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// Copyright 2021 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/ambient/ui/ambient_shield_view.h"
#include <array>
#include "ash/ambient/ui/ambient_view_ids.h"
#include "ash/style/dark_light_mode_controller_impl.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/compositor/layer_delegate.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/color_palette.h"
#include "ui/gfx/skia_paint_util.h"
#include "ui/views/background.h"
#include "ui/views/layout/flex_layout.h"
#include "ui/views/layout/flex_layout_types.h"
#include "ui/views/view.h"
#include "ui/views/view_class_properties.h"
namespace ash {
namespace {
// Gray gradient from 5% to 50%.
constexpr std::array<SkColor, 2> kDarkModeColors{
SkColorSetA(gfx::kGoogleGrey900, 12),
SkColorSetA(gfx::kGoogleGrey900, 128)};
// Gray gradient from 0% to 20%.
constexpr std::array<SkColor, 2> kLightModeColors{
SkColorSetA(gfx::kGoogleGrey900, 0), SkColorSetA(gfx::kGoogleGrey900, 51)};
class GradientBackground : public views::Background {
public:
enum class Orientation {
kHorizontal,
kVertical,
kDiagonalAscending,
kDiagonalDescending
};
GradientBackground(Orientation orientation,
SkColor start_color,
SkColor end_color)
: orientation_(orientation),
start_color_(start_color),
end_color_(end_color) {}
GradientBackground(const GradientBackground&) = delete;
GradientBackground& operator=(const GradientBackground&) = delete;
~GradientBackground() override = default;
// views::Background:
void Paint(gfx::Canvas* canvas, views::View* view) const override {
const auto& bounds = view->GetContentsBounds();
const auto& points = GetPoints(bounds);
cc::PaintFlags flags;
flags.setBlendMode(SkBlendMode::kSrcOver);
flags.setShader(gfx::CreateGradientShader(points.front(), points.back(),
start_color_, end_color_));
canvas->DrawRect(bounds, flags);
}
private:
const std::array<gfx::Point, 2> GetPoints(const gfx::Rect& bounds) const {
switch (orientation_) {
case Orientation::kHorizontal:
return {bounds.left_center(), bounds.right_center()};
case Orientation::kVertical:
return {bounds.top_center(), bounds.bottom_center()};
case Orientation::kDiagonalAscending:
return {bounds.bottom_left(), bounds.top_right()};
case Orientation::kDiagonalDescending:
return {bounds.origin(), bounds.bottom_right()};
}
}
const Orientation orientation_;
const SkColor start_color_;
const SkColor end_color_;
};
std::unique_ptr<GradientBackground> CreateGradientBackground(
GradientBackground::Orientation orientation,
const std::array<SkColor, 2> colors) {
return std::make_unique<GradientBackground>(orientation, colors.front(),
colors.back());
}
} // namespace
AmbientShieldView::AmbientShieldView() {
SetID(AmbientViewID::kAmbientShieldView);
InitLayout();
}
AmbientShieldView::~AmbientShieldView() = default;
void AmbientShieldView::InitLayout() {
const views::FlexSpecification kScaleUnbounded(
views::MinimumFlexSizeRule::kPreferred,
views::MaximumFlexSizeRule::kUnbounded);
views::FlexLayout* layout =
SetLayoutManager(std::make_unique<views::FlexLayout>());
layout->SetOrientation(views::LayoutOrientation::kVertical);
layout->SetMainAxisAlignment(views::LayoutAlignment::kCenter);
layout->SetCrossAxisAlignment(views::LayoutAlignment::kStretch);
views::View* top = AddChildView(std::make_unique<views::View>());
views::View* bottom = AddChildView(std::make_unique<views::View>());
for (auto* view : {top, bottom})
view->SetProperty(views::kFlexBehaviorKey, kScaleUnbounded);
// TODO(b/223270660): Listen for dark/light mode changes.
bool dark_mode = DarkLightModeControllerImpl::Get()->IsDarkModeEnabled();
const auto& colors = dark_mode ? kDarkModeColors : kLightModeColors;
top->SetBackground(views::CreateSolidBackground(colors.front()));
bottom->SetBackground(CreateGradientBackground(
GradientBackground::Orientation::kVertical, colors));
}
BEGIN_METADATA(AmbientShieldView)
END_METADATA
} // namespace ash
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