src/webkit/renderer/compositor_bindings/scrollbar_impl.cc

   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 #include "webkit/renderer/compositor_bindings/scrollbar_impl.h"
   6
   7 #include "base/logging.h"
   8 #include "third_party/WebKit/public/platform/WebScrollbar.h"
   9 #include "third_party/WebKit/public/platform/WebScrollbarThemeGeometry.h"
  10
  11 using WebKit::WebScrollbar;
  12
  13 namespace webkit {
  14
  15 ScrollbarImpl::ScrollbarImpl(
  16     scoped_ptr<WebScrollbar> scrollbar,
  17     WebKit::WebScrollbarThemePainter painter,
  18     scoped_ptr<WebKit::WebScrollbarThemeGeometry> geometry)
  19     : scrollbar_(scrollbar.Pass()),
  20       painter_(painter),
  21       geometry_(geometry.Pass()) {}
  22
  23 ScrollbarImpl::~ScrollbarImpl() {}
  24
  25 cc::ScrollbarOrientation ScrollbarImpl::Orientation() const {
  26   if (scrollbar_->orientation() == WebScrollbar::Horizontal)
  27     return cc::HORIZONTAL;
  28   return cc::VERTICAL;
  29 }
  30
  31 bool ScrollbarImpl::IsLeftSideVerticalScrollbar() const {
  32   return scrollbar_->isLeftSideVerticalScrollbar();
  33 }
  34
  35 bool ScrollbarImpl::HasThumb() const {
  36   return geometry_->hasThumb(scrollbar_.get());
  37 }
  38
  39 bool ScrollbarImpl::IsOverlay() const {
  40   return scrollbar_->isOverlay();
  41 }
  42
  43 gfx::Point ScrollbarImpl::Location() const {
  44   return scrollbar_->location();
  45 }
  46
  47 int ScrollbarImpl::ThumbThickness() const {
  48   gfx::Rect thumb_rect = geometry_->thumbRect(scrollbar_.get());
  49   if (scrollbar_->orientation() == WebScrollbar::Horizontal)
  50     return thumb_rect.height();
  51   return thumb_rect.width();
  52 }
  53
  54 int ScrollbarImpl::ThumbLength() const {
  55   gfx::Rect thumb_rect = geometry_->thumbRect(scrollbar_.get());
  56   if (scrollbar_->orientation() == WebScrollbar::Horizontal)
  57     return thumb_rect.width();
  58   return thumb_rect.height();
  59 }
  60
  61 gfx::Rect ScrollbarImpl::TrackRect() const {
  62   return geometry_->trackRect(scrollbar_.get());
  63 }
  64
  65 void ScrollbarImpl::PaintPart(
  66     SkCanvas* canvas, cc::ScrollbarPart part, gfx::Rect content_rect) {
  67   if (part == cc::THUMB) {
  68     painter_.paintThumb(canvas, content_rect);
  69     return;
  70   }
  71
  72   // The following is a simplification of ScrollbarThemeComposite::paint.
  73   painter_.paintScrollbarBackground(canvas, content_rect);
  74
  75   if (geometry_->hasButtons(scrollbar_.get())) {
  76     gfx::Rect back_button_start_paint_rect =
  77         geometry_->backButtonStartRect(scrollbar_.get());
  78     painter_.paintBackButtonStart(canvas, back_button_start_paint_rect);
  79
  80     gfx::Rect back_button_end_paint_rect =
  81         geometry_->backButtonEndRect(scrollbar_.get());
  82     painter_.paintBackButtonEnd(canvas, back_button_end_paint_rect);
  83
  84     gfx::Rect forward_button_start_paint_rect =
  85         geometry_->forwardButtonStartRect(scrollbar_.get());
  86     painter_.paintForwardButtonStart(canvas,
  87                                       forward_button_start_paint_rect);
  88
  89     gfx::Rect forward_button_end_paint_rect =
  90         geometry_->forwardButtonEndRect(scrollbar_.get());
  91     painter_.paintForwardButtonEnd(canvas, forward_button_end_paint_rect);
  92   }
  93
  94   gfx::Rect track_paint_rect = geometry_->trackRect(scrollbar_.get());
  95   painter_.paintTrackBackground(canvas, track_paint_rect);
  96
  97   bool thumb_present = geometry_->hasThumb(scrollbar_.get());
  98   if (thumb_present) {
  99     painter_.paintForwardTrackPart(canvas, track_paint_rect);
 100     painter_.paintBackTrackPart(canvas, track_paint_rect);
 101   }
 102
 103   painter_.paintTickmarks(canvas, track_paint_rect);
 104 }
 105
 106 }  // namespace webkit