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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_CHROMEOS_PANELS_PANEL_SCROLLER_H_
      6 #define CHROME_BROWSER_CHROMEOS_PANELS_PANEL_SCROLLER_H_
      7 #pragma once
      8 
      9 #include <vector>
     10 
     11 #include "base/basictypes.h"
     12 #include "ui/base/animation/animation_delegate.h"
     13 #include "ui/base/animation/slide_animation.h"
     14 #include "views/view.h"
     15 
     16 class PanelScrollerHeader;
     17 
     18 class PanelScroller : public views::View, public ui::AnimationDelegate {
     19  public:
     20   PanelScroller();
     21   ~PanelScroller();
     22 
     23   static PanelScroller* CreateWindow();
     24 
     25   // Overridden from View:
     26   virtual void ViewHierarchyChanged(bool is_add,
     27                                     views::View* parent,
     28                                     views::View* child) OVERRIDE;
     29   virtual gfx::Size GetPreferredSize() OVERRIDE;
     30   virtual void Layout() OVERRIDE;
     31   virtual bool OnMousePressed(const views::MouseEvent& event) OVERRIDE;
     32   virtual bool OnMouseDragged(const views::MouseEvent& event) OVERRIDE;
     33 
     34   // Called when a panel header is clicked with the affected container. This
     35   // function will make sure the panel is fully visible.
     36   void HeaderClicked(PanelScrollerHeader* source);
     37 
     38  private:
     39   struct Panel;
     40 
     41   // ui::AnimationDelegate overrides.
     42   virtual void AnimationProgressed(const ui::Animation* animation);
     43 
     44   // Scrolls to the panel at the given index. It will be moved to the top.
     45   void ScrollToPanel(int index);
     46 
     47   // All panels in this scroller.
     48   std::vector<Panel*> panels_;
     49 
     50   // Height in pixels of the headers above each panel.
     51   int divider_height_;
     52 
     53   bool needs_layout_;
     54 
     55   // The current scroll position.
     56   int scroll_pos_;
     57 
     58   ui::SlideAnimation animation_;
     59 
     60   // When animating a scroll, these indicate the beginning and ending of the
     61   // scroll. The scroll_pos_ always indicates the current one.
     62   int animated_scroll_begin_;
     63   int animated_scroll_end_;
     64 
     65   DISALLOW_COPY_AND_ASSIGN(PanelScroller);
     66 };
     67 
     68 #endif  // CHROME_BROWSER_CHROMEOS_PANELS_PANEL_SCROLLER_H_
     69 
     70