Restrict new tab button clicks to inside the image bounds, not anywhere in th...

chrome/browser/cocoa/new_tab_button.mm

+// Copyright (c) 2010 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/cocoa/new_tab_button.h"
+
+@implementation NewTabButton
+
+// Approximate the shape. It doesn't need to be perfect. This will need to be
+// updated if the size or shape of the icon ever changes.
+// TODO(pinkerton): use a click mask image instead of hard-coding points.
+- (NSBezierPath*)pathForButton {
+  if (imagePath_.get())
+    return imagePath_.get();
+
+  // Cache the path as it doesn't change (the coordinates are local to this
+  // view). There's not much point making constants for these, as they are
+  // custom.
+  imagePath_.reset([[NSBezierPath bezierPath] retain]);
+  [imagePath_ moveToPoint:NSMakePoint(9, 7)];
+  [imagePath_ lineToPoint:NSMakePoint(26, 7)];
+  [imagePath_ lineToPoint:NSMakePoint(33, 23)];
+  [imagePath_ lineToPoint:NSMakePoint(14, 23)];
+  [imagePath_ lineToPoint:NSMakePoint(9, 7)];
+  return imagePath_;
+}
+
+// Override to only accept clicks within the bounds of the defined path, not
+// the entire bounding box. |aPoint| is in the superview's coordinate system.
+- (NSView*)hitTest:(NSPoint)aPoint {
+  NSBezierPath* buttonPath = [self pathForButton];
+  NSPoint localPoint = [self convertPoint:aPoint fromView:[self superview]];
+  if ([buttonPath containsPoint:localPoint])
+    return [super hitTest:aPoint];
+  return nil;
+}
+
+@end