/usr/include/Nux-4.0/Nux/WidgetMetrics.h is in libnux-4.0-dev 4.0.8+16.04.20160209-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82  | /*
 * Copyright 2010 Inalogic® Inc.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License, as
 * published by the  Free Software Foundation; either version 2.1 or 3.0
 * of the License.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranties of
 * MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the applicable version of the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of both the GNU Lesser General Public
 * License along with this program. If not, see <http://www.gnu.org/licenses/>
 *
 * Authored by: Jay Taoko <jaytaoko@inalogic.com>
 *
 */
#ifndef WIDGETMETRICS_H
#define WIDGETMETRICS_H
namespace nux
{
  extern const Color COLOR_BLACK ;
  extern const Color COLOR_RED;
  extern const Color COLOR_GREEN;;
  extern const Color COLOR_BLUE;
  extern const Color COLOR_WHITE;
  extern const Color COLOR_BACKGROUND_PRIMARY;
  extern const Color COLOR_BACKGROUND_SECONDARY;
  extern const Color COLOR_FOREGROUND_PRIMARY;
  extern const Color COLOR_FOREGROUND_SECONDARY;
  extern const Color COLOR_SELECTION_SECONDARY;
// Text color
  extern const Color COLOR_TEXTEDIT_BACKGROUNG;
  extern const Color COLOR_TEXTSTATIC_BACKGROUNG;
// General background color
  extern const Color  COLOR_WIDGET_BACKGROUND;
  extern const Color  COLOR_WIDGET_MOUSEOVER;
  extern const Color  COLOR_WINDOW_BACKGROUND;
// Widget control background color
  extern const Color  COLOR_PRIMARY_LEFT;
  extern const Color  COLOR_PRIMARY_RIGHT;
// ScrollBar color
  extern const Color COLOR_SCROLLBAR_TRACK;
  extern const Color COLOR_SCROLLBAR_SLIDER;
  extern const Color COLOR_DARK_0;
  extern const Color COLOR_LIGHT_0;
  extern const int   AREA_MIN_WIDTH;
  extern const int   AREA_MAX_WIDTH;
  extern const int   AREA_MIN_HEIGHT;
  extern const int   AREA_MAX_HEIGHT;
  extern const int   DEFAULT_WIDGET_HEIGHT;
  extern const int   PRACTICAL_WIDGET_HEIGHT;
  extern const int   DEFAULT_WIDGET_WIDTH;
  extern const int   PRACTICAL_WIDGET_WIDTH;
  extern const int   DEFAULT_TEXT_X_MARGIN;
  extern const int   DEFAULT_TEXT_Y_MARGIN;
  extern const float DEFAULT_REPEAT_DELAY;
}
#endif // WIDGETMETRICS_H
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