ViewRoot class for event forwarding on Android

ui/android/view_android_unittest.cc

+// Copyright 2017 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 "testing/gtest/include/gtest/gtest.h"
+#include "ui/android/view_root.h"
+
+namespace ui {
+
+using base::android::JavaParamRef;
+
+class TestViewRoot : public ViewRoot {
+ public:
+  TestViewRoot() : ViewRoot(0L) {}
+  float GetDipScale() override { return 1.f; }
+};
+
+class TestViewClient : public ViewClient {
+ public:
+  TestViewClient() : handle_event_(true),
+                     called_(false) {}
+
+  void SetHandleEvent(bool handle_event) { handle_event_ = handle_event; }
+  bool OnTouchEvent(const MotionEventData& event) override {
+    called_ = true;
+    return handle_event_;
+  }
+
+  bool EventHandled() { return called_ && handle_event_; }
+  void Reset() { called_ = false; }
+
+ private:
+  bool handle_event_;  // Marks as event was consumed. True by default.
+  bool called_;
+};
+
+class ViewAndroidBoundsTest : public testing::Test {
+ public:
+  ViewAndroidBoundsTest() : view1_(&client1_),
+                            view2_(&client2_),
+                            view3_(&client3_) {}
+  void Reset() {
+    client1_.Reset();
+    client2_.Reset();
+    client3_.Reset();
+  }
+
+  void GenerateTouchEventAt(float x, float y) {
+    root_.OnTouchEvent(nullptr,
+                       JavaParamRef<jobject>(nullptr),
+                       JavaParamRef<jobject>(nullptr),
+                       0L, // time
+                       0, 1, 0, 0,
+                       x, y, 0.f, 0.f, // pos
+                       0, 0,  // pointer_id
+                       0.f, 0.f, 0.f, 0.f,  // touch
+                       0.f, 0.f, 0.f, 0.f,
+                       0.f, 0.f,
+                       0, 0, 0, 0,
+                       false);
+  }
+
+  TestViewRoot root_;
+  TestViewClient client1_;
+  TestViewClient client2_;
+  TestViewClient client3_;
+  ViewAndroid view1_;
+  ViewAndroid view2_;
+  ViewAndroid view3_;
+};
+
+TEST_F(ViewAndroidBoundsTest, MatchesViewInFront) {
+  view1_.SetBounds(gfx::Point(50, 50), 400, 600);
+  view2_.SetBounds(gfx::Point(50, 50), 400, 600);
+  root_.AddChild(&view2_);
+  root_.AddChild(&view1_);
+
+  // root
+  //   +-------+

[boliu, 2017/01/24 23:47:13]

err, first I got confused this is a diagram of coordinates

I think the tree structure ones are overkill, pretty each to see how the tree is
constructed

[Jinsuk Kim, 2017/01/25 02:34:34]

Removed diagrams.

+  //   |       |
+  // view1_  view2_
+
+  GenerateTouchEventAt(100.f, 100.f);
+  EXPECT_TRUE(client1_.EventHandled());

[boliu, 2017/01/24 23:47:13]

check view2 did not handle event, here and everywhere else

[Jinsuk Kim, 2017/01/25 02:34:34]

Done.

+
+  Reset();
+
+  // View 2 moves up to front, and events should hit it from now.
+  root_.MoveToFront(&view2_);
+  GenerateTouchEventAt(100.f, 100.f);
+
+  EXPECT_TRUE(client2_.EventHandled());
+}
+
+TEST_F(ViewAndroidBoundsTest, MatchesViewArea) {
+  //  +----------------+
+  //  |  view2_        |
+  //  |                |
+  //  |   +--------+   |
+  //  |   | x      |   | -> (100, 100)
+  //  |   | view1_ |   |
+  //  |   |        |   |
+  //  |   +--------+   |
+  //  |             x  | -> (300, 400)
+  //  +----------------+
+  view1_.SetBounds(gfx::Point(50, 50), 200, 200);
+  view2_.SetBounds(gfx::Point(20, 20), 400, 600);
+
+  // root
+  //   +-------+
+  //   |       |
+  // view1_  view2_
+  root_.AddChild(&view2_);
+  root_.AddChild(&view1_);
+
+  // Falls within |view1_|'s bounds
+  GenerateTouchEventAt(100.f, 100.f);
+  EXPECT_TRUE(client1_.EventHandled());
+  Reset();
+
+  // Falls within |view2_|'s bounds
+  GenerateTouchEventAt(300.f, 400.f);
+  EXPECT_TRUE(client2_.EventHandled());
+}
+
+TEST_F(ViewAndroidBoundsTest, MatchesViewAfterMove) {
+  //  +----------------+
+  //  |  view2_        |
+  //  |                |
+  //  |   +--------+   |
+  //  |   | x      |   | -> (100, 100)
+  //  |   |        |   |
+  //  |   +--------+   |
+  //  |                |
+  //  +----------------+
+  view1_.SetBounds(gfx::Point(50, 50), 200, 200);
+  view2_.SetBounds(gfx::Point(20, 20), 400, 600);
+  root_.AddChild(&view2_);
+  root_.AddChild(&view1_);
+
+  GenerateTouchEventAt(100.f, 100.f);
+  EXPECT_TRUE(client1_.EventHandled());
+
+  Reset();
+
+  // The front view moved, so the same event now should hit the view below it.
+  //  +----------------+
+  //  |  view2_        |
+  //  |                |
+  //  |   x            | -> (100, 100)
+  //  |     +--------+ |
+  //  |     |        | |
+  //  |     |        | |
+  //  |     +--------+ |
+  //  +----------------+
+  view1_.SetBounds(gfx::Point(150, 150), 200, 200);
+  GenerateTouchEventAt(100.f, 100.f);
+  EXPECT_TRUE(client2_.EventHandled());
+}
+
+TEST_F(ViewAndroidBoundsTest, MatchesViewSizeOfkMatchParent) {
+  //  +----------------+
+  //  |  view1_/view3_ |
+  //  |                |
+  //  |   +--------+   |
+  //  |   |        |   |
+  //  |   | view2_ |   |
+  //  |   |      x |   | -> (100, 100)
+  //  |   +--------+   |
+  //  |             x  | -> (300, 400)
+  //  +----------------+
+
+  view1_.SetBounds(gfx::Point(20, 20), 400, 600);
+  view3_.SetBounds(gfx::Point(),
+                   ViewAndroid::Bounds::kMatchParent,
+                   ViewAndroid::Bounds::kMatchParent);
+  view2_.SetBounds(gfx::Point(50, 50), 200, 200);
+
+  // root
+  //   +-------+
+  //   |       |
+  // view2_  view1_
+  //           |
+  //         view3_
+
+  root_.AddChild(&view1_);
+  root_.AddChild(&view2_);
+  view1_.AddChild(&view3_);
+
+  GenerateTouchEventAt(100.f, 100.f);
+  EXPECT_TRUE(client2_.EventHandled());
+  Reset();
+
+  GenerateTouchEventAt(300.f, 400.f);
+  EXPECT_TRUE(client3_.EventHandled());
+  Reset();
+
+  client3_.SetHandleEvent(false);
+  GenerateTouchEventAt(300.f, 400.f);
+  EXPECT_TRUE(client1_.EventHandled());
+  Reset();
+}
+
+TEST_F(ViewAndroidBoundsTest, MatchesViewsWithOffset) {
+  // (10,20)
+  //  +--------------------------+
+  //  |  view1_     x            | -> (70, 30)
+  //  |   +--------+  +--------+ |
+  //  |   | view2_ |  | view3_ | |
+  //  |   |  x     |  |        | | -> (40, 60)
+  //  |   |        |  |      x | | -> (100, 70)
+  //  |   +--------+  +--------+ |
+  //  |                          |
+  //  +--------------------------+
+  view1_.SetBounds(gfx::Point(10, 20), 150, 100);
+  view2_.SetBounds(gfx::Point(20, 30), 40, 30);
+  view3_.SetBounds(gfx::Point(70, 30), 40, 30);
+
+  // root
+  //   |
+  // view1_
+  //   +-------+
+  //   |       |
+  // view2_  view3_
+  root_.AddChild(&view1_);
+  view1_.AddChild(&view2_);
+  view1_.AddChild(&view3_);
+
+  GenerateTouchEventAt(70, 30);
+  EXPECT_TRUE(client1_.EventHandled());
+  Reset();
+
+  GenerateTouchEventAt(40, 60);
+  EXPECT_TRUE(client2_.EventHandled());
+  Reset();
+
+  GenerateTouchEventAt(100, 70);
+  EXPECT_TRUE(client3_.EventHandled());
+}
+
+}  // namespace ui