chrome/browser/ui/views/infobars/infobar_background.cc

   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
  14 InfoBarBackground::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
  23 InfoBarBackground::~InfoBarBackground() {
  24 }
  25
  26 void 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 }