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/infobar_container_delegate.h"
   8 #include "chrome/browser/ui/views/infobars/infobar_view.h"
   9 #include "components/infobars/core/infobar.h"
  10 #include "third_party/skia/include/effects/SkGradientShader.h"
  11 #include "ui/gfx/canvas.h"
  12 #include "ui/gfx/color_utils.h"
  13 #include "ui/views/view.h"
  14
  15 InfoBarBackground::InfoBarBackground(
  16     infobars::InfoBarDelegate::Type infobar_type)
  17     : separator_color_(SK_ColorBLACK),
  18       top_color_(infobars::InfoBar::GetTopColor(infobar_type)),
  19       bottom_color_(infobars::InfoBar::GetBottomColor(infobar_type)) {
  20   SetNativeControlColor(
  21       color_utils::AlphaBlend(top_color_, bottom_color_, 128));
  22 }
  23
  24 InfoBarBackground::~InfoBarBackground() {
  25 }
  26
  27 void InfoBarBackground::Paint(gfx::Canvas* canvas, views::View* view) const {
  28   SkPoint gradient_points[2];
  29   gradient_points[0].iset(0, 0);
  30   gradient_points[1].iset(0, view->height());
  31   SkColor gradient_colors[2] = { top_color_, bottom_color_ };
  32   skia::RefPtr<SkShader> gradient_shader = skia::AdoptRef(
  33       SkGradientShader::CreateLinear(gradient_points, gradient_colors, NULL, 2,
  34                                      SkShader::kClamp_TileMode));
  35   SkPaint paint;
  36   paint.setStrokeWidth(
  37       SkIntToScalar(InfoBarContainerDelegate::kSeparatorLineHeight));
  38   paint.setStyle(SkPaint::kFill_Style);
  39   paint.setStrokeCap(SkPaint::kRound_Cap);
  40   paint.setShader(gradient_shader.get());
  41
  42   InfoBarView* infobar = static_cast<InfoBarView*>(view);
  43   SkCanvas* canvas_skia = canvas->sk_canvas();
  44   canvas_skia->drawPath(infobar->fill_path(), paint);
  45
  46   paint.setShader(NULL);
  47   paint.setColor(SkColorSetA(separator_color_,
  48                              SkColorGetA(gradient_colors[0])));
  49   paint.setStyle(SkPaint::kStroke_Style);
  50   // Anti-alias the path so it doesn't look goofy when the edges are not at 45
  51   // degree angles, but don't anti-alias anything else, especially not the fill,
  52   // lest we get weird color bleeding problems.
  53   paint.setAntiAlias(true);
  54   canvas_skia->drawPath(infobar->stroke_path(), paint);
  55   paint.setAntiAlias(false);
  56
  57   // Now draw the separator at the bottom.
  58   canvas->FillRect(
  59       gfx::Rect(0,
  60                 view->height() - InfoBarContainerDelegate::kSeparatorLineHeight,
  61                 view->width(), InfoBarContainerDelegate::kSeparatorLineHeight),
  62       separator_color_);
  63 }