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 "third_party/skia/include/effects/SkGradientShader.h"
  10 #include "ui/base/resource/resource_bundle.h"
  11 #include "ui/gfx/canvas.h"
  12 #include "ui/gfx/image/canvas_image_source.h"
  13 #include "ui/gfx/image/image.h"
  14 #include "ui/gfx/image/image_skia.h"
  15 #include "ui/gfx/image/image_skia_source.h"
  16 #include "ui/gfx/point.h"
  17 #include "ui/gfx/size.h"
  18 #include "ui/resources/grit/ui_resources.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));
  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), SkShader::kClamp_TileMode));
  80       paint.setShader(shader.get());
  81       paint.setStyle(SkPaint::kFill_Style);
  82       canvas->sk_canvas()->drawCircle(radius, radius,
  83                                       kSelectedIndicatorSize / 2, paint);
  84
  85       paint.setStrokeWidth(SkIntToScalar(0));
  86       paint.setShader(NULL);
  87       paint.setStyle(SkPaint::kStroke_Style);
  88       paint.setColor(kIndicatorStroke);
  89       canvas->sk_canvas()->drawCircle(radius, radius,
  90                                       kSelectedIndicatorSize / 2, paint);
  91     }
  92   }
  93
  94  private:
  95   bool selected_;
  96
  97   DISALLOW_COPY_AND_ASSIGN(RadioButtonImageSource);
  98 };
  99
 100 class SubmenuArrowImageSource : public gfx::CanvasImageSource {
 101  public:
 102   SubmenuArrowImageSource(int image_id)
 103       : gfx::CanvasImageSource(ui::ResourceBundle::GetSharedInstance().
 104             GetImageNamed(image_id).ToImageSkia()->size(), false),
 105         image_id_(image_id) {}
 106   virtual ~SubmenuArrowImageSource() {}
 107
 108   virtual void Draw(gfx::Canvas* canvas) OVERRIDE {
 109     ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 110     const gfx::ImageSkia* r = rb.GetImageNamed(image_id_).ToImageSkia();
 111     canvas->Scale(-1, 1);
 112     canvas->DrawImageInt(*r, - r->width(), 0);
 113   }
 114
 115  private:
 116   static gfx::Size GetSubmenuArrowSize() {
 117     return ui::ResourceBundle::GetSharedInstance()
 118         .GetImageNamed(IDR_MENU_HIERARCHY_ARROW).ToImageSkia()->size();
 119   }
 120
 121   int image_id_;
 122
 123   DISALLOW_COPY_AND_ASSIGN(SubmenuArrowImageSource);
 124 };
 125
 126 gfx::ImageSkia GetRtlSubmenuArrowImage(bool rtl,
 127                                        bool dark_background) {
 128   int image_id = dark_background ? IDR_MENU_HIERARCHY_ARROW_DARK_BACKGROUND :
 129                                    IDR_MENU_HIERARCHY_ARROW;
 130
 131   if (!rtl) {
 132     return ui::ResourceBundle::GetSharedInstance().GetImageNamed(image_id).
 133         AsImageSkia();
 134   }
 135
 136   static gfx::ImageSkia* kRtlArrow = NULL;
 137   static gfx::ImageSkia* kRtlArrowDarkBg = NULL;
 138   gfx::ImageSkia** image = dark_background ? &kRtlArrowDarkBg : &kRtlArrow;
 139
 140   if (!*image) {
 141     SubmenuArrowImageSource* source = new SubmenuArrowImageSource(image_id);
 142     *image = new gfx::ImageSkia(source, source->size());
 143   }
 144
 145   return **image;
 146 }
 147
 148 }  // namespace
 149
 150 namespace views {
 151
 152 gfx::ImageSkia GetMenuCheckImage(bool dark_background) {
 153   int image_id = dark_background ? IDR_MENU_CHECK_CHECKED_DARK_BACKGROUND :
 154                                    IDR_MENU_CHECK_CHECKED;
 155   return ui::ResourceBundle::GetSharedInstance().GetImageNamed(image_id).
 156       AsImageSkia();
 157 }
 158
 159 gfx::ImageSkia GetRadioButtonImage(bool selected) {
 160   int image_id = selected ? IDR_MENU_RADIO_SELECTED : IDR_MENU_RADIO_EMPTY;
 161   return ui::ResourceBundle::GetSharedInstance().GetImageNamed(image_id).
 162       AsImageSkia();
 163 }
 164
 165 gfx::ImageSkia GetSubmenuArrowImage(bool dark_background) {
 166   return GetRtlSubmenuArrowImage(base::i18n::IsRTL(), dark_background);
 167 }
 168
 169 }  // namespace views