ui/native_theme/native_theme.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_NATIVE_THEME_NATIVE_THEME_H_
   6 #define UI_NATIVE_THEME_NATIVE_THEME_H_
   7
   8 #include "base/observer_list.h"
   9 #include "third_party/skia/include/core/SkColor.h"
  10 #include "ui/gfx/native_widget_types.h"
  11 #include "ui/native_theme/native_theme_export.h"
  12
  13 class SkCanvas;
  14
  15 namespace gfx {
  16 class Rect;
  17 class Size;
  18 }
  19
  20 namespace ui {
  21
  22 class NativeThemeObserver;
  23
  24 // This class supports drawing UI controls (like buttons, text fields, lists,
  25 // comboboxes, etc) that look like the native UI controls of the underlying
  26 // platform, such as Windows or Linux. It also supplies default colors for
  27 // dialog box backgrounds, etc., which are obtained from the system theme where
  28 // possible.
  29 //
  30 // The supported control types are listed in the Part enum.  These parts can be
  31 // in any state given by the State enum, where the actual definition of the
  32 // state is part-specific. The supported colors are listed in the ColorId enum.
  33 //
  34 // Some parts require more information than simply the state in order to be
  35 // drawn correctly, and this information is given to the Paint() method via the
  36 // ExtraParams union.  Each part that requires more information has its own
  37 // field in the union.
  38 //
  39 // NativeTheme also supports getting the default size of a given part with
  40 // the GetPartSize() method.
  41 class NATIVE_THEME_EXPORT NativeTheme {
  42  public:
  43   // The part to be painted / sized.
  44   enum Part {
  45     kComboboxArrow,
  46     kCheckbox,
  47     kInnerSpinButton,
  48     kMenuList,
  49     kMenuCheck,
  50     kMenuCheckBackground,
  51     kMenuPopupArrow,
  52     kMenuPopupBackground,
  53     kMenuPopupGutter,
  54     kMenuPopupSeparator,
  55     kMenuItemBackground,
  56     kProgressBar,
  57     kPushButton,
  58     kRadio,
  59
  60     // The order of the arrow enums is important, do not change without also
  61     // changing the code in platform implementations.
  62     kScrollbarDownArrow,
  63     kScrollbarLeftArrow,
  64     kScrollbarRightArrow,
  65     kScrollbarUpArrow,
  66
  67     kScrollbarHorizontalThumb,
  68     kScrollbarVerticalThumb,
  69     kScrollbarHorizontalTrack,
  70     kScrollbarVerticalTrack,
  71     kScrollbarHorizontalGripper,
  72     kScrollbarVerticalGripper,
  73     // The corner is drawn when there is both a horizontal and vertical
  74     // scrollbar.
  75     kScrollbarCorner,
  76     kSliderTrack,
  77     kSliderThumb,
  78     kTabPanelBackground,
  79     kTextField,
  80     kTrackbarThumb,
  81     kTrackbarTrack,
  82     kWindowResizeGripper,
  83     kMaxPart,
  84   };
  85
  86   // The state of the part.
  87   enum State {
  88     // IDs defined as specific values for use in arrays.
  89     kDisabled = 0,
  90     kHovered  = 1,
  91     kNormal   = 2,
  92     kPressed  = 3,
  93     kNumStates = kPressed + 1,
  94   };
  95
  96   // Each structure below holds extra information needed when painting a given
  97   // part.
  98
  99   struct ButtonExtraParams {
 100     bool checked;
 101     bool indeterminate;  // Whether the button state is indeterminate.
 102     bool is_default;  // Whether the button is default button.
 103     bool is_focused;
 104     bool has_border;
 105     int classic_state;  // Used on Windows when uxtheme is not available.
 106     SkColor background_color;
 107   };
 108
 109   struct InnerSpinButtonExtraParams {
 110     bool spin_up;
 111     bool read_only;
 112     int classic_state;  // Used on Windows when uxtheme is not available.
 113   };
 114
 115   struct MenuArrowExtraParams {
 116     bool pointing_right;
 117     // Used for the disabled state to indicate if the item is both disabled and
 118     // selected.
 119     bool is_selected;
 120   };
 121
 122   struct MenuCheckExtraParams {
 123     bool is_radio;
 124     // Used for the disabled state to indicate if the item is both disabled and
 125     // selected.
 126     bool is_selected;
 127   };
 128
 129   struct MenuItemExtraParams {
 130     bool is_selected;
 131   };
 132
 133   struct MenuListExtraParams {
 134     bool has_border;
 135     bool has_border_radius;
 136     int arrow_x;
 137     int arrow_y;
 138     SkColor background_color;
 139     int classic_state;  // Used on Windows when uxtheme is not available.
 140   };
 141
 142   struct MenuBackgroundExtraParams {
 143     int corner_radius;
 144   };
 145
 146   struct ProgressBarExtraParams {
 147     double animated_seconds;
 148     bool determinate;
 149     int value_rect_x;
 150     int value_rect_y;
 151     int value_rect_width;
 152     int value_rect_height;
 153   };
 154
 155   struct ScrollbarArrowExtraParams {
 156     bool is_hovering;
 157   };
 158
 159   struct ScrollbarTrackExtraParams {
 160     bool is_upper;
 161     int track_x;
 162     int track_y;
 163     int track_width;
 164     int track_height;
 165     int classic_state;  // Used on Windows when uxtheme is not available.
 166   };
 167
 168   struct ScrollbarThumbExtraParams {
 169     bool is_hovering;
 170   };
 171
 172   struct SliderExtraParams {
 173     bool vertical;
 174     bool in_drag;
 175   };
 176
 177   struct TextFieldExtraParams {
 178     bool is_text_area;
 179     bool is_listbox;
 180     SkColor background_color;
 181     bool is_read_only;
 182     bool is_focused;
 183     bool fill_content_area;
 184     bool draw_edges;
 185     int classic_state;  // Used on Windows when uxtheme is not available.
 186   };
 187
 188   struct TrackbarExtraParams {
 189     bool vertical;
 190     int classic_state;  // Used on Windows when uxtheme is not available.
 191   };
 192
 193   union ExtraParams {
 194     ButtonExtraParams button;
 195     InnerSpinButtonExtraParams inner_spin;
 196     MenuArrowExtraParams menu_arrow;
 197     MenuCheckExtraParams menu_check;
 198     MenuItemExtraParams menu_item;
 199     MenuListExtraParams menu_list;
 200     MenuBackgroundExtraParams menu_background;
 201     ProgressBarExtraParams progress_bar;
 202     ScrollbarArrowExtraParams scrollbar_arrow;
 203     ScrollbarTrackExtraParams scrollbar_track;
 204     ScrollbarThumbExtraParams scrollbar_thumb;
 205     SliderExtraParams slider;
 206     TextFieldExtraParams text_field;
 207     TrackbarExtraParams trackbar;
 208   };
 209
 210   // Return the size of the part.
 211   virtual gfx::Size GetPartSize(Part part,
 212                                 State state,
 213                                 const ExtraParams& extra) const = 0;
 214
 215   // Paint the part to the canvas.
 216   virtual void Paint(SkCanvas* canvas,
 217                      Part part,
 218                      State state,
 219                      const gfx::Rect& rect,
 220                      const ExtraParams& extra) const = 0;
 221
 222   // Paint part during state transition, used for overlay scrollbar state
 223   // transition animation.
 224   virtual void PaintStateTransition(SkCanvas* canvas,
 225                                     Part part,
 226                                     State startState,
 227                                     State endState,
 228                                     double progress,
 229                                     const gfx::Rect& rect) const { }
 230
 231   // Supports theme specific colors.
 232   void SetScrollbarColors(unsigned inactive_color,
 233                           unsigned active_color,
 234                           unsigned track_color);
 235
 236   // Colors for GetSystemColor().
 237   enum ColorId {
 238     // Windows
 239     kColorId_WindowBackground,
 240     // Dialogs
 241     kColorId_DialogBackground,
 242     // FocusableBorder
 243     kColorId_FocusedBorderColor,
 244     kColorId_UnfocusedBorderColor,
 245     // Button
 246     kColorId_ButtonBackgroundColor,
 247     kColorId_ButtonEnabledColor,
 248     kColorId_ButtonDisabledColor,
 249     kColorId_ButtonHighlightColor,
 250     kColorId_ButtonHoverColor,
 251     kColorId_ButtonHoverBackgroundColor,
 252     kColorId_BlueButtonEnabledColor,
 253     kColorId_BlueButtonDisabledColor,
 254     kColorId_BlueButtonPressedColor,
 255     kColorId_BlueButtonHoverColor,
 256     kColorId_BlueButtonShadowColor,
 257     // MenuItem
 258     kColorId_EnabledMenuItemForegroundColor,
 259     kColorId_DisabledMenuItemForegroundColor,
 260     kColorId_DisabledEmphasizedMenuItemForegroundColor,
 261     kColorId_SelectedMenuItemForegroundColor,
 262     kColorId_FocusedMenuItemBackgroundColor,
 263     kColorId_HoverMenuItemBackgroundColor,
 264     kColorId_MenuSeparatorColor,
 265     kColorId_MenuBackgroundColor,
 266     kColorId_MenuBorderColor,
 267     // MenuButton - buttons in wrench menu
 268     kColorId_EnabledMenuButtonBorderColor,
 269     kColorId_FocusedMenuButtonBorderColor,
 270     kColorId_HoverMenuButtonBorderColor,
 271     // Label
 272     kColorId_LabelEnabledColor,
 273     kColorId_LabelDisabledColor,
 274     kColorId_LabelBackgroundColor,
 275     // Link
 276     kColorId_LinkDisabled,
 277     kColorId_LinkEnabled,
 278     kColorId_LinkPressed,
 279     // Textfield
 280     kColorId_TextfieldDefaultColor,
 281     kColorId_TextfieldDefaultBackground,
 282     kColorId_TextfieldReadOnlyColor,
 283     kColorId_TextfieldReadOnlyBackground,
 284     kColorId_TextfieldSelectionColor,
 285     kColorId_TextfieldSelectionBackgroundFocused,
 286     // Tooltip
 287     kColorId_TooltipBackground,
 288     kColorId_TooltipText,
 289     // Tree
 290     kColorId_TreeBackground,
 291     kColorId_TreeText,
 292     kColorId_TreeSelectedText,
 293     kColorId_TreeSelectedTextUnfocused,
 294     kColorId_TreeSelectionBackgroundFocused,
 295     kColorId_TreeSelectionBackgroundUnfocused,
 296     kColorId_TreeArrow,
 297     // Table
 298     kColorId_TableBackground,
 299     kColorId_TableText,
 300     kColorId_TableSelectedText,
 301     kColorId_TableSelectedTextUnfocused,
 302     kColorId_TableSelectionBackgroundFocused,
 303     kColorId_TableSelectionBackgroundUnfocused,
 304     kColorId_TableGroupingIndicatorColor,
 305     // Results Tables, such as the omnibox.
 306     kColorId_ResultsTableNormalBackground,
 307     kColorId_ResultsTableHoveredBackground,
 308     kColorId_ResultsTableSelectedBackground,
 309     kColorId_ResultsTableNormalText,
 310     kColorId_ResultsTableHoveredText,
 311     kColorId_ResultsTableSelectedText,
 312     kColorId_ResultsTableNormalDimmedText,
 313     kColorId_ResultsTableHoveredDimmedText,
 314     kColorId_ResultsTableSelectedDimmedText,
 315     kColorId_ResultsTableNormalUrl,
 316     kColorId_ResultsTableHoveredUrl,
 317     kColorId_ResultsTableSelectedUrl,
 318     kColorId_ResultsTableNormalDivider,
 319     kColorId_ResultsTableHoveredDivider,
 320     kColorId_ResultsTableSelectedDivider,
 321     // Positive text refers to good (often rendered in green) text, such as the
 322     // stock value went up.
 323     kColorId_ResultsTablePositiveText,
 324     kColorId_ResultsTablePositiveHoveredText,
 325     kColorId_ResultsTablePositiveSelectedText,
 326     // Negative text refers to something alarming (often rendered in red), such
 327     // as the stock value went down.
 328     kColorId_ResultsTableNegativeText,
 329     kColorId_ResultsTableNegativeHoveredText,
 330     kColorId_ResultsTableNegativeSelectedText,
 331     // For MD icons.
 332     kColorId_Amber,
 333     kColorId_ChromeIconGrey,
 334     kColorId_GoogleBlue,
 335     // Colors for the material spinner (aka throbber).
 336     kColorId_ThrobberSpinningColor,
 337     kColorId_ThrobberWaitingColor,
 338     kColorId_ThrobberLightColor,
 339     // TODO(benrg): move other hardcoded colors here.
 340
 341     kColorId_NumColors,
 342   };
 343
 344   // Return a color from the system theme.
 345   virtual SkColor GetSystemColor(ColorId color_id) const = 0;
 346
 347   // Returns a shared instance of the native theme.
 348   // The returned object should not be deleted by the caller.  This function
 349   // is not thread safe and should only be called from the UI thread.
 350   // Each port of NativeTheme should provide its own implementation of this
 351   // function, returning the port's subclass.
 352   static NativeTheme* instance();
 353
 354   // Add or remove observers to be notified when the native theme changes.
 355   void AddObserver(NativeThemeObserver* observer);
 356   void RemoveObserver(NativeThemeObserver* observer);
 357
 358   // Notify observers of native theme changes.
 359   void NotifyObservers();
 360
 361  protected:
 362   NativeTheme();
 363   virtual ~NativeTheme();
 364
 365   unsigned int thumb_inactive_color_;
 366   unsigned int thumb_active_color_;
 367   unsigned int track_color_;
 368
 369  private:
 370   // Observers to notify when the native theme changes.
 371   base::ObserverList<NativeThemeObserver> native_theme_observers_;
 372
 373   DISALLOW_COPY_AND_ASSIGN(NativeTheme);
 374 };
 375
 376 }  // namespace ui
 377
 378 #endif  // UI_NATIVE_THEME_NATIVE_THEME_H_