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 "ash/rotator/screen_rotation.h"
6
7 #include "base/time/time.h"
8 #include "ui/compositor/layer.h"
9 #include "ui/gfx/interpolated_transform.h"
10 #include "ui/gfx/rect.h"
11 #include "ui/gfx/transform.h"
12
13 namespace ash {
14
15 namespace {
16
17 const int k90DegreeTransitionDurationMs = 350;
18 const int k180DegreeTransitionDurationMs = 550;
19 const int k360DegreeTransitionDurationMs = 750;
20
GetTransitionDuration(int degrees)21 base::TimeDelta GetTransitionDuration(int degrees) {
22 if (degrees == 360)
23 return base::TimeDelta::FromMilliseconds(k360DegreeTransitionDurationMs);
24 if (degrees == 180)
25 return base::TimeDelta::FromMilliseconds(k180DegreeTransitionDurationMs);
26 if (degrees == 0)
27 return base::TimeDelta::FromMilliseconds(0);
28 return base::TimeDelta::FromMilliseconds(k90DegreeTransitionDurationMs);
29 }
30
31 } // namespace
32
ScreenRotation(int degrees,ui::Layer * layer)33 ScreenRotation::ScreenRotation(int degrees, ui::Layer* layer)
34 : ui::LayerAnimationElement(LayerAnimationElement::TRANSFORM,
35 GetTransitionDuration(degrees)),
36 degrees_(degrees) {
37 InitTransform(layer);
38 }
39
~ScreenRotation()40 ScreenRotation::~ScreenRotation() {
41 }
42
InitTransform(ui::Layer * layer)43 void ScreenRotation::InitTransform(ui::Layer* layer) {
44 // No rotation required, use the identity transform.
45 if (degrees_ == 0) {
46 interpolated_transform_.reset(
47 new ui::InterpolatedConstantTransform(gfx::Transform()));
48 return;
49 }
50
51 // Use the target transform/bounds in case the layer is already animating.
52 const gfx::Transform& current_transform = layer->GetTargetTransform();
53 const gfx::Rect& bounds = layer->GetTargetBounds();
54
55 gfx::Point old_pivot;
56 gfx::Point new_pivot;
57
58 int width = bounds.width();
59 int height = bounds.height();
60
61 switch (degrees_) {
62 case 90:
63 new_origin_ = new_pivot = gfx::Point(width, 0);
64 break;
65 case -90:
66 new_origin_ = new_pivot = gfx::Point(0, height);
67 break;
68 case 180:
69 case 360:
70 new_pivot = old_pivot = gfx::Point(width / 2, height / 2);
71 new_origin_.SetPoint(width, height);
72 break;
73 }
74
75 // Convert points to world space.
76 current_transform.TransformPoint(&old_pivot);
77 current_transform.TransformPoint(&new_pivot);
78 current_transform.TransformPoint(&new_origin_);
79
80 scoped_ptr<ui::InterpolatedTransform> rotation(
81 new ui::InterpolatedTransformAboutPivot(
82 old_pivot,
83 new ui::InterpolatedRotation(0, degrees_)));
84
85 scoped_ptr<ui::InterpolatedTransform> translation(
86 new ui::InterpolatedTranslation(
87 gfx::Point(0, 0),
88 gfx::Point(new_pivot.x() - old_pivot.x(),
89 new_pivot.y() - old_pivot.y())));
90
91 float scale_factor = 0.9f;
92 scoped_ptr<ui::InterpolatedTransform> scale_down(
93 new ui::InterpolatedScale(1.0f, scale_factor, 0.0f, 0.5f));
94
95 scoped_ptr<ui::InterpolatedTransform> scale_up(
96 new ui::InterpolatedScale(1.0f, 1.0f / scale_factor, 0.5f, 1.0f));
97
98 interpolated_transform_.reset(
99 new ui::InterpolatedConstantTransform(current_transform));
100
101 scale_up->SetChild(scale_down.release());
102 translation->SetChild(scale_up.release());
103 rotation->SetChild(translation.release());
104 interpolated_transform_->SetChild(rotation.release());
105 }
106
OnStart(ui::LayerAnimationDelegate * delegate)107 void ScreenRotation::OnStart(ui::LayerAnimationDelegate* delegate) {
108 }
109
OnProgress(double t,ui::LayerAnimationDelegate * delegate)110 bool ScreenRotation::OnProgress(double t,
111 ui::LayerAnimationDelegate* delegate) {
112 delegate->SetTransformFromAnimation(interpolated_transform_->Interpolate(t));
113 return true;
114 }
115
OnGetTarget(TargetValue * target) const116 void ScreenRotation::OnGetTarget(TargetValue* target) const {
117 target->transform = interpolated_transform_->Interpolate(1.0);
118 }
119
OnAbort(ui::LayerAnimationDelegate * delegate)120 void ScreenRotation::OnAbort(ui::LayerAnimationDelegate* delegate) {
121 }
122
123 } // namespace ash
124