ui/compositor/float_animation_curve_adapter.cc

   1 // Copyright (c) 2012 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 #include "ui/compositor/float_animation_curve_adapter.h"
   6
   7 #include "cc/base/time_util.h"
   8
   9 namespace ui {
  10
  11 FloatAnimationCurveAdapter::FloatAnimationCurveAdapter(
  12     gfx::Tween::Type tween_type,
  13     float initial_value,
  14     float target_value,
  15     base::TimeDelta duration)
  16     : tween_type_(tween_type),
  17       initial_value_(initial_value),
  18       target_value_(target_value),
  19       duration_(duration) {
  20 }
  21
  22 base::TimeDelta FloatAnimationCurveAdapter::Duration() const {
  23   return duration_;
  24 }
  25
  26 scoped_ptr<cc::AnimationCurve> FloatAnimationCurveAdapter::Clone() const {
  27   return make_scoped_ptr(new FloatAnimationCurveAdapter(
  28       tween_type_, initial_value_, target_value_, duration_));
  29 }
  30
  31 float FloatAnimationCurveAdapter::GetValue(base::TimeDelta t) const {
  32   if (t >= duration_)
  33     return target_value_;
  34   if (t <= base::TimeDelta())
  35     return initial_value_;
  36   double progress = cc::TimeUtil::Divide(t, duration_);
  37   return gfx::Tween::FloatValueBetween(
  38       gfx::Tween::CalculateValue(tween_type_, progress),
  39       initial_value_,
  40       target_value_);
  41 }
  42
  43 }  // namespace ui