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