ui/base/cocoa/focus_tracker.h

   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 <Cocoa/Cocoa.h>
   6
   7 #include "base/memory/scoped_nsobject.h"
   8 #include "ui/base/ui_export.h"
   9
  10 // A class that handles saving and restoring focus.  An instance of
  11 // this class snapshots the currently focused view when it is
  12 // constructed, and callers can use restoreFocus to return focus to
  13 // that view.  FocusTracker will not restore focus to views that are
  14 // no longer in the view hierarchy or are not in the correct window.
  15 UI_EXPORT
  16 @interface FocusTracker : NSObject {
  17  @private
  18   scoped_nsobject<NSView> focusedView_;
  19 }
  20
  21 // |window| is the window that we are saving focus for.  This
  22 // method snapshots the currently focused view.
  23 - (id)initWithWindow:(NSWindow*)window;
  24
  25 // Attempts to restore focus to the snapshotted view.  Returns YES if
  26 // focus was restored.  Will not restore focus if the view is no
  27 // longer in the view hierarchy under |window|.
  28 - (BOOL)restoreFocusInWindow:(NSWindow*)window;
  29 @end