Implemented fullscreen exit animation with AppKit

chrome/browser/ui/cocoa/full_size_content_window.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_FULL_SIZE_CONTENT_WINDOW_H_
 #define CHROME_BROWSER_UI_COCOA_FULL_SIZE_CONTENT_WINDOW_H_
 
 #import "chrome/browser/ui/cocoa/chrome_event_processing_window.h"
 
 #include "base/mac/scoped_nsobject.h"
 
 // By default, the contentView does not occupy the full size of a framed
 // window. Chrome still wants to draw in the title bar. Historically, Chrome
 // has done this by adding subviews directly to the root view. This causes
 // several problems. The most egregious is related to layer ordering when the
 // root view does not have a layer. By giving the contentView the same size as
 // the window, there is no longer any need to add subviews to the root view.
 //
 // If the window does not have a titlebar, then its contentView already has the
 // same size as the window. In this case, this class has no effect.
 //
 // This class currently does not support changing the window's style after the
 // window has been initialized.
+
+// This view always takes the size of its superview. It is intended to be used
+// as a NSWindow's contentView.  It is needed because NSWindow's implementation
+// explicitly resizes the contentView at inopportune times.
+@interface FullSizeContentView : NSView
+
+// This method is directly called by AppKit during a live window resize.
+// Override it to prevent the content view from shrinking.
+- (void)setFrameSize:(NSSize)size;
+
+// This method allows us to set the content view size since setFrameSize is
+// overridden to prevent the view from shrinking
+- (void)forceFrameSize:(NSSize)size;

[erikchen, 2015/08/12 22:08:53]

(I should have made this comment in my first review pass, apologies)

This class is an implementation detail of FullSizeContentWindow. Instead of
exposing this, can you add a method to FullSizeContentWindow that can force a
change in the size of the content view?
e.g.
-[FullSizeContentWindow forceContentViewSize:]

[spqchan1, 2015/08/13 20:38:48]

Done.

[spqchan1, 2015/08/13 20:38:48]

Done.

+
+@end
+
 @interface FullSizeContentWindow : ChromeEventProcessingWindow {
  @private
   // Holds the view that replaces [window contentView]. This view has the same
   // size as the window.  Empty if there is no titlebar.
   base::scoped_nsobject<NSView> chromeWindowView_;
 }
 
 // Designated initializer.
 - (instancetype)initWithContentRect:(NSRect)contentRect
                           styleMask:(NSUInteger)windowStyle
                             backing:(NSBackingStoreType)bufferingType
                               defer:(BOOL)deferCreation
              wantsViewsOverTitlebar:(BOOL)wantsViewsOverTitlebar;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_FULL_SIZE_CONTENT_WINDOW_H_