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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/native_theme/native_theme_mac.h"
#import <Cocoa/Cocoa.h>
#include <stddef.h>
#include "base/mac/mac_util.h"
#include "base/mac/sdk_forward_declarations.h"
#include "base/macros.h"
#import "skia/ext/skia_utils_mac.h"
#include "ui/base/material_design/material_design_controller.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/skia_util.h"
#include "ui/native_theme/common_theme.h"
namespace {
// Values calculated by reading pixels and solving simultaneous equations
// derived from "A over B" alpha compositing. Steps: Sample the semi-transparent
// pixel over two backgrounds; P1, P2 over backgrounds B1, B2. Use the color
// value between 0.0 and 1.0 (i.e. divide by 255.0). Then,
// alpha = (P2 - P1 + B1 - B2) / (B1 - B2)
// color = (P1 - B1 + alpha * B1) / alpha.
const SkColor kMenuPopupBackgroundColor = SkColorSetARGB(245, 255, 255, 255);
const SkColor kMenuSeparatorColor = SkColorSetARGB(255, 217, 217, 217);
const SkColor kMenuBorderColor = SkColorSetARGB(60, 0, 0, 0);
const SkColor kMenuPopupBackgroundColorMavericks =
SkColorSetARGB(255, 255, 255, 255);
const SkColor kMenuSeparatorColorMavericks = SkColorSetARGB(243, 228, 228, 228);
// Hardcoded color used for some existing dialogs in Chrome's Cocoa UI.
const SkColor kDialogBackgroundColor = SkColorSetRGB(251, 251, 251);
// Color for the highlighted text in a control when that control doesn't have
// keyboard focus.
const SkColor kUnfocusedSelectedTextBackgroundColor =
SkColorSetRGB(220, 220, 220);
// Helper to make indexing an array by an enum class easier.
template <class KEY, class VALUE>
struct EnumArray {
VALUE& operator[](const KEY& key) { return array[static_cast<size_t>(key)]; }
VALUE array[static_cast<size_t>(KEY::COUNT)];
// NSColor has a number of methods that return system colors (i.e. controlled by
// user preferences). This function converts the color given by an NSColor class
// method to an SkColor. Official documentation suggests developers only rely on
// +[NSColor selectedTextBackgroundColor] and +[NSColor selectedControlColor],
// but other colors give a good baseline. For many, a gradient is involved; the
// palette chosen based on the enum value given by +[NSColor currentColorTint].
// Apple's documentation also suggests to use NSColorList, but the system color
// list is just populated with class methods on NSColor.
SkColor NSSystemColorToSkColor(NSColor* color) {
// System colors use the an NSNamedColorSpace called "System", so first step
// is to convert the color into something that can be worked with.
NSColor* device_color =
[color colorUsingColorSpace:[NSColorSpace deviceRGBColorSpace]];
if (device_color)
return skia::NSDeviceColorToSkColor(device_color);
// Sometimes the conversion is not possible, but we can get an approximation
// by going through a CGColorRef. Note that simply using NSColor methods for
// accessing components for system colors results in exceptions like
// "-numberOfComponents not valid for the NSColor NSNamedColorSpace System
// windowBackgroundColor; need to first convert colorspace." Hence the
// conversion first to CGColor.
CGColorRef cg_color = [color CGColor];
const size_t component_count = CGColorGetNumberOfComponents(cg_color);
if (component_count == 4)
return skia::CGColorRefToSkColor(cg_color);
CHECK(component_count == 1 || component_count == 2);
// 1-2 components means a grayscale channel and maybe an alpha channel, which
// CGColorRefToSkColor will not like. But RGB is additive, so the conversion
// is easy (RGB to grayscale is less easy).
const CGFloat* components = CGColorGetComponents(cg_color);
CGFloat alpha = component_count == 2 ? components[1] : 1.0;
return SkColorSetARGB(SkScalarRoundToInt(255.0 * alpha),
SkScalarRoundToInt(255.0 * components[0]),
SkScalarRoundToInt(255.0 * components[0]),
SkScalarRoundToInt(255.0 * components[0]));
// Converts an SkColor to grayscale by using luminance for all three components.
// Experimentally, this seems to produce a better result than a flat average or
// a min/max average for UI controls.
SkColor ColorToGrayscale(SkColor color) {
SkScalar luminance = SkColorGetR(color) * 0.21 +
SkColorGetG(color) * 0.72 +
SkColorGetB(color) * 0.07;
uint8_t component = SkScalarRoundToInt(luminance);
return SkColorSetARGB(SkColorGetA(color), component, component, component);
} // namespace
namespace ui {
// static
NativeTheme* NativeTheme::GetInstanceForWeb() {
return NativeThemeMac::instance();
// static
NativeTheme* NativeTheme::GetInstanceForNativeUi() {
return NativeThemeMac::instance();
// static
NativeThemeMac* NativeThemeMac::instance() {
CR_DEFINE_STATIC_LOCAL(NativeThemeMac, s_native_theme, ());
return &s_native_theme;
// static
SkColor NativeThemeMac::ApplySystemControlTint(SkColor color) {
if ([NSColor currentControlTint] == NSGraphiteControlTint)
return ColorToGrayscale(color);
return color;
SkColor NativeThemeMac::GetSystemColor(ColorId color_id) const {
// Even with --secondary-ui-md, menus use the platform colors and styling, and
// Mac has a couple of specific color overrides, documented below.
switch (color_id) {
case kColorId_EnabledMenuItemForegroundColor:
return NSSystemColorToSkColor([NSColor controlTextColor]);
case kColorId_DisabledMenuItemForegroundColor:
return NSSystemColorToSkColor([NSColor disabledControlTextColor]);
case kColorId_SelectedMenuItemForegroundColor:
return NSSystemColorToSkColor([NSColor selectedMenuItemTextColor]);
case kColorId_FocusedMenuItemBackgroundColor:
return NSSystemColorToSkColor([NSColor selectedMenuItemColor]);
case kColorId_MenuBackgroundColor:
return kMenuPopupBackgroundColor;
case kColorId_MenuSeparatorColor:
return base::mac::IsOS10_9() ? kMenuSeparatorColorMavericks
: kMenuSeparatorColor;
case kColorId_MenuBorderColor:
return kMenuBorderColor;
// Mac has a different "pressed button" styling because it doesn't use
// ripples.
case kColorId_ButtonPressedShade:
return SkColorSetA(SK_ColorBLACK, 0x10);
// There's a system setting General > Highlight color which sets the
// background color for text selections. We honor that setting.
// TODO(ellyjones): Listen for NSSystemColorsDidChangeNotification somewhere
// and propagate it to the View hierarchy.
case kColorId_LabelTextSelectionBackgroundFocused:
case kColorId_TextfieldSelectionBackgroundFocused:
return NSSystemColorToSkColor([NSColor selectedTextBackgroundColor]);
if (ui::MaterialDesignController::IsSecondaryUiMaterial())
return ApplySystemControlTint(GetAuraColor(color_id, this));
// TODO(tapted): Add caching for these, and listen for
// NSSystemColorsDidChangeNotification.
switch (color_id) {
case kColorId_WindowBackground:
return NSSystemColorToSkColor([NSColor windowBackgroundColor]);
case kColorId_DialogBackground:
return kDialogBackgroundColor;
case kColorId_BubbleBackground:
return SK_ColorWHITE;
case kColorId_FocusedBorderColor:
return NSSystemColorToSkColor([NSColor keyboardFocusIndicatorColor]);
case kColorId_UnfocusedBorderColor:
return NSSystemColorToSkColor([NSColor controlColor]);
// Buttons and labels.
case kColorId_ButtonEnabledColor:
case kColorId_LabelEnabledColor:
case kColorId_ProminentButtonColor:
return NSSystemColorToSkColor([NSColor controlTextColor]);
case kColorId_ButtonDisabledColor:
case kColorId_LabelDisabledColor:
return NSSystemColorToSkColor([NSColor disabledControlTextColor]);
case kColorId_ButtonHoverColor:
return NSSystemColorToSkColor([NSColor selectedControlTextColor]);
case kColorId_LabelTextSelectionColor:
return NSSystemColorToSkColor([NSColor selectedTextColor]);
// Link.
case kColorId_LinkDisabled:
return SK_ColorBLACK;
case kColorId_LinkEnabled:
return SK_ColorBLUE;
case kColorId_LinkPressed:
return SK_ColorRED;
// Text fields.
case kColorId_TextfieldDefaultColor:
case kColorId_TextfieldReadOnlyColor:
return NSSystemColorToSkColor([NSColor textColor]);
case kColorId_TextfieldDefaultBackground:
case kColorId_TextfieldReadOnlyBackground:
return NSSystemColorToSkColor([NSColor textBackgroundColor]);
case kColorId_TextfieldSelectionColor:
return NSSystemColorToSkColor([NSColor selectedTextColor]);
// Trees/Tables. For focused text, use the alternate* versions, which
// NSColor documents as "the table and list view equivalent to the
// selectedControlTextColor".
case kColorId_TreeBackground:
case kColorId_TableBackground:
return NSSystemColorToSkColor([NSColor controlBackgroundColor]);
case kColorId_TreeText:
case kColorId_TableText:
case kColorId_TableSelectedTextUnfocused:
case kColorId_TreeSelectedTextUnfocused:
return NSSystemColorToSkColor([NSColor textColor]);
case kColorId_TreeSelectedText:
case kColorId_TableSelectedText:
return NSSystemColorToSkColor(
[NSColor alternateSelectedControlTextColor]);
case kColorId_TreeSelectionBackgroundFocused:
case kColorId_TableSelectionBackgroundFocused:
return NSSystemColorToSkColor([NSColor alternateSelectedControlColor]);
case kColorId_TreeSelectionBackgroundUnfocused:
case kColorId_TableSelectionBackgroundUnfocused:
return kUnfocusedSelectedTextBackgroundColor;
case kColorId_TableGroupingIndicatorColor:
return SkColorSetRGB(140, 140, 140);
// TODO(tapted): Handle all values and remove the default case.
return GetAuraColor(color_id, this);
void NativeThemeMac::PaintMenuPopupBackground(
cc::PaintCanvas* canvas,
const gfx::Size& size,
const MenuBackgroundExtraParams& menu_background) const {
cc::PaintFlags flags;
if (base::mac::IsOS10_9())
const SkScalar radius = SkIntToScalar(menu_background.corner_radius);
SkRect rect = gfx::RectToSkRect(gfx::Rect(size));
canvas->drawRoundRect(rect, radius, radius, flags);
void NativeThemeMac::PaintMenuItemBackground(
cc::PaintCanvas* canvas,
State state,
const gfx::Rect& rect,
const MenuItemExtraParams& menu_item) const {
cc::PaintFlags flags;
switch (state) {
case NativeTheme::kNormal:
case NativeTheme::kDisabled:
// Draw nothing over the regular background.
case NativeTheme::kHovered:
// TODO(tapted): Draw a gradient, and use [NSColor currentControlTint] to
// pick colors. The System color "selectedMenuItemColor" is actually still
// blue for Graphite. And while "keyboardFocusIndicatorColor" does change,
// and is a good shade of gray, it's not blue enough for the Blue theme.
canvas->drawRect(gfx::RectToSkRect(rect), flags);
NativeThemeMac::NativeThemeMac() {
NativeThemeMac::~NativeThemeMac() {
} // namespace ui