solid_color_scrollbar_layer_impl.cc 4.0 KB

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  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. #include "cc/layers/solid_color_scrollbar_layer_impl.h"
  5. #include <algorithm>
  6. #include <memory>
  7. #include "base/memory/ptr_util.h"
  8. #include "cc/trees/layer_tree_impl.h"
  9. #include "cc/trees/layer_tree_settings.h"
  10. #include "cc/trees/occlusion.h"
  11. #include "components/viz/common/quads/solid_color_draw_quad.h"
  12. namespace cc {
  13. std::unique_ptr<SolidColorScrollbarLayerImpl>
  14. SolidColorScrollbarLayerImpl::Create(LayerTreeImpl* tree_impl,
  15. int id,
  16. ScrollbarOrientation orientation,
  17. int thumb_thickness,
  18. int track_start,
  19. bool is_left_side_vertical_scrollbar) {
  20. return base::WrapUnique(new SolidColorScrollbarLayerImpl(
  21. tree_impl, id, orientation, thumb_thickness, track_start,
  22. is_left_side_vertical_scrollbar));
  23. }
  24. SolidColorScrollbarLayerImpl::~SolidColorScrollbarLayerImpl() = default;
  25. std::unique_ptr<LayerImpl> SolidColorScrollbarLayerImpl::CreateLayerImpl(
  26. LayerTreeImpl* tree_impl) const {
  27. return SolidColorScrollbarLayerImpl::Create(
  28. tree_impl, id(), orientation(), thumb_thickness_, track_start_,
  29. is_left_side_vertical_scrollbar());
  30. }
  31. SolidColorScrollbarLayerImpl::SolidColorScrollbarLayerImpl(
  32. LayerTreeImpl* tree_impl,
  33. int id,
  34. ScrollbarOrientation orientation,
  35. int thumb_thickness,
  36. int track_start,
  37. bool is_left_side_vertical_scrollbar)
  38. : ScrollbarLayerImplBase(tree_impl,
  39. id,
  40. orientation,
  41. is_left_side_vertical_scrollbar,
  42. /*is_overlay*/ true),
  43. thumb_thickness_(thumb_thickness),
  44. track_start_(track_start),
  45. color_(tree_impl->settings().solid_color_scrollbar_color) {}
  46. void SolidColorScrollbarLayerImpl::PushPropertiesTo(LayerImpl* layer) {
  47. ScrollbarLayerImplBase::PushPropertiesTo(layer);
  48. DCHECK(!layer->HitTestable());
  49. }
  50. int SolidColorScrollbarLayerImpl::ThumbThickness() const {
  51. if (thumb_thickness_ != -1)
  52. return thumb_thickness_;
  53. if (orientation() == ScrollbarOrientation::HORIZONTAL)
  54. return bounds().height();
  55. else
  56. return bounds().width();
  57. }
  58. int SolidColorScrollbarLayerImpl::ThumbLength() const {
  59. float thumb_length = TrackLength();
  60. if (scroll_layer_length())
  61. thumb_length *= clip_layer_length() / scroll_layer_length();
  62. return std::max(static_cast<int>(thumb_length), ThumbThickness());
  63. }
  64. float SolidColorScrollbarLayerImpl::TrackLength() const {
  65. if (orientation() == ScrollbarOrientation::HORIZONTAL)
  66. return bounds().width() - TrackStart() * 2;
  67. else
  68. return bounds().height() + vertical_adjust() - TrackStart() * 2;
  69. }
  70. int SolidColorScrollbarLayerImpl::TrackStart() const { return track_start_; }
  71. bool SolidColorScrollbarLayerImpl::IsThumbResizable() const {
  72. return true;
  73. }
  74. void SolidColorScrollbarLayerImpl::AppendQuads(
  75. viz::CompositorRenderPass* render_pass,
  76. AppendQuadsData* append_quads_data) {
  77. viz::SharedQuadState* shared_quad_state =
  78. render_pass->CreateAndAppendSharedQuadState();
  79. PopulateSharedQuadState(shared_quad_state, contents_opaque());
  80. AppendDebugBorderQuad(render_pass, gfx::Rect(bounds()), shared_quad_state,
  81. append_quads_data);
  82. gfx::Rect thumb_quad_rect(ComputeThumbQuadRect());
  83. gfx::Rect visible_quad_rect =
  84. draw_properties().occlusion_in_content_space.GetUnoccludedContentRect(
  85. thumb_quad_rect);
  86. if (visible_quad_rect.IsEmpty())
  87. return;
  88. auto* quad = render_pass->CreateAndAppendDrawQuad<viz::SolidColorDrawQuad>();
  89. quad->SetNew(shared_quad_state, thumb_quad_rect, visible_quad_rect, color_,
  90. false);
  91. }
  92. const char* SolidColorScrollbarLayerImpl::LayerTypeAsString() const {
  93. return "cc::SolidColorScrollbarLayerImpl";
  94. }
  95. } // namespace cc