Refactor GestureNavigation to eliminate code redundancy

content/browser/web_contents/aura/overscroll_window_delegate_unittest.cc

+// Copyright (c) 2013 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 "content/browser/web_contents/aura/overscroll_window_delegate.h"
+
+#include "content/browser/renderer_host/overscroll_controller_delegate.h"
+#include "content/public/browser/overscroll_configuration.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/aura/test/aura_test_base.h"
+#include "ui/aura/window.h"
+#include "ui/events/test/event_generator.h"
+
+namespace content {
+
+namespace {
+  const int kTestWindowWidth = 600;
+}
+
+class OverscrollWindowDelegateTest : public aura::test::AuraTestBase,
+                                     public OverscrollControllerDelegate {
+ public:
+  OverscrollWindowDelegateTest()
+      : window_(nullptr),
+        overscroll_complete_(false),
+        overscroll_started_(false),
+        current_mode_(OVERSCROLL_NONE),
+        touch_start_threshold_(content::GetOverscrollConfig(
+            content::OVERSCROLL_CONFIG_HORIZ_THRESHOLD_START_TOUCHSCREEN)),
+        touch_complete_threshold_(content::GetOverscrollConfig(
+            content::OVERSCROLL_CONFIG_HORIZ_THRESHOLD_COMPLETE)) {}
+
+  ~OverscrollWindowDelegateTest() override {}
+
+  void Reset() {
+    overscroll_complete_ = false;
+    overscroll_started_ = false;
+    current_mode_ = OVERSCROLL_NONE;
+    window_.reset(CreateNormalWindow(
+        0, root_window(), new OverscrollWindowDelegate(this, gfx::Image())));
+    window_->SetBounds(gfx::Rect(0, 0, kTestWindowWidth, kTestWindowWidth));
+  }
+
+  // Accessors.
+  aura::Window* window() { return window_.get(); }
+
+  bool overscroll_complete() { return overscroll_complete_; }
+  bool overscroll_started() { return overscroll_started_; }
+
+  OverscrollMode current_mode() { return current_mode_; }
+
+  const float touch_start_threshold() {
+    return touch_start_threshold_;
+  }
+
+  const float touch_complete_threshold() {
+    return kTestWindowWidth * touch_complete_threshold_;
+  }
+
+ protected:
+  // aura::test::AuraTestBase:
+  void SetUp() override {
+    aura::test::AuraTestBase::SetUp();
+    Reset();
+  }
+
+  void TearDown() override {
+    window_.reset();
+    aura::test::AuraTestBase::TearDown();
+  }
+
+ private:
+  // OverscrollControllerDelegate:
+  gfx::Rect GetVisibleBounds() const override {
+    return gfx::Rect(600, 0);
+  }
+
+  bool OnOverscrollUpdate(float delta_x, float delta_y) override {
+    return true;
+  }
+
+  void OnOverscrollComplete(OverscrollMode overscroll_mode) override {
+    overscroll_complete_ = true;
+  }
+
+  void OnOverscrollModeChange(OverscrollMode old_mode,
+                              OverscrollMode new_mode) override {
+    current_mode_ = new_mode;
+    if (current_mode_ != OVERSCROLL_NONE)
+      overscroll_started_ = true;
+  }
+
+  // Window in which the overscroll window delegate is installed.
+  scoped_ptr<aura::Window> window_;
+
+  // State flags.
+  bool overscroll_complete_;
+  bool overscroll_started_;
+
+  OverscrollMode current_mode_;
+
+  // Config defined constants.
+  const float touch_start_threshold_;
+  const float touch_complete_threshold_;
+
+  DISALLOW_COPY_AND_ASSIGN(OverscrollWindowDelegateTest);
+};
+
+// Tests that the basic overscroll gesture works and sends updates to the
+// delegate.
+TEST_F(OverscrollWindowDelegateTest, BasicOverscroll) {
+  ui::test::EventGenerator generator(root_window());
+
+  // Start an OVERSCROLL_EAST gesture.
+  generator.GestureScrollSequence(
+      gfx::Point(10, 10),
+      gfx::Point(20 + touch_complete_threshold(), 10),
+      base::TimeDelta::FromMilliseconds(10),
+      10);
+  EXPECT_TRUE(overscroll_started());
+  EXPECT_EQ(current_mode(), OVERSCROLL_EAST);
+  EXPECT_TRUE(overscroll_complete());
+
+  Reset();
+  // Start an OVERSCROLL_WEST gesture.
+  generator.GestureScrollSequence(
+      gfx::Point(20 + touch_complete_threshold(), 10),
+      gfx::Point(10, 10),
+      base::TimeDelta::FromMilliseconds(10),
+      10);
+  EXPECT_TRUE(overscroll_started());
+  EXPECT_EQ(current_mode(), OVERSCROLL_WEST);
+  EXPECT_TRUE(overscroll_complete());
+}
+
+// Verifies that the OverscrollWindowDelegate direction is set correctly during
+// an overscroll.
+TEST_F(OverscrollWindowDelegateTest, BasicOverscrollModes) {
+  ui::test::EventGenerator generator(root_window());
+  OverscrollWindowDelegate* delegate =
+      static_cast<OverscrollWindowDelegate*>(window()->delegate());
+
+  // Start pressing a touch, but do not start the gesture yet.
+  generator.MoveTouch(gfx::Point(10, 10));
+  generator.PressTouch();
+  EXPECT_EQ(delegate->overscroll_mode_, OVERSCROLL_NONE);
+
+  // Slide the touch to the right.
+  generator.MoveTouch(gfx::Point(20 + touch_complete_threshold(), 10));
+  EXPECT_EQ(delegate->overscroll_mode_, OVERSCROLL_EAST);
+
+  // Complete the gesture.
+  generator.ReleaseTouch();
+  EXPECT_EQ(delegate->overscroll_mode_, OVERSCROLL_NONE);
+  EXPECT_TRUE(overscroll_complete());
+
+  // Start another overscroll.
+  generator.MoveTouch(gfx::Point(20 + touch_complete_threshold(), 10));
+  generator.PressTouch();
+  EXPECT_EQ(delegate->overscroll_mode_, OVERSCROLL_NONE);
+
+  // Slide the touch to the left.
+  generator.MoveTouch(gfx::Point(10, 10));
+  EXPECT_EQ(delegate->overscroll_mode_, OVERSCROLL_WEST);
+
+  // Complete the gesture.
+  generator.ReleaseTouch();
+  EXPECT_EQ(delegate->overscroll_mode_, OVERSCROLL_NONE);
+  EXPECT_TRUE(overscroll_complete());
+}
+
+// Tests that the overscroll does not start until the gesture gets past a
+// particular threshold.
+TEST_F(OverscrollWindowDelegateTest, OverscrollThreshold) {
+  ui::test::EventGenerator generator(root_window());
+
+  // Start an OVERSCROLL_EAST gesture.
+  generator.GestureScrollSequence(
+      gfx::Point(10, 10),
+      gfx::Point(10 + touch_start_threshold(), 10),
+      base::TimeDelta::FromMilliseconds(10),
+      10);
+  EXPECT_FALSE(overscroll_started());
+  EXPECT_EQ(current_mode(), OVERSCROLL_NONE);
+  EXPECT_FALSE(overscroll_complete());
+
+  Reset();
+  // Start an OVERSCROLL_WEST gesture.
+  generator.GestureScrollSequence(
+      gfx::Point(10 + touch_start_threshold(), 10),
+      gfx::Point(10, 10),
+      base::TimeDelta::FromMilliseconds(10),
+      10);
+  EXPECT_FALSE(overscroll_started());
+  EXPECT_EQ(current_mode(), OVERSCROLL_NONE);
+  EXPECT_FALSE(overscroll_complete());
+}
+
+// Tests that the overscroll is aborted if the gesture does not get past the
+// completion threshold.
+TEST_F(OverscrollWindowDelegateTest, AbortOverscrollThreshold) {
+  ui::test::EventGenerator generator(root_window());
+
+  // Start an OVERSCROLL_EAST gesture.
+  generator.GestureScrollSequence(
+      gfx::Point(10, 10),
+      gfx::Point(20 + touch_start_threshold(), 10),
+      base::TimeDelta::FromMilliseconds(10),
+      10);
+  EXPECT_TRUE(overscroll_started());
+  EXPECT_EQ(current_mode(), OVERSCROLL_NONE);
+  EXPECT_FALSE(overscroll_complete());
+
+  Reset();
+  // Start an OVERSCROLL_WEST gesture.
+  generator.GestureScrollSequence(
+      gfx::Point(20 + touch_start_threshold(), 10),
+      gfx::Point(10, 10),
+      base::TimeDelta::FromMilliseconds(10),
+      10);
+  EXPECT_TRUE(overscroll_started());
+  EXPECT_EQ(current_mode(), OVERSCROLL_NONE);
+  EXPECT_FALSE(overscroll_complete());
+}
+
+// Tests that the overscroll is aborted if the delegate receives some other
+// event.
+TEST_F(OverscrollWindowDelegateTest, EventAbortsOverscroll) {
+  ui::test::EventGenerator generator(root_window());
+  // Start an OVERSCROLL_EAST gesture, without releasing touch.
+  generator.set_current_location(gfx::Point(10, 10));
+  generator.PressTouch();
+  int touch_x = touch_start_threshold() + 20;
+  generator.MoveTouch(gfx::Point(touch_x, 10));
+  EXPECT_TRUE(overscroll_started());
+  EXPECT_EQ(current_mode(), OVERSCROLL_EAST);
+  EXPECT_FALSE(overscroll_complete());
+
+  // Dispatch a mouse event, the overscroll should be cancelled.
+  generator.PressLeftButton();
+  EXPECT_EQ(current_mode(), OVERSCROLL_NONE);
+  EXPECT_FALSE(overscroll_complete());
+
+  // We should be able to restart the overscroll without lifting the finger.
+  generator.MoveTouch(gfx::Point(touch_x + touch_start_threshold() + 10, 10));
+  EXPECT_EQ(current_mode(), OVERSCROLL_EAST);
+  EXPECT_FALSE(overscroll_complete());
+}
+
+}  // namespace content