Implemented fullscreen exit animation with AppKit

chrome/browser/ui/cocoa/framed_browser_window.mm

 // Copyright (c) 2012 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.
 
 #import "chrome/browser/ui/cocoa/framed_browser_window.h"
 
 #include "base/logging.h"
 #include "base/mac/sdk_forward_declarations.h"
+#include "base/metrics/histogram.h"
 #include "chrome/browser/global_keyboard_shortcuts_mac.h"
 #include "chrome/browser/profiles/profile_avatar_icon_util.h"
 #include "chrome/browser/themes/theme_properties.h"
 #include "chrome/browser/themes/theme_service.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/browser_window_utils.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_strip_controller.h"
 #import "chrome/browser/ui/cocoa/themed_window.h"
 #include "grit/theme_resources.h"
 #include "ui/base/cocoa/nsgraphics_context_additions.h"
 #import "ui/base/cocoa/nsview_additions.h"
 
 // Implementer's note: Moving the window controls is tricky. When altering the
 // code, ensure that:
 // - accessibility hit testing works
 // - the accessibility hierarchy is correct
 // - close/min in the background don't bring the window forward
 // - rollover effects work correctly
 
 namespace {
 
 // Size of the gradient. Empirically determined so that the gradient looks
 // like what the heuristic does when there are just a few tabs.
 const CGFloat kWindowGradientHeight = 24.0;
 
+enum FrameBrowserWindowLock {
+  SET_FRAME_LOCKED = 0,
+  SET_STYLEMASK_LOCKED = 1,
+  FRAMEBROWSERWINDOWLOCKCOUNT = 2
+};
+
+void LogUMASample(FrameBrowserWindowLock sample) {
+  UMA_HISTOGRAM_ENUMERATION("FramedBrowserWindowLock", sample,
+                            FRAMEBROWSERWINDOWLOCKCOUNT);
 }
 
+}  // namespace
+
 @interface FramedBrowserWindow (Private)
 
 - (void)adjustCloseButton:(NSNotification*)notification;
 - (void)adjustMiniaturizeButton:(NSNotification*)notification;
 - (void)adjustZoomButton:(NSNotification*)notification;
 - (void)adjustButton:(NSButton*)button
               ofKind:(NSWindowButton)kind;
+- (void)logUMASample:(FrameBrowserWindowLock)sample;
 
 @end
 
 @implementation FramedBrowserWindow
 
+- (void)setStyleMask:(NSUInteger)styleMask {
+  if (frameAndStyleMaskLock_) {
+    LogUMASample(FrameBrowserWindowLock::SET_FRAME_LOCKED);
+    return;
+  }
+  [super setStyleMask:styleMask];
+}
+
+- (void)setFrame:(NSRect)frameRect
+         display:(BOOL)flag
+         animate:(BOOL)animateFlag {
+  if (frameAndStyleMaskLock_) {
+    LogUMASample(FrameBrowserWindowLock::SET_STYLEMASK_LOCKED);
+    return;
+  }
+  [super setFrame:frameRect display:flag animate:animateFlag];
+}
+
 - (id)initWithContentRect:(NSRect)contentRect
               hasTabStrip:(BOOL)hasTabStrip{
   NSUInteger styleMask = NSTitledWindowMask |
                          NSClosableWindowMask |
                          NSMiniaturizableWindowMask |
                          NSResizableWindowMask |
                          NSTexturedBackgroundWindowMask;
   if ((self = [super initWithContentRect:contentRect
                                styleMask:styleMask
                                  backing:NSBackingStoreBuffered
@@ skipping 32 matching lines @@
                    name:NSViewFrameDidChangeNotification
                  object:closeButton_];
     [center addObserver:self
                selector:@selector(adjustMiniaturizeButton:)
                    name:NSViewFrameDidChangeNotification
                  object:miniaturizeButton_];
     [center addObserver:self
                selector:@selector(adjustZoomButton:)
                    name:NSViewFrameDidChangeNotification
                  object:zoomButton_];
+
+    frameAndStyleMaskLock_ = NO;
   }
 
   return self;
 }
 
 - (void)dealloc {
   [[NSNotificationCenter defaultCenter] removeObserver:self];
   [super dealloc];
 }
 
@@ skipping 60 matching lines @@
   if (!value) {
     value = [super accessibilityHitTest:point];
   }
   return value;
 }
 
 - (void)setShouldHideTitle:(BOOL)flag {
   shouldHideTitle_ = flag;
 }
 
+// This method sets a lock which prevents the the frame and style
+// of the window to be changed
+- (void)setFrameAndStyleMaskLock:(BOOL)lock {
+  frameAndStyleMaskLock_ = lock;
+}
+
 - (BOOL)_isTitleHidden {
   return shouldHideTitle_;
 }
 
 - (CGFloat)windowButtonsInterButtonSpacing {
   return windowButtonsInterButtonSpacing_;
 }
 
 // This method is called whenever a window is moved in order to ensure it fits
 // on the screen.  We cannot always handle resizes without breaking, so we
@@ skipping 148 matching lines @@
   ThemedWindowStyle windowStyle = [self themedWindowStyle];
   BOOL incognito = windowStyle & THEMED_INCOGNITO;
 
   if (incognito)
     return [NSColor whiteColor];
   else
     return [NSColor windowFrameTextColor];
 }
 
 @end