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 "chrome/browser/ui/panels/panel_bounds_animation.h"
6
7 #include "chrome/browser/ui/panels/panel.h"
8 #include "chrome/browser/ui/panels/panel_manager.h"
9
10 namespace {
11
12 // These values are experimental and subjective.
13 const int kDefaultFramerateHz = 50;
14 const int kSetBoundsAnimationMs = 180;
15 const int kSetBoundsAnimationBigMinimizeMs = 1500;
16
17 }
18
PanelBoundsAnimation(gfx::AnimationDelegate * target,Panel * panel,const gfx::Rect & initial_bounds,const gfx::Rect & final_bounds)19 PanelBoundsAnimation::PanelBoundsAnimation(gfx::AnimationDelegate* target,
20 Panel* panel,
21 const gfx::Rect& initial_bounds,
22 const gfx::Rect& final_bounds)
23 : gfx::LinearAnimation(kDefaultFramerateHz, target),
24 panel_(panel),
25 for_big_minimize_(false),
26 animation_stop_to_show_titlebar_(0) {
27 // Detect animation that happens when expansion state is set to MINIMIZED
28 // and there is relatively big portion of the panel to hide from view.
29 // Initialize animation differently in this case, using fast-pause-slow
30 // method, see below for more details.
31 int duration = kSetBoundsAnimationMs;
32 if (initial_bounds.height() > final_bounds.height() &&
33 panel_->expansion_state() == Panel::MINIMIZED) {
34 double hidden_title_height =
35 panel_->TitleOnlyHeight() - final_bounds.height();
36 double distance_y = initial_bounds.height() - final_bounds.height();
37 animation_stop_to_show_titlebar_ = 1.0 - hidden_title_height / distance_y;
38 if (animation_stop_to_show_titlebar_ > 0.7) { // Relatively big movement.
39 for_big_minimize_ = true;
40 duration = kSetBoundsAnimationBigMinimizeMs;
41 }
42 }
43 SetDuration(PanelManager::AdjustTimeInterval(duration));
44 }
45
~PanelBoundsAnimation()46 PanelBoundsAnimation::~PanelBoundsAnimation() {
47 }
48
GetCurrentValue() const49 double PanelBoundsAnimation::GetCurrentValue() const {
50 return ComputeAnimationValue(gfx::LinearAnimation::GetCurrentValue(),
51 for_big_minimize_,
52 animation_stop_to_show_titlebar_);
53 }
54
ComputeAnimationValue(double progress,bool for_big_minimize,double animation_stop_to_show_titlebar)55 double PanelBoundsAnimation::ComputeAnimationValue(double progress,
56 bool for_big_minimize, double animation_stop_to_show_titlebar) {
57 if (!for_big_minimize) {
58 // Cubic easing out.
59 double value = 1.0 - progress;
60 return 1.0 - value * value * value;
61 }
62
63 // Minimize animation is done in 3 steps:
64 // 1. Quickly (0 -> 0.15) make only titlebar visible.
65 // 2. Freeze for a little bit (0.15->0.6), just showing titlebar.
66 // 3. Slowly minimize to thin strip (0.6->1.0)
67 const double kProgressAtFreezeStart = 0.15;
68 const double kProgressAtFreezeEnd = 0.6;
69 double value;
70 if (progress <= kProgressAtFreezeStart) {
71 value = animation_stop_to_show_titlebar *
72 (progress / kProgressAtFreezeStart);
73 } else if (progress <= kProgressAtFreezeEnd) {
74 value = animation_stop_to_show_titlebar;
75 } else {
76 value = animation_stop_to_show_titlebar +
77 (1.0 - animation_stop_to_show_titlebar) *
78 ((progress - kProgressAtFreezeEnd) / (1.0 - kProgressAtFreezeEnd));
79 }
80 return value;
81 }
82