Add EventForwarder for routing touch events

ui/android/view_android_unittests.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/event_forwarder.h"
+#include "ui/android/view_android.h"
+#include "ui/android/view_client.h"
+#include "ui/events/android/motion_event_android.h"
+
+namespace ui {
+
+using base::android::JavaParamRef;
+
+class TestViewClient : public ViewClient {
+ public:
+  TestViewClient() : handle_event_(true), called_(false) {}
+
+  void SetHandleEvent(bool handle_event) { handle_event_ = handle_event; }
+  bool OnTouchEvent(const MotionEventAndroid& event,
+                    bool for_touch_handle) override {
+    called_ = true;
+    return handle_event_;
+  }
+
+  bool EventHandled() { return called_ && handle_event_; }
+  bool EventCalled() { return called_; }
+  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()
+      : root_(nullptr),
+        view1_(&client1_),
+        view2_(&client2_),
+        view3_(&client3_) {
+    root_.GetEventForwarder();
+    root_.SetLayout(ViewAndroid::LayoutParams::MatchParent());
+  }
+
+  void Reset() {
+    client1_.Reset();
+    client2_.Reset();
+    client3_.Reset();
+  }
+
+  void GenerateTouchEventAt(float x, float y) {
+    ui::MotionEventAndroid::Pointer pointer0(0, x, y, 0, 0, 0, 0, 0);
+    ui::MotionEventAndroid::Pointer pointer1(0, 0, 0, 0, 0, 0, 0, 0);
+    ui::MotionEventAndroid event(1.f, nullptr, JavaParamRef<jobject>(nullptr),
+                                 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, &pointer0,
+                                 &pointer1);
+    root_.OnTouchEvent(event, 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();
+  }
+
+  ViewAndroid root_;
+  ViewAndroid view1_;
+  ViewAndroid view2_;
+  ViewAndroid view3_;
+  TestViewClient client1_;
+  TestViewClient client2_;
+  TestViewClient client3_;
+};
+
+TEST_F(ViewAndroidBoundsTest, MatchesViewInFront) {
+  view1_.SetLayout(ViewAndroid::LayoutParams::Normal(50, 50, 400, 600));
+  view2_.SetLayout(ViewAndroid::LayoutParams::Normal(50, 50, 400, 600));
+  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_.MoveToFront(&view2_);
+  GenerateTouchEventAt(100.f, 100.f);
+  ExpectHit(client2_);
+}
+
+TEST_F(ViewAndroidBoundsTest, MatchesViewArea) {
+  view1_.SetLayout(ViewAndroid::LayoutParams::Normal(50, 50, 200, 200));
+  view2_.SetLayout(ViewAndroid::LayoutParams::Normal(20, 20, 400, 600));
+
+  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(ViewAndroid::LayoutParams::Normal(50, 50, 200, 200));
+  view2_.SetLayout(ViewAndroid::LayoutParams::Normal(20, 20, 400, 600));
+  root_.AddChild(&view2_);
+  root_.AddChild(&view1_);
+
+  GenerateTouchEventAt(100.f, 100.f);
+  ExpectHit(client1_);
+
+  view1_.SetLayout(ViewAndroid::LayoutParams::Normal(150, 150, 200, 200));
+  GenerateTouchEventAt(100.f, 100.f);
+  ExpectHit(client2_);
+}
+
+TEST_F(ViewAndroidBoundsTest, MatchesViewSizeOfkMatchParent) {
+  view1_.SetLayout(ViewAndroid::LayoutParams::Normal(20, 20, 400, 600));
+  view3_.SetLayout(ViewAndroid::LayoutParams::MatchParent());
+  view2_.SetLayout(ViewAndroid::LayoutParams::Normal(50, 50, 200, 200));
+
+  root_.AddChild(&view1_);
+  root_.AddChild(&view2_);
+  view1_.AddChild(&view3_);
+
+  GenerateTouchEventAt(100.f, 100.f);
+  ExpectHit(client2_);
+
+  GenerateTouchEventAt(300.f, 400.f);
+  ExpectHit(client1_);
+
+  client1_.SetHandleEvent(false);
+  GenerateTouchEventAt(300.f, 400.f);
+  EXPECT_TRUE(client1_.EventCalled());
+  ExpectHit(client3_);
+}
+
+TEST_F(ViewAndroidBoundsTest, MatchesViewsWithOffset) {
+  view1_.SetLayout(ViewAndroid::LayoutParams::Normal(10, 20, 150, 100));
+  view2_.SetLayout(ViewAndroid::LayoutParams::Normal(20, 30, 40, 30));
+  view3_.SetLayout(ViewAndroid::LayoutParams::Normal(70, 30, 40, 30));
+
+  root_.AddChild(&view1_);
+  view1_.AddChild(&view2_);
+  view1_.AddChild(&view3_);
+
+  GenerateTouchEventAt(70, 30);
+  ExpectHit(client1_);
+
+  client1_.SetHandleEvent(false);
+  GenerateTouchEventAt(40, 60);
+  EXPECT_TRUE(client1_.EventCalled());
+  ExpectHit(client2_);
+
+  GenerateTouchEventAt(100, 70);
+  EXPECT_TRUE(client1_.EventCalled());
+  ExpectHit(client3_);
+}
+
+}  // namespace ui