Implement Material Design for Mac toolbar.

chrome/browser/ui/cocoa/toolbar/toolbar_button_cocoa.mm

Index: chrome/browser/ui/cocoa/toolbar/toolbar_button_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/toolbar/toolbar_button_cocoa.mm b/chrome/browser/ui/cocoa/toolbar/toolbar_button_cocoa.mm
index d8c3acc5b34c3984d33bcc6cc0fad7ff4524aac1..b6d3282dd7bde405d26a0c53719e654b013ec677 100644
--- a/chrome/browser/ui/cocoa/toolbar/toolbar_button_cocoa.mm
+++ b/chrome/browser/ui/cocoa/toolbar/toolbar_button_cocoa.mm
@@ -4,6 +4,180 @@
 
 #import "chrome/browser/ui/cocoa/toolbar/toolbar_button_cocoa.h"
 
+#include "base/mac/foundation_util.h"
+#include "base/mac/sdk_forward_declarations.h"
+#import "chrome/browser/ui/cocoa/image_button_cell.h"
+#import "chrome/browser/ui/cocoa/themed_window.h"
+#import "chrome/browser/ui/cocoa/view_id_util.h"
+#include "skia/ext/skia_utils_mac.h"
+#import "ui/base/cocoa/nsview_additions.h"
+#include "ui/base/material_design/material_design_controller.h"
+#include "ui/base/theme_provider.h"
+#include "ui/gfx/image/image_skia_util_mac.h"
+#include "ui/gfx/paint_vector_icon.h"
+
+namespace {
+
+// The bounds of toolbar buttons in Material Design.
+const NSRect kMDButtonBounds = NSMakeRect(0, 0, 28, 28);
+
+// The size of a toolbar button icon in Material Design. A toolbar button image
+// consists of a border and background, with a centered icon.
+const NSSize kMDButtonIconSize = NSMakeSize(16, 16);
+
+CGFloat LineWidthFromContext(CGContextRef context) {
+  CGRect unitRect = CGRectMake(0.0, 0.0, 1.0, 1.0);
+  CGRect deviceRect = CGContextConvertRectToDeviceSpace(context, unitRect);
+  return 1.0 / deviceRect.size.height;
+}
+
+}  // namespace
+
+// An NSCustomImageRep subclass that creates the "three dots" image of the
+// Material Design browser tools icon.
+@interface BrowserToolsImageRep : NSCustomImageRep
+@property (retain, nonatomic) NSColor* fillColor;
+// NSCustomImageRep delegate method that performs the drawing.
++ (void)drawBrowserToolsIcon:(BrowserToolsImageRep*)imageRep;
+@end
+
+@implementation BrowserToolsImageRep
+
+@synthesize fillColor = fillColor_;
+
+- (void)dealloc {
+  [fillColor_ release];
+  [super dealloc];
+}
+
++ (void)drawBrowserToolsIcon:(BrowserToolsImageRep*)imageRep {
+  [imageRep.fillColor set];
+  NSBezierPath* dotPath =
+      [NSBezierPath bezierPathWithOvalInRect:NSMakeRect(6.5, 1.5, 3, 3)];
+  CGContextRef context = static_cast<CGContextRef>(
+      [[NSGraphicsContext currentContext] graphicsPort]);
+  // Draw the three dots by drawing |dotPath| in three different locations.
+  for (NSUInteger i = 0; i < 3; i++) {
+    [dotPath fill];
+    CGContextTranslateCTM(context, 0, 5);
+  }
+}
+
+@end
+
+// An NSCustomImageRep subclass that draws a Material Design background behind
+// and border around a centered icon image.
+@interface ToolbarButtonImageRep : NSCustomImageRep
+@property (retain, nonatomic) NSImage* icon;
+@property (assign, nonatomic) ToolbarButtonImageBackgroundStyle style;
+// Returns a color containing the gradient used to draw the hover style border.
++ (NSColor*)hoverBorderGradientColor;
+// NSCustomImageRep delegate method that performs the drawing.
++ (void)drawImage:(ToolbarButtonImageRep*)imageRep;
+@end
+
+@implementation ToolbarButtonImageRep
+
+@synthesize icon = icon_;
+@synthesize style = style_;
+
+- (void)dealloc {
+  [icon_ release];
+  [super dealloc];
+}
+
++ (NSColor*)hoverBorderGradientColor {
+  // Create a temporary image.
+  base::scoped_nsobject<NSImage> tmpImage(
+      [[NSImage alloc] initWithSize:kMDButtonBounds.size]);
+
+  // Set up the gradient.
+  NSColor* startingColor = [NSColor colorWithCalibratedWhite:0 alpha:0.11];
+  NSColor* endingColor = [NSColor colorWithCalibratedWhite:0 alpha:0.31];
+  base::scoped_nsobject<NSGradient> gradient(
+      [[NSGradient alloc] initWithStartingColor:startingColor
+                                    endingColor:endingColor]);
+
+  // Fill the temporary image with the gradient.
+  [tmpImage lockFocus];
+  [gradient drawInRect:kMDButtonBounds angle:270];
+  [tmpImage unlockFocus];
+
+  // Return the gradient image as a pattern-based color.
+  return [NSColor colorWithPatternImage:tmpImage];
+}
+
++ (void)drawImage:(ToolbarButtonImageRep*)imageRep {
+  // Inset the bounds by the line width to get a crisp line.
+  CGContextRef context = static_cast<CGContextRef>(
+      [[NSGraphicsContext currentContext] graphicsPort]);
+  CGFloat lineWidth = LineWidthFromContext(context);
+  NSRect destRect =
+      NSInsetRect(kMDButtonBounds, lineWidth * 1.5, lineWidth * 1.5);
+  // Create the bezier used to draw the border.
+  NSBezierPath* roundedRectPath =
+      [NSBezierPath bezierPathWithRoundedRect:destRect xRadius:3 yRadius:3];
+  [roundedRectPath setLineWidth:lineWidth / 2.];
+
+  // Compute the stroke and fill colors.
+  NSColor* strokeColor = nil;
+  NSColor* fillColor = nil;
+  switch (imageRep.style) {
+   case ToolbarButtonImageBackgroundStyle::HOVER:
+     strokeColor = [self hoverBorderGradientColor];
+      strokeColor = [NSColor grayColor];
+     fillColor = [NSColor colorWithCalibratedWhite:1 alpha:0.9];
+     break;
+   case ToolbarButtonImageBackgroundStyle::HOVER_THEMED:
+     strokeColor = [self hoverBorderGradientColor];
+     fillColor = [NSColor colorWithCalibratedWhite:1 alpha:0.2];
+   case ToolbarButtonImageBackgroundStyle::PRESSED:
+     strokeColor = [NSColor colorWithCalibratedWhite:0 alpha:0.22];
+     fillColor = [NSColor colorWithCalibratedWhite:0 alpha:0.05];
+     break;
+   case ToolbarButtonImageBackgroundStyle::PRESSED_THEMED:
+     strokeColor = [NSColor colorWithCalibratedWhite:0 alpha:0.22];
+     fillColor = [NSColor colorWithCalibratedWhite:0 alpha:0.1];
+     break;
+  }
+
+  // Fill and stroke.
+  [fillColor set];
+  [roundedRectPath fill];
+  [strokeColor set];
+  [roundedRectPath stroke];
+
+  // Compute the icon's location and draw it there.
+  CGFloat iconInset =
+      (kMDButtonBounds.size.width - kMDButtonIconSize.width) / 2;
+  NSRect iconDestRect = NSInsetRect(kMDButtonBounds, iconInset, iconInset);
+  [imageRep.icon drawInRect:iconDestRect
+                   fromRect:NSZeroRect
+                  operation:NSCompositeSourceOver
+                   fraction:1];
+}
+
+@end
+
+@interface ToolbarButton ()
+// Returns an image that draws the browser tools button icon using vector
+// commands.
+- (NSImage*)browserToolsIconForFillColor:(SkColor)fillColor;
+// Returns an button image by combining |iconImage| with the specified button
+// background.
+- (NSImage*)imageForIcon:(NSImage*)iconImage
+     withBackgroundStyle:(ToolbarButtonImageBackgroundStyle)style;
+// Creates and assigns images for the button's various states (pressed, hover,
+// etc.).
+- (void)setImagesFromIconId:(gfx::VectorIconId)iconId;
+// Implemented to set the button's icon when added to the browser window. We
+// can't set the image before this because its appearance depends upon the
+// browser window's theme.
+- (void)viewDidMoveToWindow;
+
+@end
+
+
 @implementation ToolbarButton
 
 @synthesize handleMiddleClick = handleMiddleClick_;
@@ -55,4 +229,174 @@
                                    yRadius:2] fill];
 }
 
+- (SkColor)defaultColor:(BOOL)isDarkTheme {
+  const SkColor defaultGrayColor = SkColorSetARGB(0xFF, 0x5A, 0x5A, 0x5A);
+  const SkColor defaultWhiteColor = SkColorSetRGB(0xFF, 0xFF, 0xFF);
+  return isDarkTheme ? defaultWhiteColor : defaultGrayColor;
+}
+
+- (SkColor)disabledColor:(BOOL)isDarkTheme {
+  const SkColor disabledGrayColor = SkColorSetARGB(0x33, 0x5A, 0x5A, 0x5A);
+  const SkColor disabledWhiteColor = SkColorSetARGB(0x33, 0xFF, 0xFF, 0xFF);
+  return isDarkTheme ? disabledWhiteColor : disabledGrayColor;
+}
+
+- (SkColor)pressedColor:(BOOL)isDarkTheme {
+  const SkColor pressedBlueColor = SkColorSetARGB(0xFF, 0x42, 0x85, 0xF4);
+  const SkColor pressedWhiteColor = SkColorSetARGB(0x7F, 0xFF, 0xFF, 0xFF);
+  return isDarkTheme ? pressedWhiteColor : pressedBlueColor;
+}
+
+- (NSImage*)browserToolsIconForFillColor:(SkColor)fillColor {
+  // Create a |BrowserToolsImageRep| to draw the browser tools icon using
+  // the provided fill color.
+  base::scoped_nsobject<BrowserToolsImageRep> imageRep =
+  [[BrowserToolsImageRep alloc]
+      initWithDrawSelector:@selector(drawBrowserToolsIcon:)
+                  delegate:[BrowserToolsImageRep class]];
+  [imageRep setFillColor:skia::SkColorToCalibratedNSColor(fillColor)];
+
+  // Create the image from the image rep.
+  NSImage* browserToolsIcon =
+      [[[NSImage alloc] initWithSize:kMDButtonIconSize] autorelease];
+  [browserToolsIcon setCacheMode:NSImageCacheAlways];
+  [browserToolsIcon addRepresentation:imageRep];
+
+  return browserToolsIcon;
+}
+
+- (NSImage*)imageForIcon:(NSImage*)iconImage
+     withBackgroundStyle:(ToolbarButtonImageBackgroundStyle)style {
+  // Create a |ToolbarButtonImageRep| to draw the button image using
+  // the provided icon and background style.
+  base::scoped_nsobject<ToolbarButtonImageRep> imageRep =
+      [[ToolbarButtonImageRep alloc]
+          initWithDrawSelector:@selector(drawImage:)
+                      delegate:[ToolbarButtonImageRep class]];
+  [imageRep setIcon:iconImage];
+  [imageRep setStyle:style];
+
+  // Create the image from the image rep.
+  NSImage* image =
+      [[[NSImage alloc] initWithSize:kMDButtonBounds.size] autorelease];
+  [image setCacheMode:NSImageCacheAlways];
+  [image addRepresentation:imageRep];
+
+  return image;
+}
+
+- (void)setImagesFromIconId:(gfx::VectorIconId)iconId {
+  // Compute the default, disabled, and hover icon colors.
+  BOOL isDarkTheme = [[self window] hasDarkTheme];
+  SkColor defaultColor = [self defaultColor:isDarkTheme];
+  SkColor disabledColor = [self disabledColor:isDarkTheme];
+  SkColor pressedColor = [self pressedColor:isDarkTheme];
+
+  // Create the default, pressed, and disabled state icons. These icons are
+  // always the same shape, but use a different color.
+  NSImage* defaultIcon = nil;
+  NSImage* pressedIcon = nil;
+  NSImage* disabledIcon = nil;
+  if (iconId == gfx::VectorIconId::BROWSER_TOOLS) {
+    defaultIcon = [self browserToolsIconForFillColor:defaultColor];
+    pressedIcon = [self browserToolsIconForFillColor:pressedColor];
+    disabledIcon = [self browserToolsIconForFillColor:pressedColor];
+  } else {
+    defaultIcon = NSImageFromImageSkia(
+        gfx::CreateVectorIcon(iconId, kMDButtonIconSize.width, defaultColor));
+    pressedIcon = NSImageFromImageSkia(
+        gfx::CreateVectorIcon(iconId, kMDButtonIconSize.width, pressedColor));
+    disabledIcon = NSImageFromImageSkia(
+        gfx::CreateVectorIcon(iconId, kMDButtonIconSize.width, disabledColor));
+  }
+
+  ImageButtonCell* theCell = base::mac::ObjCCast<ImageButtonCell>([self cell]);
+  // Set the image for the default state, which is just the icon.
+  [theCell setImage:defaultIcon
+     forButtonState:image_button_cell::kDefaultState];
+
+  // Determine the appropriate image background style for the hover and pressed
+  // states.
+  ToolbarButtonImageBackgroundStyle hoverStyle;
+  ToolbarButtonImageBackgroundStyle pressedStyle;
+  const ui::ThemeProvider* themeProvider = [[self window] themeProvider];
+  bool isNonIncognitoSystemTheme = themeProvider &&
+      !themeProvider->InIncognitoMode() && themeProvider->UsingSystemTheme();
+  // Use the regular style only when using the system (i.e. non-custom) theme
+  // and not in Incognito mode.
+  if (isNonIncognitoSystemTheme) {
+    hoverStyle = ToolbarButtonImageBackgroundStyle::HOVER;
+    pressedStyle = ToolbarButtonImageBackgroundStyle::PRESSED;
+  } else {
+    hoverStyle = ToolbarButtonImageBackgroundStyle::HOVER_THEMED;
+    pressedStyle = ToolbarButtonImageBackgroundStyle::PRESSED_THEMED;
+  }
+
+  // Create and set the image for the hover state.
+  NSImage* hoverImage =
+      [self imageForIcon:defaultIcon withBackgroundStyle:hoverStyle];
+  [theCell setImage:hoverImage
+     forButtonState:image_button_cell::kHoverState];
+
+  // Create and set the image for the pressed state.
+  NSImage* pressedImage =
+      [self imageForIcon:pressedIcon withBackgroundStyle:pressedStyle];
+  [theCell setImage:pressedImage
+     forButtonState:image_button_cell::kPressedState];
+
+  // Set the image for the disabled state, which is just the disabled icon,
+  // except if this is the home button.
+  if (iconId == gfx::VectorIconId::NAVIGATE_RELOAD) {
+    [theCell setImage:nil forButtonState:image_button_cell::kDisabledState];
+  } else {
+    [theCell setImage:disabledIcon
+       forButtonState:image_button_cell::kDisabledState];
+  }
+  [self setNeedsDisplay:YES];
+}
+
+- (void)resetIcons {
+  // Compute the button's icon.
+  gfx::VectorIconId icon_id = gfx::VectorIconId::VECTOR_ICON_NONE;
+  switch ([self viewID]) {
+    case VIEW_ID_BACK_BUTTON:
+      icon_id = gfx::VectorIconId::NAVIGATE_BACK;
+      break;
+    case VIEW_ID_FORWARD_BUTTON:
+      icon_id = gfx::VectorIconId::NAVIGATE_FORWARD;
+      break;
+    case VIEW_ID_HOME_BUTTON:
+      icon_id = gfx::VectorIconId::NAVIGATE_HOME;
+      break;
+    case VIEW_ID_APP_MENU:
+      icon_id = gfx::VectorIconId::BROWSER_TOOLS;
+      break;
+    default:
+      break;
+  }
+
+  // Set it.
+  if (icon_id != gfx::VectorIconId::VECTOR_ICON_NONE) {
+    [self setImagesFromIconId:icon_id];
+  }
+}
+
+- (void)viewDidMoveToWindow {
+  // In Material Design we want to catch when the button is attached to its
+  // window so that we can configure its appearance based on the window's
+  // theme.
+  if ([self window] && ui::MaterialDesignController::IsModeMaterial()) {
+    [self resetIcons];
+  }
+}
+
+// ThemedWindowDrawing implementation.
+
+- (void)windowDidChangeTheme {
+  [self resetIcons];
+}
+
+- (void)windowDidChangeActive {
+}
+
 @end