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      1 // Copyright (c) 2012 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 UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_VIEWS_H_
      6 #define UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_VIEWS_H_
      7 
      8 #include "base/compiler_specific.h"
      9 #include "ui/gfx/point.h"
     10 #include "ui/native_theme/native_theme.h"
     11 #include "ui/views/controls/button/button.h"
     12 #include "ui/views/controls/scrollbar/base_scroll_bar.h"
     13 #include "ui/views/controls/scrollbar/native_scroll_bar_wrapper.h"
     14 #include "ui/views/view.h"
     15 
     16 namespace gfx {
     17 class Canvas;
     18 }
     19 
     20 namespace views {
     21 
     22 class NativeScrollBar;
     23 
     24 // Views implementation for the scrollbar.
     25 class VIEWS_EXPORT NativeScrollBarViews : public BaseScrollBar,
     26                                           public ButtonListener,
     27                                           public NativeScrollBarWrapper {
     28  public:
     29   static const char kViewClassName[];
     30 
     31   // Creates new scrollbar, either horizontal or vertical.
     32   explicit NativeScrollBarViews(NativeScrollBar* native_scroll_bar);
     33   virtual ~NativeScrollBarViews();
     34 
     35  private:
     36   // View overrides:
     37   virtual void Layout() OVERRIDE;
     38   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
     39   virtual gfx::Size GetPreferredSize() OVERRIDE;
     40   virtual const char* GetClassName() const OVERRIDE;
     41 
     42   // ScrollBar overrides:
     43   virtual int GetLayoutSize() const OVERRIDE;
     44 
     45   // BaseScrollBar overrides:
     46   virtual void ScrollToPosition(int position) OVERRIDE;
     47   virtual int GetScrollIncrement(bool is_page, bool is_positive) OVERRIDE;
     48 
     49   // BaseButton::ButtonListener overrides:
     50   virtual void ButtonPressed(Button* sender,
     51                              const ui::Event& event) OVERRIDE;
     52 
     53   // NativeScrollBarWrapper overrides:
     54   virtual int GetPosition() const OVERRIDE;
     55   virtual View* GetView() OVERRIDE;
     56   virtual void Update(int viewport_size,
     57                       int content_size,
     58                       int current_pos) OVERRIDE;
     59 
     60   // Returns the area for the track. This is the area of the scrollbar minus
     61   // the size of the arrow buttons.
     62   virtual gfx::Rect GetTrackBounds() const OVERRIDE;
     63 
     64   // The NativeScrollBar we are bound to.
     65   NativeScrollBar* native_scroll_bar_;
     66 
     67   // The scroll bar buttons (Up/Down, Left/Right).
     68   Button* prev_button_;
     69   Button* next_button_;
     70 
     71   ui::NativeTheme::ExtraParams params_;
     72   ui::NativeTheme::Part part_;
     73   ui::NativeTheme::State state_;
     74 
     75   DISALLOW_COPY_AND_ASSIGN(NativeScrollBarViews);
     76 };
     77 
     78 }  // namespace views
     79 
     80 #endif  // UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_VIEWS_H_
     81