[Mac][Material Design] Adjust incognito hover glow.

chrome/browser/ui/cocoa/tabs/tab_view.mm

 // Copyright (c) 2012 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.
 
 #import "chrome/browser/ui/cocoa/tabs/tab_view.h"
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "base/mac/sdk_forward_declarations.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 29 matching lines @@
 const NSTimeInterval kHoverHoldDuration = 0.02;
 const NSTimeInterval kHoverHideDuration = 0.4;
 const NSTimeInterval kAlertShowDuration = 0.4;
 const NSTimeInterval kAlertHoldDuration = 0.4;
 const NSTimeInterval kAlertHideDuration = 0.4;
 
 // The default time interval in seconds between glow updates (when
 // increasing/decreasing).
 const NSTimeInterval kGlowUpdateInterval = 0.025;
 
+// The intensity of the white overlay when hovering the mouse over a tab.
+const CGFloat kMouseHoverWhiteValue = 1.0;
+const CGFloat kMouseHoverWhiteValueIncongito = 0.3;
+
 // This is used to judge whether the mouse has moved during rapid closure; if it
 // has moved less than the threshold, we want to close the tab.
 const CGFloat kRapidCloseDist = 2.5;
 
 @interface NSView (PrivateAPI)
 // Called by AppKit to check if dragging this view should move the window.
 // NSButton overrides this method in the same way so dragging window buttons
 // has no effect. NSView implementation returns NSZeroRect so the whole view
 // area can be dragged.
 - (NSRect)_opaqueRectForWindowMoveWhenInTitlebar;
@@ skipping 412 matching lines @@
     // image. However, even if the theme doesn't provide a tab background, the
     // theme machinery will make one if given a frame image. See
     // BrowserThemePack::GenerateTabBackgroundImages for details.
     const ui::ThemeProvider* themeProvider = [[self window] themeProvider];
     BOOL hasCustomTheme = themeProvider &&
         (themeProvider->HasCustomImage(IDR_THEME_TAB_BACKGROUND) ||
          themeProvider->HasCustomImage(IDR_THEME_FRAME));
     // Draw a mouse hover gradient for the default themes.
     if (hoverAlpha > 0) {
       if (themeProvider && !hasCustomTheme) {
-        CGFloat whiteValue = 1;
-        // In Incognito mode, give the glow a darker value.
+        CGFloat whiteValue = kMouseHoverWhiteValue;
         if (themeProvider && themeProvider->InIncognitoMode()) {
-          whiteValue = 0.5;
+          whiteValue = kMouseHoverWhiteValueIncongito;
         }
         base::scoped_nsobject<NSGradient> glow([NSGradient alloc]);
         [glow initWithStartingColor:[NSColor colorWithCalibratedWhite:whiteValue
                                         alpha:1.0 * hoverAlpha]
                         endingColor:[NSColor colorWithCalibratedWhite:whiteValue
                                                                 alpha:0.0]];
         NSRect rect = [self bounds];
         NSPoint point = hoverPoint_;
         point.y = NSHeight(rect);
         [glow drawFromCenter:point
@@ skipping 521 matching lines @@
 
 // For "Increase Contrast" mode, use flat black instead of semitransparent black
 // for the tab edge stroke.
 + (void)setTabEdgeStrokeColor {
   static NSColor* heavyStrokeColor =
       [skia::SkColorToSRGBNSColor(SK_ColorBLACK) retain];
   [heavyStrokeColor set];
 }
 
 @end