MacViews: Create abstraction for event monitoring

ui/views/event_monitor_mac_unittest.mm

Index: ui/views/event_monitor_mac_unittest.mm
diff --git a/ui/views/event_monitor_mac_unittest.mm b/ui/views/event_monitor_mac_unittest.mm
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+++ b/ui/views/event_monitor_mac_unittest.mm
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+// Copyright 2014 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 "ui/views/event_monitor_mac.h"
+
+#include "ui/events/event.h"
+#include "ui/events/event_handler.h"
+#include "ui/events/event_constants.h"
+#import "ui/events/test/cocoa_test_event_utils.h"
+#import "ui/gfx/test/ui_cocoa_test_helper.h"
+
+namespace views {
+
+namespace {
+
+class EventMonitorMacTest : public ui::CocoaTest {
+ public:
+  EventMonitorMacTest() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(EventMonitorMacTest);
+};
+
+class EventCounter : public ui::EventHandler {
+ public:
+   EventCounter() : event_count_(0), last_event_type_(ui::ET_UNKNOWN) {}
+   int event_count() const { return event_count_; }
+   ui::EventType last_event_type() { return last_event_type_; }
+
+  // ui::EventHandler implementation:
+  virtual void OnEvent(ui::Event* event) override {
+    ++event_count_;
+    last_event_type_ = event->type();
+  }
+
+ private:
+  int event_count_;
+  ui::EventType last_event_type_;
+};
+
+}  // namespace
+
+TEST_F(EventMonitorMacTest, CountEvents) {
+  EventCounter counter;
+  NSEvent* event =
+      cocoa_test_event_utils::EnterExitEventWithType(NSMouseExited);
+
+  // No monitor installed yet, should not receive events.
+  [NSApp sendEvent:event];
+  EXPECT_EQ(0, counter.event_count());
+  EXPECT_EQ(ui::ET_UNKNOWN, counter.last_event_type());
+
+  // Install monitor, should start receiving event.
+  scoped_ptr<EventMonitor> event_monitor(EventMonitor::Create(&counter));
+  [NSApp sendEvent:event];
+  EXPECT_EQ(1, counter.event_count());
+  EXPECT_EQ(ui::ET_MOUSE_EXITED, counter.last_event_type());
+
+  // Uninstall monitor, should stop receiving events.
+  event_monitor.reset();
+  [NSApp sendEvent:event];
+  EXPECT_EQ(1, counter.event_count());
+  EXPECT_EQ(ui::ET_MOUSE_EXITED, counter.last_event_type());
+}
+
+}  // namespace views