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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// 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 <utility>
#include "base/check.h"
#include "base/macros.h"
#include "base/scoped_observer.h"
#include "build/build_config.h"
#include "cc/paint/paint_flags.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/color_utils.h"
#include "ui/views/painter.h"
#include "ui/views/view.h"
#include "ui/views/view_observer.h"
#if defined(OS_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(SkColor color) { SetNativeControlColor(color); }
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(get_color());
}
private:
DISALLOW_COPY_AND_ASSIGN(SolidBackground);
};
// RoundedRectBackground is a filled solid colored background that has
// rounded corners.
class RoundedRectBackground : public Background {
public:
RoundedRectBackground(SkColor color, float radius) : radius_(radius) {
SetNativeControlColor(color);
}
void Paint(gfx::Canvas* canvas, View* view) const override {
cc::PaintFlags flags;
flags.setAntiAlias(true);
flags.setStyle(cc::PaintFlags::kFill_Style);
flags.setColor(get_color());
canvas->DrawRoundRect(gfx::RectF(view->GetLocalBounds()), radius_, flags);
}
private:
float radius_;
DISALLOW_COPY_AND_ASSIGN(RoundedRectBackground);
};
// ThemedVectorIconBackground is an image drawn on the view's background using
// ThemedVectorIcon to react to theme changes.
class ThemedVectorIconBackground : public Background, public ViewObserver {
public:
explicit ThemedVectorIconBackground(View* view,
const ui::ThemedVectorIcon& icon)
: icon_(icon), observer_(this) {
DCHECK(!icon_.empty());
observer_.Add(view);
OnViewThemeChanged(view);
}
// ViewObserver:
void OnViewThemeChanged(View* view) override { view->SchedulePaint(); }
void OnViewIsDeleting(View* view) override { observer_.Remove(view); }
void Paint(gfx::Canvas* canvas, View* view) const override {
canvas->DrawImageInt(icon_.GetImageSkia(view->GetNativeTheme()), 0, 0);
}
private:
const ui::ThemedVectorIcon icon_;
ScopedObserver<View, ViewObserver> observer_;
DISALLOW_COPY_AND_ASSIGN(ThemedVectorIconBackground);
};
// ThemedSolidBackground is a solid background that stays in sync with a view's
// native theme.
class ThemedSolidBackground : public SolidBackground, public ViewObserver {
public:
explicit ThemedSolidBackground(View* view, ui::NativeTheme::ColorId color_id)
: SolidBackground(gfx::kPlaceholderColor),
observer_(this),
color_id_(color_id) {
observer_.Add(view);
OnViewThemeChanged(view);
}
~ThemedSolidBackground() override = default;
// ViewObserver:
void OnViewThemeChanged(View* view) override {
SetNativeControlColor(view->GetNativeTheme()->GetSystemColor(color_id_));
view->SchedulePaint();
}
void OnViewIsDeleting(View* view) override { observer_.Remove(view); }
private:
ScopedObserver<View, ViewObserver> observer_;
ui::NativeTheme::ColorId color_id_;
DISALLOW_COPY_AND_ASSIGN(ThemedSolidBackground);
};
class BackgroundPainter : public Background {
public:
explicit BackgroundPainter(std::unique_ptr<Painter> painter)
: painter_(std::move(painter)) {
DCHECK(painter_);
}
~BackgroundPainter() override = default;
void Paint(gfx::Canvas* canvas, View* view) const override {
Painter::PaintPainterAt(canvas, painter_.get(), view->GetLocalBounds());
}
private:
std::unique_ptr<Painter> painter_;
DISALLOW_COPY_AND_ASSIGN(BackgroundPainter);
};
Background::Background() = default;
Background::~Background() = default;
void Background::SetNativeControlColor(SkColor color) {
color_ = color;
}
std::unique_ptr<Background> CreateSolidBackground(SkColor color) {
return std::make_unique<SolidBackground>(color);
}
std::unique_ptr<Background> CreateRoundedRectBackground(SkColor color,
float radius) {
return std::make_unique<RoundedRectBackground>(color, radius);
}
std::unique_ptr<Background> CreateThemedVectorIconBackground(
View* view,
const ui::ThemedVectorIcon& icon) {
return std::make_unique<ThemedVectorIconBackground>(view, icon);
}
std::unique_ptr<Background> CreateThemedSolidBackground(
View* view,
ui::NativeTheme::ColorId color_id) {
return std::make_unique<ThemedSolidBackground>(view, color_id);
}
std::unique_ptr<Background> CreateBackgroundFromPainter(
std::unique_ptr<Painter> painter) {
return std::make_unique<BackgroundPainter>(std::move(painter));
}
} // namespace views
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