_FLING_START,
 461                               start,
 462                               timestamp,
 463                               0,
 464                               x_offset, y_offset,
 465                               x_offset, y_offset,
 466                               num_fingers);
 467   Dispatch(&fling_start);
 468 }
 469
 470 void EventGenerator::ScrollSequence(const gfx::Point& start,
 471                                     const base::TimeDelta& step_delay,
 472                                     const std::vector<gfx::PointF>& offsets,
 473                                     int num_fingers) {
 474   size_t steps = offsets.size();
 475   base::TimeDelta timestamp = Now();
 476   ui::ScrollEvent fling_cancel(ui::ET_SCROLL_FLING_CANCEL,
 477                                start,
 478                                timestamp,
 479                                0,
 480                                0, 0,
 481                                0, 0,
 482                                num_fingers);
 483   Dispatch(&fling_cancel);
 484
 485   for (size_t i = 0; i < steps; ++i) {
 486     timestamp += step_delay;
 487     ui::ScrollEvent scroll(ui::ET_SCROLL,
 488                            start,
 489                            timestamp,
 490                            0,
 491                            offsets[i].x(), offsets[i].y(),
 492                            offsets[i].x(), offsets[i].y(),
 493                            num_fingers);
 494     Dispatch(&scroll);
 495   }
 496
 497   ui::ScrollEvent fling_start(ui::ET_SCROLL_FLING_START,
 498                               start,
 499                               timestamp,
 500                               0,
 501                               offsets[steps - 1].x(), offsets[steps - 1].y(),
 502                               offsets[steps - 1].x(), offsets[steps - 1].y(),
 503                               num_fingers);
 504   Dispatch(&fling_start);
 505 }
 506
 507 void EventGenerator::PressKey(ui::KeyboardCode key_code, int flags) {
 508   DispatchKeyEvent(true, key_code, flags);
 509 }
 510
 511 void EventGenerator::ReleaseKey(ui::KeyboardCode key_code, int flags) {
 512   DispatchKeyEvent(false, key_code, flags);
 513 }
 514
 515 void EventGenerator::Dispatch(ui::Event* event) {
 516   DoDispatchEvent(event, async_);
 517 }
 518
 519 void EventGenerator::SetTickClock(scoped_ptr<base::TickClock> tick_clock) {
 520   tick_clock_ = tick_clock.Pass();
 521 }
 522
 523 base::TimeDelta EventGenerator::Now() {
 524   // This is the same as what EventTimeForNow() does, but here we do it
 525   // with a tick clock that can be replaced with a simulated clock for tests.
 526   return base::TimeDelta::FromInternalValue(
 527       tick_clock_->NowTicks().ToInternalValue());
 528 }
 529
 530 void EventGenerator::Init(gfx::NativeWindow root_window,
 531                           gfx::NativeWindow window_context) {
 532   delegate()->SetContext(this, root_window, window_context);
 533   if (window_context)
 534     current_location_ = delegate()->CenterOfWindow(window_context);
 535   current_target_ = delegate()->GetTargetAt(current_location_);
 536 }
 537
 538 void EventGenerator::DispatchKeyEvent(bool is_press,
 539                                       ui::KeyboardCode key_code,
 540                                       int flags) {
 541 #if defined(OS_WIN)
 542   UINT key_press = WM_KEYDOWN;
 543   uint16 character = ui::DomCodeToUsLayoutCharacter(
 544       ui::UsLayoutKeyboardCodeToDomCode(key_code), flags);
 545   if (is_press && character) {
 546     MSG native_event = { NULL, WM_KEYDOWN, key_code, 0 };
 547     TestKeyEvent keyev(native_event, flags);
 548     Dispatch(&keyev);
 549     // On Windows, WM_KEYDOWN event is followed by WM_CHAR with a character
 550     // if the key event cooresponds to a real character.
 551     key_press = WM_CHAR;
 552     key_code = static_cast<ui::KeyboardCode>(character);
 553   }
 554   MSG native_event =
 555       { NULL, (is_press ? key_press : WM_KEYUP), key_code, 0 };
 556   native_event.time = Now().InMicroseconds();
 557   TestKeyEvent keyev(native_event, flags);
 558 #elif defined(USE_X11)
 559   ui::ScopedXI2Event xevent;
 560   xevent.InitKeyEvent(is_press ? ui::ET_KEY_PRESSED : ui::ET_KEY_RELEASED,
 561                       key_code,
 562                       flags);
 563   static_cast<XEvent*>(xevent)->xkey.time = Now().InMicroseconds();
 564   ui::KeyEvent keyev(xevent);
 565 #else
 566   ui::EventType type = is_press ? ui::ET_KEY_PRESSED : ui::ET_KEY_RELEASED;
 567   ui::KeyEvent keyev(type, key_code, flags);
 568 #endif  // OS_WIN
 569   Dispatch(&keyev);
 570 }
 571
 572 void EventGenerator::UpdateCurrentDispatcher(const gfx::Point& point) {
 573   current_target_ = delegate()->GetTargetAt(point);
 574 }
 575
 576 void EventGenerator::PressButton(int flag) {
 577   if (!(flags_ & flag)) {
 578     flags_ |= flag;
 579     grab_ = (flags_ & kAllButtonMask) != 0;
 580     gfx::Point location = GetLocationInCurrentRoot();
 581     ui::MouseEvent mouseev(ui::ET_MOUSE_PRESSED, location, location,
 582                            ui::EventTimeForNow(), flags_, flag);
 583     Dispatch(&mouseev);
 584   }
 585 }
 586
 587 void EventGenerator::ReleaseButton(int flag) {
 588   if (flags_ & flag) {
 589     gfx::Point location = GetLocationInCurrentRoot();
 590     ui::MouseEvent mouseev(ui::ET_MOUSE_RELEASED, location, location,
 591                            ui::EventTimeForNow(), flags_, flag);
 592     Dispatch(&mouseev);
 593     flags_ ^= flag;
 594   }
 595   grab_ = (flags_ & kAllButtonMask) != 0;
 596 }
 597
 598 gfx::Point EventGenerator::GetLocationInCurrentRoot() const {
 599   gfx::Point p(current_location_);
 600   delegate()->ConvertPointToTarget(current_target_, &p);
 601   return p;
 602 }
 603
 604 gfx::Point EventGenerator::CenterOfWindow(const EventTarget* window) const {
 605   return delegate()->CenterOfTarget(window);
 606 }
 607
 608 void EventGenerator::DoDispatchEvent(ui::Event* event, bool async) {
 609   if (async) {
 610     ui::Event* pending_event;
 611     if (event->IsKeyEvent()) {
 612       pending_event = new ui::KeyEvent(*static_cast<ui::KeyEvent*>(event));
 613     } else if (event->IsMouseEvent()) {
 614       pending_event = new ui::MouseEvent(*static_cast<ui::MouseEvent*>(event));
 615     } else if (event->IsTouchEvent()) {
 616       pending_event = new ui::TouchEvent(*static_cast<ui::TouchEvent*>(event));
 617     } else if (event->IsScrollEvent()) {
 618       pending_event =
 619           new ui::ScrollEvent(*static_cast<ui::ScrollEvent*>(event));
 620     } else {
 621       NOTREACHED() << "Invalid event type";
 622       return;
 623     }
 624     if (pending_events_.empty()) {
 625       base::ThreadTaskRunnerHandle::Get()->PostTask(
 626           FROM_HERE,
 627           base::Bind(&EventGenerator::DispatchNextPendingEvent,
 628                      base::Unretained(this)));
 629     }
 630     pending_events_.push_back(pending_event);
 631   } else {
 632     ui::EventSource* event_source = delegate()->GetEventSource(current_target_);
 633     ui::EventSourceTestApi event_source_test(event_source);
 634     ui::EventDispatchDetails details =
 635         event_source_test.SendEventToProcessor(event);
 636     CHECK(!details.dispatcher_destroyed);
 637   }
 638 }
 639
 640 void EventGenerator::DispatchNextPendingEvent() {
 641   DCHECK(!pending_events_.empty());
 642   ui::Event* event = pending_events_.front();
 643   DoDispatchEvent(event, false);
 644   pending_events_.pop_front();
 645   delete event;
 646   if (!pending_events_.empty()) {
 647     base::ThreadTaskRunnerHandle::Get()->PostTask(
 648         FROM_HERE,
 649         base::Bind(&EventGenerator::DispatchNextPendingEvent,
 650                    base::Unretained(this)));
 651   }
 652 }
 653
 654 const EventGeneratorDelegate* EventGenerator::delegate() const {
 655   if (delegate_)
 656     return delegate_.get();
 657
 658   DCHECK(default_delegate);
 659   return default_delegate;
 660 }
 661
 662 EventGeneratorDelegate* EventGenerator::delegate() {
 663   return const_cast<EventGeneratorDelegate*>(
 664       const_cast<const EventGenerator*>(this)->delegate());
 665 }
 666
 667 }  // namespace test
 668 }  // namespace ui