ui/views/controls/scrollbar/overlay_scroll_bar.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_VIEWS_CONTROLS_SCROLLBAR_OVERLAY_SCROLL_BAR_H_
   6 #define UI_VIEWS_CONTROLS_SCROLLBAR_OVERLAY_SCROLL_BAR_H_
   7
   8 #include "ui/gfx/animation/slide_animation.h"
   9 #include "ui/views/controls/scrollbar/base_scroll_bar.h"
  10
  11 namespace views {
  12
  13 // The transparent scrollbar which overlays its contents.
  14 class VIEWS_EXPORT OverlayScrollBar : public BaseScrollBar {
  15  public:
  16   explicit OverlayScrollBar(bool horizontal);
  17   ~OverlayScrollBar() override;
  18
  19  protected:
  20   // BaseScrollBar overrides:
  21   gfx::Rect GetTrackBounds() const override;
  22   void OnGestureEvent(ui::GestureEvent* event) override;
  23
  24   // ScrollBar overrides:
  25   int GetLayoutSize() const override;
  26   int GetContentOverlapSize() const override;
  27   void OnMouseEnteredScrollView(const ui::MouseEvent& event) override;
  28   void OnMouseExitedScrollView(const ui::MouseEvent& event) override;
  29
  30   // View overrides:
  31   gfx::Size GetPreferredSize() const override;
  32   void Layout() override;
  33   void OnPaint(gfx::Canvas* canvas) override;
  34
  35  private:
  36   gfx::SlideAnimation animation_;
  37   DISALLOW_COPY_AND_ASSIGN(OverlayScrollBar);
  38 };
  39
  40 }  // namespace views
  41
  42 #endif  // UI_VIEWS_CONTROLS_SCROLLBAR_OVERLAY_SCROLL_BAR_H_