content/child/fling_curve_configuration.h

   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 #ifndef CONTENT_CHILD_FLING_CURVE_CONFIGURATION_H_
   6 #define CONTENT_CHILD_FLING_CURVE_CONFIGURATION_H_
   7
   8 #include <vector>
   9
  10 #include "base/synchronization/lock.h"
  11 #include "third_party/WebKit/public/platform/WebFloatPoint.h"
  12 #include "third_party/WebKit/public/platform/WebSize.h"
  13
  14 namespace blink {
  15 class WebGestureCurve;
  16 }
  17
  18 namespace content {
  19
  20 // A class to manage dynamically adjustable parameters controlling the
  21 // shape of the fling deacceleration function.
  22 class FlingCurveConfiguration {
  23  public:
  24   FlingCurveConfiguration();
  25   virtual ~FlingCurveConfiguration();
  26
  27   // Create a touchpad fling curve using the current parameters.
  28   blink::WebGestureCurve* CreateForTouchPad(
  29       const blink::WebFloatPoint& velocity,
  30       const blink::WebSize& cumulativeScroll);
  31
  32   // Create a touchscreen fling curve using the current parameters.
  33   blink::WebGestureCurve* CreateForTouchScreen(
  34       const blink::WebFloatPoint& velocity,
  35       const blink::WebSize& cumulativeScroll);
  36
  37   // Set the curve parameters.
  38   void SetCurveParameters(
  39       const std::vector<float>& new_touchpad,
  40       const std::vector<float>& new_touchscreen);
  41
  42  private:
  43   blink::WebGestureCurve* CreateCore(
  44     const std::vector<float>& coefs,
  45     const blink::WebFloatPoint& velocity,
  46     const blink::WebSize& cumulativeScroll);
  47
  48   // Protect access to touchpad_coefs_ and touchscreen_coefs_.
  49   base::Lock lock_;
  50   std::vector<float> touchpad_coefs_;
  51   std::vector<float> touchscreen_coefs_;
  52
  53   DISALLOW_COPY_AND_ASSIGN(FlingCurveConfiguration);
  54 };
  55
  56 } // namespace content
  57
  58 #endif // CONTENT_CHILD_FLING_CURVE_CONFIGURATION_H_