1 // Copyright 2013 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 "chrome/browser/ui/autofill/loading_animation.h" 6 7 #include "base/logging.h" 8 #include "ui/gfx/animation/tween.h" 9 10 namespace autofill { 11 12 // Duration of one cycle of the animation. 13 static const int kDurationMs = 1800; 14 15 // The frame rate of the animation. 16 static const int kHertz = 60; 17 18 LoadingAnimation::LoadingAnimation(gfx::AnimationDelegate* delegate, 19 int font_height) 20 : LinearAnimation(kDurationMs, kHertz, delegate), 21 first_cycle_(true), 22 font_height_(font_height) {} 23 24 LoadingAnimation::~LoadingAnimation() {} 25 26 void LoadingAnimation::Step(base::TimeTicks time_now) { 27 LinearAnimation::Step(time_now); 28 29 if (!is_animating()) { 30 first_cycle_ = false; 31 Start(); 32 } 33 } 34 35 double LoadingAnimation::GetCurrentValueForDot(size_t dot_i) const { 36 double base_value = gfx::LinearAnimation::GetCurrentValue(); 37 38 const double kSecondDotDelayMs = 100.0; 39 const double kThirdDotDelayMs = 300.0; 40 if (dot_i == 1) 41 base_value -= kSecondDotDelayMs / kDurationMs; 42 else if (dot_i == 2) 43 base_value -= kThirdDotDelayMs / kDurationMs; 44 45 if (base_value < 0.0) 46 base_value = first_cycle_ ? 0.0 : base_value + 1.0; 47 48 double value = gfx::Tween::CalculateValue(gfx::Tween::EASE_OUT, base_value); 49 50 static AnimationFrame kAnimationFrames[] = { 51 { 0.0, 0.0 }, 52 { 0.55, 0.0 }, 53 { 0.6, -1.0 }, 54 { 0.8, 0.3 }, 55 { 0.9, -0.2 }, 56 { 0.95, 0.1 }, 57 { 1.0, 0.0 }, 58 }; 59 60 for (size_t i = 0; i < arraysize(kAnimationFrames); ++i) { 61 if (value > kAnimationFrames[i].value) 62 continue; 63 64 double position; 65 if (i == 0) { 66 position = kAnimationFrames[i].position; 67 } else { 68 double inter_frame_value = 69 (value - kAnimationFrames[i - 1].value) / 70 (kAnimationFrames[i].value - kAnimationFrames[i - 1].value); 71 position = gfx::Tween::FloatValueBetween(inter_frame_value, 72 kAnimationFrames[i - 1].position, 73 kAnimationFrames[i].position); 74 } 75 return position * font_height_ / 2.0; 76 } 77 78 NOTREACHED(); 79 return 0.0; 80 } 81 82 void LoadingAnimation::Reset() { 83 Stop(); 84 first_cycle_ = true; 85 } 86 87 } // namespace autofill 88
