src/cc/blink/scrollbar_impl.cc

   1 // Copyright 2014 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 "cc/blink/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 blink::WebScrollbar;
  12
  13 namespace cc_blink {
  14
  15 ScrollbarImpl::ScrollbarImpl(
  16     scoped_ptr<WebScrollbar> scrollbar,
  17     blink::WebScrollbarThemePainter painter,
  18     scoped_ptr<blink::WebScrollbarThemeGeometry> geometry)
  19     : scrollbar_(scrollbar.Pass()),
  20       painter_(painter),
  21       geometry_(geometry.Pass()) {
  22 }
  23
  24 ScrollbarImpl::~ScrollbarImpl() {
  25 }
  26
  27 cc::ScrollbarOrientation ScrollbarImpl::Orientation() const {
  28   if (scrollbar_->orientation() == WebScrollbar::Horizontal)
  29     return cc::HORIZONTAL;
  30   return cc::VERTICAL;
  31 }
  32
  33 bool ScrollbarImpl::IsLeftSideVerticalScrollbar() const {
  34   return scrollbar_->isLeftSideVerticalScrollbar();
  35 }
  36
  37 bool ScrollbarImpl::HasThumb() const {
  38   return geometry_->hasThumb(scrollbar_.get());
  39 }
  40
  41 bool ScrollbarImpl::IsOverlay() const {
  42   return scrollbar_->isOverlay();
  43 }
  44
  45 gfx::Point ScrollbarImpl::Location() const {
  46   return scrollbar_->location();
  47 }
  48
  49 int ScrollbarImpl::ThumbThickness() const {
  50   gfx::Rect thumb_rect = geometry_->thumbRect(scrollbar_.get());
  51   if (scrollbar_->orientation() == WebScrollbar::Horizontal)
  52     return thumb_rect.height();
  53   return thumb_rect.width();
  54 }
  55
  56 int ScrollbarImpl::ThumbLength() const {
  57   gfx::Rect thumb_rect = geometry_->thumbRect(scrollbar_.get());
  58   if (scrollbar_->orientation() == WebScrollbar::Horizontal)
  59     return thumb_rect.width();
  60   return thumb_rect.height();
  61 }
  62
  63 gfx::Rect ScrollbarImpl::TrackRect() const {
  64   return geometry_->trackRect(scrollbar_.get());
  65 }
  66
  67 void ScrollbarImpl::PaintPart(SkCanvas* canvas,
  68                               cc::ScrollbarPart part,
  69                               const gfx::Rect& content_rect) {
  70   if (part == cc::THUMB) {
  71     painter_.paintThumb(canvas, content_rect);
  72     return;
  73   }
  74
  75   // The following is a simplification of ScrollbarThemeComposite::paint.
  76   painter_.paintScrollbarBackground(canvas, content_rect);
  77
  78   if (geometry_->hasButtons(scrollbar_.get())) {
  79     gfx::Rect back_button_start_paint_rect =
  80         geometry_->backButtonStartRect(scrollbar_.get());
  81     painter_.paintBackButtonStart(canvas, back_button_start_paint_rect);
  82
  83     gfx::Rect back_button_end_paint_rect =
  84         geometry_->backButtonEndRect(scrollbar_.get());
  85     painter_.paintBackButtonEnd(canvas, back_button_end_paint_rect);
  86
  87     gfx::Rect forward_button_start_paint_rect =
  88         geometry_->forwardButtonStartRect(scrollbar_.get());
  89     painter_.paintForwardButtonStart(canvas, forward_button_start_paint_rect);
  90
  91     gfx::Rect forward_button_end_paint_rect =
  92         geometry_->forwardButtonEndRect(scrollbar_.get());
  93     painter_.paintForwardButtonEnd(canvas, forward_button_end_paint_rect);
  94   }
  95
  96   gfx::Rect track_paint_rect = geometry_->trackRect(scrollbar_.get());
  97   painter_.paintTrackBackground(canvas, track_paint_rect);
  98
  99   bool thumb_present = geometry_->hasThumb(scrollbar_.get());
 100   if (thumb_present) {
 101     painter_.paintForwardTrackPart(canvas, track_paint_rect);
 102     painter_.paintBackTrackPart(canvas, track_paint_rect);
 103   }
 104
 105   painter_.paintTickmarks(canvas, track_paint_rect);
 106 }
 107
 108 }  // namespace cc_blink