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/gfx/canvas.h"
  12 #include "ui/gfx/skia_util.h"
  13
  14 namespace {
  15
  16 const SkColor kShadowLightColor = SkColorSetARGB(0x0, 0, 0, 0);
  17 const SkColor kShadowDarkColor = SkColorSetARGB(0x70, 0, 0, 0);
  18 const int kShadowThick = 7;
  19
  20 }  // namespace
  21
  22 namespace content {
  23
  24 ShadowLayerDelegate::ShadowLayerDelegate(ui::Layer* shadow_for)
  25     : layer_(new ui::Layer(ui::LAYER_TEXTURED)) {
  26   layer_->set_delegate(this);
  27   layer_->SetBounds(gfx::Rect(-kShadowThick, 0, kShadowThick,
  28                               shadow_for->bounds().height()));
  29   layer_->SetFillsBoundsOpaquely(false);
  30   shadow_for->Add(layer_.get());
  31 }
  32
  33 ShadowLayerDelegate::~ShadowLayerDelegate() {
  34 }
  35
  36 void ShadowLayerDelegate::OnPaintLayer(gfx::Canvas* canvas) {
  37   SkPoint points[2];
  38   const SkColor kShadowColors[2] = { kShadowLightColor, kShadowDarkColor };
  39
  40   points[0].iset(0, 0);
  41   points[1].iset(kShadowThick, 0);
  42
  43   skia::RefPtr<SkShader> shader = skia::AdoptRef(
  44       SkGradientShader::CreateLinear(points, kShadowColors, NULL,
  45           arraysize(points), SkShader::kRepeat_TileMode, NULL));
  46
  47   gfx::Rect paint_rect = gfx::Rect(0, 0, kShadowThick,
  48                                    layer_->bounds().height());
  49   SkPaint paint;
  50   paint.setShader(shader.get());
  51   canvas->sk_canvas()->drawRect(gfx::RectToSkRect(paint_rect), paint);
  52 }
  53
  54 void ShadowLayerDelegate::OnDeviceScaleFactorChanged(float scale_factor) {
  55 }
  56
  57 base::Closure ShadowLayerDelegate::PrepareForLayerBoundsChange() {
  58   return base::Bind(&base::DoNothing);
  59 }
  60
  61 }  // namespace content