views: add focus ring to TreeView

ui/views/controls/scroll_view.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_CONTROLS_SCROLL_VIEW_H_
 #define UI_VIEWS_CONTROLS_SCROLL_VIEW_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 70 matching lines @@
 
   // Returns the horizontal/vertical scrollbar. This may return NULL.
   const ScrollBar* horizontal_scroll_bar() const { return horiz_sb_; }
   const ScrollBar* vertical_scroll_bar() const { return vert_sb_; }
 
   // Customize the scrollbar design. ScrollView takes the ownership of the
   // specified ScrollBar. |horiz_sb| and |vert_sb| cannot be NULL.
   void SetHorizontalScrollBar(ScrollBar* horiz_sb);
   void SetVerticalScrollBar(ScrollBar* vert_sb);
 
+  // Sets whether this ScrollView has a focus ring or not.
+  void SetHasFocusRing(bool has_focus_ring);
+
   // View overrides:
   gfx::Size GetPreferredSize() const override;
   int GetHeightForWidth(int width) const override;
   void Layout() override;
   bool OnKeyPressed(const ui::KeyEvent& event) override;
   bool OnMouseWheel(const ui::MouseWheelEvent& e) override;
   void OnMouseEntered(const ui::MouseEvent& event) override;
   void OnMouseExited(const ui::MouseEvent& event) override;
   void OnScrollEvent(ui::ScrollEvent* event) override;
   void OnGestureEvent(ui::GestureEvent* event) override;
@@ skipping 73 matching lines @@
   int max_height_;
 
   // The background color given to the viewport (for overscroll), and to the
   // contents when scrolling with layers.
   SkColor background_color_;
 
   // If true, never show the horizontal scrollbar (even if the contents is wider
   // than the viewport).
   bool hide_horizontal_scrollbar_;
 
+  // Focus ring, if one is installed.
+  View* focus_ring_ = nullptr;
+
   DISALLOW_COPY_AND_ASSIGN(ScrollView);
 };
 
 // VariableRowHeightScrollHelper is intended for views that contain rows of
 // varying height. To use a VariableRowHeightScrollHelper create one supplying
 // a Controller and delegate GetPageScrollIncrement and GetLineScrollIncrement
 // to the helper. VariableRowHeightScrollHelper calls back to the
 // Controller to determine row boundaries.
 class VariableRowHeightScrollHelper {
  public:
@@ skipping 56 matching lines @@
  private:
   int top_margin_;
   int row_height_;
 
   DISALLOW_COPY_AND_ASSIGN(FixedRowHeightScrollHelper);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SCROLL_VIEW_H_