events: Add some test.

ui/base/events/event_dispatcher_unittest.cc

+// Copyright (c) 2012 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/base/events/event_dispatcher.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace ui {
+
+namespace {
+
+class TestEventDispatcher : public EventDispatcher {
+ public:
+  TestEventDispatcher() {}
+  virtual ~TestEventDispatcher() {}
+
+ private:
+  // Overridden from EventDispatcher:
+  virtual bool CanDispatchToTarget(EventTarget* target) OVERRIDE {
+    return true;
+  }
+
+  virtual void ProcessPreTargetList(EventHandlerList* list) OVERRIDE {
+  }
+
+  virtual void ProcessPostTargetList(EventHandlerList* list) OVERRIDE {
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(TestEventDispatcher);
+};
+
+class TestTarget : public EventTarget {
+ public:
+  TestTarget() : parent_(NULL) {}
+  virtual ~TestTarget() {}
+
+  void set_parent(TestTarget* parent) { parent_ = parent; }
+
+  void AddHandlerId(int id) {
+    handler_list_.push_back(id);
+  }
+
+  const std::vector<int>& handler_list() const { return handler_list_; }
+
+  void Reset() {
+    handler_list_.clear();
+  }
+
+ private:
+  // Overridden from EventTarget:
+  virtual bool CanAcceptEvents() OVERRIDE {
+    return true;
+  }
+
+  virtual EventTarget* GetParentTarget() OVERRIDE {
+    return parent_;
+  }
+
+  TestTarget* parent_;
+  std::vector<int> handler_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestTarget);
+};
+
+class TestEventHandler : public EventHandler {
+ public:
+  TestEventHandler(int id)
+      : id_(id),
+        event_result_(ER_UNHANDLED) {
+  }
+
+  virtual ~TestEventHandler() {}
+
+  void ReceivedEventForTarget(EventTarget* target) {
+    static_cast<TestTarget*>(target)->AddHandlerId(id_);
+  }
+
+  void set_event_result(EventResult result) { event_result_ = result; }
+
+ private:
+  // Overridden from EventHandler:
+  virtual EventResult OnKeyEvent(KeyEvent* event) OVERRIDE {
+    ReceivedEventForTarget(event->target());
+    return event_result_;
+  }
+
+  virtual EventResult OnMouseEvent(MouseEvent* event) OVERRIDE {
+    ReceivedEventForTarget(event->target());
+    return event_result_;
+  }
+
+  virtual EventResult OnScrollEvent(ScrollEvent* event) OVERRIDE {
+    ReceivedEventForTarget(event->target());
+    return event_result_;
+  }
+
+  virtual TouchStatus OnTouchEvent(TouchEvent* event) OVERRIDE {
+    ReceivedEventForTarget(event->target());
+    return ui::TOUCH_STATUS_UNKNOWN;
+  }
+
+  virtual EventResult OnGestureEvent(GestureEvent* event) OVERRIDE {
+    ReceivedEventForTarget(event->target());
+    return event_result_;
+  }
+
+  int id_;
+  EventResult event_result_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestEventHandler);
+};
+
+}  // namespace
+
+TEST(EventDispatcherTest, EventDispatchOrder) {
+  TestEventDispatcher dispatcher;
+  TestTarget parent, child;
+  TestEventHandler h1(1), h2(2), h3(3), h4(4);
+  TestEventHandler h5(5), h6(6), h7(7), h8(8);
+
+  child.set_parent(&parent);
+
+  parent.AddPreTargetHandler(&h1);
+  parent.AddPreTargetHandler(&h2);
+
+  child.AddPreTargetHandler(&h3);
+  child.AddPreTargetHandler(&h4);
+
+  child.AddPostTargetHandler(&h5);
+  child.AddPostTargetHandler(&h6);
+
+  parent.AddPostTargetHandler(&h7);
+  parent.AddPostTargetHandler(&h8);
+
+  ui::MouseEvent mouse(ui::ET_MOUSE_MOVED, gfx::Point(3, 4),
+      gfx::Point(3, 4), 0);
+  int result = dispatcher.ProcessEvent(&child, &mouse);
+  EXPECT_FALSE(result & ER_CONSUMED);
+  EXPECT_FALSE(result & ER_HANDLED);
+
+  // Note that the pre-handlers for the target itself (i.e. |child|) will not
+  // receive these events.

[Ben Goodger (Google), 2012/09/09 19:43:16]

Is this because you haven't made this behavioral change yet? If so, can you file
a bug and cite it here? This shouldn't be perceived as a permanent behavior.

[sadrul, 2012/09/10 05:04:01]

Indeed. I have filed a bug and referenced it from here. I am not entirely sure
if that change should happen for M23 though. I will put up a patch.

+  int expected[] = { 1, 2, 5, 6, 7, 8 };
+  EXPECT_EQ(
+      std::vector<int>(expected, expected + sizeof(expected) / sizeof(int)),
+      child.handler_list());
+
+  child.Reset();
+
+  h1.set_event_result(ER_HANDLED);
+  result = dispatcher.ProcessEvent(&child, &mouse);
+  EXPECT_FALSE(result & ER_CONSUMED);
+  EXPECT_TRUE(result & ER_HANDLED);
+  EXPECT_EQ(
+      std::vector<int>(expected, expected + sizeof(expected) / sizeof(int)),
+      child.handler_list());
+
+  child.Reset();
+
+  int nexpected[] = { 1, 2, 5 };
+  h5.set_event_result(ER_CONSUMED);
+  result = dispatcher.ProcessEvent(&child, &mouse);
+  EXPECT_TRUE(result & ER_CONSUMED);
+  EXPECT_TRUE(result & ER_HANDLED);
+  EXPECT_EQ(
+      std::vector<int>(nexpected, nexpected + sizeof(nexpected) / sizeof(int)),
+      child.handler_list());
+
+  child.Reset();
+
+  int exp[] = { 1 };
+  h1.set_event_result(ER_CONSUMED);
+  result = dispatcher.ProcessEvent(&child, &mouse);
+  EXPECT_TRUE(result & ER_CONSUMED);
+  EXPECT_FALSE(result & ER_HANDLED);
+  EXPECT_EQ(
+      std::vector<int>(exp, exp + sizeof(exp) / sizeof(int)),
+      child.handler_list());
+}
+
+}  // namespace ui