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);
+  }
+
+  void ExpectHit(const TestViewClient& hitClient) {
+    TestViewClient* clients[3] = { &client1_, &client2_, &client3_ };
+    for (auto& client : clients) {
+      if (&hitClient == client)
+        EXPECT_TRUE(client->EventHandled());
+      else
+        EXPECT_FALSE(client->EventHandled());
+    }
+    Reset();
+  }
+
+  TestViewRoot root_;
+  TestViewClient client1_;
+  TestViewClient client2_;
+  TestViewClient client3_;
+  ViewAndroid view1_;
+  ViewAndroid view2_;
+  ViewAndroid view3_;
+};
+
+TEST_F(ViewAndroidBoundsTest, MatchesViewInFront) {
+  view1_.SetLayout(50, 50, 400, 600, false);
+  view2_.SetLayout(50, 50, 400, 600, false);
+  root_.AddChild(&view2_);
+  root_.AddChild(&view1_);
+
+  GenerateTouchEventAt(100.f, 100.f);
+  ExpectHit(client1_);
+
+  // View 2 moves up to the top, and events should hit it from now.
+  root_.MoveToTop(&view2_);
+  GenerateTouchEventAt(100.f, 100.f);
+  ExpectHit(client2_);
+}
+
+TEST_F(ViewAndroidBoundsTest, MatchesViewArea) {
+  view1_.SetLayout(50, 50, 200, 200, false);
+  view2_.SetLayout(20, 20, 400, 600, false);
+
+  root_.AddChild(&view2_);
+  root_.AddChild(&view1_);
+
+  // Falls within |view1_|'s bounds
+  GenerateTouchEventAt(100.f, 100.f);
+  ExpectHit(client1_);
+
+  // Falls within |view2_|'s bounds
+  GenerateTouchEventAt(300.f, 400.f);
+  ExpectHit(client2_);
+}
+
+TEST_F(ViewAndroidBoundsTest, MatchesViewAfterMove) {
+  view1_.SetLayout(50, 50, 200, 200, false);
+  view2_.SetLayout(20, 20, 400, 600, false);
+  root_.AddChild(&view2_);
+  root_.AddChild(&view1_);
+
+  GenerateTouchEventAt(100.f, 100.f);
+  ExpectHit(client1_);
+
+  view1_.SetLayout(150, 150, 200, 200, false);
+  GenerateTouchEventAt(100.f, 100.f);
+  ExpectHit(client2_);
+}
+
+TEST_F(ViewAndroidBoundsTest, MatchesViewSizeOfkMatchParent) {
+  view1_.SetLayout(20, 20, 400, 600, false);
+  view3_.SetLayout(0, 0, 0, 0, true);  // match parent
+  view2_.SetLayout(50, 50, 200, 200, false);
+
+  root_.AddChild(&view1_);
+  root_.AddChild(&view2_);
+  view1_.AddChild(&view3_);
+
+  GenerateTouchEventAt(100.f, 100.f);
+  ExpectHit(client2_);
+
+  GenerateTouchEventAt(300.f, 400.f);
+  ExpectHit(client3_);
+
+  client3_.SetHandleEvent(false);
+  GenerateTouchEventAt(300.f, 400.f);
+  ExpectHit(client1_);
+}
+
+TEST_F(ViewAndroidBoundsTest, MatchesViewsWithOffset) {
+  view1_.SetLayout(10, 20, 150, 100, false);
+  view2_.SetLayout(20, 30, 40, 30, false);
+  view3_.SetLayout(70, 30, 40, 30, false);
+
+  root_.AddChild(&view1_);
+  view1_.AddChild(&view2_);
+  view1_.AddChild(&view3_);
+
+  GenerateTouchEventAt(70, 30);
+  ExpectHit(client1_);
+
+  GenerateTouchEventAt(40, 60);
+  ExpectHit(client2_);
+
+  GenerateTouchEventAt(100, 70);
+  ExpectHit(client3_);
+}
+
+}  // namespace ui