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      1   // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Tests for the TouchFlingGestureCurve.
      6 
      7 #include "content/child/touch_fling_gesture_curve.h"
      8 
      9 #include "base/memory/scoped_ptr.h"
     10 #include "testing/gtest/include/gtest/gtest.h"
     11 #include "third_party/WebKit/public/platform/WebFloatPoint.h"
     12 #include "third_party/WebKit/public/platform/WebFloatSize.h"
     13 #include "third_party/WebKit/public/platform/WebGestureCurve.h"
     14 #include "third_party/WebKit/public/platform/WebGestureCurveTarget.h"
     15 #include "third_party/WebKit/public/platform/WebSize.h"
     16 
     17 using blink::WebFloatPoint;
     18 using blink::WebFloatSize;
     19 using blink::WebGestureCurve;
     20 using blink::WebGestureCurveTarget;
     21 using blink::WebSize;
     22 
     23 namespace {
     24 
     25 class MockGestureCurveTarget : public WebGestureCurveTarget {
     26  public:
     27   virtual bool scrollBy(const WebFloatSize& delta,
     28                         const WebFloatSize& velocity) OVERRIDE {
     29     cumulative_delta_.width += delta.width;
     30     cumulative_delta_.height += delta.height;
     31     current_velocity_ = velocity;
     32     return true;
     33   }
     34 
     35   WebFloatSize cumulative_delta() const { return cumulative_delta_; }
     36   void resetCumulativeDelta() { cumulative_delta_ = WebFloatSize(); }
     37 
     38   WebFloatSize current_velocity() const { return current_velocity_; }
     39 
     40  private:
     41   WebFloatSize cumulative_delta_;
     42   WebFloatSize current_velocity_;
     43 };
     44 
     45 } // namespace anonymous
     46 
     47 TEST(TouchFlingGestureCurve, flingCurveTouch)
     48 {
     49   double initialVelocity = 5000;
     50   MockGestureCurveTarget target;
     51 
     52   scoped_ptr<WebGestureCurve> curve(content::TouchFlingGestureCurve::Create(
     53       WebFloatPoint(initialVelocity, 0), WebSize()));
     54 
     55   // Note: the expectations below are dependent on the curve parameters hard
     56   // coded into the create call above.
     57   EXPECT_TRUE(curve->apply(0, &target));
     58   EXPECT_TRUE(curve->apply(0.25, &target));
     59   EXPECT_NEAR(target.current_velocity().width, 1878, 1);
     60   EXPECT_EQ(target.current_velocity().height, 0);
     61   EXPECT_TRUE(curve->apply(0.45f, &target)); // Use non-uniform tick spacing.
     62   EXPECT_TRUE(curve->apply(1, &target));
     63   EXPECT_FALSE(curve->apply(1.5, &target));
     64   EXPECT_NEAR(target.cumulative_delta().width, 1193, 1);
     65   EXPECT_EQ(target.cumulative_delta().height, 0);
     66   EXPECT_EQ(target.current_velocity().width, 0);
     67   EXPECT_EQ(target.current_velocity().height, 0);
     68 }
     69 
     70