qcolorgroup.3qt

linux下GUI编程工具qt的在线连接帮助手册

'\" t
.TH QColorGroup 3qt "11 October 2001" "Trolltech AS" \" -*- nroff -*-
.\" Copyright 1992-2001 Trolltech AS.  All rights reserved.  See the
.\" license file included in the distribution for a complete license
.\" statement.
.\"
.ad l
.nh
.SH NAME
QColorGroup \- Group of widget colors
.PP
\fC#include <qpalette.h>\fR
.PP
.SS "Public Members"
.in +1c
.ti -1c
.BI "\fBQColorGroup\fR ()"
.br
.ti -1c
.BI "QColorGroup ( const QColor & foreground, const QColor & background, const QColor & light, const QColor & dark, const QColor & mid, const QColor & text, const QColor & base )  \fI(obsolete)\fR"
.br
.ti -1c
.BI "\fBQColorGroup\fR ( 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 )"
.br
.ti -1c
.BI "\fBQColorGroup\fR ( const QColorGroup & other )"
.br
.ti -1c
.BI "\fB~QColorGroup\fR ()"
.br
.ti -1c
.BI "QColorGroup & \fBoperator=\fR ( const QColorGroup & other )"
.br
.ti -1c
.BI "enum \fBColorRole\fR { Foreground, Button, Light, Midlight, Dark, Mid, Text, BrightText, ButtonText, Base, Background, Shadow, Highlight, HighlightedText, Link, LinkVisited, NColorRoles }"
.br
.ti -1c
.BI "const QColor & \fBcolor\fR ( ColorRole r ) const"
.br
.ti -1c
.BI "const QBrush & \fBbrush\fR ( ColorRole r ) const"
.br
.ti -1c
.BI "void \fBsetColor\fR ( ColorRole r, const QColor & c )"
.br
.ti -1c
.BI "void \fBsetBrush\fR ( ColorRole r, const QBrush & b )"
.br
.ti -1c
.BI "const QColor & \fBforeground\fR () const"
.br
.ti -1c
.BI "const QColor & \fBbutton\fR () const"
.br
.ti -1c
.BI "const QColor & \fBlight\fR () const"
.br
.ti -1c
.BI "const QColor & \fBdark\fR () const"
.br
.ti -1c
.BI "const QColor & \fBmid\fR () const"
.br
.ti -1c
.BI "const QColor & \fBtext\fR () const"
.br
.ti -1c
.BI "const QColor & \fBbase\fR () const"
.br
.ti -1c
.BI "const QColor & \fBbackground\fR () const"
.br
.ti -1c
.BI "const QColor & \fBmidlight\fR () const"
.br
.ti -1c
.BI "const QColor & \fBbrightText\fR () const"
.br
.ti -1c
.BI "const QColor & \fBbuttonText\fR () const"
.br
.ti -1c
.BI "const QColor & \fBshadow\fR () const"
.br
.ti -1c
.BI "const QColor & \fBhighlight\fR () const"
.br
.ti -1c
.BI "const QColor & \fBhighlightedText\fR () const"
.br
.ti -1c
.BI "const QColor & \fBlink\fR () const"
.br
.ti -1c
.BI "const QColor & \fBlinkVisited\fR () const"
.br
.ti -1c
.BI "bool \fBoperator==\fR ( const QColorGroup & g ) const"
.br
.ti -1c
.BI "bool \fBoperator!=\fR ( const QColorGroup & g ) const"
.br
.in -1c
.SH RELATED FUNCTION DOCUMENTATION
.in +1c
.ti -1c
.BI "QDataStream & \fBoperator<<\fR ( QDataStream & s, const QColorGroup & g )"
.br
.in -1c
.SH DESCRIPTION
The QColorGroup class contains a group of widget colors.
.PP
A color group contains a group of colors used by widgets for drawing themselves. We recommend that widgets use color group roles such as" foreground" and "base" rather than literal colors like "red" or" turqoise". The color roles are enumerated and defined in the ColorRole documentation.
.PP
The most common use of QColorGroup is like this:
.PP
.nf
.br
    QPainter p;
.br
    ...
.br
    p.setPen( colorGroup().foreground() );
.br
    p.drawLine( ... )
.br
.fi
.PP
See the ColorRole documentation below for more details on roles.
.PP
It is also possible to modify color groups or create new color groups from scratch.
.PP
The color group class can be created using three different constructors or by modifying one supplied by the Qt. 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.
.PP
We strongly recommend using a system-supplied color group and modifying that as necessary.
.PP
You modify a color group by calling the access functions setColor() and setBrush(), depending on whether you want a pure color or a pixmap pattern.
.PP
There are also corresponding color() and brush() getters, and a commonly used convenience function to get each ColorRole: background(), foreground(), base(), etc.
.PP
See also QColor, QPalette, QWidget::colorGroup, Widget Appearance and Style, Graphics Classes and Image Processing Classes.
.SS "Member Type Documentation"
.SH "QColorGroup::ColorRole"
The ColorRole enum defines the different symbolic color roles used in current GUIs. The central roles are as follow:
.TP
\fCQColorGroup::Background\fR - general background color.
.TP
\fCQColorGroup::Foreground\fR - general foreground color.
.TP
\fCQColorGroup::Base\fR - used as background color for text entry widgets, for example; usually white or another light color.
.TP
\fCQColorGroup::Text\fR - the foreground color used with Base. Usually this is the same as the Foreground, in which case it must provide good contrast with Background and Base.
.TP
\fCQColorGroup::Button\fR - general button background color in which buttons need a background different from Background, as in the Macintosh style.
.TP
\fCQColorGroup::ButtonText\fR - a foreground color used with the Button color.
.PP
There are some color roles used mostly for 3D bevel and shadow effects:
.TP
\fCQColorGroup::Light\fR - lighter than Button color.
.TP
\fCQColorGroup::Midlight\fR - between Button and Light.
.TP
\fCQColorGroup::Dark\fR - darker than Button.
.TP
\fCQColorGroup::Mid\fR - between Button and Dark.
.TP
\fCQColorGroup::Shadow\fR - a very dark color.
.PP
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 attractive, and Motif scroll bars depend on Mid to be slightly different from Background.
.PP
Selected (marked) items have two roles:
.TP
\fCQColorGroup::Highlight\fR - a color to indicate a selected or highlighted item.
.TP
\fCQColorGroup::HighlightedText\fR - a text color that contrasts with Highlight.
.PP
Finally, there is a special role for text that needs to be drawn where Text or Foreground would give poor contrast, such as on pressed push buttons:
.TP
\fCQColorGroup::BrightText\fR - a text color that is very different from Foreground and contrasts well with e.g. Dark.
.TP
\fCQColorGroup::Link\fR - a text color used for unvisited hyperlinks.
.TP
\fCQColorGroup::LinkVisited\fR - a text color used for already visited hyperlinks.
.TP
\fCQColorGroup::NColorRoles\fR - Internal.
.PP
Note that text colors can be used for things other than just words; text colors are \fIusually\fR used for text, but it's quite common to use the text color roles for lines, icons, etc.
.PP
This image shows most of the color roles in use:
.ce 1
.B "[Image Omitted]"
.PP
.SH MEMBER FUNCTION DOCUMENTATION
.SH "QColorGroup::QColorGroup ()"
Constructs a color group with all colors set to black.
.SH "QColorGroup::QColorGroup ( const QColor & foreground, const QColor & background, const QColor & light, const QColor & dark, const QColor & mid, const QColor & text, const QColor & base )"
\fBThis function is obsolete.\fR It is provided to keep old source working. We strongly advise against using it in new code.
.PP
Constructs a color group with the specified colors. The button color will be set to the background color.
.SH "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 \fIforeground\fR, \fIbutton\fR, \fIlight\fR, \fIdark\fR, \fImid\fR, \fItext\fR, \fIbright_text\fR, \fIbase\fR and \fIbackground\fR.
.PP
This constructor can be very handy sometimes, but don't overuse it: such long lists of arguments are rather error-prone.
.PP
See also QBrush.
.SH "QColorGroup::QColorGroup ( const QColorGroup & other )"
Constructs a color group that is an independent copy of \fIother\fR.
.SH "QColorGroup::~QColorGroup ()"
Destroys the color group.
.SH "const QColor & QColorGroup::background () const"
Returns the background color of the color group.
.PP
See also ColorRole.
.SH "const QColor & QColorGroup::base () const"
Returns the base color of the color group.
.PP
See also ColorRole.
.SH "const QColor & QColorGroup::brightText () const"
Returns the bright text foreground color of the color group.
.PP
See also ColorRole.
.PP
Examples:
.)l themes/metal.cpp and themes/wood.cpp.
.SH "const QBrush & QColorGroup::brush ( ColorRole r ) const"
Returns the brush that has been set for color role \fIr\fR.
.PP
See also color(), setBrush() and ColorRole.
.PP
Examples:
.)l themes/metal.cpp and themes/wood.cpp.
.SH "const QColor & QColorGroup::button () const"
Returns the button color of the color group.
.PP
See also ColorRole.
.PP
Examples:
.)l themes/metal.cpp and themes/wood.cpp.
.SH "const QColor & QColorGroup::buttonText () const"
Returns the button text foreground color of the color group.
.PP
See also ColorRole.
.PP
Examples:
.)l themes/metal.cpp and themes/wood.cpp.
.SH "const QColor & QColorGroup::color ( ColorRole r ) const"
Returns the color that has been set for color role \fIr\fR.
.PP
See also brush() and ColorRole.
.SH "const QColor & QColorGroup::dark () const"
Returns the dark color of the color group.
.PP
See also ColorRole.
.PP
Example: themes/wood.cpp.
.SH "const QColor & QColorGroup::foreground () const"
Returns the foreground color of the color group.
.PP
See also ColorRole.
.PP
Examples:
.)l themes/metal.cpp and themes/wood.cpp.
.SH "const QColor & QColorGroup::highlight () const"
Returns the highlight color of the color group.
.PP
See also ColorRole.
.SH "const QColor & QColorGroup::highlightedText () const"
Returns the highlighted text color of the color group.
.PP
See also ColorRole.
.SH "const QColor & QColorGroup::light () const"
Returns the light color of the color group.
.PP
See also ColorRole.
.PP
Example: themes/wood.cpp.
.SH "const QColor & QColorGroup::link () const"
Returns the unvisited link text color of the color group.
.PP
See also ColorRole.
.SH "const QColor & QColorGroup::linkVisited () const"
Returns the visited link text color of the color group.
.PP
See also ColorRole.
.SH "const QColor & QColorGroup::mid () const"
Returns the mid color of the color group.
.PP
See also ColorRole.
.PP
Examples:
.)l themes/metal.cpp and themes/wood.cpp.
.SH "const QColor & QColorGroup::midlight () const"
Returns the midlight color of the color group.
.PP
See also ColorRole.
.SH "bool QColorGroup::operator!= ( const QColorGroup & g ) const"
Returns TRUE if this color group is different from \fIg\fR; otherwise returns FALSE.
.PP
See also
.SH "QColorGroup & QColorGroup::operator= ( const QColorGroup & other )"
Copies the colors of \fIother\fR to this color group.
.SH "bool QColorGroup::operator== ( const QColorGroup & g ) const"
Returns TRUE if this color group is equal to \fIg\fR; otherwise returns FALSE.
.PP
See also
.SH "void QColorGroup::setBrush ( ColorRole r, const QBrush & b )"
Sets the brush used for color role \fIr\fR to \fIb\fR.
.PP
See also brush(), setColor() and ColorRole.
.PP
Example: themes/wood.cpp.
.SH "void QColorGroup::setColor ( ColorRole r, const QColor & c )"
Sets the brush used for color role \fIr\fR to a solid color \fIc\fR.
.PP
See also brush() and ColorRole.
.PP
Examples:
.)l listviews/listviews.cpp and themes/metal.cpp.
.SH "const QColor & QColorGroup::shadow () const"
Returns the shadow color of the color group.
.PP
See also ColorRole.
.SH "const QColor & QColorGroup::text () const"
Returns the text foreground color of the color group.
.PP
See also ColorRole.
.PP
Example: listviews/listviews.cpp.
.SH RELATED FUNCTION DOCUMENTATION
.SH "QDataStream & operator<< ( QDataStream & s, const QColorGroup & g )"
Writes color group, \fIg\fR to the stream \fIs\fR.
.PP
See also Format of the QDataStream operators.

.SH "SEE ALSO"
.BR http://doc.trolltech.com/qcolorgroup.html
.BR http://www.trolltech.com/faq/tech.html
.SH COPYRIGHT
Copyright 1992-2001 Trolltech AS, http://www.trolltech.com.  See the
license file included in the distribution for a complete license
statement.
.SH AUTHOR
Generated automatically from the source code.
.SH BUGS
If you find a bug in Qt, please report it as described in
.BR http://doc.trolltech.com/bughowto.html .
Good bug reports help us to help you. Thank you.
.P
The definitive Qt documentation is provided in HTML format; it is
located at $QTDIR/doc/html and can be read using Qt Assistant or with
a web browser. This man page is provided as a convenience for those
users who prefer man pages, although this format is not officially
supported by Trolltech. 
.P
If you find errors in this manual page, please report them to
.BR [e-mail] .
Please include the name of the manual page (qcolorgroup.3qt) and the Qt
version (3.0.0).