QColorGroup(3qt)

NAME
QColorGroup - Group of widget colors

#include <qpalette.h>

  Public Members
QColorGroup ()
QColorGroup ( const QColor & foreground, const QColor & button, const QColor & light, const QColor & dark, const QColor & mid, const QColor & text, const QColor & base ) (obsolete)
QColorGroup ( const QBrush & foreground, const QBrush & button, const QBrush & light, const QBrush & dark, const QBrush & mid, const QBrush & text, const QBrush & bright_text, const QBrush & base, const QBrush & background )
QColorGroup ( const QColorGroup & )
~QColorGroup ()
enum ColorRole { Foreground, Button, Light, Midlight, Dark, Mid, Text, BrightText, ButtonText, Base, Background, Shadow, Highlight, HighlightedText, NColorRoles }
const QColor& color ( ColorRole ) const
const QBrush& brush ( ColorRole ) const
void setColor ( ColorRole, const QColor & )
void setBrush ( ColorRole, const QBrush & )
const QColor& foreground () const
const QColor& button () const
const QColor& light () const
const QColor& dark () const
const QColor& mid () const
const QColor& text () const
const QColor& base () const
const QColor& background () const
const QColor& midlight () const
const QColor& brightText () const
const QColor& buttonText () const
const QColor& shadow () const
const QColor& highlight () const
const QColor& highlightedText () const
bool operator== ( const QColorGroup & g ) const
bool operator!= ( const QColorGroup & g ) const

RELATED FUNCTION DOCUMENTATION
(Note that these are not member functions.)
QDataStream & operator<< (QDataStream & s, const QColorGroup & g)
QDataStream & operator>> (QDataStream & s, QColorGroup & g)

DESCRIPTION
The QColorGroup class contains a group of widget colors.

A color group contains a group of colors used by widgets for drawing themselves. Widgets should not use colors like "red" and "turqoise" but rather "foreground" and "base", where possible. The color roles are enumerated and defined in the ColorRole documentation.

The most common usage of QColorGroup is like this:

    QPainter p;
    ...
    p.setPen( colorGroup().foreground() );
    p.drawLine( ... )

See the ColorRole documentation below for more details on roles.

It's also possible to modify color groups or create them from scratch.

The color group class can be created using three different constructors, or by modifying one supplied by the system. The default constructor creates an all-black color group, which can then be modified using set functions. There are two functions that take long lists of arguments (slightly different lists - beware!). And there is the copy constructor.

We strongly recommend using a system-supplied color group, and modifying that as necessary.

You modify a color group by calling the access functions setColor() and setBrush(), depending on whether you want a pure color or e.g. a pixmap pattern.

There are also corresponding color() and brush() getters, and a commonly used convenience function to get each ColorRole: background(), foreground(), base() and so on.

See also QColor, QPalette and QWidget::colorGroup().

  Member Type Documentation

QColorGroup::ColorRole
The ColorRole enum defines the different symbolic color roles used in current GUIs. The central roles are:

Background - general background color.

Foreground - general foreground color.

Base - used as background color for e.g. text entry widgets, usually white or another light color.

Text - the foreground color used with Base. Usually this is the same as the Foreground, in what case it must provide good contrast both with Background and Base.

Button - general button background color, where buttons need a background different from Background, as in the Macintosh style.

ButtonText - a foreground color used with the Button color.

    There are some color roles used mostly for 3D bevel and shadow effects:

Light - lighter than Button color.

Midlight - between Button and Light.

Dark - darker than Button.

Mid - between Button and Dark.

Shadow - a very dark color.

    All of these are normally derived from Background, and used in ways that depend on that relationship. For example, buttons depend on it to make the bevels look good, and Motif scroll bars depend on Mid to be slightly different from Background.

Selected (marked) items have two roles:

Highlight - a color to indicate a selected or highlighted item.

HighlightedText - a text color that contrasts to Highlight.

    Finally, there is a special role for text that needs to be drawn where Text or Foreground would provide bad contrast, such as on pressed push buttons:

BrightText - a text color that is very different from Foreground and contrasts well with e.g. Dark.

Note that text colors can be used for other things than just words: text colors are usually used for text, but it's quite common to have lines, icons and so on that belong with a text color logically.

This image shows most of the color roles in use:
[Image Omitted]

MEMBER FUNCTION DOCUMENTATION

QColorGroup::QColorGroup ()
Constructs a color group with all colors set to black.

QColorGroup::QColorGroup ( const QBrush & foreground, const QBrush & button, const QBrush & light, const QBrush & dark, const QBrush & mid, const QBrush & text, const QBrush & bright_text, const QBrush & base, const QBrush & background )
Constructs a color group. You can pass either brushes, pixmaps or plain colors for each parameter.

This constructor can be very handy sometimes, but don't overuse it: Such long lists of arguments are rather error-prone.

See also QBrush.

QColorGroup::QColorGroup ( const QColor & foreground, const QColor & background, const QColor & light, const QColor & dark, const QColor & mid, const QColor & text, const QColor & base )
This function is obsolete. It is provided to keep old source working, and will probably be removed in a future version of Qt. We strongly advise against using it in new code.

Constructs a color group with the specified colors. The button color will be set to the background color.

QColorGroup::QColorGroup ( const QColorGroup & other )
Constructs a color group that is an independent copy of other.

QColorGroup::~QColorGroup ()
Destructs the color group.

const QColor & QColorGroup::background () const
Returns the background color of the color group.

See also ColorRole.

const QColor & QColorGroup::base () const
Returns the base color of the color group.

See also ColorRole.

const QColor & QColorGroup::brightText () const
Returns the bright text foreground color of the color group.

See also ColorRole.

const QBrush & QColorGroup::brush ( ColorRole r ) const
Returns the brush that has been set for color role r.

See also color(), setBrush() and ColorRole.

const QColor & QColorGroup::button () const
Returns the button color of the color group.

See also ColorRole.

const QColor & QColorGroup::buttonText () const
Returns the button text foreground color of the color group.

See also ColorRole.

const QColor & QColorGroup::color ( ColorRole r ) const
Returns the color that has been set for color role r.

See also brush() and ColorRole.

const QColor & QColorGroup::dark () const
Returns the dark color of the color group.

See also ColorRole.

const QColor & QColorGroup::foreground () const
Returns the foreground color of the color group.

See also ColorRole.

const QColor & QColorGroup::highlight () const
Returns the highlight color of the color group.

See also ColorRole.

const QColor & QColorGroup::highlightedText () const
Returns the highlighted text color of the color group.

See also ColorRole.

const QColor & QColorGroup::light () const
Returns the light color of the color group.

See also ColorRole.

const QColor & QColorGroup::mid () const
Returns the medium color of the color group.

See also ColorRole.

const QColor& QColorGroup::midlight () const
Returns the midlight color of the color group.

See also ColorRole.

bool QColorGroup::operator!= ( const QColorGroup & g ) const
Returns TRUE if this color group is different from g, or FALSE if it is equal to g.

See also operator!=().

bool QColorGroup::operator== ( const QColorGroup & g ) const
Returns TRUE if this color group is equal to g, or FALSE if it is different from g.

See also operator==().

void QColorGroup::setBrush ( ColorRole r, const QBrush & b )
Sets the brush used for color role r to b.

See also brush(), setColor() and ColorRole.

void QColorGroup::setColor ( ColorRole r, const QColor & c )
Sets the brush used for color role r to a solid color c.

See also brush(), setColor() and ColorRole.

const QColor & QColorGroup::shadow () const
Returns the shadow color of the color group.

See also ColorRole.

const QColor & QColorGroup::text () const
Returns the text foreground color of the color group.

See also ColorRole.

RELATED FUNCTION DOCUMENTATION

QDataStream & operator<< (QDataStream & s, const QColorGroup & g)
Writes a color group to the stream.

See also Format of the QDataStream operators

QDataStream & operator>> (QDataStream & s, QColorGroup & g)
Reads a color group from the stream.

See also Format of the QDataStream operators

SEE ALSO
http://doc.trolltech.com/qcolorgroup.html http://www.trolltech.com/faq/tech.html

COPYRIGHT
Copyright 1992-2001 Trolltech AS, http://www.trolltech.com. See the license file included in the distribution for a complete license statement.

AUTHOR
Generated automatically from the source code.

BUGS
If you find a bug in Qt, please report it as described in http://doc.trolltech.com/bughowto.html. Good bug reports make our job much simpler. Thank you.

In case of content or formattting problems with this manual page, please report them to qt-bugs@trolltech.com. Please include the name of the manual page (qcolorgroup.3) and the Qt version (2.3.2).