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// Copyright 2016 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_COCOA_SCROLL_BAR_H_
#define UI_VIEWS_CONTROLS_SCROLLBAR_COCOA_SCROLL_BAR_H_
#include "base/timer/timer.h"
#import "components/remote_cocoa/app_shim/views_scrollbar_bridge.h"
#include "ui/compositor/layer_animation_observer.h"
#include "ui/gfx/animation/slide_animation.h"
#include "ui/views/controls/scrollbar/scroll_bar.h"
#include "ui/views/views_export.h"
namespace views {
class CocoaScrollBarThumb;
// The transparent scrollbar for Mac which overlays its contents.
class VIEWS_EXPORT CocoaScrollBar : public ScrollBar,
public ViewsScrollbarBridgeDelegate,
public ui::ImplicitAnimationObserver,
public gfx::AnimationDelegate {
METADATA_HEADER(CocoaScrollBar, ScrollBar)
public:
explicit CocoaScrollBar(ScrollBar::Orientation orientation);
CocoaScrollBar(const CocoaScrollBar&) = delete;
CocoaScrollBar& operator=(const CocoaScrollBar&) = delete;
~CocoaScrollBar() override;
// ScrollBar:
void Update(int viewport_size,
int content_size,
int contents_scroll_offset) override;
void ObserveScrollEvent(const ui::ScrollEvent& event) override;
// ViewsScrollbarBridgeDelegate:
void OnScrollerStyleChanged() override;
// View:
bool GetCanProcessEventsWithinSubtree() const override;
bool OnMousePressed(const ui::MouseEvent& event) override;
void OnMouseReleased(const ui::MouseEvent& event) override;
void OnMouseEntered(const ui::MouseEvent& event) override;
void OnMouseExited(const ui::MouseEvent& event) override;
// ui::ImplicitAnimationObserver:
void OnImplicitAnimationsCompleted() override;
// gfx::AnimationDelegate:
void AnimationProgressed(const gfx::Animation* animation) override;
void AnimationEnded(const gfx::Animation* animation) override;
// Returns the scroller style.
NSScrollerStyle GetScrollerStyle() const { return scroller_style_; }
// Returns the thickness of the scrollbar.
int ScrollbarThickness() const;
// Returns true if the opacity is 0.0.
bool IsScrollbarFullyHidden() const;
// Get the parameters for painting.
ui::NativeTheme::ExtraParams GetPainterParams() const;
protected:
// ScrollBar:
gfx::Rect GetTrackBounds() const override;
// ScrollBar:
int GetThickness() const override;
bool OverlapsContent() const override;
// View:
void Layout(PassKey) override;
gfx::Size CalculatePreferredSize(
const SizeBounds& available_size) const override;
void OnPaint(gfx::Canvas* canvas) override;
private:
friend class ScrollBar; // For ScrollBar::GetHideTimerForTesting().
// Methods to change the visibility of the scrollbar.
void ShowScrollbar();
void HideScrollbar();
// Returns true if the scrollbar is in a hover or pressed state.
bool IsHoverOrPressedState() const;
// Updates the thickness of the scrollbar according to the current state of
// the expand animation.
void UpdateScrollbarThickness();
// Resets the scrolltrack and the thickness if the scrollbar is not hidden
// and is not in a hover/pressed state.
void ResetOverlayScrollbar();
// Sets the scrolltrack's visibility and then repaints it.
void SetScrolltrackVisible(bool visible);
// Converts GetThumb() into a CocoaScrollBarThumb object and returns it.
CocoaScrollBarThumb* GetCocoaScrollBarThumb() const;
// Scroller style the scrollbar is using.
NSScrollerStyle scroller_style_;
// Timer that will start the scrollbar's hiding animation when it reaches 0.
base::RetainingOneShotTimer hide_scrollbar_timer_;
// Slide animation that animates the thickness of an overlay scrollbar.
// The animation expands the scrollbar as the showing animation and shrinks
// the scrollbar as the hiding animation.
gfx::SlideAnimation thickness_animation_;
// The scroll offset from the last adjustment to the scrollbar.
int last_contents_scroll_offset_ = 0;
// True when the scrollbar is expanded.
bool is_expanded_ = false;
// True when the scrolltrack should be drawn.
bool has_scrolltrack_;
// True when the scrollbar has started dragging since it was last shown.
// This is set to false when we begin to hide the scrollbar.
bool did_start_dragging_ = false;
// The bridge for NSScroller.
ViewsScrollbarBridge* __strong bridge_;
};
} // namespace views
#endif // UI_VIEWS_CONTROLS_SCROLLBAR_COCOA_SCROLL_BAR_H_
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