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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "ui/views/animation/scroll_animator.h" | 5 #include "ui/views/animation/scroll_animator.h" |
6 | 6 |
7 #include <algorithm> | 7 #include <algorithm> |
8 #include <cmath> | 8 #include <cmath> |
9 | 9 |
10 #include "base/logging.h" | 10 #include "base/logging.h" |
11 #include "ui/base/animation/slide_animation.h" | 11 #include "ui/gfx/animation/slide_animation.h" |
12 | 12 |
13 namespace { | 13 namespace { |
14 const float kDefaultAcceleration = -1500.0f; // in pixels per second^2 | 14 const float kDefaultAcceleration = -1500.0f; // in pixels per second^2 |
15 | 15 |
16 // Assumes that d0 == 0.0f | 16 // Assumes that d0 == 0.0f |
17 float GetPosition(float v0, float a, float t) { | 17 float GetPosition(float v0, float a, float t) { |
18 float max_t = -v0 / a; | 18 float max_t = -v0 / a; |
19 if (t > max_t) | 19 if (t > max_t) |
20 t = max_t; | 20 t = max_t; |
21 return t * (v0 + 0.5f * a * t); | 21 return t * (v0 + 0.5f * a * t); |
(...skipping 22 matching lines...) Expand all Loading... |
44 } | 44 } |
45 | 45 |
46 void ScrollAnimator::Start(float velocity_x, float velocity_y) { | 46 void ScrollAnimator::Start(float velocity_x, float velocity_y) { |
47 if (acceleration_ >= 0.0f) | 47 if (acceleration_ >= 0.0f) |
48 acceleration_ = kDefaultAcceleration; | 48 acceleration_ = kDefaultAcceleration; |
49 float v = std::max(fabs(velocity_x), fabs(velocity_y)); | 49 float v = std::max(fabs(velocity_x), fabs(velocity_y)); |
50 last_t_ = 0.0f; | 50 last_t_ = 0.0f; |
51 velocity_x_ = velocity_x; | 51 velocity_x_ = velocity_x; |
52 velocity_y_ = velocity_y; | 52 velocity_y_ = velocity_y; |
53 duration_ = -v / acceleration_; // in seconds | 53 duration_ = -v / acceleration_; // in seconds |
54 animation_.reset(new ui::SlideAnimation(this)); | 54 animation_.reset(new gfx::SlideAnimation(this)); |
55 animation_->SetSlideDuration(static_cast<int>(duration_ * 1000)); | 55 animation_->SetSlideDuration(static_cast<int>(duration_ * 1000)); |
56 animation_->Show(); | 56 animation_->Show(); |
57 } | 57 } |
58 | 58 |
59 void ScrollAnimator::Stop() { | 59 void ScrollAnimator::Stop() { |
60 velocity_x_ = velocity_y_ = last_t_ = duration_ = 0.0f; | 60 velocity_x_ = velocity_y_ = last_t_ = duration_ = 0.0f; |
61 animation_.reset(); | 61 animation_.reset(); |
62 } | 62 } |
63 | 63 |
64 void ScrollAnimator::AnimationEnded(const ui::Animation* animation) { | 64 void ScrollAnimator::AnimationEnded(const gfx::Animation* animation) { |
65 Stop(); | 65 Stop(); |
66 } | 66 } |
67 | 67 |
68 void ScrollAnimator::AnimationProgressed(const ui::Animation* animation) { | 68 void ScrollAnimator::AnimationProgressed(const gfx::Animation* animation) { |
69 float t = static_cast<float>(animation->GetCurrentValue()) * duration_; | 69 float t = static_cast<float>(animation->GetCurrentValue()) * duration_; |
70 float a_x = velocity_x_ > 0 ? acceleration_ : -acceleration_; | 70 float a_x = velocity_x_ > 0 ? acceleration_ : -acceleration_; |
71 float a_y = velocity_y_ > 0 ? acceleration_ : -acceleration_; | 71 float a_y = velocity_y_ > 0 ? acceleration_ : -acceleration_; |
72 float dx = GetDelta(velocity_x_, a_x, last_t_, t); | 72 float dx = GetDelta(velocity_x_, a_x, last_t_, t); |
73 float dy = GetDelta(velocity_y_, a_y, last_t_, t); | 73 float dy = GetDelta(velocity_y_, a_y, last_t_, t); |
74 last_t_ = t; | 74 last_t_ = t; |
75 delegate_->OnScroll(dx, dy); | 75 delegate_->OnScroll(dx, dy); |
76 } | 76 } |
77 | 77 |
78 void ScrollAnimator::AnimationCanceled(const ui::Animation* animation) { | 78 void ScrollAnimator::AnimationCanceled(const gfx::Animation* animation) { |
79 Stop(); | 79 Stop(); |
80 } | 80 } |
81 | 81 |
82 } // namespace views | 82 } // namespace views |
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