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// Copyright 2013 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/overlay_scroll_bar.h"
#include <memory>
#include "base/functional/bind.h"
#include "base/i18n/rtl.h"
#include "cc/paint/paint_flags.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/color/color_id.h"
#include "ui/color/color_provider.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/scoped_layer_animation_settings.h"
#include "ui/gfx/canvas.h"
#include "ui/native_theme/overlay_scrollbar_constants_aura.h"
#include "ui/views/background.h"
#include "ui/views/border.h"
#include "ui/views/layout/fill_layout.h"
namespace views {
namespace {
// Total thickness of the thumb (matches visuals when hovered).
constexpr int kThumbThickness =
ui::kOverlayScrollbarThumbWidthPressed + ui::kOverlayScrollbarStrokeWidth;
// When hovered, the thumb takes up the full width. Otherwise, it's a bit
// slimmer.
constexpr int kThumbHoverOffset = 4;
// The layout size of the thumb stroke, in DIP.
constexpr int kThumbStroke = ui::kOverlayScrollbarStrokeWidth;
// The visual size of the thumb stroke, in px.
constexpr int kThumbStrokeVisualSize = ui::kOverlayScrollbarStrokeWidth;
} // namespace
OverlayScrollBar::Thumb::Thumb(OverlayScrollBar* scroll_bar)
: BaseScrollBarThumb(scroll_bar), scroll_bar_(scroll_bar) {
// |scroll_bar| isn't done being constructed; it's not safe to do anything
// that might reference it yet.
}
OverlayScrollBar::Thumb::~Thumb() = default;
void OverlayScrollBar::Thumb::Init() {
SetFlipCanvasOnPaintForRTLUI(true);
SetPaintToLayer();
layer()->SetFillsBoundsOpaquely(false);
// Animate all changes to the layer except the first one.
OnStateChanged();
layer()->SetAnimator(ui::LayerAnimator::CreateImplicitAnimator());
}
gfx::Size OverlayScrollBar::Thumb::CalculatePreferredSize(
const SizeBounds& /*available_size*/) const {
// The visual size of the thumb is kThumbThickness, but it slides back and
// forth by kThumbHoverOffset. To make event targetting work well, expand the
// width of the thumb such that it's always taking up the full width of the
// track regardless of the offset.
return gfx::Size(kThumbThickness + kThumbHoverOffset,
kThumbThickness + kThumbHoverOffset);
}
void OverlayScrollBar::Thumb::OnPaint(gfx::Canvas* canvas) {
const bool hovered = GetState() != Button::STATE_NORMAL;
cc::PaintFlags fill_flags;
fill_flags.setStyle(cc::PaintFlags::kFill_Style);
fill_flags.setColor(GetColorProvider()->GetColor(
hovered ? ui::kColorOverlayScrollbarFillHovered
: ui::kColorOverlayScrollbarFill));
gfx::RectF fill_bounds(GetLocalBounds());
fill_bounds.Inset(gfx::InsetsF::TLBR(IsHorizontal() ? kThumbHoverOffset : 0,
IsHorizontal() ? 0 : kThumbHoverOffset,
0, 0));
fill_bounds.Inset(gfx::InsetsF::TLBR(kThumbStroke, kThumbStroke,
IsHorizontal() ? 0 : kThumbStroke,
IsHorizontal() ? kThumbStroke : 0));
canvas->DrawRect(fill_bounds, fill_flags);
cc::PaintFlags stroke_flags;
stroke_flags.setStyle(cc::PaintFlags::kStroke_Style);
stroke_flags.setColor(GetColorProvider()->GetColor(
hovered ? ui::kColorOverlayScrollbarStrokeHovered
: ui::kColorOverlayScrollbarStroke));
stroke_flags.setStrokeWidth(kThumbStrokeVisualSize);
stroke_flags.setStrokeCap(cc::PaintFlags::kSquare_Cap);
// The stroke is a single pixel, so we must deal with the unscaled canvas.
const float dsf = canvas->UndoDeviceScaleFactor();
gfx::RectF stroke_bounds(fill_bounds);
stroke_bounds.Scale(dsf);
// The stroke should be aligned to the pixel center that is nearest the fill,
// so outset by a half pixel.
stroke_bounds.Inset(gfx::InsetsF(-kThumbStrokeVisualSize / 2.0f));
// The stroke doesn't apply to the far edge of the thumb.
SkPath path;
path.moveTo(gfx::PointFToSkPoint(stroke_bounds.top_right()));
path.lineTo(gfx::PointFToSkPoint(stroke_bounds.origin()));
path.lineTo(gfx::PointFToSkPoint(stroke_bounds.bottom_left()));
if (IsHorizontal()) {
path.moveTo(gfx::PointFToSkPoint(stroke_bounds.bottom_right()));
path.close();
} else {
path.lineTo(gfx::PointFToSkPoint(stroke_bounds.bottom_right()));
}
canvas->DrawPath(path, stroke_flags);
}
void OverlayScrollBar::Thumb::OnBoundsChanged(
const gfx::Rect& previous_bounds) {
scroll_bar_->Show();
// Don't start the hide countdown if the thumb is still hovered or pressed.
if (GetState() == Button::STATE_NORMAL) {
scroll_bar_->StartHideCountdown();
}
}
void OverlayScrollBar::Thumb::OnStateChanged() {
if (GetState() == Button::STATE_NORMAL) {
gfx::Transform translation;
const int direction = base::i18n::IsRTL() ? -1 : 1;
translation.Translate(
gfx::Vector2d(IsHorizontal() ? 0 : direction * kThumbHoverOffset,
IsHorizontal() ? kThumbHoverOffset : 0));
layer()->SetTransform(translation);
if (GetWidget()) {
scroll_bar_->StartHideCountdown();
}
} else {
layer()->SetTransform(gfx::Transform());
}
SchedulePaint();
}
BEGIN_METADATA(OverlayScrollBar, Thumb)
END_METADATA
OverlayScrollBar::OverlayScrollBar(Orientation orientation)
: ScrollBar(orientation) {
SetNotifyEnterExitOnChild(true);
SetPaintToLayer();
layer()->SetMasksToBounds(true);
layer()->SetFillsBoundsOpaquely(false);
// Allow the thumb to take up the whole size of the scrollbar. Layout need
// only set the thumb cross-axis coordinate; ScrollBar::Update() will set the
// thumb size/offset.
SetLayoutManager(std::make_unique<views::FillLayout>());
auto* thumb = new Thumb(this);
SetThumb(thumb);
thumb->Init();
}
OverlayScrollBar::~OverlayScrollBar() = default;
gfx::Insets OverlayScrollBar::GetInsets() const {
return GetOrientation() == Orientation::kHorizontal
? gfx::Insets::TLBR(-kThumbHoverOffset, 0, 0, 0)
: gfx::Insets::TLBR(0, -kThumbHoverOffset, 0, 0);
}
void OverlayScrollBar::OnMouseEntered(const ui::MouseEvent& event) {
Show();
}
void OverlayScrollBar::OnMouseExited(const ui::MouseEvent& event) {
StartHideCountdown();
}
bool OverlayScrollBar::OverlapsContent() const {
return true;
}
gfx::Rect OverlayScrollBar::GetTrackBounds() const {
return GetContentsBounds();
}
int OverlayScrollBar::GetThickness() const {
return kThumbThickness;
}
void OverlayScrollBar::Show() {
layer()->SetOpacity(1.0f);
hide_timer_.Stop();
}
void OverlayScrollBar::Hide() {
ui::ScopedLayerAnimationSettings settings(layer()->GetAnimator());
settings.SetTransitionDuration(ui::kOverlayScrollbarFadeDuration);
layer()->SetOpacity(0.0f);
}
void OverlayScrollBar::StartHideCountdown() {
if (IsMouseHovered()) {
return;
}
hide_timer_.Start(
FROM_HERE, ui::kOverlayScrollbarFadeDelay,
base::BindOnce(&OverlayScrollBar::Hide, base::Unretained(this)));
}
BEGIN_METADATA(OverlayScrollBar)
END_METADATA
} // namespace views
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