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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/controls/scrollbar/scroll_bar_views.h"
#include <algorithm>
#include <memory>
#include <utility>
#include <variant>
#include "base/check.h"
#include "base/memory/raw_ptr.h"
#include "base/notreached.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/events/keycodes/keyboard_codes.h"
#include "ui/gfx/canvas.h"
#include "ui/views/controls/button/button.h"
#include "ui/views/controls/focusable_border.h"
#include "ui/views/controls/scrollbar/base_scroll_bar_thumb.h"
#include "ui/views/controls/scrollbar/scroll_bar.h"
#include "ui/views/controls/scrollbar/scroll_bar_button.h"
#include "ui/views/layout/flex_layout.h"
#include "ui/views/view_class_properties.h"
namespace views {
namespace {
// Wrapper for the scroll thumb
class ScrollBarThumb : public BaseScrollBarThumb {
METADATA_HEADER(ScrollBarThumb, BaseScrollBarThumb)
public:
explicit ScrollBarThumb(ScrollBar* scroll_bar);
~ScrollBarThumb() override;
// BaseScrollBarThumb:
gfx::Size CalculatePreferredSize(
const SizeBounds& available_size) const override;
protected:
void OnPaint(gfx::Canvas* canvas) override;
void OnThemeChanged() override;
private:
ui::NativeTheme::ExtraParams GetNativeThemeParams() const;
ui::NativeTheme::Part GetNativeThemePart() const;
ui::NativeTheme::State GetNativeThemeState() const;
raw_ptr<ScrollBar> scroll_bar_;
};
ScrollBarThumb::ScrollBarThumb(ScrollBar* scroll_bar)
: BaseScrollBarThumb(scroll_bar), scroll_bar_(scroll_bar) {}
ScrollBarThumb::~ScrollBarThumb() = default;
gfx::Size ScrollBarThumb::CalculatePreferredSize(
const SizeBounds& /*available_size*/) const {
if (!GetWidget()) {
return gfx::Size();
}
return GetNativeTheme()->GetPartSize(
GetNativeThemePart(), GetNativeThemeState(), GetNativeThemeParams());
}
void ScrollBarThumb::OnPaint(gfx::Canvas* canvas) {
const gfx::Rect local_bounds(GetLocalBounds());
const ui::NativeTheme::State theme_state = GetNativeThemeState();
const ui::NativeTheme::ExtraParams extra_params(GetNativeThemeParams());
GetNativeTheme()->Paint(canvas->sk_canvas(), GetColorProvider(),
GetNativeThemePart(), theme_state, local_bounds,
extra_params);
const ui::NativeTheme::Part gripper_part =
scroll_bar_->GetOrientation() == ScrollBar::Orientation::kHorizontal
? ui::NativeTheme::kScrollbarHorizontalGripper
: ui::NativeTheme::kScrollbarVerticalGripper;
GetNativeTheme()->Paint(canvas->sk_canvas(), GetColorProvider(), gripper_part,
theme_state, local_bounds, extra_params);
}
void ScrollBarThumb::OnThemeChanged() {
BaseScrollBarThumb::OnThemeChanged();
PreferredSizeChanged();
}
ui::NativeTheme::ExtraParams ScrollBarThumb::GetNativeThemeParams() const {
// This gives the behavior we want.
ui::NativeTheme::ScrollbarThumbExtraParams scrollbar_thumb;
scrollbar_thumb.is_hovering = (GetState() != Button::STATE_HOVERED);
return ui::NativeTheme::ExtraParams(scrollbar_thumb);
}
ui::NativeTheme::Part ScrollBarThumb::GetNativeThemePart() const {
if (scroll_bar_->GetOrientation() == ScrollBar::Orientation::kHorizontal) {
return ui::NativeTheme::kScrollbarHorizontalThumb;
}
return ui::NativeTheme::kScrollbarVerticalThumb;
}
ui::NativeTheme::State ScrollBarThumb::GetNativeThemeState() const {
switch (GetState()) {
case Button::STATE_HOVERED:
return ui::NativeTheme::kHovered;
case Button::STATE_PRESSED:
return ui::NativeTheme::kPressed;
case Button::STATE_DISABLED:
return ui::NativeTheme::kDisabled;
case Button::STATE_NORMAL:
return ui::NativeTheme::kNormal;
case Button::STATE_COUNT:
NOTREACHED();
}
}
BEGIN_METADATA(ScrollBarThumb)
END_METADATA
} // namespace
ScrollBarViews::ScrollBarViews(Orientation orientation)
: ScrollBar(orientation) {
SetFlipCanvasOnPaintForRTLUI(true);
state_ = ui::NativeTheme::kNormal;
auto* layout = SetLayoutManager(std::make_unique<views::FlexLayout>());
if (orientation == ScrollBar::Orientation::kVertical) {
layout->SetOrientation(views::LayoutOrientation::kVertical);
}
const auto scroll_func = [](ScrollBarViews* scrollbar, ScrollAmount amount) {
scrollbar->ScrollByAmount(amount);
};
using Type = ScrollBarButton::Type;
prev_button_ = AddChildView(std::make_unique<ScrollBarButton>(
base::BindRepeating(scroll_func, base::Unretained(this),
ScrollAmount::kPrevLine),
orientation == ScrollBar::Orientation::kHorizontal ? Type::kLeft
: Type::kUp));
prev_button_->set_context_menu_controller(this);
SetThumb(new ScrollBarThumb(this));
// Allow the thumb to take up the whole size of the scrollbar, save for the
// prev/next buttons. Layout need only set the thumb cross-axis coordinate;
// ScrollBar::Update() will set the thumb size/offset.
GetThumb()->SetProperty(
views::kFlexBehaviorKey,
views::FlexSpecification(views::MinimumFlexSizeRule::kPreferred,
views::MaximumFlexSizeRule::kUnbounded));
next_button_ = AddChildView(std::make_unique<ScrollBarButton>(
base::BindRepeating(scroll_func, base::Unretained(this),
ScrollBar::ScrollAmount::kNextLine),
orientation == ScrollBar::Orientation::kHorizontal ? Type::kRight
: Type::kDown));
next_button_->set_context_menu_controller(this);
part_ = orientation == ScrollBar::Orientation::kHorizontal
? ui::NativeTheme::kScrollbarHorizontalTrack
: ui::NativeTheme::kScrollbarVerticalTrack;
}
ScrollBarViews::~ScrollBarViews() = default;
// static
int ScrollBarViews::GetVerticalScrollBarWidth(const ui::NativeTheme* theme) {
ui::NativeTheme::ScrollbarArrowExtraParams scrollbar_arrow;
scrollbar_arrow.is_hovering = false;
gfx::Size button_size = theme->GetPartSize(
ui::NativeTheme::kScrollbarUpArrow, ui::NativeTheme::kNormal,
ui::NativeTheme::ExtraParams(scrollbar_arrow));
ui::NativeTheme::ScrollbarThumbExtraParams scrollbar_thumb;
scrollbar_thumb.is_hovering = false;
gfx::Size track_size = theme->GetPartSize(
ui::NativeTheme::kScrollbarVerticalThumb, ui::NativeTheme::kNormal,
ui::NativeTheme::ExtraParams(scrollbar_thumb));
return std::max(track_size.width(), button_size.width());
}
void ScrollBarViews::OnPaint(gfx::Canvas* canvas) {
gfx::Rect bounds = GetTrackBounds();
if (bounds.IsEmpty()) {
return;
}
ui::NativeTheme::ScrollbarTrackExtraParams scrollbar_track;
scrollbar_track.track_x = bounds.x();
scrollbar_track.track_y = bounds.y();
scrollbar_track.track_width = bounds.width();
scrollbar_track.track_height = bounds.height();
scrollbar_track.classic_state = 0;
const BaseScrollBarThumb* thumb = GetThumb();
scrollbar_track.is_upper = true;
ui::NativeTheme::ExtraParams params(scrollbar_track);
gfx::Rect upper_bounds = bounds;
if (GetOrientation() == ScrollBar::Orientation::kHorizontal) {
upper_bounds.set_width(thumb->x() - upper_bounds.x());
} else {
upper_bounds.set_height(thumb->y() - upper_bounds.y());
}
if (!upper_bounds.IsEmpty()) {
GetNativeTheme()->Paint(canvas->sk_canvas(), GetColorProvider(), part_,
state_, upper_bounds, params);
}
scrollbar_track.is_upper = false;
if (GetOrientation() == ScrollBar::Orientation::kHorizontal) {
bounds.Inset(
gfx::Insets::TLBR(0, thumb->bounds().right() - bounds.x(), 0, 0));
} else {
bounds.Inset(
gfx::Insets::TLBR(thumb->bounds().bottom() - bounds.y(), 0, 0, 0));
}
if (!bounds.IsEmpty()) {
GetNativeTheme()->Paint(canvas->sk_canvas(), GetColorProvider(), part_,
state_, bounds, params);
}
}
int ScrollBarViews::GetThickness() const {
const gfx::Size size = GetPreferredSize({});
return GetOrientation() == ScrollBar::Orientation::kHorizontal ? size.height()
: size.width();
}
gfx::Rect ScrollBarViews::GetTrackBounds() const {
gfx::Rect bounds = GetLocalBounds();
gfx::Size size = prev_button_->GetPreferredSize({});
BaseScrollBarThumb* thumb = GetThumb();
if (GetOrientation() == ScrollBar::Orientation::kHorizontal) {
bounds.set_x(bounds.x() + size.width());
bounds.set_width(std::max(0, bounds.width() - 2 * size.width()));
bounds.set_height(thumb->GetPreferredSize({}).height());
} else {
bounds.set_y(bounds.y() + size.height());
bounds.set_height(std::max(0, bounds.height() - 2 * size.height()));
bounds.set_width(thumb->GetPreferredSize({}).width());
}
return bounds;
}
BEGIN_METADATA(ScrollBarViews)
END_METADATA
} // namespace views
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