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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/rotator/window_rotation.h"
#include <memory>
#include "base/time/time.h"
#include "ui/compositor/layer.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/transform.h"
#include "ui/gfx/interpolated_transform.h"
namespace ash {
namespace {
const int k90DegreeTransitionDurationMs = 350;
const int k180DegreeTransitionDurationMs = 550;
const int k360DegreeTransitionDurationMs = 750;
base::TimeDelta GetTransitionDuration(int degrees) {
if (degrees == 360)
return base::Milliseconds(k360DegreeTransitionDurationMs);
if (degrees == 180)
return base::Milliseconds(k180DegreeTransitionDurationMs);
if (degrees == 0)
return base::Milliseconds(0);
return base::Milliseconds(k90DegreeTransitionDurationMs);
}
} // namespace
WindowRotation::WindowRotation(int degrees, ui::Layer* layer)
: ui::LayerAnimationElement(LayerAnimationElement::TRANSFORM,
GetTransitionDuration(degrees)),
degrees_(degrees) {
InitTransform(layer);
}
WindowRotation::~WindowRotation() = default;
void WindowRotation::InitTransform(ui::Layer* layer) {
// No rotation required, use the identity transform.
if (degrees_ == 0) {
interpolated_transform_ =
std::make_unique<ui::InterpolatedConstantTransform>(gfx::Transform());
return;
}
// Use the target transform/bounds in case the layer is already animating.
const gfx::Transform& current_transform = layer->GetTargetTransform();
const gfx::Rect& bounds = layer->GetTargetBounds();
gfx::Point old_pivot;
gfx::Point new_pivot;
int width = bounds.width();
int height = bounds.height();
switch (degrees_) {
case 90:
new_origin_ = new_pivot = gfx::Point(width, 0);
break;
case -90:
new_origin_ = new_pivot = gfx::Point(0, height);
break;
case 180:
case 360:
new_pivot = old_pivot = gfx::Point(width / 2, height / 2);
new_origin_.SetPoint(width, height);
break;
}
// Convert points to world space.
old_pivot = current_transform.MapPoint(old_pivot);
new_pivot = current_transform.MapPoint(new_pivot);
new_origin_ = current_transform.MapPoint(new_origin_);
std::unique_ptr<ui::InterpolatedTransform> rotation =
std::make_unique<ui::InterpolatedTransformAboutPivot>(
old_pivot, std::make_unique<ui::InterpolatedRotation>(0, degrees_));
std::unique_ptr<ui::InterpolatedTransform> translation =
std::make_unique<ui::InterpolatedTranslation>(
gfx::PointF(), gfx::PointF(new_pivot.x() - old_pivot.x(),
new_pivot.y() - old_pivot.y()));
float scale_factor = 0.9f;
std::unique_ptr<ui::InterpolatedTransform> scale_down =
std::make_unique<ui::InterpolatedScale>(1.0f, scale_factor, 0.0f, 0.5f);
std::unique_ptr<ui::InterpolatedTransform> scale_up =
std::make_unique<ui::InterpolatedScale>(1.0f, 1.0f / scale_factor, 0.5f,
1.0f);
interpolated_transform_ =
std::make_unique<ui::InterpolatedConstantTransform>(current_transform);
scale_up->SetChild(std::move(scale_down));
translation->SetChild(std::move(scale_up));
rotation->SetChild(std::move(translation));
interpolated_transform_->SetChild(std::move(rotation));
}
void WindowRotation::OnStart(ui::LayerAnimationDelegate* delegate) {}
bool WindowRotation::OnProgress(double t,
ui::LayerAnimationDelegate* delegate) {
delegate->SetTransformFromAnimation(interpolated_transform_->Interpolate(t),
ui::PropertyChangeReason::FROM_ANIMATION);
return true;
}
void WindowRotation::OnGetTarget(TargetValue* target) const {
target->transform = interpolated_transform_->Interpolate(1.0);
}
void WindowRotation::OnAbort(ui::LayerAnimationDelegate* delegate) {}
} // namespace ash
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