ui/views/controls/scrollbar/native_scroll_bar_views.h

   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/geometry/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   ~NativeScrollBarViews() override;
  34
  35  private:
  36   // View overrides:
  37   void Layout() override;
  38   void OnPaint(gfx::Canvas* canvas) override;
  39   gfx::Size GetPreferredSize() const override;
  40   const char* GetClassName() const override;
  41
  42   // ScrollBar overrides:
  43   int GetLayoutSize() const override;
  44
  45   // BaseScrollBar overrides:
  46   void ScrollToPosition(int position) override;
  47   int GetScrollIncrement(bool is_page, bool is_positive) override;
  48
  49   // BaseButton::ButtonListener overrides:
  50   void ButtonPressed(Button* sender, const ui::Event& event) override;
  51
  52   // NativeScrollBarWrapper overrides:
  53   int GetPosition() const override;
  54   View* GetView() override;
  55   void Update(int viewport_size, int content_size, int current_pos) override;
  56
  57   // Returns the area for the track. This is the area of the scrollbar minus
  58   // the size of the arrow buttons.
  59   gfx::Rect GetTrackBounds() const override;
  60
  61   // The NativeScrollBar we are bound to.
  62   NativeScrollBar* native_scroll_bar_;
  63
  64   // The scroll bar buttons (Up/Down, Left/Right).
  65   Button* prev_button_;
  66   Button* next_button_;
  67
  68   ui::NativeTheme::ExtraParams params_;
  69   ui::NativeTheme::Part part_;
  70   ui::NativeTheme::State state_;
  71
  72   DISALLOW_COPY_AND_ASSIGN(NativeScrollBarViews);
  73 };
  74
  75 }  // namespace views
  76
  77 #endif  // UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_VIEWS_H_