Implemented fullscreen exit animation with AppKit

chrome/browser/ui/cocoa/browser_window_fullscreen_transition.h

 // Copyright 2015 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_BROWSER_WINDOW_FULLSCREEN_TRANSITION_H_
 #define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_FULLSCREEN_TRANSITION_H_
 
 #import <Cocoa/Cocoa.h>
 
 // This class is responsible for managing the custom transition of a
-// BrowserWindow from its normal state into an AppKit Fullscreen state.
+// BrowserWindow from its normal state into an AppKit Fullscreen state
+// and vice versa.
 //
 // By default, when AppKit Fullscreens a window, it creates a new virtual
 // desktop and slides it in from the right of the screen. At the same time, the
 // old virtual desktop slides off to the left. This animation takes one second,
 // and the time is not customizable without elevated privileges or a
 // self-modifying binary
 // (https://code.google.com/p/chromium/issues/detail?id=414527). During that
 // second, no user interaction is possible.
 //
 // The default implementation of the AppKit transition smoothly animates a
 // window from its original size to the full size of the screen. At the
 // beginning of the animation, it takes a snapshot of the window's current
 // state. Then it resizes the window, calls drawRect: (theorized, not tested),
 // and takes a snapshot of the window's final state. The animation is a simple
 // crossfade between the two snapshots. This has a flaw. Frequently, the
 // renderer has not yet drawn content for the resized window by the time
 // drawRect: is called. As a result, the animation is effectively a no-op. When
 // the animation is finished, the new web content flashes in.
 //
-// The window's delegate can override two methods to customize the transition.
+// The window's delegate can override four methods to customize the transition.
 //  -customWindowsToEnterFullScreenForWindow:
 //    The return of this method is an array of NSWindows. Each window that is
 //    returned will be added to the new virtual desktop after the animation is
 //    finished, but will not be a part of the animation itself.
 //  -window:startCustomAnimationToEnterFullScreenWithDuration:
 //    In this method, the window's delegate adds animations to the windows
 //    returned in the above method.
+//  -customWindowsToExitFullScreenForWindow:
+//    This method is similar to customWindowsToEnterFullScreenForWindow,
+//    but is used for the animation is exiting full screen
+//  -window:startCustomAnimationToExitFullScreenWithDuration:
+//    In this method, the window's delegate adds animations to the windows
+//    returned in the above method.
 //
 // The goal of this class is to mimic the default animation, but instead of
 // taking a snapshot of the final web content, it uses the live web content
 // during the animation.
 //
 // See https://code.google.com/p/chromium/issues/detail?id=414527#c22 and its
 // preceding comments for a more detailed description of the implementation,
 // and the reasoning behind the decisions made.
 //
 // Recommended usage:
@@ skipping 16 matching lines @@
 //    self.transition = nil;
 //  }
 //
 //  (Override method on NSWindow)
 //  - (NSRect)constrainFrameRect:(NSRect)frame toScreen:(NSScreen*)screen {
 //    if (self.transition && ![self.transition shouldWindowBeConstrained])
 //      return frame;
 //    return [super constrainFrameRect:frame toScreen:screen];
 //  }
 
-@interface BrowserWindowEnterFullscreenTransition : NSObject
+
+@interface BrowserWindowFullscreenTransition : NSObject
 
 // Designated initializer. |window| is the NSWindow that is going to be moved
 // into a fullscreen Space (virtual desktop), and resized to have the same size
 // as the screen. |window|'s root view must be layer backed.
 - (instancetype)initWithWindow:(NSWindow*)window;
 
-// Returns the windows to be used in the custom transition.
-//   - Takes a snapshot of the current window.
-//   - Makes a new snapshot window which shows the snapshot in the same
-//   location as the current window.
-//   - Adds the style mask NSFullScreenWindowMask to the current window.
-//   - Makes the current window transparent, and resizes the current window to
-//   be the same size as the screen.
-- (NSArray*)customWindowsToEnterFullScreen;
+// Returns the windows to be used in the custom exit transition.
+- (NSArray*)customWindowsToExitFullScreenTransition;
 
-// Begins the animations used for the custom fullscreen transition.
+
+// Returns the windows to be used in the custom enter transition.
+- (NSArray*)customWindowsToEnterFullScreenTransition;
+
+// Begins the animations used for the custom exit fullscreen transition.

[erikchen, 2015/08/10 18:06:25]

This comment doesn't apply to the exit fullscreen transition, but you added the
word "exit" anyways. You'll want to do some comment fixing.

[spqchan1, 2015/08/11 21:43:47]

Done.

 //   - Animates the snapshot to the full size of the screen while fading it out.
 //   - Animates the current window from it's original location to its final
 //   location, while fading it in.
 // Note: The two animations are added to different layers in different windows.
 // There is no explicit logic to keep the two animations in sync. If this
 // proves to be a problem, the relevant layers should attempt to sync up their
 // time offsets with CACurrentMediaTime().
-- (void)startCustomAnimationToEnterFullScreenWithDuration:
+- (void)startCustomExitFullScreenAnimationWithDuration:
     (NSTimeInterval)duration;
 
+- (void)startCustomEnterFullScreenAnimationWithDuration:
+    (NSTimeInterval)duration;
+
+
 // When this method returns true, the NSWindow method
 // -constrainFrameRect:toScreen: must return the frame rect without
 // constraining it. The owner of the instance of this class is responsible for
 // hooking up this logic.
 - (BOOL)shouldWindowBeUnconstrained;
 
+

[erikchen, 2015/08/10 18:06:25]

whitespace

[spqchan1, 2015/08/11 21:43:47]

Done.

 @end
 
+

[erikchen, 2015/08/10 18:06:25]

whitespace

[spqchan1, 2015/08/11 21:43:47]

Done.

 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_FULLSCREEN_TRANSITION_H_