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chrome/browser/ui/cocoa/fast_resize_view.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_FAST_RESIZE_VIEW_H_
 #define CHROME_BROWSER_UI_COCOA_FAST_RESIZE_VIEW_H_
 
 #import <Cocoa/Cocoa.h>
 
 // A Cocoa view that supports an alternate resizing mode, normally used when
 // animations are in progress.  In normal resizing mode, subviews are sized to
 // completely fill this view's bounds.  In fast resizing mode, the subviews'
 // size is not changed and the subview is clipped to fit, if necessary.  Fast
 // resize mode is useful when animating a view that normally takes a significant
 // amount of time to relayout and redraw when its size is changed.
 @interface FastResizeView : NSView {
  @private
   BOOL fastResizeMode_;
+
+  // Offset from the top of the view where the view's content starts. This is
+  // used to prevent this view from drawing white on non-content area.
+  CGFloat contentOffset_;
 }
 
+@property(assign, nonatomic) CGFloat contentOffset;
+
 // Turns fast resizing mode on or off, which determines how this view resizes
 // its subviews.  Turning fast resizing mode off has the effect of immediately
 // resizing subviews to fit; callers do not need to explictly call |setFrame:|
 // to trigger a resize.
 - (void)setFastResizeMode:(BOOL)fastResizeMode;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_FAST_RESIZE_VIEW_H_