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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_UI_VIEWS_FRAME_CONTENTS_CONTAINER_H_
      6 #define CHROME_BROWSER_UI_VIEWS_FRAME_CONTENTS_CONTAINER_H_
      7 #pragma once
      8 
      9 #include "base/memory/scoped_ptr.h"
     10 #include "ui/base/animation/animation_delegate.h"
     11 #include "views/view.h"
     12 
     13 class TabContents;
     14 
     15 namespace ui {
     16 class SlideAnimation;
     17 }
     18 
     19 namespace views {
     20 class Widget;
     21 }
     22 
     23 // ContentsContainer is responsible for managing the TabContents views.
     24 // ContentsContainer has up to two children: one for the currently active
     25 // TabContents and one for instant's TabContents.
     26 class ContentsContainer : public views::View, public ui::AnimationDelegate {
     27  public:
     28   explicit ContentsContainer(views::View* active);
     29   virtual ~ContentsContainer();
     30 
     31   // Makes the preview view the active view and nulls out the old active view.
     32   // It's assumed the caller will delete or remove the old active view
     33   // separately.
     34   void MakePreviewContentsActiveContents();
     35 
     36   // Sets the preview view. This does not delete the old.
     37   void SetPreview(views::View* preview, TabContents* preview_tab_contents);
     38 
     39   TabContents* preview_tab_contents() const { return preview_tab_contents_; }
     40 
     41   // Sets the active top margin.
     42   void SetActiveTopMargin(int margin);
     43 
     44   // Returns the bounds of the preview. If the preview isn't active this
     45   // retuns the bounds the preview would be shown at.
     46   gfx::Rect GetPreviewBounds();
     47 
     48   // Fades out the active contents.
     49   void FadeActiveContents();
     50 
     51   // Shows the fade. This is similiar to |FadeActiveContents|, but is immediate.
     52   void ShowFade();
     53 
     54   // Removes the fade. This is done implicitly when the preview is made active.
     55   void RemoveFade();
     56 
     57   // View overrides:
     58   virtual void Layout();
     59 
     60   // ui::AnimationDelegate overrides:
     61   virtual void AnimationProgressed(const ui::Animation* animation);
     62 
     63  private:
     64   class OverlayContentView;
     65 
     66   // Creates the overlay widget. The opacity is set at |initial_opacity|.
     67   void CreateOverlay(int initial_opacity);
     68 
     69   // Invoked when the contents view of the overlay is destroyed.
     70   void OverlayViewDestroyed();
     71 
     72   views::View* active_;
     73 
     74   views::View* preview_;
     75 
     76   TabContents* preview_tab_contents_;
     77 
     78   // Translucent Widget positioned right above the active view that is used to
     79   // make the active view appear faded out.
     80   views::Widget* active_overlay_;
     81 
     82   // Content view of active_overlay. Used to track when the widget is destroyed.
     83   OverlayContentView* overlay_view_;
     84 
     85   // Animation used to vary the opacity of active_overlay.
     86   scoped_ptr<ui::SlideAnimation> overlay_animation_;
     87 
     88   // The margin between the top and the active view. This is used to make the
     89   // preview overlap the bookmark bar on the new tab page.
     90   int active_top_margin_;
     91 
     92   DISALLOW_COPY_AND_ASSIGN(ContentsContainer);
     93 };
     94 
     95 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_CONTENTS_CONTAINER_H_
     96