[Mac] Refactor the fullscreen toolbar animation

chrome/browser/ui/cocoa/fullscreen/fullscreen_toolbar_animation_controller.h

+// Copyright 2016 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_FULLSCREEN_FULLSCREEN_TOOLBAR_ANIMATION_CONTROLLER_H_
+#define CHROME_BROWSER_UI_COCOA_FULLSCREEN_FULLSCREEN_TOOLBAR_ANIMATION_CONTROLLER_H_
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/timer/timer.h"
+#include "ui/gfx/animation/animation_delegate.h"
+#include "ui/gfx/animation/slide_animation.h"
+
+@class FullscreenToolbarController;
+
+class FullscreenToolbarAnimationController : public gfx::AnimationDelegate {
+ public:
+  FullscreenToolbarAnimationController(FullscreenToolbarController* owner);
+
+  // Called by |owner_| to when the fullscreen toolbar layout is updated.

[erikchen, 2016/10/21 19:36:59]

s/to//

Also I'd recommend the name ToolbarDidUpdate, to indicate that this is reacting
to a change, rather than inducing one.

[spqchan, 2016/10/21 20:34:18]

Done.

+  void UpdateToolbar();
+
+  // Stops the animation and cancels |hide_toolbar_timer_|.
+  void StopAnimationAndTimer();
+
+  // Animates the toolbar in and out to show changes with the tabstrip.
+  void AnimateToolbarForTabstripChanges();
+
+  // Animates the toolbar in if it's not fully shown.
+  void AnimateToolbarIn();
+
+  // Animates the toolbar out if it's not focused.
+  void AnimateToolbarOutIfPossible();
+
+  // Returns the toolbar fraction calculated from the animation progress.
+  CGFloat GetToolbarFractionFromProgress() const;
+
+  // Returns true if |animation_| is running.
+  BOOL IsAnimationRunning() const;
+
+  // gfx::AnimationDelegate:
+  void AnimationProgressed(const gfx::Animation* animation) override;
+  void AnimationEnded(const gfx::Animation* animation) override;
+
+ private:
+  // Our owner.
+  FullscreenToolbarController* owner_;  // weak
+
+  // The animation of the decoration.
+  gfx::SlideAnimation animation_;
+
+  // Timer that will start the scrollbar's hiding animation when it reaches 0.
+  base::Timer hide_toolbar_timer_;
+
+  // The value that the animation should start from.
+  CGFloat animation_start_value_;
+
+  // True when the toolbar is dropped to show tabstrip changes.
+  BOOL should_hide_toolbar_after_delay_;
+};
+
+#endif  // CHROME_BROWSER_UI_COCOA_FULLSCREEN_FULLSCREEN_TOOLBAR_ANIMATION_CONTROLLER_H_