infobar_background.cc revision f2477e01787aa58f445919b809d89e252beef54f 
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/infobars/infobar.h"
8#include "chrome/browser/ui/views/infobars/infobar_view.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(InfoBarDelegate::Type infobar_type)
15    : separator_color_(SK_ColorBLACK),
16      top_color_(InfoBar::GetTopColor(infobar_type)),
17      bottom_color_(InfoBar::GetBottomColor(infobar_type)) {
18  SetNativeControlColor(
19      color_utils::AlphaBlend(top_color_, bottom_color_, 128));
20}
21
22InfoBarBackground::~InfoBarBackground() {
23}
24
25void InfoBarBackground::Paint(gfx::Canvas* canvas, views::View* view) const {
26  SkPoint gradient_points[2];
27  gradient_points[0].iset(0, 0);
28  gradient_points[1].iset(0, view->height());
29  SkColor gradient_colors[2] = { top_color_, bottom_color_ };
30  skia::RefPtr<SkShader> gradient_shader = skia::AdoptRef(
31      SkGradientShader::CreateLinear(gradient_points, gradient_colors, NULL, 2,
32                                     SkShader::kClamp_TileMode));
33  SkPaint paint;
34  paint.setStrokeWidth(SkIntToScalar(InfoBar::kSeparatorLineHeight));
35  paint.setStyle(SkPaint::kFill_Style);
36  paint.setStrokeCap(SkPaint::kRound_Cap);
37  paint.setShader(gradient_shader.get());
38
39  InfoBarView* infobar = static_cast<InfoBarView*>(view);
40  SkCanvas* canvas_skia = canvas->sk_canvas();
41  canvas_skia->drawPath(infobar->fill_path(), paint);
42
43  paint.setShader(NULL);
44  paint.setColor(SkColorSetA(separator_color_,
45                             SkColorGetA(gradient_colors[0])));
46  paint.setStyle(SkPaint::kStroke_Style);
47  // Anti-alias the path so it doesn't look goofy when the edges are not at 45
48  // degree angles, but don't anti-alias anything else, especially not the fill,
49  // lest we get weird color bleeding problems.
50  paint.setAntiAlias(true);
51  canvas_skia->drawPath(infobar->stroke_path(), paint);
52  paint.setAntiAlias(false);
53
54  // Now draw the separator at the bottom.
55  canvas->FillRect(gfx::Rect(0, view->height() - InfoBar::kSeparatorLineHeight,
56                             view->width(), InfoBar::kSeparatorLineHeight),
57                   separator_color_);
58}
59