Adds functionality to anchor widgets to the top-of-window views in immersive mode

chrome/browser/ui/views/frame/immersive_mode_controller_ash.h

 // Copyright 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_FRAME_IMMERSIVE_MODE_CONTROLLER_ASH_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_IMMERSIVE_MODE_CONTROLLER_ASH_H_
 
 #include "chrome/browser/ui/views/frame/immersive_mode_controller.h"
 
 #include "base/timer.h"
 #include "ui/base/events/event_handler.h"
-#include "ui/gfx/native_widget_types.h"
+#include "ui/compositor/layer_animation_observer.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/widget/widget_observer.h"
 
 class BrowserView;
 
+namespace {
+class AnchoredWidgetManager;
+}
+
+namespace aura {
+class Window;
+}
+
+namespace gfx {
+class Transform;
+}
+
+namespace ui {
+class Layer;
+}
+
 namespace views {
 class View;
 }
 
 class ImmersiveModeControllerAsh : public ImmersiveModeController,
                                    public ui::EventHandler,
+                                   public ui::ImplicitAnimationObserver,
                                    public views::FocusChangeListener,
                                    public views::WidgetObserver {
  public:
   ImmersiveModeControllerAsh();
   virtual ~ImmersiveModeControllerAsh();
 
   // These methods are used to increment and decrement |revealed_lock_count_|.
   // If immersive mode is enabled, a transition from 1 to 0 in
   // |revealed_lock_count_| closes the top-of-window views and a transition
   // from 0 to 1 in |revealed_lock_count_| reveals the top-of-window views.
   void LockRevealedState();
   void UnlockRevealedState();
 
+  // Shows the reveal view without any animations if immersive mode is enabled.
+  void MaybeRevealWithoutAnimation();
+
+  // Returns true if the top-of-window views are animating. This differs from
+  // when |reveal_state_| is SLIDING_OPEN / SLIDING_CLOSED when the controller
+  // is in the process of starting an animation via MaybeStartReveal() /
+  // MaybeEndReveal(). is_animating() starts returning true when the animation
+  // actually starts instead of at the start of the call to MaybeStartReveal()
+  // or MaybeEndReveal().
+  bool is_animating() const {
+    return is_animating_;
+  }
+
   // ImmersiveModeController overrides:
   virtual void Init(BrowserView* browser_view) OVERRIDE;
   virtual void SetEnabled(bool enabled) OVERRIDE;
   virtual bool IsEnabled() const OVERRIDE;
   virtual bool ShouldHideTabIndicators() const OVERRIDE;
   virtual bool ShouldHideTopViews() const OVERRIDE;
   virtual bool IsRevealed() const OVERRIDE;
   virtual void MaybeStackViewAtTop() OVERRIDE;
   virtual ImmersiveModeController::RevealedLock*
       GetRevealedLock() OVERRIDE WARN_UNUSED_RESULT;
+  virtual void AnchorWidgetToTopContainer(views::Widget* widget,
+                                          int y_offset) OVERRIDE;
+  virtual void UnanchorWidgetFromTopContainer(views::Widget* widget) OVERRIDE;
+  virtual void OnTopContainerBoundsChanged() OVERRIDE;
 
   // ui::EventHandler overrides:
   virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
 
   // views::FocusChangeObserver overrides:
   virtual void OnWillChangeFocus(views::View* focused_before,
                                  views::View* focused_now) OVERRIDE;
   virtual void OnDidChangeFocus(views::View* focused_before,
                                 views::View* focused_now) OVERRIDE;
 
   // views::WidgetObserver overrides:
   virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE;
   virtual void OnWidgetActivationChanged(views::Widget* widget,
                                          bool active) OVERRIDE;
 
+  // ui::ImplicitAnimationObserver override:
+  virtual void OnImplicitAnimationsCompleted() OVERRIDE;
+
   // Testing interface.
   void SetHideTabIndicatorsForTest(bool hide);
   void StartRevealForTest(bool hovered);
   void SetMouseHoveredForTest(bool hovered);
 
  private:
   enum Animate {
     ANIMATE_NO,
     ANIMATE_SLOW,
     ANIMATE_FAST,
@@ skipping 16 matching lines @@
   // Acquire the mouse revealed lock if it is not already held.
   void AcquireMouseRevealedLock();
 
   // Update |focus_revealed_lock_| based on the currently active view and the
   // currently active widget.
   void UpdateFocusRevealedLock();
 
   // Returns the animation duration given |animate|.
   int GetAnimationDuration(Animate animate) const;
 
-  // Reveals the top-of-window views if immersive mode is enabled.
-  void MaybeStartReveal();
-
   // Temporarily reveals the top-of-window views while in immersive mode,
   // hiding them when the cursor exits the area of the top views. If |animate|
   // is not ANIMATE_NO, slides in the view, otherwise shows it immediately.
-  void StartReveal(Animate animate);
+  void MaybeStartReveal(Animate animate);
 
   // Enables or disables layer-based painting to allow smooth animations.
   void EnablePaintToLayer(bool enable);
 
   // Updates layout for |browser_view_| including window caption controls and
   // tab strip style |immersive_style|.
   void LayoutBrowserView(bool immersive_style);
 
-  // Slides open the reveal view at the top of the screen.
-  void AnimateSlideOpen(int duration_ms);
+  // Called when the animation to slide open the top-of-window views has
+  // completed.
   void OnSlideOpenAnimationCompleted();
 
   // Hides the top-of-window views if immersive mode is enabled and nothing is
   // keeping them revealed. Optionally animates.
   void MaybeEndReveal(Animate animate);
 
-  // Hides the top-of-window views. Optionally animates.
-  void EndReveal(Animate animate);
+  // Called when the animation to slide out the top-of-window views has
+  // completed.
+  void OnSlideClosedAnimationCompleted();
 
-  // Slide out the reveal view.
-  void AnimateSlideClosed(int duration_ms);
-  void OnSlideClosedAnimationCompleted();
+  // Starts an animation for the top-of-window views and any anchored widgets
+  // of |duration_ms| to |target_transform|.
+  void DoAnimation(const gfx::Transform& target_transform, int duration_ms);
+
+  // Starts an animation for |layer| of |duration_ms| to |target_transform|.
+  // If non-NULL, sets |observer| to be notified when the animation completes.
+  void DoLayerAnimation(ui::Layer* layer,
+                        const gfx::Transform& target_transform,
+                        int duration_ms,
+                        ui::ImplicitAnimationObserver* observer);
 
   // Browser view holding the views to be shown and hidden. Not owned.
   BrowserView* browser_view_;
 
   // True when in immersive mode.
   bool enabled_;
 
   // State machine for the revealed/closed animations.
   RevealState reveal_state_;
 
+  bool is_animating_;

[James Cook, 2013/04/11 17:33:53]

nit: Either comment here or refer to accessor comment above

+
   int revealed_lock_count_;
 
   // True if the miniature "tab indicators" should be hidden in the main browser
   // view when immersive mode is enabled.
   bool hide_tab_indicators_;
 
   // Timer to track cursor being held at the top.
   base::OneShotTimer<ImmersiveModeController> top_timer_;
 
   // Lock which keeps the top-of-window views revealed based on the current
   // mouse state.
   scoped_ptr<RevealedLock> mouse_revealed_lock_;
 
   // Lock which keeps the top-of-window views revealed based on the focused view
   // and the active widget.
   scoped_ptr<RevealedLock> focus_revealed_lock_;
 
   // Native window for the browser, needed to clean up observers.
-  gfx::NativeWindow native_window_;
+  aura::Window* native_window_;
 
-#if defined(USE_AURA)
   // Observer to disable immersive mode when window leaves the maximized state.
   class WindowObserver;
   scoped_ptr<WindowObserver> window_observer_;
-#endif
 
-  // Animation observers. They must be separate because animations can be
-  // aborted and have their observers triggered at any time and the state
-  // machine needs to know which animation completed.
-  class AnimationObserver;
-  scoped_ptr<AnimationObserver> slide_open_observer_;
-  scoped_ptr<AnimationObserver> slide_closed_observer_;
+  // Manages widgets which are anchored to the top-of-window views.
+  scoped_ptr<AnchoredWidgetManager> anchored_widget_manager_;
 
   base::WeakPtrFactory<ImmersiveModeControllerAsh> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ImmersiveModeControllerAsh);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_IMMERSIVE_MODE_CONTROLLER_ASH_H_