MacViews: Implement SetCursor

ui/views/cocoa/native_widget_mac_nswindow.mm

 // Copyright 2014 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 "ui/views/cocoa/native_widget_mac_nswindow.h"
 
 #include "base/mac/foundation_util.h"
 #import "ui/views/cocoa/views_nswindow_delegate.h"
 #include "ui/views/widget/native_widget_mac.h"
 
@@ skipping 41 matching lines @@
 // is needed in addition to the -[NSWindow display] override because Cocoa
 // hardly ever calls display, and reports -[NSWindow isVisible] incorrectly
 // when ordering in a window for the first time.
 - (void)orderWindow:(NSWindowOrderingMode)orderingMode
          relativeTo:(NSInteger)otherWindowNumber {
   [[self viewsNSWindowDelegate] onWindowOrderWillChange:orderingMode];
   [super orderWindow:orderingMode relativeTo:otherWindowNumber];
   [[self viewsNSWindowDelegate] onWindowOrderChanged:nil];
 }
 
+// NSResponder implementation.
+
+- (void)cursorUpdate:(NSEvent*)theEvent {
+  // The cursor provided by the delegate should only be applied within the
+  // content area. This is because we rely on the contentView to track the
+  // mouse cursor and forward cursorUpdate: messages up the responder chain.
+  // The cursorUpdate: isn't handled in BridgedContentView because views-style
+  // SetCapture() conflicts with the way tracking events are processed for
+  // the view during a drag. Since the NSWindow is still in the responder chain
+  // overriding cursorUpdate: here handles both cases.
+  if (!NSPointInRect([theEvent locationInWindow], [[self contentView] frame])) {
+    [super cursorUpdate:theEvent];
+    return;
+  }
+
+  NSCursor* cursor = [[self viewsNSWindowDelegate] cursor];
+  if (cursor)
+    [cursor set];
+  else
+    [super cursorUpdate:theEvent];
+}
+
 @end