mus: Add EventObserver to allow passively listening to UI events

components/mus/ws/event_matcher_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 "components/mus/ws/event_matcher.h"
+
+#include "base/time/time.h"
+#include "components/mus/public/interfaces/input_event_matcher.mojom.h"
+#include "components/mus/public/interfaces/input_key_codes.mojom.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/events/event.h"
+#include "ui/gfx/geometry/point.h"
+
+namespace mus {
+namespace ws {
+
+// NOTE: Most of the matching functionality is exercised by tests of Accelerator
+// handling in the EventDispatcher and WindowTree tests. These are just basic
+// sanity checks.
+
+using EventTesterTest = testing::Test;
+
+TEST_F(EventTesterTest, MatchesEventByType) {
+  mojom::EventMatcherPtr matcher = mojom::EventMatcher::New();
+  matcher->type_matcher = mojom::EventTypeMatcher::New();
+  matcher->type_matcher->type = mojom::EventType::POINTER_DOWN;
+  EventMatcher pointer_down_matcher(*matcher);
+
+  ui::PointerEvent pointer_down(
+      ui::TouchEvent(ui::ET_TOUCH_PRESSED, gfx::Point(), 1, base::TimeDelta()));
+  EXPECT_TRUE(pointer_down_matcher.MatchesEvent(pointer_down));
+
+  ui::PointerEvent pointer_up(ui::TouchEvent(
+      ui::ET_TOUCH_RELEASED, gfx::Point(), 1, base::TimeDelta()));
+  EXPECT_FALSE(pointer_down_matcher.MatchesEvent(pointer_up));
+}
+
+TEST_F(EventTesterTest, MatchesEventByKeyCode) {
+  mojom::EventMatcherPtr matcher(mojom::EventMatcher::New());
+  matcher->type_matcher = mojom::EventTypeMatcher::New();
+  matcher->type_matcher->type = mojom::EventType::KEY_PRESSED;
+  matcher->key_matcher = mojom::KeyEventMatcher::New();
+  matcher->key_matcher->keyboard_code = mojom::KeyboardCode::Z;
+  EventMatcher z_matcher(*matcher);
+
+  ui::KeyEvent z_key(ui::ET_KEY_PRESSED, ui::VKEY_Z, ui::EF_NONE);
+  EXPECT_TRUE(z_matcher.MatchesEvent(z_key));
+
+  ui::KeyEvent y_key(ui::ET_KEY_PRESSED, ui::VKEY_Y, ui::EF_NONE);
+  EXPECT_FALSE(z_matcher.MatchesEvent(y_key));
+}
+
+TEST_F(EventTesterTest, MatchesEventByKeyFlags) {
+  mojom::EventMatcherPtr matcher(mojom::EventMatcher::New());
+  matcher->type_matcher = mojom::EventTypeMatcher::New();
+  matcher->type_matcher->type = mojom::EventType::KEY_PRESSED;
+  matcher->flags_matcher = mojom::EventFlagsMatcher::New();
+  matcher->flags_matcher->flags = mojom::kEventFlagControlDown;
+  matcher->key_matcher = mojom::KeyEventMatcher::New();
+  matcher->key_matcher->keyboard_code = mojom::KeyboardCode::N;
+  EventMatcher control_n_matcher(*matcher);
+
+  ui::KeyEvent control_n(ui::ET_KEY_PRESSED, ui::VKEY_N, ui::EF_CONTROL_DOWN);
+  EXPECT_TRUE(control_n_matcher.MatchesEvent(control_n));
+
+  ui::KeyEvent shift_n(ui::ET_KEY_PRESSED, ui::VKEY_N, ui::EF_SHIFT_DOWN);
+  EXPECT_FALSE(control_n_matcher.MatchesEvent(shift_n));
+}
+
+}  // namespace ws
+}  // namespace mus