Implemented fullscreen exit animation with AppKit

chrome/browser/ui/cocoa/browser_window_fullscreen_transition.mm

Index: chrome/browser/ui/cocoa/browser_window_fullscreen_transition.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_enter_fullscreen_transition.mm b/chrome/browser/ui/cocoa/browser_window_fullscreen_transition.mm
similarity index 62%
rename from chrome/browser/ui/cocoa/browser_window_enter_fullscreen_transition.mm
rename to chrome/browser/ui/cocoa/browser_window_fullscreen_transition.mm
index 7eca5ec2087b2c953a1e2a21254a7a57f1700c26..eebd7b70d6e637e5c01309a3a2055d1b69dba645 100644
--- a/chrome/browser/ui/cocoa/browser_window_enter_fullscreen_transition.mm
+++ b/chrome/browser/ui/cocoa/browser_window_fullscreen_transition.mm
@@ -2,32 +2,39 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#import "chrome/browser/ui/cocoa/browser_window_enter_fullscreen_transition.h"
+#import "chrome/browser/ui/cocoa/browser_window_fullscreen_transition.h"
 
 #include <QuartzCore/QuartzCore.h>
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/mac/sdk_forward_declarations.h"
+#import "chrome/browser/ui/cocoa/framed_browser_window.h"
+#import "chrome/browser/ui/cocoa/full_size_content_window.h"
 
 namespace {
 
-NSString* const kPrimaryWindowAnimationID = @"PrimaryWindowAnimationID";
-NSString* const kSnapshotWindowAnimationID = @"SnapshotWindowAnimationID";
-NSString* const kAnimationIDKey = @"AnimationIDKey";
+  NSString* const kPrimaryWindowAnimationID = @"PrimaryWindowAnimationID";
+  NSString* const kSnapshotWindowAnimationID = @"SnapshotWindowAnimationID";
+  NSString* const kAnimationIDKey = @"AnimationIDKey";
 
-// This class has two simultaneous animations to resize and reposition layers.
-// These animations must use the same timing function, otherwise there will be
-// visual discordance.
-NSString* TransformAnimationTimingFunction() {
-  return kCAMediaTimingFunctionEaseInEaseOut;
-}
+  // This class has two simultaneous animations to resize and reposition layers.
+  // These animations must use the same timing function, otherwise there will be
+  // visual discordance.
+  NSString* TransformAnimationTimingFunction() {
+    return kCAMediaTimingFunctionEaseInEaseOut;
+  }
 
 }  // namespace
 
-@interface BrowserWindowEnterFullscreenTransition () {
+
+@interface BrowserWindowFullscreenTransition () {
+
+  // Flag to keep track of whether we are entering or exiting full screen
+  BOOL isEnteringFullscreen;
+
   // The window which is undergoing the fullscreen transition.
-  base::scoped_nsobject<NSWindow> primaryWindow_;
+  base::scoped_nsobject<FramedBrowserWindow> primaryWindow_;
 
   // A layer that holds a snapshot of the original state of |primaryWindow_|.
   base::scoped_nsobject<CALayer> snapshotLayer_;
@@ -35,9 +42,6 @@ NSString* TransformAnimationTimingFunction() {
   // A temporary window that holds |snapshotLayer_|.
   base::scoped_nsobject<NSWindow> snapshotWindow_;
 
-  // The frame of the |primaryWindow_| before the transition began.
-  NSRect primaryWindowInitialFrame_;
-
   // The background color of |primaryWindow_| before the transition began.
   base::scoped_nsobject<NSColor> primaryWindowInitialBackgroundColor_;
 
@@ -48,9 +52,16 @@ NSString* TransformAnimationTimingFunction() {
   // |primaryWindow_|.
   BOOL changingPrimaryWindowSize_;
 
+  // The frame of the |primaryWindow_| before it starts the transition.
+  NSRect initialFrame_;
+
+  // The frame of the |primaryWindow_| before it starts the transition
+  // relative the the coordinates of its current screen
+  NSRect initialFrameRelativeToScreen_;
+
   // The frame that |primaryWindow_| is expected to have after the transition
   // is finished.
-  NSRect primaryWindowFinalFrame_;
+  NSRect finalFrame_;
 }
 
 // Takes a snapshot of |primaryWindow_| and puts it in |snapshotLayer_|.
@@ -62,29 +73,34 @@ NSString* TransformAnimationTimingFunction() {
 // This method has several effects on |primaryWindow_|:
 //  - Saves current state.
 //  - Makes window transparent, with clear background.
-//  - Adds NSFullScreenWindowMask style mask.
-//  - Sets the size to the screen's size.
+//  - If we are entering full screen, it will also:
+//    - Adds NSFullScreenWindowMask style mask.
+//    - Sets the size to the screen's size.
 - (void)preparePrimaryWindowForAnimation;
 
+// 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*)customWindowsForFullScreenTransition;
+
 // Applies the fullscreen animation to |snapshotLayer_|.
 - (void)animateSnapshotWindowWithDuration:(CGFloat)duration;
 
-// Applies the fullscreen animation to the root layer of |primaryWindow_|.
-- (void)animatePrimaryWindowWithDuration:(CGFloat)duration;
+- (void)setPrimaryWindowToFinalFrame;
 
-// Override of CAAnimation delegate method.
-- (void)animationDidStop:(CAAnimation*)theAnimation finished:(BOOL)flag;
-
-// Returns the layer of the root view of |window|.
 - (CALayer*)rootLayerOfWindow:(NSWindow*)window;
 
 @end
 
-@implementation BrowserWindowEnterFullscreenTransition
+@implementation BrowserWindowFullscreenTransition
 
 // -------------------------Public Methods----------------------------
 
-- (instancetype)initWithWindow:(NSWindow*)window {
+- (instancetype)initWithWindow:(FramedBrowserWindow*)window {
   DCHECK(window);
   DCHECK([self rootLayerOfWindow:window]);
   if ((self = [super init])) {
@@ -93,17 +109,48 @@ NSString* TransformAnimationTimingFunction() {
   return self;
 }
 
-- (NSArray*)customWindowsToEnterFullScreen {
-  [self takeSnapshot];
-  [self makeAndPrepareSnapshotWindow];
-  [self preparePrimaryWindowForAnimation];
-  return @[ primaryWindow_.get(), snapshotWindow_.get() ];
+- (NSArray*)customWindowsToEnterFullScreenTransition {
+    isEnteringFullscreen = YES;
+    initialFrame_ = [primaryWindow_ frame];
+    finalFrame_ = [[primaryWindow_ screen] frame];
+
+    return [self customWindowsForFullScreenTransition];
 }
 
-- (void)startCustomAnimationToEnterFullScreenWithDuration:
+- (NSArray*)customWindowsToExitFullScreenTransition {
+    isEnteringFullscreen = NO;
+    finalFrame_ = initialFrame_;
+    initialFrame_ = [[primaryWindow_ screen] frame];
+
+    // Calculate the inital frame that is relative to coordinates of the
+    // screen which it's on
+    initialFrameRelativeToScreen_ = finalFrame_;
+    CGFloat screenOriginX = finalFrame_.origin.x - initialFrame_.origin.x;
+    CGFloat screenOriginY = finalFrame_.origin.y - initialFrame_.origin.y;
+    initialFrameRelativeToScreen_.origin =
+        CGPointMake(screenOriginX, screenOriginY);
+
+    return [self customWindowsForFullScreenTransition];
+}
+
+// Right before the animation begins, change the content view size
+// and lock the primary window so that OSX can't make changes to it
+// before we finish the animation
+- (void)startCustomExitFullScreenAnimationWithDuration:
     (NSTimeInterval)duration {
+  FullSizeContentView* content =
+      (FullSizeContentView*)[primaryWindow_ contentView];
+  [content forceFrameSize:finalFrame_.size];
+  [primaryWindow_ setFrameAndStyleLock:YES];
+
+  [self animatePrimaryWindowWithDuration:duration];
   [self animateSnapshotWindowWithDuration:duration];
+}
+
+- (void)startCustomEnterFullScreenAnimationWithDuration:
+    (NSTimeInterval)duration {
   [self animatePrimaryWindowWithDuration:duration];
+  [self animateSnapshotWindowWithDuration:duration];
 }
 
 - (BOOL)shouldWindowBeUnconstrained {
@@ -148,47 +195,27 @@ NSString* TransformAnimationTimingFunction() {
   [snapshotLayer_ setFrame:snapshotLayerFrame];
 }
 
-- (void)preparePrimaryWindowForAnimation {
-  // Save initial state of |primaryWindow_|.
-  primaryWindowInitialFrame_ = [primaryWindow_ frame];
-  primaryWindowInitialBackgroundColor_.reset(
-      [[primaryWindow_ backgroundColor] copy]);
-  primaryWindowInitialOpaque_ = [primaryWindow_ isOpaque];
-
-  primaryWindowFinalFrame_ = [[primaryWindow_ screen] frame];
-
-  // Make |primaryWindow_| invisible. This must happen before the window is
-  // resized, since resizing the window will call drawRect: and cause content
-  // to flash over the entire screen.
-  [primaryWindow_ setOpaque:NO];
-  [primaryWindow_ setBackgroundColor:[NSColor clearColor]];
-  CALayer* rootLayer = [self rootLayerOfWindow:primaryWindow_];
-  rootLayer.opacity = 0;
-
-  // As soon as the style mask includes the flag NSFullScreenWindowMask, the
-  // window is expected to receive fullscreen layout. This must be set before
-  // the window is resized, as that causes a relayout.
-  [primaryWindow_
-      setStyleMask:[primaryWindow_ styleMask] | NSFullScreenWindowMask];
-
-  // Resize |primaryWindow_|.
-  changingPrimaryWindowSize_ = YES;
-  [primaryWindow_ setFrame:primaryWindowFinalFrame_ display:YES];
-  changingPrimaryWindowSize_ = NO;
+- (NSArray*)customWindowsForFullScreenTransition {
+  [self takeSnapshot];
+  [self makeAndPrepareSnapshotWindow];
+  [self preparePrimaryWindowForAnimation];
+  return @[ primaryWindow_.get(), snapshotWindow_.get() ];
 }
 
 - (void)animateSnapshotWindowWithDuration:(CGFloat)duration {
-  // Move the snapshot layer until it's bottom-left corner is at the
-  // bottom-left corner of the screen.
+  [snapshotWindow_ orderFront:nil];
+  NSRect finalScreenFrame = [snapshotWindow_ convertRectFromScreen:finalFrame_];
+
   CABasicAnimation* positionAnimation =
       [CABasicAnimation animationWithKeyPath:@"position"];
-  positionAnimation.toValue = [NSValue valueWithPoint:NSZeroPoint];
+  positionAnimation.toValue = [NSValue valueWithPoint:finalScreenFrame.origin];
   positionAnimation.timingFunction = [CAMediaTimingFunction
       functionWithName:TransformAnimationTimingFunction()];
 
-  // Expand the bounds until it covers the screen.
-  NSRect finalBounds = NSMakeRect(0, 0, NSWidth(primaryWindowFinalFrame_),
-                                  NSHeight(primaryWindowFinalFrame_));
+  // Resize the bounds until it reaches the expected size at the end of the
+  // animation.
+  NSRect finalBounds = NSMakeRect(0, 0, NSWidth(finalFrame_),
+                                  NSHeight(finalFrame_));
   CABasicAnimation* boundsAnimation =
       [CABasicAnimation animationWithKeyPath:@"bounds"];
   boundsAnimation.toValue = [NSValue valueWithRect:finalBounds];
@@ -216,6 +243,7 @@ NSString* TransformAnimationTimingFunction() {
 }
 
 - (void)animatePrimaryWindowWithDuration:(CGFloat)duration {
+
   // As soon as the window's root layer is scaled down, the opacity should be
   // set back to 1. There are a couple of ways to do this. The easiest is to
   // just have a dummy animation as part of the same animation group.
@@ -223,12 +251,13 @@ NSString* TransformAnimationTimingFunction() {
       [CABasicAnimation animationWithKeyPath:@"opacity"];
   opacityAnimation.fromValue = @(1.0);
   opacityAnimation.toValue = @(1.0);
+  opacityAnimation.duration = duration;
 
   // The root layer's size should start scaled down to the initial size of
   // |primaryWindow_|. The animation increases the size until the root layer
   // fills the screen.
-  NSRect initialFrame = primaryWindowInitialFrame_;
-  NSRect endFrame = primaryWindowFinalFrame_;
+  NSRect initialFrame = initialFrame_;
+  NSRect endFrame = finalFrame_;
   CGFloat xScale = NSWidth(initialFrame) / NSWidth(endFrame);
   CGFloat yScale = NSHeight(initialFrame) / NSHeight(endFrame);
   CATransform3D initial = CATransform3DMakeScale(xScale, yScale, 1);
@@ -236,10 +265,9 @@ NSString* TransformAnimationTimingFunction() {
       [CABasicAnimation animationWithKeyPath:@"transform"];
   transformAnimation.fromValue = [NSValue valueWithCATransform3D:initial];
 
-  CALayer* root = [self rootLayerOfWindow:primaryWindow_];
-
   // Calculate the initial position of the root layer. This calculation is
-  // agnostic of the anchorPoint.
+  // agnostic of the anchorPoint. 
+  CALayer* root = [self rootLayerOfWindow:primaryWindow_];
   CGFloat layerStartPositionDeltaX = NSMidX(initialFrame) - NSMidX(endFrame);
   CGFloat layerStartPositionDeltaY = NSMidY(initialFrame) - NSMidY(endFrame);
   NSPoint layerStartPosition =
@@ -255,7 +283,7 @@ NSString* TransformAnimationTimingFunction() {
   group.removedOnCompletion = NO;
   group.fillMode = kCAFillModeForwards;
   group.animations =
-      @[ transformAnimation, opacityAnimation, positionAnimation ];
+      @[ opacityAnimation, positionAnimation, transformAnimation];
   group.timingFunction = [CAMediaTimingFunction
       functionWithName:TransformAnimationTimingFunction()];
   group.duration = duration;
@@ -265,8 +293,37 @@ NSString* TransformAnimationTimingFunction() {
   [root addAnimation:group forKey:kPrimaryWindowAnimationID];
 }
 
+- (void)preparePrimaryWindowForAnimation {
+  // Save the initial state of the primary window
+  primaryWindowInitialBackgroundColor_.reset(
+      [[primaryWindow_ backgroundColor] copy]);
+  primaryWindowInitialOpaque_ = [primaryWindow_ isOpaque];
+
+  [primaryWindow_ setOpaque:NO];
+
+  CALayer* root = [self rootLayerOfWindow:primaryWindow_];
+  root.opacity = 0;
+  root.frame = initialFrameRelativeToScreen_;
+
+  if (isEnteringFullscreen) {
+    [primaryWindow_
+        setStyleMask:[primaryWindow_ styleMask] | NSFullScreenWindowMask];
+    [self setPrimaryWindowToFinalFrame];
+  }
+
+}
+
+- (void)setPrimaryWindowToFinalFrame {
+  changingPrimaryWindowSize_ = YES;
+  [primaryWindow_ setFrame:finalFrame_ display:NO];
+  changingPrimaryWindowSize_ = NO;
+}
+
+
 - (void)animationDidStop:(CAAnimation*)theAnimation finished:(BOOL)flag {
   NSString* animationID = [theAnimation valueForKey:kAnimationIDKey];
+
+  // Remove the snapshot window
   if ([animationID isEqual:kSnapshotWindowAnimationID]) {
     [snapshotWindow_ orderOut:nil];
     snapshotWindow_.reset();
@@ -275,11 +332,24 @@ NSString* TransformAnimationTimingFunction() {
   }
 
   if ([animationID isEqual:kPrimaryWindowAnimationID]) {
-    [primaryWindow_ setOpaque:YES];
+    // If we're exiting full screen, we want to set the primary window
+    // size to the expected frame at the end
+    // We will also need to unlock the frame
+    if (!isEnteringFullscreen) {
+      [primaryWindow_ setFrameAndStyleLock:NO];
+      [primaryWindow_
+          setStyleMask:[primaryWindow_ styleMask] & ~NSFullScreenWindowMask];
+      [self setPrimaryWindowToFinalFrame];
+    }
+
+    // Restore the state of the primary window and make it visible again
+    [primaryWindow_ setOpaque:primaryWindowInitialOpaque_];
     [primaryWindow_ setBackgroundColor:primaryWindowInitialBackgroundColor_];
+
     CALayer* root = [self rootLayerOfWindow:primaryWindow_];
-    root.opacity = 1;
     [root removeAnimationForKey:kPrimaryWindowAnimationID];
+    root.opacity = 1;
+
   }
 }