src/ui/views/controls/menu/menu_image_util.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 "ui/views/controls/menu/menu_image_util.h"
   6
   7 #include "base/i18n/rtl.h"
   8 #include "base/logging.h"
   9 #include "grit/ui_resources.h"
  10 #include "third_party/skia/include/effects/SkGradientShader.h"
  11 #include "ui/base/resource/resource_bundle.h"
  12 #include "ui/gfx/canvas.h"
  13 #include "ui/gfx/image/canvas_image_source.h"
  14 #include "ui/gfx/image/image.h"
  15 #include "ui/gfx/image/image_skia.h"
  16 #include "ui/gfx/image/image_skia_source.h"
  17 #include "ui/gfx/point.h"
  18 #include "ui/gfx/size.h"
  19
  20 namespace {
  21
  22 // Size of the radio button inciator.
  23 const int kSelectedIndicatorSize = 5;
  24 const int kIndicatorSize = 10;
  25
  26 // Used for the radio indicator. See theme_draw for details.
  27 const double kGradientStop = .5;
  28 const SkColor kGradient0 = SkColorSetRGB(255, 255, 255);
  29 const SkColor kGradient1 = SkColorSetRGB(255, 255, 255);
  30 const SkColor kGradient2 = SkColorSetRGB(0xD8, 0xD8, 0xD8);
  31 const SkColor kBaseStroke = SkColorSetRGB(0x8F, 0x8F, 0x8F);
  32 const SkColor kRadioButtonIndicatorGradient0 = SkColorSetRGB(0, 0, 0);
  33 const SkColor kRadioButtonIndicatorGradient1 = SkColorSetRGB(0x83, 0x83, 0x83);
  34 const SkColor kIndicatorStroke = SkColorSetRGB(0, 0, 0);
  35
  36 class RadioButtonImageSource : public gfx::CanvasImageSource {
  37  public:
  38   explicit RadioButtonImageSource(bool selected)
  39       : CanvasImageSource(gfx::Size(kIndicatorSize + 2, kIndicatorSize + 2),
  40                           false),
  41         selected_(selected) {
  42   }
  43   virtual ~RadioButtonImageSource() {}
  44
  45   virtual void Draw(gfx::Canvas* canvas) OVERRIDE {
  46     canvas->Translate(gfx::Vector2d(1, 1));
  47
  48     SkPoint gradient_points[3];
  49     gradient_points[0].iset(0, 0);
  50     gradient_points[1].iset(0,
  51                             static_cast<int>(kIndicatorSize * kGradientStop));
  52     gradient_points[2].iset(0, kIndicatorSize);
  53     SkColor gradient_colors[3] = { kGradient0, kGradient1, kGradient2 };
  54     skia::RefPtr<SkShader> shader = skia::AdoptRef(
  55         SkGradientShader::CreateLinear(
  56             gradient_points, gradient_colors, NULL, arraysize(gradient_points),
  57             SkShader::kClamp_TileMode, NULL));
  58     SkPaint paint;
  59     paint.setStyle(SkPaint::kFill_Style);
  60     paint.setAntiAlias(true);
  61     paint.setShader(shader.get());
  62     int radius = kIndicatorSize / 2;
  63     canvas->sk_canvas()->drawCircle(radius, radius, radius, paint);
  64     paint.setStrokeWidth(SkIntToScalar(0));
  65     paint.setShader(NULL);
  66     paint.setStyle(SkPaint::kStroke_Style);
  67     paint.setColor(kBaseStroke);
  68     canvas->sk_canvas()->drawCircle(radius, radius, radius, paint);
  69
  70     if (selected_) {
  71       SkPoint selected_gradient_points[2];
  72       selected_gradient_points[0].iset(0, 0);
  73       selected_gradient_points[1].iset(0, kSelectedIndicatorSize);
  74       SkColor selected_gradient_colors[2] = { kRadioButtonIndicatorGradient0,
  75                                               kRadioButtonIndicatorGradient1 };
  76       shader = skia::AdoptRef(
  77           SkGradientShader::CreateLinear(
  78               selected_gradient_points, selected_gradient_colors, NULL,
  79               arraysize(selected_gradient_points),
  80               SkShader::kClamp_TileMode, NULL));
  81       paint.setShader(shader.get());
  82       paint.setStyle(SkPaint::kFill_Style);
  83       canvas->sk_canvas()->drawCircle(radius, radius,
  84                                       kSelectedIndicatorSize / 2, paint);
  85
  86       paint.setStrokeWidth(SkIntToScalar(0));
  87       paint.setShader(NULL);
  88       paint.setStyle(SkPaint::kStroke_Style);
  89       paint.setColor(kIndicatorStroke);
  90       canvas->sk_canvas()->drawCircle(radius, radius,
  91                                       kSelectedIndicatorSize / 2, paint);
  92     }
  93   }
  94
  95  private:
  96   bool selected_;
  97
  98   DISALLOW_COPY_AND_ASSIGN(RadioButtonImageSource);
  99 };
 100
 101 class SubmenuArrowImageSource : public gfx::CanvasImageSource {
 102  public:
 103   SubmenuArrowImageSource(int image_id)
 104       : gfx::CanvasImageSource(ui::ResourceBundle::GetSharedInstance().
 105             GetImageNamed(image_id).ToImageSkia()->size(), false),
 106         image_id_(image_id) {}
 107   virtual ~SubmenuArrowImageSource() {}
 108
 109   virtual void Draw(gfx::Canvas* canvas) OVERRIDE {
 110     ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 111     const gfx::ImageSkia* r = rb.GetImageNamed(image_id_).ToImageSkia();
 112     canvas->Scale(-1, 1);
 113     canvas->DrawImageInt(*r, - r->width(), 0);
 114   }
 115
 116  private:
 117   static gfx::Size GetSubmenuArrowSize() {
 118     return ui::ResourceBundle::GetSharedInstance()
 119         .GetImageNamed(IDR_MENU_HIERARCHY_ARROW).ToImageSkia()->size();
 120   }
 121
 122   int image_id_;
 123
 124   DISALLOW_COPY_AND_ASSIGN(SubmenuArrowImageSource);
 125 };
 126
 127 gfx::ImageSkia GetRtlSubmenuArrowImage(bool rtl,
 128                                        bool dark_background) {
 129   int image_id = dark_background ? IDR_MENU_HIERARCHY_ARROW_DARK_BACKGROUND :
 130                                    IDR_MENU_HIERARCHY_ARROW;
 131
 132   if (!rtl) {
 133     return ui::ResourceBundle::GetSharedInstance().GetImageNamed(image_id).
 134         AsImageSkia();
 135   }
 136
 137   static gfx::ImageSkia* kRtlArrow = NULL;
 138   static gfx::ImageSkia* kRtlArrowDarkBg = NULL;
 139   gfx::ImageSkia** image = dark_background ? &kRtlArrowDarkBg : &kRtlArrow;
 140
 141   if (!*image) {
 142     SubmenuArrowImageSource* source = new SubmenuArrowImageSource(image_id);
 143     *image = new gfx::ImageSkia(source, source->size());
 144   }
 145
 146   return **image;
 147 }
 148
 149 }  // namespace
 150
 151 namespace views {
 152
 153 gfx::ImageSkia GetMenuCheckImage(bool dark_background) {
 154   int image_id = dark_background ? IDR_MENU_CHECK_CHECKED_DARK_BACKGROUND :
 155                                    IDR_MENU_CHECK_CHECKED;
 156   return ui::ResourceBundle::GetSharedInstance().GetImageNamed(image_id).
 157       AsImageSkia();
 158 }
 159
 160 gfx::ImageSkia GetRadioButtonImage(bool selected) {
 161   int image_id = selected ? IDR_MENU_RADIO_SELECTED : IDR_MENU_RADIO_EMPTY;
 162   return ui::ResourceBundle::GetSharedInstance().GetImageNamed(image_id).
 163       AsImageSkia();
 164 }
 165
 166 gfx::ImageSkia GetSubmenuArrowImage(bool dark_background) {
 167   return GetRtlSubmenuArrowImage(base::i18n::IsRTL(), dark_background);
 168 }
 169
 170 }  // namespace views