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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.
#ifndef UI_VIEWS_CONTROLS_SCROLLBAR_OVERLAY_SCROLL_BAR_H_
#define UI_VIEWS_CONTROLS_SCROLLBAR_OVERLAY_SCROLL_BAR_H_
#include "base/memory/raw_ptr.h"
#include "base/timer/timer.h"
#include "ui/views/controls/scrollbar/base_scroll_bar_thumb.h"
#include "ui/views/controls/scrollbar/scroll_bar.h"
namespace views {
// The transparent scrollbar which overlays its contents.
class VIEWS_EXPORT OverlayScrollBar : public ScrollBar {
METADATA_HEADER(OverlayScrollBar, ScrollBar)
public:
explicit OverlayScrollBar(Orientation orientation);
OverlayScrollBar(const OverlayScrollBar&) = delete;
OverlayScrollBar& operator=(const OverlayScrollBar&) = delete;
~OverlayScrollBar() override;
// ScrollBar:
gfx::Insets GetInsets() const override;
void OnMouseEntered(const ui::MouseEvent& event) override;
void OnMouseExited(const ui::MouseEvent& event) override;
bool OverlapsContent() const override;
gfx::Rect GetTrackBounds() const override;
int GetThickness() const override;
private:
class Thumb : public BaseScrollBarThumb {
METADATA_HEADER(Thumb, BaseScrollBarThumb)
public:
explicit Thumb(OverlayScrollBar* scroll_bar);
Thumb(const Thumb&) = delete;
Thumb& operator=(const Thumb&) = delete;
~Thumb() override;
void Init();
protected:
// BaseScrollBarThumb:
gfx::Size CalculatePreferredSize(
const SizeBounds& /*available_size*/) const override;
void OnPaint(gfx::Canvas* canvas) override;
void OnBoundsChanged(const gfx::Rect& previous_bounds) override;
void OnStateChanged() override;
private:
raw_ptr<OverlayScrollBar> scroll_bar_;
};
friend class Thumb;
// Shows this (effectively, the thumb) without delay.
void Show();
// Hides this with a delay.
void Hide();
// Starts a countdown that hides this when it fires.
void StartHideCountdown();
base::OneShotTimer hide_timer_;
};
} // namespace views
#endif // UI_VIEWS_CONTROLS_SCROLLBAR_OVERLAY_SCROLL_BAR_H_
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