content/browser/web_contents/aura/shadow_layer_delegate.cc

   1 // Copyright (c) 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 "content/browser/web_contents/aura/shadow_layer_delegate.h"
   6
   7 #include "base/bind.h"
   8 #include "third_party/skia/include/effects/SkGradientShader.h"
   9 #include "ui/aura/window.h"
  10 #include "ui/compositor/layer.h"
  11 #include "ui/compositor/paint_recorder.h"
  12 #include "ui/gfx/canvas.h"
  13 #include "ui/gfx/skia_util.h"
  14
  15 namespace {
  16
  17 const SkColor kShadowLightColor = SkColorSetARGB(0x0, 0, 0, 0);
  18 const SkColor kShadowDarkColor = SkColorSetARGB(0x70, 0, 0, 0);
  19 const int kShadowThick = 7;
  20
  21 }  // namespace
  22
  23 namespace content {
  24
  25 ShadowLayerDelegate::ShadowLayerDelegate(ui::Layer* shadow_for)
  26     : layer_(new ui::Layer(ui::LAYER_TEXTURED)) {
  27   layer_->set_delegate(this);
  28   layer_->SetBounds(gfx::Rect(-kShadowThick, 0, kShadowThick,
  29                               shadow_for->bounds().height()));
  30   layer_->SetFillsBoundsOpaquely(false);
  31   shadow_for->Add(layer_.get());
  32 }
  33
  34 ShadowLayerDelegate::~ShadowLayerDelegate() {
  35 }
  36
  37 void ShadowLayerDelegate::OnPaintLayer(const ui::PaintContext& context) {
  38   SkPoint points[2];
  39   const SkColor kShadowColors[2] = { kShadowLightColor, kShadowDarkColor };
  40
  41   points[0].iset(0, 0);
  42   points[1].iset(kShadowThick, 0);
  43
  44   skia::RefPtr<SkShader> shader = skia::AdoptRef(
  45       SkGradientShader::CreateLinear(points, kShadowColors, NULL,
  46           arraysize(points), SkShader::kRepeat_TileMode));
  47
  48   gfx::Rect paint_rect = gfx::Rect(0, 0, kShadowThick,
  49                                    layer_->bounds().height());
  50   SkPaint paint;
  51   paint.setShader(shader.get());
  52   ui::PaintRecorder recorder(context, layer_->size());
  53   recorder.canvas()->DrawRect(paint_rect, paint);
  54 }
  55
  56 void ShadowLayerDelegate::OnDelegatedFrameDamage(
  57     const gfx::Rect& damage_rect_in_dip) {
  58 }
  59
  60 void ShadowLayerDelegate::OnDeviceScaleFactorChanged(float scale_factor) {
  61 }
  62
  63 base::Closure ShadowLayerDelegate::PrepareForLayerBoundsChange() {
  64   return base::Bind(&base::DoNothing);
  65 }
  66
  67 }  // namespace content