It is time.

ui/native_theme/native_theme.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_NATIVE_THEME_NATIVE_THEME_H_
-#define UI_NATIVE_THEME_NATIVE_THEME_H_
-
-#include "base/observer_list.h"
-#include "third_party/skia/include/core/SkColor.h"
-#include "ui/gfx/native_widget_types.h"
-#include "ui/native_theme/native_theme_export.h"
-
-class SkCanvas;
-
-namespace gfx {
-class Rect;
-class Size;
-}
-
-namespace ui {
-
-class NativeThemeObserver;
-
-// This class supports drawing UI controls (like buttons, text fields, lists,
-// comboboxes, etc) that look like the native UI controls of the underlying
-// platform, such as Windows or Linux. It also supplies default colors for
-// dialog box backgrounds, etc., which are obtained from the system theme where
-// possible.
-//
-// The supported control types are listed in the Part enum.  These parts can be
-// in any state given by the State enum, where the actual definition of the
-// state is part-specific. The supported colors are listed in the ColorId enum.
-//
-// Some parts require more information than simply the state in order to be
-// drawn correctly, and this information is given to the Paint() method via the
-// ExtraParams union.  Each part that requires more information has its own
-// field in the union.
-//
-// NativeTheme also supports getting the default size of a given part with
-// the GetPartSize() method.
-class NATIVE_THEME_EXPORT NativeTheme {
- public:
-  // The part to be painted / sized.
-  enum Part {
-    kComboboxArrow,
-    kCheckbox,
-    kInnerSpinButton,
-    kMenuList,
-    kMenuCheck,
-    kMenuCheckBackground,
-    kMenuPopupArrow,
-    kMenuPopupBackground,
-    kMenuPopupGutter,
-    kMenuPopupSeparator,
-    kMenuItemBackground,
-    kProgressBar,
-    kPushButton,
-    kRadio,
-
-    // The order of the arrow enums is important, do not change without also
-    // changing the code in platform implementations.
-    kScrollbarDownArrow,
-    kScrollbarLeftArrow,
-    kScrollbarRightArrow,
-    kScrollbarUpArrow,
-
-    kScrollbarHorizontalThumb,
-    kScrollbarVerticalThumb,
-    kScrollbarHorizontalTrack,
-    kScrollbarVerticalTrack,
-    kScrollbarHorizontalGripper,
-    kScrollbarVerticalGripper,
-    // The corner is drawn when there is both a horizontal and vertical
-    // scrollbar.
-    kScrollbarCorner,
-    kSliderTrack,
-    kSliderThumb,
-    kTabPanelBackground,
-    kTextField,
-    kTrackbarThumb,
-    kTrackbarTrack,
-    kWindowResizeGripper,
-    kMaxPart,
-  };
-
-  // The state of the part.
-  enum State {
-    // IDs defined as specific values for use in arrays.
-    kDisabled = 0,
-    kHovered  = 1,
-    kNormal   = 2,
-    kPressed  = 3,
-    kNumStates = kPressed + 1,
-  };
-
-  // Each structure below holds extra information needed when painting a given
-  // part.
-
-  struct ButtonExtraParams {
-    bool checked;
-    bool indeterminate;  // Whether the button state is indeterminate.
-    bool is_default;  // Whether the button is default button.
-    bool is_focused;
-    bool has_border;
-    int classic_state;  // Used on Windows when uxtheme is not available.
-    SkColor background_color;
-  };
-
-  struct InnerSpinButtonExtraParams {
-    bool spin_up;
-    bool read_only;
-    int classic_state;  // Used on Windows when uxtheme is not available.
-  };
-
-  struct MenuArrowExtraParams {
-    bool pointing_right;
-    // Used for the disabled state to indicate if the item is both disabled and
-    // selected.
-    bool is_selected;
-  };
-
-  struct MenuCheckExtraParams {
-    bool is_radio;
-    // Used for the disabled state to indicate if the item is both disabled and
-    // selected.
-    bool is_selected;
-  };
-
-  struct MenuItemExtraParams {
-    bool is_selected;
-  };
-
-  struct MenuListExtraParams {
-    bool has_border;
-    bool has_border_radius;
-    int arrow_x;
-    int arrow_y;
-    SkColor background_color;
-    int classic_state;  // Used on Windows when uxtheme is not available.
-  };
-
-  struct MenuSeparatorExtraParams {
-    bool has_gutter;
-  };
-
-  struct MenuBackgroundExtraParams {
-    int corner_radius;
-  };
-
-  struct ProgressBarExtraParams {
-    double animated_seconds;
-    bool determinate;
-    int value_rect_x;
-    int value_rect_y;
-    int value_rect_width;
-    int value_rect_height;
-  };
-
-  struct ScrollbarArrowExtraParams {
-    bool is_hovering;
-  };
-
-  struct ScrollbarTrackExtraParams {
-    bool is_upper;
-    int track_x;
-    int track_y;
-    int track_width;
-    int track_height;
-    int classic_state;  // Used on Windows when uxtheme is not available.
-  };
-
-  struct ScrollbarThumbExtraParams {
-    bool is_hovering;
-  };
-
-  struct SliderExtraParams {
-    bool vertical;
-    bool in_drag;
-  };
-
-  struct TextFieldExtraParams {
-    bool is_text_area;
-    bool is_listbox;
-    SkColor background_color;
-    bool is_read_only;
-    bool is_focused;
-    bool fill_content_area;
-    bool draw_edges;
-    int classic_state;  // Used on Windows when uxtheme is not available.
-  };
-
-  struct TrackbarExtraParams {
-    bool vertical;
-    int classic_state;  // Used on Windows when uxtheme is not available.
-  };
-
-  union ExtraParams {
-    ButtonExtraParams button;
-    InnerSpinButtonExtraParams inner_spin;
-    MenuArrowExtraParams menu_arrow;
-    MenuCheckExtraParams menu_check;
-    MenuItemExtraParams menu_item;
-    MenuListExtraParams menu_list;
-    MenuSeparatorExtraParams menu_separator;
-    MenuBackgroundExtraParams menu_background;
-    ProgressBarExtraParams progress_bar;
-    ScrollbarArrowExtraParams scrollbar_arrow;
-    ScrollbarTrackExtraParams scrollbar_track;
-    ScrollbarThumbExtraParams scrollbar_thumb;
-    SliderExtraParams slider;
-    TextFieldExtraParams text_field;
-    TrackbarExtraParams trackbar;
-  };
-
-  // Return the size of the part.
-  virtual gfx::Size GetPartSize(Part part,
-                                State state,
-                                const ExtraParams& extra) const = 0;
-
-  // Paint the part to the canvas.
-  virtual void Paint(SkCanvas* canvas,
-                     Part part,
-                     State state,
-                     const gfx::Rect& rect,
-                     const ExtraParams& extra) const = 0;
-
-  // Paint part during state transition, used for overlay scrollbar state
-  // transition animation.
-  virtual void PaintStateTransition(SkCanvas* canvas,
-                                    Part part,
-                                    State startState,
-                                    State endState,
-                                    double progress,
-                                    const gfx::Rect& rect) const { }
-
-  // Supports theme specific colors.
-  void SetScrollbarColors(unsigned inactive_color,
-                          unsigned active_color,
-                          unsigned track_color);
-
-  // Colors for GetSystemColor().
-  enum ColorId {
-    // Windows
-    kColorId_WindowBackground,
-    // Dialogs
-    kColorId_DialogBackground,
-    // FocusableBorder
-    kColorId_FocusedBorderColor,
-    kColorId_UnfocusedBorderColor,
-    // Button
-    kColorId_ButtonBackgroundColor,
-    kColorId_ButtonEnabledColor,
-    kColorId_ButtonDisabledColor,
-    kColorId_ButtonHighlightColor,
-    kColorId_ButtonHoverColor,
-    kColorId_ButtonHoverBackgroundColor,
-    kColorId_BlueButtonEnabledColor,
-    kColorId_BlueButtonDisabledColor,
-    kColorId_BlueButtonPressedColor,
-    kColorId_BlueButtonHoverColor,
-    kColorId_BlueButtonShadowColor,
-    // MenuItem
-    kColorId_EnabledMenuItemForegroundColor,
-    kColorId_DisabledMenuItemForegroundColor,
-    kColorId_DisabledEmphasizedMenuItemForegroundColor,
-    kColorId_SelectedMenuItemForegroundColor,
-    kColorId_FocusedMenuItemBackgroundColor,
-    kColorId_HoverMenuItemBackgroundColor,
-    kColorId_MenuSeparatorColor,
-    kColorId_MenuBackgroundColor,
-    kColorId_MenuBorderColor,
-    // MenuButton - buttons in wrench menu
-    kColorId_EnabledMenuButtonBorderColor,
-    kColorId_FocusedMenuButtonBorderColor,
-    kColorId_HoverMenuButtonBorderColor,
-    // Label
-    kColorId_LabelEnabledColor,
-    kColorId_LabelDisabledColor,
-    kColorId_LabelBackgroundColor,
-    // Textfield
-    kColorId_TextfieldDefaultColor,
-    kColorId_TextfieldDefaultBackground,
-    kColorId_TextfieldReadOnlyColor,
-    kColorId_TextfieldReadOnlyBackground,
-    kColorId_TextfieldSelectionColor,
-    kColorId_TextfieldSelectionBackgroundFocused,
-    // Tooltip
-    kColorId_TooltipBackground,
-    kColorId_TooltipText,
-    // Tree
-    kColorId_TreeBackground,
-    kColorId_TreeText,
-    kColorId_TreeSelectedText,
-    kColorId_TreeSelectedTextUnfocused,
-    kColorId_TreeSelectionBackgroundFocused,
-    kColorId_TreeSelectionBackgroundUnfocused,
-    kColorId_TreeArrow,
-    // Table
-    kColorId_TableBackground,
-    kColorId_TableText,
-    kColorId_TableSelectedText,
-    kColorId_TableSelectedTextUnfocused,
-    kColorId_TableSelectionBackgroundFocused,
-    kColorId_TableSelectionBackgroundUnfocused,
-    kColorId_TableGroupingIndicatorColor,
-    // Results Tables, such as the chrome omnibox.
-    kColorId_ResultsTableNormalBackground,
-    kColorId_ResultsTableHoveredBackground,
-    kColorId_ResultsTableSelectedBackground,
-    kColorId_ResultsTableNormalText,
-    kColorId_ResultsTableHoveredText,
-    kColorId_ResultsTableSelectedText,
-    kColorId_ResultsTableNormalDimmedText,
-    kColorId_ResultsTableHoveredDimmedText,
-    kColorId_ResultsTableSelectedDimmedText,
-    kColorId_ResultsTableNormalUrl,
-    kColorId_ResultsTableHoveredUrl,
-    kColorId_ResultsTableSelectedUrl,
-    kColorId_ResultsTableNormalDivider,
-    kColorId_ResultsTableHoveredDivider,
-    kColorId_ResultsTableSelectedDivider,
-    // TODO(benrg): move other hardcoded colors here.
-
-    kColorId_NumColors,
-  };
-
-  // Return a color from the system theme.
-  virtual SkColor GetSystemColor(ColorId color_id) const = 0;
-
-  // Returns a shared instance of the native theme.
-  // The returned object should not be deleted by the caller.  This function
-  // is not thread safe and should only be called from the UI thread.
-  // Each port of NativeTheme should provide its own implementation of this
-  // function, returning the port's subclass.
-  static NativeTheme* instance();
-
-  // Add or remove observers to be notified when the native theme changes.
-  void AddObserver(NativeThemeObserver* observer);
-  void RemoveObserver(NativeThemeObserver* observer);
-
-  // Notify observers of native theme changes.
-  void NotifyObservers();
-
- protected:
-  NativeTheme();
-  virtual ~NativeTheme();
-
-  unsigned int thumb_inactive_color_;
-  unsigned int thumb_active_color_;
-  unsigned int track_color_;
-
- private:
-  // Observers to notify when the native theme changes.
-  ObserverList<NativeThemeObserver> native_theme_observers_;
-
-  DISALLOW_COPY_AND_ASSIGN(NativeTheme);
-};
-
-}  // namespace ui
-
-#endif  // UI_NATIVE_THEME_NATIVE_THEME_H_