Improving the appearance of overlay scrollbars

ui/views/controls/scrollbar/overlay_scroll_bar.cc

 // Copyright 2013 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.
 
 #include "ui/views/controls/scrollbar/overlay_scroll_bar.h"
 
 #include "base/macros.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/canvas.h"
@@ skipping 110 matching lines @@
 OverlayScrollBar::~OverlayScrollBar() {}
 
 gfx::Rect OverlayScrollBar::GetTrackBounds() const {
   gfx::Rect local = GetLocalBounds();
   // The track has to be wide enough for the thumb.
   local.Inset(gfx::Insets(IsHorizontal() ? -kThumbHoverOffset : 0,
                           IsHorizontal() ? 0 : -kThumbHoverOffset, 0, 0));
   return local;
 }
 
-int OverlayScrollBar::GetLayoutSize() const {
-  return 0;
-}
-
-int OverlayScrollBar::GetContentOverlapSize() const {
+int OverlayScrollBar::GetThickness() const {
   return kThumbThickness;
 }
 
+bool OverlayScrollBar::OverlapsContent() const {
+  return true;
+}
+
 void OverlayScrollBar::Layout() {
   gfx::Rect thumb_bounds = GetTrackBounds();
   BaseScrollBarThumb* thumb = GetThumb();
   if (IsHorizontal()) {
     thumb_bounds.set_x(thumb->x());
     thumb_bounds.set_width(thumb->width());
   } else {
     thumb_bounds.set_y(thumb->y());
     thumb_bounds.set_height(thumb->height());
   }
@@ skipping 28 matching lines @@
 
 void OverlayScrollBar::StartHideCountdown() {
   if (IsMouseHovered())
     return;
   hide_timer_.Start(
       FROM_HERE, base::TimeDelta::FromSeconds(1),
       base::Bind(&OverlayScrollBar::Hide, base::Unretained(this)));
 }
 
 }  // namespace views