shadow_layer_delegate.cc revision 7d4cd473f85ac64c3747c96c277f9e506a0d2246 
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
14namespace {
15
16const SkColor kShadowLightColor = SkColorSetARGB(0x0, 0, 0, 0);
17const SkColor kShadowDarkColor = SkColorSetARGB(0x70, 0, 0, 0);
18const int kShadowThick = 7;
19
20}  // namespace
21
22namespace content {
23
24ShadowLayerDelegate::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
33ShadowLayerDelegate::~ShadowLayerDelegate() {
34}
35
36void 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
54void ShadowLayerDelegate::OnDeviceScaleFactorChanged(float scale_factor) {
55}
56
57base::Closure ShadowLayerDelegate::PrepareForLayerBoundsChange() {
58  return base::Bind(&base::DoNothing);
59}
60
61}  // namespace content
62