chrome/browser/ui/libgtk2ui/native_theme_gtk2.h

// Copyright (c) 2013 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 CHROME_BROWSER_UI_LIBGTK2UI_NATIVE_THEME_GTK2_H_
#define CHROME_BROWSER_UI_LIBGTK2UI_NATIVE_THEME_GTK2_H_

#include <gtk/gtk.h>

#include "chrome/browser/ui/libgtk2ui/owned_widget_gtk2.h"
#include "ui/native_theme/native_theme_base.h"

typedef struct _GdkColor GdkColor;

namespace libgtk2ui {

// A version of NativeTheme that uses GTK2 supplied colours instead of the
// default aura colours. Analogue to NativeThemeWin, except that can't be
// compiled into the main chrome binary like the Windows code can.
class NativeThemeGtk2 : public ui::NativeThemeBase {
 public:
  static NativeThemeGtk2* instance();

  // Overridden from ui::NativeThemeBase:
  gfx::Size GetPartSize(Part part,
                        State state,
                        const ExtraParams& extra) const override;
  void Paint(SkCanvas* canvas,
             Part part,
             State state,
             const gfx::Rect& rect,
             const ExtraParams& extra) const override;
  SkColor GetSystemColor(ColorId color_id) const override;
  void PaintMenuPopupBackground(
      SkCanvas* canvas,
      const gfx::Size& size,
      const MenuBackgroundExtraParams& menu_background) const override;
  void PaintMenuItemBackground(
      SkCanvas* canvas,
      State state,
      const gfx::Rect& rect,
      const MenuListExtraParams& menu_list) const override;

 private:
  NativeThemeGtk2();
  ~NativeThemeGtk2() override;

  // Implementation of GetSystemColor.
  GdkColor GetSystemGdkColor(ColorId color_id) const;

  // Returns styles associated with various widget types.
  GtkWidget* GetRealizedWindow() const;
  GtkStyle* GetWindowStyle() const;
  GtkStyle* GetEntryStyle() const;
  GtkStyle* GetLabelStyle() const;
  GtkStyle* GetButtonStyle() const;
  GtkStyle* GetTreeStyle() const;
  GtkStyle* GetTooltipStyle() const;
  GtkStyle* GetMenuStyle() const;
  GtkStyle* GetMenuItemStyle() const;

  void PaintComboboxArrow(SkCanvas* canvas,
                          GtkStateType state,
                          const gfx::Rect& rect) const;

  mutable GtkWidget* fake_window_;
  mutable GtkWidget* fake_tooltip_;
  mutable OwnedWidgetGtk fake_entry_;
  mutable OwnedWidgetGtk fake_label_;
  mutable OwnedWidgetGtk fake_button_;
  mutable OwnedWidgetGtk fake_tree_;

  mutable OwnedWidgetGtk fake_menu_;
  mutable GtkWidget* fake_menu_item_;

  DISALLOW_COPY_AND_ASSIGN(NativeThemeGtk2);
};

}  // namespace libgtk2ui

#endif  // CHROME_BROWSER_UI_LIBGTK2UI_NATIVE_THEME_GTK2_H_