ui/base/cocoa/nib_loading.mm

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #import "ui/base/cocoa/nib_loading.h"
   6
   7 #include "base/mac/bundle_locations.h"
   8 #include "base/mac/scoped_nsobject.h"
   9
  10 namespace ui {
  11
  12 NSView* GetViewFromNib(NSString* name) {
  13   base::scoped_nsobject<NSNib> nib(
  14       [[NSNib alloc] initWithNibNamed:name
  15                                bundle:base::mac::FrameworkBundle()]);
  16   if (!nib)
  17     return nil;
  18
  19   NSArray* objects;
  20   BOOL success = [nib instantiateNibWithOwner:nil
  21                               topLevelObjects:&objects];
  22   if (!success)
  23     return nil;
  24
  25   // When loading a nib manually (as opposed to using an NSWindowController or
  26   // NSViewController), all the top-level objects need to be explicitly
  27   // released. See
  28   // http://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/LoadingResources/CocoaNibs/CocoaNibs.html#//apple_ref/doc/uid/10000051i-CH4-SW10
  29   // for more information.
  30   [objects makeObjectsPerformSelector:@selector(release)];
  31
  32   // For some strange reason, even nibs that appear to have but one top-level
  33   // object often have more (an NSApplication, etc.). Filter out what isn't
  34   // desired.
  35   for (NSView* view in objects) {
  36     if (![view isKindOfClass:[NSView class]])
  37       continue;
  38
  39     return [[view retain] autorelease];
  40   }
  41
  42   return nil;
  43 }
  44
  45 }  // namespace ui