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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_NATIVE_THEME_NATIVE_THEME_FLUENT_H_
#define UI_NATIVE_THEME_NATIVE_THEME_FLUENT_H_
#include <optional>
#include "base/component_export.h"
#include "ui/native_theme/native_theme_base.h"
namespace gfx {
class Rect;
class RectF;
} // namespace gfx
template <typename T>
class sk_sp;
class SkTypeface;
namespace ui {
class COMPONENT_EXPORT(NATIVE_THEME) NativeThemeFluent
: public NativeThemeBase {
public:
explicit NativeThemeFluent(bool should_only_use_dark_colors);
NativeThemeFluent(const NativeThemeFluent&) = delete;
NativeThemeFluent& operator=(const NativeThemeFluent&) = delete;
~NativeThemeFluent() override;
static NativeThemeFluent* web_instance();
void PaintArrowButton(
cc::PaintCanvas* canvas,
const ColorProvider* color_provider,
const gfx::Rect& rect,
Part direction,
State state,
ColorScheme color_scheme,
bool in_forced_colors,
const ScrollbarArrowExtraParams& extra_params) const override;
void PaintScrollbarTrack(cc::PaintCanvas* canvas,
const ColorProvider* color_provider,
Part part,
State state,
const ScrollbarTrackExtraParams& extra_params,
const gfx::Rect& rect,
ColorScheme color_scheme,
bool in_forced_colors) const override;
void PaintScrollbarThumb(cc::PaintCanvas* canvas,
const ColorProvider* color_provider,
Part part,
State state,
const gfx::Rect& rect,
const ScrollbarThumbExtraParams& extra_params,
ColorScheme color_scheme) const override;
gfx::Insets GetScrollbarSolidColorThumbInsets(Part part) const override;
SkColor4f GetScrollbarThumbColor(
const ui::ColorProvider& color_provider,
State state,
const ScrollbarThumbExtraParams& extra) const override;
void PaintScrollbarCorner(cc::PaintCanvas* canvas,
const ColorProvider* color_provider,
State state,
const gfx::Rect& rect,
const ScrollbarTrackExtraParams& extra_params,
ColorScheme color_scheme) const override;
gfx::Size GetPartSize(Part part,
State state,
const ExtraParams& extra) const override;
int GetPaintedScrollbarTrackInset() const override;
float GetContrastRatioForState(State state, Part part) const override;
private:
friend class NativeThemeFluentTest;
void PaintButton(cc::PaintCanvas* canvas,
const ColorProvider* color_provider,
const gfx::Rect& rect,
Part direction,
ColorScheme color_scheme,
bool in_forced_colors,
const ScrollbarArrowExtraParams& extra_params) const;
void PaintArrow(cc::PaintCanvas* canvas,
const ColorProvider* color_provider,
const gfx::Rect& rect,
Part part,
State state,
ColorScheme color_scheme,
const ScrollbarArrowExtraParams& extra_params) const;
// Calculates and returns the position and dimensions of the scaled arrow rect
// within the scrollbar button rect. The goal is to keep the arrow in the
// center of the button with the applied kFluentScrollbarArrowOffset. See
// OffsetArrowRect method for more details.
gfx::RectF GetArrowRect(const gfx::Rect& rect, Part part, State state) const;
// An arrow rect is a square. Returns the side length based on the state and
// the font availability.
int GetArrowSideLength(State state) const;
// By Fluent design, arrow rect is offset from the center to the side opposite
// from the track rect border by kFluentScrollbarArrowOffset px.
void OffsetArrowRect(gfx::RectF& arrow_rect,
Part part,
int max_arrow_rect_side) const;
// Returns true if the font with arrow icons is present on the device.
bool ArrowIconsAvailable() const {
return typeface_.has_value() && typeface_.value().get();
}
const char* GetArrowCodePointForScrollbarPart(Part part) const;
// Used by Overlay Fluent scrollbars to paint buttons with rounded corners.
void PaintRoundedButton(cc::PaintCanvas* canvas,
SkRect rect,
cc::PaintFlags paint_flags,
NativeTheme::Part direction) const;
// The value stores a shared pointer to SkTypeface with the font family, which
// contains arrow icons. The typeface is lazily loaded the first time
// PaintArrow is called.
mutable std::optional<sk_sp<SkTypeface>> typeface_;
};
} // namespace ui
#endif // UI_NATIVE_THEME_NATIVE_THEME_FLUENT_H_
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