ui/views/controls/scrollbar/native_scroll_bar.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_H_
   6 #define UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_H_
   7
   8 #include <string>
   9
  10 #include "base/compiler_specific.h"
  11 #include "base/gtest_prod_util.h"
  12 #include "ui/views/controls/scrollbar/scroll_bar.h"
  13 #include "ui/views/view.h"
  14
  15 namespace ui {
  16 class NativeTheme;
  17 }
  18
  19 namespace views {
  20
  21 class NativeScrollBarWrapper;
  22
  23 // The NativeScrollBar class is a scrollbar that uses platform's
  24 // native control.
  25 class VIEWS_EXPORT NativeScrollBar : public ScrollBar {
  26  public:
  27   // The scroll-bar's class name.
  28   static const char kViewClassName[];
  29
  30   // Create new scrollbar, either horizontal or vertical.
  31   explicit NativeScrollBar(bool is_horiz);
  32   ~NativeScrollBar() override;
  33
  34   // Return the system sizes.
  35   static int GetHorizontalScrollBarHeight(const ui::NativeTheme* theme);
  36   static int GetVerticalScrollBarWidth(const ui::NativeTheme* theme);
  37
  38  private:
  39   friend class NativeScrollBarTest;
  40   FRIEND_TEST_ALL_PREFIXES(NativeScrollBarTest, Scrolling);
  41
  42   // Overridden from View.
  43   gfx::Size GetPreferredSize() const override;
  44   void Layout() override;
  45   void ViewHierarchyChanged(
  46       const ViewHierarchyChangedDetails& details) override;
  47   const char* GetClassName() const override;
  48
  49   // Overrideen from View for keyboard UI purpose.
  50   bool OnKeyPressed(const ui::KeyEvent& event) override;
  51   bool OnMouseWheel(const ui::MouseWheelEvent& e) override;
  52
  53   // Overridden from ui::EventHandler.
  54   void OnGestureEvent(ui::GestureEvent* event) override;
  55
  56   // Overridden from ScrollBar.
  57   void Update(int viewport_size, int content_size, int current_pos) override;
  58   int GetPosition() const override;
  59   int GetLayoutSize() const override;
  60
  61   // init border
  62   NativeScrollBarWrapper* native_wrapper_;
  63
  64   DISALLOW_COPY_AND_ASSIGN(NativeScrollBar);
  65 };
  66
  67 }  // namespace views
  68
  69 #endif  // UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_H_