MacViews: Overlay Scrollbars with Show/Hide Animations

ui/native_theme/native_theme_mac.mm

 // Copyright (c) 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/native_theme/native_theme_mac.h"
 
 #import <Cocoa/Cocoa.h>
 #include <stddef.h>
 
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/mac/sdk_forward_declarations.h"
 #include "base/macros.h"
 #import "skia/ext/skia_utils_mac.h"
 #include "third_party/skia/include/effects/SkGradientShader.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/skia_util.h"
 #include "ui/native_theme/common_theme.h"
 
 namespace {
 
-const SkColor kScrollerTrackGradientColors[] = {
-    SkColorSetRGB(0xEF, 0xEF, 0xEF),
-    SkColorSetRGB(0xF9, 0xF9, 0xF9),
-    SkColorSetRGB(0xFD, 0xFD, 0xFD),
-    SkColorSetRGB(0xF6, 0xF6, 0xF6) };
-const SkColor kScrollerTrackInnerBorderColor = SkColorSetRGB(0xE4, 0xE4, 0xE4);
-const SkColor kScrollerTrackOuterBorderColor = SkColorSetRGB(0xEF, 0xEF, 0xEF);
-const SkColor kScrollerThumbColor = SkColorSetARGB(0x38, 0, 0, 0);
-const SkColor kScrollerThumbHoverColor = SkColorSetARGB(0x80, 0, 0, 0);
-const int kScrollerTrackBorderWidth = 1;
-
-// The amount the thumb is inset from both the ends and the sides of the track.
-const int kScrollerThumbInset = 3;
-
 // Values calculated by reading pixels and solving simultaneous equations
 // derived from "A over B" alpha compositing. Steps: Sample the semi-transparent
 // pixel over two backgrounds; P1, P2 over backgrounds B1, B2. Use the color
 // value between 0.0 and 1.0 (i.e. divide by 255.0). Then,
 // alpha = (P2 - P1 + B1 - B2) / (B1 - B2)
 // color = (P1 - B1 + alpha * B1) / alpha.
 const SkColor kMenuPopupBackgroundColor = SkColorSetARGB(255, 255, 255, 255);
 const SkColor kMenuSeparatorColor = SkColorSetARGB(243, 228, 228, 228);
 const SkColor kMenuBorderColor = SkColorSetARGB(60, 0, 0, 0);
 
@@ skipping 187 matching lines @@
     case kColorId_TreeArrow:
     case kColorId_TableGroupingIndicatorColor:
       return SkColorSetRGB(140, 140, 140);
 
     default:
       // TODO(tapted): Handle all values and remove the default case.
       return GetAuraColor(color_id, this);
   }
 }
 
-void NativeThemeMac::PaintScrollbarTrack(
-    SkCanvas* canvas,
-    Part part,
-    State state,
-    const ScrollbarTrackExtraParams& extra_params,
-    const gfx::Rect& rect) const {
-  // Emulate the non-overlay scroller style from OSX 10.7 and later.
-  SkPoint gradient_bounds[2];
-  if (part == kScrollbarVerticalTrack) {
-    gradient_bounds[0].set(rect.x(), rect.y());
-    gradient_bounds[1].set(rect.right(), rect.y());
-  } else {
-    DCHECK_EQ(part, kScrollbarHorizontalTrack);
-    gradient_bounds[0].set(rect.x(), rect.y());
-    gradient_bounds[1].set(rect.x(), rect.bottom());
-  }
-  skia::RefPtr<SkShader> shader = skia::AdoptRef(
-      SkGradientShader::CreateLinear(gradient_bounds,
-                                     kScrollerTrackGradientColors,
-                                     NULL,
-                                     arraysize(kScrollerTrackGradientColors),
-                                     SkShader::kClamp_TileMode));
-  SkPaint gradient;
-  gradient.setShader(shader.get());
-
-  SkIRect track_rect = gfx::RectToSkIRect(rect);
-  canvas->drawIRect(track_rect, gradient);
-
-  // Draw inner and outer line borders.
-  if (part == kScrollbarVerticalTrack) {
-    SkPaint paint;
-    paint.setColor(kScrollerTrackInnerBorderColor);
-    canvas->drawRectCoords(track_rect.left(),
-                           track_rect.top(),
-                           track_rect.left() + kScrollerTrackBorderWidth,
-                           track_rect.bottom(),
-                           paint);
-    paint.setColor(kScrollerTrackOuterBorderColor);
-    canvas->drawRectCoords(track_rect.right() - kScrollerTrackBorderWidth,
-                           track_rect.top(),
-                           track_rect.right(),
-                           track_rect.bottom(),
-                           paint);
-  } else {
-    SkPaint paint;
-    paint.setColor(kScrollerTrackInnerBorderColor);
-    canvas->drawRectCoords(track_rect.left(),
-                           track_rect.top(),
-                           track_rect.right(),
-                           track_rect.top() + kScrollerTrackBorderWidth,
-                           paint);
-    paint.setColor(kScrollerTrackOuterBorderColor);
-    canvas->drawRectCoords(track_rect.left(),
-                           track_rect.bottom() - kScrollerTrackBorderWidth,
-                           track_rect.right(),
-                           track_rect.bottom(),
-                           paint);
-  }
-}
-
-void NativeThemeMac::PaintScrollbarThumb(SkCanvas* canvas,
-                                         Part part,
-                                         State state,
-                                         const gfx::Rect& rect) const {
-  gfx::Rect thumb_rect(rect);
-  switch (part) {
-    case kScrollbarHorizontalThumb:
-      thumb_rect.Inset(0, kScrollerTrackBorderWidth, 0, 0);
-      break;
-    case kScrollbarVerticalThumb:
-      thumb_rect.Inset(kScrollerTrackBorderWidth, 0, 0, 0);
-      break;
-    default:
-      NOTREACHED();
-      break;
-  }
-
-  thumb_rect.Inset(kScrollerThumbInset, kScrollerThumbInset);
-
-  SkPaint paint;
-  paint.setAntiAlias(true);
-  paint.setColor(state == kHovered ? thumb_active_color_
-                                   : thumb_inactive_color_);
-  const SkScalar radius = std::min(rect.width(), rect.height());
-  canvas->drawRoundRect(gfx::RectToSkRect(thumb_rect), radius, radius, paint);
-}
-
-void NativeThemeMac::PaintScrollbarCorner(SkCanvas* canvas,
-                                          State state,
-                                          const gfx::Rect& rect) const {
-  DCHECK_GT(rect.width(), 0);
-  DCHECK_GT(rect.height(), 0);
-
-  // Draw radial gradient from top-left corner.
-  skia::RefPtr<SkShader> shader = skia::AdoptRef(
-      SkGradientShader::CreateRadial(SkPoint::Make(rect.x(), rect.y()),
-                                     rect.width(),
-                                     kScrollerTrackGradientColors,
-                                     NULL,
-                                     arraysize(kScrollerTrackGradientColors),
-                                     SkShader::kClamp_TileMode));
-  SkPaint gradient;
-  gradient.setStyle(SkPaint::kFill_Style);
-  gradient.setAntiAlias(true);
-  gradient.setShader(shader.get());
-  canvas->drawRect(gfx::RectToSkRect(rect), gradient);
-
-  // Draw inner border corner point.
-  canvas->drawPoint(rect.x(), rect.y(), kScrollerTrackInnerBorderColor);
-
-  // Draw outer borders.
-  SkPaint paint;
-  paint.setColor(kScrollerTrackOuterBorderColor);
-  canvas->drawRectCoords(rect.right() - kScrollerTrackBorderWidth,
-                         rect.y(),
-                         rect.right(),
-                         rect.bottom(),
-                         paint);
-  canvas->drawRectCoords(rect.x(),
-                         rect.bottom() - kScrollerTrackBorderWidth,
-                         rect.right(),
-                         rect.bottom(),
-                         paint);
-}
-
 void NativeThemeMac::PaintMenuPopupBackground(
     SkCanvas* canvas,
     const gfx::Size& size,
     const MenuBackgroundExtraParams& menu_background) const {
   SkPaint paint;
   paint.setAntiAlias(true);
   if (base::mac::IsOSYosemiteOrLater())
     paint.setColor(kMenuPopupBackgroundColorYosemite);
   else
     paint.setColor(kMenuPopupBackgroundColor);
@@ skipping 21 matching lines @@
       paint.setColor(GetSystemColor(kColorId_HoverMenuItemBackgroundColor));
       canvas->drawRect(gfx::RectToSkRect(rect), paint);
       break;
     default:
       NOTREACHED();
       break;
   }
 }
 
 NativeThemeMac::NativeThemeMac() {
-  set_scrollbar_button_length(0);
-  SetScrollbarColors(kScrollerThumbColor,
-                     kScrollerThumbHoverColor,
-                     kScrollerTrackGradientColors[0]);
 }
 
 NativeThemeMac::~NativeThemeMac() {
 }
 
 }  // namespace ui