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      1 // Copyright (c) 2011 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 "ui/gfx/canvas.h"
      9 #include "ui/gfx/canvas_skia_paint.h"
     10 #include "third_party/skia/include/effects/SkGradientShader.h"
     11 #include "views/view.h"
     12 
     13 InfoBarBackground::InfoBarBackground(InfoBarDelegate::Type infobar_type)
     14     : separator_color_(SK_ColorBLACK),
     15       top_color_(GetTopColor(infobar_type)),
     16       bottom_color_(GetBottomColor(infobar_type)) {
     17 }
     18 
     19 InfoBarBackground::~InfoBarBackground() {
     20 }
     21 
     22 SkColor InfoBarBackground::GetTopColor(InfoBarDelegate::Type infobar_type) {
     23   static const SkColor kWarningBackgroundColorTop =
     24       SkColorSetRGB(255, 242, 183);
     25   static const SkColor kPageActionBackgroundColorTop =
     26       SkColorSetRGB(218, 231, 249);
     27 
     28   return (infobar_type == InfoBarDelegate::WARNING_TYPE) ?
     29       kWarningBackgroundColorTop : kPageActionBackgroundColorTop;
     30 }
     31 
     32 SkColor InfoBarBackground::GetBottomColor(InfoBarDelegate::Type infobar_type) {
     33   static const SkColor kWarningBackgroundColorBottom =
     34       SkColorSetRGB(250, 230, 145);
     35   static const SkColor kPageActionBackgroundColorBottom =
     36       SkColorSetRGB(179, 202, 231);
     37 
     38   return (infobar_type == InfoBarDelegate::WARNING_TYPE) ?
     39       kWarningBackgroundColorBottom : kPageActionBackgroundColorBottom;
     40 }
     41 
     42 void InfoBarBackground::Paint(gfx::Canvas* canvas, views::View* view) const {
     43   SkPoint gradient_points[2] = {
     44     {SkIntToScalar(0), SkIntToScalar(0)},
     45     {SkIntToScalar(0), SkIntToScalar(view->height())}
     46   };
     47   SkColor gradient_colors[2] = {
     48     top_color_,
     49     bottom_color_
     50   };
     51   SkShader* gradient_shader = SkGradientShader::CreateLinear(
     52       gradient_points, gradient_colors, NULL, 2, SkShader::kClamp_TileMode);
     53   SkPaint paint;
     54   paint.setStrokeWidth(SkIntToScalar(InfoBar::kSeparatorLineHeight));
     55   paint.setStyle(SkPaint::kFill_Style);
     56   paint.setStrokeCap(SkPaint::kRound_Cap);
     57   paint.setShader(gradient_shader);
     58   gradient_shader->unref();
     59 
     60   InfoBarView* infobar = static_cast<InfoBarView*>(view);
     61   gfx::CanvasSkia* canvas_skia = canvas->AsCanvasSkia();
     62   canvas_skia->drawPath(*infobar->fill_path(), paint);
     63 
     64   paint.setShader(NULL);
     65   paint.setColor(SkColorSetA(separator_color_,
     66                              SkColorGetA(gradient_colors[0])));
     67   paint.setStyle(SkPaint::kStroke_Style);
     68   // Anti-alias the path so it doesn't look goofy when the edges are not at 45
     69   // degree angles, but don't anti-alias anything else, especially not the fill,
     70   // lest we get weird color bleeding problems.
     71   paint.setAntiAlias(true);
     72   canvas_skia->drawPath(*infobar->stroke_path(), paint);
     73   paint.setAntiAlias(false);
     74 
     75   // Now draw the separator at the bottom.
     76   canvas->FillRectInt(separator_color_, 0,
     77                       view->height() - InfoBar::kSeparatorLineHeight,
     78                       view->width(), InfoBar::kSeparatorLineHeight);
     79 }
     80