gui: individually configurable styles of the editor lexers * color-picker.cc/.h: new class for a simple color picker * libgui/src/module.mk: added color-picker.cc/.h * file-editor-tab.cc(update_lexer): read config of the lexer from settings file * file-editor-tab(notice_settings): editor font not directly configured from the settings file but via the lexer settings in update_lexer * lexer-octave-gui.cc(constructor): inherits from QsciLexerOctave instaead of QsciLexer, code cleanup * lexer-octave-gui.cc(language,lexer,defaultFont,defaultColor,description): removed, original methods used and configured via settings * lexer-octave-gui.h: removed functions language,lexer,defaultFont,defaultColor, description and enum; using methods of octave lexer instead * settings-dialog.cc(constructor): editor font not configured from settings, defining lexers for supported languages and reading their actual settings from the settings file (via read_lexer_settings) * settings-dialog.cc(read_lexer_settings): new function for reading the lexers settings from settings file and creating the tabs with interactive elements for configuring these settings * settings-dialog.cc(write_changed_settings): remove settings for editor font, defining lexers for supported languages and writing the settings from the dialog into the settings file (via write_lexer_settings) * settings-dialog.cc(write_lexer_settings): new funciton for getting the new lexer settings from the interactive elements and write them into the settings file * settings-dialog.h: new functiond read_lexer_settings, write_lexer_settings * settings-dialog.ui: new tab for the editor styles which contents is dynamically created in settings_dialog ()

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgui/src/color-picker.h	Sun Mar 31 23:56:11 2013 +0200
@@ -0,0 +1,47 @@
+//
+// This class provides a simple color picker based on tQColorButton
+// by Harald Jedele, 23.03.01, GPL version 2 or any later version.
+//
+// Copyright (C) FZI Forschungszentrum Informatik Karlsruhe
+// Copyright (C) 2013 Torsten <ttl@justmail.de>
+//
+// This file is part of Octave.
+//
+// Octave is free software; you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3 of the License, or (at your
+// option) any later version.
+//
+// Octave is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Octave; see the file COPYING.  If not, see
+// <http://www.gnu.org/licenses/>.
+//
+
+#ifndef COLORPICKER_H
+#define COLORPICKER_H
+
+#include <QPushButton>
+#include <QColorDialog>
+
+class color_picker: public QPushButton
+{
+  Q_OBJECT
+
+public:
+  color_picker (QColor color = QColor(0,0,0), QWidget *parent = 0);
+  QColor color () const { return _color; }
+
+private slots:
+  void select_color ();
+
+private:
+  virtual void update_button ();
+  QColor _color;
+};
+
+#endif