ui/native_theme/native_theme_mac.mm

   1 // Copyright (c) 2013 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/native_theme/native_theme_mac.h"
   6
   7 #import <Cocoa/Cocoa.h>
   8
   9 #include "base/basictypes.h"
  10 #include "base/mac/mac_util.h"
  11 #include "base/mac/scoped_cftyperef.h"
  12 #include "base/mac/sdk_forward_declarations.h"
  13 #include "ui/native_theme/common_theme.h"
  14 #import "skia/ext/skia_utils_mac.h"
  15 #include "third_party/skia/include/effects/SkGradientShader.h"
  16 #include "ui/gfx/geometry/rect.h"
  17 #include "ui/gfx/skia_util.h"
  18
  19 namespace {
  20
  21 const SkColor kScrollerTrackGradientColors[] = {
  22     SkColorSetRGB(0xEF, 0xEF, 0xEF),
  23     SkColorSetRGB(0xF9, 0xF9, 0xF9),
  24     SkColorSetRGB(0xFD, 0xFD, 0xFD),
  25     SkColorSetRGB(0xF6, 0xF6, 0xF6) };
  26 const SkColor kScrollerTrackInnerBorderColor = SkColorSetRGB(0xE4, 0xE4, 0xE4);
  27 const SkColor kScrollerTrackOuterBorderColor = SkColorSetRGB(0xEF, 0xEF, 0xEF);
  28 const SkColor kScrollerThumbColor = SkColorSetARGB(0x38, 0, 0, 0);
  29 const SkColor kScrollerThumbHoverColor = SkColorSetARGB(0x80, 0, 0, 0);
  30 const int kScrollerTrackBorderWidth = 1;
  31
  32 // The amount the thumb is inset from both the ends and the sides of the track.
  33 const int kScrollerThumbInset = 3;
  34
  35 // Values calculated by reading pixels and solving simultaneous equations
  36 // derived from "A over B" alpha compositing. Steps: Sample the semi-transparent
  37 // pixel over two backgrounds; P1, P2 over backgrounds B1, B2. Use the color
  38 // value between 0.0 and 1.0 (i.e. divide by 255.0). Then,
  39 // alpha = (P2 - P1 + B1 - B2) / (B1 - B2)
  40 // color = (P1 - B1 + alpha * B1) / alpha.
  41 const SkColor kMenuPopupBackgroundColor = SkColorSetARGB(251, 255, 255, 255);
  42 const SkColor kMenuSeparatorColor = SkColorSetARGB(243, 228, 228, 228);
  43 const SkColor kMenuBorderColor = SkColorSetARGB(60, 0, 0, 0);
  44
  45 // Hardcoded color used for some existing dialogs in Chrome's Cocoa UI.
  46 const SkColor kDialogBackgroundColor = SkColorSetRGB(251, 251, 251);
  47
  48 // On 10.6 and 10.7 there is no way to get components from system colors. Here,
  49 // system colors are just opaque objects that can paint themselves and otherwise
  50 // tell you nothing. In 10.8, some of the system color classes have incomplete
  51 // implementations and throw exceptions even attempting to convert using
  52 // -[NSColor colorUsingColorSpace:], so don't bother there either.
  53 // This function paints a single pixel to a 1x1 swatch and reads it back.
  54 SkColor GetSystemColorUsingSwatch(NSColor* color) {
  55   SkColor swatch;
  56   base::ScopedCFTypeRef<CGColorSpaceRef> color_space(
  57       CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB));
  58   const size_t bytes_per_row = 4;
  59   static_assert(sizeof(swatch) == bytes_per_row, "skcolor should be 4 bytes");
  60   CGBitmapInfo bitmap_info =
  61       kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host;
  62   base::ScopedCFTypeRef<CGContextRef> context(CGBitmapContextCreate(
  63       &swatch, 1, 1, 8, bytes_per_row, color_space, bitmap_info));
  64
  65   NSGraphicsContext* drawing_context =
  66       [NSGraphicsContext graphicsContextWithGraphicsPort:context flipped:NO];
  67   [NSGraphicsContext saveGraphicsState];
  68   [NSGraphicsContext setCurrentContext:drawing_context];
  69   [color drawSwatchInRect:NSMakeRect(0, 0, 1, 1)];
  70   [NSGraphicsContext restoreGraphicsState];
  71   return swatch;
  72 }
  73
  74 // NSColor has a number of methods that return system colors (i.e. controlled by
  75 // user preferences). This function converts the color given by an NSColor class
  76 // method to an SkColor. Official documentation suggests developers only rely on
  77 // +[NSColor selectedTextBackgroundColor] and +[NSColor selectedControlColor],
  78 // but other colors give a good baseline. For many, a gradient is involved; the
  79 // palette chosen based on the enum value given by +[NSColor currentColorTint].
  80 // Apple's documentation also suggests to use NSColorList, but the system color
  81 // list is just populated with class methods on NSColor.
  82 SkColor NSSystemColorToSkColor(NSColor* color) {
  83   if (base::mac::IsOSMountainLionOrEarlier())
  84     return GetSystemColorUsingSwatch(color);
  85
  86   // System colors use the an NSNamedColorSpace called "System", so first step
  87   // is to convert the color into something that can be worked with.
  88   NSColor* device_color =
  89       [color colorUsingColorSpace:[NSColorSpace deviceRGBColorSpace]];
  90   if (device_color)
  91     return gfx::NSDeviceColorToSkColor(device_color);
  92
  93   // Sometimes the conversion is not possible, but we can get an approximation
  94   // by going through a CGColorRef. Note that simply using NSColor methods for
  95   // accessing components for system colors results in exceptions like
  96   // "-numberOfComponents not valid for the NSColor NSNamedColorSpace System
  97   // windowBackgroundColor; need to first convert colorspace." Hence the
  98   // conversion first to CGColor.
  99   CGColorRef cg_color = [color CGColor];
 100   const size_t component_count = CGColorGetNumberOfComponents(cg_color);
 101   if (component_count == 4)
 102     return gfx::CGColorRefToSkColor(cg_color);
 103
 104   CHECK(component_count == 1 || component_count == 2);
 105   // 1-2 components means a grayscale channel and maybe an alpha channel, which
 106   // CGColorRefToSkColor will not like. But RGB is additive, so the conversion
 107   // is easy (RGB to grayscale is less easy).
 108   const CGFloat* components = CGColorGetComponents(cg_color);
 109   CGFloat alpha = component_count == 2 ? components[1] : 1.0;
 110   return SkColorSetARGB(SkScalarRoundToInt(255.0 * alpha),
 111                         SkScalarRoundToInt(255.0 * components[0]),
 112                         SkScalarRoundToInt(255.0 * components[0]),
 113                         SkScalarRoundToInt(255.0 * components[0]));
 114 }
 115
 116 }  // namespace
 117
 118 namespace ui {
 119
 120 // static
 121 NativeTheme* NativeTheme::instance() {
 122   return NativeThemeMac::instance();
 123 }
 124
 125 // static
 126 NativeThemeMac* NativeThemeMac::instance() {
 127   CR_DEFINE_STATIC_LOCAL(NativeThemeMac, s_native_theme, ());
 128   return &s_native_theme;
 129 }
 130
 131 SkColor NativeThemeMac::GetSystemColor(ColorId color_id) const {
 132   // TODO(tapted): Add caching for these, and listen for
 133   // NSSystemColorsDidChangeNotification.
 134   switch (color_id) {
 135     case kColorId_WindowBackground:
 136       return NSSystemColorToSkColor([NSColor windowBackgroundColor]);
 137     case kColorId_DialogBackground:
 138       return kDialogBackgroundColor;
 139
 140     case kColorId_FocusedBorderColor:
 141     case kColorId_FocusedMenuButtonBorderColor:
 142       return NSSystemColorToSkColor([NSColor keyboardFocusIndicatorColor]);
 143     case kColorId_UnfocusedBorderColor:
 144       return NSSystemColorToSkColor([NSColor controlColor]);
 145
 146     // Buttons and labels.
 147     case kColorId_ButtonBackgroundColor:
 148     case kColorId_ButtonHoverBackgroundColor:
 149     case kColorId_HoverMenuButtonBorderColor:
 150     case kColorId_LabelBackgroundColor:
 151       return NSSystemColorToSkColor([NSColor controlBackgroundColor]);
 152     case kColorId_ButtonEnabledColor:
 153     case kColorId_EnabledMenuButtonBorderColor:
 154     case kColorId_LabelEnabledColor:
 155       return NSSystemColorToSkColor([NSColor controlTextColor]);
 156     case kColorId_ButtonDisabledColor:
 157     case kColorId_LabelDisabledColor:
 158       return NSSystemColorToSkColor([NSColor disabledControlTextColor]);
 159     case kColorId_ButtonHighlightColor:
 160     case kColorId_ButtonHoverColor:
 161       return NSSystemColorToSkColor([NSColor selectedControlTextColor]);
 162
 163     // Menus.
 164     case kColorId_EnabledMenuItemForegroundColor:
 165       return NSSystemColorToSkColor([NSColor controlTextColor]);
 166     case kColorId_DisabledMenuItemForegroundColor:
 167     case kColorId_DisabledEmphasizedMenuItemForegroundColor:
 168       return NSSystemColorToSkColor([NSColor disabledControlTextColor]);
 169     case kColorId_SelectedMenuItemForegroundColor:
 170       return NSSystemColorToSkColor([NSColor selectedMenuItemTextColor]);
 171     case kColorId_FocusedMenuItemBackgroundColor:
 172     case kColorId_HoverMenuItemBackgroundColor:
 173       return NSSystemColorToSkColor([NSColor selectedMenuItemColor]);
 174     case kColorId_MenuBackgroundColor:
 175       return kMenuPopupBackgroundColor;
 176     case kColorId_MenuSeparatorColor:
 177       return kMenuSeparatorColor;
 178     case kColorId_MenuBorderColor:
 179       return kMenuBorderColor;
 180
 181     // Text fields.
 182     case kColorId_TextfieldDefaultColor:
 183     case kColorId_TextfieldReadOnlyColor:
 184       return NSSystemColorToSkColor([NSColor textColor]);
 185     case kColorId_TextfieldDefaultBackground:
 186     case kColorId_TextfieldReadOnlyBackground:
 187       return NSSystemColorToSkColor([NSColor textBackgroundColor]);
 188     case kColorId_TextfieldSelectionColor:
 189       return NSSystemColorToSkColor([NSColor selectedTextColor]);
 190     case kColorId_TextfieldSelectionBackgroundFocused:
 191       return NSSystemColorToSkColor([NSColor selectedTextBackgroundColor]);
 192
 193     default:
 194       break;  // TODO(tapted): Handle all values and remove the default case.
 195   }
 196
 197   SkColor color;
 198   if (CommonThemeGetSystemColor(color_id, &color))
 199     return color;
 200
 201   NOTIMPLEMENTED() << " Invalid color_id: " << color_id;
 202   return FallbackTheme::GetSystemColor(color_id);
 203 }
 204
 205 void NativeThemeMac::PaintScrollbarTrack(
 206     SkCanvas* canvas,
 207     Part part,
 208     State state,
 209     const ScrollbarTrackExtraParams& extra_params,
 210     const gfx::Rect& rect) const {
 211   // Emulate the non-overlay scroller style from OSX 10.7 and later.
 212   SkPoint gradient_bounds[2];
 213   if (part == kScrollbarVerticalTrack) {
 214     gradient_bounds[0].set(rect.x(), rect.y());
 215     gradient_bounds[1].set(rect.right(), rect.y());
 216   } else {
 217     DCHECK_EQ(part, kScrollbarHorizontalTrack);
 218     gradient_bounds[0].set(rect.x(), rect.y());
 219     gradient_bounds[1].set(rect.x(), rect.bottom());
 220   }
 221   skia::RefPtr<SkShader> shader = skia::AdoptRef(
 222       SkGradientShader::CreateLinear(gradient_bounds,
 223                                      kScrollerTrackGradientColors,
 224                                      NULL,
 225                                      arraysize(kScrollerTrackGradientColors),
 226                                      SkShader::kClamp_TileMode));
 227   SkPaint gradient;
 228   gradient.setShader(shader.get());
 229
 230   SkIRect track_rect = gfx::RectToSkIRect(rect);
 231   canvas->drawIRect(track_rect, gradient);
 232
 233   // Draw inner and outer line borders.
 234   if (part == kScrollbarVerticalTrack) {
 235     SkPaint paint;
 236     paint.setColor(kScrollerTrackInnerBorderColor);
 237     canvas->drawRectCoords(track_rect.left(),
 238                            track_rect.top(),
 239                            track_rect.left() + kScrollerTrackBorderWidth,
 240                            track_rect.bottom(),
 241                            paint);
 242     paint.setColor(kScrollerTrackOuterBorderColor);
 243     canvas->drawRectCoords(track_rect.right() - kScrollerTrackBorderWidth,
 244                            track_rect.top(),
 245                            track_rect.right(),
 246                            track_rect.bottom(),
 247                            paint);
 248   } else {
 249     SkPaint paint;
 250     paint.setColor(kScrollerTrackInnerBorderColor);
 251     canvas->drawRectCoords(track_rect.left(),
 252                            track_rect.top(),
 253                            track_rect.right(),
 254                            track_rect.top() + kScrollerTrackBorderWidth,
 255                            paint);
 256     paint.setColor(kScrollerTrackOuterBorderColor);
 257     canvas->drawRectCoords(track_rect.left(),
 258                            track_rect.bottom() - kScrollerTrackBorderWidth,
 259                            track_rect.right(),
 260                            track_rect.bottom(),
 261                            paint);
 262   }
 263 }
 264
 265 void NativeThemeMac::PaintScrollbarThumb(SkCanvas* canvas,
 266                                          Part part,
 267                                          State state,
 268                                          const gfx::Rect& rect) const {
 269   gfx::Rect thumb_rect(rect);
 270   switch (part) {
 271     case kScrollbarHorizontalThumb:
 272       thumb_rect.Inset(0, kScrollerTrackBorderWidth, 0, 0);
 273       break;
 274     case kScrollbarVerticalThumb:
 275       thumb_rect.Inset(kScrollerTrackBorderWidth, 0, 0, 0);
 276       break;
 277     default:
 278       NOTREACHED();
 279       break;
 280   }
 281
 282   thumb_rect.Inset(kScrollerThumbInset, kScrollerThumbInset);
 283
 284   SkPaint paint;
 285   paint.setAntiAlias(true);
 286   paint.setColor(state == kHovered ? thumb_active_color_
 287                                    : thumb_inactive_color_);
 288   const SkScalar radius = std::min(rect.width(), rect.height());
 289   canvas->drawRoundRect(gfx::RectToSkRect(thumb_rect), radius, radius, paint);
 290 }
 291
 292 void NativeThemeMac::PaintScrollbarCorner(SkCanvas* canvas,
 293                                           State state,
 294                                           const gfx::Rect& rect) const {
 295   DCHECK_GT(rect.width(), 0);
 296   DCHECK_GT(rect.height(), 0);
 297
 298   // Draw radial gradient from top-left corner.
 299   skia::RefPtr<SkShader> shader = skia::AdoptRef(
 300       SkGradientShader::CreateRadial(SkPoint::Make(rect.x(), rect.y()),
 301                                      rect.width(),
 302                                      kScrollerTrackGradientColors,
 303                                      NULL,
 304                                      arraysize(kScrollerTrackGradientColors),
 305                                      SkShader::kClamp_TileMode));
 306   SkPaint gradient;
 307   gradient.setStyle(SkPaint::kFill_Style);
 308   gradient.setAntiAlias(true);
 309   gradient.setShader(shader.get());
 310   canvas->drawRect(gfx::RectToSkRect(rect), gradient);
 311
 312   // Draw inner border corner point.
 313   canvas->drawPoint(rect.x(), rect.y(), kScrollerTrackInnerBorderColor);
 314
 315   // Draw outer borders.
 316   SkPaint paint;
 317   paint.setColor(kScrollerTrackOuterBorderColor);
 318   canvas->drawRectCoords(rect.right() - kScrollerTrackBorderWidth,
 319                          rect.y(),
 320                          rect.right(),
 321                          rect.bottom(),
 322                          paint);
 323   canvas->drawRectCoords(rect.x(),
 324                          rect.bottom() - kScrollerTrackBorderWidth,
 325                          rect.right(),
 326                          rect.bottom(),
 327                          paint);
 328 }
 329
 330 void NativeThemeMac::PaintMenuPopupBackground(
 331     SkCanvas* canvas,
 332     const gfx::Size& size,
 333     const MenuBackgroundExtraParams& menu_background) const {
 334   canvas->drawColor(kMenuPopupBackgroundColor, SkXfermode::kSrc_Mode);
 335 }
 336
 337 void NativeThemeMac::PaintMenuItemBackground(
 338     SkCanvas* canvas,
 339     State state,
 340     const gfx::Rect& rect,
 341     const MenuListExtraParams& menu_list) const {
 342   SkPaint paint;
 343   switch (state) {
 344     case NativeTheme::kNormal:
 345     case NativeTheme::kDisabled:
 346       // Draw nothing over the regular background.
 347       break;
 348     case NativeTheme::kHovered:
 349       // TODO(tapted): Draw a gradient, and use [NSColor currentControlTint] to
 350       // pick colors. The System color "selectedMenuItemColor" is actually still
 351       // blue for Graphite. And while "keyboardFocusIndicatorColor" does change,
 352       // and is a good shade of gray, it's not blue enough for the Blue theme.
 353       paint.setColor(GetSystemColor(kColorId_HoverMenuItemBackgroundColor));
 354       canvas->drawRect(gfx::RectToSkRect(rect), paint);
 355       break;
 356     default:
 357       NOTREACHED();
 358       break;
 359   }
 360 }
 361
 362 NativeThemeMac::NativeThemeMac() {
 363   set_scrollbar_button_length(0);
 364   SetScrollbarColors(kScrollerThumbColor,
 365                      kScrollerThumbHoverColor,
 366                      kScrollerTrackGradientColors[0]);
 367 }
 368
 369 NativeThemeMac::~NativeThemeMac() {
 370 }
 371
 372 }  // namespace ui