| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // 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/macros.h" |
| #import "base/mac/scoped_nsobject.h" |
| #include "ui/compositor/layer_animation_observer.h" |
| #include "ui/gfx/animation/slide_animation.h" |
| #import "ui/views/cocoa/views_scrollbar_bridge.h" |
| #include "ui/views/controls/scrollbar/base_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 BaseScrollBar, |
| public ViewsScrollbarBridgeDelegate, |
| public ui::ImplicitAnimationObserver, |
| public gfx::AnimationDelegate { |
| public: |
| explicit CocoaScrollBar(bool horizontal); |
| ~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 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; |
| |
| protected: |
| // BaseScrollBar: |
| gfx::Rect GetTrackBounds() const override; |
| |
| // ScrollBar: |
| int GetThickness() const override; |
| bool OverlapsContent() const override; |
| |
| // View: |
| void Layout() override; |
| gfx::Size CalculatePreferredSize() const override; |
| void OnPaint(gfx::Canvas* canvas) override; |
| |
| private: |
| friend class BaseScrollBar; // For BaseScrollBar::GetHideTimerForTest(). |
| |
| // 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::Timer 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_; |
| |
| // True when the scrollbar is expanded. |
| bool is_expanded_; |
| |
| // 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_; |
| |
| // The bridge for NSScroller. |
| base::scoped_nsobject<ViewsScrollbarBridge> bridge_; |
| |
| DISALLOW_COPY_AND_ASSIGN(CocoaScrollBar); |
| }; |
| |
| } // namespace views |
| |
| #endif // UI_VIEWS_CONTROLS_SCROLLBAR_COCOA_SCROLL_BAR_H_ |