Changes look for scrollbars on windows (2)

ui/native_theme/native_theme_aurawin.h

+// Copyright 2014 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_NATIVE_THEME_NATIVE_THEME_AURAWIN_H_
+#define UI_NATIVE_THEME_NATIVE_THEME_AURAWIN_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ui/native_theme/native_theme_aura.h"
+
+namespace gfx {
+class NineImagePainter;
+}
+
+namespace ui {
+
+// Aura implementation of native theme support.
+class NATIVE_THEME_EXPORT NativeThemeAuraWin : public NativeThemeAura {
+ public:
+  static NativeThemeAuraWin* instance();
+
+ private:
+  NativeThemeAuraWin();
+  virtual ~NativeThemeAuraWin();
+
+  // Overridden from NativeThemeBase:
+  virtual gfx::Size GetPartSize(Part part,
+                                State state,
+                                const ExtraParams& extra) const OVERRIDE;
+  virtual void PaintArrowButton(SkCanvas* gc,
+                                const gfx::Rect& rect,
+                                Part direction,
+                                State state) const OVERRIDE;
+  virtual void PaintScrollbarTrack(
+      SkCanvas* sk_canvas,
+      Part part,
+      State state,
+      const ScrollbarTrackExtraParams& extra_params,
+      const gfx::Rect& rect) const OVERRIDE;
+  virtual void PaintScrollbarThumb(SkCanvas* sk_canvas,
+                                   Part part,
+                                   State state,
+                                   const gfx::Rect& rect) const OVERRIDE;
+
+  // Returns the NineImagePainter used to paint the specified state, creating if
+  // necessary. If no image is provided for the specified state the normal state
+  // images are used.
+  gfx::NineImagePainter* GetOrCreatePainter(
+      const int image_ids[kMaxState][9],
+      State state,
+      scoped_ptr<gfx::NineImagePainter> painters[kMaxState]) const;
+
+  // Paints |painter| into the canvas using |rect|.
+  void PaintPainter(gfx::NineImagePainter* painter,
+                    SkCanvas* sk_canvas,
+                    const gfx::Rect& rect) const;
+
+  mutable scoped_ptr<gfx::NineImagePainter> scrollbar_track_painter_;
+
+  mutable scoped_ptr<gfx::NineImagePainter>
+      scrollbar_thumb_painters_[kMaxState];
+
+  mutable scoped_ptr<gfx::NineImagePainter>
+      scrollbar_arrow_button_painters_[kMaxState];
+
+  DISALLOW_COPY_AND_ASSIGN(NativeThemeAuraWin);
+};
+
+}  // namespace ui
+
+#endif  // UI_NATIVE_THEME_NATIVE_THEME_AURAWIN_H_