Add ability for EventGenerator to generate Scroll events asynchronously

ui/aura/test/event_generator.cc

Index: ui/aura/test/event_generator.cc
diff --git a/ui/aura/test/event_generator.cc b/ui/aura/test/event_generator.cc
index 42deba8e3723b3b401bd14471b05fabc72f40f81..106ac62358949fb3822d29b34da2a7ddc3eedc38 100644
--- a/ui/aura/test/event_generator.cc
+++ b/ui/aura/test/event_generator.cc
@@ -4,7 +4,9 @@
 
 #include "ui/aura/test/event_generator.h"
 
+#include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/message_loop_proxy.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/root_window.h"
 #include "ui/base/events/event.h"
@@ -75,7 +77,8 @@ EventGenerator::EventGenerator(RootWindow* root_window)
     : delegate_(new DefaultEventGeneratorDelegate(root_window)),
       current_root_window_(delegate_->GetRootWindowAt(current_location_)),
       flags_(0),
-      grab_(false) {
+      grab_(false),
+      post_events_(false) {
 }
 
 EventGenerator::EventGenerator(RootWindow* root_window, const gfx::Point& point)
@@ -83,7 +86,8 @@ EventGenerator::EventGenerator(RootWindow* root_window, const gfx::Point& point)
       current_location_(point),
       current_root_window_(delegate_->GetRootWindowAt(current_location_)),
       flags_(0),
-      grab_(false) {
+      grab_(false),
+      post_events_(false) {
 }
 
 EventGenerator::EventGenerator(RootWindow* root_window, Window* window)
@@ -91,14 +95,16 @@ EventGenerator::EventGenerator(RootWindow* root_window, Window* window)
       current_location_(CenterOfWindow(window)),
       current_root_window_(delegate_->GetRootWindowAt(current_location_)),
       flags_(0),
-      grab_(false) {
+      grab_(false),
+      post_events_(false) {
 }
 
 EventGenerator::EventGenerator(EventGeneratorDelegate* delegate)
     : delegate_(delegate),
       current_root_window_(delegate_->GetRootWindowAt(current_location_)),
       flags_(0),
-      grab_(false) {
+      grab_(false),
+      post_events_(false) {
 }
 
 EventGenerator::~EventGenerator() {
@@ -146,7 +152,7 @@ void EventGenerator::MoveMouseTo(const gfx::Point& point, int count) {
       UpdateCurrentRootWindow(move_point);
     ConvertPointToTarget(current_root_window_, &move_point);
     ui::MouseEvent mouseev(event_type, move_point, move_point, flags_);
-    Dispatch(mouseev);
+    Dispatch(&mouseev);
   }
   current_location_ = point;
 }
@@ -171,12 +177,12 @@ void EventGenerator::MoveMouseToCenterOf(Window* window) {
 void EventGenerator::PressTouch() {
   TestTouchEvent touchev(
       ui::ET_TOUCH_PRESSED, GetLocationInCurrentRoot(), flags_);
-  Dispatch(touchev);
+  Dispatch(&touchev);
 }
 
 void EventGenerator::MoveTouch(const gfx::Point& point) {
   TestTouchEvent touchev(ui::ET_TOUCH_MOVED, point, flags_);
-  Dispatch(touchev);
+  Dispatch(&touchev);
 
   current_location_ = point;
   if (!grab_)
@@ -186,7 +192,7 @@ void EventGenerator::MoveTouch(const gfx::Point& point) {
 void EventGenerator::ReleaseTouch() {
   TestTouchEvent touchev(
       ui::ET_TOUCH_RELEASED, GetLocationInCurrentRoot(), flags_);
-  Dispatch(touchev);
+  Dispatch(&touchev);
 }
 
 void EventGenerator::PressMoveAndReleaseTouchTo(const gfx::Point& point) {
@@ -205,12 +211,12 @@ void EventGenerator::GestureTapAt(const gfx::Point& location) {
                        location,
                        kTouchId,
                        ui::EventTimeForNow());
-  Dispatch(press);
+  Dispatch(&press);
 
   ui::TouchEvent release(
       ui::ET_TOUCH_RELEASED, location, kTouchId,
       press.time_stamp() + base::TimeDelta::FromMilliseconds(50));
-  Dispatch(release);
+  Dispatch(&release);
 }
 
 void EventGenerator::GestureTapDownAndUp(const gfx::Point& location) {
@@ -219,12 +225,12 @@ void EventGenerator::GestureTapDownAndUp(const gfx::Point& location) {
                        location,
                        kTouchId,
                        ui::EventTimeForNow());
-  Dispatch(press);
+  Dispatch(&press);
 
   ui::TouchEvent release(
       ui::ET_TOUCH_RELEASED, location, kTouchId,
       press.time_stamp() + base::TimeDelta::FromMilliseconds(1000));
-  Dispatch(release);
+  Dispatch(&release);
 }
 
 void EventGenerator::GestureScrollSequence(const gfx::Point& start,
@@ -234,7 +240,7 @@ void EventGenerator::GestureScrollSequence(const gfx::Point& start,
   const int kTouchId = 5;
   base::TimeDelta timestamp = ui::EventTimeForNow();
   ui::TouchEvent press(ui::ET_TOUCH_PRESSED, start, kTouchId, timestamp);
-  Dispatch(press);
+  Dispatch(&press);
 
   int dx = (end.x() - start.x()) / steps;
   int dy = (end.y() - start.y()) / steps;
@@ -243,11 +249,11 @@ void EventGenerator::GestureScrollSequence(const gfx::Point& start,
     location.Offset(dx, dy);
     timestamp += step_delay;
     ui::TouchEvent move(ui::ET_TOUCH_MOVED, location, kTouchId, timestamp);
-    Dispatch(move);
+    Dispatch(&move);
   }
 
   ui::TouchEvent release(ui::ET_TOUCH_RELEASED, end, kTouchId, timestamp);
-  Dispatch(release);
+  Dispatch(&release);
 }
 
 void EventGenerator::GestureMultiFingerScroll(int count,
@@ -268,7 +274,7 @@ void EventGenerator::GestureMultiFingerScroll(int count,
   for (int i = 0; i < count; ++i) {
     points[i] = start[i];
     ui::TouchEvent press(ui::ET_TOUCH_PRESSED, points[i], i, press_time);
-    Dispatch(press);
+    Dispatch(&press);
   }
 
   for (int step = 0; step < steps; ++step) {
@@ -277,7 +283,7 @@ void EventGenerator::GestureMultiFingerScroll(int count,
     for (int i = 0; i < count; ++i) {
       points[i].Offset(delta_x, delta_y);
       ui::TouchEvent move(ui::ET_TOUCH_MOVED, points[i], i, move_time);
-      Dispatch(move);
+      Dispatch(&move);
     }
   }
 
@@ -286,10 +292,88 @@ void EventGenerator::GestureMultiFingerScroll(int count,
   for (int i = 0; i < count; ++i) {
     ui::TouchEvent release(
         ui::ET_TOUCH_RELEASED, points[i], i, release_time);
-    Dispatch(release);
+    Dispatch(&release);
   }
 }
 
+void EventGenerator::ScrollSequence(const gfx::Point& start,
+                                    const base::TimeDelta& step_delay,
+                                    float x_offset,
+                                    float y_offset,
+                                    int steps,
+                                    int num_fingers) {
+  base::TimeDelta timestamp = base::TimeDelta::FromInternalValue(
+      base::TimeTicks::Now().ToInternalValue());
+  ui::ScrollEvent fling_cancel(ui::ET_SCROLL_FLING_CANCEL,
+                               start,
+                               timestamp,
+                               0,
+                               0,
+                               0,
+                               num_fingers);
+  Dispatch(&fling_cancel);
+
+  float dx = x_offset / steps;
+  float dy = y_offset / steps;
+  for (int i = 0; i < steps; ++i) {
+    timestamp += step_delay;
+    ui::ScrollEvent move(ui::ET_SCROLL,
+                         start,
+                         timestamp,
+                         0,
+                         dx,
+                         dy,
+                         num_fingers);
+    Dispatch(&move);
+  }
+
+  ui::ScrollEvent fling_start(ui::ET_SCROLL_FLING_START,
+                              start,
+                              timestamp,
+                              0,
+                              x_offset,
+                              y_offset,
+                              num_fingers);
+  Dispatch(&fling_start);
+}
+
+void EventGenerator::ScrollSequence(const gfx::Point& start,
+                                    const base::TimeDelta& step_delay,
+                                    const std::vector<gfx::Point>& offsets,
+                                    int num_fingers) {
+  int steps = offsets.size();
+  base::TimeDelta timestamp = ui::EventTimeForNow();
+  ui::ScrollEvent fling_cancel(ui::ET_SCROLL_FLING_CANCEL,
+                               start,
+                               timestamp,
+                               0,
+                               0,
+                               0,
+                               num_fingers);
+  Dispatch(&fling_cancel);
+
+  for (int i = 0; i < steps; ++i) {
+    timestamp += step_delay;
+    ui::ScrollEvent scroll(ui::ET_SCROLL,
+                           start,
+                           timestamp,
+                           0,
+                           offsets[i].x(),
+                           offsets[i].y(),
+                           num_fingers);
+    Dispatch(&scroll);
+  }
+
+  ui::ScrollEvent fling_start(ui::ET_SCROLL_FLING_START,
+                              start,
+                              timestamp,
+                              0,
+                              offsets[steps - 1].x(),
+                              offsets[steps - 1].y(),
+                              num_fingers);
+  Dispatch(&fling_start);
+}
+
 void EventGenerator::PressKey(ui::KeyboardCode key_code, int flags) {
   DispatchKeyEvent(true, key_code, flags);
 }
@@ -298,35 +382,8 @@ void EventGenerator::ReleaseKey(ui::KeyboardCode key_code, int flags) {
   DispatchKeyEvent(false, key_code, flags);
 }
 
-void EventGenerator::Dispatch(ui::Event& event) {
-  switch (event.type()) {
-    case ui::ET_KEY_PRESSED:
-    case ui::ET_KEY_RELEASED:
-      current_root_window_->AsRootWindowHostDelegate()->OnHostKeyEvent(
-          static_cast<ui::KeyEvent*>(&event));
-      break;
-    case ui::ET_MOUSE_PRESSED:
-    case ui::ET_MOUSE_DRAGGED:
-    case ui::ET_MOUSE_RELEASED:
-    case ui::ET_MOUSE_MOVED:
-    case ui::ET_MOUSE_ENTERED:
-    case ui::ET_MOUSE_EXITED:
-    case ui::ET_MOUSEWHEEL:
-      current_root_window_->AsRootWindowHostDelegate()->OnHostMouseEvent(
-          static_cast<ui::MouseEvent*>(&event));
-      break;
-    case ui::ET_TOUCH_RELEASED:
-    case ui::ET_TOUCH_PRESSED:
-    case ui::ET_TOUCH_MOVED:
-    case ui::ET_TOUCH_STATIONARY:
-    case ui::ET_TOUCH_CANCELLED:
-      current_root_window_->AsRootWindowHostDelegate()->OnHostTouchEvent(
-          static_cast<ui::TouchEvent*>(&event));
-      break;
-    default:
-      NOTIMPLEMENTED();
-      break;
-  }
+void EventGenerator::Dispatch(ui::Event* event) {
+  DoDispatchEvent(event, post_events_);
 }
 
 void EventGenerator::DispatchKeyEvent(bool is_press,
@@ -338,7 +395,7 @@ void EventGenerator::DispatchKeyEvent(bool is_press,
   if (is_press && character) {
     MSG native_event = { NULL, WM_KEYDOWN, key_code, 0 };
     TestKeyEvent keyev(native_event, flags, false);
-    Dispatch(keyev);
+    DispatchKeyEvent(keyev);
     // On Windows, WM_KEYDOWN event is followed by WM_CHAR with a character
     // if the key event cooresponds to a real character.
     key_press = WM_CHAR;
@@ -357,7 +414,7 @@ void EventGenerator::DispatchKeyEvent(bool is_press,
   ui::KeyEvent keyev(type, key_code, flags, false);
 #endif  // USE_X11
 #endif  // OS_WIN
-  Dispatch(keyev);
+  Dispatch(&keyev);
 }
 
 void EventGenerator::UpdateCurrentRootWindow(const gfx::Point& point) {
@@ -370,7 +427,7 @@ void EventGenerator::PressButton(int flag) {
     grab_ = flags_ & kAllButtonMask;
     gfx::Point location = GetLocationInCurrentRoot();
     ui::MouseEvent mouseev(ui::ET_MOUSE_PRESSED, location, location, flags_);
-    Dispatch(mouseev);
+    Dispatch(&mouseev);
   }
 }
 
@@ -379,7 +436,7 @@ void EventGenerator::ReleaseButton(int flag) {
     gfx::Point location = GetLocationInCurrentRoot();
     ui::MouseEvent mouseev(ui::ET_MOUSE_RELEASED, location,
                            location, flags_);
-    Dispatch(mouseev);
+    Dispatch(&mouseev);
     flags_ ^= flag;
   }
   grab_ = flags_ & kAllButtonMask;
@@ -419,5 +476,64 @@ gfx::Point EventGenerator::CenterOfWindow(const Window* window) const {
   return center;
 }
 
+void EventGenerator::DoDispatchEvent(ui::Event* event, bool post_event) {
+  if (post_event) {
+    ui::Event* pending_event;
+    if (event->IsKeyEvent()) {
+      pending_event = new ui::KeyEvent(*static_cast<ui::KeyEvent*>(event));
+    } else if (event->IsMouseEvent()) {
+      pending_event = new ui::MouseEvent(*static_cast<ui::MouseEvent*>(event));
+    } else if (event->IsTouchEvent()) {
+      pending_event = new ui::TouchEvent(*static_cast<ui::TouchEvent*>(event));
+    } else if (event->IsScrollEvent()) {
+      pending_event =
+          new ui::ScrollEvent(*static_cast<ui::ScrollEvent*>(event));
+    } else {
+      NOTREACHED() << "Invalid event type";
+      return;
+    }
+    if (pending_events_.empty()) {
+      base::MessageLoopProxy::current()->PostTask(
+          FROM_HERE,
+          base::Bind(&EventGenerator::DispatchNextPendingEvent,
+                     base::Unretained(this)));
+    }
+    pending_events_.push_back(pending_event);
+  } else {
+    RootWindowHostDelegate* root_window_host_delegate =
+        current_root_window_->AsRootWindowHostDelegate();
+    if (event->IsKeyEvent()) {
+      root_window_host_delegate->OnHostKeyEvent(
+          static_cast<ui::KeyEvent*>(event));
+    } else if (event->IsMouseEvent()) {
+      root_window_host_delegate->OnHostMouseEvent(
+          static_cast<ui::MouseEvent*>(event));
+    } else if (event->IsTouchEvent()) {
+      root_window_host_delegate->OnHostTouchEvent(
+          static_cast<ui::TouchEvent*>(event));
+    } else if (event->IsScrollEvent()) {
+      root_window_host_delegate->OnHostScrollEvent(
+          static_cast<ui::ScrollEvent*>(event));
+    } else {
+      NOTREACHED() << "Invalid event type";
+    }
+  }
+}
+
+void EventGenerator::DispatchNextPendingEvent() {
+  DCHECK(!pending_events_.empty());
+  ui::Event* event = pending_events_.front();
+  DoDispatchEvent(event, false);
+  pending_events_.pop_front();
+  delete event;
+  if (!pending_events_.empty()) {
+    base::MessageLoopProxy::current()->PostTask(
+        FROM_HERE,
+        base::Bind(&EventGenerator::DispatchNextPendingEvent,
+                   base::Unretained(this)));
+  }
+}
+
+
 }  // namespace test
 }  // namespace aura