Update ui::PointerEvent to support mouse wheel and capture change events.

ash/aura/pointer_watcher_adapter_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/wm_shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ui/events/base_event_utils.h"
 #include "ui/events/event.h"
 #include "ui/events/test/event_generator.h"
 #include "ui/views/pointer_watcher.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 
 using PointerWatcherAdapterTest = test::AshTestBase;
 
-// Records calls to OnPointerEventObserved() in |pointer_event_count_| and
-// calls to OnMouseCaptureChanged() to |capture_changed_count_|.
+// Records calls to OnPointerEventObserved() in |mouse_wheel_event_count| for a
+// mouse wheel event, in |capture_changed_count_| for a mouse capture change
+// event and in |pointer_event_count_| for all other pointer events.
 class TestPointerWatcher : public views::PointerWatcher {
  public:
   explicit TestPointerWatcher(bool wants_moves) {
     WmShell::Get()->AddPointerWatcher(this, wants_moves);
   }
   ~TestPointerWatcher() override { WmShell::Get()->RemovePointerWatcher(this); }
 
-  void ClearCounts() { pointer_event_count_ = capture_changed_count_ = 0; }
+  void ClearCounts() {
+    pointer_event_count_ = capture_changed_count_ = mouse_wheel_event_count_ =
+        0;
+  }
 
   int pointer_event_count() const { return pointer_event_count_; }
   int capture_changed_count() const { return capture_changed_count_; }
+  int mouse_wheel_event_count() const { return mouse_wheel_event_count_; }
 
   // views::PointerWatcher:
   void OnPointerEventObserved(const ui::PointerEvent& event,
                               const gfx::Point& location_in_screen,
                               views::Widget* target) override {
-    pointer_event_count_++;
+    if (event.type() == ui::ET_POINTER_WHEEL_CHANGED)
+      mouse_wheel_event_count_++;
+    else if (event.type() == ui::ET_POINTER_CAPTURE_CHANGED)
+      capture_changed_count_++;
+    else
+      pointer_event_count_++;
   }
-  void OnMouseCaptureChanged() override { capture_changed_count_++; }
 
  private:
   int pointer_event_count_ = 0;
   int capture_changed_count_ = 0;
+  int mouse_wheel_event_count_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(TestPointerWatcher);
 };
 
 // Creates two TestPointerWatchers, one that wants moves and one that doesn't.
 class TestHelper {
  public:
   TestHelper() : non_move_watcher_(false), move_watcher_(true) {}
   ~TestHelper() {}
 
   // Used to verify call counts.
   void ExpectCallCount(int non_move_pointer_event_count,
                        int non_move_capture_changed_count,
+                       int non_move_mouse_wheel_event_count,
                        int move_pointer_event_count,
-                       int move_capture_changed_count) {
+                       int move_capture_changed_count,
+                       int move_mouse_wheel_event_count) {
     EXPECT_EQ(non_move_pointer_event_count,
               non_move_watcher_.pointer_event_count());
     EXPECT_EQ(non_move_capture_changed_count,
               non_move_watcher_.capture_changed_count());
+    EXPECT_EQ(non_move_mouse_wheel_event_count,
+              non_move_watcher_.mouse_wheel_event_count());
     EXPECT_EQ(move_pointer_event_count, move_watcher_.pointer_event_count());
     EXPECT_EQ(move_capture_changed_count,
               move_watcher_.capture_changed_count());
+    EXPECT_EQ(move_mouse_wheel_event_count,
+              move_watcher_.mouse_wheel_event_count());
 
     non_move_watcher_.ClearCounts();
     move_watcher_.ClearCounts();
   }
 
  private:
   TestPointerWatcher non_move_watcher_;
   TestPointerWatcher move_watcher_;
 
   DISALLOW_COPY_AND_ASSIGN(TestHelper);
 };
 
 TEST_F(PointerWatcherAdapterTest, MouseEvents) {
   TestHelper helper;
 
   // Move: only the move PointerWatcher should get the event.
   GetEventGenerator().MoveMouseTo(gfx::Point(10, 10));
-  helper.ExpectCallCount(0, 0, 1, 0);
+  helper.ExpectCallCount(0, 0, 0, 1, 0, 0);
 
   // Press: both.
   GetEventGenerator().PressLeftButton();
-  helper.ExpectCallCount(1, 0, 1, 0);
+  helper.ExpectCallCount(1, 0, 0, 1, 0, 0);
 
   // Drag: none.
   GetEventGenerator().MoveMouseTo(gfx::Point(20, 30));
-  helper.ExpectCallCount(0, 0, 0, 0);
+  helper.ExpectCallCount(0, 0, 0, 0, 0, 0);
 
   // Release: both (aura generates a capture event here).
   GetEventGenerator().ReleaseLeftButton();
-  helper.ExpectCallCount(1, 1, 1, 1);
+  helper.ExpectCallCount(1, 1, 0, 1, 1, 0);
 
   // Exit: none.
   GetEventGenerator().SendMouseExit();
-  helper.ExpectCallCount(0, 0, 0, 0);
+  helper.ExpectCallCount(0, 0, 0, 0, 0, 0);
 
   // Enter: none.
   ui::MouseEvent enter_event(ui::ET_MOUSE_ENTERED, gfx::Point(), gfx::Point(),
                              ui::EventTimeForNow(), 0, 0);
   GetEventGenerator().Dispatch(&enter_event);
-  helper.ExpectCallCount(0, 0, 0, 0);
+  helper.ExpectCallCount(0, 0, 0, 0, 0, 0);
 
-  // Wheel: none
+  // Wheel: both
   GetEventGenerator().MoveMouseWheel(10, 11);
-  helper.ExpectCallCount(0, 0, 0, 0);
+  helper.ExpectCallCount(0, 0, 1, 0, 0, 1);
 
   // Capture: both.
   ui::MouseEvent capture_event(ui::ET_MOUSE_CAPTURE_CHANGED, gfx::Point(),
                                gfx::Point(), ui::EventTimeForNow(), 0, 0);
   GetEventGenerator().Dispatch(&capture_event);
-  helper.ExpectCallCount(0, 1, 0, 1);
+  helper.ExpectCallCount(0, 1, 0, 0, 1, 0);
 }
 
 TEST_F(PointerWatcherAdapterTest, TouchEvents) {
   TestHelper helper;
 
   // Press: both.
   const int touch_id = 11;
   GetEventGenerator().PressTouchId(touch_id);
-  helper.ExpectCallCount(1, 0, 1, 0);
+  helper.ExpectCallCount(1, 0, 0, 1, 0, 0);
 
   // Drag: none.
   GetEventGenerator().MoveTouchId(gfx::Point(20, 30), touch_id);
-  helper.ExpectCallCount(0, 0, 0, 0);
+  helper.ExpectCallCount(0, 0, 0, 0, 0, 0);
 
   // Release: both (contrary to mouse above, touch does not implicitly generate
   // capture).
   GetEventGenerator().ReleaseTouchId(touch_id);
-  helper.ExpectCallCount(1, 0, 1, 0);
+  helper.ExpectCallCount(1, 0, 0, 1, 0, 0);
 }
 
 }  // namespace ash