1// Copyright (c) 2012 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 "chrome/browser/ui/views/infobars/infobar_background.h"
6
7#include "chrome/browser/ui/views/infobars/infobar_view.h"
8#include "components/infobars/core/infobar.h"
9#include "third_party/skia/include/effects/SkGradientShader.h"
10#include "ui/gfx/canvas.h"
11#include "ui/gfx/color_utils.h"
12#include "ui/views/view.h"
13
14InfoBarBackground::InfoBarBackground(
15    infobars::InfoBarDelegate::Type infobar_type)
16    : separator_color_(SK_ColorBLACK),
17      top_color_(infobars::InfoBar::GetTopColor(infobar_type)),
18      bottom_color_(infobars::InfoBar::GetBottomColor(infobar_type)) {
19  SetNativeControlColor(
20      color_utils::AlphaBlend(top_color_, bottom_color_, 128));
21}
22
23InfoBarBackground::~InfoBarBackground() {
24}
25
26void InfoBarBackground::Paint(gfx::Canvas* canvas, views::View* view) const {
27  SkPoint gradient_points[2];
28  gradient_points[0].iset(0, 0);
29  gradient_points[1].iset(0, view->height());
30  SkColor gradient_colors[2] = { top_color_, bottom_color_ };
31  skia::RefPtr<SkShader> gradient_shader = skia::AdoptRef(
32      SkGradientShader::CreateLinear(gradient_points, gradient_colors, NULL, 2,
33                                     SkShader::kClamp_TileMode));
34  SkPaint paint;
35  paint.setStrokeWidth(SkIntToScalar(infobars::InfoBar::kSeparatorLineHeight));
36  paint.setStyle(SkPaint::kFill_Style);
37  paint.setStrokeCap(SkPaint::kRound_Cap);
38  paint.setShader(gradient_shader.get());
39
40  InfoBarView* infobar = static_cast<InfoBarView*>(view);
41  SkCanvas* canvas_skia = canvas->sk_canvas();
42  canvas_skia->drawPath(infobar->fill_path(), paint);
43
44  paint.setShader(NULL);
45  paint.setColor(SkColorSetA(separator_color_,
46                             SkColorGetA(gradient_colors[0])));
47  paint.setStyle(SkPaint::kStroke_Style);
48  // Anti-alias the path so it doesn't look goofy when the edges are not at 45
49  // degree angles, but don't anti-alias anything else, especially not the fill,
50  // lest we get weird color bleeding problems.
51  paint.setAntiAlias(true);
52  canvas_skia->drawPath(infobar->stroke_path(), paint);
53  paint.setAntiAlias(false);
54
55  // Now draw the separator at the bottom.
56  canvas->FillRect(
57      gfx::Rect(0, view->height() - infobars::InfoBar::kSeparatorLineHeight,
58                view->width(), infobars::InfoBar::kSeparatorLineHeight),
59      separator_color_);
60}
61