src/cc/layers/solid_color_scrollbar_layer_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 "cc/layers/quad_sink.h"
   6 #include "cc/layers/solid_color_scrollbar_layer_impl.h"
   7 #include "cc/quads/solid_color_draw_quad.h"
   8 #include "cc/trees/layer_tree_impl.h"
   9 #include "cc/trees/layer_tree_settings.h"
  10
  11 namespace cc {
  12
  13 scoped_ptr<SolidColorScrollbarLayerImpl> SolidColorScrollbarLayerImpl::Create(
  14     LayerTreeImpl* tree_impl,
  15     int id,
  16     ScrollbarOrientation orientation,
  17     int thumb_thickness,
  18     bool is_left_side_vertical_scrollbar,
  19     bool is_overlay) {
  20   return make_scoped_ptr(
  21       new SolidColorScrollbarLayerImpl(tree_impl,
  22                                        id,
  23                                        orientation,
  24                                        thumb_thickness,
  25                                        is_left_side_vertical_scrollbar,
  26                                        is_overlay));
  27 }
  28
  29 SolidColorScrollbarLayerImpl::~SolidColorScrollbarLayerImpl() {}
  30
  31 scoped_ptr<LayerImpl> SolidColorScrollbarLayerImpl::CreateLayerImpl(
  32     LayerTreeImpl* tree_impl) {
  33   return SolidColorScrollbarLayerImpl::Create(tree_impl,
  34                                               id(),
  35                                               orientation(),
  36                                               thumb_thickness_,
  37                                               is_left_side_vertical_scrollbar(),
  38                                               is_overlay_scrollbar())
  39       .PassAs<LayerImpl>();
  40 }
  41
  42 SolidColorScrollbarLayerImpl::SolidColorScrollbarLayerImpl(
  43     LayerTreeImpl* tree_impl,
  44     int id,
  45     ScrollbarOrientation orientation,
  46     int thumb_thickness,
  47     bool is_left_side_vertical_scrollbar,
  48     bool is_overlay)
  49     : ScrollbarLayerImplBase(tree_impl,
  50                              id,
  51                              orientation,
  52                              is_left_side_vertical_scrollbar,
  53                              is_overlay),
  54       thumb_thickness_(thumb_thickness),
  55       color_(tree_impl->settings().solid_color_scrollbar_color) {}
  56
  57 void SolidColorScrollbarLayerImpl::PushPropertiesTo(LayerImpl* layer) {
  58   ScrollbarLayerImplBase::PushPropertiesTo(layer);
  59 }
  60
  61 int SolidColorScrollbarLayerImpl::ThumbThickness() const {
  62   if (thumb_thickness_ != -1)
  63     return thumb_thickness_;
  64
  65   if (orientation() == HORIZONTAL)
  66     return bounds().height();
  67   else
  68     return bounds().width();
  69 }
  70
  71 int SolidColorScrollbarLayerImpl::ThumbLength() const {
  72   return std::max(
  73       static_cast<int>(visible_to_total_length_ratio() * TrackLength()),
  74       ThumbThickness());
  75 }
  76
  77 float SolidColorScrollbarLayerImpl::TrackLength() const {
  78   if (orientation() == HORIZONTAL)
  79     return bounds().width();
  80   else
  81     return bounds().height() + vertical_adjust();
  82 }
  83
  84 int SolidColorScrollbarLayerImpl::TrackStart() const {
  85   return 0;
  86 }
  87
  88 bool SolidColorScrollbarLayerImpl::IsThumbResizable() const {
  89   return true;
  90 }
  91
  92 void SolidColorScrollbarLayerImpl::AppendQuads(QuadSink* quad_sink,
  93                            AppendQuadsData* append_quads_data) {
  94   gfx::Rect thumb_quad_rect = ComputeThumbQuadRect();
  95
  96   SharedQuadState* shared_quad_state =
  97       quad_sink->UseSharedQuadState(CreateSharedQuadState());
  98   AppendDebugBorderQuad(quad_sink, shared_quad_state, append_quads_data);
  99
 100   scoped_ptr<SolidColorDrawQuad> quad = SolidColorDrawQuad::Create();
 101   quad->SetNew(shared_quad_state, thumb_quad_rect, color_, false);
 102   quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
 103 }
 104
 105 }  // namespace cc