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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 "ui/views/background.h"
#include <optional>
#include <utility>
#include "base/check.h"
#include "base/notreached.h"
#include "build/build_config.h"
#include "cc/paint/paint_flags.h"
#include "ui/color/color_id.h"
#include "ui/color/color_provider.h"
#include "ui/color/color_variant.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/color_palette.h"
#include "ui/gfx/geometry/rounded_corners_f.h"
#include "ui/gfx/geometry/skia_conversions.h"
#include "ui/views/painter.h"
#include "ui/views/view.h"
#if BUILDFLAG(IS_WIN)
#include "skia/ext/skia_utils_win.h"
#endif
namespace views {
// SolidBackground is a trivial Background implementation that fills the
// background in a solid color.
class SolidBackground : public Background {
public:
explicit SolidBackground(ui::ColorVariant color) { SetColor(color); }
SolidBackground(const SolidBackground&) = delete;
SolidBackground& operator=(const SolidBackground&) = delete;
void Paint(gfx::Canvas* canvas, View* view) const override {
// Fill the background. Note that we don't constrain to the bounds as
// canvas is already clipped for us.
canvas->DrawColor(color().ResolveToSkColor(view->GetColorProvider()));
}
void OnViewThemeChanged(View* view) override {
if (color().IsSemantic()) {
view->SchedulePaint();
}
}
};
// Shared class for RoundedRectBackground and ThemedRoundedRectBackground.
class RoundedRectBackground : public Background {
public:
RoundedRectBackground(ui::ColorVariant color,
const gfx::RoundedCornersF& radii,
const gfx::Insets& insets)
: radii_(radii), insets_(insets) {
SetColor(color);
}
RoundedRectBackground(const RoundedRectBackground&) = delete;
RoundedRectBackground& operator=(const RoundedRectBackground&) = delete;
void Paint(gfx::Canvas* canvas, View* view) const override {
gfx::Rect rect(view->GetLocalBounds());
rect.Inset(insets_);
SkPath path;
SkScalar radii[8] = {radii_.upper_left(), radii_.upper_left(),
radii_.upper_right(), radii_.upper_right(),
radii_.lower_right(), radii_.lower_right(),
radii_.lower_left(), radii_.lower_left()};
path.addRoundRect(gfx::RectToSkRect(rect), radii);
cc::PaintFlags flags;
flags.setAntiAlias(true);
flags.setStyle(cc::PaintFlags::kFill_Style);
flags.setColor(color().ResolveToSkColor(view->GetColorProvider()));
canvas->DrawPath(path, flags);
}
std::optional<gfx::RoundedCornersF> GetRoundedCornerRadii() const override {
return radii_;
}
void OnViewThemeChanged(View* view) override {
if (color().IsSemantic()) {
view->SchedulePaint();
}
}
private:
const gfx::RoundedCornersF radii_;
const gfx::Insets insets_;
};
// ThemedVectorIconBackground is an image drawn on the view's background using
// ThemedVectorIcon to react to theme changes.
class ThemedVectorIconBackground : public Background {
public:
explicit ThemedVectorIconBackground(const ui::ThemedVectorIcon& icon)
: icon_(icon) {
DCHECK(!icon_.empty());
}
ThemedVectorIconBackground(const ThemedVectorIconBackground&) = delete;
ThemedVectorIconBackground& operator=(const ThemedVectorIconBackground&) =
delete;
void OnViewThemeChanged(View* view) override { view->SchedulePaint(); }
void Paint(gfx::Canvas* canvas, View* view) const override {
canvas->DrawImageInt(icon_.GetImageSkia(view->GetColorProvider()), 0, 0);
}
private:
const ui::ThemedVectorIcon icon_;
};
class BackgroundPainter : public Background {
public:
explicit BackgroundPainter(std::unique_ptr<Painter> painter)
: painter_(std::move(painter)) {
DCHECK(painter_);
}
BackgroundPainter(const BackgroundPainter&) = delete;
BackgroundPainter& operator=(const BackgroundPainter&) = delete;
~BackgroundPainter() override = default;
void Paint(gfx::Canvas* canvas, View* view) const override {
Painter::PaintPainterAt(canvas, painter_.get(), view->GetLocalBounds());
}
void SetColor(ui::ColorVariant color) override {
NOTREACHED() << "It does not make sense to `SetColor()` for a painter "
"based background.";
}
private:
std::unique_ptr<Painter> painter_;
};
Background::Background() = default;
Background::~Background() = default;
void Background::SetColor(ui::ColorVariant color) {
color_ = color;
}
void Background::OnViewThemeChanged(View* view) {}
std::optional<gfx::RoundedCornersF> Background::GetRoundedCornerRadii() const {
return std::nullopt;
}
/////////////////////////////////////////////////////////////////////////////
// Factory methods implementations:
/////////////////////////////////////////////////////////////////////////////
std::unique_ptr<Background> CreateSolidBackground(ui::ColorVariant color) {
return std::make_unique<SolidBackground>(color);
}
std::unique_ptr<Background> CreateRoundedRectBackground(
ui::ColorVariant color,
float radius,
int for_border_thickness) {
return CreateRoundedRectBackground(color, gfx::RoundedCornersF{radius},
for_border_thickness);
}
std::unique_ptr<Background> CreateRoundedRectBackground(
ui::ColorVariant color,
float top_radius,
float bottom_radius,
int for_border_thickness) {
return CreateRoundedRectBackground(
color,
gfx::RoundedCornersF{top_radius, top_radius, bottom_radius,
bottom_radius},
for_border_thickness);
}
std::unique_ptr<Background> CreateRoundedRectBackground(
ui::ColorVariant color,
const gfx::RoundedCornersF& radii,
int for_border_thickness) {
return CreateRoundedRectBackground(color, radii,
gfx::Insets(for_border_thickness / 2.0f));
}
std::unique_ptr<Background> CreateRoundedRectBackground(
ui::ColorVariant color,
const gfx::RoundedCornersF& radii,
const gfx::Insets& insets) {
// If the radii is not set, fallback to SolidBackground since it results in
// more efficient tiling by cc. See crbug.com/1464128.
if (radii.IsEmpty() && insets.IsEmpty()) {
return CreateSolidBackground(color);
}
return std::make_unique<RoundedRectBackground>(color, radii, insets);
}
std::unique_ptr<Background> CreateThemedVectorIconBackground(
const ui::ThemedVectorIcon& icon) {
return std::make_unique<ThemedVectorIconBackground>(icon);
}
std::unique_ptr<Background> CreateBackgroundFromPainter(
std::unique_ptr<Painter> painter) {
return std::make_unique<BackgroundPainter>(std::move(painter));
}
} // namespace views
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